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Final Radiological Survey of General Atomics Bldg 35 (Test Tower Facility) for Release to Unrestricted Use
	ML20154D292
Person / Time
Site:	07000734
Issue date:	09/30/1998
From:	Finchum S, Gonzales L, Ramirez E; GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
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IABIE OF CONTENTS LI ST OF TABLES............................................................... iii l LIST OF FIGURES ..............................................................iv INTRODUCTION =............................................................... I j- = SITE DESCRIPTI ON............................................................ 1 m STORY OF US E.............................................................. 2 CRITERIA FOR RELEASE TO UNRESTRICTED USE................................ 2 L F-iiity Surraces.......................................................... 2 Soil Release Criteria....................................................... 3 IN STRUM ENTATION.......................................................... 3 BACKGROUND MEASUREMENTS............................................... 3 Exposure Rate Backgrounds ................................................4 { Soil Background Levels.................................................... 4 ' DECONTAMINATION.......................................................... 4 4 Characterization Survey.................................................... 4 i-Areas Requiring Decontamination............................................ 5 Decontamination Plan...................................................... 6 Decontamination Procedures................................................. 6 SURVEYS PERFO RM ED...................................................... 7 Surveys Inside Building 35 (suspect affected areas).............................. 8 Surveys Inside Building 35 (non-suspect affected areas) ..........................8 Surveys Outside Building 35 including the roof (unaffected area)................... 8 Surveys Inside the Mechanical Shop (unaffected area)............................ 8 RESULTS OF THE SURVEY MEASUREMENTS..................................... 9 Results After Decontamination in Previously Elevated Areas ......................9 Scanning Inside the Facility................................................. 9 Fixed Measurements Inside the Facility....................................... 10 Removable Contamination Surveys inside the Facility........................... 10 Exposure Rate Measurements Inside the Facility............................... 10 Inaccessible Locations.................................................... 10 . Surveys Outside the Building............................................... 10 GA INTERNAL CONFIRMATORY SURVEY....................................... I 1 CONCLU SION............................................................... 1 1 Characterization Final Report.............................................. Appendix A 11 i l I _a

(. URT OF TABIJR Table 1: State of CA's Acceptable Surface Contamination Levels................... 12 Table 2: List ofInstruments for Building 35.................................... 13 Table 3: Background Measurements.......................................... 15 Table 4: Survey Results for Building 35 (Test Tower)............................. 16 [ Table 5: Soil Sample Results for Building 35 (Test Tower)....................... 23 [ [ [ { { [- {- { { ~ iii I L r

l l LIST OF FIGURES (figures not nage-1) Figure IA: General Atomics Site Figure 1 B: Drawing of Building 35 (Test Tower Facility) Figures 2-35: Characterization Survey Figure 36: Ground Floor -Initial Scan Figure 37: Ground Floor - Initial Detailed Scan Results Figure 38: Ground Floor - Initial IIand-held Fixed Measurements Figure 39: Ground Floor - Post Decontamination Results Figure 40: Ground Floor - Final Removable Contamination and Fixed Measurements Results Figure 41: Mechanical Shop - Removable Contamination Survey ( Figure 42: Ground Level - Wall Scan & Exposure Rate Measurements Figure 43: Ground Level Trough -Initial Survey Figure 44: Ground Level Trough - Surveys during Concrete Removal Figure 45: Ground Level Trough - During Remediation Figure 46: Ground Level Trough - During Remediation Figure 47: Ground Level Trough - During Remediation Figure 48: Ground Level Trough - During Remediation Figure 49: Ground Level Trough - Final Survey Figure 50: 9' Level - p Scan and Fixed Measurement Results on the Floor f Figure 51: 9' Level-Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 52: 17' Level-Scan Results on the Floor & Walls Figure 53: 17' Level-Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 54: 26' Level - p Scan Results on the Floor & Walls Figure 55: 26' Level-Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 56: 34' Level - Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 57: 42' Level-Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 58: 50' Level - Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 59: 52' Level-Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 60: 63' Level (West side)- Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 61: 63' Level (East side)- Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 62: 75' Level (East side) - Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 63: 80' Level (East side)- Fixed, Removable Cuntamination & Exposure Rate Measurement (s) Figure 64: North Wall-Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 65: South Wall - Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 66: East Wall-Scan & Fixed Measurement (s) Figure 67: West Wall-Scan & Fixed Measurement (s) Figure 68: East Tower (North Wall)- Scan Results Figure 69: East Tower (South Wel!)- Not Accessible Figure 70: East Tower (East Wall)- Scan, Fixed & Removable Contamination Figure 71: East Tower (West Wall)- Scan, Fixed & Removable Contamination i iV

LIST OF FIGURES (Continued) Figure 72: West Tower (North Wall) Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 73: West Tower (South Wall)-Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 74: West Tower (East Wall) Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) Figure 75: West Tower (West Wall) - Not Accessible for Scanning Figure 76: Outside, South Metal Wall - Scan Results Figure 77: Background Measurements Outside of Buildin 135-1 (Shipping & Receiving) Figure 78: Fixed Measurements on the Outside South Metal Wah (100cm Detector) 2 Figure 79: Fixed Measurements on the Outside South Mual Wall (15cm8 Detector) Figure 80: Fixed Measurements on the Outside Concrete Pad (base of the south wall) Figure 81: Fixed Measurements on the Outside Ground Surface (~2m from south wall) Figure 82: Removable Contamination Survey on the Outside South Metal Wall Figure 83: Exposure Rate Survey Outside the Building (South Side) Figure 84: Roof (Removable Contamination) Figure 85: Outside NW Corner Concrete Slab (Scan Results) Figure 86: Ground Level Confumatory Survey (Scan, Fixed & Removable Contamination) Figure 87: Ground Level Confirmatory Survey (Fixed Measurements) Figure 88: 9' Level Confumatory Survey (Scan, Fixed & Removable Contamination) l Figure 89: 17' Level Confirmatory Survey (Scan, Fixed & Removable Contamination) Figure 90: 26' Level Confumatory Survey (Scan, Fixed & Removable Contamination) Figure 91: 34' Level Confumatory Survey (Scan, Fixed & Removable Contamination) Figure 92: 42' Level Confumatory Survey (Scan, Fixed & Removable Contamination) l l v l l l r

INTRODUCTION General Atomics (GA) is continuing its efforts directed at decontaminating and obtaining the release to unrestricted use of selected laboratories and facilities on its San Diego site. GA has recently decontaminated and surveyed Building 35 (Test Tower Fr.cility) to demonstrate it meets the criteria for release to unrestricted use. These surveys include those done during Characterization of the facility, during and after decontamination, and Final Surveys. The results of the Characterization Survey (report provided in Appendix A) showed low levels of removable and fixed Cs-137 and Co-60 contamination or nay horizontal surfaces within the building (no contamination was detected in the work areas of the building). However, radiation levels were below the release criteria in all areas except the ground floor. Contamination on the ground floor was found inside a concrete trough located along the north wall of the main portion of the building and on several small areas of the concrete floor. Soil underneath the concrete trough was also found to be contaminated. Elevated residual radioactivity was also measured in small localized areas on the 17' level and the 20' level. All of these areas were decontaminated. In addition, GA made a reasonable effort to eliminate residual contamination from all accessible horizontal surfaces throughout the facility. Decontamination was accomplished by vacuuming and/or scraping debris or by using more aggressive decontamination techniques. This report documents the decontamination and the results of extensive and comprehensive measurements completed in Building 35 (Test Tower Facility) performed beginning March 1997 through January 1998 and demonstrates that the residual radioactive levels in this building meet the ) approved criteria for release to unrestricted use. GA is requesting the State of California release this building to unrestricted use. SITE DESCRIPTION The location of Building 35 (Test Tower Facility), with respect to other facilities on the GA Site, is shown in Figure I A. A drawing of Building 35 is provided in Figure 18. The total ground level floor area of the building to be released to unrestricted use is ~2561 ft2 comprised of the main portion of the building and a mechanical shop. The main portion of the buiVmg is ~69.5' long and ~28' wide (~1946 ft ) and the mechanical shop which is located in the 2 northeast corner of Building 35 is ~41' long by 15' wide (~615 ft ), 2 The main portion of Building 35 is constructed of concrete floor, corrugated metal walls, and metal 1 i

l stairs and mezzanines. This portion of the building stands ~ 60' tall with an East and West tower each extending beyond the ~60' level to ~85'(see Figure 1B). Metal stairs reach the 63' level on the West Tower and 42' level on the East Tower. Platforms on the East Tower's 63', 75' and 80' levels can be accessed using a permanent metal ladder. GA used scissors lifts and a boom lift for accessing many of the walls and other levels. IIISTORY OF USE Building 35 was used during the 1970's and 1980's for work involving radioactively contaminated helium circulators from the Fort St. Vrain nuclear reactor facility in Colorado. These circulators were retc.med to GA by Public Service Company of Colorado for repair and maintenance. Typically, tl e circulator would be brought into the building for storage and disassembly. Building 35 was the c nly building on site high enough to support the large circulators. The circulators were approximately 20 feet long and 5 feet in diameter. The upper end of the circulators included inlet vanes, a helium compressor, and outlet difruser blades. These contaminated components were enclosed in a sealed closure during shipment. Upon receipt at GA, the circulator was installed vertically in Building 35. The upper end was tented and the exhaust filtered through pre-filters and HEPA filters. The contaminated components were removed, bagged, and stored or transported to another facility for refurbishment. New or refurbished components were installed and the sealed closure re-ir. stalled prior to removal from the tented area. On October 14,1981, an event occurred which caused an airborne contamination incident inside the building. The event occurred when a machinist removed radioactively contaminated parts of the helium circulator from a plastic enclosure set up at the 17' level. A review of the Radiological Safety Condition Report written after the incident showed contamination in all levels of the building as a result of the event. The highest contamination levels (up to ~ 70,000 dpm/100 cm beta ) were 2 measured on the 26' level where the circulator parts had been stored. Contamination was detected on 2 as high as the 75' level (~400 dpm/100 cm beta). The contaminants were identified as Cs-137 and Co-60. Decontamination of accessible surfaces took several weeks to complete after the incident in 1981. CRITERIA FOR RELEASE TO UNRESTRICTED USE Based on the previous history of work conducted in the building and t..: results of the Characterization Surv9, the predominant radiological contaminants determined to be present were Cs-137 and Co-60. Guideline values for release to unrestricted use for these beta / gamma emit.ters are provided below: Facility Surfaces l Table 1," State of CA Acceptable Surface Contamination Levels"is taken from the State of ( Califomia's guidelines, "DilS Criteria for Release of Facilities and Equipment to Unrestricted Use," l 2 )

also known as "DECON-1," which has also been incorporated into GA's radioactive material license (#0145-37). Table I release criteria applies to items, equipment and facility surfaces. The limits which apply for Building 35 surfaces contaminated with Cs-137 and Co-60 are: 2 5,000 dpm/100 cm (averaged over i m) 2 2 15,000 dpm/100 cm (maximum in a 100 cm area if the average over 1 m is met) 1000 dpm/100 cm (removable contamination) 2 l Soil Release Criteria Only Cs-137 and Co-60 were detected in soil above normal background levels. GA's Decommissioning Plan, approved by the State of CA, specifies the limits for soil (which includes / asphalt and concrete rubble o. gravel) for Cs-137 and Co-60 as follows: Cs-137 15 pCi/g Co-60 8 pCi/g f If both radionuclides are present, the sum of the fractions cannot exceed 1. INSTRUMENTATION Table 2 is a list of the instruments used during the radiological surveys. The table includes: (1) a description of the instrument,(2) model and serial number 2 of rate meters and detectors,(3) I instrument ranges, (4) calibration due dates, (5) typical efficiencies, and (6) typical background count rates. Count-rate meters are calibrated semiannually. Dose-rate meters are calibrated quarterly. BACKGROUND MEASUREMENTS i Three difTerent material surfaces exist inside Building 35. These surfaces are made of concrete, metal, and wood. Building 13 was selected for conducting background measurements because there has never been radioactive material used in this building, the age of the building, and because the various surfaces found in Building 35 could also be found in Building 13. The nearby building 35-1 (outside surfaces) were also used for background measurements (to compare with outside surfaces at Building 35). For background fixed measurements provided in Table 3, the mean and standard deviation for each surface surveyed with the 100 cm detector was calculated using equations 8-11 and 8-12 in 2 NUREG/CR-5849 (Manual for Conducting Rtdiological Surveys in Support of License Termination, Draft for Comment, ORAU-92/C57, Oak Ridge Associated Universities, June 1992) as follows: 3 _ _ _ _ _ _ _ _ _ _a

. -. ~..-... l Equation (8-11) 7 gE"?,r, Equation (8-12) UE"# n -i I Background measurements and minimum detectable activities (MDA's) for each type of surface and for various counting times are provided in Table 3. Minimum detectable activities (MDA's) for each l type of surface were calculated using equation (5-2) from draft NUREG/CR-5849 as shown below: Equation (5-2) 2.71 +4.65/B,xt 2 MDA= (dpm/l00cm ) ^ txEx 100 Where: B = background rate (cpm) a t = count time (min) E = e Ticiency A = area of the detector (cm') Exposure Rate Backgrounds Typical exposure rate background for this site is about 15 pR/hr at I m from the surface; measured south of Building 15 (an office building). Mear.irements taken offsite in 10 different locations over a l period of a year also give an average of about 15 pR/hr (at 1 m from the surface). Normal background exposure rates increase to about 22 R/hr at I m from the surface in small rooms with concrete floors and walls. Soil Background Levels Typical soil background levels for soil near the GA site are provided in GA's Site Decommissioning Plan. For Cs-137, it is typical to see a concentration of ~ 0.21 pCilg in the soil. For Co-60, concentrations are much lower, if detected, and usually less than 0.05 pCi/g. Cs-137 and Co-60 were the contaminants in Building 35. Cs-137 or Co-60 background concentrations were not subtracted from soil sample results provided in Table 5. DECONTAMINATION l Characterization Survey A detailed Characterization Survey was performed beginning in March 1997 and a final report 4 I t l r

I documenting the survey was issued in September 1997 (the Characterization Survey Report is provided in Appendix A). In addition to scanning surfaces with floor monitors, the following samples / mea:urements were also collected. Smears Paint Debris Fixed R/hr Samples Samples Measurements Measurements / 625 25 17 216 37 Areas Reauiring Decontamination The results of the Characterization Survey showed low levels of removable and fixed Cs-137 and Co-60 contamination on many horizontal surfaces within the building. However, radiation levels were below the release criteria in all but one location on the ground floor. Contamination on the ground floor was found inside a concrete trough located along the north wall of the main portion of the building and on several small areas of the concrete floor. (During remediation, soil underneath the concrete wns also found to be contaminated). Elevated residual radioactivity was fot.nd in small localized areas on the 17' level and the 26' level. For this building, GA decontaminated all areas with radioactivity levels exceeding the following levels: > 3000 dpm/100 cm fixed contamination 2 2 > 600 dpm/100 cm removable contamination >10 pR/hr above background i The locations (#1-3 listed below) which had radioactivity levels exceeding these levels were categorized as " suspect affected areas". 1. The ground floor - Contamination exceeding the release criteria was found on the ground floor and inside a concrete trough located along the north wall of the Test Tower (see Figures 36-38 andFigures 43-48). The maximum direct radiation levels were up to ~39,411 dpm/100 cm, 2 maximum removable contamination level was ~ 4,395 dpm/100 cm. Elevated exposure rate 2 measurements in the concrete trough were initially ~ 30 R/hr on the surface (see Figure 43). These readings increased to 60 Pshr (surface measurement) during remediation (see Figure 44). 2. 17' level - Two " hot spots", ~ 100 cm each in area, were identified; the maximum reading was 2 1400 cpm with a GM counter (-42,000 dpm/100 cm ; see Table 4 and Figure 53). 2 3. 26' level - Two areas were identified. One " hot spot",- 50 cm in area, and one location, ~ 25 2 ft2; the maximum reading was 1000 cpm with a GM counter ( ~30,000 dpm/100 cm ); see 2 Table 4 and Figure 55). Although contamination was detected on other levels within the building, the levels were found to be 5 I l _s

l well below the release criteria, prior to any decontamination, including the 9' level where a small localized area (~100 cm ) was decontaminated; levels were ~1000 dpm/100 cm before 2 2 decontamination. These levels were categorized as "non-suspect affected areas". Note: GA still decontaminated (mainly by vacuuming) all accessible locations (including horizontal I-beams and all levels of the facility) in an efrort to remove all remaining residual radioactive contamination within the facility. The mechanical shop was categorized as an " unaffected area". No contamination was detected in this room. All outside areas were categorized as " unaffected areas". In particular, no contamination was detected on the outside south metal wall, the outside concrete pad south of the roll-up door or the north concrete pad. 1 Decontamination Plan A summary of the decontamination plan followed for Building 35 is provided below: 1) A radiological Work Authorization was issued for decontamination activities. 2) Radiation safety training was requird for all personnel involved in decontamination activities. 3) Two people were required to be present at all times during remediation work. This was also a requirement while working in towers or on the roof and with ladders, man-lins, boom-lins or other similar devices. Only trained personnel operated the high-reach equipment, such as boom-lins and the scissors lift. Fall protection devices were required when working in elevated areas. 4) A Radiation Work Permit was required for work involving use of ajack-hammer or other aggressive decontamination equipment. 5) Protective clothing used during decontamination activities consisted of disposable coveralls, gloves and booties. 6) Air sampling was required when remediation of the concrete trough was being conducted. Also, when grinding " hot spots" on the 9',17' and 26' levels. Decontamination Procedures Remediation of contaminated areas was accomplished in the following sequential process. 1) Vacuuming with IIEPA. 6

- _ -. - ~. - - - _ - - _. i 2) Wiping with a masslin cloth. 3) Scrubbing with metal brush. 4) Scabbling with needle gun or metal grinder. 5) Use ofjack-hammer and pneumatic chisel to remove contaminated concrete at ground level. Nalg: Ifelevated levels ofradioactivity remained after thefirst remediation step then l the next more aggressive step was taken. A masslin wipe was taken after steps 3 through 5 to checkfor removable contamination. In addition, Health Physics made an extensive efTort to eliminate residual radioactive contamination throughout the building. General decontamination was conducted on all accessible floors and horizontal wall surfices (I-beams and channel irons). All floor surfaces were swept and elevated horizontal surfaces vacuumed. Vacuuming was performed by using a HEPA filtered vacuum cleaner l to contain all dirt and debris. A boom-lift and scissor-lift was used to reach channel irons and I-beams in West and East Towers up to 80'. Stairs were also vacuumed and railings wiped down. SURVEYS PERFORMED Various survey plans were developed based on the previous history of the building, the radionuclides of concern, the various types of surfaces, the potential for contamination, the l classification of the area (suspect affected, non-suspect affected or unaffected) and the results of the characterization survey. The physical characteristics of the facility, especially the concerns about l-working at such heights (up to ~80'), were taken into account when preparing the survey plans. I The surveys (Characterization and Final) included scanning of the floor surfaces of most levels of I the building, collection and analyses (by gross alpha / beta counting) of smears from floors and walls, i collection and analyses (by gamma spectroscopy) of debris and paint samples, fixed measurements I on the floors of most levels and walls, exposure rate ( R/hr) measurements, and scanning of various surfaces using floor monitors. A summary of the number of smears, paint chip samples, debris l samples and fixed measurements completed is provided below: i Building 35 (Test Tower) Survey Summary Survey Smears Paint Debris Fixed R/hr Samples Samples Measurements Measurements taracterization 625 25 17 216 37 Final 314 186 33 GA Internal Confirmatory 28 36 Total 967 25 17 438 70 1 7 1 I

1 Surveys Inside Building 35 (susoect affected areas) Based on previous history 8 id Characterization Survey of Test Tower, the ground floor,17' level, and 26' level areas were classified as " suspect afTected areas". Measurements were taken approximately every 2 meters on the floor and lower walls (up to 2 meters). Measurements alternated between a direct one minute p count (using a model 2221 100 cm Ludlum detector) and a 2 2 100 cm smear (counted for gross a / p ). Grids were establish for the purpose of referencing location of measurements. Floors and lower walls (up to 2 m) were scanned 100% for beta contamination with a model 2221, 434 cm Ludlum detector. General area exposure rate 2 measurements were also taken on each level. See Table 4 andFigures 36-40 & 42-49 andFigures 52-55for survey information and Table 3for instrument data. Surveys Inside Building 35 (non-susoect affected areas) Approximately 50% of accessible floors on all other levels (including platforms) were scanned for beta contamination using a 434 cm Ludlum floor monitor. Direct beta readings and smears were 2 taken on the floors ~ 5 meters apart (evenly spaced). General area exposure rate measurements were taken on each level and platform. See Table 4 and Figures 50, 51, and 56-63. Approximately 50% of accessible walls were scanned for beta contamination. Direct beta readings and smears were taken ~ 5 meters apart on walls and beams that were not surveyed during the Characterization Survey. One exposure rate measurement was taken ~ every 10 meters on walls. See Figures 64-75. Surveys Outside Building 35 including the roof (unaffected area) The south outside wall and concrete / asphalt area located outside of the roll-up door were surveyed during the Characterization Survey. This wall and outside area had the highest potential for contamination. Direct beta readings were taken on the south wall 1 and 2 meters above the ground, ~ 3 meters apart. Direct beta readings were also taken on the asphalt ground surface and concrete pad outside the South Wall of the Test Tower. See Figures 76-83. The outside NW corner concrete pad was also scanned for beta contamination with 434 cm detector 2 (see Figure 85). Removable contamination smears were obtained ~ every 3 meters on the South Wall and on the roof between the two towers which was accessed by using a " boom lif1" vehicle to reach the 60' elevation level (see Figure 84). No contamination was detected outside the building. Exposure rate measurements ( R/hr) were at or near background levels. Surveys Inside Mechanical Shoo (unaffected area) Removable contamination smears were taken on floor, cabinet tops, and overhead fixtures ~ 2 8 i i

l l meters apart. See Figure 41. Scans, fixed measurements and exposure rate surveys were taken during the Characterization Survey (see Appendix A). No contamination was detected in the Mechanical Shop in any of these surveys. l RESULTS OF THE SURVEY MEASUREMENTS i l Table 4 provides the results of the scanning, fixed measurements, smears, and exposure rate measurements taken during remediation, post decontamination and final survey. Figures 36-92 provide the locations and, in some cases, the results of various measurements. Soil sample results are provided in Table 5. Results After Decontamination in Previousiv Elevated Areas 1 1. The ground floor - Extensive remediation (including removal of contaminated soil) was conducted on the ground floor level and continued until radiation levels were well below the l release criteria (see Table 4 and Figures 36-39 and 43-49). The maximum fixed measurement after decontamination was 1432 dpm/100 cm (see Table 4 andFigure 49). The maximum 2 removable contamination levels were 16 dpm/100 cm alpha and 17 dpm/100 cm beta (see 2 2 Table 4 andFigure 40). Exposure rate measurements decreased to 28 R/h measured on the surface inside the trough and at I m (see Table 4 and Figure 49). l Soil Remediation - After the concrete was removed from the trough, the soil below was l sampled and found to exceed the release criteria. Soil samples S-4 through S-17 were taken initially and during decontamination. The results are provided in Table 5. Contaminated soil ( (about 15 fP) was removed from an area about 44" long and 15" wide and up to 38" deep (see Figure 49). Final soil samples (S-18 through S-21) were then taken after remediation and each result was well below the release criteria for Cs-137 and Co-60 (see Table 5). 2. 17' level - all areas decontaminated to < 289 dpm/100 cm (see Table 4 and Figure 53). 2 l 3. 26' level - all areas decontaminated to < 289 dpm/100 cm (see Table 4 and Figure 55). 2 Scanning Inside the Facility Scanning was performed on each level using a floor monitor having a 434 cm gas-flow 2 proportional detector. The floors and the walls (up 2m at the ground level) received 100% coverage by scanning for beta contamination. The results of the scans are provided in Table 4 and in the respective figures for each location. Readings were at or near background levels after decontamination. 9 l l

Fixed Measurements Inside the Facility Fixed measurements were performed using a beta gas-flow proportional counter having a 100 cm2 detector. In locations which were inaccessible with a floor monitor and in locations with a small p surface area (for example, horizontal I-beams), a geiger counter having a ~15 cm pancake GM 2 L detector was used for the fixed measurements. The counting time for fixed measurements was one or 2 minutes. For fixed measurements, an appropriate background was determined for each type of surface and subtracted from the survey readings. The readings were converted to dpm/100 cm using 2 the efficiency of the detector (and the geometry of the detector, in the case of the GM counter). The results are provided in Table 4 and the approximate locations (and results) are shown in the corresponding figures. All results were < 1500 dpm/100 cm aner decontamination. 2 Removable Contamination Surveys Inside the Facility Removable contamination measurements (smears) were performed on all surfaces including the floors, walls, and overhead structures (lights and support beams). Smear surveys consisted of using a Whatman Filter Paper (4.7 cm dia.) and wiping an area of~100 cm. The smears were counted in 2 GA's Health Physics Laboratory using a Canberra 2404 alpha / beta counter. The results are provided in Table 4 and the locations shown in the corresponding figures. The maximum smear result (aner decontamination) was <50 dpm/100 cm alpha and <55 dpm/100 cm beta; well below the release 2 2 criteria. Exnosure Rate Measurements Inside the Facility Direct radiation exposure rate measurements taken at I m above the surface using a microR (mR) met-r were taken at various locations within the facility. The results are provided in Table 4 and shown in corresponding figures. The exposure rate ranged from 7-16 R/hr at I m from the surface aner decontamination on all levels within the facility. In the concrete trough levels measured as high as 28 R/hr aner decontamination due to measurements being taken inside a pit about 2.5' deep (normal background levels under these conditions). Inaccessible Locations A few inaccessible areas inside the building and the roof over the east and west towers could not be surveyed. Based on the results of the accessible areas inside the building which were surveyed, there is sound reason to conclude that the few areas which could not be surveyed also meet the release criteria. The roof between the towers (at the 60' level), which had the highest potential of any roof area being decontaminated, was surveyed and no contamination was det : ted. Since no contamination was found on the roof at the 60' level and no contamination was found outside the building, there is no reason to suspect that the inaccessible roof over the towers is contaminated. Surveys Outside the Building including the Roof The outside surveys (sce Figures "i-85) included surveying the south outside wall, the concrete / asphalt area outside on tne south side of the building, the north concrete pad (some of these surveys were done during the Characterization Survey) and the roof at the 60' level. The south wall 10

. ~ _ - - - - 1 L and the surrounding outside area had the highest potential for contamination because the helium I circulator was brought in through the roll-up door located on the south side of the building. Measumments included removable contamination surveys, fixed measurements and exposure rate l measurements. No contamination was detected outside ofBuilding 35. Soil samples S-1 through S-3 were taken outside the building (where the runoff from the trough would flow out of the building). Two samples were taken in each of the three locations at 0-6" and y 6"-12" depths. The results were well below the release criteria (see Table 5 and Figure 45). GA INTERNAL CONFIRMATORY SURVEY I GA conducted an internal Confirmatory Survey to ensure that results were indeed below the State of California release criteria. This survey was performed by Health Phy ics Technicians not assigned l to the Final Survey in accordance to a written survey plan. Surveys were performed as follows: .y Suspect Affected Areas: 100% p/y scan on all floor surfaces. Twelve (12) fixed measurements in 4. the decontaminated trough. Random fixed measurements (-every 5 meters) and smcars were taken on the floors of the ground,17', and 26' levels. Non-suspect Affected Areas: Random fixed measurements and removable contamination surveys (smears) were taken about every - every 5 meters in non-suspect afTected areas. Unaffected Areas: No surveys taken. Beta scans showed radiation levels at or near background levels. All fixed measurements and removable contamination survey results were well below the release criteria. The results and the locations of the surveys performed are provided in Table 4 and in Figures 86-92, CONCLUSION Final contamination and radiation surveys provided in this report for Building 35 (Test Tower Facility), demonstrate that the building and surrounding area meet the approved guidelines for release to unrestricted use. l' i 11 w-

Table 1: STATE OF CA ACCEPTABLE SURFACE CONTAMINATION LEVELS ' l Nuclides' Average **' Maximum d' Removable "' 6 6 2 r 2 (dpm/100cm ) (dpm/100cm > (dpm/100cm > U-nat,285U,2"U, & associated decay 5,000 15,000 1,000 products Transuranics, 2"Ra, 2"Ra, 2'*Th, 2"Th, 100 300 20 28'Pa, rrrAc, "I, '"I Th-nat, rs:Th, "Sr, rasRa, 224Ra, 2 'U, '"I, 1,000 3,000 200 mg, isti Beta / gamma emitters (nuclides with decay modes other than alpha emitsion or 5,000 15,000 1,000 spontaneous fission) except "Sr and other noted above Where surface contamination by both alpha-and beta / gamma-emitting nuclides exists, the limits a j established for alpha-and beta / gamma-emitting nuclides should apply independently, b As used in this table dpm (disintegrations per minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, an geometric factors associated with the instrumentation. c Measurements of average contaminant should not be averaged over more than 1 square meter. For objects of less surface area, the average should be derived for each such object. d The maximum contamination level applies to an area of not more than 100 cm. 2 e The amount of removable radioactive material per 100 cm of surface area should be determined by 8 wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an eppmpriate instrument of known efficiency. When removable contamination on objects of less surface area is determined, then pertinent levels should be reduced proportionally and the entire surface should be wiped. f The average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mrad /hr at 1 cm and 1.0 mrad /hr at 1 cm, respectively, measured through not more than 7 milligrams per square centimeter of total absorber. 1 Guidelines For Decontamination of Facilities and Equipment Prior to Release for Unrestricted Use or Termination of Licenses For byproduct, Source, or Special Nuclear Material, also known as "Decon-t" incorporated into GA's State of CA Radioactrve Materials License. { i 12 i i l l l l

_n + TABLE 2: ' LIST OF INSTRUMENTS FOR BUILDING 35 (TEST TOWER)' As of September 19,1998 ' RATERIETER DETECTOR RANGE (CPM) CAueRADON EFFCENCY BACKGROUND DESCRIPDON DUE DATE (cym) Lumum ' Ludlum Model43-37 gas Four Linear Ranges 1-8-98 5 = 20.3% Varies with surface AcSwe Probe Area = 434cm '. The detodor and ratameter a s comtzned and Model2221 r wv. 6 e (434 cm ') 0-500,000 & One Log en Sr-90 scanned. See mounted on a roll around cart. The Instrument features a stabc-flow system, quick SfN 73701 Beta detector 50 - 500,000 Table 4 connects, a portable gas botee and a means to adjust the height of the detector from S/N 083265 the floor for ophmumm' Ludlum Ludlum Model 43 88 Four knear ranges 4-27-98 0 = 31.68% Vanes with surface 100 cm' gas flow proporSonal counter. f Model2221 100 cm' pwv.ev,4 0- 500.000 & one 7-20-98 0 = 35.5% scanned. See S/N 84423 counter S/N 119444 tog 50 - 500.000 (probe repaired) en Sr-90 Table 4 Ludlum -- Ludlum Model 43-65 Four ranges 8-28-97 a = 21.2% 0 Achve Probe Area = 50 cm' Model12 - Alpha Scmnllator 0 -500,000 4n Th-230 SIN 91051 ZnS(Ag) S/N 94053 Ludlum - Ludium Modet 44-9 Four Ranges 4-15-C8 p=22.0% 0-120 Active Probe Area = 15 rsn' Mode!3 beta / gamma probe 0 -100,000 4n Sr-90 S/N 139tes SIN 145981 Used for beta / gamma surveyng Ludhsn Ludlum Model 44-9 Four Ranges 4-15-98 p=23.24% 0-120 Active Probe Area = 15 cm' Model 3 beta / gamma p'obe 0 -100.000 4n Sr-90 S/N 139180 SN 145973 Used for beta / gamma surveying Ludlum Lusum Model 44-9 Four Ranges 9-27-97 p=22.24% 0-120 Ac5ve Probe Area = 15 cm' w.... probe 0 -100.000 4n Sr-90 Model 3 w S/N 4688 Used for beta / gamma surveying Ludlum Ludlum Model 44-9 Four Ranges 5-20-98 p=23.06% 0-120 Aceve Probe Area = 15 cm' Model14A betaW probe 0 -100.000 en Sr-90 S/N 83842 S/N 290314 Used for beta /gamme surve/ing Ludlum Model. Ludium Model 44-40 Four Linear Ranges 7-9-98 p=21.39% 0-120 Active Probe Area = 15 cm' 2221 S/N 86327 - beta /v..... shielded 0- 500,000 & One Log 4n Sr-90 GM pancake probe 50- 500,000 Used tbr sunreying and for flued measurements (1 or 2 rninutes counts) in difficult s/n 067171 to reach olaces. 13

TABLE 2: ~ LIST OF INSTRUMENTS FOR BUILDINC 35 UEST TOWER) As of Septeenber'19, i998 ~ RATEIAETER DETECTOR RANGE (CPM) CAUBRATION EFFICIENCY BACMOROUND DESCRIPfl0N DUE DATE (cpm) Technn:al Eberime HP-260 Three Ranges 1-07-98 S=24 95% O-120 Active Probe Area = 15 cm' W TBM-GM beta /gamme 0-500.000 4n Sr-90 15 aln 79084 pancake detector Ludium Modet is RCA 8199 coupled to e Five Ranges 12-18-97 N/A 10-18 pR/hr 1 inch a 1 inch Nat (TI) sontlBator is rnounted intemeNy lacro-R Meter Nat (TI) Screator 0- 5 mR/hr Used Ibr initial sunroy on ground floor and for moseurme extemal dose rates on the S/N 87120 surface and at one meter. Ludium Model 19 RCA 6199 coupled to a Frve Ranges 12-15-97 N/A 10-18 pR/hr 1 inch x 1 inch Nel (TI) scinuestor is mounted intemalpy Muro-R Meter ' Nal(TI) Scintiltator 0- 5 mR/hr Used for inital survey on ground floor and for measuring extemal done rates on the ' S/N 101758 surface and at one meter. Canberra Gas Flow T,w6.; N/A Count smeers for -26 30 % a < 0.5 Low Level at S gas proportonal counang system Low Level ' Detector removat9e S < 2.0 atS Counter at 6 surface Moded 2404 contamnaton k 14 i

TABLE 3: - Background Measurements Obtained from Building'13 (As of 9/19/98) Manufacturer: Ludlum Modet 2221 Ratemeter Serial Number: 73701 Ludlum Probe: 434cm' p Modet 43-37 Floor Monitor Serial Number: 083265 Calibration Due Date: 01/06/98 Efficiency: 20.30 % Sr-90 4n l Surface Beta / Gamma Scan (Range in cpm) l i Concrete 1424-1520 l i Metal 633492 l Manufacturer: Ludlum Modet 2221 Ratemeter Serial Number: 84423 Ludlum Probe: 100cm2 D Modet 4348 Serial Number: 119444 Calibration Due Date: Efficiency: Calibration Factor 2.81 07/20/98 / 08/12/98 35.50 % Sr-90 4n Surface One minute

MDA (dpm/100cm')

Two minute * .MDA- ' (dpm/100cm') Concrete 502 *202 301 1011

24' 212 l

Metal 364 1 16: 289 655* 35' 171 (31.68% off) Wood 406i11 304 757

46; 184 (31.68% off) l Manufacturer Ludlum Modet 2221 Ratemeter Serial Number: 86327 Ludlum Probe: 15cm' shielded Modet 44-40 Serial Number: 067171 GMDy Calibration Due Date:

Efficiency: 21.40% Sr-90 4n Calibration Factor 4.67 07/09/98 Surface One minute * ~ MDA (dpm/100cm') Two minute

MDA (dpm/100cm') -

Concrete - 86 i 14 1432 163*84: 970 Metal .32*7 907 70118 650 Wood 47 t 12 1081 88

27 724
Average of ten (10) measurements i 1 standard deviation.

a i 15 l

Table 4: Survey Results For Building 35 (Test Tower Facility) ~ As of seiness ! ' F4== Locaties ' # of Fixed - Maximem -

of Fined

' Maximous . # of - Manimem. Semple Baseks - Espesure Race : Measurements : ' Result : Measurements - . Result Smears

1. Result -

' (seil/peist/ debris)'- Range (pR/hr) - (with 100 cm2 . dym/100 cm2) - (with 15 em2 (dpa/les em2): (dym/l.es em2) . e/p and er.y spec ? ( detector) ' - detector) 1B Drawing of Building 35 (Test Tower Facility) 36 Ground initial 100 % p scan on Ground Roor level (all concete surface) using a Ludima 2221 rue meter with a 434cm' detector (beta). Floor Measurments on concrete (in cross hatched area) ranged from -704 to - 6800 cpm 37 Ground Detailed p Scan results on Ground Roor Level (all concrete sur' ace) using a Ludlum 2221 rare meter with a 434cm' detector (beta). Floor Numbers are the approximate locations of elevated measwements Measurements on concrete ranged from -704 to -6800 cym. 38 Ground Direct Readings using hand-held GM counter a all elevned areas. All readmgs are prior to aggressive decontaminmion. NOOf Elevated areas measured 250 cpm - 1000 cpm 39 Ground 3 1082 i' Floor (Post Decca Swwy) 40 Ground 39 < 301 (MDA) 57 16 a and 17 $ Floor 41 Mechanical 30 < 10m and < lop Shop 42 Walls at 100 % $ Scan on inside walls,2 meters up, at Ground level (all metal surface) with a Ludlum 2221 rate meter with a 434cm' detector (beta). 10-16 pR/hr@ im Ground Mmmments on metal (in cross hatched area) ranged horn -510 to - 850 cpm GA Floor 43 Trough at Initial detailed swvey showed highest GM direct frisk readings of-1000 cpm (-28,562 dpm/100 cm') 8-30pR/hr@lm Ground Initial detailed survey showed highest inducct (removable) measurements of - 1000 cpm /100 cm'(-4,395 dpm/100 cm') Floor See Figure 15 in Appendix A and Figures 44-47 for more informauon 16 i

~ ' Table 4: Survey Resul'ts For Building 35 (Test Tower Facility)

As of SNW90 Leesties

of Fined.

. Maximum : - # etFixed ~ Maximum

er Maximum.

- Sample Results > Exposere Race ; Messarements ' ' Result Messerements Result. Smears Result ' (soil / paint / debris). Range (pR/hr) E (with 100 em2 (dym/100 em2): ' (witti 15 em2 - (dym/100 em2) (dym/les em2) m/p and er T spee-detector) detector) .- ca - c--s a-., 44 43 1he wm trough along the northeast wall area was contammated. The trough was cleaned by vacuuming and then aggressively decontaminated. Initial contaminatio to 39,411 dpm/100 un". During cleanup, soil samples S-4 through S-17 were collected at various depths (see figures 44-48). Soil sample results are provided in Table 5. Soil w depth of 37 at which point soil samples were below the release criteria (see Figure 49). The maximum exposure rate result was 60 pit!hr. Three soil samples (S-1 through S-3) were taken outside the building (where the runoff from the trough would flow out the building); all results were below the release criteria 49 Final Survey 10 All < 1432 Final Soil Samples S-18 through S-21 22-28pR/hr@lm Insa Trough See Tabic 5 26-28 i t/hr@ contact t t 50 9' Level 100 % p Scan on floors (All metal surface) using a Ludlum 2221 rate meter with a 434cm' detector (beta). Measurements on metal (in shaded area) ranged from -485 to - 804 cpm. Maximum of436 dpm/100cm after d~antammation 8 51 9' Level 7 < 289 (MDA) 4 < 10a and <100 52 17 Level 100 % p Scan on the floor (all metal surfaces) using a Ludium 2221 rate meter with a 434cm8 detector (beta). Measurements on metal (in shaded area) ranged from ~410 to - 715 cpm Initial smear survey was performed on 17' level. A total of 10 smears were taken. Maximum results are <10e and <10p. 53 17 Level 22 < 289(MDA) 2 <650(MDA) 18 < 12a and <100 SpR/hr@lm GA Two initial hot spots read 1000 cpm and 1400 cpm (-42,000 dpm/100 cm') before decontamination (< 650 dpm/100 cm'after decontamination). Initial smear survey was performed on 26' level. Total of 10 smears were taken. Maximum results are <40a and <250 54 26' Level 100 % p Scan on floors and walls,2 meters up (all metal surface) using a Ludium 2221 rate meter with a 434cm' detector Measurements on metal (in shaded area) ranged from -380 to - 720 cpm. 55 26' Level 19 < 289(MDA) 2 650 22 < 10e and <100 SpR/hr@lm GA Initial results showed 2 elevated areas requiring decontammation. levels were < 650 dpnV100 cm in both of these locations after decontammation. 2 56 34' Level 55 % $ Scan on floor (all metal surface) using a Ludlum 2221 rate meter with a 434cm' detector Measurements on metal (in shaded area) ranged from -460 to - 580 cpm. ) 4 < 289(MDA) 4 < 10a and <10D EnR/hr@lm GA 17

Table 4: Survey Results For Building 35 (Test Tower Facility) An or w1 wee neere ' . Locaties

ofFised -

Maximum

of Fixed Maximum
er

' Maximen Sample Reseks 8'=; - m Rate I ~ Result Messerements Result ~ Smears Result Messerements , seil/ paint / debris)- " Range (pRlhr) - ( (with 100 can2 (dpan/199 em2) (with 15 cm2 ~ (dpm/ ISO cm2) (d m/100em2) a/p and or y Spee P detector) detector) - na-c -s Am 57 42* Level 4 < 289(MDA) 3 < 10a and <10p 9pR/hr@lm GA 57 42' Level 50 % p Scan on floor (all metal saface) using a Ludlum 2221 rate meter with a 434cm' detector Measurements on metal (in shaded area) ranged from ~392 to - 508 cpm. 58 50' Level 3 < 289(MDA) 3 < 10a and <100 9 R/hr@lmGA 50 % p Scan on floor (all metal surface) wring a Ludlum 2221 rate meter with a 434cm' detector. Measurements on metal (in shaded area) ranged from -395 to - 585 cpm. 59 52' Level 3 < 289(MDA) 10 < 10s and <100 10pR/hr@lm GA 50 % p Scan on Door (all metal surface) using a Ludlum 222I rate meter with a 434cm' detector. Measurements on metal (in shaded area) ranged from ~465 to - 577 cpm. 60 63' Level 3 < 289(MDA) 3 < 10a and <100 8pR/hr@im GA West Side 50 % p Scan on Door (all metal surface) using a Ludlum 2221 rme meter with a 434cm' detector Measurements on metal (in shaded area) ranged from -425 to - 580 cpm. I 61 63* Level 4 < 304(MDA) 6 < 10a and <130 8pR/hr@lm GA East Side 50 % $ Scan on Door (all wood surface) using a Ludlum 2221 rate meter with a 434cm' detector Measurements on wood (in shaded area) ranged from ~385 to - 620 cpm. 62 75' Level 4 < 304(MDA) 5 < 10e and <100 SpR/hr@lm GA East 50 % p Scan on Door (a!! wood surface) using a Ludlum 2221 ra:e meter with a 434cm' detector. Measurements on wood (in shaded area) ranged from -383 to - 580 cpm. 63 80' Level 4 <907(MDA) 5 < 10m and <105 8gR/hr@lm GA East 18 _____.__-_]

Table 4: Survey Results For Building 35 (Test Tower Facility) As or snsiss. Figure Location '

of Fixed

. Maximum

of Flaed Maximum
of Maximum Sample Results Exposure Rate Measurements Result Measurements Result Smears Result (soil / paint / debris) -

Range (pR/hr) (with 100 cm2 (dpm/100 cm2) (with 15 cm2 (dpm/IO0 cm2) (dpatlee em2) a/p and er y Spee detector) detector) GA = Gened Am 64 North Wall 7 < 907(MDA) 40 < 10a and <10p 10 R/hr@lmGA -30 % D Scan on the North wn!! (all metal surface) using a lmdlum 2221 rate meter with a 15cm detector (beta). 2 hicasurements on metal (in shaded area) ranged from -15 to - 63 cpm. 65 South Wall 30 < 650(MDA) 7 R/hr@lm ~41 % p Scan on the South wall (all metal surface) using a Ludium 2221 rate meter with a 15cm2 detector (bets). hicasurements on metal (in shaded area) ranged from ~15 to - 69 cpm. 66 East Wall 5 <90?(MDA) ~30 % p Scan on the East wn!I (all metal surface) using a Ludlum 2221 rate meter with a 15cm detector (beta). 2 Measurements on metal (in shaded area) ranged from -15 to - 68 cpm. 67 West Wall 7 < 907(hfDA) ~30 % p Scan on the West wall (all metal surface) using a Ludlu n 2221 rate meter with a 15cm detector (beta). 2 Measurements on metal (in shaded area) ranged from -15 to - 56 cpm. 68 East Tower ~30 % $ Scan on the Nonh wall (all metal surface) using a Ludlum 2221 rate meter with a 15cm detector (beta). 2 North Wall Measurements on metal (in shaded area) ranged from -I 8 to - 63 cpm. 69 East Tower NOT ACCESSIBLE South Wall 70 East Tower 3 < 907(NIDA) 12 < 10s and <10p ast WaH ~30 % p Scan on the East u all(all metal surface) using a Ludlum 2221 rate meter with a 15cm detector (beta). 2 Measurements on metal (in shaded area) ranged from -20 to - 55 cpm. 71 East Tower 4 < 907(MDA) 1I < 10s and <10p est WaH ~15 % p Scan on the East wall (all metal surface) using a Ludlum 2221 rate meter with a 15cm detector (beta). 2 Measurements on metal (in shaded area) ranged from ~22 to - 58 cpm. 19 L

1 . 7 u m r'" umums e mmW Table 4: Survey Results For Building 35 (Test Tower Facility) . As of SN9/98 Heure Iacation

of Fixed Maximum
of Fixed -

Maximum - # of Maximum . Sample Results. Exposere Rate 7 Measurements Result Measurements Result. Smears Result (seil/ paint / debris) . Range (pR/hr). (with 100 cm2 (dpm/100 cm2). (with 15 cm2 (dpm/100 cm2)' (d m/196cm21 a/S and or y Spec P detector) detector) - GA = Geewd Area t 72 West Tower 1 < 907(MDA) 16 17 a and 13 p SpR/hr@lm -30 % p Scan on the North wall (all metal surface) using a Ludlum 2221 rate meter with a 15cm' detector (beta). Measurements on metal (in shaded area) ranged from ~19 to - 45 cpm. 73 West Tower 1 < 907(MDA) 23 21 a and 67 p 10pR/hr@lm BON

N

~30 % p Scan on the South wall (all metal surface) using a Ludlum 2221 rate meter with a 15cm' detector (beta). Measurements on metal (in shaded area) ranged from -22 to - 6I cpm. 74 West Tower I < 907(MDA) 32 21a and 54 S 10pR/hr@lm aH ~30 % D Scan on the East wall (all metal surface) using a Ludlum 2221 rate meter with a 15cm detector (beta). 8 Measurements on metal (in ch= dad area) ranged from ~35 to - 50 cpm. 75 West Tower NOT ACCESSIBLE West Wall 76 Outside Survey completed during ct.r.wia asison Survey (also Figure 2 of characterization report - Appendix A). No contamination detected. South Wall Scanned the Outside South Metal Wall (50% of the area was scanned up to 2 m) with a Ludlum 2221 Rate meter with a 432cm' detector (beta). Measurements ranged from -570 to -843 cpm Scanned the Outside Concretc/ Asphalt Pad (50% of the area was scanned out 2 m from the building) with a Ludlum 2221 Rate meter with a 432cm' detector (beta). Measurements ranged from -1046 to -1237 cpm 77 Building Survey completed during charactenzanon Survey (also Figure 3 of characterization report - Appendix A). No contamination detected. 35-1 Two minute count (cp2m) background readings were performed at building 35-1 for Comparison at Building 35 (Test Tower Facility). (Shipping & Measurements n metal ranged frorn-389 t 35 cp2n Measurements on asphalt ranged from -449 to ~744 cpm. Measurements on concrete ranged from ~738 to 1034 cpm. 78 Outside 14 <l39 South Wall Survey completed during characterization Survey (also Figure 4 of characterization report - Appendix A). No contamination detected. 20 x

Table 4: Survey Results For Building 35 (Test Tower Facility) As of SNW98'- Figure Locatica - # ef Fixed. . Maximean . # et Fined 1 Maximum - # of. . Maximum : Sample Reseks v ' Exposure Rate Messarements- -. Result ' Measurennents :- Result Smeers . Result

(seil/ paint / debris)

Range (pRAw). (with 100 cm2 - (dpm/100 cm2) ~

(with'i5'c'm2 -

(dym/!00cm2). (d m400 cm2) -

a.$ red er y Spee -

P - - detector) - detector) - ca.c B Area. 79 Outside 7 <650(MDA) South Wall Survey completed during cb Ab k ini Survey (also Figpec 5 of c6 Ak k.im report - Appendix A). No contanunation detected. 80 Outside 7 1402 Concrete Pad (base of south wall) Survev completed during characterization Survey (also Figure 6 of c6 Aa.kmion report - Appendix A). No contam' ation detecteo. m 81 Outside 7 <970(MDA) Concrete Pad (base of south wall) Suncy completed during characterization Survey (also Figure 7 of d--bk.am report - Appendix A). No contamination detected. 82 Outside 6 <10s and <10 0 South Wall Survey completed during characterization Survey (also Figure 8 of d-iukmani report - Appendix A). No contamination detected. 83 Outside of 2 s-13pImr Building (14 measurements) (south side) Survey completed during c6 Aa.k iion Survey (also Figure 9 of J-.bkmani report - Appendix A). No contamination detected. 4 < 10a and <10p [ 84 Roof 21 m m m m -umu. -..A

Table 4: Survey Results For Building 35 (' Test Tower Facility) As of SMSfSS : F%=re - Locatie ; -

of Fixed

' Maximem. _ # of Fixed. Maximum

of

. Manimum Sample Results - Empeouse Rate Measurements ' Result Messureuvats - Result Smears Result (seWyaint/ debris) Range (pRlbr) (with 104 can2 ' (dpm/ ISO cm2) (with 15 cm2 .(dpm/100 cm2) (dyn/les em2) a/p and er y Spec detector) detector) GA = Gomeret Ana 85 Outside 100 % p Scan on Door (an concrete surface) using a Ludlum 2221 rate meter with a 434cm' detector (beta). NW corner hicasurements on metal (in cross hatched area) ranged from -1385 to ~ 20I5 cym. (conacte pad) Inicrnal GA Confirmatory Surveys 86 Ground iI 8044 dem/100ca" 6 < 10a and <100 Floor 100 % p Scan on floor (all concrete sunh) using a Ludlum 2221 rate meter with a 434cm8 detector (beta). hicasurements on concrete (in cross barM area) ranged from -816 to - 2061 cpm. 87 Ground Floor 20 < 1432 88 9' Level 4 < 907 4 < 10a and <10p 100 % $ Scan on floor (all metal surface) using a Ludlum 2221 rate meter with a 434cm detector (beta). 8 hicasurements on metal (in cross hatched area) ranged from ~508 to - 867 cpm. 89 17' Level 4 < 907 5 < 10s and <100 100 % 0 Scan on floor (all metal surface) using a Ludlum 2221 rate meter with a 434cm2 detector (beta). hicasurements on metal (in cmss ha**d area) ranged from -500 to - 1014 cpm. 90 26' Level 4 < 907 7 16a and <100 100 % 0 Scan on Door (all metal surface) using a Ludlum 2221 rate meter with a 434cm2 detector (beta). hicasurements on metal (in shaded area) ranged from ~493 to-989 cpm. 91 34' Level 2 < 907 3 < 10a and <10p 100 % p Scan on Door (a!! metal surface) using a Ludlum 2221 rate meter with a 434cm8 detector (beta). Efeasurements on metal (in shaded area) ranged from -301 to - 888 epm. 92 42' Level 2 < 907 3 < los and <100 22 1

TABLE 5: Test Tower Soil Sample Results (As of November 24,1997) Radionuclide Concentration. Fraction ~ Action Taken ID 2 Location / Figure #. =(pCilg) . or X Cs-137 Co40 Limit S6 -1 Outside (top 6") 0.45

0.11 0.64
0.13 0.11 None Seefigure 45 Levels below Criteria S12-1 Outside (6"-12")

0.32

0.10 0.55 i 0.13 0.09 None Seefigure 45 Levels below Criteria 56 2 Outside (top 6")

0.11

0.09 0.94
0.13 0.12 None Seefigure 45 Levels below Criteria S12-2 Outside (6"-12")

0.43

0.11 0.84 0.13 0.13 None Seefigure 45 Levels below Criteria S6-3 Outside (top 6")

0.20 0.05 0.95

0.07 0.13 None Seefigure 45 Levels below Criteria S12-3 Outside (6" 12")

0.51 0.12 0.72

0.21 0.12 None Seefigure 45 Levels below Criteria S4 in trough 87.210.96 6.55 0.36 6.63 Soil removed and disposed Seefigure 46 of as radioactive waste S5 in trough 193.3
1.16 9.67
0.32 14.1 Soil removed and disposed Seefigure 46 of as radioactive waste S6 In trough 0.2
0.08 ND 0.01 None Seefigure 46 Below the Release C:iteria l

S7 in trough 0.04

0.08 0.13
0.08 0.05 None Seefigure 46 Below the Release Criteria S8 in trough 78.64
0.94 11.48
0.48 6.68 Soil removed and disposed Seefigure 47 of as radioactive waste S9 in trough 10.16
0.27 1.69
0.15 0.89 Soil removed and disposed Seefigure 47 of as radioactive waste k

S10 In trough 0.25 0.07 0.07

0.06 0.03 None Seefigure 47 13elow the Release Criteria

( 23 c -s I

L f r

Radionuclide Concentration.

Freotion-Action Taken 1 [ i 10 [

LeesemenFisere s :

. (pCWa) t lor C Co 137 S 1004:U 3 i umit 1 SII In trough 0.41

0.09 0.38
0.095 0.08 None Seefigure 47 Below the Release Criteria S12 In trough ND ND None Seefigure 47 Below the Release Criteria S13 East end of trough 10.76
0.18 1.74
0.11 0.94 Soilremoved and disposed of as Seefigure 48 radioactive waste h

S14 ' East end of trough 16.16

0.23 2.9
0.17 1.44 Soil removed and disposed of as Seefigure 48 radioactive waste S15 East end of trough f-12.74
0.20 2.29
0.12 1.14 Soil removed and disposed o.'as

[ Seefigure 48 - radioactive waste S16 West end of trough 0.96

0.08 0.28
0.07 0.10 Final Soil Sample Result Seefigure 48 e

S17 West end of trough 0.70

0.07 0.16
0.08 0.06 Final Soil Sample Result Seefigure 48 S18 15" from east end of ND

-ND Final Soil Sample Result trough (~3' 2" deep) Seefigure 49 Sl9 32" from east end of ND ND Final Soil Sample Result { trough (~ 3' 2" deep) Seefigure 49 S20 44" from east end of 0.07

0.05 ND

<0.01 Final Soil Sample Result 7 t trough (~ 3' 2" deep) Seefigure 49 ( S21 East side wall of 0.06

0.05 0.04
0.01

<0.01 Final Soil Sample Result trough (~1-2' deep) Seelisure 49 1. Uranium and thorium concentrations were at or near normal background levels (including U-238 and U-235). 2. Samples were counted for 30 or 60 minutes using a high purity germanium detector system. b 3. ND means "not detectable": < 0.1 pCi/g Cs-137 p < 0.1 pCi/g Co-60 t 4. Background Cs 137 or Co-60 sc,il concentrations not subtracted. 24 r L f

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lll=".t"" '-' '""' ) tors f N EUI , n-3 _j ,1

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=::::lll 6 [," gf g { <$b ~ g., s / ' 21 i k Y g~ a-2 tors k i i y "a )2 count u a f f h L

== 8 N = / '~ 7 W%g U 4c t0TS. UCS0 I a f --- FENCING PROPERTY LINE 0 250 500 750 1000 M. N 1) Figure 1A: General Atomics Site 1

I Figure 1B: Drawing of Building 35 (Test Tower) y s h -{

s:-

N <- > S f,- s..- l__ ' f. r--- s: W 7- ~ -85'0" . l/fN/ h -. l / / /y/._.._p..yr/ ! d u / s / / lJ/ l / e/ / / ~28'0" b-35.vsd o

Figure 36: Ground Floor Level-Initial Scan N h I1 E A B C D E F G H I J K L M y'V7 v L s 0,,0 1 o= Denrs // /

>yy;I'f)

/,3_/ //, /,77,= yd ~ &;,o,,, /,M7j j}v'? s f/II 'Y. $,i / i '///rf,' h.? //,//}/i,f/,'W',,//,}/ 'lj'.if,'/f, /,f,l// ' '/ ' 'h / N ) (Ib' IddbQ(dy'$Q)$f' d'4jd[om'to}6800 cpm /,/,'/, 'b',i,}Y/ //fh/ ttoy[rscar,t 704c I, / 4 3 ,/ / / / / /1/ h,,..,,,,./i~/,,,,,,, / 6 Large seau namon RoHup Door Door I l j = 2 Meters N_QTES:

1. Large area Masslin smear wsAtaken on all surfaces before start of survey. No activity was detected.

2.100% of the floor was scanned. $ Scan results (in cross hatched area) ranged frorn 704 cpm to 6600 cpm.

3. Scans were taken with a Ludlum Model 2221434cm2 detector floor morntor, Ludlum S/N 73701.

4. All concrete surface.

5. Detailed scan results are shown in figure: 37 tt36.vsd t

Figure 37: Ground Floor - Init;_il Det:iled Scan R;sults N A 21 y E NTv 5 A B C D E F G H I J K L M 0, 1 00ift I I I 3 { {I 1204 cpm I 932 cpm 2 7 '*P*

2400 cpm 2

came. W means ** +6800c m 775 cpm = 3 Highest kesding 868 cpm te e n ns eec"'* ggecpm i 1304 cpm 1210 cpm 4 730 cpm 1138 cpm 1136cpn 133Bcpm .973cpq 5 101sepm as0 cpm 983 cpm l l Tf00ipm I I88'P" l 6 hargeRoaue wm i Doot - Door I l = 2 Meters I Notes.

1. A 100% detailed p scan was Mu iied on the ground floor using a Ludlum 2221 pupviin ei gas flow detector with a 434cm2 probe.

^ -

2. M scan rsuits are in cpm.

3. AH concrete surfaces.

4.

Elevated readings found at these locations. Areas checked with hand-held instruments.

tt37.vsd i i

N Figure 38: Ground Floor - Initial Hand-Held Fixed Measun. eent ha w4 1P 5 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Tr_ough_ __) WDm Trough s 81' 4 1 k 400m m m %,.d ( ~ D 800g m a s% U" 1a-+ Ronup Door Rong Ebor ~ t E!!;$1lE

1. A 100% $ scan was performed only on the *etevated areas using a 15cm2 hand held GM detector on ground level.

Scan resun ranged from 250 cpm to 1000 cpm.

2. All concrete surfams.

SSO wd

N Ah* Figure 39 : Ground Floor - Post Decontamination Results f s -- h--.!WDoors l____TroughI D?uJLh iJ Y _L i e,cwcar aox m / Uf o Maximu readng of 1002 #eW100cm2 gy 5-N Jack hamrnered area Maxknum of <301&rW100cm2 -3r sce *t-ea Maximum readng of <301 cprW100cm2 Not to Scale is -.-. Rollup Door Rollup Door Notes:

1. The elevated areas on the concrete floor were scathied (in light shaded areas) and then Jack hammered - 4" deep (si dark shaded area).

2. One minute fixed p rneasurements (total of 3 readings) were taken in shaded areas using a Lu&ium Model 2221 (100cm2 detector)

Maximum reading of 1082dpm/100cm2 (stiG below tr.a release criteria limits)

3. AR concrete surfaces.

tt39.vsd

Figure 40: Ground Floor - Final Removable Contamination & Fixed Measurement Results N A W4 WE A B C D E F G H I J K L M W Y (3) (2 S (9j3 (9 301dpm} 301dp 3 j Dw

ggl, 3gggpgl 1

-oms 301dp Sh 301dpmj h (9h301dpm 0 301dpm 2 h30idgmj j j l (9f-h301dpml-h--- h301dpml-h -h301dpml-h h-h301dpml-(4h (4) 3 wait h301d,m] h301d,ml <301domj! h301dpq l h30idemj wall ___ h301dpml- --h301 dpml-- (1)~h301dpml-h (2)-h301dpml-h-~ -h301dptrj 4 h301dpd h301 dom l Floor j h3eidpm] l 9) -h301dpml-(0) h-h301dpml-(1) --[301dpml-h (3f-h301dpml (4) 5 j I h301ded h301dpml h301dpml-h-h-h301dpml-h h--h301dpml-h h-h301dpml-h l g,,, l-6 Large saan nome Doot Rollun Door (0%301dpm h301dp h301dpm 3) (4) l l l l { = 2 Meters 1 Notet

1. The values provided are the approximate locations of measurements taken. One minute (cpm) fixed S readings were taken - every 2 meters (5tal of 27 readings) using a 100 cm2 detector. (shaded boxes denotes location of 12 additional readings). The maximum results was <301dpm/100cm2(MDA).

2. The numbers circled are approximate locations of wipes taken (57 wipes). Wipe results, p is 17 dpm/100cm2 & a is 16 dpm/100cm2-

3. All concrete surfaces.

e4o ved

Figure 41: Machanical Shop - Removable Contamination Survey a e 1e e e e e l 0; 6 s 88 8 8 t S@ OE 8 8 g a _s. si e e es e a f-- -- lLockalDoors ' h Troo Ground Floor Rollup Door Rollup Door t 1. The values provided are tie appradmete locanone or meestruments takari.

2. The numbers orded are syswaximate lacemne er wees takert Wpe remuas. pis <10 dpmt100cm2 & a is <10 dpmr100cm2.

Shaded spes dancies wet beam unpes. AE other unpas on tencrete floor Erfats set me

____ - _~_ ~ ~ Figure 42: Ground Level.100% p Wall Scan & Exposure Rata Results on the Walls I A B C D E F G H I J K L M .a....

/

I I ! I i z /[ - W4' >E Exposbre Rate Measurements range from ~ 10 rto 1h R/hr _ / i 600-785 cpm i 4 560;785 cpm 4... _._.._ [ _..._q._ __._. [ ..d.._ -. / g y k = ~ p y, g / p e f yA I = 2 Meters Notes: 1.100% p scan was peformed on the walls up to 2 m using a Ludum Model 2221/434cm2 detector floor monitor.

2. Exposure rate measurements were taken - 1m from the walls. General area results ranged from 10 R/hr to 16 R/hr.

3. All metal surfaces.

fig 42.vsd l ~ L..

N Figure 43: Ground Level Trough - initial Survey w4 P* a s ContaminatedArea I49 hest Direct Frisk = 1000qmV15cm2 (28,562 dpnV100cm2) I*ghest trunrect (removabie contamination) - 1000cpmn00cm2 (4.395 #nv100cm2) 8pR/hr 8pR/hr 10gR/hr Spi %r 30pR h r Enlarged l Contaminated Trough JJ '**"*****'*l Trough ___ p______ "I" Beam "I' Beam 'I' Beam "I' Beam Notes: 1. Initial detailed survey (See Characteriza8on Report, Figure 15, pg.17). 2. Exposure Rate Measurements were taken in the trough at one (1) meter above ground 3. Direct and Indirect readings were perforrred in the trough (see results above). 4. All concrete surfaces. Rollup Door Rollup Door tt43.vsd

Figure 44: Ground Level Trough. Surveys during concrete removal. N A W41E Contaminated Area 7 Exposure Rate Results Concrete Removal S _ __ _40p,RJhr OpRlhr r O on a Condt.it pipes d Contaminated Area Fixed Measurement Results r-0000 +. Conduit pipes # i i 1400 cpm 800 cpm 1200 cpm Enlarged Contaminated Trough .j l"1 Trough 1 1'L r NOTES:

1. Contammated concrete was exavated from the trough using a jackhammer.

2. Numbers are the approximate locations of Fixed & Exposure rate measurements.

3. One mmute (Cpm) fixed p readegs were taken (total of 3 readings) using a 15cm2 GM detector &

Two exposure rate measurements were taken in the trough. 4. Maximum exposure rate result is 60 pR/hr 5. AR concrete surface. tt44.vsd Rollup Door Rollup Door t

N hha Figure 46: Ground Level Trough - During Remediation 'wg v s m ~ m m Rate Measurement Results concrede & Dirt Remover-21rdeep 28 R!hr 30pR/hr 30pRmr. ; 28pRthr - 24 R!hr 22 R/hr O OO O a Conduitpipes J North Wa8 -+ E9com" W5 cpm b 8 9 Fixed Measurement Results s

P" ~* '03CP"'

"0CP* Scan Results: 120 cpm - 200 cpm souttiwan--+ t1ocam escom 1oscom '- OD O socom ioscem ; Conduit pipes & Enlarned~ se-t su su Sy-' sga s1g3 Contaminated Trough J l " C* l Trough [ [. h_) Notes:

1. More contaminated concrete & dirt was exavated from the trough by using a M..n.n e.

6 soR samples (S S-3) were couected in the back outsde trough. Surfaces at 0" to 6" and sutHBuffaMs at 6" to 12"(resuRs below release critera). Please see table 5.

2. One minute (cpm) fixed p measurements were taken -every 1.3 ft (total of 16 readings) using a 15cm2 GM detector Six exposure rates were taken in the trough.

3. The maximum fixed measurement <1432 dpm/100cm2 (MDA). Maximum exposure rate resut = 30 R/hr &

Scan ResuRs range from 120 cpm to 200 cpm. 4. AB concrete & Dirt surfams. tt45.vsd Rotlup Door Rollup Door

. x) - LJ Figure 46: Ground Level Trough - During Remediation N Shop ooor Trough a W E-M N 28 R/hr S-6 30 R/hr { / "' 3 ~5" ( S-7 Ds % s-s, f "o o 1 ^ ~, / s s m ~ .OO O ~ Goncrete e q* r -o o-% 9 a \\ ' T sill. s & *g %,a

m x

n. x x .w n x. _g .I o s 7 = c m ~ n y CoHc, rete / Soll, 3 bh] ( \\o, s' g . or g g o o-o 55" NOTES. 1. Four samples were collected S-4 through S-7; sample 4 & 5 were above release criteria. See table 5 for soil sample Results.

2. Two exposure rate measurements were taken. Exposure rate results = 28 Fbhr to 30 R/h tt46.vsd t

. m-

^ ~ ~ , y Kj - L,) Ground Level Trough - During Remediation Figure 47: 14echanic Shop poor WW-Trough E X = I ) l' #N m Concrete'\\ 48Iwr 1 ( + o contact - ,= ^ 6 M Q -Q,O CK ^- 4 Concrete _' T S-11 _N 6 g ~ ~ m ~26" =- 7 1o z-f r sg- 'Concre r t-s. o~ ~ s s o o %g ncpe/ if

/

S-1,2 S-10 8 ~- ) 8 ,7 o Q u u ~_ \\ \\ 28 R/hr 32 R/hr 32 R/hr NOTES. Continued to exavate contaminated concrete and soa from the @ 1. 1

2. Feve Samples were cdlected S S-12; M contaminated am the h m M e 5 h e

@#N

3. Four exposure rate measurements wem h. Expose raw mA = WW O 1m M 4.

M Concrete & soit sudace. l tt47.vsd ~ '

~ n e) LJ Figure 48: Ground Level Trough - During Remediaron N Shop Door Trough W E g r Concrete '= e,- "A \\S-17 28p%r @ph s _L S-16 m f* ~u ~' -Soil ~26' $t f-o x 's %,a s w.% n h- ~ .m o-e 3 C5ncrete /,bil uN -~ e s b.- S-13 ^ ~r o = -5 S-14 e (N

sq 3

g.' ,_o. o o. .j NOTES. 1. Contnued to exavate contaminated concrete and soa from the troupt

2. Five Samples were conected S S-17; AR contaminated above the release critreia. See table 5 for sarmie Results.

3. Two exposure rate measurements were taken. Exposure rate results = 26 Rhr O 1m and 30 RM O contact 4.

AR Concrete & soH surface. tt48.vsd

/ j: Q. ~ Fleure 49: Ground Level Trough-Final Survey Mechanic Shop poor i Trough W E X ( N i ro s ' - b All 10 Fixed Measurements < 1432dpm/100cm2 .s o a "s 26 R/hr s Solh. a 3 'c _g e 'e. g n. 1 s s 3g-o:" 28 R/hr 28 R/hr 8' 28pR/h(/' N-3 r %= dConcrete Ibil N sq 3 - 28pR/hr 28 R/hr e o. %o S-S-19 S-18 ) N -r(;} ' s s 1 L.20 q \\~ ) 44" 3T 15" I 1 i i 1. 4 Final sou samples were collected S S-21; Au results were belout the release critefia. See table 5 for soil sar9ple results. 2. Six exposure rate enessurements were taken. Exposure rate resums = 26 R/hr to 28 R/hr.

3. All 10, one minute fixed measurements were < 1432dpm/100cm2 (MDA) 4.

AR concrete & soR surfam. tt49.ved ~.

N Figure 50: 9' Level.100% beta Scan & Fixed Measurement (s) Results on the Floor g i i y I A B C D E F G H I J K L M 8 i .i_------' _ ~ _..... r-4 Wall 1 Wall 750mm - 804mm p scan preerwy 45com - 75com p scan post survey 7 ' 7 r i,e r i. ' I'? '.I ',] 9' 071&d stairs '. -(.Flo6r', ; 2 watt stairs wan Leyel / A /. an-4sscpme es0come,se_. .4ascom noemoacan / r-t i-3 I i i Pest demn survey l' I o-- .. l......_ j.. 4._._. 4... -. _ 2 q.__ j. 4 l l ggylp,gg l l .l_ .l_ _ t._ _.l 1. i I I I I 5 I I I I L. _ _ _ _ - - ___=___________4 6 l targe noitup smen l Door ROMup Door - - - - _ _ _ _ - = = = - - -. - i j = 2 Meters i Notes: 5 1. -100% of the Soor was scanned. D scan results (n ooss hathed area) ranged from 485com to 804 cpm (initial survey) with 434 cm2 Soor monitor. Readings were taken after decantammaton wth a 15 cm2 GM decedor and read 45mm to 75mm ater f decontamination (< 650 dpm/100 cm2). 3

2. The values pnmded are the approidmete locahons of measurements taken. A two rninute (cp2m) Exod 8 readin0 was taken i

(total of 1 reading) using a 15cm2 detecto;. The mammum result was <650 dpmf100cm2.

3. As metal conaute sur8 aces.

I 1 t:50-51.vsd )

~ Figure 51: 9' Level. Fixed, Removable Contamination & Exposure Rate Measurement (s) ww9>s LJ A B C D E F G H I J K L M s ...p._.......__. 1 watt wan i <285 <289 <289 stairs 9'. pMr stairs 2

war, p,oo,.

wog b '*V [ 8 <= @<2 <a. i <2== 3. 3 l l l !.__.. jl.. .. j. .. l.. 4.. .__..+ s. p. 2 2 4 l I agy!p,gg l l h ... _. -.. +.. 1 I i l l 5 i I I I 6 l Large Rottup smart. [ Door Rollup Door l .l I = 2 Meters. NOTES:

1. The values provded are the approximate locahons ofitxed measurements taken. One minute (cpm)1 bed beta readings were taken - every 3 meters (total of 7 readings) ussig a 100an2 detector. The maximum fixed measurement results was <289 dpm/100an2.

2. The number in the cirde is the approxwnate locahon of a wipe taken (removable messement) Wpe results beta = <10 dpm/100cm2 and alpha = <10 dpm/100cm2

3. 1 exposure rate rneasteament(s) was taken. Range was 9 pRMr.

4 All rnetal surface tt50-51.vsd . = _ -

_ _..~._. ~ N Figure 52: 17 Level.100% p Scan Results on the Floor & Walls 4 l W E w v s A B C D E F G H I J K L M T,,/, ,.f .h' / /.A.1 %.> W M @? W.,,.i., T, .h' / /.f .f ' /.f ~: T l 1 r ./ /< / J J ,'/ ,X, ' / Q_fl' J,.~ J// K / ,(. /, 1, v/ J;, ..f ..J /. -//R / J J i. /, i u .,/ //w/ < ,/y $/g. J./ _.y;, ;j /. r, 2 wau stairs ,(,, y; stairs _.g 3 g ,g- %g ; ,./ e, s .s /r / / 1/ .1 ,e .s ,?-/-.kd.A ;A A-;? :A :l:.Ay-.s..; ,/, '.j.' / J./ j.. / J/ / j/./ z. 3 l /r inlooir -,y, y, y - - 'y j. 4,.e.g:.f x.g.;::1.e. g..e s,: y i . 5/ A.WW .W W/. 4 l l BayArea wallt'./ _Q7 i (. ' ;:/;..k;.'/ BayArea f l l / -4' ./N .R ,/k< /.4-.5'-/}:/Ly:.f.:47:.4g':. :L t. 4-4.y:: dif ie 1 1 r! r/, .,y / l \\ /, if 'J i 5 ,t. ll /-y /3 X / / ' Y, fl i. .k 44'.g /.f::.J::.f: f: /..g.g. v 9 g'g g:.j s._ h-j ,' '.'. gg : g _../]./ '/i/, //j Large Rolk9 Gan H Roke; Door ' 410 cpm 4.532cptn 11 Scar 7/~ h /} / < ~,.4 /. 6 = 2 Meters I NOTES. i 1.100% of the floor and wats (up 2 meters) was scanned. p Scan results (in cross hatched area) ranged from 410com to 715 cpm. f 1

2. Scans were taken with a Imdtum Model 2221/434cm2 detector floor monitor.

3. AH metal surface.

tt52-55.vsd I

N Figure 53: 17 Level. Smerr, Fixed Me:surements & R:t3 Me=urements R=ults a l1 w E wv S A B C D E F G H I J K L M i ? r 1 4*all oa 39 g g <p. g g o 89 e, o,. o. o8. o <=9 2 Wall Stairs i l Stairs Wall 7n, h h, h <289 h <2 9 b' <289 x289 8. <289 <289 <289 f 1 3 l l 400c,m m b., <289 <289 p d&_'100cun2 (MDA)- t-- k.5 5. 4 - - - - + 1 6------ H wlth a 15cm2 GM detector 11 4 BayArea l R ' l. L Bay! Area 2. 9 <28g , g,, & j 3 on t./ - 150 cpm Post;decenned g l ll <660dpm/100cm2 (MDA) 5 with a 15cm2.GM doctector i y .f.* O** i. 6 targe nouup g,, g,a m j Door i l Door = 2 Meters

1. The values provided are the approximate tocations of measurements taken. One minute (com) fixed p readings were taken

- every 3 neters (total of 22 readings) using a 100 cm2 detector. The maximum results was <289dpm/100cm2 (MDA).

2. The rmwrs circled are approximate locations of wipes taken. Wipe results, p is <10 dpmf100cm2 & a is 12 dpm/100cm2.

3. 1 exposu ' rate rneasurement was taken. Range was 8kR/hr general area. 4. Two M spot? were found in grids H5 and F2 and decontaminated 5. All metal surfaces. ttS2-55.vsd m

Figure 54: 26' Level. 100% p Scan Results on the Floor & Walls N Wa m eL A B C D E F G H-1 J K L M 'sI r s + !/ j / l/

$/* '

/, t, /.'.; /

/ /

? / ,' / : s /e - {l ',/. ~ ]../fi / */ j/l.',/ / ],' / ' /,' /'l.IWall/j./ /i, ' q'.' ~' ~ !/, l /,7,/,/ - / y .. /490c,ptn,/W SB. cad.- f .. /. <./r.. i./>j, r r j. r, < e. /,, r - -/. r./ y. yi ) r i n .t / s / / . /y/ / /. - - ;p

/ !

/ris !? /;/ / r i t if

r,-

r Q ' %fgll./

/.-

/ -' ? 'q e ir7.r r / w /s /< /. [fgg,(g /y s ... / /* t / at i .]/ / / / J/ / / / y,', ' }'/ '/ ' p' '. Stairs

/ /

'/ /u'/ /,' / / .c // ': ~/ / q/ ,j! _/.p/ y: /. /. / / / /: .:. / , / j/ /. 'y f s ,l --f. / j f j' j'ff -f, / / s y; s, y.- 7 / i.* y, >s ,/p ~. y

y. j

<y -/ / *< 4 4.jd.44..p:' /L4 4.;-.f.J J ;'.h' /,f +'p...hd./.J.././ '.,. ; :,s,J.4 i < /;,f ' /g/, ' j, ; ' ' - b K '/ / /$,./ / ' /$'; / /'tj, //1 ig j sjj ' j;j,/ k. _/ / j/ /', /$ / 3 ( l ! ^ h.! '/l / }/ - s s v ',' r / ' _, sJ/ ','..:lh/, j'h / l..! h/ '- / / x 's. r' '/.j <.<./' ,c I. s s. +..

p. s.e??

/ / i: s p.p..."..+.+ /,/ /...: ?.< / :: :-.<~ l/ s /t : E / / / f; / j+..,.e,s./. p</< j5 j / u s e. /:-, - l l ..r+--+ s..p.. pn s. + y + .y p.-4 s... .j ,._f j : j ; _.-,- j j _y g,p -.- y / [ 'Y j . / / p' f. .: s /s/ '/ // / /.t' / iWstl' r 4 l l I. B&y .s si

s s

SA t i

,../ /

}s J /: f // ~ / 's'. <. "k / / ..I'

; r.,/

,. i,/;/ /. /.? 'fs /// r r;./, - ,/ ~<.. i a;! / < <! / ~ /.,'. i,/. ~/.< .i.f ;E lY::f./ x: cp -? ? .4 /

f,

,/si i! /,;f i p . /. + -~?- q; :.+-f-?-~-.?;:?-~? -? ;#. f-:?-.+.. 4, -.t :?-- ~:t,. can/ / }, f--y/ l l //.V, ' ////,4eocpmfssoi:prnis,. A. / / / :/ / / / j.'/_. / / ;! /,'/ 5 g /il . / /,/ / / j t/ g .. /.i

/ /.'/,/ / /

/ - / i./ / E///

/ /

.' / /:. - i / i <- /. ' /. / /; ? / , / s / ! :/ < e 3/ '.' /I / y r; / ?.i '/y' / &W;;(';f;.:!"f'pf,7 "!;;!f;!""'/ 8./ / / l/ / !E~f5".!n!nAf:!"!"? f;.!"- '"Y":!, //./ = / ' _ _ _ _ _ _ _ _ _ _ ~ " ] i" 6 ~ j<if / / ! !/ / +/ / / , /1 /.<: / / /:s .i ./ ' /./.1 / - /.e - '/ .! /, SY.!. / / ' kf ~ l .fj'j. /.if90CFtnl730cptn_fy'.,/. ' /)$,, l .. )'./ 5 i = 2 Meters NOTES. 100% of the floor & walls were scanned. p Scan rest.4ts (in cross hatched ares) ranged frorn 380 cpm to 720 cpm 1.

2. Scans were taken with a Ludium Model 2221/434cm2 detedor floor monitor.

3. All metal surface.

ttS2-55.vsd

Figure 55: 26' Level. Fixed, Remov:ble Contamin',. tion & Exposure Rat 3 Me'surement(s) y n lA w s W A B C D E F G H I J K L M v s l 1 wa!!

ase g

g <2se <res <2es

<2ss l

2 wait i stairs stairs hA des <2st f3 f3 A

c

'det %m C C t'J C 3 100 cpm Post decenned i <S60dpm/100cm2 ' MDA) Waff [ with a 15cm2 GM detector f7 i. j -.--.<200- -+. + - - 1000 cpm 4 Ba}iArea Floor R*go,,, l' with a 1 GM detector v. 9 m_ .,gge _b 5 ll i v -J d".g g <ase-7-@ g .<ees 6 watt + = 2 Meters

1. The values provided are the approximate locations of measuremerts taken. One minute (mm) fbred p readings were taken (total of 19 reedengs) using a 100 cm2 detector. The maximum result was 289dpm/100cm2 (MDA).

2. The numbers cirded are approximate locations of w$es taken. Wipe results, is <10 dpm/100cm2 & a is <10 c$m/100cm2.

3. 1 exposure rate enessurement(s) were taken. Range was 8 R/hr general area. 4. Two

hot spots
were found in gride D2 and J4 & 5 and decontaminated.

5. All metal surfaces ttS2-SS.vsd t

Figure 56: 34' Level Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) N W E o s % N .x NN\\ ~ 289 -T . NI 1 ss. s. .. xs.. .s- ,,<289, s V /290 \\' \\\\N~ \\ \\\\ '8048*- 580cyn A5m s xN AsN .NN NxNN x 3 _75 qy x-s s sx -s - - - j - s s s s s s s s x 1 ( ~41' Notas;

1. The vahaes provided are the approximate locations of fixed measuesments taken. One mutute (cpm) fixed S readings were taken - every 5 meters (total of 4 readrigs) using a 100cm2 detector. The maximum fixed measurement results was <289dpm/100cm2 (MDA).

2. The number in the circle is the approximate location of a wipe taken (removable measu'ernent). Wipe resuPs l5 is <10 dpm/100cm2 and a is <10 dpm/100cm2

3. - 55% of the ficor was scanned. Scan results (in cross hatched area) ranged from 460 cpm to 580 cpm 4.1 exposure rate measurement was taken. Result was 8 pFthr general area.

5. All metal surface.

ttS6.vsd

Figure 57: 42' Level Sctn, Fixed, Removable Cintamination & Exposure Rate MIasur; ment (s) s r N T <289 \\ <289 <289 h shh dMIkb Yh N hhhhh kk\\ h \\\\ hhh y,s s ss, , s s s s ss -s . s s sss s s , s s sssss ,sss-s ss -s s ss s ss .s ss - s s s ss a 7.5' \\ \\ k \\ 41'0* Notes.

1. The values provujed are the approximate locations of fixed measurements taken. One rninute (mm) fixed p readings were taken - every 5 meters (et4 of 4 roadwigs) using a 100cm2 detector. The maximum fixed measurement results was <289@m/100cm2 (MDA).

2. The number in the circle is the approximate location of a wipe taken (removable measurement). Wp results S is <10 dpm/100cm2 and a is <10 dpm/100cm2

3. - 50% of the floor was scanned. Scan results (in cross hatched area) ranged from 392 cpm to 508 cpm.

4. 1 exposure rate measurernent was taken. Result was 9 pR/hr general area

5. All metal surface.

ttS7.vsd

Figure 58: 50' Level. Scan. Fixed. Removable Contamination & Exposure Rate Measurement (s). y S r \\\\\\ \\ ^ 28'0" r N \\\\\\ \\ \\\\\\ \\ \\\\ 28'0' Notes.

1. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed p readings were taken - every 5 meters (total of 3 readings) using a 100cm2 detector. The maximum fixed measurement results was <289dpm/100cm2 (MDA).

2. The number in the circle is the approxirnate location of a wipe taken (removable measurement). Wipe results p is <10 dpm/100cm2 and a is <10 dpm/100cm2

3. - 50% of the floor was scanned. Scan results (in cross hatched area) ranged from 395 cpm to 585 cpm.

4. 1 exposure rate measurement was taken. Result was 9 pRhr general area.

5. All metal surface.

ttS8.vsd

Figure S9: 52' Level. Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) ~12'0" \\ N y 'd@MM&M@h\\\\\\'6:h\\8Mt@ MOSS @tl6x\\\\\\Mhh&'8x \\ \\ <289 4 N h >u29b v K1!> y NNN mm.

1. The values provided are the approximate locations of fixed measurements taken. One minute (corn) fixed p readings were taken - every 3 meters (total of 3 readings) using a 100cm2 detector. The maximum fixed measurement results was <289dpm/100cm2 (MDA).

2. The number in the circle is the approximate locabon of a wipe taken (removable measurement). Wipe results S is <10 dpm/100cm2 ar.d a is <10 dpm/100cm2

3. - 50% of the floor was scanned. Scan results (in cross hatched area) ranged from MiSepm M 577 cpm.

4. 1 exposure rate measurement was taken. Result was 10 pR/hr general area

5. All mertal surface.

ttS9.vsd

Figure 60: 63' Level (West side). Scan, Fixed, Removable Contamination & Exposure Rate MeasurementG) N q:pp2 1 1 ' gh!b. fat i bbE h i t k' <289 <289 5 \\\\ s ( \\ -T S* \\ 49 \\ .I -26' If9!EL

1. The values prtmded are the approximate locations of fbed measurements taken. One minute (mm) fixed p readngs were taken - every 3 meters (total d 3 roadngs) using a 100cm2 diasctor. The maximum fined measurement results was <289dpm/100an2 (MDA)

2. The number in the circle is the approximate location of a wipe taken (removable fnessurernent). Wipe results p is <10 @m/100cm2 and a is <10 @m/100cm2

3. - 50% of the floor was scanned. Scan resuRs (in cross hatched area) ranged from 425com b 580gm.

4.1 exposure rate measurement (s) was takert Resut was 8 pR/hr.

5. AR metal surface.

tt00.vsd I

Figure 61: 63' Level (East side). Scan, Fixed, Removable Contammation Exposts Rate Measurement (s) N s /// /

55) N h

//,/,

/ // / / / -

//s,//// /,,

7 /////// //////// f//// /// // / s). <304dpm / )@ y/ / ////////////////L.!//////.W// / ~ W/} sty / '///////// ,'f r /// (1g0)///// ~ 5 '7 15 o' Mana;

1. -50% d me Moor was scamed. $ seen teams On aces hattried apes) reWom 385gwn 22 620gwn.

2. The values pnMead are me approdmme locanons d.. .a taken. One mwiuse (qwn) tued p remsnem unne tahan - every a meiers (toed W 4 venengs) unng a 100 an2 doestsor. The ensemwn teams was <30edpmnoocrre (MDA). 3. The nunters orded are approuirnsee tocasons d apes tahert wpe reewis, p is 13 damnooan2 & a is <10 dpmrtcocrn2. 4. 1 encoswe ruse.. _. a was tahen. Fhumas was eptww geners area.

s. As wood surteess.

sei ne n

N Figura 62: 75' Level (East side). Scan, Fixed, Removable Contammation & Exposure Rate Measurement (I) s ///// b (' ' 'N' ////? ^ Y l ) ////// 13'0* ~ / //////A//////3833600 t ecan'//// l r j// //g/ ////////// ////asty'/ / 5 _'N 15'0" h

1. The values prowded are the approxrnate locatens d fbed measurements taken. One minute (cpm) fixed S readings were talen - every 3 meters (total of 4 readings) us:ng a 100cm2 detector. The maxenum fbeed measurement results was <304@mf100an2 (h0A)

2. The number in the crcle is the approximate locatai of a wipe inhen (removeole measurement). Wipe results p is <10 dpm/100cm2 and a is <10 @mf100an2

3. - 50% of the floor was scanneti Scan results (in cross hatdied area) ranged from 383com to 580grn.

4. 1 exposure rate measurement was talert Result was 8 pRMr general ama.

S. AI wood surfaces. tt62.vsd

N Figure 63: 80* Level (East side). Rxed, Removable Contamination & Exposure Rate Measurement (s) s l N r m N <907 <907 'N x -25 '4 Q\\ .l -15' L i

1. The values prended are the approximate locations of fined measurements takert One minute (com) fixed p readngs were taken - mery 3 meurs (total of 4 readings) using a 15cm2 detector. The maximum fixed measurement resuRs was <907dpm/100cm2 (MDA).

i

2. The number in the circle is the approximate location of a wipe taken (removaNe measurement). Wipe resuRs p is <10 dpmN00cm2 and a is <10 dpmM00cm2.

3. 1 exposure rate measurement was takert Result was 8 pR/hr general area.

l

4. M metal surfaces.

ttS3.vsd ? l l

Figure 64: North Wall. Removable Contamination, Scan, Fixed & Exposure Rate Measurement Results i l i l West Tower 8 East Tower 40 50 cpm p Scan i t. ..;., / a Q t... .s------ w{ _. / N j/.. ..{ N -._./. I /N p-.--_~ = <907 / N/ @ II((If[II[f Yh _$> a/ h-s come.ier yn,,ine.e

w. -

-g /Illllil!Ill . ' II}il Ull l IMfi((I][^ NFW N/ NI k ~ ~ ~ l 47 ..m 64 f4 Nf.... ~ \\ ^ / - - - -- :.----~em - =&pr =.-- ~

=---- - - -

% /6 a. / 'N / x/ a ww-

1.

2 ('tTJ) 4 76 wmmmm6m._ _,mh)nmm6Ps /_a - _ N. .,/ 'N tt t ...~: g s-a ~ = - w =- = ~.. - _w =_.= :. .a .. _ _ / _ _.- - -. -y.

.: = _.- - -==%=, w = -3n. =

-..=.=-w 35. 563 cpmp Scs n - =. p.

I..--...pf

__5 l 907 <907 ,/ m ,,_,f m o' [;.g; --- r .__,,y~.,y my h r. f/- ' h ~~ Pipe. h our . -h / 1 - 2h c _- kQ wm4~;W~^ '=5% Q % mf,,m;3nyu +.& NOTES-

1. About 30% of the channet iron was scanned Beta scan results (in cross hatched areas) ranged fnarn 15 cpm 43 cpm using a 15 cm2 GM detector.

3. The values provided are the approWmate locations of fixed measurements taken. One rninute (cpm) fmed beta readngs were taken every 5 m (total of 7 readings) usng a 15 cm2 detector. The maxtmum result was 907 dpmf100 cm2 (MDA)

3. The numbers culed are the approximate locations where wipes were taken. Wipe Results p = 22 dpm/100cm2 & a = 13dpm/100cm2.

4. One exposure rete rnessurement was taken. The resun was to pR/hr.

5. A3 rnetal surfam, tt64 vad 3

f

l 1 r"sure 65: South WaH. Scan, Fixed & Exposure Rate Measurement (s) 1 t 2 l East Tower West Tower J .7, L._ . _ _.. _. ] r =i 15-68 cpm p x.. ..___._.__..n___ . :x.._ _3 \\ l / \\[_A N/ \\ ysacc3a:;uaxx c yasuxanuxx.ua --y.. _. _ _ a:cc:iu oc w.___ s. / N/ V N L .3 4 A A ~, x;;;ay xxxxuy y :mb~ fk::

sREMhws$c Ilc5 d.

. ;;;cs:. r x y ::xc: mu::;;, :ccecnieuxu A n / .e -

==. T q=_==um==mm===mammQ t".'_".__.

==r====='===ni gu3_. _ A__ m mmm, s c <650 <e50 M 8 b m n==nu===m eihm Nws3 pMmunwmmmnfN9mmng 9 unmunantmuo s \\ <650 <6SO <650 refL d%,, eMr crr-eh -mm= nundSdhu b 3 pw ._c650-4 50 . <650_ _ _<s50 4850._ Iround Floor -err w Natatt

1. -47% of the channel tron were scanned. p scan results (in cross hatched area) ranged from 15 cpm to 69 cpm.

2. The values provided are the approximate locations of fixed measurernents taken. Two minute (cp2m) fixed p readings were taken

- every 5 meters (total of 30 readings) using a 15cm2 detector. The maximum fixed measurement results was <650dpm/100cm2 (MDA). 3.1 exposure rate measurement was taken. Result was 7 pR/hr. 4 Allmetalsurfaces, it65.vsd )

i Figure 66: East Will. Scan & Fixed Mitsurrmint(s) t East Tower i k 7 -- a s_ 15 - 68 cpm p Scan \\y x_ s_ / L s_ 26' l u 1r s- <907 N c., / l i x-s. l l<907 j <907 l l l j Ground Floor . h b rr e 4 ) N tem i

1. -30% of the channel iron were scanned. p scan results (in cross hatched area) ranged from 15 cpm to 68 cpm.

4

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed p readings q

were taken - every 5 meters (total c! 5 readings) using a 15cm2 detector. The maximurn fixed measurement results was <907dpm/100cm2 (MDA).

3. All metal surfaces.

.vsd l l l 1

Figure 67: West Wall. Scan & Fixed M;asurement(s) t West Tower r v v y ~ ~ se q ~ \\. / ~. 15 - 56 cpm p scan 1 42' M%EMAWhwhMEhWhMM9EhW% ...y. . L_. 4 - ELEC . SOX, 26' N r_. i <907 .a cQn7 A N 17 T_ <907, 17 -56 cpm p Scan x e y k N / F E _r; _.. ""' ' i.h >/ ., _\\ num s ..~ l/ \\ I '907 con 7 7ss m

m. mss s7 ss ssssss m m s m m s m m s s-s m s sss ssssm, Ground Floor vvvvvv(

1 y are

l l

Notes:

1. -30% of the channel iron was scanned. p scan results (in crocs hatched area) ranged f:om 15 cpm to 56 cpm.

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed p readings (total of 7 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

3. All metal surfaces.

I ttS7.vsd l l l

Figure 68: East Tower. (North side wall) Scan Results East Tower, North Wall i E N j / / 18 cpm - 63 cpm $ Scan 7.._..__.._...._;______ / s A ./. 'N' L N 60' l Hnin;

1. -30% of the channeliron were scanned. $ scan results (in cross hatched area) ranged from 18 cpm to 63 cpm.

2. All metal surfaces.

. It68.vsd

.=. _.-.~.. Figure 69: Erst Tower. (South side will) Not Accessible i l' i i I l t East Tower, South Wall i ( 85' ./. l l l l / .N 60, t x =: l I i NOTES:

1. Not Accessible.

2. All metal surface.

tt69.vsd 6 i - l

fL ( Figure 70: East Tower. (East side wall) Scan, Fixed & Removable Contamination [, f East Tower, East Wall f 1 85' s Q { sNa / \\s/ a p 20 epm 55 cpm p Scan . es. w Z e:"' N ( _....N( ~ 60' Not b. as: 1 30% of the channeliron were scanned. p scan results (in cross hatched area) ranged from 20 cpm to 55 cpm. f. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed 2 readings were taken - every 3 meters (total of 4 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

3. ' The number in the circle is the approximate location of a wipe taken (removable measurement).

Wipe results p is <10 dpm/100cm2 and cis 12 dpm/100cm2. 4. All metal surfaces. tt70.vad r

-.. ~... - _ _.... _ _ _ _._. _ _. _. __._ _. _ _.-_ _. _..._ ___ _. _.._., _._m.._ _ _ _. __ 1 Figure 71: East Tower. (West side wall) Scan, Fixed & Aomovable Contamination I h b East Tower, West Wall i 85' k 3 = b I O b b-t l l / b b <907 22 cpm 58 cpm p Scan j -. - _ _ - _b _ <907 <907 ...907.... b............ 7

- h%%Nm x 60, i

Accessible side onif soies: l

p. -15% of the channeliron were scanned. p scan results (in cross hatched area) ranged from 22 cpm to 58 cpm.

$ The vilues provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed $ readings were taken ' (total of 4 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA). 9 The number in the circle is the approximate location of a wipe taken (removable measurement). l Wipe r:sults p is <10 dpm/100cm2 and a is <10 dpm/100cm2, t y Only ons side of the west wall (right side) was accessible, i ) All metil surfaces. l . tt71.ved i ?.

V Figure 72: West Tower (North Wall). Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) West Tower, North Wall h x-85' panels to 9'- 82' Match Exist. s N - + 1 h 19-45 cpm p scan ,y... 1 / IQ9) (Q 2 p a h m m m wenxwxxm(w) m m m m mxxN Q4 fo m N s 60' L ,b <907 8 R/hr = 27 0' Notes.

1. -30% of the channel tron were scanned. p scan results (in cross hatched area) ranged from 19 epm to 45 cpm.

2. The values provided are the approximate locations of fixed measurements taken. A one minute (cpm) fixed p reading was taken (total of 1 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

3. The number in the circle is the approximate location of a wipe taken (removable measurement).

Wipe results p is 13 dpm/100cm2 and ct is 17 dpm/100cm2

4. 1 exposure rate measurement was taken. Results was 8 R/hr general area.

5. All metal surfaces.

E tt72.vsd

..=... _ - - - -. -. - ~.. _. I l I l (. Figure 73: West Tower. (South wou) Scan, Fixed, Removable Contamination & Exposure Rate Measurement (s) l l l t l l West Tower, South WaN l l 85' b 22-61 cpm p scan t _........b... _.. @.... ~.........@..... _... @............, ; .........@............... _. _.J.. _10 RV <907 l A........_ _ @.... .... _b b b, b b l. / 'N' i 60, t x i i Notas. 27 0"

1. -30% of the channeliron was scanned. $ scan results (in cross hatched area) ranged from 22 cpm to 61 cpm.

2. The value provided is the approximate location of fixed measurement taken. A one minute (cpm) fixed p reading was talum l

(total of I reading) using a 15cm2 detector. The maximum fixed measurement result was <907dpm/100cm2 (MDA). t

3. The number in the circle is the approximate location of a wipe taken (removable measurements).

Wipe results p is 67 dpm/100cm2 and a is 21 dpm/100cm2 4.1 Exposure rate measurement was taken. Result was 10 pR/hr general area.

5. AR metal surfaces.

tt73.ved - i i-4 I I \\ l l i

Figure 74: West Tower, East Will. Scan, Fixed, Removable Contamination & Exposure Rite Measurement (2) ) West Tower, East Wall I-37-50 cpm p scan 7 g R$ -N o )@ e <907 10 RMr - _o,--- _ _ --_/_ - oN e efe i .......e............N......t._...._4...............e........... L e /e eN e / e eA -Q 7,1)- IfEh w t a 1 27'0" NQtBS.

1. -30% of the channeliron was scanned. p scan results (in cross hatched area) ranged from 37 cpm to 50 cpm

2. The value provided is the approximate location of fixed measurement taken. One minute (cpm) fixed $ reading was taken (total of 1 reading) using a 15cm2 detector. The maximum fixed measurement result was <907dpm/100cm2 (MDA).

3. The number in the circle is the approximate location of a wipe taken (removable measurement).

Wipe results $ is 54dpm/100cm2 and a is 21dpm/100cm2. 4,1 cxposure rate measurement was taken. Results was 10 R/hr general area.

5. All metal surfaces.

It74.vsd 9

f~ l l l [- Figure 75: West Tower. (West side wall) Not Accessible for Scanning i. 1 l West Tower, West Wali 1 85' k ~ ~ M s_ a / s s / ~/ 2-Corrugated Translucent s s c panels to + 82' 0' Match Exist. l f3 .d1g--... l -..._s___ s l l l N 60' ( 3 w_ 7_ l. j l l I l l 1 i NOTES:

1. Not accessible for scanning. Unable to position the boom lift to the west wall safely.

i tt75.vsd t 1 i fig 75.vsd i'.

~ Figure 76: Outside, South Metal Wall. Scan Result 3 Peotes.

1. -50% of the weR (2 meters up) and ground surface were scanned. $ scan results ranged from S70 cpm to 843 cpm on the wens and 1029tprn to 1287qwn on the ground surface, using a Ludlum Model 2221 relemeter and a 432cm2 beta gas Row proportonal detector

2. The values prowded are the approximate locetons of measurements taken.

3. All metal surfaces Rollup Door Rollup Door 8*1 post Reseg secczyn s37com 72ectra ilesespn 731com e23com 843 cpm 70ecom a 700com 721em 700m m e45com ,,7, esscern 771cer. e41com 950com 632com 70ecem ,, p ee7com 723com 7escom es2com 670com 711 e 602com 7eecpm e34com 803pm 72eem 602com ese:grn 827com 752com 007cqwn eere pg 740com eseem estcsyn estcom e20com ese:pm se2com sescem 60egro esse m e10com 7e0com 722com 1103com 1287 cpm 10escem t103com 1130com 1081com 1123cgyn tegeser Anscoig 102ecom 1142com 10escom 111ocpm 10eacom 104ecom pg 1074cqwn 10eenpm Outside Ground saiscom 107tcom 1150com 1157com 123ecom 1140com I tt76vsd

Fig re 77: Background NiasureMts Ou'tside Building (35,; ~ Notes. 1. Backgrounds were performed at Building 35-1 (shipping & receiving) for comparison on outside metal and outside concrete surfaces at Building 35 (T 2. The numbers circled are approximate location of measurements taken. Two minute (cp2m) fixed $ readings were taken - every 3 meters (total of 16 re using a 100cm2 and 434cm2 detector. 3. All metal and concrete surfaces. O e NI i l i i X l I I I l l l CP2M CP2M l 434cm2 totem 2 434cm2 te9cm2 1 2ssa 73s 12 issa ase 2 2s47 elo 13 1291 43s 3 resa 904 - 14 1331 417 O 4 3039 ose 15 ines 4o2 b b 5 mess oss 16 12s7 44 6 assi to34 h 7 2123 734 8 tes2 roo 9 io4s 744 m.m.m; 10 tes4 e4e tin vie 11 1s54 e73 -0 2

Figure 78: Fixed Measurements on tha Outside South Metal Wall (100cm2 d:;tector) E / j' / /,/ N+ 7' S ~ / ll / NOTES.

1. DR = Direct Reading

2. Cp2m = Counts per two minutes

3. Readings were taken on the south wall 1 meter and 2 meters above ground - 3 meters apart results using a Ludlum model ratemeter with a gas proportional detector (100cm2).

4. Maximum results in dpm/100cm2 were < MDA (<139dpm/100cm2)

) x x m rt T,L , / u t ,,f[

*] -

[ 's /[ I f - e m.w , p -- i / / / z. ~ ~ ~ - DR 501 cp2m metal,_ 1*f .Y m4 7 tt78.ved l

.- ~. -. - -.. - -. i l . Figure 79: Fixed Measurements on the Outside South Met:J Will (15cm2 d;tector) l E a f i / s / l; N / s I s l / l / NOTES. f. - 1. DR = Direct Reading i ./

2. Cp2m = Counts per two minutes

/. ? y

3. Readings were taken on the south W

wall 1 meter above ground -3 meters apart. Numbers are results i using a Ludlum model ratemeter with - a shielded 15cm2 pancake GM detector I S. Maximum results in dpm/100cm2 were i <MDA (< 650 dpm/100cm2) l l l x x D / l JA .f 7~ >g_ / / / / g DR 74 cp2m Highest Readmg v a l m.nen ( 4 i tt7s.ved 4

Figure 80; Fixed Measurements on the Outsida Concreta Pad (base of tha south w;ll) L E' l ./ ,/ N.<- l S + l ,/ l / [ f NOTES. /

1. DR = Direct Reading W

2. Cpm 2m = Counts per two minutes L

3. Readings were taken on the south side metal wall, concrete & asphat surfaces at the base -3 meters apart. Numbers are results using a Ludlum model ratemeter with a shielded 15cm2 pancake GM ostector.

5. Maximum results in dpm/100cm2 MOA.

See below for MDA results l l \\ \\ I i=[ f f - d / - on is,w %, m l. DR 180 cp2m concrete smewinnen bon in.ai. ) wo,wie m / / z 4 / / z-..._=__ _ m -=, woo.,wim.,, I i-tt90.M I i m

Figure 81: Fixed Measurements on the Outside Ground Si rtce (-2m from south w;ll) E .,, ? l ( / / ,/ N +- -y r S p / f NOTES. /

1. DR= Direct Reading 4

2. Cp2m= Counts per two minutes W

3. Readings were taken on the south side ground surface 2 meters awsy from the building on the surface -3 meters apart. Numbers are results using a Ludlum model ratemeter with a shielded 15cm2 pancake GM detector.

5. Maximum results in dpm/100cm2 were

< MDA (<970dpm/100cm2) / j/ \\ \\ / tr b /__ m. / / / m in span / ./ / 7 DR 178 cp2m concrete

,7 J-mm

/ /.. -..... -. '. .' m m cien e it81.ved I

. -.. ~. Figure 82: R: movable Contamination Survey on th2 Outside South MItal W ll E ,/ l / N <- -> S l / / r / / NOTES. j /

1. Numbers in circles are the i.

approximate location of smears A taken on the South outside metal W wall.

2. Smears taken -3 meters apart.

3. No contamination detected (all results Beta < 10 dpm/100cm2 and Alpha < 10 dpm/100cm2).

I l \\ \\ --O f / / 6 M 7 @// 7s / 7e O j y e / k I tts2.vsd I

i t Figure 83: Exposure Rita SurvIy Outside ths Building (South Side) i E. i .e ,/' I ,./ 1 l N s + ~ .+ l /-S l l ? f l .s i W NOTES. l

1. Results are in R/hr using a Ludlum Model 19 micro R meter.

l

2. R readings were taken at 1 meter above ground and -3 meters apart.

~

3. Highest reading is 13 pR/hr i

\\ \\ t O / 4~ \\ /~ /,,,_,e -g / y / un v. tamm Highesi m 12ph IIMD / sum j 11ph n tt03.vsd j l l l

4. _...... _ _. m_. i j Figure 44: Roof. Removable Contamination t 2 7 T E i i n<. ..V:. - >s t W, i w r I I + i p. /7 \\ / / .Ww 3 1 ,T l l / O(!... t .I i i l MalaL

1; The number in the circle is the approximate location of a wipe taken (removable measurement).

Wipe results $ is <10 dpm/100cm2 and a is <10 dpm/100cm2 i l

3. All rmetal surfaces.

It84ud.vsd i l I I ) l.. 1 3 l

Figure 85: Outside North West Comer Concrete Stab. Scan Results on hm side N A .fg, ll l ! l W E Asphat j', / / / / / /.// surface v v ow m a. / s~ /,181,0( / f // / l/ A 'l // / \\ 2,015, cpm.$,sc,an.- Up _- + . ' / / ,7 ,s l / 'l// /j/ l /,! /- ' / hfechanical Shoo 1565 - 1790com p scen j /1630 190Scpm pscan 0" M / 1385 /,/ Asphat //j' / / :'7l/ - ) 1570cpmfsca, / ll/ l /,, / l j,' ll/ /. -/ /

gh--

-- lLockedDoors l -- Boup --- Trou t Ground Floor Notes:

1. -100% of the north west side comer concrete slab was scanned. p scan resuts [n cross hatched area) ranged from 138Scpm to 2015 cpm.

2. All concrete surfaces.

tt85.vsd Rollup Door Rollup Door

N Figure 86: Ground Level Confirmatory Survey. Scan, Fixed & Removable Contamination 4 W4 E Y s b A B C D E F G H I J K lL M 9 to** ~ U 1 72s h) ~ ~ ~ ~ z x y x N px 'N \\ * * \\x x 'z x y, sc3o, N~'\\gbg, sos,ks xix , s2aow' mens.\\ g3s'('N x \\ ; \\ 'N<301~ ' y" -i "7 N' x'N 'i. ~ 2 x ' s N+!.N.....N NA N st N 'N 3 \\ s. 0 o..v.e,_r..m.,,e._ex,9s...,s . x ix N N;\\s xss, ,..N.%..N. x%.x. #..y u _._x..,_.i.s _' s_os. % .. a3 NNpj\\ s! x .x s v.. s 's x8tscom to20sicom p scan x [\\'x 'l N e43 IN ' \\ N!N\\ Ni N'Nlx NN <30M 'N\\ \\ A xNKx

N h '\\ ' C's N K;x x x N x 1' dh]caYN s'ti 3

s ' S 's' s ',. ps Ny x x x( N N ,s N N%s. T Np \\4 NN x ' g i 336 s 1 \\fN s ' '. , N h N N(, N NNNN'-Q'N x.{'N x N \\ 4 's 'd. ('N;N \\ [\\ 'N \\ N e".~7Vs X{\\QN N fx N N ; x)\\ s N N N N N;N x N s 3 s ' x '; 338 y :r?c v vK N 'i sc+c+ vNiv ig N x; \\ <x x N

p 337 *N 1., x s; N N s.

-s y x;

x
s is 'N x N 'x'i'x x NN4xN Nistscomyzoeicom e scans \\x 5: r. ' N Fs Nx NI s

x 4p x;N..y :3..h g{.,'N'N.q}.y N.4gs N v. x_w;.g. g_:v.. N 'N N \\ 'N N s 5 's,.g. N x s. x 4, x,.%.a g x. 6 Large Rottup sman i Door RORup Door I ( ._..y. +-e. Notes: i i 2 Meters i =

1. -100% of the floor was scanned. p scan results (in cross hatched area) ranged from 816 cpm to 2061 cpm.

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed D readings were taken. (total of 11 readings) using a 100cm2 detector. The maximum fixed measurement results was 1044dpm/100cm2 (MDA for concrete surface is 301dpm/100cm2)

3. The number in the circle is the approximate location of a wipe taken (removable measurement). Wipe results p is <10 dpm/100cm2 and a is <10 dpm/100cm2.

i

4. All concrete surfaces.

ttB4.vsd

1 7--_- Figu e 87: Ground Level Confirmatory Survey. Fixed Measurement (s) N A W4 >E Y s A B C D E F G H I J K L M i se r..up..r. i . m. v..e Lj U-w.... . < un i Tro.ph I l I ( 1 I A 2 <1432 <1432 <1432l <1432 !c1432 3 1432 <143 3 <i4 2 i 4 Not to scale 4 --t + 5 l ^ -v 6 Large nonup Cww Door de { = 2 Meters Notes.

1. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed S readings were taken (total of 20 readings.

12 measurements in trough and 8 measurements on ground floor) using a 15c n2 detector. The maximum fixed measurement results was <1432dpm/100cm2 (MDA). 2. All concrete surfaces. It87.vsd i 6..

N Figure 88: 9' Level Confirmatory Survey. Scan, Fixed & Removable Contamination. a W E NTv 5 A B C D E F G H I J K L M =- I i i 1 W'f' WaII =-

-

- ~,,,,,,, ,,g,,k Stairs Q ,,,{ Stairs l.' Floor.i 2 Wall / wagg ', l/V///dl// ' l, Y'. fV//y M 3 l l 7 k 7 87 508 cpm to 867 p scin# l I' I' 536 cpm to 86 l 1 scan / 4 l U l l 1 1 l l l l Bay Area l l I L I + t____ 1 _ _ _ _ 4 -- - 6 l Large RoHup ww l Door Door I' i = 2 Meters Notes.

1. -100% of the floor was scanned. p scan results (in cross hatched area) ranged from 508 cpm to 867 cpm.

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed readings were taken. (total of 4 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

3. The number in the circle is the approximate location of a wipe taken (removable measurement). Wipe results p is <10 dpm/100cm2 and a is <10 dpm/100cm2 4.

All metal surfaces. it88.vsd k . m

N Figura 89: 1T Level Confirmitory Survey. Scan, Fixed & RLmovable Contamination. A M1 w E NTv s A B C D E F G H I J K L M 1 WaII wan /j','j'///y//,,.{/'/s'sf' / i U \\ ) l)1"' l 3 l l'"' <,r,/pb66 MP*4'09 8 'lC8Pi/I l l j j _._.L_ j j 4 ay Area Bay Area we ; l l k_ d2-II t _ m. 6 l Jargenonue-4 saamm l I Door Door 1 __ j i l = 2 Meters Notes.

1. -100% of the floor was scanned. scan results (in cross hatched area) ranged from 500 cpm to 1014 cpm.

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpra) fixed p readings were taken. (total of 4 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

3. The number in the circle is the approximate location of a wipe taken (removable measurement). Wipe results p is <10 dpm/100cm2 and a is <10 dpm/100cm2 4.

All metal surf aces. ItB9.vsd

N h Figira 90: 26' LSvel Confirmat:ry Survey. Scan, Fix:d & Removable Contaminati:n. w4 >E V S A B C D E F G H I J K L M 1 Wall wari / j WMWFJsd3 / / l MW24CdM ~ l l MW6MM ~ ' - g____ ~ / / / / / /_/ > / /i/ / / 1/ / / /1/ / / /2/ i / 6 y Large RoNep L = 2 Meters Notes.

1. -100% of the floor was scanned. scan results (in cross hatched area) ranged from 493 cpm to 989 cpm.

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed p readings were taken (total of 4 readings) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

l

3. The number in the circle is the approximate location of a wipe taken (removable measurement). Wipe results is <10 dpm/100cm2 and atis 16 dpm/100cm2.

4. All metal surfaces. r tt90.vsd ~.

~ N Figure 91: 34' Level Confirmatory Survey. Scan, Fixed & Removable Contamination. w a s s b b \\ \\\\\\\\\\ \\ r i i h,,.NWB 7 ' ' ' ' '~;c c: x,';e v ;;c':: ';;c'z w ;;;'; c N s s s s s-s sss s s s s s, s s ss x r -4 t' M

1. -100% of the floor was scanned. $ scan results On cross hatched area) ranged from 301 cpm to 888cptn

2. The values provided are the approximate locations of fixed measurements taken. One minute (cpm) fixed $ readmgs were taken. (total of 2 readogs) using a 15cm2 detector. The maximum fixed measurement results was <907dpm/100cm2 (MDA).

3. The number in the circle is the approximate location of a wipe taken (removde measurement). Wipe results $ is <10 dpm/100cm2 and a is <10 dpm/100cm2.

4. All metal surfaces. tt91.vsd a.em

i il l r m 1ll t \\ \\ N m E 2 ? Iii mc VVS 0 NL m 0 J 1/n ) r W g s o 0 d 1 a m IIt r is e 2 a fo dn la a t v Iii k 0 o 2 t m ( n c e 0 a 1/ t m e r p e d w 0 s 1 g o d is m e S e s r r IiI p ltus d e e r x e m i p f ) i m W p ). cA (D ) t m IiI te n M e u in (2 me mm ru e c s n0 a m O1 e 0 t ./ m vb a nm m ep le m kd b a7 a a t Iii t 0 v n s9 o n< m t o C e s e le ma r ( ew n r a us e v slt k o au a t m es e mre e m p R IIt dt iw n e e a 7 ix m d 0 f f e 9 f e o x oru n F m i T. ss io na \\ ee a t ye t m c v a o cd l ru A l IIl lo e e S [ t x y ei a m m f r tam m i o x t u o a m ixm p r oi ir l l r x p f. pa a i pm e u m l r hh is a C h ee t e T. t ve e e L r r lc ao t r m dc ic 2 QY1 ete 4 de e s l h e ivd 2 t c 9 o2 in a r f e pm r r u ru s c e s n g e5 b i u1 m l d a F laa u e s t v n m v. g 2 en e ll 9 nTu hi h s T A tt a m1. 3. 4. ( 1I

f APPENDIX A RESULTS OF THE CHARACTERIZATION SURVEY [ PERFORMED AT BdlLDING 35 (TEST TOWER)' ( ( l l Prepared By: Stephen Finchum, Laura Gonzales and Scott Cowan September 15,1997 mu

[ Table of Contents List of Fig ures............................................................ i (. Ust of Tables....... ...................................................ii I ntroduction.............................................................. 1 History of Use ...........................................................1 Summary of Surveys Performed ......................................... 1 s S um m a ry of Resu lts...................................................... 2 [ 4 L ( L L r r i __j

F List of Flaures Fiaure # Descriotion Figure 1: Drawing of Building 35 (Test Tower Facility).. .3 Figure 2: Scan Results on the Outside South Metal Wall. .. 4 Figure 3: Background Measurements Outside Building 35-1 .5 Figure 4: Fixed Measurements on the Outside South Metal Wall (100 cm detector). .6 2 Figure 5: Fixed Measurements on the Outside South Metal Wall (15 cm detector).... 7 2 Figure 6: Fixed Measurements on the Outside Concrete Pad (base of the south wall)..8 Figure 7: Fixed Measurements on the Outside Ground Surface (~ 2m from south wall) .9 Figure 8: Removable Contamination Survey on the Outside South Metal Wall 10 Figure 9: Exposure Rate Survey Outside the Building (South Side).... 11 Figure 10: Scan Results in Mechanical Shop. .12 Figure 11: Fixed Measurements in the Mechanical Shop 13 Figure 12: Exposure Rate Measurements in the Mechanical Shop 14 Figure 13: Masslin Survey of the Ground Floor...... 15 Figure 14: Exposure Rate Measurements on the Ground Level. .16 Figure 15: Detailed Survey in the Trough (Ground Level).. ... 17 Figure 16: Measurements in Trough located on the Ground Level 18 Figure 17: Characterization Survey of the 9' Level.. 19 Figure 18: Characterization Survey of the 17' Level . 20 Figure 19: Masslin Smear Survey on the 26' Level . 21 Figure 20: Characterization Survey of the 26' Level .. 22 Figure 21: Characterization Survey of the 34' Level.... . 23 Figure 22: Characterization Survey of the 42' Level . 24 Figure 23: Characterization Survey of the 50' Level .25 Figure 24: Survey of the South Wall Edge of Bay (26'-53'). ... 26 Figure 25: Survey of the South Wall Under the Small Rollup Door (26'-60') .. 27 Figure 26: Survey of the South Wall (26'-60')... . 28 Figure 27: Removable Contamination Results on the South Wall-High Bay Side .29 Figure 28: Removable Contamination Results on the South Wall.. . 30 Figure 29: Survey of the East Wall (26'-60'). . 31 Figure 30: Removable Contamination Results on the East Wall . 32 Figure 31: Survey of the North Wall (9'-75') 33 Figure 32: Survey of the West High Bay Wall (Ground to 26' Level). . 34 Figure 33: Survey of the West High Bay Wall (26' to 85' Level) .. 35 Figure 34: Removable Contamination Survey of the Hoist (88' Level) . 36 Figure 35: Removable Contamination Survey of the Fan (88' Level) . 37 s i 1

I h List of Tables r. Table 1: State of CA's Acceptable Surface Contamination Levels............... 38 Table 2: List of instruments............................................. 39 Table 3: Background Measurements ................................... 40 ' Table 4: Results of Characterization Surveys Performed...................... 41 l [ ii f l

L introduction This report summarizes surveys performed to characterize current radioactive contamination p levels in Building 35 (Test Tower Facility). A drawing of Building 35 is shown !n Figure 1. The L main portion of the building is about 69.5' long and 28' wide (1946 ft ). It is a!so about 85' tall. 2 The building is constructed of concrete (ground level only) and corrugated metal walls and metal stairs and mezzanines. A mechanical shop is located in the northeast comer of Building 35 and is 41' by 15' (615 ft ). The totalfloorarea /s 2561 ft'. 2 { History of Use The Test Tower was used in the 1970's and 1980's for work involving helium circulators from [ the Fort St. Vrain reactor facility in Colorado. These circulators were retumed to GA by the Public Service Company of Colorado for repair and maintenance. Typically, the circulator would be brought into the building for storage and disassembly. In October 1981, an event [ occurred which caused an airborne contamination incident inside the building. A review of the Radiological Safety Condition Report written after the incident showed contamination occurred in alllevels of the building. The highest contamination levels were measured on the 26' level of [ the building. Other levels, such as the ground and 17' levels also had elevated levels of contamination. Decontamination of accessible surfaces took several weeks after the event to complete. Summarv of Surveys Performed ( The Characterization Survey of Building 35 (Test Tower) was performed in accordance with written survey plans. The survey characterizes radiation levels in the main portion of the [ building and the mechanical shop. Some inaccessible areas inside the building and the roof could not be surveyed at tnis time. [ The survey included scanning of the floor surfaces of most levels of the building, collection and analyses (by gross alpha / beta counting) of smears from floors and walls, collection and analyses (by gamma spectroscopy) of debris and paint samples, fixed measurements on the ( floors of most levels and walls, exposure rate ( R/hr) measurements, and scanning of various surfaces using floor monitors. A summary of the number of smears, pa'nt chip samples, debris samples and fixed measurements taken is provided below: Building 35 (Test Tower) Characterization Surveys { Smears Paint Samples Debris Samples Fixed R/hr Measurements

- S""'

f 625 25 17 216 37 1 1 e s r

Summary of Results Table 1 provides the State of CA " Guidelines for Release of Equipment and items to Unrestricted Use". Table 2 provides the list of instruments used during the characterization of ) this building. Table 3 provides the background measurements taken at Building 13 (an office building on GA's main site used previously for background measurements) and at Building 35-1 (a building located northwest of building 35). Table 4 provides the results of the scanning, fixed measurements, smears, sample analyses, and exposure rate measurements taken during characterization and Figures 1-35 provide the locations and, in some cases, the results of various measurements. No contamination was detected in normal walk areas of the building determined to be the highest potential areas (the ground and 26' levels) as determined by large area masslin smears taken on these two levels (see figures 13 and 19). Low levels of removable and fixed Cs-137 and Co-60 contamination were detected on many horizontal surfaces within the building but levels were below the release criteria in all but one location on the ground floor.' Contamination on the ground floor was found inside a concrete trough located along the north wall of the main portion of the building and is about 12" wide and - 5" deep. The contaminated portion is about 3' long by 3 to 12" wide within the tough, west of the double doors (see Figures 14,15 and 16). Two other areas had elevated /evels of radioactivity (> 3000 dpm/100 cm fixed contamination 2 2 or > 600 dpm/100 cm removable contamination) and will be cleaned during the decontamination phase of the project. One area is on the 17' level (in the seams between the metal) as shown in Figure 18 and the other area is on the 26' level (also between the metal seams) as shown in Figure 20. Paint and debris samples were collected and analyzed by gross alpha / beta counting and/or gamma spectroscopy. The results are provided in Table 4. About 30 cm area of paint was 2 removed, although the actual values varied slightly for each location. Results show very low levels of Cs-137 and/or Co-60 on many of the samples. Removable contamination surveys and fixed measurements were taken on the walls and horizontal surfaces of the I-beams and channeliron attached to the walls. The results showed . some low levels of contamination but the levels were below the release criteria. No contamination was detected outside of Building 35. The outside surveys were limited to the south outside wall and the concrete / asphalt area outside on the south side. This wall and the surrounding outside area had the highest potential for contamination because the helium circulator was brought in through the roII-up doorlocated on the south side of the building. Measurements included removable contamination surveys, fixed measurements and exposure rate measurements. A soil sample was collected outside of Building 35 (at the end of the trough). The result (analyzed by gamma spectroscopy) showed Cs-137 and Co-60 contamination but the concentrations were very low (see Table 4) and well below soil criteria previously approved for the GA site by the NRC and State of CA. An exposure rate measurements (pR/hr) taken at this location was at normal background levels. l

E- ' Figure 1: Drawing of Building 35. (Test Tower Facility) u / / / N<- ,A. > s / / / //< ,/ i., / ~W i: -85'0" l / a/ / / / v l ) / / ,:v ,/ ,/ ~28'0" l t !^ I + i i 1T1.vsd ) 4 t l 3 l ) I t . - ~. -.,

1 i umum umum uma ums ' m M Figure 2: Scan Results On the Outside South Metal Wal: Notes.

1. The south metal wall and the ground were scanned using a Ludlum Modei 2221 ratemeter and a 432cm2 beta gas flow proportional detector

2. Readings are the highest reading in epm noted in that location during scanning.

3. 5J% of the outside wall were scanned and 50% of the outside ground surface were scanned Rollup Door Rollup Door FWghest Reedng 640com 637com n6com 696com 731com 623com 843 cpm 706com a

700com 721 cpm 700com 666com 725 cpm 697 cpm 641com 656com 63amm 706com 717com 697com 723com 765com 652com 670 cpm 7ticpm 602 cpm 766 cpm 63 % 693 cpm 726 cpm 602 cpm 656com 627com 752com 607com 66Scom g 66 5 740com 656csm 691 cpm 661 cpm 620com 666 cpm 562com 595 cpm 606 cpm 652 cpm 610 cpm 760com 722com '1103com 1287 cpm 1066com n 105 5 1103com 1130com 1061com 1123com teghest Remeng 1029com 1142com 1069 cpm 1114 cpm 1062 cpm 1046 cpm Qg 1074 cpm 1064com Outside Ground 12tscom 1071com 1150 cpm 1157 cpm 1239com 1140 cpm TT2.vsd 4

{l K 9 s 7 2 4 M 8 3 1 0 1 3 4 4 4 4 2PC a 1 1 s 7 s 9 3 s 6 s 2 3 2 2 i 1 1 1 1 2 3 4 5 6 1 1 1 1 1

== na =^ ~ 2 m 4 8 o 4 9 3 3 4 0 4 9 3 e 3 t 0 8 8 3 0 4 4 7 M o 7 9 9 9 9 0 7 7 7 6 s o 1 2 1 P 2 C m 2 7 3 e 3 1 3 2 5 4 4 c 9 4 9 3 8 9 2 6 4 6 s 3 8 8 9 o 9 9 1 9 9 9 9 2 2 2 2 3 2 2 2 1 1 1 1 4 0 1 1 2 3 4 5 6 (7 8 9 1 1 ) 1 T -53 ( gn 5 id l l iu B 1 l e d I l is tu O l s tn: I j m l e rusae I Q M l d r O I N nuo d e IX@ g s v. kc 3 a T B T

3 N@

rug iF

l Figure 4: Fixed Measurements on the Outside South Metal Wall (100cm2 detector) / / NOTES: /

1. DR= Direct Reading

2. Cp2m= Counts per two minutes l-

3. Fleadings were taken on the south '

j wall 1 meter and 2 meters above ground - 3 metars apart.

4. Numbers are results using a Ludlum model ratemeter with a gas proportional detector (100cm2).

5. Maximum result in dpm/100cm2

< MDA (<139dpm/100cm2) E DR 216 cp2m 2m U" ' 8 ** * "" / 43e epam maat p/ ,/ >R 379 cp2m 456 cp2m meal R 465 cp2m metal N S on,,,,,,,,,,,, ,,3,,,,,,,,,, DR 453 cp2m meta p DR 501 cp2m metal / 1* 4 DR 464 cp2m metal 4 DR 415 cp2m metal l W TT4.vsd 6

Figure 5: Fixed Measurements on the Outside South Metal Wall (15cm2 detector) NOTES:

1. DR = Direct Reading

/'

2. Cp2m = Counts per two minutes

3. Readings were taken on the south wall 1 meter above ground ~3 meters apart.

4. Numbers are results using a Ludlum model ratemeter with a shielded 15cm2 pancake GM detector

5. Maximum results in dpm/100cm2

<MDA (< 650 dpm/100cm2) E / >f-- / 7 ,/ N S / g DR 74 cp2 ighest Reading x-W TT5.vsd 7

! Figure 6: Fixed Measurements on the Outside Concrete Pad (base of the south wall) i / / NOTES: f

1. DR = Direct Reading

2. Cpm 2m = Counts per two minutes

3. Readings were taken on the south side metal wall at the base -3 meters apart

4. Numbers are results using a Ludlum model ratemeter with a shielded 15cm2 pancake GM detector.

5. Please see MDA results below.

/ --- h DR 138 cp2m Asphan (<833@m/100cm2) DR 180 cp2m concrete (<s70domn00cm2 +- DA 130 cp2m Mal (934@m/100cm2) / i N m um caem m w ***m"=c e S DR 154 cpJm concrete (<970dpm/100cm2) On 80 cp2m metal (<650dpm/100cm2) L / /: DR 160 cp2m metal (1402dpm/100cm2) W 8 TT6.vsd -

1 1 l Figure 7: Fixed Measurements on the Outside Ground Surface (~2m from south wall) i l t I 1 l ) l NOTES: / / /.

1. DR= Direct Reading 1

2. Cp2m= Counts per two minutes

3. Readings were taken on the south side ground surface 2 meters away from the building on the surface -3 meters apart.

4. Numbers are results using a Ludlum model ratemeter with a l

shielded 15cm2 pancake GM detector.

5. Maximum results in dpm/100cm2

< MDA (970dpm/100cm2) l I / E i j /..-..-.....- .4-OFI176cp2m Asphat c 2 / l p - DR 167 cp2m concree / / S ./,: OR its epam concrm. N

/-- DR 178 cp2m con ete

/ / OR 172 cp2m concrete .' on,62 enam.wm, j

'***"*c'

/ ./ i i . MDR 166 cp?m concrets = sm j l W i l- -TT7.vsd 9 I

I Figure 8: Removable Contamination Survey on the Outside South Metal Wall / / / / / / /' / NOTES:

1. Numbem in circles are the approximate location of smears taken on the South outside metal wall.

2. Smears taken ~3 meters apart.

3. No contamination detected (all results Beta 110 dpm/100cm2 and Alpha 110 dpm/100cm2)

/ E / /b 7e / e N S xn W / I TT8.vsd

Figure 9: Exposure Rate Survey Outside the Building (South Side) / / / NOTES:

1. Results are in R/hr using a Ludlum Model 19 R meter.

2. pR readings were taken at 1 meter above ground and -3 meters apart.

3. Highest reading = 13 R/hr

/ E / /uh '2 % i 4 ,,w M 13pR/hr / 12p w '~ ~ " " ~ "

N 12p m g

12pw /11pm BuRh l ~~ w i l 11 79.vsd

100% Scan Ranged From 1051 cpm-1354 cpm i-10% Scan i Ranged From 1079 cpm-1205 cpm 'Nk. Mechanical Shog F 100% Scan Ranged From 980 cpm-1216 cpm i Contaminated Trou 'S _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _g h j ' 'k'd(D j Trough / "I" Beam "I" Beam "I" Beam "I" Beam l Notes.

1. 100 % scan in the shaded area with a Ludum Model 2221/432cm2 detector floor monitor 2.10% scan in the non-shaded area with a Ludlum Model 2221/432cm2 detector floor monitor

3. The measurements are shown in range (minimum to maximum) results.

4. All concrete surfaces.

Rollup Door Rollup Door TT10.vsd 12 . __-- d

m w. a 855co2m k. 763cp2m - 781cp2m Figure 11: Fixed Measurements 715cp2m 1 - in the Mechanical Shop 793cp2m 758cp2m Y 821cp2m 716cp2m Mechanical Shop ~ 15'0" Soil SamP e 751cp2m l 725cp2m 78Cep2m collected ] 837cp2m Contaminat sd Trough l ' k'd D l Trough '8 i m_____ L L _U L "I" Beam 1 "I" Beam 2 "I" Beam 3 "I" Beam 4 5 Notes.

1. Numbers are the approximate locations and Results of Fixed Measurements (in Mechanical shop).

2. Two minute fixed readings were taken every -7 meters (total of 12 readings) using a 100cm2 Detector.

4. The maximum measurement (855cp2m) converts to < 206 dpm/100cm2 (MDA).

5. All concrete surface.

8. A Soil sample was collected outside of the building (North end).

Rollup Door Rollup Door TT11.vsd 13

up e i apausa natu meawremerHETTIneWRfCT)3f1TCET A i l BuRhr 9uR/hr 10gR/hr f 10uR/hr 12pR/hr. 12pahr 15 R/hr * / 12 Rhr* 9pR/hr 12 %r! 96Rtr DW 12 Rhr. 10aR/hr gg,gg,. 12 R/hr

9uRhr 11uR/hr 11uR/hr 11 Rhr-10uR,hr 12pR/hr
11 R/hr
11 Rhr
Mecham. cal Shoo 10uR/hr 10pR/hr 10uRhr 12 Rhr*

12 R/hr

12pR/hr
10uR/hr 9aR/hr 11 R/hr
12gRhr
Contaminated Trough jtockegooors i Trou u----

gh 1 L2Rw! 1 -a "I" Beam "I" Beam "I" Beam "I" Beam

Notes,

1. Exsposure Rate measurements were performed in the Mechanical shop.

indcates contact R/hr readings. All other readings were taken at 1 meter

2. Maximum results in R/hr = 15mR/hr at contact and 11 R/hr at 1 meter.

3. Readings taken - every 3 meters.

4. Maximum results are shown in bold lettering.

5. All concrete surface.

Rollup Door Rollup Door TT12.vsd 14

Figure 13: Mmslinn Survey of th3 Ground floor Mechanical Shop u = Masslinn Wipe & ID# N Contaminated Trough lLockef. Doors l Trough ~7 \\ '(-~g----~~--- "I" Beam f - /3 BearO / "I" Beam "I" Beam r ) A (- ,f f'l (' o y <Af N (j' b O &[] Q] ] J 'h5 D f,/ b(b (Q l u ('\\ W)N i ,i ,./ /.) \\ W N ) ,J',) )D f' 8 i \\ / t 7 ' 6: 5 k 3 '2 g/ 1 ~ ~' ) ( s ff ) J (J s }ic w / J w ('v, n / ) j / A y { ,/ ( ( }{' ~ (' ', '\\ 'm \\ ,/ \\ \\ Rollup Door Rollup Door All wipes were at s background levels. TT13.vsd 15

Mechanical Shop k Contaminated Trough 30 uR/hr(including background) E 8 to 10 R/hr outside Locked Doors !j( !No Activity detected ---(- ~ I "9 No Activity detected ,I, Beam "I" Beam "I" Beam "I" Beam 4 t k i Rollup Door Rollup Door 1 TT14.vsd 16

~ ~ m Figuro15: Detailed Survey in the Trough on the Ground Level Highest Direct Frisk = 1000 cpm /15cm2 (28,562 dpm/100cm2) Contaminated Area Highest Indirect (removable comamination) = 1000 cpm /100cm2 (4,395 dpm/100cm2) 8pR/hr 8 R/hr 10pR/hr 5 R/hr 30pR/hr r Enlarged Contaminated Trough /d ' CkyD 'Sl Trough 1 Q j 1 ~~~~~ -~~ "I" Beam "I" Beam "I" Beam "I" Beam = Debris Rollup Door Rollup Door TT15.vsd 17

Figure 16: Measurements in Trough located on tha Ground Level N ~ N 9w 1 2 3 4 30 R/hr 1000 cpm 1000 cpm /100cm2 I / 8 pR/hr / ) \\_ a - J N ~3' in the Trouah: W

1. Removable & Fixed Contamination area behind Beam 3.

E

2. 30pR/hr @ ~ 1/4" to 1" from ground inside trough.

3. Direct frisk 1000 cpm @ 1/4" using a 15cm2 GM detector. (28,562 dpm/100cm2)

4. Wipe result was ~ 1000 cpm /100cm2. (4,395 dpm/100m2).

TT16.vsd S 18 L

Ms m ( p x\\ Y c \\ 2 f '5 m r 'p o c t 7 c 3 e te d MG de N ldie hs 2 mc 5 1 1 / w2 1 22 ma m e m Ylu S d n ) a u 2 l '8 L m m 2 te e o a c c M c \\ 6 0 g f a 6 0 u\\ .\\ 1 n + 1 4 is / fr u m S n p a e d l k 7 te a 0 t 9 M e = r m e w A 9 M p 1 D c s 7 g M 3 in ( d 2 a m Tll m M e c le Y4 p r 0 v \\ e d 0 e \\ s e 1 L \\ x / m i '9 f \\ M e p e d h ili tu 7 t n 3 f im 9 o = M y e e n 2 v o m ru S d IlI d c n 0 e a 0 M io c m n t 1 dp / a le e c m t l n p iz o p, n in d C fIl c n n r a M lp e e c sw t i a e o lt m rh u ra a es se h S we M r C r t s a m n k

7 ia m

cs u e P a r u im d 1 t al s u = e c s x v. r mi S l e a 7 l g AR M l 1 F a T t 1 2 T e M l

1

\\ i L

Figure 18: Chrracteriz tion survey of the 17' Level err h h / V ) y <>m-4 )' s a e %'i Ni i i i i i 'si P"*"' *gb-y Q l' \\ '; \\ l \\,, 4 4 Q* k e Es i i Ki mer s Large Bay Area Small Bay Area 21T 41 7 Notes:

1. All cracks were scanned and one minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector. Results are shown in cpm.

V

2. Maximum result in dpm/100cm2 = 3500dpm/100cm2 in crack (MDA = 907dpm/100cm2)

= Vertical Surface Paint Sample

3. All Surfaces are metal.

= Horizontal Surface Paint Sample = Debris Sample TT18.vsd 20

Figure 19: Masslinn Sme:r Survey on the 26' Level N = eev = \\ \\ y h h '\\ Y('MWyN ' ) M # 2; M M x= c = msxmq r .\\ x x 'N w .1x X, Wj u L4 G ^ Mater 41 7

1. Approximate locations of Large masslinn wipes taken on 26* level.

2. All 16 masslinns were checked for Alpha and Beta Gamma radiation using the TBM-28 geiger counter and Ludlum model 12 alpha counter.

3. No activity was detected.

= Large area Wipes

4. All Surfaces are Metal.

TT19.vsd 21

Figure 20: Characterization Survey of the 26' Level ser N ' \\ os im mese e r s 2 65 cpm c,=my = g y \\[ \\ 10' o, \\y '\\'; N, s s s \\l \\ \\ C'"***

n. 4 y

\\ ~ 72 cpm "v h 7M 9 n n \\ \\ 7 9 9 w - k- \\ Scan = 220-240 cpm (with TBM 28) d ' ** ~ 3784 dpm/100cm2 a3 cpm N aws.-re h ""*"Y e __e t g' _ _ = m

1. All cracks were scannad and one minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector. Results are shown in epm.

2. Maximum fixed measurement results in dpm/100cm2 = 1593 dpm/100cm2 (MDA = 907dpm/100cm2)

3. Scan of metal crack floor (seam) - 3784 dpm/100cm2 Paint Sample

=

4. Debns gamma scan results shown Cs-137 and Co-60 Contamination.

@ = Debris

5. All Surfaces are Metal.

TT20.vsd 22

Figure 21: Characterization Survey of the 34' Level N s Ys F ((Cj'> s a A@ s I'%R \\ 62 cpm k\\ r N' 43 cpm N x x = Vertical Paint Chip Sample

1. All cracks were scanned and one minute fixed measurements were taken using a Ludium Model 2221 with a 15cm2 shielded GM detector. Results are shown in cpm.

= Horizontal Paint Chip Sample

2. Maximum results in dpm/100cm2 = 937dpm/100cm2 (MDA = 907dpm/100cm2)

3. Maximum Paint sample results in dpm/100cm2 = 53dpm/100cm2.

4. All Surfaces are Metal.

TT21.vsd 23

Figure 22: Characterization Survey of the 42' Level i i i i N r N 3 \\ 52 cpm l w \\ N N \\ s \\/ F / l 73 cpm ** Notes:

1. All cracks were scanned and one minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector. Results are shown in cpm.

2. Maximum result in dpm/100cm2 = 1281dpm/100cm2 (MDA = 907dpm/100cm2).

3. All Surfaces are Metal.

i TT22.vsd 24 t

N\\l :' l \\\\\\ \\\\ N .\\ N x \\xx IiI \\ l s lll o \\ \\ \\ Oo N lIi ,I x mPc 57 lII m ap iIi gc ) inn 2 s i m u n c w 0 n o 0 eh 1 n 5 k / s n 2 t e p io a t r a er a d in 7 e s 0 m le lIi wl t 9 a v u s t e s = n t L ne o eR A c '0 m. D 7 5 e o M 3 r r ( 1 t u c 2 s e se h at m C e e c t md 0 d f M 0 e o iIi d w 1 y eG 'r t o x r h e id f p s v e d c ed r 5 e u t l 7 p ue S ni 3 s ih n ms a 1 o e2 = m nm 2 m it z iIl m oc m a a 5 c g p d ir 1 e m c n 0 2 aa 0 y b t p 1 r 5 \\'4 dh / c d a c ei m e la t nw p z \\ \\ a 6 iT n d ly t a1 e IlI c e e s lp h c2 n a s2 i n M C m 2 lt a e e p rl u e r 3 a 2 8 wd e s o r m e e r '4 sM m a c d k u s a s \\ f mp [ 1 u aT cm m is r v. f mrlI a g r lu u 3 r lcd i b S 2 i x F p c s l u a e l T c 5 e AL M D A T l t 6 6 o 7 N 1 2 3 4. hm

Figure 24: Surv:y of the South Wall Edgs of Bay (26'- 53') 60' Level b _X s( l k Tnn HinH To F Af'H N l Os @-? j ~ w @s ""'" @ [ s, @s d 4 l l @s - 42' Level O 't e w w s S-? ~ w i. i g o_ e'y i s @Nl ~' { \\ x Bay rea ) i 26' LEVEL N . Notes. \\ s b 3

1. Numbers are the approximate locations of Fixed Measurements and 100cm2 wipes taken on South wall.

\\ 4

2. One minute fixed measurements were taken using a Ludlum Model 2221 with a 1Scm2 shielded GM detector,

3. Maximum Fixed Measurement result in dpm/100cm2 = <907dpm/100cm2 (MDA = 907dpm/100cm2) j

4. Maximum Wipe results.

= 16 dpm/100cm2 and a s10 dpm/100cm2.

5. All Metal Surfaces

=100cm2 wipe locat. ion and ID# 26 TT24.vsd

(. Figura 25: Surv:y of ths South Wall Und:r the Small Rollup Door (26' - 60') g.,_ A A A.,_ A-A 60' Level e u' ~ ~ ~ ~ ~ l Mcom PIkam I 40 cam escom l t i I~ sa-. oc-22 - 37com ~ \\ \\ ic .sc. 47c-e i s [ t 4.com @m @ s4 epm @ as.m s

cc-5"*
l secom 4acom secom escom m

l 42' Level sac-oc-scom oc. b 4ecom b s2eo. b icom b sicom + @ 43com @ sacom s7com 4.com t l Notes: 26' Level 3,,i[ < i,pgoo, 1, Numbers are the approximate locations of Fixed Measurements and 100cm2 wipes taken on South wall One minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector. Maximum Fixed Measurement results in dpm/100cm2 = <907dpm/100cm2 (MDA = 907dpm/100cm2) i Maximum Wipe results. = 16 dpm/100cm2 and (x s10 dpm/100cm2. @ Debris sample contains Cs-137 and Co-60 '. All Metal Surface O = 1@cm2 Wipe location and ID# G 27 TT25.vsd l

._~. _ - - - - - - - - - _ _. Figura 26: Survsy of ths South Wall (26' - 60') i l 60' Level-Y- R l coopn 31 Cpm uc,o me,o @ e me,. R 4 cnn acan @ l acwa w@ s.e c. 43cpn hI O 61can @ se acwa O l 42' Level hr-( O mow. S 44ce. @ i A mcma acw. @ l sw 33ce. @ l s.m. 46cpn M 31cpn @ t' W l ucan acra @ acwa sacun @ ama. @ l l 26' I rvel C0 CC 4sena @ l Large Rollup door i Notes: P

1. Numbers are the approximate locations of Fixed Measurements and 100cm2 wipes taken on South wall

2. One minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector, i

3. MIximum Fixed Measurement result in dpm/100cm2 = 1531dpm/100cm2 (MDA = 907dpm/100cm2)

4. M ximum Wipe results.

= 36 dpm/100cm2 and at = 38 dpm/100cm2.

5. Debris sample contains Cs-137 and Co-60

6. All Metal Surfaces TT26.vsd O = 100cm2 wipe location and ID#

I 28 l l l

Figure'27: Removable Contamination Results on the South Wall-liigh Bay Side A L 8 9 9 9 9s g m. a a a A L. go e e e e s e-, =

,

z,.,_ .p Wh1Henk+R : ty l. _ _ -.: ~.?p\\.A g g-g ,c, x, D$ e g k' A si mi A L. sa w e y @];}$M,jd ? j/'No 125 ma Jar sample = 67pns. gg5% p mD g-a e S.; mum qgg M M nahm%Ci W@% ^ t "

- m.m 1_ mAus r;

A L. Ground Floor Notes: 1. O Approximate locations and ID# of 100cm2 wipes taken on the South wall

2. Maximum Wipe results.

s10dpm/100cm2 and tx = 12 dpm/100cm2.

5. Debris sample contains Cs-137 and Co-60

6. AllMetalSurfaces TT27.vsd 29 t

i i FigurO 28: Removable Contamination Results on the South Wall '~1 \\ i i 24' f E N> J 9 9 9 J 9 9 O 9 9 8 17, _ g 3 5 3: 7 .y 1 e ?,. y R O 4 <.8 a A a p., g e Small 3 g g, 'f Rollup _ / e g__ . Door s -i_ \\ Ground Floor Notes:

1. O = Approximate locations and ID# of 100cm2 wipes taken on South wall l

2. Maximum Wipe results.

= 13 dpm/100cm2 and a = 13 dpm/100cm2.

3. All Metal Surfaces TT28.vsd 30

t Figure 29: Surv:y of ths Erst Wall (26' - 60') 60' LEVEL h R' ( ge e e ~m e3 so w S ~~ ~ l I S "~ ~ l I (- AD

~

~ m = =

== s 42' LEVEL -- _ :N ,3 O E9 (29 ( { c--@ S-< ~ 34' LEVEL y-g- g .p ( @w/ A sm s W ...m.. , gnm ~ y- ,n-N N1 (0 = (0 i 402 je""l@ 'I i j y i ??#ma ,a ~,. Notes: 26' LEVEL 54

1. Numbers are the approximate locations of Fixed Measurements and 100cm2 wipes taken on East wall

2. One minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector.

3. Maximum Fixed Measurement results in dpm/100cm2 = <907dpm/100cm2 (MDA = 907dpm/100cm2)

4. Maximum Wipe results.

= 13 dpm/100cm2 and at = 12 dpm/100cm2. f

5. Debris sample contains Cs-137 and Co-60

6. AllMetalSurface TT29.M 31 O = 100cm2 wipe iocation and iD,

Figure 30: Removable Contamination Results on the East Wall 9 9 9 s g g g g 17' d O O O =6 G G 5 A A A Ground Floor J Notna: O= Appmximate locations and ID # of 100cm2 Wipes taken on South wall 1.

2. M;acimum Wipe results.

= 16 dpm/100cm2 and at s10 dpm/100cm2.

3. All M:tal Surfaces TT30.vsd 32

l 80' \\ N Figure 31: Surv:y of the North Wall =. (9' - 75') 75' x.' 0e O e 3) G 4 s ,7 .i / \\ / \\ 63' t t. \\ / \\ /\\ / \\ / \\ / \\ / lb o easur en cnd 100cm2 wipes.

2. One minute fixed 52' g

measurements were taken using o Ludlum Model 2221 with [ \\ a 15cm2 shielded GM detector. 50's / \\ N

3. Maximum Fixed

/ \\ O, 8 O Mea:urement result in dpm/ / \\ 100cm2 = 1281dpm/100cm2 (MDA = 907dpm/100cm2).

4. Maximum Wipe y

_} d n s 0 dp m2 3# N/ [ [

6. All Metal Surfaces.

/x ^ g y 26' h x m m e A e mV e WA e 17' d we X dh wi V.XN .. e TT31.vsd I 33

Figure 32: Survey of the West High Bay Wall (Ground to 26' Level) 26' w s-s e = A A m,.7 17' -d O O 9 9 x --- G G G .G G J A c-0 3 8 hs 9' N 5 W W A k dVUUUUUb Ground Floor Notes.

1. O-Approximate iocations and iD *'s of 100cm2 wipes taken on west waii.

2. Maximum Wipe results.

= 19 dpm/100cm2 and at = 12 dpm/100t.m2.

3. Debris sample contains Cs-137 and Co-60.

4. Large area masslinn wipes were taken on each beam. No detectable activity.

~

5. AliMetalSurfaces.

I TT32.vsd 34

Figure 33: Surv;y of the W:st High B:y W ll (26' to 85' Lev:1) 6 0 ,~ a 85' Level m m m um 8 2,_ A .s _ A ,~ s.gw A m, k A 6 o~, l O R ~ ~ 6 5 60' Level a g g_ g A R-A ss _ w. s.gs-R k u_ R A 64 - 4 2,_ 42' Level I N 64 A A Rm, A o-A A A A A um dnw 26, Level a g _ g,_ g ,, _g Notes.

1. O= Approximate locations and ID #'s of Fixed Measurements and 100cm2 wipes taken on West Wall.

2. One minute fixed measurements were taken using a Ludlum Model 2221 with a 15cm2 shielded GM detector.

3. Maximum Fixed Measurement results in dpm/100cm2 = < 907dpm/100cm2 (MDA = 907dpm/100cm2.)

4. Maximum Wipe results. - 23 dpm/100cm2 and (x = 43 dpm/100cm2.

5. Debris sample contains Cs-137 and Co-60.

6. All Metal Surfaces.

TT33.vsd 35

. Figure 34FRemovable Contamination Results on Holst (85' Level East Tower)

w 1

-3/;a<y7 z g g y ;4 t-+ q ["Wirs gm ff H @ g gs n 'a g 47 y 35s @ p % g yJiprpj ( 2,) /> - S (3k \\ N -I1) N l \\ { ~ 5 O Smears: 1 Elec. box 2 Beam 3 Beam 4 Motor 5 Cable 6 Motor Notes.

1. O = Approximate locations and ID #'s of Fixed Measurements and 100cm2 wipes taken on Hoist.

2. Maximum Wipe results. = s 10 dpm/100cm2 and a =s 10 dpm/100cm2.

TT34.vsd 36 ? ... ~ -

Figure 35: Removable Contamination Results on Fan. (85' Level East Tower) [ i Q M A 94 f \\ i s 1 Outside fan plate F n bl des =

1. O = ^pproximate locations and io # s or Fixed ueasurements and 100cm2 wipes taken on Fan.

2. Maximum Wipe results. Q = 12 dpm/100cm2 and a = s 10 dpm/100cm2.

TT35.vsd 37

I f TableL1: STATE OF CA' ACCEPTABLE SURFACE CONTAMINATION LEVELS + f Nuclides* Average *" Maximum

C Removable *d 2

(dpm/100cm ) (dpm/100cm2 (dpm/100cm ) 2 U-nat,2'5U,2"U, & associated decay 5,000 15,000 1,000 products [ Transuranics,2'*Ra,22 Ra, 8"Th, 22eTh. 100 300 20 t 2Pa, ar'Ac, asg, ing Th-nat, 282Th, "Sr, 223Ra, 22*Ra, as2U, '81, 1,000 3,000 200 '8'i, l Beta / gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except "Sr and other noted above Where surface contamination by both alpha-and beta / gamma-emitting nuclides exists, the limits a established for alpha-and beta / gamma-emitting nuclides shovid apply independently, b As used in this table dpm (disintegrations per minute) means the rate of emission oy radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, eWency, an geometric factors associated with the instrumentation, Measurements of average contaminant should not be averaged over more than 1 square meter. For c objects ofless surface area, the average should be derived for each such object. d The maximum contamination level applies to an area of not more than 100 cm 8 The amount of removable radioactive material per 100 cm of surface area should be determined by 2 e wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency. When removable contamination on objects of less surface area is determined, then pertinent levels should be reduced proportionally and the entire surface should be wiped. f The average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mrad /hr at 1 cm and 1.0 mrad /hr at 1 cm, respectively, measured through not more than 7 milligrams per square centimeter of total absorber, i Guidelines For Decontamination of Facilities and Equipment Prior to Release for Unrestricted Use or Termination of Ucenses For byproduct, Source, or Special Nuclear Matertal, also known as "Decon.1" incorporated into GA's State of CA Radioac:ive Materials License. 38

~ ~ - N r f.,- ~ TABLE 2F UST OF INSTRUMENTS - +1 m t i RATEMETER ' DETECTOR RANGE (CPM) CAIJBRATIDN EFFICIENCY BACRGROUND DESCIUPTION I DUE DATE (cpm) ~ Ludlum Ludium Model 43-37 Four Linear Ranges 1-6-98 5 = 20.30% Varios accordmg Active Probe Arom = 434cm. The detector and retameter are comtMned 8 l Model 2221 gas proportional (434 0 - 500,000 & One en St-90 to surface bomg and mounted on a roll around cart. The instrument features a statonow S/N 73701 cm') Beta detector Log 50 - 500,000 scanned system, quid connects, a portable gas bottle and a means to adjust the S/N 083265 See Table 4 height of the detector from the floor for opbmum performance Ludlum Ludlum Model 43-68 Four linear ranges 9-1-97 p = 34.98% Varies accordmg 100 crn" gas flow proportonal counter. Model 2221 100 cm' oroportional 0 - 522,n00 & one 4n Sr-90 to surface being S/N 88423 counter SN 119444 log 50-C00,000 scanned See Table 4 i t Ludlum Ludlum Model 43-65 Four Ratiges 8-28-97 a=21.22% 0 Active Probe Area = 50 cm8 Model 12 Alpha ScintiRator 0 - 500,00G en Th-230 S/N 91051 ZnS(Ag) S/N 94053 or checking W area messlin wipes for a m. i Ludlum Ludlum Model 44-9 Four Ranges 8-28-97 a=21.22% 0-120 Active Probe Area = 15 cmr 'i Model 14A beta / gamma probe 0 - 500,000 du Th-230 [ S/N 83842 S/N 290314 Used for i _ _....surveymg Technical Ebertine HP-260 Three Ranges 1-7-98 p=24.95% 0-120 Adive Probe Area = 15 cm8 i Assocates beta / gamma GM 0-500,000 en Sr-90 TBM-15 pandtake detector n Used for initial scannmg of cracks, comers and wak areas. s/n 79064 2 Ludium Model Ludium Model 44-40 Four Linear Ranges 1-9-98 p=21.39% 0-120 Active Probe Area = 15 cm 2221 s/n beta /gamme shielded 0 - 500,000 & One ' 4n Sr-90 86327 GM pancake probe Log 50 - 500,000 Used for surveying and for thred moseurements (1 or 2 mmutes counts) l s/n 067171 in decult to reach places. Ludlum Model RCA 6199 coupled to Five Ranges 9-24-97 N/A 10-18 WR/hr 1 inch x 1 inch Not (TI) scetillator is mounted intomally in McroR Meter a Nel(TI) Scintillator 0 - 5 mR/hr I S/N 87120 Used for initial survey on ground floor and for messunng extemal dose rates on the surface and at one meter. i Canberra Gas Flow N/A Count smears '-26-30 % a < 0.5 Low Level al 9 gas proportonal counting system Low Level Proportional for removable p<2.0 i al p Counter Detector alp surface Model 2404 contammebon -t 'hr 5 39 t g = m. m. . = v- ,-s. .m---m_,-, +, - -. - -

TACLE 3:' Background Measurements 1 100 cm2 beta detector (2 Minute Counts) Background Material Average of 5 measurements MDA (dpm/100 cm ) ) 2 (2 minutes each) total counts i 2 SD Concrete 926i210 206 i Metal 411i34 139 i ~ Asphalt 700 1 80 180 15 cm' shielded GM detector (2 Minute Counts) Background Material Average of 4 measurements MDA (dpm'100 cm ) 2 (2 minutes each) total counts i 2 SD Concrete 164i84 970 Metal 70 i 18 650 Asphalt 134i28"I 883 15 cm" shielded GM detector (1 Minute Count) Background Mate'ial Average of 4 measurements MDA (dpm/100 cm ) r 2 (2 minutes each) total counts i 2 SD Concrete 86 i 14 1432 l Metal 3217 907 Asphalt 6716"3 1275 Floor Monitor Background Scan Results l Beta / gamma Scan Range Beta / gamma Scan Range l Surface (counts per 2 minutes) (counts per minute) Metal 1266-1383 633-692 Concrete 2847-3039 1424-1520 Asphalt 1954-2123 977-1062 "I Av: rage of 5 measurements. l l 40 l l

Tcble di Results tf Characterization Sr rveys for Building 35 (Test Tower Facility)( Fis-Location ~

of Fixed Maximman :
of Fixed

. Maximum

of:

Maximum . Sample Rosalts > . Espesure Rate. Measurements - Result Measurements -

Resmit Smears

. Rasmit. _ sea / paint / debris)-- ( (d m/100cm2) f alp and ory Spec Range ( R/hr) y (with 100 cal. (dpm/100 em2) .. (with 15 cm2 - . (dpe/100 em2) - P I Drawing of Building 35 (Test Tower Facility) 2 Outside Scanned the Outside South Metal Wall (50% of the area was scanned up to 2 m) with a Ludlum 2221 Ratemeter with a 432cm detector (beta). 2 South Wall Measurements ranged from ~570 to ~843 cpm Scanned the Outside Concrete / Asphalt Pad (50% of the area was scanned out 2 m from the building) with a Ludlum 2221 Ratemeter with a 432cm2 det Measurements ranged fmm ~1046 to ~1287 cpm 3 Building Background Readings were Performed at Building 35-1 for Comparison at Building 35 (Test Tower Facility). 35-1 Measurements on metal ranged from ~633 to ~692 cpm. ~ Measurements on asphalt ranged from -973-1062 cpm. Measurements on concrete ranged from ~1423 to 1520 cpm. 4 Outside 14 <l39 South Wall 5 Outside 7 <650 South Wall 1 6 Outside 7 1402 Concrete Pad (base ofwall) 7 Outside 7 <970 Concrete Pad (base of south wall) -. r. < l 8 Outside 6 <10a md <10 p South Wall 9 Outside of ~ 8-13pR/hr Building (south side) (14 measurements) 10 Mechanical Scanned the Concrete Surface (100 % in entryways and 10% in other areas as shown in Figure 10) with a Ludlum 2221 Ratemeter with a 432cm detector (beta). 2 Shop Measurements ranged from ~980 to-1354 cpm. i 41

Tcble 4: Res;lts cf Charact;rization S rveys for B;ilding 35 (Test Tower Fccility) r w. 14 cation ' . # of Fixed Manimum

of Fixed.

Maximum - # of. Maximum Sample Results Exposure Rate - o Measurements Result Measurements. Result Smears Result ' (soil / paint / debris) Range (gR!br) ~(with 100 cm2 (dpm/100 cm2) (with 15 cm2 (dpat/100 cm2) (dpattee em2) a/p nad or y spec - detector) detector) 11 htcchanical 12 <2% Shop Soil Sample (y spec) Cs-137 = 0.31 pCi/g Co-60 = 0.13 pCi/g 12 hiechanical 8-IlpR/hr@lm Shop + 8-15pR/hr@ contact 13 Ground There were eight (8) Large Area Masslinn Wipes taken on the Ground Floor (Main Floor). Each masslin wipe covered an area -27 in length. No alpha or beta activity Level Cracks and depressions along the floor were also surveyed as well as concrete seams. 14, Ground -1:- 28,562 ~1 4,395 1 Debris sample (y spec) from - 8-30 pR/hr - 15 & ' Level (ieside trough) (GM count of inside trough: (30 pR/br reading 16 smear from Cs-137/Co-60 detected is trough) inside trough) 17 9' Level 6 937 Paint Sample (y spec): Only Naturally Occurring Radionuclides Detected 18 - 17 Level 6 ~ 3500(incrack) 6 paint samples (a/p results): max = 386 dpm/100 cm ' 2 I debris sample (y spec): Cs-137 & Co-60 d-~' 19 26' Level There were 16 Large Masslinn Wipes taken on the 26' Level Each masslin wipe covered an area ~10*-15' each in length. No alpha or beta activity was detected. Cracks and depressions along the metal floor surface were also surveyed (including seams). 20 26' Level 9 1593 12 paint samples (a/l1 results): max = 300 dpm/100 cm2

(y spec results);

~ 10- only naturally occuring radionuclides detected -I. 3784 ' 2-Cs-137 max -486 dpm/100 cm 2 4 debris samples (y specy - Scan with.. ~ In between Cs-137 and Co40 detected on Dl; TBM-28 geiger . metal seams D2 and D4 samples,Cs-137 on D3 counter - 4 l 9 ,,,,_y..

Tcble 4: Res;lts c f Ch:racterization Szrveys for &ilding 35 (Test Tower Facility) ; r -- Location - # of Fixed Maximum

of Fixed.

Maximum

of ^

Maximum Sample Reseks Exposure Rate Measurements - Result - Messerements Result Smeers Result (soillpoint/ debris) _ Range (gR/hr) - (with 100 cm2 (dpai/100 cm2) (with 15 cm2 - (dpm/100 cm2). (dpa/les em2) s/p and er y Spec > detector). i detector)- 21 34' Level 2 937 6 paint samples (a/p results): max = 53 dpm//100 cm2 22 42' Level 2 1281 23 50' Level 6 1375 1 debris sample (y spec): Cs-137 24 South Wall 6 <907 21 < 10a and 16p (edge of Bay 26*-53') 25 South Wall 36 <907 54 < 10a and 16p 2 debris samples (y spec): (u=*r and 6r) ~ Cs-137 and Co-60 detected rollup door 26'- ,4 26 South Wall 28 1531 75 38 a and 36 p 2 debris samples (y spec): (26'-60') Cs-137 and Co-60 detected 27 South Wall 51 13 a and <10p I debris sampic(y spec): OEsh bay **) Cs-137-1.46 pCi/g Co-60-1.52 pCi/g 28 South Wall 62 13 a and 13 p 29 East Wall 18 <907 46 12 a and 13 p 1 debris sample (y spec): 1 (26*-60') Cs-137 and Co-60 detected 30 East Wall 35 <10 a and 165 (9'-75') 31 North Wall 21 1281 141 <10s and 165 (9'-75') 32 West Wall 55 12 a and 19 1 debris sample (y spec): (ground - 26') Cs-137 ~ 2.03 pCi/g Co 0.54 pCilg 43 4 ' - - - ' ' ' ' ^ ' ' ' ' ~ ' -

1.ble 4: Results cf Characterization Surveys for Building 35 (Test Tower Facility)) Ms== - .. Locaties '

of Fixed Maximum.
etFixed ;

iMaximum '- ) # of :. -? Maximum. Sample Resuks.$ Exposure Race : Measurennents . ReseN Messenments .(dym/100 cm2):. (dpe/les em2) e$ and er y spee ' . Resuk j smears Resuk. - (M. ._1 debris) : Rasse ( R/hr) - (with 100 cm2 (dym/leeem2): ' (with 15 cm2 - ~ detector) detector). 33 West Wall 29 <907 60 43 a and 23 $ 2 debris sampled (y spec): (hi bay 26'-85) C3137 and Co40 A t-M 34 Iloist at @ 6 <10er and 13 $ 8F Level-West Tower 35 Fan @8T 6 <10s and 10 S Level a\\ b +v 1 - _ _ _ _ _ _ _ _}}

ML20154D292

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