E910-02-002, Experimental Corp, Phase 2 & 3 Characterization Data

Experimental Corp, Phase 2 & 3 Characterization Data

ML020360284
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	01/11/2002
From:	Kuehn G GPU Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
E910-02-002
Download: ML020360284 (17)

Text

GPU Nuclear, Inc.

NLPU NUCLEAR Route 441 South Post Office Box 480 Middletown, PA 17057-0480 Tel 717-944-7621 717-948-8720 January 11, 2002 E910-02-002 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Gentlemen,

Subject:

Saxton Nuclear Experimental Corporation (SNEC)

Operating License No., DPR-4 Docket No. 50-146 Phase 2 & 3 Characterization Data As committed in GPU Nuclear letter E91 0-01-001, dated January 30, 2001, this document provides the remaining characterization information requested by the NRC in their letter dated January 17, 2001. To date two submittals have been sent to the NRC. These were:

- GPU Letter E910-01-013 dated July 2, 2001: Phase 1 characterization of the DSF, CV Pipe Tunnel subsurface soil and pavement and subpavement soil.

- GPU Letter E910-01-016 dated September 4, 2001: Phase 2 characterization of the Saxton Steam Generating Station (SSGS), SSGS Discharge Tunnel and Surrounding Environs. River sediment information was not available at the time of this submittal.

This submittal provides the remaining characterization information for river sediment from Phase 2 and Phase 3 characterization results for the SNEC Facility Yard Drains and Intake Tunnel. Because of the communication between the SSGS basement and Discharge Tunnel, the Intake Tunnel was included into Phase 3. Format changes and/or revisions to the applicable sections of the SNEC License Termination Plan (LTP), Chapters 2.0 & 5.0, will be made to incorporate this additional characterization data.

If you have any questions, please contact Mr. James Byrne at (717) 948-8461.

Sincerely, G. A. Kuehn Program Director, SNEC cc: NRC Project Manager NRC Project Scientist, Region 1 00

Phase 2 - River Sediment Characterization 1.0 River Description The Raystown Branch of the Juniata River meanders from its headwaters near Deeters Gap in Somerset County through rural Bedford County. From Deeters Gap, the river runs an easterly course through the Town of Bedford, Pennsylvania. After Bedford, the river takes a northeasterly course to Saxton, Pennsylvania where the river begins to form Raystown Lake. The river upstream of Raystown Lake is characterized by slow pools and interrupted by fast shallow riffles.

The Saxton Steam Generating Station (SSGS) Dam, located adjacent to the SSGS, was constructed to impound water for the SSGS. Although this dam was breached after shutdown of the SSGS in 1974, it was in place during the operational period of the Saxton Nuclear Experimental Corporation (SNEC) Facility. The SSGS Dam was a 780 feet long concrete gravity dam on the Raystown Branch, about 700 feet downstream from the mouth of Shoup's Run. The dam was constructed in three sections with crest elevations of 790.00 on the western end, 792.00 on the center section, and 794.00 on the eastem end. The western and center sections were provided with permanent steel flashboards that raised the crest to 793.83. Backwater from the SSGS Dam extended 1.5 miles upstream according to one historical report. However, based on a crest elevation of approximately of 794.00, it is possible that the backwater created by this dam extended to a point approximately 3.5 miles upstream. The pool created by the SSGS Dam received potentially contaminated runoff from the spray pond area and is therefore a depositional feature that was considered for sampling activities.

2.0 Sampling Activities 2.1 Sample Collection Methods Sample collection methods were selected for each sample collection site based on site reconnaissance activities conducted prior to sampling. At each site one of the following methods was used to collect samples:

1. Core sampling

2. Ponar sampling

3. Suction sampling

4. Scoop sampling 2.1.1 Core Sampling Core sampling was used at sites where sediment depth was expected to be significant. To conduct core sampling, the survey team utilized a slide hammer mounted to a 14-foot long modified sediment sampling vessel. The slide hammer was used to drive 3-inch diameter stainless steel sampling tubes with plastic liners (if appropriate) into river substratum and bottom sediments. Sampling tubes were driven to refusal in all cases (penetration < 6 inches per 50 hammer blows). The core sample was then recovered using a winch system.

2.1.2 Ponar Sampling Ponar sampling was conducted at sites where core sampling was not expected to result in significant sediment recovery but sediment depth was sufficient to allow effective use of a Petit Ponar sampler. Ponar sampling was accomplished by slowly lowering a 6"Petit Ponar sampler on a rope to the substrate and closing the sampler with a sharp pull on the rope. The sampler was then raised and the sampler contents were emptied into one or more 10-gallon plastic tub(s). Multiple ponar grabs were obtained for each sample in an effort to collect a sufficient sample volume for analytical testing. The contents of the 10-gallon plastic tub(s) were allowed to settle and excess water was removed by decanting.

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2.1.3 Suction Sampling Suction sampling was conducted at submerged sites where neither core sampling nor ponar sampling was expected to be effective due to minimal sediment deposition. Suction sampling was conducted using a trash pump with a small nozzle that prevented the collection of large particles. To conduct suction sampling, a 30 inch diameter corrugated polyethylene pipe section that measured 22 inches long was placed on the streambed to isolate the sample location. The substrate was agitated by the sampling team to suspend fine grained sediments, and sediment-laden river water was pumped to two 50-gallon plastic tubs. The contents of the 50-gallon plastic tub(s) were allowed to settle, and excess water was removed by decanting. The contents remaining in the two 50-gallon plastic tubs were then combined into one 10-gallon plastic tub.

2.1.4 Scoop Sampling River levels during the sampling period were sufficiently low to allow collection of sediments from areas of the streambed that was not submerged. Sediment sampling in these exposed areas that are normally submerged areas was accomplished by scooping sediment into plastic bags. In some areas, cobbles and boulders were moved to expose sediment deposits and facilitate collection of finer-grained sediments.

2.2 Sample Collection Summary The selection of the sediment sampling sites (Table 1) was based on areas of interest and field reconnaissance activities performed to identify likely depositional zones. Field reconnaissance typically consisted of visual observations of substrate and river flow conditions and physical probing of the substrate using steel rods or other implements. In addition, reconnaissance included use of a recording fathometer where appropriate to obtain information regarding the water depths.

The sampling locations included background river sites, near field river sites, river sites in the immediate vicinity of the SNEC Weir discharge, river sites in the immediate vicinity of the SNEC Discharge Tunnel, and standing water sites near the former Spray Pond. Two samples were collected at each site. Pertinent sample information was recorded on Sediment Sampling Data Forms, and field notes were recorded in an Environmental Field Book. Table A presents an overview of the sampling program and the following sections summarize sample collection activities.

Table A - Overview of Sampling Program Number of Sample Area of Interest Collection Sites Number of Samples Background 3 6 Near Field River Sites 10 20 SNEC Discharge Tunnel 5 10 SNEC Weir Line 6 12 Spray Pond 2 4 Total 26 52 2.2.1 Background Sites Background sites were located in the river upstream of possible contamination from the SNEC Facility. These sites were identified as BKG-1, BKG-2, and BKG-3.

BKG-1 is located near the right bank(') of the river in the large pooled area upstream of the bridge at Riddlesburg, PA. Site BKG-1 was selected after conducting site reconnaissance of the Riddlesburg Pool.

Reconnaissance started at the Riddlesburg Bridge and proceeded upstream until a suitable sediment deposition area was discovered. By randomly probing with a steel rod from a boat, it was determined that the (1)All references to right bank and left bank throughout this report are based on a descending river perspective.

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Riddlesburg Pool substrate consisted primarily of cobbles and boulders. Soft sediment deposits were found in 4 feet of water at Site BKG-1. Core samples SXSD1537 and SXSD1538 were obtained at this location.

BKG-2 is located in Warriors Path State Park near the left bank just downstream from the end of Warriors Park Road. Access to the river was obtained from the gravel access road that runs along the river at the end of Warriors Park Road. Site BKG-2 was selected after conducting reconnaissance by boat in one pooled area (known locally as "Big Salmon Hole") and by wading in riffle and run areas which predominate in this area.

Reconnaissance proceeded from "Big Salmon Hole" downstream to Site BKG-2. Substrate in the pool and riffle/run areas consisted primarily of cobbles and boulders. Soft sediment deposits were found in 2.5 feet of water at Site BKG-2. Ponar samples SXSD1539 and SXSD1540 were obtained at this location.

BKG-3 is located in Warriors Path State Park near the right bank just downstream of the Canoe/Raft Access Ramp. Site BKG-3 was selected after wading riffle and run areas near the access ramp. Substrate in the river near the access ramp area consisted primarily of cobbles and boulders. Soft sediment deposits were found at 0.5 feet of water at Site BKG-3. Ponar samples SXSD1543 and SXSD1544 were obtained at this location.

2.2.2 Near Field River Sites Ten near field river sites referred to as Sites I through 4 and Sites 6 through 11 are located in depositional zones that are in close proximity to the SNEC Facility. Each of these sites is located in an area that could have been impacted by SNEC Facility discharges. Sites 1 through 3 are in the former pool area upstream of the SSGS Dam, and may have been impacted by spray pond discharges. Site 4 is located just downstream of the SSGS Dam and may have also been impacted by the spray pond discharges. In addition, Site 4 is downstream of the former Shoup's Run shunt line discharge which carried acid mine drainage (AMD) to the Raystown Branch during the SNEC Facility's operational period. Site 4 samples could provide an indication of whether radiological contaminants adsorbed to AMD precipitates and deposited in close proximity to the SNEC Facility. Site 5 was intended to be in close proximity to the SNEC facility in the vicinity of the Discharge Tunnel and Weir Line. However, Site 5 was abandoned because this same area was well represented by other sampling sites in close proximity to the Discharge Tunnel and Weir Line. Site 11 was added downstream to compensate for the removal of Site 5 from the sampling program. Sites 6 through 11 are downstream of all SNEC Facility point source discharges.

2.2.3 Weir Line Sites Six weir sites were located in the outfall vicinity of the former Weir Line. These sites are identified as Weir 1 through Weir 6. Weir 6 location was added later as a confirmatory point to Weir 1, which indicated Cs-1 37 activity above background.

2.2.4 Discharge Tunnel Sites Five Discharge Tunnel Sites were located in the immediate vicinity of the Discharge tunnel. These sites are identified as Discharge Tunnel I through Discharge Tunnel 5.

2.2.5 Spray Pond Sites Two Spray Pond Sites were located in the immediate vicinity of the former Spray Pond. These sites are identified as Spray Pond Lagoon, and Spray Pond Bog Spray Pond Lagoon The Spray Pond Lagoon is a pool of standing water (approximately 10 feet deep) that has formed at the mouth of Shoup's Run. The Lagoon, which is fed by Shoup's Run, remains separate from the river except during high flow. The Spray Pond Lagoon site was included in the sampling program because it is adjacent to the former Spray Pond, and it was probably part of the former pool created by the SSGS Dam. Core samples SXSD1498 and SXSD1499 were obtained at this location.

Spray Pond Bog The Spray Pond Bog is an area of shallow standing water (approximately 2 feet deep) that has formed along the north side of the Shoup's Run dike. The Shoup's Run Dike runs along the south side of Shoup's to its mouth. The Spray Pond Bog site was included in the sampling program because it is W:/LTP Latest Revision/Phase2&3NRCsubmittal.doc 3

adjacent to the former Spray Pond and historic aerial photographs suggest that runoff from the Spray Pond accumulated in this area. Ponar samples SXSD1500 and SXSD1501 were obtained at this location.

3.0 Sample Results Tables 2 & 3 provide the radiological results. With the exception of Weir 1 & 6 locations, all other sampling locations had results that were at or below environmental background detection levels and are thus classified as non-impacted. U-234, U-235 and U-238 activity was also found in samples. Results of these uranium nuclides are listed in Table 3. These results are indicative of natural background uranium.

Weir I & 6 samples averaged 1.7 pCi/g for Cs-137. These samples were obtained from a 25 m2 (approximate) area surrounding the location where the mouth of the weir pipe used to be (i.e. 4 feet from weir head wall into the river). The contamination in this area is less than 25% of the site DCGL and will be classified as an impacted Class 2 area. This information will be updated in Chapter 5 (Figure 5-1 and Table 5-2) of the SNEC LTP.

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Table I Sediment Sampling Locations Sample Sample Sample Site Identification Identification Latitude Longitude Date Time Sample Type Weir 1 SXSD1472 400 13' 42.539" 78014' 33.429" 10/10/01 855 Scoop Weir 1 SXSD1473 400 13' 42.539" 780 14' 33.429" 10/10/01 900 Scoop Weir 2 SXSD1474 400 13' 43.417" 780 14' 30.996" 10/10/01 1205 Scoop Weir 2 SXSD1475 400 13' 43.417" 780 14' 30.996" 10/10/01 1215 Scoop Weir3 SXSD1476 400 13' 43.491" 78° 14' 31.384" 10/10/01 1226 Scoop Weir3 SXSD1477 400 13' 43.491" 780 14' 31.384" 10/10/01 1232 Scoop Weir 4 SXSD1478 400 13' 43.676" 78°14'32.104" 10/10/01 1240 Scoop Weir 4 SXSD1479 400 13' 43.676" 780 14' 32.104" 10/10/01 1245 Scoop Weir 5 SXSD1480 40" 13' 42.832" 780 14' 32.382" 10/10/01 1415 Suction Weir 5 SXSD1481 400 13' 42.832" 780 14' 32.382" 10/10/01 1420 Suction Weir 6 SXSD1545 400 13' 42.597" 780 14' 33.435" 10/18/01 817 Suction Weir 6 SXSD1546 400 13' 42.597" 780 14' 33.435" 10/18/01 823 Suction Discharge Tunnel 1 SXSD1482 400 13' 43.548" 780 14' 34.806" 10/10/01 1502 Scoop Discharge Tunnel 1 SXSD1483 400 13' 43.548" 780 14' 34.806" 10/10/01 1508 Scoop Discharge Tunnel 2 SXSD1484 400 13' 43.561" 780 14' 35.097" 10/10/01 1525 Scoop Discharge Tunnel 2 SXSD1485 400 13' 43.561" 780 14' 35.097" 10/10/01 1535 Scoop Discharge Tunnel 3 SXSD1486 40" 13' 42.284" 78014' 34.657" 10/10/01 1515 Ponar Discharge Tunnel 3 SXSD1487 40" 13' 42.284" 78014' 34.657" 10110/01 1530 Ponar Discharge Tunnel 4 SXSD1488 400 13' 42.440" 780 14' 36.302" 10/10/01 1555 Ponar Discharge Tunnel 4 SXSD1489 400 13' 42.440" 78014' 36.302" 10/10/01 1605 Ponar Discharge Tunnel5 SXSD1490 400 13' 42.116" 78014' 36.419" 10/10/01 1612 Scoop Discharge Tunnel5 SXSD1491 40" 13' 42.1 16" 78014' 36.419" 10/10/01 1615 Scoop Spray Pond Lagoon SXSD1498 400 13' 27.614" 78o14' 40.116" 10/11/01 1130 Core Spray Pond Lagoon SXSD1499 400 13' 27.614" 78014' 40.116" 10/11/01 1155 Core Spray Pond Bog SXSD1500 400 13' 28.015" 78014' 39.220" 10/11/01 1240 Ponar Spray Pond Bog SXSD1501 400 13'28.015" 78014' 39.220" 10/11/01 1242 Ponar Site 1 SXSD1502 400 13'20.197" 78°14'35.441" 10/11/01 1310 Scoop Site 1 SXSD1503 400 13'20.197" 78014' 35.441" 10/11/01 1313 Scoop Site 2 SXSD1496 400 13' 30.559" 78014' 43.783" 10/11/01 1018 Scoop Site 2 SXSD1497 400 13'30.559" 78014' 43.783" 10/11/01 1022 Scoop Site 3 SXSD1494 400 13' 32.130" 78014' 45.129" 10/11/01 1007 Ponar Site 3 SXSX1495 400 13' 32.130" 78014' 45.129" 10/11/01 1010 Ponar Site 4 SXSD1492 40" 13' 36.644" 78014' 46.519" 10/11/01 947 Scoop Site 4 SXSD1493 400 13' 36.644" 78°14' 46.519" 10/11/01 954 Scoop Site 5 Deleted due to redundancv with discharoe tunnel s mplin __.

Site 6 SXSD1506 400 13'56.499" 78'13'53.996" 10/15/01 1415 Core Site 6 SXSD1507 400 13' 56.499" 78013' 53.996" 10115/01 1430 Core Site 7 SXSD1508 400 13' 59.081" 780 13' 48.768" 10/15/01 1510 Core Site 7 SXSD1509 400 13' 59.081" 78013' 48.768" 10/15/01 1532 Core Site 8 SXSD1535 400 14' 01.520" 78" 13'39.818" 10/16/01 946 Core Site 8 SXSD1536 400 14'01.520" 78°13'39.818" 10116/01 1014 Core Site 9 SXSD1504 400 13' 57.580" 78°13' 24.309" 10/16/01 1200 Core Site 9 SXSD1505 400 13' 57.580" 78°13' 24.309" 10/16/01 1216 Core Site 10 SXSD1470 40" 14' 16.367" 78013' 15.900" 10/9/01 1530 Core Site 10 SXSD1471 40" 14' 16.367" 78013' 15.900" 10/9/01 1600 Core Site 11 SXSD1547 40" 14' 54.757" 780 13' 49.096" 10/18/01 1116 Core Site 11 SXSD1548 400 14'54.757" 78013' 49.096" 10/18/01 1200 Core BKG - 1 SXSD1537 40" 09' 25.063" 78" 15' 22.185" 10/17/01 940 Core BKG - 1 SXSD1538 400 09' 25.063" 78015' 22.185" 10/17/01 955 Core BKG -2 SXSD1539 40" 12' 12.494" 78015' 46.467" 10/17/01 1300 Ponar BKG -2 SXSD1540 400 12' 12.494" 78015' 46.467" 10/17/01 1315 Ponar BKG -3 SXSD1543 40" 11' 47.708" 780 15'04.959" 10117/01 1355 Ponar BKG -3 SXSD1544 40" 11' 47.708" 78015'04.959" 10/17/01 1405 Ponar W:/LTP Latest Revision/Phase2&3NRCsubmittal.doc 5

Table 2 Juniata River Sediment Gamma Spec Results SAMPLE Cs-137 Co-60 Co-60 TIME DESCRIPTION/LOCATION C SAMPLE ID HpGe ID # DAE DATE COCi/¢" ('pCi/.q)

. 3-9330 1 0/10/01 855 . 2.55 < 0.08 1473 2-9329 10/10/01 900 WEIR SITE #1 1.07 < 0.06 1474 3-9327 10/10/01 1205 WEIR SITE #2 < 0.07 < 0.07 1475 2-9326 10/10/01 1215 WEIR SITE #2 0.05 < 0.055 1476 1-9325 10/10/01 1226 WEIR SITE #3 < 0.039 < 0.05 1477 1-9338 10/10/01 1232 WEIR SITE #3 < 0.06 < 0.05 1478 2-9339 10/10/01 1337 WEIR SITE #4 < 0.06 < 0.05 1479 1-9328 10/10/01 1245 WEIR SITE #4 < 0.05 < 0.04 1480 1-9344 10/10/01 1415 WEIR SITE #5 0.15 < 0.04 1481 1-9345 10/10/01 1420 WEIR SITE #5 0.08 < 0.04 1545 1-9412 10/18/01 817 WEIR SITE #6 1.8 < 0.05 1546 2-9413 10/18/01 823 WEIR SITE #6 1.2 < 0.07 1482 2-9346 10/10/01 1502 DISCHARGE TUNNEL #1 0.07 < 0.06 1483 2-9354 10/10/01 1508 DISCHARGE TUNNEL #1 < 0.07 < 0.07 1484 3-9352 10/10/01 1525 DISCHARGE TUNNEL #2 < 0.09 < 0.07 1485 2-9366 10/10/01 1535 DISCHARGE TUNNEL #2 < 0.04 < 0.07 1486 3-9356 10/10/01 1515 DISCHARGE TUNNEL #3 < 0.05 < 0.06 1487 2-9348 10/10/01 1530 DISCHARGE TUNNEL #3 < 0.045 < 0.06 1488 1-9371 10/10/01 1555 DISCHARGE TUNNEL #4 < 0.05 < 0.04 1489 2-9372 10/10/01 1605 DISCHARGE TUNNEL #4 < 0.06 < 0.06 1490 3-9349 10/10/01 1612 DISCHARGE TUNNEL #5 < 0.06 < 0.06 1491 2-9351 10/10/01 1615 DISCHARGE TUNNEL #5 < 0.06 < 0.06 1498 1-9369 10/11/01 1130 SPRAY POND LAGOON < 0.06 < 0.05 1499 2-9364 10/11/01 1155 SPRAY POND LAGOON < 0.06 < 0.07 1500 1-9367 10/11/01 1240 SPRAY POND BOG < 0.06 < 0.06 1501 1-9363 10/11/01 1242 SPRAY POND BOG < 0.14 < 0.12 1502 1-9365 10/11/01 1310 RIVER SITE #1 < 0.04 < 0.05 1503 1-9361 10/11/01 1313 RIVER SITE #1 < 0.05 < 0.05 1496 3-9358 10/11/01 1018 RIVER SITE #2 < 0.05 < 0.08 1497 3-9362 10/11/01 1022 RIVER SITE #2 < 0.1 < 0.1 1494 3-9360 10/11/01 1007 RIVER SITE #3 < 0.1 < 0.09 1495 2-9357 10/11/01 1010 RIVER SITE #3 < 0.1 < 0.09 1492 2-9370 10/11/01 947 RIVER SITE #4 < 0.08 < 0.07 1493 1-9347 10/11/01 954 RIVER SITE #4 < 0.047 < 0.057 1506 1-9397 10/15/01 1415 RIVER SITE #6 0.07 < 0.04 1507 2-9399 10/15/01 1430 RIVER SITE #6 < 0.053 < 0.055 1508 1-9390 10/15/01 1510 RIVER SITE #7 < 0.05 < 0.04 1508-B 2-9403 10/15/01 1510 RIVER SITE #7 < 0.06 < 0.05 1509 2-9391 10/15/01 1532 RIVER SITE #7 < 0.06 < 0.06 1509-B 1-9402 10/15/01 1532 RIVER SITE #7 < 0.04 < 0.03 1535 2-9386 10/16/01 946 RIVER SITE #8 0.09 < 0.06 1536 1-9387 10/16/01 1014 RIVER SITE #8 0.11 < 0.05 1-9392 10/15/01 1200 0.16 Q < 0.04 1505 2-9393 10/15/01 1216 RIVER SITE #9 < 0.06 < 0.06 1470 1-9333 10/9/01 1530 RIVER SITE #10 0.13 < 0.037 1471 2-9334 10/9/01 1600 RIVER SITE #10 < 0.044 < 0.04 1547 1-9420 10/18/01 1116 RIVER SITE #11 < 0.03 < 0.04 1548 2-9416 10/18/01 1200 RIVER SITE #11 < 0.049 < 0.063 2-9419 10/17/01 940 i 0.08 < 0.07 1538 2-9421 10/17/01 955 BKG #1 RIDDLESBURG < 0.07 < 0.07 1539 2-9423 10/17/01 1300 BKG #2 WARRIORS PATH 0.07 < 0.06 1540 1-9418 10/17/01 1315 BKG #2 WARRIORS PATH 0.09 < 0.05 1543 1-9422 10/17/01 1355 BKG #3 WARRIORS PATH 0.01 < 0.04 1544 1-9414 10/17/01 1405 BKG #3 WARRIORS PATH < 0.04 < 0.05 Areas with a < symbol are less than N

• TRU analyses performed on these samples (Ref. BWXT Report #0110089).

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Table 3 Juniata River Sediment TRU/HTD Results Results (pC ila Isotope Weir #1 River Site #9 Bkq #1 (Riddlesburci)

H-3 < 1.02E+01 < 1.01 E+01 < 9.62E+00 C-14 < 4.58E+00 < 4.82E+00 < 4.94E+00 Fe-55 < 1.19 E+00 < 3.21 E-01 < 1.61 E-01 Ni-59 < 5.20E+00 < 1.34E+01 < 5.74E+00 Ni-63 < 7.46E+00 < 6.94E+00 < 7.98E+00 Sr-90 < 1.40E-02 < 1 .OOE-02 < 1 .OOE-02 Tc-99 < 5.56E-01 < 2.05E+00 < 1.25E+00 1-129 < 1 .35E+00 < 1.46E+00 < 1 .27E+00 Np-237 < 3.41 E-03 < 5.45E-03 < 1.03E-02 Pu-242 < 3.41 E-03 < 4.35E-03 < 3.56E-03 Pu-239/240 < 3.41 E-03 < 3.1 2E-03 < 3.56 E-03 Pu-238 < 3.41 E-03 < 3.48E-03 < 3.56E-03 Pu-241 < 9.60E-01 < 1 .06E+00 < 1.15 E+00 Am-243 < 5.1 3E-03 < 2.83E-03 < 3.50E-03 Am-241 < 4.89E-03 < 2.83E-03 < 3.50E-03 Cm-244 < 3.70E-03 < 3.16E-03 < 3.50E-03 U -2 3.4..... -.... .. .......... j~

U-235 42 ..... 02. < .... 3 -0N U-238 I 0 C o-60 < 2.74E602 1 375-02 Nb-94 < 1 .08E-02 < 2.36E- 02 < 1 .13E-02 Sb-125 < 3.83E-02 < 5.90E-02 < 3.11 E-02 Cs- 134 < 1.57E-02 < 3.86E-02 < 2.04E-02 C s- 13 7 P______

4~4~

Ce-144 < 8.78E-02 < 1 .32E-01 < 8.73E-02 Eu-1 52 < 6.24 E-02 < 1 .39E-01 < 6.86 E-02 Eu-1 54 < 4.20E-02 < 9.41 E-02 < 4.66 E-02 Eu-i 55 < 4.69E-02 < 6.98E-02 3.26E-02 Shaded areas denote positive results.

Areas with a < symbol are less than MDA.

Reference BWXT Report# 0110089, November 13, 2001 W:fLTP Latest Revision/Phase2&3NRCsubmittal.doc 7

Phase 3 - Yard Drain Characterization 1.1 SNEC YARD DRAINAGE SYSTEM INVESTIGATION RESULTS 1.2 Remaining System Descriptions The Saxton Steam Generating Station (SSGS) was demolished along with segments of its supporting yard drainage systems over twenty (20) years ago. However, several sections of underground drainage piping still exist in the South and West sides of the SSGS in-ground structure. These piping systems continue to channel rain water and site run-off away from the site.

Drainage systems surrounding the SNEC CV area have largely been removed as a result of the excavation of contaminated soils in the vicinity of the SNEC CV, including the Weir system piping to the Juniata River in its entirety. In addition, a septic system drain field has been excavated on the South side of the PENELEC Warehouse.

1.3 Initial Inspection Results An inspection and sampling of remaining segments of SSGS Yard System Drainage piping has been performed in two (2) phases. The initial phase involved an effort to investigate and understand the various interconnections that exist between piping segments within the larger 100 acre PENELEC site area and the enclosed -10 acre inner area that surrounds the former coal fired SSGS footprint and existing SNEC facility structures.

Robotics and video camera equipment was used to probe and examine existing piping segments and establish their interconnections. A diagram was then made up of their locations and placement with respect to other site landmarks. The investigation phase also located access points and established existing water flow patterns from these systems. Because water flows away from the site (toward the Juniata River), it was decided that a thorough investigation and sampling of remaining underground piping systems should be performed to rule out the possibility elevated levels of radionuclide contamination having been introduced into the environs through these systems.

1.4 Remaining Yard Drain Piping Sections Examined The Shoup's Run Shunt Line is a 600 foot long 42 inch diameter line that was originally used to channel water from Shoup's Run to below the SSGS dam on the Juniata River thus bypassing the SSGS Intake Tunnel. All of the remaining SSGS area drainage lines on the south and west sides of the SSGS area connect at different points along the Shoup's Run Shunt Line.

At the South edge of the SSGS Boiler Pad, a pipe section was discovered and unearthed that appears to have been a storm drain line originating at the old SSGS facility. This line continues South toward the PENELEC Warehouse where it connects with the grated yard drain opening by this structure. This pipe section then continues further South past the Warehouse into the open field beyond the -10 acre fenced in PENELEC property. It continues South toward Shoup's Run and passes into and out of two (2) access openings. At this point, the line is approximately 6 to 8 feet below the surface (grade level). At the second of the two access openings, the drain line turns toward the Southwest and terminates into the Shunt Line.

The small four (4) bay PENELEC Garage has four (4) sumps (1 per bay). Each of these sumps connect to a common header that passes below the garage floor toward the South and then connects to a -12" diameter line that ties directly into the Shunt Line. This 12" line runs parallel with the South fence that surrounds the -10 acre PENELEC property, and is assumed to connect at some point with the line running by the PENELEC Warehouse (unconfirmed).

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About in the middle of the asphalt covered parking area between the Small Garage and the Warehouse, is a second grated drainage collection point that connects with the Shunt Line through a subsurface pipe traveling West toward and past the Small Garage. From robotics inspection efforts, it appears to travel very close to or beneath the Small Garage on its way to the Shunt Line.

Another connection with the Shunt Line (about 10 feet further northwest and beyond the previous connection) was discovered during a robotic inspection of the interior of the Shunt Line. This pipe serviced an unknown portion of the SSGS area but it is assumed to have been another yard drainage system tie-in that was destroyed during the initial SSGS demolition effort. All the Yard Drain piping sections are depicted in Figure 1.

1.5 Initial Sampling Results (Phase 1)

First phase sampling of Yard Drain piping access points was performed at the time of the initial exploration and mapping of these systems. These samples were grab samples of materials that had collected in these drainage system pipe sections since plant shutdown. GPU Nuclear personnel have assayed these materials and these analysis results are reported below.

Table 1, Phase I Sampling Results Summary (pCilg)

(Sampling points are numbered in accordance with locations marked on Figure 1 below)

Sampling Point Sample No. Description Cs-137 Co-60 Combined TRU 1 SX 1ISD990131 Man-Hole Access With Ladder 1 < 0.19 < 0.04 No Analysis 2 SX1 1SD990132 Man-Hole Access With Ladder 2 0.23 < 0.08 No Analysis 3 SX1ISD990130 First Man Hole Sample Outside Fence 1 < 0.17 < 0.18 No Analysis 4 SX1 1SD990129 First Man Hole Sample Outside Fence 2 0.48 < 0.04 No Analysis 5 SXI 1SD990133 Shunt Line Man-Hole Access < 0.04 < 0.04 No Analysis 6 SXI SD990135 Garage - South of Fence - 1"Z Line 0.072 < 0.05 No Analysis 7 SX10SD99223 Garage Bay #4 - Floor Drain Rim 6.4 < 0.3 < MDA 8 SX10SD990137 Warehouse Storm Drain 12" Feed Pipe 0.52 < 0.04 No Analysis 9 SX1 0SD990024 Warehouse Storm Drain Line 0.16 < 0.06 No Analysis 10 SX10SD990136 Warehouse Storm Main 0.26 < 0.06 No Analysis 11 SX11 SD990134 South - Old Parking Lot Storm Drain 0.21 < 0.03 No Analysis 12 SX12SD99287 Shoup's Run Shunt Line Outfall 1 < 0.12 < 0.11 No Analysis 13 SX12SD99279 Shoup's Run Shunt Line Outfall 2 < 0.06 < 0.07 No Analysis NOTE: Positive results are in bold typeface.

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Figure 1, SNEC Site Grid Map Segment Yard Drain Lines 1.6 Discussion of Initial Sampling and Inspection Results First phase sampling results did not detect any significant or elevated levels of Cs-137 or Co-60 in any of the Yard Drain system piping that was accessed during this work effort. However, a sample taken from within sump number four (4) of the Small Garage did show a Cs-137 concentration of 6 pCi/g. This elevated level of Cs-137 may have be the result of radiological work performed in the Small Garage during previous site remediation efforts.

1.7 Second Phase Sampling and Measurement Effort After reviewing the results from the phase one investigation effort, it was decided that a more rigorous investigation of these piping systems would be appropriate. The reasons for this are as follows:

Grab samples from within an operational drainage system continually collect sediment and washout materials, i.e., materials that have washed into the systems since the time of facility demolition.

Potentially contaminated materials from the time of site operation have most likely been lost by washing through the system and are no longer available for sampling.

Grab samples alone, without internal measurements can easily miss encrusted or fixed contamination within a piping system.

° Some sections of drainage piping were not accessed during phase one activities.

• A more rigorous survey approach would be needed to meet Final Status Survey release criteria.

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To satisfy these concerns, a second phase sampling and measurement effort was conducted. Measurements were made over accessible lengths of pipe and samples were taken from each piping system. The results were compared with previous sampling results. No further actions are planned for Final Status Survey since there were no significant findings in these systems.

1.8 Phase 2 Summary Results Phase 2 results are summarized in the following Table.

Table 2, Phase 2 Summary (Cs-1 37)

Measurement Results Iranae* SamDle Results franael Location dpm/100 cm 2 pCi/g p C1g Small Garage Sumps < 664 to < 2134 < 2.1 to < 3.8 0.2 to 1.4 Central Grated Cover Yard Drain & Line to Shunt < 330 to 910 < 1.0 to < 2 < 0.07 to 1.1 Grated Cover Yard Drain Near Warehouse < 309 to < 1633 < 1.1 to < 1.8 0.7 (one sample) 127 Line South of Small Garage Outside Fence < 336 to < 656 < 1.2 to < 2.3 < 0.1 (one sample)

Unknown 1Z' Drainage Line West of Small Garage < 360 to < 565 < 1.3 to < 2 < 0.1 (one sample)

Drain Line from Warehouse South to Shunt Line <.309 to < 522 < 1.1 to < 1.8 0.11 (one sample)

Shunt Line Access Points < 409 to < 694 < 1.4 to < 2.4 0.04 to 0.34 1.9 Conclusions During October 2001, in-situ gamma spectroscopy measurements and scale/sediment sampling was performed as part of a study of radioactive contamination in embedded piping found at the SNEC site. Spectra (127) were collected in approximately 10 pipes and drainage areas. Additionally, 39 QA/QC spectra were collected, and 29 scale/sediment samples were collected and analyzed in the on-site GPU laboratory. The results show that radioactivity levels are well within site release limits (DCGLs), even using conservative assumptions regarding calculations of in situ radionuclide concentrations. Sampling data compare favorably with measurement results.

Phase 2 measurements confirm that the Yard Drain piping system is below the DCGL's for releasing the site.

In addition, measurements of significant sections of this system suggest that no major source of contamination was released to this system during past site operations. As such, this piping will not need to be resurveyed as part of the Final Site Survey. This piping is located under open land areas already classified as impacted Class 2 or 3 and these areas are documented in Figure 5-1 of the SNEC LTP.

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Phase 3 - Intake Tunnel Characterization 1.0 Description During operation of the SSGS, water was drawn from the Raystown Branch of the Juniata River. A dam was utilized to impound the river in the area of the intake structure, which included the Intake tunnel. The intake water system only provided intake of river water to the SSGS and no discharges to the river were made via this pathway. During freezing weather warm water from the SSGS Discharge Tunnel was diverted and allowed to flow into the SSGS Intake Tunnel via a pathway that utilized the Spray Pond supply piping. This configuration was established in order to prevent ice formation on the intake tunnel screen wash and filtration system components. This flow path, by use of discharge tunnel water, would have provided a mechanism for low level radioactivity to enter the SSGS intake tunnel.

2.0 Summary of Sampling Results Table 1 lists the Intake Tunnel characterization results.

Sediment Sampling: A total of 174 sediment samples were taken throughout the Intake Tunnel. Of these, 142 samples showed positive Cs-137 above MDC. The average Cs-137 value is 0.46 pCi/g and the highest is 1.8 pCi/g (SSGS North Intake Tunnel North Wall / MID-SECTION @ 85'). All sediment samples were <MDC for Co-60 activity.

Core Bore Sampling: Fourteen (14) core bore samples were obtained throughout the tunnel. All core samples were found to be <MDC.

Concrete Samples - Material debris: Sample number SX-CF-2245 core disk crumbled when sliced and was counted as Concrete Debris. Results were <0.27 pCi/g Cs-137 and <0.4 pCi/g Co-60. No other debris samples were collected.

Water Sampling: Five (5) water samples were obtained throughout the intake tunnel. Sample results were

<MDC for Cs-137, Co-60, and Tritium.

Loose Surface Contamination (Smear Surveys): At least 1 smear was obtained for every 100 square feet of concrete tunnel surface area. A total of 335 smears were obtained throughout the tunnel. All smears were

<1000 dpm/1OOcm 2 beta-gamma and <MDC alpha.

Surface Scans Using an E-140N with a HP-210/260 Probe: Survey scan measurements were obtained every 10 feet of tunnel length. Approximately 1 square foot of surface area was surveyed. All Surface Scan survey results were <100 NCPM.

Static Measurements Using a Bicron Micro-Rem: Dose rates were obtained throughout the tunnel approximately every 10 feet at 3 feet from the floor. Dose rates were 2-4 uR/hr throughout the intake tunnel.

3.0 Summary of Survey Results Based on the characterization results the Intake Tunnel can be classified as follows:

- Non-impacted from the Juniata River intake to the point where spray pump water was introduced.

- Class 3 from the point where spray pump water was introduced back to the SSGS.

These classifications will be updated in Chapter 5, (Figure 5-1 and Table 5-2) of the SNEC LTP.

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Table I - Intake Tunnel Characterization Results Sample Number General Location Information Sample Type Isotopic Results Other Results Cs-1 37 Co-60 SXý SD 1622 SSGS South Intake Tunnel, SUCTION Sediment 1.6 pCi/g <.1 pCi/g Q 60' / QC SAMPLE SX SD 1869 SSGS Intake CLEANOUT ACCESS Sediment 0.22 pCi/g <0.14 pCi/g SX IW 1871 SSGS Intake @ CLEANOUT Water <1.5 E-8 uCi/mI <1.5 E-8 uCi/mI <289 pCi/L H-3 SX SD 1914 SSGS North Intake Tunnel @ East Sediment 0.56 pCilg <0.15 pCilg WALL@ 0' SX SD 1915 SSGS North Intake Tunnel @ 10' Sediment 0.43 pCilg <0.09 pCi/g SX SD 1916 SSGS North Intake Tunnel @ 20 Sediment 0.51 pCi/g <0.13 pCi/g SX SD 1917 SSGS North Intake Tunnel @ 30' Sediment 0.56 pCi/g <0.1 pCi/g SX SD 1918 SSGS North Intake Tunnel @ 40' Sediment 0.38 pCi/g <0.14 pCi/g SX SD 1919 SSGS North Intake Tunnel @ 50' Sediment 0.42 pCi/g <0.1 pCi/g SX SD 1920 SSGS North Intake Tunnel @ 60' Sediment 0.85 pCi/g <0.1 pCi/g SX SD 1921 SSGS North Intake Tunnel @ 70' Sediment 0.48 pCi/g <0.09 pCi/g SX SD 1922 SSGS North Intake Tunnel @ 80' Sediment 0.6 pCi/g <0.1 pCi/g SX SD 1923 SSGS North Intake Tunnel @ 90' Sediment 0.34 pCilg <0.07 pCilg SX SD 1924 SSGS North Intake Tunnel @ 100' Sediment 0.74 pCi/g <0.1 pCifg SX SD 1925 SSGS North Intake Tunnel @ 110' Sediment 0.72 pCilg <0.09 pCi/g SX SD 1926 SSGS North Intake Tunnel @ 120' Sediment 0.74 pCi/g <0.13 pCi/g SX SD 1927 SSGS North Intake Tunnel @ 130' Sediment 0.83 pCi/g <0.08 pCi/g SX SD 1928 SSGS North Intake Tunnel @ 140' Sediment 0.82 pCi/g <0.1 pCi/g SX SD 1929 SSGS North Intake Tunnel @ 150' Sediment 0.7 pCi/g <0.1 pCi/g SX SD 1930 SSGS North Intake Tunnel @ 160' Sediment 0.88 pCi/g <0.1 pCi/g SX IW 1953 SSGS North Intake Tunnel/East END Water <1.4 E-7 uCi/mI <1.2 E-7 uCi/mI <286 pCilL H-3 0 30' SX SD 1957 SSGS North Intake Tunnel @ 170' Sediment 0.7 pCilg <0.14 pCi/g SX SD 1997 SSGS North Intake Tunnel North Wall/ Sediment 0.8 pCi/g <0.13 pCilg East END ( 25' SX SD 1998 SSGS North Intake Tunnel North Wall Sediment 1.8 pCilg <0.09 pCVg

/ MID-SECTION @ 85' SX SD 1999 SSGS North Intake Tunnel North Wall/ Sediment 0.7 pCilg <0.08 pCi/g West END @ 160' SX SD 2000 SSGS North Intake Tunnel South Wall Sediment 1.4 pCi/g <0.08 pCi/g I East END 0 25' SX SD 2001 SSGS North Intake Tunnel South Wall/ Sediment 0.85 pCi/g <0.09 pCi/g MID-SECTION @ 95' SX SD 2002 SSGS North Intake Tunnel South Wall/ Sediment 0.7 pCi/g <0.1 pCi/g West END 0 145' SX SM 2033 SSGS North Intake Tunnel WALLS Smear <9.6 E-6 uCi <8.0 E-6 uCi Composite SX CF 2060 SSGS North Intake Tunnel FLOOR @ Core Bore <0.14 pCi/g <0.16 pCi/g 25' SX CF 2061 SSGS North Intake Tunnel FLOOR @ Core Bore <0.12 pCi/g <0.1 pCi/g 65' SX CF 2062 SSGS North Intake Tunnel FLOOR @ Core Bore <0.14 pCi/g <0.14 pCi/g 1 100' SX CF 2063 SSGS North Intake Tunnel FLOOR @ Core Bore <0.14 pCilg <0.15 pCi/g 135' SX CF 2064 SSGS North Intake Tunnel FLOOR @ Core Bore <0.18 pCilg <0.16 pCi/g 165' SX CF 2065 SSGS North Intake Tunnel FLOOR @ Core Bore <0.2 pCi/g <0.17 pCi/g 110' QC SAMPLE SX SD 2066 SSGS North Intake Tunnel PUMP Sediment 0.8 pCilg <0.1 pCi/g SUCTION PIPE @ - 20' SX SD 2067 SSGS North Intake Tunnel PUMP Sediment 0.22 pCi/g <0.1 pCi/g SUCTION PIPE @- 55' SX SD 2068 SSGS North Intake Tunnel PUMP Sediment 0.4 pCilg <0.1 pCi/g SUCTION PIPE 0 - 70' SX SD 2069 SSGS North Intake Tunnel PUMP Sediment 0.55 pCi/g <0.11 pCi/g SUCTION PIPE 0 - 100' SX SD 2070 SSGS North Intake Tunnel PUMP Sediment 1.1 pCi/g <0.1 pCi/g SUCTION PIPE - - 110' SX SM 2071 SSGS North Intake Tunnel PUMP Smear <1.8 E-5 uCi <1.7 E-5 uCi SUCTION PIPES INNER WALL Composite I__I_ COMPOSITE I W:/LTP Latest Revision/Phase2&3NRCsubmittal.doc 13

SX SD 2072 SSGS North Intake Tunnel @ North Sediment 0.6 pCi/g <0.09 pCi/g DOOR DEBRIS SX SD 2073 SSGS North Intake Tunnel @ SOUTH Sediment 0.72 pCi/g <0.06 pCVg DOOR DEBRIS SX SM 2082 F.P. Intake Tunnel CEILING Smear <1.4 E-5 uCi <1.7 E-5 uCi Composite SX SM 2083 SSGS North Intake Tunnel CEILING & Smear <1.7 E-5 uCi <2.0 E-5 uCi WALLS (QC SAMPLE) Composite SX SD 2118 SSGS North Intake Tunnel QC Sediment 0.5 pCVg <0.07 pCi/g SAMPLE @ - 30' SX SD 2119 SSGS North Intake Tunnel QC Sediment 0.5 pCi/g <0.08 pCi/g SAMPLE @ - 70' SX SD 2120 SSGS North Intake Tunnel QC Sediment 0.52 pCi/g <0.14 pCi/g SAMPLE /PUMP SUCTION PIPE INTERNALS Q-20' SX SD 2167 Intake Tunnel 20' West OF 2ND Sediment 0.7 pCi/g <0.1 pCi/g CLEANOUT SX SD 2168 Intake Tunnel 20' E OF 2ND Sediment 0.55 pCi/g <0.1 pCi/g CLEANOUT SX SM 2169 SSGS Intake Tunnel @ East/West 00' Smear <8.9 E-6 uCi <1.2 E-5 uCi TO East 460' Composite SX GW 2170 SSGS Intake Tunnel @ East 100' Ground Water <1.7 E-8 uCi/ml <1.25 E-8 uCVmI <286 pCi/I H-3 SX GW 2171 SSGS Intake Tunnel @ East 320' Ground Water <1.02 E-8 uCi/mI <9.5 E-9 uCi/ml <286 pCi/I H-3 SX SD 2172 SSGS Intake Tunnel WALL/CEILING Sediment 0.09 pCi/g <0.09 pCig COMPOSITE East/West 00' TO East 220' SX SD 2173 SSGS Intake Tunnel WALL/CEILING Sediment 0.6 pCi/g <0.15 pCilg COMPOSITE East 230' TO East 460' SX SM 2174 SMEARS Intake Tunnel 10' West 210' Smear <1.0 E-5 uCi <1.3 E-5 uCi West (QC SAMPLE @ 235 E, 165 W, Composite 425 E)

SX SD 2175 COMPOSITE OF WALL &CEILING Sediment <0.16 pCi/g <0.13 pCi/g SCRAPINGS 10' West TO 210' West_

SX SD 2176 SSGS Intake Tunnel @ West 30' Sediment 0.08 pCVg <0.1 pCi/g SX SD 2177 SSGS Intake Tunnel @ West 40' Sediment 0.17 pCVg <0.13 pCilg SX SD 2178 SSGS Intake Tunnel @ West 50' Sediment 0.11 pCilg <0.15 pCilg SX SD 2179 SSGS Intake Tunnel @ West 60' Sediment 0.17 pCi/g <0.15 pCi/g SX SD 2180 SSGS Intake Tunnel @ West 70' Sediment 0.15 pCVg <0.11 pCi/g SX SD 2181 SSGS Intake Tunnel @ West 80' Sediment 0.11 pCi/g <0.17 pCi/g SX SD 2182 SSGS Intake Tunnel @ West 90' Sediment 0.14 pCi/g <0.16 pCi/g SX SD 2183 SSGS Intake Tunnel @ West 100' Sediment 0.15 pCi/g <0.13 pCi/g SX SD 2184 SSGS Intake Tunnel @ West 110' Sediment 0.3 pCi/g <0.08 pCi/g SX SD 2185 SSGS Intake Tunnel @ West 120' Sediment 0.23 pCi/g <0.06 pCi/g SX SD 2186 SSGS Intake Tunnel @West 130' Sediment 0.35 pCi/g <0.08 pCi/g SX SD 2187 SSGS Intake Tunnel @West 140' Sediment 0.16 pCi/g <0.16 pCi/g SX SD 2188 SSGS Intake Tunnel @ West 150' Sediment 0.18 pCi/g <0.1 pCi/g SX SD 2189 SSGS Intake Tunnel @ West 160' Sediment 0.26 pCi/g <0.12 pCi/g SX SD 2190 SSGS Intake Tunnel @ West 170' Sediment 0.15 pCi/g <0.17 pCilg SX SD 2191 SSGS Intake Tunnel @ West 180' Sediment 0.15 pCilg <0.1 pCi/g SX SD 2192 SSGS Intake Tunnel @ West 190' Sediment <0.19 pCi/g <0.16 pCi/g SX SD 2193 SSGS Intake Tunnel @ West 200' Sediment 0.14 pCi/g <0.12 pCi/g SX SD 2194 SSGS Intake Tunnel @ West 210' Sediment 0.16 pCi/g <0.07 pCi/g SX SD 2209 SSGS Intake Tunnel @ West 10' Sediment 0.1 pCi/g <0.12 pCilg SX SD 2210 SSGS Intake Tunnel @ East/West 00' Sediment 0.2 pCi/g <0.16 pCilg SX SD 2211 SSGS Intake Tunnel @ East 10' Sediment 0.2 pCi/g <0.15 pCi/g SX SD 2212 SSGS Intake Tunnel @ East 20' Sediment 0.19 pCi/g <0.2 pCi/g SX SD 2213 SSGS Intake Tunnel @ East 30' Sediment 0.12 pCilg <0.18 pCilg SX SD 2214 SSGS Intake Tunnel @ East 40' Sediment 0.09 pCi/g < 0.15 pCi/g SX SD 2215 SSGS Intake Tunnel @ East 50' Sediment 0.16 pCilg <0.17 pCi/g SX SD 2216 SSGS Intake Tunnel @ East 60' Sediment 0.09 pCi/g <0.17 pCilg SX SD 2217 SSGS Intake Tunnel @ East 70' Sediment 0.2 pCVg <0.16 pCi/g SX SD 2218 SSGS Intake Tunnel @ East 80' Sediment 0.16 pCilg <0.12 pCi/g SX SD 2219 SSGS Intake Tunnel @ East 90' Sediment <0.18 pCi/g <0.18 pCi/g SX SD 2220 SSGS Intake Tunnel @ East 100' Sediment 0.18 pCVg <0.17 pCVg SX SD 2221 SSGS Intake Tunnel @ East 110' Sediment 0.3 pCvg <0.17 pCVg SX SD 2222 SSGS Intake Tunnel @ East 120' Sediment 0.23 pCVg <0.16 pCi/g SX SD 2223 SSGS Intake Tunnel @ East 130' Sediment 0.2 pCVg <0.16 pCi/g W:/LTP Latest Revision/Phase2&3NRCsubmittal.doc 14

SX SD 2224 SSGS Intake Tunnel @ East 140' Sediment 0.18 pCi/g <0.17 pCi/g SX SD 2225 SSGS Intake Tunnel @ East 150' Sediment 0.13 pCi/g <0.14 pCi/g SX SD 2226 SSGS Intake Tunnel @ East 160' Sediment 0.25 pCi/g <0.08 pCi/g SX SD 2227 SSGS Intake Tunnel @ East 170' Sediment 0.4 pCilg <0.05 pCi/g SX SD 2228 SSGS Intake Tunnel @ East 180' Sediment 0.3 pCilg <0.06 pCilg SX SD 2229 SSGS Intake Tunnel @ East 190' Sediment 0.4 pCi/g <0.06 pCilg SX SD 2230 SSGS Intake Tunnel @ East 200' Sediment 0.6 pCilg <0.09 pCilg SX SD 2231 SSGS Intake Tunnel @ East 210' Sediment 0.2 pCilg <0.06 pCilg SX SD 2232 SSGS Intake Tunnel @ East 220' Sediment 0.24 pCilg <0.06 pCi/g 0.14 pCi/g U-235 SX SD 2233 SSGS Intake Tunnel @ East 230' Sediment 0.23 pCilg <0.06 pCi/g SX SD 2234 SSGS Intake Tunnel @ West 20' Sediment 0.2 pCilg <0.15 pCi/g SX SD 2235 SSGS Intake Tunnel @ East 240' Sediment 0.3 pCi/g <0.09 pCi/g SX SD 2236 SSGS Intake Tunnel @ East 250' Sediment 0.6 pCi/g <0.1 pCi/g SX SD 2237 SSGS Intake Tunnel @ East 260' Sediment 0.6 pCi/g <0.08 pCi/g SX SD 2238 SSGS Intake Tunnel @ East 270' Sediment 0.73 pCi/g <0.08 pCi/g SX SD 2239 SSGS Intake Tunnel @ East 280' Sediment 0.74 pCi/g <0.08 pCi/g SX SD 2240 SSGS Intake Tunnel @ East 290' Sediment 0.76 pCi/g <0.09 pCi/g SX SD 2241 SSGS Intake Tunnel @ East 300' Sediment 0.7 pCi/g <0.12 pCi/g SX SD 2242 SSGS Intake Tunnel @ East 310' Sediment 0.76 pCi/g <0.12 pCi/g SX SD 2243 SSGS Intake Tunnel @ East 320' Sediment 0.76 pCi/g <0.13 pCi/g SX SD 2244 SSGS Intake Tunnel @ East 330' Sediment 0.76 pCi/g <0.13 pCi/g SX CF 2245 SSGS Intake Tunnel @ West 98' Core Bore <0.27 pCilg <0.4 pCi/g SX CF 2246 SSGS Intake Tunnel @ East 120' Core Bore <0.18 pCi/g <0.2 pCi/g SX CF 2247 SSGS Intake Tunnel @ East 120'; QC Core Bore <0.16 pCi/g <0.17 pCi/g SAMPLE.

SX CF 2248 SSGS Intake Tunnel @ East 355' Core Bore <0.2 pCilg <0.2 pCilg SX SD 2264 SSGS Intake Tunnel @East 340' Sediment 0.56 pCilg <0.07 pCilg SX SD 2265 SSGS Intake Tunnel @ East 350' Sediment 0.6 pCi/g <0.11 pCi/g SX SD 2266 SSGS Intake Tunnel @ East 360' Sediment 0.7 pCi/g <0.12 pCi/g SX SD 2267 SSGS Intake Tunnel @ East 370' Sediment 0.5 pCi/g <0.17 pCi/g SX SD 2268 SSGS Intake Tunnel @ East 380' Sediment 0.52 pCVg <0.08 pCi/g SX SD 2269 SSGS Intake Tunnel @ East 390' Sediment 0.4 pCilg <0.07 pCi/g SX SD 2270 SSGS Intake Tunnel @ East 400' Sediment 0.44 pCi/g <0.12 pCilg SX SD 2271 SSGS Intake Tunnel @ East 410' Sediment 0.4 pCi/g <0.13 pCilg SX SD 2272 SSGS Intake Tunnel @ East 420' Sediment 0.5 pCilg <0.15 pCvg SX SD 2273 SSGS Intake Tunnel @ East 430' Sediment 0.45 pCi/g <0.12 pCifg SX SD 2274 SSGS Intake Tunnel @ East 440' Sediment 0.4 pCilg <0.07 pCilg SX SD 2275 SSGS Intake Tunnel @ East 450' Sediment 0.3 pCi/g <0.08 pCi/g SX SD 2276 SSGS Intake Tunnel @ East 460' Sediment 0.17 pCi/g <0.07 pCi/g SX SD 2277 SSGS Intake Tunnel @ East 160' QC Sediment 0.3 pCi/g <0.10 pCi/g SAMPLE SX SD 2278 SSGS Intake Tunnel @ East 90' QC Sediment 0.11 pCi/g <0.15 pCi/g SAMPLE SX SD 2279 SSGS Intake Tunnel @ West 50' Sediment 0.2 pCi/g < 0.14 pCilg SX SD 2280 SSGS Intake Tunnel @ W 150' QC Sediment 0.18 pCi/g <0.09 pCi/g SAMPLE SX SD 2281 SSGS Intake Tunnel @ East 290' QC Sediment 0.8 pCi/g <0.12 pCi/g SAMPLE SX SD 2282 SSGS Intake Tunnel @ East 370' QC Sediment 0.74 pCi/g <0.08 pCi/g SAMPLE SX SM 2310 SSGS Intake Tunnel @ West 20', Smear <1.7 E-5 uCi <1.7 E-5 uCi West 90', East 50', East 250', East Composite 350' SX SD 2330 SSGS South Intake Tunnel @ 0' Sediment 0.6 pCi/g <0.07pCVg SX SD 2331 SSGS South. Intake Tunnel @ 10' Sediment 0.5 pCi/g <0.06 pCi/g SX SD 2332 SSGS South Intake Tunnel @ 20' Sediment 0.5 pCi/g <0.06 pCi/g SX SD 2333 SSGS South Intake Tunnel @ 30' Sediment 0.44 pCi/g <0.10 pCilg SX SD 2334 SSGS South Intake Tunnel @ 40' Sediment 0.5 pCi/g <0.08 pCilg SX SD 2335 SSGS South Intake Tunnel @ 50' Sediment 0.46 pCi/g <0.07pCi/g SX SD 2336 SSGS South Intake Tunnel @ 60' Sediment 0.3 pCVg <0.08 pCi/g SX SD 2337 SSGS South Intake Tunnel @ 70' Sediment 0.4 pCilg < 0.07 pCi/g SX SD 2338 SSGS South Intake Tunnel @ 80' Sediment 0.2 pCi/g <0.05 pCi/g SX SD 2339 SSGS South Intake Tunnel @ 90' Sediment 0.24 pCi/g < 0.04 pCi/g SX SD 2340 SSGS South Intake Tunnel @ 100' Sediment 0.5 pCi/g <0.08 pCi/g SX SD 2341 SSGS South Intake Tunnel @ 110' Sediment 0.4 pCilg <0.10 pCilg W:/LTP Latest Revision/Phase2&3NRCsubmittal.doc 15

SX SD 2342 SSGS South Intake Tunnel 120' Sediment 0.25 pCi/g <0.05 pCig SX SD 2343 SSGS South Intake Tunnel @ 130' Sediment 0.23 pCi/g <0.05 pCi/g SX SD 2344 SSGS South Intake Tunnel @ 140' Sediment 0.3 pCi/g <0.06 pCi/g SX SD 2345 SSGS South Intake Tunnel @ 150' Sediment 0.4 pCi/g <0.05 pCVg SX SD 2346 SSGS South Intake Tunnel @ 160' Sediment 0.8 pCi/g <0.11 pCi/g SX SD 2347 SSGS South Intake Tunnel @ 170' Sediment 0.2 pCilg <0.11 pCi/g SX SD 2348 SSGS South Intake Tunnel @ 180' Sediment 0.33 pCi/g <0.05 pCi/g SX SD 2349 SSGS South Intake Tunnel @ 190' Sediment 0.67 pCi/g <0.08 pCi/g SX SD 2350 SSGS South Intake Tunnel @ 45' 5% Sediment 0.45 pCi/g <0.08 pCi/g QC SAMPLE SX SD 2351 SSGS South Intake Tunnel/WALL Sediment 1.8 pCi/g <0.1 pCi/g SEDIMENT COMPOSITE 0-100' SX SD 2352 SSGS South Intake Tunnel/WALL Sediment 1.3 pCi/g <0.14 pCilg SEDIMENT COMPOSITE 100-190' SXiGW 2353 SSGS South Intake Tunnel @ 30' Ground Water <1.3 E-8 uCi/mi <1.4 E-8 uCi/mI <306 pCi/I H-3 SX GW 2354 SSGS South Intake Tunnel @ 160' Ground Water <1.2 E-8 uCi/mi <2.8 E-8 uCi/mI <306 pCi/I H-3 SX CF 2355 SSGS South Intake Tunnel @ 180' Core Bore <0.15 pCi/g <0.19 pCilg SX CF 2356 SSGS South Intake Tunnel @ 65' Core Bore <0.1 pCi/g <0.12 pCi/g SX CF 2357 SSGS South Intake Tunnel @ 65' QC Core Bore 0.13 pCi/g <0.1 pCi/g I SAMPLE SX CF 2358 SSGS South Intake Tunnel @ 20' Core Bore <0.17 pCilg <0.2 pCi/g SX SD 2359 SSGS South Intake Tunnel @ 125' QC Sediment 0.32 pCi/g <0.09 pCi/g SAMPLE SX SD 2360 SSGS South Intake Tunnel SUCTION Sediment 0.67 pCilg <0.16 pCilg Q -30' SX SD 2361 SSGS South Intake Tunnel SUCTION Sediment 0.17 pCi/g <0.05 pCi/g S I 60' SX SD 2362 SSGS South Intake Tunnel SUCTION Sediment 0.85 pCilg <0.09 pCi/g S -8a0' SX SD 2363 SSGS South Intake Tunnel SUCTION Sediment 0.4 pCi/g <0.15 pCi/g SX1 SID 2364 SSGS South Intake Tunnel SUCTION Sediment 0.3 pCi/g <0.06 pCi/g

@ -120' SX GW 2365 SSGS South Intake Tunnel @ 30'/ QC Ground Water <1.5 E-8 uCi/mI <1.4 E-8 uCi/mI <305 pCi/I H-3 SAMPLE SX SM 2366 South Intake Tunnel INCLUDING QC Smear 2.8 E-5 uCi <1.7 E-5 uCi Composite SX SM 2367 West Intake Tunnel INCLUDING QC Smear <1.8 E-5 uCi <1.7 E-5 uCi Composite I I_ _I W:/LTP Latest Revision/Phase2&3NRCsubmittal.doc 16