Exelon e-mail from Scott Butler to Steven Orth RE ... · In the referenced letter, the Illinois...

- | Anne Boland -FW: Reisponse to IEPA Violation Notice IAnne Boland - FW: Response to IEPA Violation Notice Page 1!

From: <[email protected]>To: <[email protected]>Date: Fri, Feb 3, 2006 1:37 PMSubject: FW: Response to IEPA Violation Notice

Steve - FYI - Please treat as withhold from the public as this was a Certified letter sent to the IEPA

----Original Message-From: Ainger, Kenneth A.Sent: Thursday, February 02, 2006 5:54 PMTo: O'Neill, Thomas S; Haeger, Allan R.; Meister, James R.; Nesbit, Craig; VanVranken, John;Sklenar, Scott E; Melberg, Peg; Miller, Neal F. (Brwd Communications); Polson, Keith; Ambler, Dale F.;Butler, Scott D.; '[email protected]'Subject: Response to IEPA Violation Notice

Attached is our response that was submitted to the IEPA today.

<<0001041.pdf>> <<16841 -00(PRES003)GN-WA002-FIGURE 1.pdf>><<16841 -00(PRES003)GN-WA004 FIGURE 2.pdf»> <<16841 -00(PRES003)GN-WA005-FIGURE3.pdf>> <<16841-0O(PRES003)GN-WA006-FIGURE 4.pdf»<<16841-00(PRES003)GN-WA007-FIGURE 5.pdf>> <<16841-00(PRES003)GN-WA003-FIGURE6.pdf>>

This e-mail and any of its attachments may contain Exelon Corporationproprietary information, which is privileged, confidential, or subjectto copy ight belonging to the Exelon Corporation family of Companies.This e-mail is intended solely for the use of the individual or entityto which it is addressed. If you are not the intended recipient of thise-mail, you are hereby notified that any dissemination, distribution,copying, or action taken in relation to the contents of and attachmentsto this e-mail is strictly prohibited and may be unlawful. If you havereceived this e-mail in error, please notify the sender immediately andpermanently delete the original and any copy of this e-mail and anyprintout. Thank You.

*******************************************************

Exekm.)Exelon Ceneration Company. LLC voviwexe0oncorp.com Nu-learBraidwoxd Station35100 Scuth Rt 53, Suite 84Bracevill!, IL 60407^9619

February 2, 2006BWOE;O01 1

Ms. Beverly BookerIllinois Environmental Protection AgencyBureau of Water, CAS #19P. O. Box 19276Springfield, IL 62794-9276

Subject: Braidwood StationResponse to Violation Notice W-2005-00537

Reference: Letter from Illinois EPA, 'Violation Notice: Exelon Generation -Braidwood Station," dated December 16, 2005

Dear fMs. Booker:

In the referenced letter, the Illinois Environmental Protection Agency (Illinois EPA) issued aViolatiDn Notice to Exelon Generation Company, LLC (Exelon) regarding groundwater quality atBraidvwood Station and adjoining property. The Violation Notice is based on sampling resultsobtained between December 1 and December 12, 2005, that indicate the level of tritiumexceeds the standards set forth in Section 12 of the Illinois Environmental Protection Act andthe Illinois Pollution Control Board's regulations.

The enclosure to this letter contains Exelon's response to the Violation Notice. The responsedescribes our actions to protect and inform the public, cease the release of tritium togroundwater, prevent future release of tritium to the groundwater, and our plans to address theelevated levels of tritium in the existing groundwater.

In accordance with 415 ILCS 5/31, "Notice; complaint; hearing;" subdivision (a)(2)(C), Exelonrequests a meeting with representatives of the Illinois EPA to discuss this matter. We willcontact the llinois EPA to arrange this meeting.

This written response is being submitted within 45 days of Exelon's receipt of the ViolationNotice via certified mail (i.e., December 20, 2005). By submitting this response, Exelon is notadmitting that it has violated the Illinois Environmental Protection Act or the regulations of theIllinois Pollution Control Board. If you have any questions about this response, please contactKenne h Ainger at 630 657-2800.

Respectfully,

Keith J. olsonSite Vice PresidentBraidw:od Station

VIA CERTIFIED MAILRETURN RECEIPT REQUESTED

ENCLOSURE

RESPONSE TO VIOLATION NOTICE W-2005-00537

I. Violation Notice Allegations

On December 16, 2005, the Illinois EPA issued the following in a violation notice toExelon Generation Company, LLC:

Groundwater Quality

No person shall cause, threaten, or allow the release of any contaminant to resourcegrcundwater such that treatment or additional treatment is necessary to continue anexisting use or to assure a potential use of such groundwater, or such that the existing orpolential use of such groundwater is precluded. Exelon Generation - Braidwood Stationmust cease and decease of any further violations of the Act.

Viclation Violation[late Description

12112/05 Sampling results indicate violations of Section 12 of the Act, the GeneralProhibition Against Use Impairment of Resource Groundwater, and thecausing of the groundwater quality standard of tritium (20,000 pCi/L) to beexceeded during the time period and at the location(s) designated below:

RW-2 10.5 ft. depth 58,621 pCVLRW-2 20.5 ft. depth 170,024 pCi/LRW-2 25 ft. depth 223,888 pCi/L

Rule/Reg. Section 12(a), and (d) of the Act, 415 ILCS 5/12, 35 III. Adm. Code620.115, 35 III. Adm. Code 620.301 (a)(1) and (2), and 35 III. Adm. Code620.41 0(e)(3).

12/07/05 Sampling results indicate violations of Section 12 of the Act, the GeneralProhibition Against Use Impairment of Resource Groundwater during thetime period and at the location(s) designated below:

Private well located at horse barn North of pond 1,151 pCi/LRule/Reg. Section 12(a), and (d) of the Act, 415 ILCS 5/12, 35 111. Adm. Code

620.115, and 35 1I1. Adm. Code 620.301(a)(1) and (2).

12/0)6/05 Sampling results indicate violations of Section i2 of the Act, the GeneralProhibition Against Use Impairment of Resource Groundwater, and thecausing of the groundwater quality standard of tritium (20,000 pCi/L) to beexceeded during the time period and at the location(s) designated below:

VB-3-4 58,489 pCVLVB-3-3 43,894 pCULVB-3-2 32,830 pCi/LVB-3-6 53,572 pCULP-4 33,736 pCULRW-2 33,736 pCilL

Rule/Reg. Section 12(a), and (d) of the Act, 415 ILCS 5/12, 35 III. Adm. Code620.115, 35 Ill. Adm. Code 620.301(a)(1) and (2), and 35 Ill. Adm. Code620.41 0(e)(3).

Violation ViolationDate Description

12/01/05 Sampling results indicate violations of Section 12 of the Act, the GeneralProhibition Against Use Impairment of Resource Groundwater during thetime period and at the location(s) designated below:

Pond located just north ofSmiley Rd. and west of the 2,347 pCI/Lblow-down line. 2,464 pCi/L

Rule/Reg. Section 12(a), (d), and (f) of the Act, 415 ILCS 5/12.

II. Exelon Response

The following response describes our actions to protect and inform the public, cease therelease of tritium to groundwater, prevent future release of tritium to the groundwater,and our plans to address the elevated levels of tritium in the existing groundwater. Inorder to further assist the Illinois EPA in an understanding of site conditions, we areincluding in Attachment 1 a summary of key investigative data collected to date at thesitE. These data summaries are considered preliminary, as we are collecting additionaldata and continuing our evaluations, and include:

1. A base map of monitoring locations and key site features.2. Groundwater level contour maps of the shallow and deep zones of the upper

aquifer.3. Estimated tritium concentrations presented in contour maps of the shallow and

deep zones.4. A hydrogeologic cross-section.5. A table summarizing permanent and temporary well monitoring specifications.6. A table summarizing sample results for tritium analyses from wells in the site

area; and7. A table summarizing tritium results from samples collected at private wells.

Protection and Notification of the Public

Exe lon's first priority in response to this issue is the protection of the public. When wedetermined in late November 2005 that tritium in groundwater had likely migrated off theBraidwood Station property, we notified potentially affected residents. Door-to-doorinitial notifications were made to inform them of the status of our investigation, presentthem a fact sheet from the U. S. EPA regarding tritium, offer to sample their private wellsfor the presence of tritium, and respond to their questions and concerns. The results ofthe private well sample analyses, conducted by an independent laboratory, wereprovided to the residents. On December 12, 2005, Exelon conducted a meeting with thepotentially affected local residents to update them on the status of our ongoinginvestigation, explain future actions and address their questions and concerns. Inaddition, we have met individually with a number of residents to address specific

2

4 - -

concerns. A second round of door-to-door updates was conducted with the potentiallyaffected residents on December 29, 2005, during which we provided those residents acopy of our December 29, 2005 news release and invited them to another updatemeeting which was held on January 26, 2006.

In addition to sampling private wells, Exelon obtained permission from potentiallyaffected residents to drill temporary wells on their property and to sample water fromponds on their property to determine the migration of the tritium in groundwater.Exelon's plume characterization team continued sampling, analyzing and notifyingadjoining land owners until the leading edge of the tritium was identified. Exelon hassampled over 31 private wells, drilled and sampled over 150 monitoring wells on and offthe property, and sampled nearby surface water ponds offsite to laterally and verticallyidentify the distribution of tritium in the groundwater.

In order to identify potential users of groundwater in the down-gradient direction of flow(which is to the north) from the blowdown pipeline, Exelon initiated a comprehensive wellinventory and well records search. This search is being conducted through the IllinoisState Water Survey and includes groundwater users that can be identified within a onemile radius of the blowdown pipeline. The location of the wells, their use, depth andconstruction are being compiled for future evaluations. This well inventory, along withpreviously identified well users (private residences where wells have already beensampled), will form the basis of Exelon's notification list. This list will identify additionalprivate, as well as public, water supply users that would be notified if it is determinedthere is a potential for impact to their water supply wells.

Cessation of Release of Tritium to Groundwater

Liquid radioactive effluent releases into the Braidwood Station circulating waterblovvdown line were suspended on November 23, 2005. This action was taken untiladditional information could be collected and testing conducted to ensure the integrity ofthe pipeline at all locations. Braidwood Station has not processed any liquid radioactiveeffluents through the circulating water blowdown pipeline since November 23, 2005.

As a result of suspending liquid radioactive effluent releases into the circulating waterblowdown pipeline, temporary 20,000 gallon water storage tanks are being used to storeliquid radioactive effluents onsite until new radioactive waste processing equipment ismaie operational.

An acoustical leak detection test was completed on January 6, 2006 to verify theintegrity of the circulating water blowdown pipeline. A tethered acoustical sensor headinserted into the pipe was carried by the circulating water blowdown flow providing leakdetection as it traversed along the pipeline length. The sensitivity of the sensor wasdetermined by Exelon Engineering to detect a one gallon per minute leak under normaloperating blowdown line pressure. One anomaly was identified at the end of the pipelinenee r the Kankakee River. This area was excavated and a visual inspection of theexposed pipe determined there was no leak.

Although there have been no liquid radioactive effluent releases through the circulatingwater blowdown pipeline since November 23, 2005, because the vacuum breaker valvesinstalled along the length of the blowdown pipeline have been a source of leaks and

3

spills, a daily visual inspection of the blowdown pipeline is being conducted to verify nogross leakage.

In addition, Exelon has completed the following activities.

* Installation and sampling of over 30 shallow (approximately 15 ft. deep) and over 20deep (approximately 25 ft. deep) monitoring points adjacent to the blowdownpipeline.

* Laboratory analyses of over 60 samples for tritium as a direct indicator of leakagefrom the blowdown pipeline and 45 samples for chloride and sodium which havebeen established as an indicator of the Braidwood Station cooling lake water flowingin the blowdown pipeline.

* Measurement of water levels along the blowdown pipeline and comparison with theregional, shallow groundwater table to determine if significant leaks are creating amounding effect on the water table.

* Comparison of the three dimensional distribution of tritium in the groundwater to theplumes located south of Smiley Road to determine if it correlates with an on-going, oractive release from the blowdown pipeline.

The above activities have relied upon groundwater data collected to date near anddown-gradient of the blowdown pipeline. None of the data have indicated to Exelon andto its hydrogeologic experts that tritium measured in the groundwater on and off propertyhas come from an active leak in the circulating water blowdown pipeline or vacuumbreakers.

Prevention of Future Release of Tritium to Groundwater

Exelon is taking several actions, as described below, to prevent future releases of tritiumintc the groundwater. These include a potential design change involving discharge ofliquid effluent into an additional circulating water blowdown pipeline, a project tosignificantly reduce the overall liquid discharge of tritium from Braidwood Station, and, inthe event of a future spill, procedure changes to create a more effective response tominimize the impact to the environment.

Liquid effluents will not be introduced into the current circulating water blowdownpipeline unless leakage from this pipeline and vacuum breaker valves can be preventedwit>h a high level of confidence. Exelon is currently exploring options for an alternatepipeline for discharge of liquid radioactive effluents that would maintain the currentdischarge point, but eliminate concerns with the existing circulating water blowdownpipeline and vacuum breaker valves.

Additionally, a project is underway at Braidwood Station to minimize liquid radioactiveeffluent releases into the circulating water blowdown pipeline in the future with theinstallation of new water processing equipment in the radioactive waste system. Theseimprovements include state-of-the-art technologies in reverse osmosis and an additionalunit to recycle existing liquid radioactive waste inventory into water that meets our qualityrequirements for the reactor coolant system. Also, Braidwood Station intends to install ameans of converting liquid effluents to gaseous effluents.

4

Exelon is also looking into methods of reducing the production of tritium through variouschanges in reactor core configuration and primary water chemistry. These includepotential changes in the reactor fuel rod design, "burnable poisons" in the reactor core,ani fuel cycle length. Exelon is also partnering with its vendors to explore possible newtechnologies in tritium separation.

Finally, in the event of a future spill, the following actions are being taken to improveExelon's response and minimize the impact to the environment.

1. A corporate environmental manager was assigned the action to institutionalizeExelon's tritium environmental spill response knowledge. The manager willutilize input from the various functional areas to develop an integrated set ofprocedures to mitigate and remediate spills with the potential to containradioactive isotopes. Appropriate personnel will be trained on these procedures.A review of the effectiveness of the procedure development and training will beconducted at a suitable interval following completion.

2. The knowledge of Braidwood Station personnel regarding environmentalregulations and reporting requirements will be enhanced with additional training.Training programs for personnel in the Operations, Chemistry/Environmental,and Radiation Protection Departments will be analyzed to determine additionalknowledge requirements to address low level radioactivity spill reporting andpersonnel will be trained and tested on the changes. General training for allemployees will be reviewed to identify any needed changes.

3. Exelon's applicable procedures/programs will be reviewed to ensure the Illinoisregulations governing radioactive contamination of groundwater are correctlyreflected and implemented in those documents.

Plans to Address Elevated Levels of Tritium in Existing Groundwater

Exelon proposes to address the elevated levels of tritium in existing groundwaterthrough the Illinois EPA's Site Remediation Program (SRP). Participation in the SRP willinclude the following.

1. Conduct of a focused site investigation to characterize the extent ofcontamination. The investigation will focus on tritium. Since November 2005,Exelon has conducted extensive sampling as described above, and iscurrently evaluating the results to determine if additional sampling isnecessary. A well survey, as described above, consistent with SRP rules andIllinois EPA policy, will also be included. Prior to submitting the final SiteInvestigation Report, Exelon will contact the Illinois EPA SRP staff to obtaininput on any additional needs. The Site Investigation Report will besubmitted as soon as possible, but no later than March 24, 2006.

2. Development of remedial objectives. As part of this step, Exelon will not onlyevaluate compliance with Part 620.410(e)(3), but risk to the public as well.Work on developing a Remedial Objectives Report (ROR) will commence assoon as possible, and will be submitted no later than 30 days after IllinoisEPA approval of the Site Investigation Report.

5

3. Preparation of a Remedial Action Plan. Based on the results of the SiteInvestigation and the Remedial Objectives Report, a Remedial Action Plan(RAP) will be prepared and submitted. Options are currently being evaluatedwhich include pumping areas of high concentration and returning thesewaters to the circulating water system. The RAP will include a schedule forall activities from startup to completion, and also provide for quarterly reports.This plan will be submitted within 30 days of approval of the RemedialObjectives Report.

4. Submission of a Remedial Action Completion Report (RACR). Once the RAPis approved, the final remedial design will commence within 30 days and thefinal RACR will be submitted within 30 days of completion.

Tha site has not yet been precisely identified, but generally is shown as the area onfigures 4 and 5. Areas separate from this site, to the east along the routing of theblowdown pipeline, are currently being investigated.

As part of the overall strategy to address this issue, a community relations plan is beingimplemented. The plan builds on Braidwood Station's existing community outreachprogram that has been used, as described above in this response, to conduct multiplecommunications to keep the public informed. Exelon intends to continue this effort.The community relations plan includes development of a website with access to a factsheet on the Braidwood tritium issue, a telephone hotline for interested members of thepublic to acquire information on the issue, and an upcoming community informationnight. The actions in our community relations plan may be adjusted over time, as thecircumstances of this issue evolve. Our current community relations action plan will besubmitted by March 1, 2006.

6

Attachment 1

Summary of Key Investigative Data

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Table 1

Table 2

Table 3

Groundwater Monitoring Locations

Average Groundwater ContoursShallow - January 2006

Average Groundwater ContoursDeep - January 2006

Estimated Tritium ResultsShallow Groundwater Zone

Estimated Tritium ResultsDeep Groundwater Zone

Site Specific Hydrogeologic Profile

Monitoring Well Construction Specifications

Summary of Tritium Results inMonitoring Wells

Summary of Tritium Results atPrivate Wells

DRA}:T Page 1 of 6TABLE 1

MONITORING WELLCONSTRUCTION SPECIFICATIONS

T-LOTV IT t rvumv

BRAIDWOOD STATION

WellNumber

BoriykgTotal Depth

(ft BGS) '

Ground* Surface

(NCG'D)2

WellDiameter(inches)

WellMaterial

ScreenInterval

(ft BGS)

Top of RiserElevation(NGVD)

Screen TopElevation(NGVD)

Screen BottomElevation

(NGVI))

Sticklip

(ftAGS) 4

MW-101

MW-102

MW-103

MW-104

MW-105

MW-105D

MW-106

MW-106D

MW-107

MW-108

MW-1(9

MW-l(10

MW-ll

MWV-11D

MW-112

MW-112D

MW- 13

MW-113D

VB-2-1

VB-2-2

VB-2-21)

VB-2-3

VB-2-4

VB-2-5

V13-2-5D

VB-2-6

VB-2-6D

VB-2-7

CRA 16841 1'rms-lntatiol 3 - Tl

1(.011.08.08.016.024.0

16.0

27.0

16.0

16.0

16.0.

20.0

16.0

26.5

16.0

26.5

16.0

24.0

15.0

15.0

29.5

15.0

15.0

15.0

24.0

15.0

24.0

15.0

599.49

602.42

595.72

596.60

597.29

597.22

599.60

599.70

599.85

599.76

598.81

604.01

603.29

603.17

598.57

598.61

596.10

596.14

601.27

596.82

596.49

595.95

596.08

595.76

595.76

596.01

596.01

600.51

2 PvC32 PVC2 PVC2 PVC2 PVCI PVC2 PVC1 PVC2 PVC2 PVC2 PVC3 PVC4 PVCI PVC5 PVCI PVC6 PVC1 Pvc

PVC1 PVC1 PVCI PVC1 PVC1 PVC1 PVCI PVC

PVC1 PVC

5 tolO6 toll3 to 83 to 8

11 to 1619 to 2411 to 1622 to 2711 to 1611 to 1611 to 16

9.5 to 19.55.5 to 15.521.5 to 26.55.5 to 15.621.5 to 26.55.5 to 15.7

19 to 2410 to 1510 to 15

24.5 to 29.510 to 1510 to 1510 to 1519 to 2410 to 1519 to 2410 to 15

602.77

605.70

598.84

598.80

600.74

598.20

602.73

601.81

603.24

603.10

601.23

607.27

607.20

605.05

602.62

600.85

599.77

596.90

605.71

600.16

598.95

600.16

600.82

599.82

596.78

601.44

596.77

602.04

594.49596.42592.72593.60586.29578.22588.60577.70588.85588.76587.81594.01597.29581.67592.57577.11

590.10577.14591.27586.82571.99585.95586.08585.76576.76586.0l577.01590.51

589.49591.42587.72588.60581.29573.22583.60572.70583.85583.76582.81584.01587.29576.67582.57572.11580.10572.14586.27581.82566.99580.95581.08580.76571.76581.01572.01585.51

3.283.28

3.12.2.203.450.983.132.113.393.342.423.263.911.884.052.243.670.764.443.342.464.214.744.061.025.430.761.53

DRAFTPage 2 of 6

TABLE I


EVLrT CEh. C-CE1.TR AT~fit

BRAIDWOOD STATION

Well Borin5 GroundNumber Total Depth Surface

(ft BGS) I (NCVD)2

WellDiameter

(inches)

Well ScreenMfaterial Interval

(ft BGS)

Top of RiserElevation

(NGVD)

Screen TopElevation

(NGVD)

Screen BottomEletatio(n

(NG VD)

StickUlf

(ft AGS) 4

V13-2-7D

VB-2-8

VB-2-9

VB-2-9D

VB-3-1

VB3-3-2

VB-3-3

VB-34

VB-3-4D

VB-3-5

VB-3-6

VB-3-7

VB-3-7D

VB-3-8

VB-3-9D

VB-3-10

VB-3-10D

VB-1-1

VB-I-ID

VB-1-2

VB-1-21)

VB-1-3

VB-1-3D

VB-l-4

VB-1-4D

VB-1-5V5-B1-5D

VB-1-6CRA 168-1 Prnseitalkio 3- T

25.0

15.0

14.0

28.0

15.0

15.0

15.0

15.0

25.0

15.0

15.0

14.5

24.0

14.5

24.5

13.0

23.5

15.0

32.0

15.0

28.0

15.0

27.5

15.0

28.0

15.028.0

15.0

600.51

598.18

596.38596.49596.27596.18596.18

596.24596.24596.44595.68596.43596.49602.14

599.94

599.64

599.32

600.17*

1 PVC- PVC

PVCI PVCI PVCI PVCI PVCI PVCI PVC1 PVC1 PVCI PVC1 PVC1 PVCI PVCI PVCI PVC1 PVCI PVCI PVC1 PVC1 PVCI PVCI PVCI PVCI PVCI PVCI PVC

20 to 2510 to 159 to 1423 to 2810 to 1510 to 15'10 to 1510 to 1520 to 2510 to 1510 to 15

9.5 to 14.519 to 24

9.5 to 14.519.5 to 24.5

8 to 1318.5 to 23.5

10 to 1527to3210 to 1523 to 2810 to 15

22.5 to 27.510 to 1523 to 2810 to 1523 to 2810 to 15

602.28599.05

600.99601.51600.03601.37600.82

599.49597.04599.51596.62599.28598.44605.62

604.65

603.61

601.50

603.85

605.34

580.51588.18

*

586.38586.49586.27586.18576.18

t

586.74577.24586.94577.18588.43577.99592.14

589.94

589.64*

589.32

590.17t

575.51583.18

t

581.38581.49581.27581.18571.18

581.74572.24581.94572.18583.43572.99587.14

584.94t

584.64t

584.32

45

585.17

1.77

0.87t

4.61

5.02

3.76

5.19

4.64

3.25

0.80

3.07

0.94

2.85

1.95

3.48

4.71

3.97t

2.18

3.68

DRAI:T Page 3of 6TABLE 1


UVrI vTLY f-r I. TIr A rTTd,

BRAIDWOOD STATION

well foring Ground IVell Well Screen Top of Riser Screen Top Screen Bottoyn StickNumber Total Dleptlh Surface Diameter Material Interval Elevation Elevation Elevation t[p

(ft BGS)' (NGVD)2 (inches) (ft BGS) (NGVD) (NGVI)) (NGVD) (ft AGS) J

VB-1-6D 27.0 1 PVC 22 to 27 * * *

VB-1-7 15.0 1 PVC 10 to 15 603.62 * *

VB-'1-7D 26.5 600.48 1 PVC 21.5 to 26.5 602.80 578.98 573.98 2.32VB-1-8 15.0 I PVC 10 to 15 603.36 * +*

V13-1-SD 26.5 600.15 1 PVC 21.5 to 26.5 602.49 578.65 573.65 2.34VB-1-9 15.0 t 1 PVC 10 to 15 601.86 * *

VB-1-9D 27.0 * 1 PVC 22 to 27 * * * *

RW-1 25.0 596.68 1 PVC 5 to 25 599.36 591.68 572 2.68RW-2 24.0 596.59 I PVC 4 to 24 599.30 591.59 571.59 2.71IZW-3 - 24.0 596.24 1 PVC 4 to 24 599.19 592.24 572.27 2.95RWV-4 24.0 596.31 1 PVC 4 to24 598.77 592.31 572.31 2.46Bl.-l 17.0 600.38 I PVC 12 to 17 605.58 588.38 583.38 5.20BL-2 14.5 600.16 1 PVC 9.5 to 14.5 604.84 590.66 585.66 4.68BL-3 23.0 600.60 1 PVC 18 to 23 604.50 582.60 577.60 3.90BL-4 14.5 599.76 I PVC 10 to 15 601.91 589.76 58f476 2.1513L-5 21.0 599.76 I PVC 16 to 21 602.60 583.76 578.76 2.84BL-6 16.5 597.74 . I PVC 11.5 to 16.5 601.83 586.24 581.24 4.09BL-7 14.0 597.57 1 PVC 9 to 14 601.08 588.57 583.57 3.51BL-8 18.0 598.53 1 PVC 13 to 18 602.29 585.53 580.53 3.76

Bl-95 12.5 599.75 1 PVC 7.5 to 12.5 602.75 592.25 587.25 3.00BL-9 21.0 599.60 1 PVC 16 to 21 602.49 583.60 578.60 2.89

BL-9D 29.0 599.65 1 PVC 24 to 29 600.36 575.65 570.65 0.71BL-10 17.0 602.49 1 PVC 12 to 17 605.37 .590.28 585.28 2.88

BL-10D * 32.0 602.43 1 PVC 27 to 32 605.16 575.43 570.43 2.73BL-'1 16.5 59747 I PVC 11.5 to 16.5 600.65 585.97 580.97 3.18

BL-IID 28.0 597.34 1 PVC 23 to28 599.09 . 574.34 569.34 1.75BL-12 17.0 598.03 . I PVC 12 to 17 601.60 586.03 581.03 3.57

BL-12D 28.0 598.10 1 PVC 23 to 28 599.87 575.10 570.10 1.77CRA 16P41 I'mwntnatiol 3-TT

-1-.11-.-.----------..--..- ...

DRAFT Page 4 of 6TABLE 1


%-r I a; " rNr V.%, I A fltI

BRAIDWOOD STATION

Well Boring Ground Well Well Screen Top of Riser Screen Top Screen Bottom StickNunmber Total Depth Surface Diameter Material Interval Elevation Elevation Elevation Up

(ft BGS)' (NGVD) (inches) (ft BGS) (NGVD) (tNGVD) (NGVI)) (ft A GS) 4

BL.-'13 15.0 598.07 1 PVC 10 to'S 601.37 588.07 583.07 3.3013,-13D 24.5 598.05 . I PVC 19.5 to 24.5 600.82 565.55 564.55 2.77BL-14 18.0 59734 1 PVC 13 to 18 601.26 584.34 579.34 3.92

B1-141) 26.5 597.46 1 PVC 21.5 to 265 599.90 575.96 570.96 2.44BL-15 17.5 597.29 1 PVC 12.5 to 17.5 600.98 584.79 579.79 3.69

BL-15D 24.0 597.54 1 PVC 19 to 24 598.50 578.54 573.64 0.96BL-16 17.0 597.12 1 PVC 12 to 17 600.30 585.12 580.12 3.18

BL-16D 24.0 597.28 1 PVC 19 to 24 598.17 578.28 573.28 0.89BL-17 14.5 597.01 1 PVC 9.5 to 14.5 597.62 587.51 582.51 0.61

BL-17D 24.0 597.01 1 PVC 19 to 24 598.1.1 578.01 573.01. 1.1013L-18 14.5 596.82 1 Pvc 9.5 to 14.5 597.59 587.32 582.32 0.77BT.-19 9.0 594.94 I PVC 4 to 9 595.55 590.94 585.94 0.61

BL-20D 28.0 596.89 1 PVC 23 to 28 600.45 573.89 568.89 3.56P-1 14.5 594.90 I PVC 9.5 TO 14.5 595.59 585.40 580.40 0.69P-2 14.5 595.65 1 PVC 9.5 TO 14.5 596.27 586.15 581.15 0.62

P-2D 23.5 595.88 I Pvc 18.5 to 23.5 596.55 577.38 572.38 0.67P-3 14.5 595.69 1 PVC 9.5 TO 14.5 596.26 586.19 581.19 0.57P-4 14.5 1 PVC 9.5 TO 14.5 597.14 * * *

P-4D 27.0 596.46 1 Pvc 22 to 27 599.22 574.46 569.46 2.761P-5 15.0 " 1 PVC 10 to 15 597.06 * * *

P-51D 27.0 596.34 1 PVC 22 to 27 599.37 574.34 569.34 3.03P-6 14.5 1 1 PVC 9.5 to 14.5 597.85 *P-7 14.5 599.77 1 PVC 9.5 to 14.5 600.24 590.27 585.27 0.47P-8 14.5 595.49 1 PVC 9.5 to 14.5 596.24 585.99 580.99 0.75P-9 14.5 598.55 1 PVC 9.5 to 14.5 599.19 589.05 584.05 0.64P-10 14.5 596.08 1 PVC 9.5 to 14.5 596.58 586.58 581.58 0.50P'-li 14.5 595.19 1 PVC 9.5 to 14.5 596.23 585.69 580.69 1.04P-12 14.5 595.56 1 I'VC 9.5 to 14.5 596.13 586.06 581.06 0.57

ClA 1841 l'remnit.ation 3- TI

DRAFTr Page5 of 6TABLE 1


EX ELON G EN ER\A -i ONfi

BRAIDWOOD STATION

Well Boring Ground Well Well Screen Top of Riser Screen Top Screen Bottom Stick

Numnber Total D~epth Surface Diameter MAaterial Interval Elevation Elevation Elevation lip

(ft B1GS)' (NGYVD) 2 (inches) (ft BGS) (NGVD) (NGVD) (NGVD) (ft AGCS) 4

P-13D 27.0 596.11 1 PVC 22 to 27 598.76 574.11 569.11 2.65

1'-14 15,5 1 PVC 10.5 to 15.5 * * * *

P-14D 28.0 1 PVC 23 to 28 * *

D-1 15.( 599.64 1 PVC 10 to 15 603.69 589.64 584.64 4.05

D-1D 27.0 599.82 I PVC 22 to 27 603.77 577.82 572.82 3.95

D-2 15.0 598.78 1 PVC 10 to 15 601.92 588.78 583.78 3.14

D-2D 27.0 598.65 1 PVC 22 to 27 601.47 576.65 571.65 2.82

D-3 15.0 599.00 1 PVC 10 to 15 602.48 589.00 584.00 3.48

D-3D 27.0 598.91 1 PVC 22 to 27 602.22 576.91 571.91 3.31

D-4 15.0 598.48 1 PVC 10 to 15 602.55 588.48 583.48 4.07

D-5 15.0 598.58 1 PVC 10 to 15 602.27 588.58, 583.58 3.69

S1- 14.5 594.99 1 PVC 9.5 to 14.5 595.60 585.49 580.49 0.61

S-ID 28.0 1 PVC 23 to28 4

S-2 14.5 592.72 1 PVC 9.5 to 14.5 593.32 583.22 578.22 0.60

S-2D 23.5 592.72 1 PVC 18.5 to 23.5 593.98 574.22 569.22 1.26

S-3 14.5 592.65 1 PVC 9.5 to 14.5 593.37 583.15 578.15 0.72

S-4 14.5 594.23 1 PVC 9.5 to 14.5 594.63 584.73 579.73 0.40

3-4D 24.5 1 PVC 19.5 to 24.5 * *

9-5 14.5 592.76 1 PVC 9.5 to 14.5 593.44 583.26 578.26 0.68

3-6 14.5 594.99 1 PVC 9.5 to 14.5 595.57 585.49 580.49 0.585-7 13.6 1 PVC 8.6 to 1.336 t 4

5-7D 27.5 * 1 PVC 22.5 to 27.5 *

G-1 14.5 590.70 1 PVC 9.5 to 14.5 595.35 581.20 576.20 4.65

G-2 14.5 590.24 1 PVC 9.5 to 14.5 590.82 580.74 575.74 0.58

G-2D 24.0 1 PVC 19 to 24

G-3 14.5 592.34 1 PVC 9.5 to 14.5 592.93 582.84 577.84 0.59

-I - 14.0 595.27 1 PVC 9 to 14 596.25 586.27 581.27 0.98

F-1 D 24.0 595.27 1 PVC 19 to 24 596.19 576.27 571.27 0.92CRA Th841 I'Pt.strii-itj 1 3-Tl

DRAFT PaTge6of6TABLE 1


BRAIDOLDL -NR. A -J I O N

BRAIDWOOD STATION

Well BoringNumber Total Depth

(ft BGS)

F-2DF-3DF-4DF-51)F-6DF-7D14-8D)

C-1C-IDC-2

C-21)A-I

A-ID

25.025.029.527.027.528.026.014.024.015.527.515.025.0

GroundISurface

(NG VD) 2

594.05594.59

595.00

595.0059.0

*4

WellDiameter

(inches)

I

1

I

I

1I

1

I

1

111

Well ScreenMaterial Interval

(ft BCS)

Top of RiserElevation

(NOVD)

597.26597.36

It

Screen TopElevation

(NGVD)

574.05544.59

Screen BottomElevation

(NGVD)

569.05

539.59

StickUp

(ftAGS) 4

3.212.77

PVCPVCPVCPVCPVCPVCPVCPVCPVCPVC.PVCPVCPVC

20 to 2520 to 25

24.5 to 29.522 to 27

22.5 to 27.523 to 2821 to 269 to 1419 to 24

10.5 to 15.522.5 to 27.5

10to 1520 to 25

595.78595.87

*

586.00576.00

581.00571.00

0.780.87

.F *

*

Notes

' ft BGS - feet below ground surface2 NGVD - National Geodetic Vertical Datum3 PVC - polyvinyl chloride

above ground surface

5 Abandoned

ground surface not yet shot, survey data incomplete

.CRA U1841 Presentalion 3-TI

DRAFT Pagc 'l of 4TABLE 2

SUMMARY OF TRITIUM RESULTSIN MONITORING WELLS

EXELON GENERATIONBRAIDWOOD STATION

Location

A-1A-IDE;L-01E1,-02E.L-03E;L-04E;L-05E L-06E L-07EL-osE-L-09El.-09DEL-10EL-1ODEL-l1EL-ilDEL-12EL-12DfL-13BL-13D'13L-14BL-1i4DBL-15BL-15DBl -16BL-16D13l,-17Bl.-17DBL-18BL-19Bl.-20DC-1C-IDC-2C-2DC-IE-1 DC-2G-2D1D-30-3DC-4C-5Ditch at CulvertDitch by Alpha GateF*1F.] D

Sanmple Name

GWO11106-MB-A-IGWO11106-MB-A-IDGW-111705-]K-BL-0lGW-111705-JK-BL-02GW-111805-JK-BL-15GWV-111805-JK-BL-14GW-111805-JK-BL-13GW-111805-iK-BL-12GW-111805-JK-BL-1lGW-111805-JK-BL-10GW-012506-JL-BL-9

GIV-012506-JL-BL-9DGW-010406-JL-BL-10

GW-010406-Jl,-BL-10DGW-010306-iL-BL-I1

GW-010306-JL-BL-I IDGW-010306-jL-BL-12

GW-010306-JL-B[,-12DGW-010306-Jl.-BL-13

GW-010306-J.-BL-13DGW-010306-JL-BL-14

GW-010306-Jl,-BL-14DGW-010306-JL-BL-15

GW-010306-JL-BL-15DGIV-010306-JL-BL-16

GW-010306-JL-BI-16DGWV-010306-JL-BL-17

GW-010306-JI.-BL-17DGWV-120105-DS-BL-18GW-120105-DS-BL-19GW-010406-JI.-BL-20D

GW-010306-Jll-C-1GW-010306-JL-C-1 DGW-012406-MB-C-2

GW-012406-MB-C-2DGW-010406-J],-D-1

GIV-010406-JL-D-I DGW-010406-JL-D-2

GWV-010406-JL-D-2DGW-010406-11..-D-3

GW-010406-JL-I)-3DGIV-120605-JRB-D-4GWV-120205-MK-D-5

Ditch at Culvert~12/22/0ODitch by Alpha Gate-01/12/06

GW-010306-JL-F-1GI'V-010306-JL-F-l D

Sample Date

1/11/20061/11/200611/17/200511/17/200511/18/200511/18/200511/18/200511/18/200511/18/200511/18/20051/25/20061/25/20061/4/20061/4/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/20061/3/2006

12/1/200512/1/20051/4/20061 /3/2006'I /3/2006

1/24/20061/24/20061/4/20061/4/20061/4/20061/4/20061/4/20061/4/200612/6/200512/2/2005

12/22/20051/12/20061/3/20061/3/2006

3H-Tritimnh (pCilL)

3360701560401021143990

480920383-1047535

13-27-39-35-169

-37-91146-49

3364-91-44

-12610837

-117-80

-140-48147-13-141-165-36

-16S5110

9173

1007-30-44-56

CRA 1.,b41 PrvnlJ.s n 3 - rT.

DRAFT DPage 2 of 4TABLE2

SUMMARY OF TRITIUM RESULTSIN MONITORING WELLSEXELON GENERATIONBRAIDWOOD STATION

Location

FI-2DF-3Dr-4DF-5DF-6DF-7DF-8DG-1G-2C;-3

lW-lol.MW-101MIV-102MIW-103MIW-103MIW-104MW-105htW-105DMIW-106MW-106DhMW-107MlW-losMIW-109NIW-110NIW-Il lMW-l IIDMW-112NIW-112DNlW-113NMW-113DP-lP-10P-liP-12P-13DP.14P-14DP-2P-2DP.3['4P4VPS5P-5DP-6P-7r.8

Sample Name

GWV-01 1206-MB-F-2DGV-01 1206-MB-F-3DGWV-012406-MB-F-4DGWl/-012406-MB-F-5DGWV-012406-MB-F-6DGWV-012406-MB-F-7DGIV-012406-MB-F-SD

GW-120605-JL-G-1GW-120605-JL-G-2GW-120605-11,-G-3

GW-111505-JK-17-DupGW-111505-JK-17

MW-102GW-111505-JK-13-Dup

GW-111505-JK-13MW-104

GW-010406-JL-MW-105GW-010406-JL-MW-105DGW-010406-JL-MW-106

GW-010406-JL-MW-106DGW-111605-JK-1 9GW-111605-JK-20GW-093005-DC-03

GW-010406-JK-MWI IOGW-010406-JL-MW-111

GWO1 0906-MB-MWI bilDGW-010406-JL-MW-112

GW010906-MB-MW112DGWV-010306-JL-MW-113

GW-010306-JL-MW-1 13DGW-120105-DS-1-1GIWV-120605-iL-P-10GW-120605-JL-P-I IGW-120605-J.-'- 12

GW-012506-JL-P-13DGW-012406-MR-P-14

GW-012406-MB-P-14DGWV-010306-JL-P-2

GIV-010306-)L-P-2DGW-120205-MK-P-3GIV-012506-JiL-P-4

GWV-012506-JL-P-4DGW-010306-]L-P-5

GCV-01 0306-JL-P-5DGW-01 1806-MB-P-6GW-1201 05-DS-P-7GW-120605-jL-P-S

Sampl' Date

1/12/20061/12/20061/24/20061/24/20061/24/20061/24/20061/24/200612/6/200512/6/200512/6/200511/15/200511/15/20053/24/200511/15/200511/15/20057/28/20051/4/20061/4/20061/4/20061/4/2006

11/15/200511/15/20059/30/20051/4/20061/4/20061/9/20061/4/20061/9/20061/3/20061/3/200612/1/200512/6/200512/6/200512/6/20051/25/20061/24/20061/24/20061/3/20061/3/2006

12/2/20051/25/2006

1/25/20061/3/20061/3/20061/18/200612/1/200512/6/2005

3H-Tritintn (pCiIL)

5461689-22

1512689575872133878116215758

19702497142169-120-35-2526991

305-104-78-66-127-111400847722484172314761622

2171222537238S2045238432589588

389656166216511012102212

CRA T~]Pe5et11.'

DRAI:T Page 3 of 4TABLE 2



I.ocation

1-9r-9rW-6P

I*:W-2rI;W-2I;W-2rF:W-3F:W-4'-I

S-25-2D

S-35-48-5S-68-7S-7DSG-1SG-2SG-3sw-ISW-2SW-3SW4

\'B-1V1Wl-11DN'B-1-2V1B-1-2DVB-1-3V8-1-3DV\B-14VB-1 -4D\VB-1-5\ B1-5DVB-1 -6VB-l-6DVB-1-7VB-l -70VB-1-8V B-1-8)VB-1-9VyB-1 -9DV B-2-1VB-2-2VB-2-2D

Sample Name

GW-121305-Jl,-P-9-recount(,W-121305-Jl,-Y-9Pond-12/08/05RW-1 -12/04/05

GW-121305-JL-RW2@20'GW-I21305-JL-RW2G25YGW-121305-J.-RW2&10'

GW-120205-Jl,-RW-3GW-120205-JL-RW-4

GW-120605-JL-S-1GW-010306-JL-S-2

GW-010306-JL-S-2DGW-120605-JL-S-3GW-120605-JL-S-4GW-120605-JL-S-5C;W-120605-JL-S-6GIV-012406-MB-S-7

GIV-012406-MB-S-7DSG-1SG-2SG-3

Lake #1-11/30/05GW-012506-J L-SW-2

GW-120205-NW-FTL-LakeGW-120205-SE-FTL.- Lake

VB-1-05/27/2005GIV-010406-JL-VB1-1

GW-010406-JL-VBI-IDGWV-l11705-JK-VB1-2

GW-01 1306-MB-VB1-2DGW- 1 1605-DC-VBi1-3

GW-01 1306-MB-VBI -3D)GW-111605-DC-VBl-4

GW-011306-MB-VBI-4DGW-111605-DC-VB1-5GW-01 1.306-JL-VB I-5DGW-112205-J.-VB1-6

GW-011306-JL-VB1-6DGW-112205-JI..-VBI-7

GWa10906-MB-VBI -7DGW-11I2205- L-VB I-8

GWI010906-MB-VBi -SDGW-1 12205-JL-VB1-9

GW-011306-MF-VBI-9DGW-1 I 1505-DC-VB2-I -Dup

GW-010406-JL,-VB2-2GW-010406-JL-VB2-2D

Sample Date

*12/13/200512/13/200512/8/200512/4/2005

12/13/200512/13/200512/13/200512/2/200512/2/200512/6/20051/3/20061/3/200612/6/200512/6/200512/6/200512/6/20051/24/20061/24/20067/28/20057/28/20057/28/2005

11/30/20051/25/200612/2/200512/2/20055/27/20051/4/20061/4/2006

11/17/20051/13/200611/15/20051/13/2006

11/15/20051/13/2006

11/15/20051/13/200611/22/20051/13/2006

11/22/20051/9/2006

11/22/20051/9/2006

11/22/2005] /13/2006

11/15/20051/4/20061/4/2006

3H-Tritirtt (pCiIL)

271111427855

17116624644254111

1973808362-257

108618744111373154661.31970-21.4246424419683

51295425-132337238206

194313847424130

229289541140-11657

10877107

33702.3852324037

CRA Iw$41 Pre..nuti >n 3 T'

DRAFT Page 4 of 4TABLE 2


EXELON GENERATIONBRAIDWVOOD STATION

l.ocation

\'B-2-3V'B-2-3AIB-2-4\B-2-4V'B-2-5\'13-2-5D\'B-2-6A'B-2-6DVIB-2-7\'13-2-7DVB-2-8

'IB-2-9VB-2-9D

V'B-3-\'B-3-1VB-3-1A'EW3-10V'B-3-l0DVB-3-2

V'B-3-3

VB3-34D\'B-3-5VB-3-6VB-3-7V'B-3-7D\'B-3-8V'B-3-9D

Sattmple Name

GW-1 11505-VC-VB2-3-DupGW-1 11505-DC-VB2-3

GW-1 11505-DC-VB2-4-DupGWV-111505-DC-VB2-4GW-010306-JL-VB2-5

GW-010306-JL-VB2-5DGW-010306-JA-VB-2-6

GW-010306-JL-VB-2-6DGW-010406-JL-VB2-7

GW-010406-J[.-VB2-7DGIV-121405-JS-VB-2-8GW-01 1206-MB-VB2-9

GWV-011206-MB-VB2-9DVB-3-05/11 /2005

GW-111505-DC-VB3-1GW-1 11505-DC-VB3-1 -Dup

GW-010306-JL-VB3-10GW-010306-JI -VB3-lODGW-111505-DC-VB3-2GW-1 11605-DC-VB3-3GW-010306-JL-VB3-4

GW-010306-JL-VB3-4DGW-112205-JL.-VB3-5GW-112205-JL-VB3-6GVV-010306-jL-VB33-7

GW-010306-JL-VB3-7DGW-120205-MK-VB-3-8GW-010406-JL-VB3-9D

Sample Date

11/15/200511/15/200511/15/200511/15/20051/3/20061/3/20061/3/20061/3/20061/4/20061/4/2006

12/14/20051/12/20061/12/20065/11/200511/15/200511/15/20051/3/20061/3/2006

11/15/200511/16/20051/3/20061/3/2006

11/22/200511/22/20051/3/20061/3/200612/2/20051/4/2006

3H-Tritiurn (pCilL)

34603940335036643834102

141244-60-53-10378-65

1521595954601207610873632830438942928679095

53572-126-205171

19605

CRA lN8SII P'n~mtatin3-T2

DRAFT Page l of 1TABLE 3

SUMMARY OF TRITIUM RESULTSAT PRIVATE WELLS


Location Sample Date 3H-Tritiumn (pCiIL)

PW-1 11/30/2005 -26PW-2 11/30/2005 48PW-3 11/30/2005 25PW-4 12/2/2005 43PW-5 1/19/2006 -12PW-7 12/7/2005 -58PW-8 12/8/2005 1367PW-9 12/5/2005 142PW-10 12/7/2005 72PW-ll 12/5/2005 99PW-12 12/7/2005 44PW-13 12/7/2005 -62PW-14 12/14/2005 -118PW-15 12/14/2005 -51

CRA ItbS41 P'rewn;tieo 3-1 3

AMN

in1

DRAFT[ , a . . , . . o . a . s C 4'. a :

~I I

BRAIDWOOD STATIONBRACEULE. ILLINOIS

SrTE SPECIFIC HYDROGEOLOGIC PROFILEJANUARY 2006 (A-A)

COOKST044A-WVERI A ABSOCATEI

I,=

w _

,_ .16841.00 PRZsoo3 (6

0 200 600ft

,/4, ,r: I4 . "

POND

r 40a P*.r?

,i~ ,9,0.

.1

1-iES k eI

t~ ; -" 71-

9i

- f a i

,00

4¼

.,,.

'0 a.

~ ,! K /-. I @; 7- j :e 4

( pOND i ;

k I 32 ;.

000') - ': Ti

A .. "''r 02001 A~7.;201~e ,,,., ii,49:

T(D/ '91

01 - '

V I I

Vi r,1,3 -11)20 , ,. : ;I;2 ,I , , I) ,, , 9(.2s , -,.=:: t- __, _, - ,

V7rH ',- I--,.,. -= > [&t '- -† _

COb4VGUAE

:1', A

'I,z , 1 o

,: t

-2,0--)-200-

LEGEND:

EXISTING FENCE LINEIAPPROXIMATE PROPERTY LINEEXISTING PERIMETER DITCH LIMITSFEEDER DITCH

BLOW DOWN LINEDEEP BLOW DOWN LINE SAMPLING LOCATIONVACUUM BREAKER LOCATIONDEEP VACUUM BREAKER SAMPLING LOCATIONDEEP MONITORING WELL LOCATIONPRIVATE WELL LOCATIONDEEP TEMPORARY WELL LOCATIONPOND SAMPLING LOCATIONDEEP RECOVERY WELL LOCATIONTRITIUM RESULT IN GROUNDWATERTRITIUM CONTOUR

TRITIUM RESULTS 200,000 TO 250,000 (PICOCURRIESILITER)

TRITIUM RESULTS 100,000 TO 200,000






TRITIUM RESULTS 200 TO 5,000

|J |TRITIUM RESULTS 0 TO 200

DRAFT

NOTE:BACKGROUND TRITIUM CONCENTRATION- 200 PCI/LDRINKING WATER STANDARD FOR TRITIUM: 20,000 PCI/LTRITIUM DATA FOR SAMPLES COLLECTED THROUGHJANUARY 25, 2006. CONTOURS WERE GENERATEDUSING LOG VALUES.

figure 5ESTIMATED TRITIUM RESULTS

DEEP GROUNDWATER ZONEBRAIDWOOD STATION

Brace vile, Illinois16a41-00(PRES003)GN-WA007 JAN 30/2006

0 200 600fd

I / ( 35

0- ' ("3)

t i '. ;

i1 j -,Oi,

1 D28 0 G-1

POND: Ia(142)

A : j

17�

-11 � ;, -- , I

- ��-3w 5 1.1-35)

DI; '

COffV L4/1:j_+?

LEGEND:

EXISTING FENCE LINEIAPPROXIMATE PROPERTY LINE

-. EXISTING PERIMETER DITCH LIMITS

FEEDER DITCH

BLOW DOWN LINE

i: - SHALLOW BLOW DOWN LINE SAMPLING LOCATION

v<Il A VACUUM BREAKER LOCATION

VB-3-7 A VACUUM BREAKER SAMPLING LOCATION

M M TRITIUM RESULTS 200,000 TO 250,000 (PICOCURRIESILITER)

Ef= TRITIUM RESULTS 10,000 TO 200,000





TRITIUM RESULTS S,000 TO 10,000

TRITIUM RESULTS 200 TO 5,000

TRITIUM RESULTS 0 TO 200

,I ,v- 0C

P-11 0

PSG- (A

e ,S '.. ti

SW-2 ©R. 0-3 N

f'tA.l i', f0.

@t)

SHALLOW MONITORING WELL LOCATION

PRIVATE WELL LOCATfON

SHALLOW TEMPORARY WELL LOCATION

STAFF GAUGE LOCATION

DITCH SAMPLING LOCATION

SURFACE WATER SAMPLING LOCATION

SHALLOW RECOVERY WELL LOCATION

POND SAMPLING LOCATION

NOTE:BACKGROUND TRITIUM CONCENTRATION: 200 pCi/LDRINKING WATER STANDARD FOR TRITIUM: 20.000 pCULTRITIUM DATA FOR SAMPLES COLLECTED THROUGHl~Il I--- C 21IR ---lT IDC ---------UAT

USING LOG VALUES. figure 4ESTIMATED TRITIUM RESULTS

SHALLOW GROUNDWATER ZONEBRAIDWOOD STATION

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Exelon e-mail from Scott Butler to Steven Orth RE ... · In the referenced letter, the Illinois...

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Transcript of Exelon e-mail from Scott Butler to Steven Orth RE ... · In the referenced letter, the Illinois...