ML061160416
| ML061160416 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 11/02/2005 |
| From: | Jones T Entergy Nuclear Operations |
| To: | Rosenmann L Office of Nuclear Reactor Regulation, State of NY, Dept of Environmental Conservation |
| References | |
| FOIA/PA-2006-0081 | |
| Download: ML061160416 (13) | |
Text
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From:
"Jones, T. R." <tjones2@entergy.com>
To:
'Larry Rosenmann' <Iarosenm @ gw.dec.state.ny.us>
Date:
11/2/05 12:25PM
Subject:
FW: IP2 MONITORING WELLS Attached is GZA info you requested. Please note that is GZA proposed data. This Is not the final product.
Please send me an email conformation upon on receipt.
<<GZA MONITORING WELL PROJECT PLAN (10-28-05).DOC>>
<<GZA FIGURE 1 -
PROPOISED MONITORING WELL LOCATIONS.pdf>>
<<DRN-05-05385.pdf>>
T.R. Jones Vag 1e Iil
" P
...... * "....1 CC:
James Noggle' <JDN@nrc.gov>, "Cox, Mark R" <mcox9O@entergy.com>
Information in this record was deleted in accordan ce witb 8e Freedom of ln UaMU04 FOIA-
%jetniAGIN100001 TMP Paqel~
'~temp\\GW1QOOO1.TMP Pa~ie I Mail Envelope Properties (43C5123D.BE4:14: 11236)
Subject:
FW: IP2 MONITORING WELLS Creation Date:
11/2/05 12:25PM From:
"Jones, T. R." <tjones2@entergy.com>
Created By:
tjones2@entergy.com Recipients entergy.com mcox90 CC (Mark R Cox) nrc.gov kp1_p:).KP-.DO JDN CC (James Noggle).
gw.dec.state.ny.us larosenm (TLarry Rosenmann')
Post Office Route entergy.com kplpo.KP_..DO nrc.gov gw.dec.state.ny.us Files Size Date & Time MESSAhGE 339 11102/05 12:25PM TEXT.htm 1211 GZA MONITORING WELL PROJECT PLAN (10-28-05).DOC 79872 GZA HGURE 1 - PROPOSED MONITORING WELL LOCATIONS.pdf 50340 DRN-05-05385.pdf 115216 Header 493 Options Expiration Date:
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III t/A VI'jrjI I UI-1II'JL VVt:LL October 27, 2005 File No.: 01.0017869.00 John F. Skonieczny, P.E.
Indian Point Energy Center Civil/Structural Engineering Buchanan, New York RE: project plan/Work Plan Monitoring well installation Indian point unit 2 spent fuel storage pool
Dear Mr. Skonieczny,
GZA GeoEnvironmental Inc. (GZA) is pleased to provide this project plan to conduct a site investigation at the Indian Point Energy Center (IPEC).
The purpose of this investigation is to assess the source and extent of the potential leak from the Unit 2 FSB and to assess the hydrogeology of the area around Unit 2 FSB. The locations of the wells are additionally designed to assess total site monitoring requirements at IPEC.
BACKGROUNti As a part of the Independent Spent Fuel Storage Installation (ISFSI) Dry Cask Storage Project currently underway at IPEC, certain modifications are required within the IP2 spent fuel storage building. Among these is the installation of a new crane to assist with the transfer of spent fuel into the dry casks. The installation of this heavier duty crane requires the construction of new foundations for the crane supports and a sub-surface counterweight. It was necessary to excavate to bedrock through the floor of the spent fuel storage building adjacent to the spent fuel storage pool to construct the crane foundations and counterweight.
During excavation, the south wall of the spent fuel storage pool was exposed. On September 2, 2005 and thereafter, two horizontal hairline shrinkage cracks were observed which exhibited signs of moisture. We were told that losses from the pool were calculated to be less than 2 gallons per day. One crack was found to be actively discharging water at a rate of approximately one pint per day. Radiochemical testing by Entergy indicated constituents found in the discharge water to be generally consistent with water typically associated with the spent fuel storage pool; although isotopic analysis appeared to show that the water may have exited the pool liner eight to nine years in the past.
The crack observed to be weeping is reported to be at approximately elevation n6 feet (plant datum) near the west comer of the south wall of the spent fuel storage pool.
The wall at this location is shown on plans to be four-foot thick reinforced concrete with' an interior liner o stainless steel. The concrete floor slab of the pool is shown to be founded directly on drock, excavated to approximately elevationoll eet
acy Smith GZA MONITORING WELL PROJECT PLAN (10-2B-05).DOC Work Plan - Well Installation October 27, 2005 Indian Point Page 2 during pool construction PURPOSE The purpose of this investigation is to provide: initial information on the direction of groundwater flow in the vicinity of the spent fuel storage pool, and additional ground water monitoring locations. The results of these services and additional testing will provide information on the fate of the subject release. Note the resulting information may be incomplete, and may indicate a need for additional field work. The study is being conducted at the request of Entergy in response to a potential leak from the Unit 2 fuel storage pool.
SCOPE OF WORK The following scope of work briefly describes the major tasks to be completed during actions related to the installation of monitoring wells at Indian Point. It is based on our current understanding of site conditions and your needs. Should site conditions be other than anticipated it may be necessary to alter, or expand, the services outlined below:
Pre-Clearing of Borings Proposed monitoring locations will be marked on the ground. Entergy will review these locations.and, as necessary, suggest near-by alternate locations. No borings will be advanced without Entergy's approval.
Prior to drilling the proposed groundwater monitoring wells, GZA will utilize surface geophysical methods and vacuum excavation technologies to pre-clear the approved boring locations to a depth of 5 feet below ground surface (bgs). The geophysical survey will consist of employing electromagnetic metal detectors, utility locating instruments and ground penetrating radar \\(GPR). Non-metallic utilities will be investigated by inserting a flexible steel antenna into the lines if accessible and using the utility locating instruments to detect a signal.
The vacuum excavation technique will utilize high vacuum in combination with an air knife to excavate unconsolidated materials to a depth of 5 feet bgs without the use of equipment that could possibly damage subsurface utilities. All soils removed via this process will be placed in properly labeled 55-gallon drums and stored on-site in a suitable location selected by Entergy. Entergy will be responsible for characterization and disposal of this material.
The above describes the proposed Pre-Clearing measures. It reflects the standard of care being used in our industry at similar facilities..The final decision on where to drill and all costs associated with damaging utilities remains with Entergy.
Boring Advancement/Monitoring Well Installation
cy Smith. G.Z_ MOIOR.N.--GWELL C
PROJET-PLAN_( t0-28-05.--C Work Plan - Well Installation October 27, 2005 Indian Point Page 3 Once the proposed borings have been pre-cleared, GZA will install the monitoring wells in two phases. The borings.will be advanced with a CME track-mounted drill rig that is 13 feet long, 7 feet wide and weighs 15,000 pounds. The drill rig is equipped with a scrubber and exhaust will be hard piped to the exterior if necessary. The track rig uses diesel fuel contained in a steel tank.
Unit 2 FSB Borings GZA will install three monitoring wells in the vicinity of the Unit 2 FSB. Figure 1 presents the proposed monitoring well locations.
One of the three borings will be advanced within the open excavation in-side the Unit 2 FSB.
These borings 'will be advanced WI
->The purpose of these borings is to assess source area concentrations of contaminants potentially emanating from the Unit 2 FSB as well as to assess hydrogeologic conditions of the Site.
The first proposed well, P-1, will be located on the northwest side. of the open excavation within the Unit 2 FSB. The boring will be located approximately im l
m This boring will be used to assess the source area concentrations of contiarnants and to assess the hydrogeology of the bedrock aquifer.
The second proposed well, P-2 will be located a
] __ I..-t"
_This boring will be used to assess the source area
-1 concentrations of contaminants aiii to assess the hydrogeology of the bedrock aquifer.
The third proposed well, P-3, will be locate-I boring will be used to assess the source area concentrations of contaminants and to assess the hydrogeology of the bedrock aquifer.
A schedule 40 carbon steel casing will be drilled five feet into the rock at all three locations.
The rotary-coring drilling technique utilizes a diamond-bit core to remove 'e more from the bedrock. As the cores are extracted, the core is placed back down the borehole.
along with a string of drilling rod. The use of th otary core bit will require water to be used as a drilling fluid. However, the nature o the bedrock should limit the amount of fluids necessary. The volumes of drilling fluids will be measured as they enter the borings and the volume recovered following completion of the borings will be measured.
GZA estimates that 100-gallons of drilling fluid per well will require disposal. The wells will be finished with flushmount manholes with covers. Figure 3a and 3b portray the construction of the open rock monitoring wells proposed at the Unit 2 FSB.
The monitoring well installed within the excavation, P-l, will require extension of the casing to the proposed grade of the future floor. GZA understands that IPEC personnel will be responsible for extending the casing in 5 foot increments during backfilling and
_G46 IVION)TOR ING WELL PROJECT PLAN'(.1 Q-?_q:U5.D.OC -
Paae 4 il Smith - GZA MONITORING WELL PROJECT PLAN (1 0-28-05)D0C Paae 4 ii Work Plan - Well Installation October 27, 2005 Indian Point Page 4 compaction of the excavation. GZA recommends that the first five feet of casing be installed immediately upon completion and a protective cap be placed over the casing to protect the well from inadvertent damage.
Following completion of the borings the wells will be developed to remove accumulated fine material from the borehole. At least twice the amount of drilling fluids lost to the formation from each boring will be developed.
All development water will be containerized on site in yellow 55-gallon drums for subsequent treatment or disposal.
GZA estimates that approximately 100-gallons of water per well will be generated from well development.
The three borings will be converted to multilevel monitoring wells following geophysical borehole logging, fracture mapping and packer testing. The construction of the multilevel sampling system within the open rock well is described below under section Multilevel Sampling Equipment.
Transformer Yard Borings The fou
-fifth and sixth roposed wells, PA P-5, and P-6 will be advanced outside the
~approximately 30 feet bgs) using a combination of £4 hollow-stem augers for advancement through overburden 'and rotary coring for advancement through rock. The purpose of these wells is to assess the width of the plume potentially emanating from the Unit 2 FSB and detected in monitoring well MW-111.
A seventh proposed well, P-7, will be advanced at the farth es int within'the Transformer Yard The boring will be completed to the (approximately 45 feet bgs). Thfe purpose of this well is to assess whet er contaminants ave entered the backfill around Discharge Canal.
The eighth proposed well, P-8, will be completed on thq Wsde of the Discharge Canal within the loading bay of the Unit 2 Steam Turbine-'uilding. This well will be used to assess whether there is hydraulic communication between groundwater on the (Afl east side of the Discharge Canal and the west side of the Discharge Canal. In addition, this well will be used to assess whether contaminants have migrated west of the Discharge Canal.
A ninth proposed well, P-9, will be installed on thd Uiif the Discharge Canal near the security building. The well will be installed outside th"controlled area as close 9'
as possible to the point where the Drainage Canal transitions from a rip-rap embankment to sheet pile. The purpose of this well is to provide information-concerning potential migration of contaminants along backfill of the Drainage Canal to the Hudson River.
-ASrnt7-GZK,---iTORING WELL PROJECT PLAN (10-28-05).PO0
.P~age5-l Work Plan - Well Installation October 27, 2005 Indian Point Page 5 These borings will be converted to permanent monitoring wells constructedU lotted PVC screen penetrati n
into the water table and CPVC riser pipe to grade.
The screened interval will be
"'Tackfiiled with filter packnmaterial to two feet above the screen. Aentonite plug will be installed over the filter pack. The remaining annular space aroun the wells
" 1" will be grouted to grade and the well will be completed with a flush mounted manhole.
Figure 4 portrays the construction of the screened monitoring wells.
Following completion of each monitoring well, the Well will be developed in accordance with NYSDEC protocols.
GZA estimates that approximately 100-gallons of development water per well will be generated during installation of these wells.
All drill cuttings, drilling fluids and development water will be containerized in yellow 55-gallon drums and staged on-site. Entergy will be responsible for characterization and disposal of the wastes.
Multilevel Sampling Equipment GZA will use the Waterloo multilevel sampling system supplied by Solist. Product cut sheets are provided as Attachment 2. Figure 5 presents a series of schematics for the system. The System uses modular components which form a sealed casing string of various casing lengths, packers, ports, a base plug and a surface manifold. This allows accurate placement of ports at precise monitoring zones. Monitoring tubes attached to the stem of each port indj ally connect that monitoring zone to the surface. The standard system is built orLW(O0 mm) Schedule 80 PVC to fi(ý 100 mam) boreholes and uses#* ()15 mm) long packers. Stainless stee-rconijbnents, custom packer materials and sizesTeflon tubing are available.
Monitoring ports are constructed frorr "tainless steel. Ports are isolated by packers at C.
.each desired monitoring zone and are inidrividually connected to the surface manifold with narrow diameter tubing. Thus formation water enters the port, passes into the stem, up into the monitoring tube attached to the stem, to its static level. A sampling pump and pressure transducer will be dedicated to each monitoring zone by attachment to the port stem.
The manifold completes the system at surface. It organizes, identifies, and coordinates the tubes and/or cables from each monitoring zone. The manifold allows connection to each transducer in turn, and a simple, one-step connection for operation of pumps. When dedicated pumps are selected, it allows individual zones to be purged separately, or purging of many zones simultaneously to reduce field times.
Permanent packers ensure long term integrity of seals in cored bedrock holes and cased wells. They use a water activated expansion sleeve fitted over the perforated packer body. A layer of porous plastic distributes water evenly to the packer expansion material.
A Rubber/Kevlar/Rubber sheath envelops the expansion material. The Kevlar layer provides strength to bridge across large fissures. The pliant gum rubber forms an
Work Plan - Well Installation October 27, 2005 Indian Point Page 6 effective seal against the borehole wall. Water is added to the inside of the sealed casing string after installation. The water passes through the packer body into the expansion sleeve, causing the material to expand. Thus an engineered seal is permanently formed against the borehole wall.
GZA will employ the Waterloo Systems gas driven Solinst Double Valve Pumps with stainless steel and Teflon valves. A pump is connected directly to the stem of each port and dual line polyethylene or Teflon tubing connects the pump to the wellhead manifold. The pumps will utilize manual pump control units. They have quick-connect couplings with only a single connection to the manifold required. Samples from all levels are easily and rapidly obtained. Purging from some or all levels simultaneously is accommodated by the multi-purge feature of the manifold.
Rock Face Logging GZA will provide an expert geologist or geologic engineer to log the rock face exposed in the Unit 2 FSB. The bedrock face will be mapped and logged for lithology, bedding planes, fractures, joints and faults. The three dimensional orientation of the surfaces will be recorded and evaluated. The information will be used to understand the fracture orientations and their control on the hydrologic processes at the site.
Geophysical Well Logging GZA will conduct down-hole geophysical well logging of the three borings completed adjacent to Unit 2 FSB, prior to completing the wells as permanent monitoring wells.
The well logging will consist of borehole temperature logging, fluid resistivity, 3-arm caliper logging, acoustical televiewer logging (ATV), and heat pulse flow meter logging.
- The ATV log will provide data on fracture depth and orientation. The caliper log will provide information on depths of bedrock fractures. The fluid temperature and fluid resistivity will provide information as to which fractures are productive.
Packer Testing Based upon review of the geophysical well logging results, GZA will select discreet intervals to conduct packer testing to assess hydraulic conductivity within the bedrock.
Parker tests will be performed using a double inflatable bladder and straddle packer assembly with a ten foot long testing zone. Packer testing will begin at the highest testing zone and continue down the length of the uncased bedrock. Packer test intervals and test pressures will be determined in the field and recorded by GZA personnel. The raw data will be reduced in the office and hydraulic conductivity values will be calculated using a computer program called Permcalc, developed by GZA based on the methods presented in the Groundwater Manual, U.S. Department of the Interior, Revised Reprint 1981. The packer test equipment and set is portrayed in Figure 6.
Elevation Survey
G--
M0141TORITRNG WELL PROJECT P.LAN(10-28-0.5)DOC Work Plan - Well Installation October 27, 2005 Indian Point Page 7 GZA will subcontract a licensed surveyor to locate and survey each of the previously installed monitoring wells at the Site. The longitude and latitude of each feature will be measured to the nearest second and the elevation of each feature will be measured to one-hundredth of a foot. The elevation of each monitoring well will be referenced to on-site datum. This information will be required prior to installing the new monitoring wells in order to locate the proper depths for screening the new monitoring wells. In addition, several catch basins and drainage points will be surveyed to determine their exact locations and elevations.
The elevation of ground surface and the rim of each monitoring well will be determined, by standard differential leveling techniques, relative to the facility datum, Entergy will provide the elevation of a suitable existing benchmark.
Hydraulic Conductivity Tests GZA will conduct hydraulic conductivity "pump/drawdown tests" at each of the existing groundwater monitoring wells as well as the six proposed scieened monitoring wells.
The test generally identifies the rates of rising water through the surrounding soils for which the test is being conducted. Hydraulic conductivity and transmissivity are then calculated from those results.
At each of the tested monitoring wells, the resting (static) water level will be measured along with the depth and diameter of the well casing. Then, an electrical submersible pump will be utilized to drawdown water in the well. The pumping rate will be adjusted until a steady state is achieved. Discharged water will be pumped to 275-gallon plastic holding tanks. GZA estimates that approximately 350-gallons of water will be generated for each well. Entergy will be responsible for disposal of the waste water. Elapsed time and water levels will then be manually recorded and recorded by a vibrating wire transducer and data logger system at 10-second intervals. The test will be repeated at each tested monitoring well.
The resultant data will be evaluated to assess the hydraulic conductivity of the formations.
Groundwater Sampling and Analysis Following installation of the new monitoring wells, GZA will collect groundwater samples from each of the previously installed wells and the newly installed wells.
Groundwater samples will be collected using USEPA low flow procedures.
Groundwater samples will be collected from five feet below the water table or adjacent to high permeability flow zones as documented by geophysical logging.
A decontaminated, stainless steel electrical submersible pump with controller and dedicated tubing will used to perform the groundwater sampling activities. The wells will be pumped for purging and sampling at a flow rate of between 250 to 500 mL per min (mlimin).
Field parameters, including pH, specific conductivity, turbidity, dissolved oxygen, temperature, and ORP, were measured approximately every five (5)
Work Plan - Well Installation October 27, 2005 Indian Point Page 8 minutes during the purge process at each well using a multi-parameter water quality system. Purging will cease when all or most field parameters have stabilized to within the range specified in the USEPA guidance document.
Groundwater samples will be given to IPEC personnel who will be responsible for chemical analysis.
Installation and Monitoring of Pressure Transducers In order to better understand the hydrogeology at the Site, GZA will temporarily install In-situ Mini-Troll pressure transducers in existing on-site groundwater monitoring wells as well as the newly installed wells. In addition, GZA will install two still wells which will house pressure transducers. One still well will be installed onthe south side of the Drainage Canal within the Hudson River. The second still well will be installed on the south end of the Drainage Canal within the Drainage Canal proper. Figure 7 shows a detail of the proposed still wells.
'In order to install a transducer within well U3-T1, located on the bottom floor of the Unit 3 Turbine Building. GZA will need to raise the existing stand pipe by 1.5 feet in order to minimize potential seepage of groundwater that is under pressure beneath the slab. The additional 1.5 feet of one-inch diameter PVC riser pipe will be secured to the existing riser pipe using a PVC coupling and PVC glue. Figure 8 portrays a schematic of the modifications to this well.
The pressure transducers will be set one-foot off the bottoms of the wells with a maximum of 100 feet of water column above the transducer. The transducers will be set to record water levels in the wells on at specific intervals. The informaiion will aid in assessing tidal influences on groundwater at the Site as well as assessing the flux of groundwater across the Site.
Site Investigation Report GZA will incorporate the results of the field investigation into a Site Investigation Report. The report will include a site history section which will include a summary of previous reports and historical information. The field investigations sections of the report will describe the activities conducted and the results obtained and present our opinions regarding hydrogeologic conditions, groundwater contamination, and remedial actions that may be required GZA will present a conceptual site model in the report indicating our understanding of the hydrogeology and contaminant fate and transport mechanisms at the Site.
SCHEDULE Surface Geophysical Survey October 26 thru November 4 Vacuum Excavation Services November 14 through 17 Pressure Transducer Installation October 20 and October
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~j7~Thith -tZA MONITORING WELL PROJECT PLAN (1 0-28-05 DC Page9~
Work Plan - Well Installation Indian Point October 27, 2005 Page 9 Installation/Development of Well P-1 Installation/Development of Wells P-2, and P-3 Borehole Logging of P-i Borehole Logging of P-2 and P-3 Rockface Logging Packer Testing of P-I Packer Testing of P-2 and P-3 Installation of Multilevel Sampling Equip. P-1 Installation of Multilevel Sampling Equip. P-2, P-3 Installation of Wells P-4 through P-9 Hydraulic Conductivity Testing Groundwater Sampling of New Wells November 7 through 14 November 17 through 28 November 15 November 29 and 30 November 15 November 16 Decemberil, and 2 November 17 December 5 and 6 November 29 through December 12 December 12 through December 15 December 15 through December 19 We appreciate the opportunity to be of services to you. Should you have any questions or comments, please feel free to contact David at (212) 594-8140.
Very truly yours, GZA GEOENVIRONMENTAL, INC David M. Winslow, Ph.D., P.G.
Senior Project Manager Matthew Barvenick Senior Principal Michael Powers Consultant/Reviewer Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure.6 Figure 7 Figure 8 Proposed Monitoring Well Locations Blow up of Unit 2FSB Open Rock Well Schematic Screened Monitoring Well Schematic Multilevel Sampling System Schematics Packer Test Schematics Still Well Details U3-T1 Modification Schematic Product Cut Sheets for Waterloo Multilevel Sampling Unit Cc: Daniel C. Stapleton, Principal
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