KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

# Groundwater Assessment for F006 Sludge Delisting Final Effluent Ponds

BWX Technologies, Inc. Mount Athos Site Lynchburg, Virginia

Prepared for:

BWX Technologies, Inc. Lynchburg, Virginia

Prepared by:

Shaw Environmental & Infrastructure, Inc. 312 Directors Drive Knoxville, Tennessee 37923

July 2002 Revision 0KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## i 

# Table of Contents

Page

1.0 Purpose.................................................................................................................... ................1 2.0 Objectives of the FEP Sludge Delisting Petition ....................................................................1 2.1 Delist FEP Sludge......................................................................................................... .1 2.2 Clarify Regulatory Status of the FEPs...........................................................................2 3.0 Background................................................................................................................. ............2 4.0 Use of Groundwater Monitoring Data in Delisting Petitions .................................................6 5.0 Relevant Groundwater Monitoring Data ................................................................................7

5.1 FEP Groundwater Data..................................................................................................8

5.2 Landfill 1 Groundwater Data.......................................................................................10

6.0 FEP Risk Assessment ........................................................................................................ ...11

7.0 Conclusions................................................................................................................ ...........12

8.0 Recommendations............................................................................................................ .....13

9.0 References................................................................................................................. ............14

Tables FiguresKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## ii 

# List of Tables

Table Title Follows Text

3-1 Operating Histories of the Final Effluent Ponds 5-1 Final Effluent Pond Groundwater Monitoring Data, Well FEP-3 5-2 Final Effluent Pond Groundwater Monitoring Data, Well FEP-2 5-3 Final Effluent Pond Groundwater Monitoring Data, Well FEP-1 5-4 Final Effluent Pond Groundwater Monitoring Data, Well MWA-17

5-5 Final Effluent Pond Groundwater Monitoring Data, February 2001 Sampling Event

5-6 Final Effluent Pond Groundwater Monitoring Data, May 2001 Sampling Event 5-7 Final Effluent Pond Groundwater Monitoring Data, August 2001 Sampling Event 5-8 Final Effluent Pond Groundwater Monitoring Data, November 2001 Sampling Event

5-9 Final Effluent Pond Groundwater Monitoring Data, February 2002 Sampling Event 5-10 Landfill 1 Groundwater Monitoring Data, February 2001 Sampling Event 5-11 Landfill 1 Groundwater Monitoring Data, May 2001 Sampling Event 5-12 Landfill 1 Groundwater Monitoring Data, August 2001 Sampling Event 5-13 Landfill 1 Groundwater Monitoring Data, November 2001 Sampling Event 5-14 Landfill 1 Groundwater Monitoring Data, February 2002 Sampling EventKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## iii 

# List of Figures

Figure Title Follows Text

3-1 Schematic of Water Flow 5-1 Groundwater Monitoring We lls, Final Effluent Ponds

5-2 Fluoride Concentration in FEP-2 Effluent (Outfall 701) 5-3 Groundwater Monitoring Wells, Landfill 1KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## iv 

# List of Acronyms

BWXT BWX Technologies, Inc. CMTD Composite Model for Leaching Mi gration with Transformation Products

COI constituents of interest

DCE dichloroethene DEQ Virginia Department of Environmental Quality EPA U.S. Environmental Protection Agency Region 3

FEP Final Effluent Pond

HBL health-based levels

HSWA Hazardous and Solid Waste Amendments of 1984

LLR low-level radioactive

MCL maximum contaminant level μg/L micrograms per liter NRC Nuclear Regulatory Commission

PA Pickle Acid

PCE tetrachlorethene RCRA Resource Conservation and Recovery Act

RBC risk-based concentration

TCE trichloroethene TSS total suspended solids VC vinyl chloride VDWM Virginia Department of Waste Management VHWMR Virginia Hazardous Waste Management Regulations VOC volatile organic compound VPDES Virginia Pollutant Discharge Elimination SystemKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 1 

# 1.0 Purpose

The BWX Technologies, Inc. (BWXT) Mt. Athos S ite near Lynchburg, Virginia is pursuing the waste exclusion (delisting) of F 006 suspended solids that accumulate in the Final Effluent Ponds (FEP) at the Mt. Athos Site. This petition follows the successful delisting of the F006 filter cake. This report summarizes the groundwater monitoring data that the U.S. Environmental Protection Agency (EPA) Region 3 has requested in support of the delisting effort; presents an analysis of the data; discusses the significance of the data from a risk assessment perspective; and makes recommendations to support the delisting petition.



# 2.0 Objectives of the FEP Sludge Delisting Petition

In pursuing a waste exclusion for all past and future generation of F006 suspended solids that accumulate in the FEPs, BWXT intends to accomplish the following two objectives:

• Delist the listed F006 solids that have accumulated in the FEPs, thereby releasing all past and future generation of FEP sl udge from management as an F006 listed hazardous waste under the Resource Conser vation and Recovery Act (RCRA).

• Clarify the regulatory status of the FE Ps as non-hazardous surface impoundments, thereby resolving all th e outstanding RCRA regulator y issues concerning the storage of the listed F006 solids in the FEPs.

The following two sections briefly discuss each of these two objectives in more detail.

2.1 Delist FEP Sludge BWXT intends to apply for a waste exclusion fo r all past and future generation of F006 solids that accumulate in the FEP sludge. The F006 su spended solids are one of several waste streams that have contributed solids, in the form of total suspended solids (TSS), to the FEPs. Therefore, to address both the past and future genera tion of F006 solids, the sludge characterization program must include the following two components:

• BWXT will sample and analyze the FE P sludge to characterize the past generatedF006 and non-hazardous solids discharged to the ponds.

• BWXT will use the filter cake data s upplied in support of the F006 filter cake delisting to characterize the current and future generated F006 suspended solids that carry over to the FEPs. The F006 suspended solids carry over to the FEPsKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 2 will be sampled and analyzed to confirm that the filter cake data is appropriate for this purpose.

The details of the waste characterization program will be presented in a revised sampling and analysis plan.

2.2 Clarify Regulatory Status of the FEPs The FEPs are an integral part of BWXT’s indus trial wastewater treatment system, approved and permitted by the Virginia Department of Envir onmental Quality (DEQ). BWXT would like to continue using the ponds in this capacity. The re gulatory status of the ponds and the ability of BWXT to continue using the ponds in their pr esent capacity were called into question by a November 7, 1990 inspection conducted by the Vi rginia Department of Waste Management (VDWM) (1). The 1990 inspection determined th at some of the wastewater treatment solids discharged to the FEPs (as TSS) should be classified as an F006 listed waste.

BWXT believes that a successful delisting of the past-generated FEP sludge and the currentlygenerated F006 suspended solids should resu lt in a determination by the DEQ that:

• The FEPs are not hazardous waste surface impoundments

• The waste exclusion should resolve any potential RCRA regulatory issues associated with the past and future mana gement of the sludge in the FEPs.



# 3.0 Background

The FEPs are two surface impoundme nts located near the James Rive r at the northeastern (plant grid north) side of the Mt. Athos Site. FEP- 2 is closest to the James River and FEP-1 is located hydraulically upgradient of FEP-2 to the southwest (p lant grid south). The FEPs, as part of the DEQ-approved industrial wastewater treatment system, are surface impoundments that provide equalization of the liquid effluent for control of pH and suspended solids. In this capacity, the ponds are a critical unit operation in the wastewater treatment pr ocess that maintains compliance with BWXT’s existing Virginia Pollutant Disc harge Elimination System (VPDES) permit.

The facilities at the BWXT Mt. Athos Site generate wastewaters that are treated in five distinct wastewater treatment systems. These waste stre ams are categorized as e ither radioactive or nonradioactive. A schematic of the current water flow at the site is presented in Figure 3-1. Treated wastewater from non-industrial proc esses is discharged to FEP-1, while treated wastewater from industrial processing operations is discharged to FEP-2. A deta iled description of the processKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 3 operations that generate wastewat er and the wastewater treatment systems at the Mt. Athos Site is presented in the Process Description secti on of the Draft Final Effluent Ponds 1 and 2 Delisting Petition (2).

The contributing waste treatment systems and othe r significant discharges into each FEP are

identified below:

• FEP-1: Non-Industrial Processing Oper ations Wastewater Discharges (NonRadioactive)

− Water production (deionized and make -up non-contact cooling water) waste treatment system

− Once-through non-contact cooling wate r (no treatment system required)

• FEP-2: Industrial Processing Oper ations Wastewater Discharges

− Pickle acid (PA) waste treatment system (non-radioactive)

− Low-level radioactive (LLR) tr eatment system (radioactive)

− Grit blast waste treatment system.

In addition to the four waste treatment systems li sted above, there is a sanitary waste treatment system that treats domestic waste from the Mt. Athos Site. Treated water from this system bypasses the FEPs, and is combined with the effluent from FEP-1 (Outfall 601) and FEP-2 (Outfall 701) in a mixing chamber before the combin ed effluent is discharged to the James River (Outfall 001) through a diffuser system.

The treated wastewater streams at the site have di scharged to different FEPs at different points in time. Table 3-1 presents an operating history of the FEPs.

FEP-1 was put into service in 1973, with a nom inal capacity of 2,000,000 gallons. The pond

received treated wastewater from all waste tr eatment systems from 1973 through 1979. In 1979, FEP-2, at a nominal capacity of 1,900,000 gallons , was placed into service. Both ponds were constructed using a clay/soil liner. When FE P-2 was initially placed in service, treated wastewater from all waste treatment systems was routed to FEP-2 while a portion of the accumulated sludge was removed from FEP-1. After 1980, the treated wastewater stream discharges were divided between the two FEPs.

From 1979 to 1992, FEP-1 received treated water fr om the PA wastewater treatment system, the sanitary wastewater treatment system, and the water production wastewater treatment system.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 4 FEP-2 received treated water from the LLR wastew ater treatment system only. In 1992, the treated water from the PA system was diverted to FEP-2. In 1992, the sanitary treatment process was improved and the treated effluent from th is system no longer discharged to FEP-1.

The sludge in the FEPs is the carryover of susp ended solids from the treatment of the industrial wastewaters generated at the Mt. Athos Site. The suspended solids originate from the clarification, filtrati on, and dewatering processes in the PA, LLR, water production, and grit blasting wastewater treatment systems. The PA and LLR treatment systems both use lime to precipitate dissolved fluoride as calcium fluoride. Liquid caustic is added after lime addition to increase the pH further to precipitate metals as metal hydroxides. The wastewater in both systems is then filtered in a microfiltration system to remove suspended solids. When the microfiltration units are taken off-line for maintenance, the water bypasses the units and suspended solids are removed in either the grit blasting clarifier (PA syst em) or the LLR system clarifier. The wastewater treatment sludges gene rated from these filtration and clarification processes are dewatered into a filter cake accepta ble for land disposal. The filtered water from the PA and LLR microfiltration units, clarifiers, and filter presses all discharge to FEP-2. The chemical compositions of the susp ended solids that carry over into the FEPs from the PA and LLR wastewater processes are virtually identical to the solids in their respective filter cakes. The suspended solids that enter the FEPs are the result of the small inefficiencies in the filtration and clarification processes that generate the filter cakes. The FEPs have received suspended solids from both the PA and LLR wastewater treatment systems.

In June 1990, BWXT determined that the PA filt er cake contained trace levels of special nuclear materials (i.e., enriched uranium at levels less than 30 picoCuries per gram). BWXT reported this finding to the Nuclear Regulatory Commissi on (NRC) and initiated an investigation to eliminate the source of the radiological contamin ation. In October 1991, BWXT eliminated the radiological contamination source to the PA filter cake solids

. Prior to June 1990, the PA filter cake was managed as a non-hazardous solid waste. The management of the PA filter cake included its disposal in unlined on-site landfill s permitted to receive industrial waste. These landfills are designated as Landfill 1 and 2.

Immediately upon determining that the PA filte r cake was radiologically contaminated, BWXT informed EPA Region 3 of the finding and suspende d the development of a closure plan for the emergency surface impoundment. BWXT’s action re sulted in an investigation by the EPA and DEQ. In November 1990, the VDWM classifi ed the PA filter cake as an F006 waste.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 5 The F006 waste classification is defined as wa stewater treatment sludge from electroplating operations. The PA system treats wastewater from metal finishing operations, which consist of cleaning, hydrofluoric and nitr ic acid pickling, and anodizing operations. The F006 waste is listed for the following hazardous constituents: ca dmium, hexavalent chromium, nickel, and complex cyanide (Title 40 Code of Federal Regulations, Part 261, A ppendix VIII). BWXT asserted that the F006 listing should not apply to a zirconium alloy base d processing operation, but was ultimately unsuccessful in convincing th e VDWM or EPA Region 3. Past chemical analysis of the filter cake demonstrates that it does not exhibit the traditional F006 listing characteristics (3).

The F006 classification of the PA filter cake is based solely on a process definition. The listing meant that the sludge in the FEPs (as well as the filter cake in the la ndfills) was also a F006 waste because suspended solids from the process had been discharged at various times to both ponds. The F006 listing and the presence of uran ium in the waste rendered the FEP sludge a mixed waste. As a mixed waste, both the EPA and the NRC regulated the materials. In the event that BWXT is successful in delisting th e sludge under RCRA, the sl udge will continue to be managed as a LLR waste under stringent NRC regulations. BWXT is obligated under its

NRC license to decommission the site at the end of its operating life. The FEP will be

decommissioned in accordance with NRC release criteria.

On September 30, 1994, BWXT petitioned EPA to exclude from the lists of hazardous waste identified at 40 CFR 261.31, both past and curr ently generated filter cake solids produced by its wastewater treatment facility from the treatm ent of wastewaters in the PA system. BWXT believed that the petitioned waste did not meet any of the criteria under which the waste was listed, and that there were no additional constituents or factors that would cause the waste to be

hazardous.

In an August 4, 1999 proposed rule (Title 64 Fe deral Rule [FR] 42317), EPA proposed to delist the currently generated filter cake, but declined to consider the exclusion of the past generated filter cake for administrative reasons. As previ ously discussed, the past generated filter cake solids (prior to October 1991) are classified as a mixed waste. At the time of the proposed rule, the Commonwealth of Virginia had been granted the authorization to administer the RCRA base program by EPA, but was not specifically author ized for mixed waste. In a state that was authorized for the RCRA base program, but not specifically authorized for mixed waste, the waste was not subject to the Federal hazardous waste requirements until the state receives authorization specifically for mixed waste.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 6 On January 14, 2000, EPA issued a final rule (65 FR 2337) excluding th e currently generated

filter cake from hazardous waste control. The Co mmonwealth of Virginia adopted the delisting on May 1, 2000. The PA filter cake is now disposed of off-site as a non-hazardous waste in an

industrial waste landfill.

The DEQ received authorization from EPA on Ju ly 31, 2000 to regulate the management of mixed waste within Commonwealth of Virginia. This final authorization became effective on September 29, 2000.



# 4.0 Use of Groundwater Monitoring Data in Delisting Petitions

In an October 12, 1989 proposed rule, EPA indi cated that it would consider groundwatermonitoring data in the evaluation of delisting pe titions. The proposed ru le stated that the petitioner must submit groundwater information nece ssary to characterize the petitioned waste’s impact on groundwater quality, including the an alyses of groundwater for any constituent deemed necessary by EPA. The Hazardous and Solid Waste Amendments Act (HSWA) of 1984 require EPA to consider any factors (includi ng additional constituents) other than those for which the waste was listed, if there is a reasonable basis to believe that such additional factors

could cause the waste to be hazardous. A lthough the October 1989 proposed rule was later withdrawn, it still referenced in EPA guidance on delisting petitions.

EPA uses the groundwater data to complement th e use of groundwater and contaminant transport models to predict the mobility of toxicants from land-disposed wastes. Groundwater monitoring data that show no unacceptable toxicant levels may support EPA’s decision to grant a waste exclusion. Conversely, groundwater monitoring da ta that show evidence of contamination may support EPA’s decision to deny a petition. In evaluating a delisting petition, EPA will consider to be unacceptable groundwater contamination that exceeds health-based levels (HBL) in wells that monitor the units containing the petitioned waste. The HBLs are compiled from maximum contaminant levels (MCL) and EPA Region 3 risk-based concentrations (RBC) for carcinogens and noncarcinogens. Groundwater contamination above HBLs may provide grounds to deny a petition unless the peti tioner can demonstrate one of the following:

• The petitioned waste has not contributed to the contamination (e.g., contamination is the result of other on-site sources)

• The exceedance is due to an error in samp ling or analysis or other factors not associated with the petitioned wasteKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 7 • The exceedance, although greater than the he alth-based levels, is not statistically significant.

The following section discusses the relevant grou ndwater data that demonstrates that the FEP sludge has not contributed to groundwater contamin ation at the site, and that the groundwater contamination that exists downgradient of th e FEPs is caused by another on-site source.



# 5.0 Relevant Groundwater Monitoring Data

Groundwater has been sampled over 5 quarters (star ting in February 2001) at Landfill 1 and the FEP to support the delisting of past-generated PA filter cake and carry- over suspended solids at the Mt. Athos Site. Although PA filter cake was also disposed on-site at Landfill 2, recent groundwater data has not been collect ed at this unit because the delis ting of this waste material in this unit is not being pursued.

BWXT discontinued the disposal of PA filter cake in Landfill 1 in 1976. Landfill 1 is closed and is not an issue under the hazardous waste regulati ons. However, the NRC has requested that a portion of the waste material that contains higher levels of radioactivity in Landfill 1 be removed as a part of the Agency’s timeliness and deco mmissioning policy. Landfill 2, which ceased operations in 1990, is subject to hazardous wast e regulations. The NRC has released Landfill 2 and requested that it be capped to meet decomm issioning closure criteria. BWXT is proceeding

with the RCRA closure of Landfill 2.

As discussed in Section 2.0, the FEP sludge is ma de up in part of the TS S carryover of the filter cake solids that have also been placed in La ndfills 1 and 2. Additionally, the FEP sludge is composed of non-hazardous suspended solids carry-over from the LLR, water production, and grit blasting wastewater treatment systems. Th e LLR wastewater treatment process is almost identical to that used in the PA system, in th at the equipment configur ations are substantially similar. The LLR system treats spent acid solu tions from radiological operating areas of the facility.

The FEP sludge contains solids generated from the PA wastewater tr eatment process over a longer period of time than either landfill, although the period of accumulation in the ponds encompasses the time period over which the PA filter cake was disposed of in both landfills. As such, the current groundwater monitoring data fo r both the FEPs and Landfill 1 are pertinent to the delisting evaluation (as previously discussed, there is no recent groun dwater data availableKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 8 for Landfill 2). For the reasons stated below, the groundwater data from Landfill 1 is more representative of the actual mobility of some the constituents (principally fluoride) in the PA suspended solids.

The use of FEP groundwater data to evaluate co ntaminant mobility in the FEP sludge and its impact on downgradient groundwater is complicated by the effects of the wa stewater effluent in the FEP. As previously discussed, the FEPs ar e used as equalization ponds for treated industrial effluent and are part of BWXT’s permitted wastewater treatment system that discharges to the James River. The fluoride in the sludge is present as calcium fluoride an insoluble precipitate,

while the fluoride in the effluent is in a di ssolved form that can mi grate through the soil and affect the underlying groundwater. As a re sult, BWXT believes that the FEP groundwater monitoring data is not relevant to the evaluation of some of the cons tituents (those also present in the effluent) in the FEP sludge for delisting.

The groundwater monitoring data at Landfill 1 is mo re representative of the impact of certain constituents in the PA sludge (e.g., fluoride) on groundwater because it is not co-located with the

dissolved form of these constituents in wastewat er. The remainder of this section presents the groundwater monitoring data for the FEP and Landfill 1. Throughout this discussion, a distinction will be made between groundwater ex ceedances attributable to the FEP and those attributable to the FEP sludge.

5.1 FEP Groundwater Data Tables 5-1 through 5-4 present the available qua rterly groundwater monitoring data for FEP monitoring wells FEP-3, FEP-2, FEP-1, and MW A-17, respectively. As shown on Figure 5-1, FEP-3 is a background well, located upgradient of the ponds. Wells FEP-1 and FEP-2 are located immediately downgrad ient of the ponds, while well MWA-17 is located further downgradient between the ponds and the James Rive r. On each table, the groundwater results are compared to MCLs and EPA Region 3 RBCs for ta p water. Chemical detections that exceed

either the MCL or the RBC are shaded on the tabl es. It has been EPA’s past practice when assigning “delisting levels” to select the MCL when one is available.

Tables 5-1 through 5-4 show the temporal variab ility of the groundwater data within each FEP monitoring well. An examination of these tabl es shows that several chemicals are detected

above either the MCL or the RBC in one or more we lls. Most of the constituents of interest on

the tables with elevated concentrations are metals. The other constituents of interest are the chlorinated solvents tetrachloroethene (PCE) and trichloroethene (TCE).KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 9 In order to properly evaluate the data for delisting purposes, it is necessary to compare upgradient and downgradient concentrations from each sampling event to determine if the FEPs

are the source of the elevated concentrations with respect to HBLs. An upgradient (background) concentration of a particular chemical at or a bove the level detected in downgradient wells is

direct evidence that the FEPs are not contributin g to downgradient groundwater contamination. A comparison of data in this form (Tables 5-5 through 5-9) shows that the FEP are not contributing to most of the elevated concentrations of chemicals detected in downgradient wells. Of the several inorganic constituents that are elevated above HBLs in downgradient groundwater, only fluoride cannot be attributed to a source upgradient of the FEP.

The concentrations of chlorinated solvents de tected downgradient of the FEPs are directly attributable to the Area A groundw ater plume at the Mt. Athos Site. Previous studies have documented the extent of this solvent plume (4). During the recent quarterly monitoring events, TCE was consistently detected in up-gradient mo nitoring well FEP-3. In addition, there is no process information, effluent data, sludge data, or filter cake analytical da ta that would implicate the FEPs as the source of these solvents. BWXT has a limitation-monitoring waiver on its current VPDES permit for total toxic organics (including chlorinated vol atile organic compounds [VOC]) because these constituents were not detect ed in past effluent sampling. Based on an evaluation of the available data, it is clear that these chemicals are unrelated to the FEPs or the FEP sludge.

The facility wastewaters are th e source of the fluoride in downgr adient groundwater. There is evidence that the FEP sludge is not the source of this contamination. The concentrations of

dissolved fluoride in the treate d industrial effluent flowing through the FEPs are well within levels that could generate the groundwater concen trations detected downg radient of the FEPs. The fluoride concentration in downgradient gr oundwater in 2001 ranged from 11,000 to 18,100 micrograms per liter (μg/L), with an average concentration of 13,500 μg/L. Dissolved fluoride concentrations in the treated effluent (Figur e 5-2) over the time period 1996 to 2002 range from 2600 μg/L to 85,000 μg/L, with an average concen tration over this pe riod of 13,000 μg/L. Although the industrial wastewater is treated to reduce the concen tration of fluoride, significant levels of fluoride are still present in the FEP-2 outfall before the water is combined with other treated water streams and discharged to the James Ri ver. This data demonstrates that the treated industrial effluent that discharges through FEP-2 is the source of the downgradient groundwater

contamination. Because the fluoride concentrations in groundwater can be attributed to a source other than the FEP sludge, BWXT believes that the fluoride groundwater data is not an appropriate parameter for assessing the potential impact of the FEP sludge on groundwater.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 10 Additional evidence demonstrating the link between chemicals detected in the FEP effluent and groundwater downgradient of the FEPs can be f ound in groundwater monitoring data collected by BWXT in 1994. In June 1994, BWXT determined that the FEPs were impacting the concentrations of nitrate, nitrite, fluoride, sodium, and foaming agents in downgradient groundwater. Although composition data for these cons tituents in PA filter cake or FEP sludge are not available (with the exception of fluoride in filter cake), it is know n that the common salts of sodium, nitrate, and nitrite are highly water- soluble. Therefore, these constituents would not be expected to be present to a ny significant degree in the susp ended solids carry-over into the FEP. Based on the solubility of these ions, it is likely that the concentrations of these constituents in groundwater downgradient of the FE Ps result from the dissolved levels of these ions in the FEP effluent. More specifically, the concentrations of dissolved fluoride in the FEP effluent have impacted downgradient groundwater.

5.2 Landfill 1 Groundwater Data As previously discussed, PA filter cake was dispos ed of on-site at Landfill 1. Therefore, current groundwater monitoring data from th e landfill is relevant to the FE P sludge delisting evaluation. As shown on Figure 5-3, four monitoring wells encircle Landfill 1. Well LF-4 is upgradient of the landfill trenches, wells FL-1 and FL-3 ar e crossgradient, and well FL-2 is directly downgradient of the landfill. Tables 5-10 through 5-14 present groundwater monitoring data from five quarterly sampling events at Landfill 1, beginning in February 2001.

The tables show that several metals and chlorinated solvents were detected in one or more wells at concentrations greater than HBLs. However, of the six metals detected above HBLs during at least one sampling event (arsenic, beryllium, cadmium, chromium, lead, and thallium), none of the metals were consistently detected in downgradient groundwater at concentrations that were above the upgradient groundwater concentrations . Therefore, the PA filter cake in the landfill trenches is not contributing to downgradient gr oundwater contamination of inorganic chemicals above HBLs. In particular, the concentrations of fluoride in all Landf ill 1 groundwater samples are well below HBLs. Given the chemical similarity of the PA filter cake and the FEP sludge, this is further evidence supporting BWXT’s conclu sion that the FEP sludge is not the source of the fluoride contamination in gr oundwater downgradient of the FEPs

.

Four chlorinated solvents, PCE, TCE, cis-1,2-di chloroethene (DCE), and vinyl chloride (VC), were detected above HBLs in groundwater monito ring data. Although solven t concentrations in downgradient wells were higher than those in th e upgradient well, extensive sampling of soil, waste (PA filter cake), and groundwater at Landf ill 1 has not demonstrated that the solvent

contamination at the site is attributable to th e PA filter cake placed in the trenches. SignificantKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 11 concentrations of VOCs have not been detected in the filter cake samples collected from the landfill trenches (5). The very low concentrations of VOCs that were detected in some filter cake samples appear to be due to contaminated groundwater from a source outside the trenches contacting the filter cake due to seasonal fluctuations in groundwater levels. Additionally, VOCs have not been detected in the current generation of PA filter cake for off-site disposal.

A review of all the groundwater data collect ed at Landfill 1, including the samples from temporary wells constructed around the landfill trenches, clearly s hows that the VOC “hot spot” in groundwater is located southeast of the landfill trenches (plant grid east) near monitoring well FL-3. VOC concentrations drop off significantly in all directions away from this location (6).

The totality of the analytical data collected for all media at Landfill 1 strongly indicates that the solvent contamination detected in groundwater at the landfill originates from a source other than

the landfill trenches. Because the VOC concentr ations in groundwater can be attributed to a source other than the PA filter cake placed in th e landfill, the VOC groundw ater data is not an appropriate parameter for assessing the potential impact of the PA filter cake (or FEP sludge) on groundwater.



# 6.0 FEP Risk Assessment

The FEPs are part of BWXT’s DES-permitted wast ewater treatment system. Under the previous VPDES permit, BWXT was required to monitor and address any exceedances of groundwater

standards associated with the FEPs. BWXT inst alled and monitored wells adjacent to the FEPs and identified and investigated the impact of groundwater exceedances.

BWXT issued several reports to the Water Divi sion of DEQ (7, 8) rela ted to the groundwater

exceedances associated with the FEPs. The resu lts of the risk assessm ent screening indicated that groundwater impacted by the FEPs does not pos e a significant risk to human health and the environment for those constituents of interest (COI) examined. This conclusion was based on comparisons of the groundwater data to conserva tive effects benchmarks (federal aquatic water quality criteria) and upstream reference background data.

The environmental risk assessment included an ev aluation of toxicity, point of exposure, and receptors. All three components must be present to constitute a risk. The James River is the only exposure point where receptors could be potentially exposed to impacted groundwater, resulting in a potential risk. The conservative risk assessment confirmed that the James River surface water was not impacted by the groundwater . The report concluded that correctiveKN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 12 measures to address the groundwater exceedances were not warranted, thus no further actions were recommended. The DEQ concurred with that recommendation (9).



# 7.0 Conclusions

The following conclusions can be drawn from a re view of the groundwater monitoring data for

the FEPs and Landfill 1:

• The FEP sludge is not cont ributing to groundwater c ontamination above HBLs downgradient of the FEPs for the following reasons:

− A comparison of upgradient and downgrad ient monitoring well data shows that the FEPs are not contributing to groundwater contamination.

− Fluoride in groundwater at concentra tions above HBLs dow ngradient of the FEPs is attributable to dissolved fluoride present in the treated effluent (not the sludge) that discharges through FEP-2. Fluoride concentrations in the FEP effluent are within the range of con centrations detected in downgradient groundwater. Previously, BWXT had established a similar connection between dissolved concentrations of sodium , nitrate, and nitrite in FEP effluent and elevated concentrations of these c onstituents in groundwater. Therefore, BWXT believes that the fluoride gro undwater data at the FEPs is not appropriate for evaluating the delisting of FEP sludge because the contamination is the result of dissolved constituents present in the effluent (another on-site source).

− PCE and TCE in groundwater at concentra tions above HBLs are attributable to the Area A groundwater plume at the Mt. Athos Site, which has migrated into the area occupied by the FEPs. Therefore, PCE and TCE (and their degradation products) groundwater data at the FEPs are not appropriate for evaluating the delisting of FEP sludge because the contamination is the result of another on-site source.

Therefore, the solid materials deposited in the FEPs do not contribute to the groundwater exceedances; and BWXT believes that the fluoride, PCE, and TCE data are not relevant to the delisting evaluation based on the exemption discussed in Section 4.0.

• Groundwater monitoring data for Landfill 1 shows that PA filter cake (similar in composition to FEP sludge) does not contri bute to fluoride concentrations in groundwater above HBLs at the landfill. This data is corroborating evidence that the fluoride concentrations detected above HBLs in groundwater at the FEPs do not originate from the FEP sludge.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 13 • BWXT completed a conservative risk asse ssment associated with the groundwater exceedances that have been detected downgradient of the FEPs. The risk assessment confirmed the lack of complete exposure pathways, cited the dilution provided by the river, and the lack of hu man health or ecological receptors (now and in the future) to support the conclusion that the groundwater exceedances are not a significant problem and do not warrant any corrective action.

• Any actions BWXT undertakes associated with the FEPs or the FEP sludge must be done in conjunction its NRC license and its VDPES discharge permit. Furthermore, BWXT is obligated to decommission the FEPs at the end of their operating life to NRC release criteria. Gi ven the current regulatory status of the sludge, it would be managed as a mixed wa ste. In the event the FEP sludge is excluded from management under RCRA, the sludge would still be managed as a LLR waste and disposed of at a licensed LLR waste disposal facility. Disposal of the FEP sludge in an NRC-approved LLR waste landfill would meet or exceed the minimum standards for disposal of the PA filter cake that EPA established in the PA filter cake delisting (65 FR 2337).



# 8.0 Recommendations

Based on the groundwater data presented in Section 5.0, there is no direct evidence that the FEP sludge is contributing to groundwater contamination above HBLs downgradient of the FEPs. Because the fluoride, PCE, and TCE concentrations in groundwater can be attributed to sources other than the FEP sludge, BWXT believes that th e groundwater data for these constituents are not appropriate parameters to assess the potential impact of the FEP sludge on groundwater. The groundwater data for all other ch emical constituents should suppor t an EPA decision to grant a waste exclusion for the FEP sludge.

It is recommended that the deli sting process proceed, including the sampling and analysis of FEP sludge and PA treatment system TSS carryover for characterization of the appropriate analytical parameters. The characterization data can be used with the appropriate fate and transport model, such as the EPA Composite Model for Leachi ng Migration with Transformation Products, to

calculate a cumulative cancer risk and non-cance r hazard for the FEP sludge and determine appropriate “delisting levels” for the future susp ended solids discharging to the FEPs from the PA treatment process. BWXT welcomes the oppor tunity to work jointly with EPA Region 3 to devise a sampling and analytical program to support the F006 delisting process. A positive outcome using this risk-based delisting procedur e should confirm the results of the groundwater evaluation presented here, and resolve any questi on about the potential impact of the FEP sludge on groundwater.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

## 14 

# 9.0 References

(1) Virginia Department of Waste Management, Letter to Babcock and Wilcox, December 27, 1990.

(2) BWX Technologies, Inc. (BWXT), 2002a, Draf t Final Effluent Ponds 1 and 2 Delisting Petition (Process Description section), March 2002.

(3) BWX Technologies, Inc. (BWXT), 1994b, FEP Sludge Delisting Petition, ID No. 0889, October 1994.

(4) BWX Technologies, Inc. (BWXT), 2002b, Draft RCRA Corrective Measure Study, Comprehensive Baseline Monitoring Report, Mt. Athos Site, Lynchburg, Virginia, February 2002.

(5) BWX Technologies, Inc. (BWXT), 2001, Supplemental Assessment Report, LF-1 (Former Landfill), Mt. Athos Site, Lynchburg, Virginia, December 2001.

(6) BWX Technologies, Inc. (BWXT), 2002c, Gr oundwater Assessment at Landfill 1 (LF-1: Former Landfill), Mt. Athos Site, Lynchburg, Virginia, March 2002.

(7) BWX Technologies, Inc. (BWXT), Assessmen t of Potential Environmental Risk Associated with Groundwater Impacted by the Final Effluent Ponds, August 1994.

(8) BWX Technologies, Inc. (BWXT), Corrective Ac tion Plan for Exceedances from the Final Effluent Ponds, March 1998.

(9) Virginia Department of Environmental Quality (DEQ), Letters to BWX Technologies, Inc., Addressing Final Effluent Ponds Risk A ssessment, May 13, 1998 and August 3, 1998.KN6\BWXT\FEP\02 GWAR\GWAR rev 10.doc\5/23/06\4:09 PM 

# TABLESKN6\BWXT\FEP\02 GWAR\Table 3-1.doc\5/23/06\4:14 PMTable 3-1Operating History of the Final Effluent PondsBWX Technologies, Inc.Mt. Athos Site, Lynchburg, VirginiaPond No. Time Interval Wastewater StreamFEP-1 1973-1979 All (Low-Level Radioactive, Pickle Acid, Sanitary, Miscellaneous)1980-1992 Pickle Acid, Sanitary, and Water Production1993-Present Water Production and Once Through Non-Contact Cooling WaterFEP-2 1979 All (Low Level Radioactive,Pickle Acid, Sanitary, Miscellaneous)1980-1992 Low-Level Radioactive1992-Present Low-Level Radioactive, Pickle Acid, and Grit Blast

### Table 5-1

Final Effluent Pond Groundwater Monitoring Data Well FEP-3 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-3 FEP-3 FEP-3DUP FEP-3 FEP-3 FEP-3

Date Sampled 02/14/01 05/16/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 400 300 300 200 200 400 Sulfide N/A N/A 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 972* < 38.9* < 38.9* < 38.9* < 58.7* < 58.7* Arsenic 50 0.045 1180 42.8 28.7 < 18.9* < 27.7* < 27.7* Barium 2000 2600 1170 882 840 370 236 221 Beryllium 4 73 < 10.8* 5.22 5 1.67 0.889 < 0.233 Cadmium 5 18 < 55.6* < 2.22 < 2.22 < 2.22 < 3.78 < 3.78 Chromium 100 110 322 109 109 36.3 16.4 9.67 Cobalt N/A 730 < 83.3 74.8 70.6 17.7 8.33 3.56 Copper 1300 1500 150 226 215 49.3 19.6 7.22 Lead 15 N/A < 1060* 154 132 < 42.2* < 54.3* < 54.3* Mercury 2 3.7 < 0.1 0.321 0.362 < 0.1 < 0.2 < 0.2 Nickel N/A 730 < 111 125 124 35.3 13.3 < 11.3 Selenium 50 180 633 25.2 < 24.4 < 24.4 < 28.6 < 28.6 Silver N/A 180 < 194* < 7.78 < 7.78 < 7.78 < 9 < 9 Thallium 2 2.6 < 2030* < 81.1* < 81.1* 135 < 67.7* < 67.7* Tin N/A 22000 < 1000 < 40 < 40 < 40 < 40 < 12.2 Vanadium N/A 260 139 222 215 81.3 28 9.33 Zinc N/A 11000 422 415 416 105 71.8 37.6 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 2* < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10.2 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10.2 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10.2 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10.2 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10.2 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10.2* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10.2* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10.2 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10.2 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10.2* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10.2 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10.2 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10.2 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10.2 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10.2 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10.2 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-1 (FEP-3).xls(fep3q102gwcdh)\5/23/2006(4:36 PM)

### Table 5-1

Final Effluent Pond Groundwater Monitoring Data Well FEP-3 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-3 FEP-3 FEP-3DUP FEP-3 FEP-3 FEP-3

Date Sampled 02/14/01 05/16/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10.2 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10.2 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10.2 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10.2* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10.2* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10.2 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10.2 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10.2 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10.2 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10.2 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10.2* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10.2 < 10 Acenaphthylene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10.2* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10.2 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10.2* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10.2 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10.2* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10.2* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10.2* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10.2* < 10* Benzo(ghi)perylene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10.2* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10.2 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10.2 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10.2 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10.2* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10.2* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10.2* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10.2 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10.2 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10.2* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10.2 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10.2 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10.2 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10.2* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10.2 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-1 (FEP-3).xls(fep3q102gwcdh)\5/23/2006(4:36 PM)

### Table 5-1

Final Effluent Pond Groundwater Monitoring Data Well FEP-3 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-3 FEP-3 FEP-3DUP FEP-3 FEP-3 FEP-3

Date Sampled 02/14/01 05/16/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10.2 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10.2 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10.2* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10.2* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10.2 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10.2* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10.2* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10.2 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10.2* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10.2* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10.2* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10.2* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10.2* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10.2* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10.2* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10.2 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10.2* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10.2* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Phenanthrene N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10.2 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10.2 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10.2 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10.2 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10.2* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10.2* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 4.2 1.5 1.3 < 10* 3.6 1.7 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10.2* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10.2* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10.2 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-1 (FEP-3).xls(fep3q102gwcdh)\5/23/2006(4:36 PM)

### Table 5-1

Final Effluent Pond Groundwater Monitoring Data Well FEP-3 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-3 FEP-3 FEP-3DUP FEP-3 FEP-3 FEP-3

Date Sampled 02/14/01 05/16/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-1 (FEP-3).xls(fep3q102gwcdh)\5/23/2006(4:36 PM)

### Table 5-1

Final Effluent Pond Groundwater Monitoring Data Well FEP-3 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-3 FEP-3 FEP-3DUP FEP-3 FEP-3 FEP-3

Date Sampled 02/14/01 05/16/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 < 10* < 10* < 10* < 10* < 10* < 10* Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 4.3 6 6.2 6.1 5 2.4 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 < 10 < 10 < 10 < 10 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-1 (FEP-3).xls(fep3q102gwcdh)\5/23/2006(4:36 PM)

### Table 5-2

Final Effluent Pond Groundwater Monitoring Data Well FEP-2 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-2 FEP-2 FEP-2 FEP-2 FEP-2

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 8 < 5 < 5 < 5 Fluoride, Total 4000 2200 18100 11900 11000 13000 8370 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 58.7* < 58.7* Arsenic 50 0.045 < 18.9* < 18.9* < 18.9* < 27.7* < 27.7* Barium 2000 2600 305 684 338 339 342 Beryllium 4 73 1.78 2.89 0.667 1.33 0.778 Cadmium 5 18 2.89 2.89 < 2.22 < 3.78 < 3.78 Chromium 100 110 26.6 51.6 < 8.89 25.1 16.4 Cobalt N/A 730 26 31.3 8.67 17.7 9.22 Copper 1300 1500 29.7 37.7 21.6 21.2 10.3 Lead 15 N/A < 42.2* 74.9 < 42.2* < 54.3* < 54.3* Mercury 2 3.7 < 0.1 < 0.1 < 0.1 < 0.2 < 0.2 Nickel N/A 730 48.3 73.2 30.2 42.6 33.8 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 28.6 < 28.6 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 9 < 9 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* < 67.7* < 67.7* Tin N/A 22000 < 40 < 40 < 40 < 40 < 12.2 Vanadium N/A 260 38.2 84.7 13 31.3 19.4 Zinc N/A 11000 106 196 27 72.7 41.6 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 2* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10.3 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10.3 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10.3 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10.3 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10.3 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10.3 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10.3* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10.3* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10.3 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10.3 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10.3 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10.3 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10.3 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10.3* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10.3 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10.3 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10.3 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10.3 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10.3 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10.3 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10.3 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10.3 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-2 (FEP-2).xls(fep2q102gwcdh)\5/23/2006(4:16 PM)

### Table 5-2

Final Effluent Pond Groundwater Monitoring Data Well FEP-2 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-2 FEP-2 FEP-2 FEP-2 FEP-2

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10.3 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10.3 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10.3 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10.3 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10.3 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10.3 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10.3* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10.3* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10.3 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10.3 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10.3 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10.3 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10.3 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10.3 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10.3 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10.3 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10.3 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10.3 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10.3 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10.3 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10.3 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10.3* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10.3 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10.3 < 10 Acenaphthylene N/A N/A < 10 < 10 < 10 < 10.3 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10.3* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10.3 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10.3* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10.3 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10.3* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10.3* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10.3* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10.3* < 10* Benzo(ghi)perylene N/A N/A < 10 < 10 < 10 < 10.3 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10.3* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10.3 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10.3 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10.3 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10.3* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10.3* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10.3* < 10* Di-n-butyl phthalate N/A 3700 1.3 < 10 < 10 < 10.3 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10.3 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10.3* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10.3 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10.3 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10.3 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10.3* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10.3 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-2 (FEP-2).xls(fep2q102gwcdh)\5/23/2006(4:16 PM)

### Table 5-2

Final Effluent Pond Groundwater Monitoring Data Well FEP-2 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-2 FEP-2 FEP-2 FEP-2 FEP-2

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10.3 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10.3 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10.3 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10.3* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10.3* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10.3 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10.3* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10.3 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10.3* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10.3 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10.3 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10.3 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10.3 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10.3* < 10* N-Nitrosodiethylamine N/A 0.00045 2.4 < 10* < 10* < 10.3* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10.3* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10.3* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10.3 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10.3 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10.3* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10.3* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10.3* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10.3 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10.3 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10.3* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10.3* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10.3 < 10 Phenanthrene N/A N/A < 10 < 10 < 10 < 10.3 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10.3 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10.3 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10.3 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10.3 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10.3 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10.3 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10.3 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10.3* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10.3* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* 2.3 < 10* 4.3 4.8 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10.3* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10.3* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10.3 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-2 (FEP-2).xls(fep2q102gwcdh)\5/23/2006(4:16 PM)

### Table 5-2

Final Effluent Pond Groundwater Monitoring Data Well FEP-2 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-2 FEP-2 FEP-2 FEP-2 FEP-2

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-2 (FEP-2).xls(fep2q102gwcdh)\5/23/2006(4:16 PM)

### Table 5-2

Final Effluent Pond Groundwater Monitoring Data Well FEP-2 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-2 FEP-2 FEP-2 FEP-2 FEP-2

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 21 22.2 15 13.1 9.6 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 156 116 103 254 30.1 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 8.5 4.3 7 1.1 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-2 (FEP-2).xls(fep2q102gwcdh)\5/23/2006(4:16 PM)Table 5-3

Final Effluent Pond Groundwater Monitoring Data Well FEP-1 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 4)

Sample Number FEP-1 FEP-1 FEP-1 FEP-1DUP FEP-1DUP FEP-1 FEP-1 FEP-1

Date Sampled 02/14/01 05/16/01 08/22/01 08/22/01 11/12/01 11/12/01 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 12 < 5 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 3200 2700 3200 3200 4000 3800 2410 2320 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 38.9* < 58.7* < 58.7* < 58.7* < 58.7* Arsenic 50 0.045 < 18.9* < 18.9* < 18.9* < 18.9* < 27.7* < 27.7* < 27.7* < 27.7* Barium 2000 2600 1580 296 293 231 181 224 150 143 Beryllium 4 73 0.778 1.67 1.11 0.667 0.889 1.33 0.333 0.333 Cadmium 5 18 < 2.22 2.22 < 2.22 < 2.22 < 3.78 < 3.78 < 3.78 < 3.78 Chromium 100 110 17.7 46.3 31.2 20.2 25.9 34.1 12.9 13.9 Cobalt N/A 730 88.8 221 106 60 81.8 86.3 36.2 35.9 Copper 1300 1500 23.6 43.8 29.2 37 23.4 35.7 13.1 15.8 Lead 15 N/A < 42.2* 64.2 < 42.2* < 42.2* < 54.3* < 54.3* < 54.3* < 54.3* Mercury 2 3.7 < 0.1 0.109 < 0.1 < 0.1 1.12 < 0.2 < 0.2 < 0.2 Nickel N/A 730 60.7 96.4 72.4 70.6 70.1 75.6 42.6 43.6 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 24.4 < 28.6 < 28.6 < 28.6 < 28.6 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 7.78 < 9 < 9 < 9 < 9 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* < 81.1* < 67.7* < 67.7* < 67.7* < 67.7* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 < 40 < 12.2 < 12.2 Vanadium N/A 260 22.2 55 50.6 29 29.8 40.8 13.9 10.4 Zinc N/A 11000 78.3 158 87.1 62.1 98.2 111 37.2 35.4 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 2* < 1* < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Groundwater

KN6\BWXT\FEP\02 GWAR\Table 5-3 (FEP-1).xls(fep1q102gwcdh)\5/23/2006(4:16 PM)Table 5-3

Final Effluent Pond Groundwater Monitoring Data Well FEP-1 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 4)

Sample Number FEP-1 FEP-1 FEP-1 FEP-1DUP FEP-1DUP FEP-1 FEP-1 FEP-1

Date Sampled 02/14/01 05/16/01 08/22/01 08/22/01 11/12/01 11/12/01 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L Groundwater

4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Acenaphthylene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Benzo(ghi)perylene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 1.3 3.2 < 10 < 10 < 10.1 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A 2.6 1.5 < 10 < 10 < 10.1 < 10 1.1 1.2 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10*

KN6\BWXT\FEP\02 GWAR\Table 5-3 (FEP-1).xls(fep1q102gwcdh)\5/23/2006(4:16 PM)Table 5-3

Final Effluent Pond Groundwater Monitoring Data Well FEP-1 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 4)

Sample Number FEP-1 FEP-1 FEP-1 FEP-1DUP FEP-1DUP FEP-1 FEP-1 FEP-1

Date Sampled 02/14/01 05/16/01 08/22/01 08/22/01 11/12/01 11/12/01 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L Groundwater

Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Phenanthrene N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* 4.7 4.4 < 10* 2 1.9 < 10* 1.4 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10.1* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10.1 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 < 10 1.6 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-3 (FEP-1).xls(fep1q102gwcdh)\5/23/2006(4:16 PM)Table 5-3

Final Effluent Pond Groundwater Monitoring Data Well FEP-1 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 4)

Sample Number FEP-1 FEP-1 FEP-1 FEP-1DUP FEP-1DUP FEP-1 FEP-1 FEP-1

Date Sampled 02/14/01 05/16/01 08/22/01 08/22/01 11/12/01 11/12/01 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L μg/L Groundwater

Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100* < 100* < 100* < 100* Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 1.6 1.2 1.4 1.4 1.9 2 1.4 1.4 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 9.4 8.4 8.6 8.5 38.4 38.1 8.3 8.2 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 3.2 2.6 2.6 3.2 3.2 2.2 2.2 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/ A 0.0013 < 10* < 10* < 10* < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-3 (FEP-1).xls(fep1q102gwcdh)\5/23/2006(4:16 PM)

### Table 5-4

Final Effluent Groundwater Monitoring Data Well MWA-17 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number MWA-17 MWA-17 MWA-17 MWA-17 MWA-17

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 6 < 5 < 5 < 5 Fluoride, Total 4000 2200 2200 2400 1900 2600 1910 Sulfide N/A N/A 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 58.7* < 58.7* Arsenic 50 0.045 < 18.9* < 18.9* < 18.9* < 27.7* < 27.7* Barium 2000 2600 381 1860 461 515 154 Beryllium 4 73 < 0.433 1.78 < 0.444 0.667 < 0.233 Cadmium 5 18 < 2.22 4.22 < 2.22 < 3.78 < 3.78 Chromium 100 110 < 8.89 51.7 < 8.89 13.1 < 8.89 Cobalt N/A 730 4.44 56.9 6.89 19 < 3.33 Copper 1300 1500 6.44 157 30.6 24.6 9 Lead 15 N/A < 42.2* 118 < 42.2* < 54.3* < 54.3* Mercury 2 3.7 < 0.1 < 0.1 < 0.1 < 0.2 Nickel N/A 730 8.67 96.8 12.3 36 < 11.3 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 28.6 < 28.6 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 9 < 9 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* < 67.7* < 67.7* Tin N/A 22000 < 40 < 40 < 40 < 40 < 12.2 Vanadium N/A 260 < 2.22 64 4.89 15.8 < 4.78 Zinc N/A 11000 22.7 327 38.9 129 17.9 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 2* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-4 (MWA-17).xls(mwa17q102gwcdh)\5/23/2006(4:17 PM)

### Table 5-4

Final Effluent Groundwater Monitoring Data Well MWA-17 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number MWA-17 MWA-17 MWA-17 MWA-17 MWA-17

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A N/A < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A N/A < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-4 (MWA-17).xls(mwa17q102gwcdh)\5/23/2006(4:17 PM)

### Table 5-4

Final Effluent Groundwater Monitoring Data Well MWA-17 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number MWA-17 MWA-17 MWA-17 MWA-17 MWA-17

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* 1.4 3 4.5 1.6 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-4 (MWA-17).xls(mwa17q102gwcdh)\5/23/2006(4:17 PM)

### Table 5-4

Final Effluent Groundwater Monitoring Data Well MWA-17 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number MWA-17 MWA-17 MWA-17 MWA-17 MWA-17

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-4 (MWA-17).xls(mwa17q102gwcdh)\5/23/2006(4:17 PM)

### Table 5-4

Final Effluent Groundwater Monitoring Data Well MWA-17 BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number MWA-17 MWA-17 MWA-17 MWA-17 MWA-17

Date Sampled 02/14/01 05/16/01 08/22/01 11/12/01 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 29.9 19.5 1.4 46.5 1.3 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 174 135 11.9 214 10.2 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 17 < 10 24.4 1.2 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-4 (MWA-17).xls(mwa17q102gwcdh)\5/23/2006(4:17 PM)

### Table 5-5

Final Effluent Pond Groundwater Monitoring Data Feburary 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/01 02/14/01 02/14/01 02/14/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 3200 18100 400 2200 Sulfide N/A N/A < 1000 < 1000 1000 1000 Antimony 6 15 < 38.9* < 38.9* < 972* < 38.9* Arsenic 50 0.045 < 18.9* < 18.9* 1180 < 18.9* Barium 2000 2600 1580 305 1170 381 Beryllium 4 73 0.778 1.78 < 10.8* < 0.433 Cadmium 5 18 < 2.22* 2.89 < 55.6* < 2.22* Chromium 100 110 17.7 26.6 322 < 8.89 Cobalt N/A 730 88.8 26 < 83.3 4.44 Copper 1300 1500 23.6 29.7 150 6.44 Lead 15 NA < 42.2* < 42.2* < 1060* < 42.2* Mercury 2 3.7 < 0.1 < 0.1 < 0.1 < 0.1 Nickel N/A 730 60.7 48.3 < 111 8.67 Selenium 50 180 < 24.4 < 24.4 633 < 24.4 Silver N/A 180 < 7.78 < 7.78 < 194* < 7.78 Thallium 2 2.6 < 81.1* < 81.1* < 2030* < 81.1* Tin N/A 22000 < 40 < 40 < 1000 < 40 Vanadium N/A 260 22.2 38.2 139 < 2.22 Zinc N/A 11000 78.3 106 422 22.7 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 2* < 2* < 2* < 2* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* Aroclor 1254 N/A 0.033 < 1 < 1 < 1 < 1 Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A N/A < 10 < 10 < 10 < 10 2-Chlorophenol N/A 490 < 10 < 10 < 10 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-5 (Feb 2001).xls(q1gwcdh)\5/23/2006(4:19 PM)

### Table 5-5

Final Effluent Pond Groundwater Monitoring Data Feburary 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/01 02/14/01 02/14/01 02/14/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Methylnaphthalene N/A 30 < 10 < 10 < 10 < 10 2-Methylphenol N/A 120 < 10 < 10 < 10 < 10 2-Nitroaniline N/A 1800 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A N/A < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.15 < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A 0.0073 < 10 < 10 < 10 < 10 3-Methylphenol N/A N/A < 10 < 10 < 10 < 10 3-Nitroaniline N/A 1800 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A N/A < 10* < 10* < 10* < 10* 4-Bromophenyl phenyl ether N/A 37 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 4-Chloroaniline N/A N/A < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A 150 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 4-Methylphenol N/A N/A < 10 < 10 < 10 < 10 4-Nitroaniline N/A 180 < 10 < 10 < 10 < 10 4-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A 290 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A N/A < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A 2 < 10 < 10 < 10 < 10 Acenaphthene N/A N/A < 10 < 10 < 10 < 10 Acenaphthylene N/A 370 < 10 < 10 < 10 < 10 Acetamide, N-9H-Fluoren-2-yl N/A NA < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 1.3 1.3 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-5 (Feb 2001).xls(q1gwcdh)\5/23/2006(4:19 PM)

### Table 5-5

Final Effluent Pond Groundwater Monitoring Data Feburary 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/01 02/14/01 02/14/01 02/14/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* 2.4 < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A 2.6 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* < 10* 4.2 < 10* n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-5 (Feb 2001).xls(q1gwcdh)\5/23/2006(4:19 PM)

### Table 5-5

Final Effluent Pond Groundwater Monitoring Data Feburary 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/01 02/14/01 02/14/01 02/14/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-5 (Feb 2001).xls(q1gwcdh)\5/23/2006(4:19 PM)

### Table 5-5

Final Effluent Pond Groundwater Monitoring Data Feburary 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/01 02/14/01 02/14/01 02/14/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 1.6 21 < 10* 29.9 Toluene 1000 750 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 9.4 156 4.3 174 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene N/A 61 3.2 8.5 < 10 17 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-5 (Feb 2001).xls(q1gwcdh)\5/23/2006(4:19 PM)

### Table 5-6

Final Effluent Pond Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-1 FEP-2 FEP-3 FEP-3DUP MWA-17

Date Sampled 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 12 8 < 5 < 5 6 Fluoride, Total 4000 2200 2700 11900 300 300 2400 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 38.9* < 38.9* Arsenic 50 0.045 < 18.9* < 18.9* 42.8 28.7 < 18.9* Barium 2000 2600 296 684 882 840 1860 Beryllium 4 73 1.67 2.89 5.22 5 1.78 Cadmium 5 18 2.22 2.89 < 2.22* < 2.22* 4.22 Chromium 100 110 46.3 51.6 109 109 51.7 Cobalt N/A 730 221 31.3 74.8 70.6 56.9 Copper 1300 1500 43.8 37.7 226 215 157 Lead 15 NA 64.2 74.9 154 132 118 Mercury 2 3.7 0.109 < 0.1 0.321 0.362 < 0.1 Nickel N/A 730 96.4 73.2 125 124 96.8 Selenium 50 180 < 24.4 < 24.4 25.2 < 24.4 < 24.4 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 7.78 < 7.78 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* < 81.1* < 81.1* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 55 84.7 222 215 64 Zinc N/A 11000 158 196 415 416 327 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 N/A 0.033 < 1 < 1 < 1 < 1 < 1 Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-6 (May 2001).xls(fepq2gwcdh)\5/23/2006(4:20 PM)

### Table 5-6

Final Effluent Pond Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-1 FEP-2 FEP-3 FEP-3DUP MWA-17

Date Sampled 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A NA < 10 < 10 < 10 < 10 < 10 Acetamide, N-9H-Fluoren-2-yl N/A N/A < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 3.2 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10* < 10* < 10* < 10* < 10* Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-6 (May 2001).xls(fepq2gwcdh)\5/23/2006(4:20 PM)

### Table 5-6

Final Effluent Pond Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-1 FEP-2 FEP-3 FEP-3DUP MWA-17

Date Sampled 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10 Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A 1.5 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 4.7 2.3 1.5 1.3 1.4 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-6 (May 2001).xls(fepq2gwcdh)\5/23/2006(4:20 PM)

### Table 5-6

Final Effluent Pond Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-1 FEP-2 FEP-3 FEP-3DUP MWA-17

Date Sampled 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100* Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 1.2 22.2 < 10* < 10* 19.5 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 8.4 116 6 6.2 135 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10*

KN6\BWXT\FEP\02 GWAR\Table 5-6 (May 2001).xls(fepq2gwcdh)\5/23/2006(4:20 PM)

### Table 5-6

Final Effluent Pond Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-1 FEP-2 FEP-3 FEP-3DUP MWA-17

Date Sampled 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-6 (May 2001).xls(fepq2gwcdh)\5/23/2006(4:20 PM)

### Table 5-7

Final Effluent Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-1 FEP-1DUP FEP-2 FEP-3 MWA-17

Date Sampled 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 3200 3200 11000 200 1900 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 38.9* < 38.9* Arsenic 50 0.045 < 18.9* < 18.9* < 18.9* < 18.9* < 18.9* Barium 2000 2600 293 231 338 370 461 Beryllium 4 73 1.11 0.667 0.667 1.67 < 0.444 Cadmium 5 18 < 2.22 < 2.22 < 2.22 < 2.22 < 2.22 Chromium 100 110 31.2 20.2 < 8.89 36.3 < 8.89 Cobalt N/A 730 106 60 8.67 17.7 6.89 Copper 1300 1500 29.2 37 21.6 49.3 30.6 Lead 15 NA < 42.2* < 42.2* < 42.2* < 42.2* < 42.2* Mercury 2 3.7 < 0.1 < 0.1 < 0.1 < 0.1 < 0.1 Nickel N/A 730 72.4 70.6 30.2 35.3 12.3 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 24.4 < 24.4 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 7.78 < 7.78 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* 135 < 81.1* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 50.6 29 13 81.3 4.89 Zinc N/A 11000 87.1 62.1 27 105 38.9 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 N/A 0.033 < 1 < 1 < 1 < 1 < 1 Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 2-Chlorophenol N/A 490 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-7 (Aug 2001).xls(fepq3gwcdh)\5/23/2006(4:21 PM)

### Table 5-7

Final Effluent Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-1 FEP-1DUP FEP-2 FEP-3 MWA-17

Date Sampled 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Methylnaphthalene N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 120 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A N/A < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A 0.0073 < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A 1800 < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A N/A < 10* < 10* < 10* < 10* < 10* 4-Bromophenyl phenyl ether N/A 37 < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A 150 < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A 290 < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A N/A < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A 2 < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A 370 < 10 < 10 < 10 < 10 < 10 Acetamide, N-9H-Fluoren-2-yl N/A NA < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-7 (Aug 2001).xls(fepq3gwcdh)\5/23/2006(4:21 PM)

### Table 5-7

Final Effluent Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-1 FEP-1DUP FEP-2 FEP-3 MWA-17

Date Sampled 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 4.4 < 10* < 10* < 10* 3 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-7 (Aug 2001).xls(fepq3gwcdh)\5/23/2006(4:21 PM)

### Table 5-7

Final Effluent Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-1 FEP-1DUP FEP-2 FEP-3 MWA-17

Date Sampled 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-7 (Aug 2001).xls(fepq3gwcdh)\5/23/2006(4:21 PM)

### Table 5-7

Final Effluent Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-1 FEP-1DUP FEP-2 FEP-3 MWA-17

Date Sampled 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 1.4 1.4 15 < 10* 1.4 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 8.6 8.5 103 6.1 11.9 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene N/A 61 2.6 2.6 4.3 < 10 < 10 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-7 (Aug 2001).xls(fepq3gwcdh)\5/23/2006(4:21 PM)

### Table 5-8

Final Effluent Pond Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 4000 3800 13000 200 2600 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 58.7* < 58.7* < 58.7* < 58.7* < 58.7* Arsenic 50 0.045 < 27.7* < 27.7* < 27.7* < 27.7* < 27.7* Barium 2000 2600 181 224 339 236 515 Beryllium 4 73 0.889 1.33 1.33 0.889 0.667 Cadmium 5 18 < 3.78 < 3.78 < 3.78 < 3.78 < 3.78 Chromium 100 110 25.9 34.1 25.1 16.4 13.1 Cobalt N/A 730 81.8 86.3 17.7 8.33 19 Copper 1300 1500 23.4 35.7 21.2 19.6 24.6 Lead 15 NA < 54.3* < 54.3* < 54.3* < 54.3* < 54.3* Mercury 2 3.7 1.12 < 0.2 < 0.2 < 0.2 < 0.2 Nickel N/A 730 70.1 75.6 42.6 13.3 36 Selenium 50 180 < 28.6 < 28.6 < 28.6 < 28.6 < 28.6 Silver N/A 180 < 9 < 9 < 9 < 9 < 9 Thallium 2 2.6 < 67.7* < 67.7* < 67.7* < 67.7* < 67.7* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 29.8 40.8 31.3 28 15.8 Zinc N/A 11000 98.2 111 72.7 71.8 129 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10.1 < 10 < 10.3 < 10.2 < 10 1,2,4-Trichlorobenzene 70 190 < 10.1 < 10 < 10.3 < 10.2 < 10 1,2-Dichlorobenzene 600 270 < 10.1 < 10 < 10.3 < 10.2 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10.1 < 10 < 10.3 < 10.2 < 10 1,3-Dichlorobenzene 600 180 < 10.1 < 10 < 10.3 < 10.2 < 10 1,3-Dinitrobenzene N/A 3.7 < 10.1* < 10* < 10.3* < 10.2* < 10* 1,4-Dichlorobenzene 75 0.47 < 10.1* < 10* < 10.3* < 10.2* < 10* 1,4-Naphthoquinone N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 1-Methyl Naphthalene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 1-Naphthylamine N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10.1 < 10 < 10.3 < 10.2 < 10 2,4,5-Trichlorophenol N/A 3700 < 10.1 < 10 < 10.3 < 10.2 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10.1* < 10* < 10.3* < 10.2* < 10* 2,4-Dichlorophenol N/A 110 < 10.1 < 10 < 10.3 < 10.2 < 10 2,4-Dimethylphenol N/A 730 < 10.1 < 10 < 10.3 < 10.2 < 10 2,4-Dinitrophenol N/A 73 < 10.1 < 10 < 10.3 < 10.2 < 10 2,4-Dinitrotoluene N/A 73 < 10.1 < 10 < 10.3 < 10.2 < 10 2,6-Dichlorophenol N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 2,6-Dinitrotoluene N/A 37 < 10.1 < 10 < 10.3 < 10.2 < 10 2-Acetylaminofluorene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 2-Chloronaphthalene N/A 490 < 10.1 < 10 < 10.3 < 10.2 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-8 (Nov 2001).xls(fepq4gwcdh)\5/23/2006(4:22 PM)

### Table 5-8

Final Effluent Pond Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Chlorophenol N/A 30 < 10.1 < 10 < 10.3 < 10.2 < 10 2-Methylnaphthalene N/A 120 < 10.1 < 10 < 10.3 < 10.2 < 10 2-Methylphenol N/A 1800 < 10.1 < 10 < 10.3 < 10.2 < 10 2-Nitroaniline N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 2-Nitrophenol N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 2-Picoline N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10.1* < 10* < 10.3* < 10.2* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10.1* < 10* < 10.3* < 10.2* < 10* 3-Methylcholanthrene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 3-Methylphenol N/A 1800 < 10.1 < 10 < 10.3 < 10.2 < 10 3-Nitroaniline N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10.1 < 10 < 10.3 < 10.2 < 10 4-Bromophenyl phenyl ether N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 4-Chloro-3-methylphenol N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 4-Chloroaniline N/A 150 < 10.1 < 10 < 10.3 < 10.2 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 4-Dimethylaminoazobenzene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 4-Methylphenol N/A 180 < 10.1 < 10 < 10.3 < 10.2 < 10 4-Nitroaniline N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 4-Nitrophenol N/A 290 < 10.1 < 10 < 10.3 < 10.2 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 5-nitro-o-Toluidine N/A 2 < 10.1* < 10* < 10.3* < 10.2* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Acenaphthene N/A 370 < 10.1 < 10 < 10.3 < 10.2 < 10 Acenaphthylene N/A NA < 10.1 < 10 < 10.3 < 10.2 < 10 Acetophenone N/A 0.042 < 10.1* < 10* < 10.3* < 10.2* < 10* Anthracene N/A 1800 < 10.1 < 10 < 10.3 < 10.2 < 10 Azobenzene N/A 0.61 < 10.1* < 10* < 10.3* < 10.2* < 10* Benzenamine N/A 12 < 10.1 < 10 < 10.3 < 10.2 < 10 Benzidine N/A 0.00029 < 10.1* < 10* < 10.3* < 10.2* < 10* Benzo(a)anthracene N/A 0.092 < 10.1* < 10* < 10.3* < 10.2* < 10* Benzo(a)pyrene 0.2 0.0092 < 10.1* < 10* < 10.3* < 10.2* < 10* Benzo(b)fluoranthene N/A 0.092 < 10.1* < 10* < 10.3* < 10.2* < 10* Benzo(ghi)perylene N/A NA < 10.1 < 10 < 10.3 < 10.2 < 10 Benzo(k)fluoranthene N/A 0.92 < 10.1* < 10* < 10.3* < 10.2* < 10* Benzoic Acid N/A 150000 < 10.1 < 10 < 10.3 < 10.2 < 10 Benzyl Alcohol N/A 11000 < 10.1 < 10 < 10.3 < 10.2 < 10 Butyl benzyl phthalate N/A 7300 < 10.1 < 10 < 10.3 < 10.2 < 10 Carbazole N/A 3.3 < 10.1* < 10* < 10.3* < 10.2* < 10* Chlorobenzilate N/A 0.25 < 10.1* < 10* < 10.3* < 10.2* < 10* Chrysene N/A 9.2 < 10.1* < 10* < 10.3* < 10.2* < 10* Di-n-butyl phthalate N/A 3700 < 10.1 < 10 < 10.3 < 10.2 < 10 Di-n-octyl phthalate N/A 730 < 10.1 < 10 < 10.3 < 10.2 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10.1* < 10* < 10.3* < 10.2* < 10* Dibenzofuran N/A 24 < 10.1 < 10 < 10.3 < 10.2 < 10 Diethyl phthalate N/A 29000 < 10.1 < 10 < 10.3 < 10.2 < 10 Dimethyl phthalate N/A 370000 < 10.1 < 10 < 10.3 < 10.2 < 10 Dinoseb 7 37 < 10.1* < 10* < 10.3* < 10.2* < 10* Diphenylamine N/A 910 < 10.1 < 10 < 10.3 < 10.2 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-8 (Nov 2001).xls(fepq4gwcdh)\5/23/2006(4:22 PM)

### Table 5-8

Final Effluent Pond Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Ethyl Methanesulfonate N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Fluoranthene N/A 1500 < 10.1 < 10 < 10.3 < 10.2 < 10 Fluorene N/A 240 < 10.1 < 10 < 10.3 < 10.2 < 10 Hexachlorobenzene 1 0.042 < 10.1* < 10* < 10.3* < 10.2* < 10* Hexachlorobutadiene N/A 0.86 < 10.1* < 10* < 10.3* < 10.2* < 10* Hexachlorocyclopentadiene 50 220 < 10.1 < 10 < 10.3 < 10.2 < 10 Hexachloroethane N/A 4.8 < 10.1* < 10* < 10.3* < 10.2* < 10* Hexachloropropene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10.1* < 10* < 10.3* < 10.2* < 10* Isophorone N/A 70 < 10.1 < 10 < 10.3 < 10.2 < 10 Isosafrole N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Methapyrilene N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Methyl Methanesulfonate N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10.1* < 10* < 10.3* < 10.2* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10.1* < 10* < 10.3* < 10.2* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10.1* < 10* < 10.3* < 10.2* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10.1* < 10* < 10.3* < 10.2* < 10* N-Nitrosomorpholine N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 N-Nitrosopiperidine N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10.1* < 10* < 10.3* < 10.2* < 10* Naphthalene N/A 6.5 < 10.1* < 10* < 10.3* < 10.2* < 10* Nitrobenzene N/A 3.5 < 10.1* < 10* < 10.3* < 10.2* < 10* Pentachlorobenzene N/A 29 < 10.1 < 10 < 10.3 < 10.2 < 10 Pentachloroethane N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Pentachloronitrobenzene N/A 0.26 < 10.1* < 10* < 10.3* < 10.2* < 10* Pentachlorophenol 1 0.56 < 10.1* < 10* < 10.3* < 10.2* < 10* Phenacetin N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Phenanthrene N/A NA < 10.1 < 10 < 10.3 < 10.2 < 10 Phenol N/A 22000 < 10.1 < 10 < 10.3 < 10.2 < 10 Pronamide N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 Pyrene N/A 180 < 10.1 < 10 < 10.3 < 10.2 < 10 Pyridine N/A 37 < 10.1 < 10 < 10.3 < 10.2 < 10 Safrole N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 beta-Naphthylamine N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10.1 < 10 < 10.3 < 10.2 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10.1* < 10* < 10.3* < 10.2* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10.1* < 10* < 10.3* < 10.2* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 2 1.9 4.3 3.6 4.5 n-Nitroso-di-n-propylamine N/A 0.0096 < 10.1* < 10* < 10.3* < 10.2* < 10* o-Toluidine N/A 0.28 < 10.1* < 10* < 10.3* < 10.2* < 10* p-Phenylenediamine N/A 6900 < 10.1 < 10 < 10.3 < 10.2 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-8 (Nov 2001).xls(fepq4gwcdh)\5/23/2006(4:22 PM)

### Table 5-8

Final Effluent Pond Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-8 (Nov 2001).xls(fepq4gwcdh)\5/23/2006(4:22 PM)

### Table 5-8

Final Effluent Pond Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 1.9 2 13.1 < 10* 46.5 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 38.4 38.1 254 5 214 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 3.2 3.2 7 < 10 24.4 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-8 (Nov 2001).xls(fepq4gwcdh)\5/23/2006(4:22 PM)

### Table 5-9

Final Effluent Pond Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/02 02/14/02 02/14/02 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 2410 2320 8370 400 1910 Antimony 6 15 < 58.7* < 58.7* < 58.7* < 58.7* < 58.7* Arsenic 50 0.045 < 27.7* < 27.7* < 27.7* < 27.7* < 27.7* Barium 2000 2600 150 143 342 221 154 Beryllium 4 73 0.333 0.333 0.778 < 0.233 < 0.233 Cadmium 5 18 < 3.78 < 3.78 < 3.78 < 3.78 < 3.78 Chromium 100 110 12.9 13.9 16.4 9.67 < 8.89 Cobalt N/A 730 36.2 35.9 9.22 3.56 < 3.33 Copper 1300 1500 13.1 15.8 10.3 7.22 9 Lead 15 N/A < 54.3* < 54.3* < 54.3* < 54.3* < 54.3* Mercury 2 3.7 < 0.2 < 0.2 < 0.2 < 0.2 Nickel N/A 730 42.6 43.6 33.8 < 11.3 < 11.3 Selenium 50 180 < 28.6 < 28.6 < 28.6 < 28.6 < 28.6 Silver N/A 180 < 9 < 9 < 9 < 9 < 9 Thallium 2 2.6 < 67.7* < 67.7* < 67.7* < 67.7* < 67.7* Tin N/A 22000 < 12.2 < 12.2 < 12.2 < 12.2 < 12.2 Vanadium N/A 260 13.9 10.4 19.4 9.33 < 4.78 Zinc N/A 11000 37.2 35.4 41.6 37.6 17.9 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-9 (Feb 2002).xls(fepq102gwcdh)\5/23/2006(4:22 PM)

### Table 5-9

Final Effluent Pond Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/02 02/14/02 02/14/02 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A N/A < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A N/A < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10 Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-9 (Feb 2002).xls(fepq102gwcdh)\5/23/2006(4:22 PM)

### Table 5-9

Final Effluent Pond Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/02 02/14/02 02/14/02 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A 1.1 1.2 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* 1.4 4.8 1.7 1.6 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 10* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10*

KN6\BWXT\FEP\02 GWAR\Table 5-9 (Feb 2002).xls(fepq102gwcdh)\5/23/2006(4:22 PM)

### Table 5-9

Final Effluent Pond Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/02 02/14/02 02/14/02 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 10 < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 1.6 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100* Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10*

KN6\BWXT\FEP\02 GWAR\Table 5-9 (Feb 2002).xls(fepq102gwcdh)\5/23/2006(4:22 PM)

### Table 5-9

Final Effluent Pond Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FEP-1DUP FEP-1 FEP-2 FEP-3 MWA-17

Date Sampled 02/14/02 02/14/02 02/14/02 02/14/02 02/14/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 1.4 1.4 9.6 < 10* 1.3 Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 8.3 8.2 30.1 2.4 10.2 Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 2.2 2.2 1.1 < 10 1.2 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-9 (Feb 2002).xls(fepq102gwcdh)\5/23/2006(4:22 PM)

### Table 5-10

Landfill 1 Groundwater Monitoring Data February 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 02/26/01 02/26/01 02/26/01 02/26/01 02/26/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 < 100 < 100 100 100 100 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 38.9* < 38.9* Arsenic 50 0.045 < 18.9* < 18.9* < 18.9* 27.3 < 18.9* Barium 2000 2600 333 5720 522 556 176 Beryllium 4 73 2.11 2.22 4.11 3.89 1.56 Cadmium 5 18 < 2.22 < 2.22 < 2.22 6.78 < 2.22 Chromium 100 110 33.7 38.7 88.4 72 27.3 Cobalt N/A 730 20.6 21.6 63.8 56.3 19 Copper 1300 1500 44 49.2 97.8 94.1 25.3 Lead 15 NA < 42.2* < 42.2* 79.8 85.3 < 42.2* Mercury 2 3.7 < 0.1 0.119 < 0.1 0.211 < 0.1 Nickel N/A 730 36.1 45 93.9 94.8 31.4 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 24.4 < 24.4 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 7.78 < 7.78 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* < 81.1* < 81.1* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 65.2 69.3 126 123 47.4 Zinc N/A 11000 148 156 320 275 121 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 2* < 2* < 2* < 2* < 2* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 N/A 0.033 < 1 < 1 < 1 < 1 < 1 Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R Sample Number

Date Sampled

KN6\BWXT\FEP\02 GWAR\Table 5-10 (LF-1 Feb 2001).xls(flq1gwcdh)\5/23/2006(4:23 PM)

### Table 5-10

Landfill 1 Groundwater Monitoring Data February 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 02/26/01 02/26/01 02/26/01 02/26/01 02/26/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A NA < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-10 (LF-1 Feb 2001).xls(flq1gwcdh)\5/23/2006(4:23 PM)

### Table 5-10

Landfill 1 Groundwater Monitoring Data February 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 02/26/01 02/26/01 02/26/01 02/26/01 02/26/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* < 10* < 10* < 10* < 10* n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* 6.4 < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 10 < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 10* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 10 < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 10* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-10 (LF-1 Feb 2001).xls(flq1gwcdh)\5/23/2006(4:23 PM)

### Table 5-10

Landfill 1 Groundwater Monitoring Data February 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 02/26/01 02/26/01 02/26/01 02/26/01 02/26/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 10* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 10* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 10* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 10* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 10* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 10 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 10 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 100* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 10 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10* < 10* < 10* < 10* < 10* 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 10 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 10 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 100* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 100* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 10 < 10 Acetone N/A 610 < 10 < 10 < 10 < 10 < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 100 < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 10 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 10* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 10 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 10* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 10* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 10* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 10 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 10* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 10 < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 10* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 10* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 10* < 10* Cumene N/A 660 < 10 < 10 < 10 < 10 < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 10* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 10 < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 10 < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 100 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 10 < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 10 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 100 < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 10 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 10* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 100* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-10 (LF-1 Feb 2001).xls(flq1gwcdh)\5/23/2006(4:23 PM)

### Table 5-10

Landfill 1 Groundwater Monitoring Data February 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 02/26/01 02/26/01 02/26/01 02/26/01 02/26/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Methylene chloride 5 4.1 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Styrene 100 1600 < 10 < 10 < 10 < 10 < 10 Tetrachloroethene 5 0.63 43.8 45.1 50.6 11800 < 10* Toluene 1000 750 < 10 < 10 < 10 < 10 < 10 Trichloroethene 5 0.026 28.7 29.8 5.4 121 < 10* Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 10 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 10 < 10 Vinyl Chloride 2 0.015 1.9 2 < 10* < 10* < 10* cis-1,2-Dichloroethene 70 61 50.9 53.7 < 10 3.7 < 10 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 10 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 10 < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 10 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 10 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 10* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 10 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 10 < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 10* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 10* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-10 (LF-1 Feb 2001).xls(flq1gwcdh)\5/23/2006(4:23 PM)

### Table 5-11

Landfill 1 Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 6 7 Fluoride, Total 4000 2200 200 200 200 200 200 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 38.9* < 38.9* Arsenic 50 0.045 30.6 40.8 34.9 37.8 56.8 Barium 2000 2600 533 372 375 411 624 Beryllium 4 73 3.67 2.44 3 2.78 5.89 Cadmium 5 18 < 2.22* < 2.22* < 2.22* < 2.22* < 2.22* Chromium 100 110 77.3 51.8 66.9 61.8 121 Cobalt N/A 730 39.4 23.3 35.7 35.3 70.8 Copper 1300 1500 73 54.3 66 59.8 102 Lead 15 NA 111 68.7 85.9 76.3 124 Mercury 2 3.7 < 0.1 < 0.1 < 0.1 < 0.1 < 0.1 Nickel N/A 730 76.7 49.6 69.2 66.1 131 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 24.4 < 24.4 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 7.78 < 7.78 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* 85.8 142 Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 114 89.7 107 107 209 Zinc N/A 11000 252 166 239 212 457 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 N/A 0.033 < 1 < 1 < 1 < 1 < 1 Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R Sample Number

Date Sampled

KN6\BWXT\FEP\02 GWAR\Table 5-11 (LF-1 May 2001).xls(flq2gwcdh)\5/23/2006(4:25 PM)

### Table 5-11

Landfill 1 Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A NA < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-11 (LF-1 May 2001).xls(flq2gwcdh)\5/23/2006(4:25 PM)

### Table 5-11

Landfill 1 Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10 Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* < 10* < 10* < 10* < 10* n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 1000* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 1000* < 10

KN6\BWXT\FEP\02 GWAR\Table 5-11 (LF-1 May 2001).xls(flq2gwcdh)\5/23/2006(4:25 PM)

### Table 5-11

Landfill 1 Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 1000* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 1000* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 1000* < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 1000* < 10* 1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 1000* < 10* 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 1000* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 1000* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 1000* < 10 1,2-Dichloroethane 5 0.12 < 10 < 10 < 10 < 1000* < 10 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 1000* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 1000 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 1000* < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 1000* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 10000* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 1000 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 1000* < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 1000 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 10000* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 10000* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 1000* < 10 Acetone N/A 610 < 10 < 10 < 10 < 1000* 358 Acetonitrile N/A 120 < 100* < 100* < 100* < 10000* < 100* Allyl Chloride N/A N/A < 10 < 10 < 10 < 1000 < 10 Benzene 5 0.32 < 10 < 10 < 10 < 1000 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 1000* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 1000* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 1000* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 1000 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 1000* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 1000* < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 1000* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 1000* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 1000* < 10* Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 1000* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 1000* < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 1000* < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 10000* < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 1000* < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 1000* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 1000 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 10000* < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 1000 < 10 Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 10000* < 100* Methylene chloride 5 4.1 < 10* < 10* < 10* < 1000* < 10* Styrene 100 1600 < 10 < 10 < 10 < 1000* < 10 Tetrachloroethene 5 0.63 3.4 3.1 107 10900 5.4 Toluene 1000 750 < 10 < 10 < 10 < 1000* < 10

KN6\BWXT\FEP\02 GWAR\Table 5-11 (LF-1 May 2001).xls(flq2gwcdh)\5/23/2006(4:25 PM)

### Table 5-11

Landfill 1 Groundwater Monitoring Data May 2001 Sampling Event

BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 05/16/01 05/16/01 05/16/01 05/16/01 05/16/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Trichloroethene 5 0.026 91.5 78.5 9.4 407 < 10* Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 1000 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 1000* < 10 Vinyl Chloride 2 0.015 6 3.2 < 10* < 1000* < 10* cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 1000* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 1000 < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 1000* < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 1000* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 1000* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-11 (LF-1 May 2001).xls(flq2gwcdh)\5/23/2006(4:25 PM)

### Table 5-12

Landfill 1 Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 < 100 < 100 < 100 < 100 200 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 38.9* < 38.9* < 38.9* < 38.9* < 38.9* Arsenic 50 0.045 < 18.9* < 18.9* < 18.9* < 18.9* < 18.9* Barium 2000 2600 809 701 403 446 689 Beryllium 4 73 5.33 4.33 3 4 4.33 Cadmium 5 18 < 2.22 < 2.22 < 2.22 < 2.22 < 2.22 Chromium 100 110 78 59.1 46.7 57.6 64.6 Cobalt N/A 730 66.1 56.3 46.4 52 72.4 Copper 1300 1500 97.6 69.4 51.6 58.4 85.2 Lead 15 NA 81 50.4 < 42.2* < 42.2* 79.2 Mercury 2 3.7 0.164 0.137 0.103 < 0.1 < 0.1 Nickel N/A 730 97.1 64.9 66.3 78.2 89.7 Selenium 50 180 < 24.4 < 24.4 < 24.4 < 24.4 < 24.4 Silver N/A 180 < 7.78 < 7.78 < 7.78 < 7.78 < 7.78 Thallium 2 2.6 < 81.1* < 81.1* < 81.1* < 81.1* < 81.1* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 104 74.6 68.4 89.2 99 Zinc N/A 11000 271 197 191 272 263 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 N/A 0.033 < 1 < 1 < 1 < 1 < 1 Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Acetylaminofluorene N/A NA < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R Sample Number

Date Sampled

KN6\BWXT\FEP\02 GWAR\Table 5-12 (LF-1 Aug 2001).xls(flq3gwcdh)\5/23/2006(4:26 PM)

### Table 5-12

Landfill 1 Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A NA < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10 < 10 < 10 < 10 < 10 Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-12 (LF-1 Aug 2001).xls(flq3gwcdh)\5/23/2006(4:26 PM)

### Table 5-12

Landfill 1 Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* < 10* < 10* < 10* < 10* n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 1000* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 1000* < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 1000* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 1000* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 1000* < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 1000* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 1000 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 1000 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-12 (LF-1 Aug 2001).xls(flq3gwcdh)\5/23/2006(4:26 PM)

### Table 5-12

Landfill 1 Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 1000* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 1000* < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 1000 < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 1000* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 1000* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 1000* < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 1000* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 1000* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 1000 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 1000* < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 1000* < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 1000 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 1000* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 10000* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 1000 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 1000* < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 1000 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 1000* < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 10000* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 10000* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 1000* < 10 Acetone N/A 610 < 10 < 10 < 10 < 1000* < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 10000* < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 1000 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 1000* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 1000 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 1000 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 1000* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 1000* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 1000* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 1000 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 1000* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 1000* < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 1000* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 1000* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 1000* < 10* Cumene N/A 660 < 10 < 10 < 10 < 1000* < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 1000* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 1000* < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 1000* < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 10000 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 1000* < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 1000* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 1000* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 1000 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 10000* < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 1000 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10 < 10 < 10 < 1000 < 10 Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 10000* < 100*

KN6\BWXT\FEP\02 GWAR\Table 5-12 (LF-1 Aug 2001).xls(flq3gwcdh)\5/23/2006(4:26 PM)

### Table 5-12

Landfill 1 Groundwater Monitoring Data August 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

FL-1 FL-1DUP FL-2 FL-3 FL-4 08/22/01 08/22/01 08/22/01 08/22/01 08/22/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Methylene chloride 5 4.1 < 10* < 10* < 10* < 1000* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 1000* < 10* Styrene 100 1600 < 10 < 10 < 10 < 1000* < 10 Tetrachloroethene 5 0.63 22.2 22.6 46.8 6720 < 10* Toluene 1000 750 < 10 < 10 < 10 < 1000* < 10 Trichloroethene 5 0.026 53 54.2 5.1 268 < 10* Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 1000 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 1000* < 10 Vinyl Chloride 2 0.015 2.4 2.5 < 10* < 1000* < 10* cis-1,2-Dichloroethene 70 61 86 87.2 < 10 < 1000* < 10 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 1000* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 1000 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 1000* < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 1000 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 1000 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 1000* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 1000* < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 1000* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 1000* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available.

KN6\BWXT\FEP\02 GWAR\Table 5-12 (LF-1 Aug 2001).xls(flq3gwcdh)\5/23/2006(4:26 PM)

### Table 5-13

Landfill 1 Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

FL-1DUP FL-1 FL-2 FL-3 FL-4 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 < 5 < 5 < 5 < 5 < 5 Fluoride, Total 4000 2200 200 200 < 100 < 100 < 100 Sulfide N/A N/A < 1000 < 1000 < 1000 < 1000 < 1000 Antimony 6 15 < 58.7* < 58.7* < 58.7* < 58.7* < 58.7* Arsenic 50 0.045 56.6 45.7 73.2 83.9 72 Barium 2000 2600 572 378 416 570 343 Beryllium 4 73 3.67 2.33 3.44 4 3.11 Cadmium 5 18 < 3.78 < 3.78 < 3.78 < 3.78 < 3.78 Chromium 100 110 79 47.2 83.3 93.7 70 Cobalt N/A 730 43.1 23.8 49.2 59.4 45 Copper 1300 1500 74.6 43.6 78.9 184 46.2 Lead 15 NA < 54.3* < 54.3* < 54.3* < 54.3* < 54.3* Mercury 2 3.7 0.598 < 0.2 < 0.2 < 0.2 < 0.2 Nickel N/A 730 79.4 46.2 73.4 93.3 90.8 Selenium 50 180 < 28.6 < 28.6 < 28.6 < 28.6 29.1 Silver N/A 180 < 9 < 9 < 9 < 9 < 9 Thallium 2 2.6 < 67.7* < 67.7* < 67.7* < 67.7* < 67.7* Tin N/A 22000 < 40 < 40 < 40 < 40 < 40 Vanadium N/A 260 126 78.8 103 143 112 Zinc N/A 11000 285 182 302 311 310 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10 GROUNDWATE R Sample Number

Date Sampled

KN6\BWXT\FEP\02 GWAR\Table 5-13 (LF-1 Nov 2001).xls(flq4gwcdh)\5/23/2006(4:27 PM)

### Table 5-13

Landfill 1 Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

FL-1DUP FL-1 FL-2 FL-3 FL-4 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A NA < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A NA < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 < 10 < 10 < 10 < 10 < 10 Di-n-octyl phthalate N/A 730 < 10 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-13 (LF-1 Nov 2001).xls(flq4gwcdh)\5/23/2006(4:27 PM)

### Table 5-13

Landfill 1 Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

FL-1DUP FL-1 FL-2 FL-3 FL-4 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10 Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A NA < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 < 10* < 10* < 10* < 10* < 10* n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 1000* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 1000* < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 1000* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 1000* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 1000* < 10

KN6\BWXT\FEP\02 GWAR\Table 5-13 (LF-1 Nov 2001).xls(flq4gwcdh)\5/23/2006(4:27 PM)

### Table 5-13

Landfill 1 Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

FL-1DUP FL-1 FL-2 FL-3 FL-4 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 1000* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 1000 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 1000 < 10 1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 1000* < 10* 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 1000* < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 1000* < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 1000* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 1000* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 1000* < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 1000* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 1000* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 1000 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 1000* < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 1000* < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 1000 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 1000* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 10000* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 1000 < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 1000* < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 1000 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 1000 < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 10000* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 10000* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 1000* < 10 Acetone N/A 610 < 10 < 10 < 10 < 1000* < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 10000* < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 1000 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 1000* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 1000 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 1000 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 1000* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 1000* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 1000* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 1000 < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 1000* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 1000* < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 1000* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 1000* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 1000* < 10* Cumene N/A 660 < 10 < 10 < 10 < 1000* < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 1000* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 1000* < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 1000* < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 10000 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 1000* < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 1000* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 1000* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 1000 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-13 (LF-1 Nov 2001).xls(flq4gwcdh)\5/23/2006(4:27 PM)

### Table 5-13

Landfill 1 Groundwater Monitoring Data November 2001 Sampling Event BWX Technologies, Inc. Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

FL-1DUP FL-1 FL-2 FL-3 FL-4 11/12/01 11/12/01 11/12/01 11/12/01 11/12/01 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R Sample Number

Date Sampled

Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 10000* < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 1000 < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 1000* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 10000* < 100* Methylene chloride 5 4.1 < 10* < 10* < 10* < 1000* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 1000* < 10* Styrene 100 1600 < 10 < 10 < 10 < 1000* < 10 Tetrachloroethene 5 0.63 29.8 29.8 45 4120 < 10* Toluene 1000 750 < 10 < 10 < 10 < 1000* < 10 Trichloroethene 5 0.026 41.6 40.2 4.6 228 < 10* Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 1000 < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 1000* < 10 Vinyl Chloride 2 0.015 2 2 < 10* < 1000* < 10* cis-1,2-Dichloroethene 70 61 60.9 60.6 < 10 < 1000* < 10 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 1000* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 1000 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 1000* < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 1000 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 1000 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 1000* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 1000* < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 1000* < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 1000* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 1000* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

KN6\BWXT\FEP\02 GWAR\Table 5-13 (LF-1 Nov 2001).xls(flq4gwcdh)\5/23/2006(4:27 PM)

### Table 5-14

Landfill 1 Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc Mt. Athos Site, Lynchburg, Virginia

(Page 1 of 5)

Sample Number FL-1DUP FL-1 FL-2 FL-3 FL-4

Date Sampled 02/15/02 02/15/02 02/15/02 02/15/02 02/15/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L Cyanide, Total 200 730 12 13 83 < 5 < 5 Fluoride, Total 4000 2200 140 140 140 220 140 Antimony 6 15 < 58.7* < 58.7* < 58.7* < 58.7* < 58.7* Arsenic 50 0.045 < 27.7* < 27.7* 49.8 80 44.3 Barium 2000 2600 393 308 633 1200 447 Beryllium 4 73 2.33 1.67 4.56 8.22 3.56 Cadmium 5 18 < 3.78 < 3.78 < 3.78 6.56 < 3.78 Chromium 100 110 61 42.6 133 210 87.4 Cobalt N/A 730 28.3 19.1 64.6 113 50.4 Copper 1300 1500 53.2 39 112 190 79.7 Lead 15 N/A < 54.3* < 54.3* 58.4 166 62.6 Mercury 2 3.7 < 0.2 < 0.2 < 0.2 0.3 < 0.2 Nickel N/A 730 55.2 34.6 119 198 95.6 Selenium 50 180 29.1 < 28.6 < 28.6 < 28.6 < 28.6 Silver N/A 180 < 9 < 9 < 9 < 9 1790 Thallium 2 2.6 < 67.7* < 67.7* < 67.7* < 67.7* < 67.7* Tin N/A 22000 < 12.2 < 12.2 < 12.2 < 12.2 < 12.2 Vanadium N/A 260 87.1 64.1 183 341 143 Zinc N/A 11000 191 148 439 657 322 Aroclor 1016 0.5 0.96 < 1* < 1* < 1* < 1* < 1* Aroclor 1221 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1232 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1242 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1248 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1254 0.5 0.033 < 1* < 1* < 1* < 1* < 1* Aroclor 1260 0.5 0.033 < 1* < 1* < 1* < 1* < 1* (1,1'-Biphenyl)-4-Amine N/A N/A < 10 < 10 < 10 < 10 < 10 1,2,4,5-Tetrachlorobenzene N/A 11 < 10 < 10 < 10 < 10 < 10 1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 10 < 10 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 10 < 10 1,3,5-Trinitrobenzene N/A 1100 < 10 < 10 < 10 < 10 < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 10 < 10 1,3-Dinitrobenzene N/A 3.7 < 10* < 10* < 10* < 10* < 10* 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 10* < 10* 1,4-Naphthoquinone N/A N/A < 10 < 10 < 10 < 10 < 10 1-Methyl Naphthalene N/A N/A < 10 < 10 < 10 < 10 < 10 1-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 2,3,4,6-Tetrachlorophenol N/A 1100 < 10 < 10 < 10 < 10 < 10 2,4,5-Trichlorophenol N/A 3700 < 10 < 10 < 10 < 10 < 10 2,4,6-Trichlorophenol N/A 6.1 < 10* < 10* < 10* < 10* < 10* 2,4-Dichlorophenol N/A 110 < 10 < 10 < 10 < 10 < 10 2,4-Dimethylphenol N/A 730 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrophenol N/A 73 < 10 < 10 < 10 < 10 < 10 2,4-Dinitrotoluene N/A 73 < 10 < 10 < 10 < 10 < 10 2,6-Dichlorophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2,6-Dinitrotoluene N/A 37 < 10 < 10 < 10 < 10 < 10 2-Acetylaminofluorene N/A N/A < 10 < 10 < 10 < 10 < 10 2-Chloronaphthalene N/A 490 < 10 < 10 < 10 < 10 < 10 2-Chlorophenol N/A 30 < 10 < 10 < 10 < 10 < 10 GROUNDWATE R

KN6\BWXT\FEP\02 GWAR\Table 5-14 (LF-1 Feb 2002).xls(flq102gwcdh)\5/23/2006(4:28 PM)

### Table 5-14

Landfill 1 Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc Mt. Athos Site, Lynchburg, Virginia

(Page 2 of 5)

Sample Number FL-1DUP FL-1 FL-2 FL-3 FL-4

Date Sampled 02/15/02 02/15/02 02/15/02 02/15/02 02/15/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

2-Methylnaphthalene N/A 120 < 10 < 10 < 10 < 10 < 10 2-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 2-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 2-Nitrophenol N/A N/A < 10 < 10 < 10 < 10 < 10 2-Picoline N/A N/A < 10 < 10 < 10 < 10 < 10 3,3-Dichlorobenzidine N/A 0.15 < 10* < 10* < 10* < 10* < 10* 3,3-Dimethylbenzidine N/A 0.0073 < 10* < 10* < 10* < 10* < 10* 3-Methylcholanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 3-Methylphenol N/A 1800 < 10 < 10 < 10 < 10 < 10 3-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4,6-Dinitro-2-methylphenol N/A 37 < 10 < 10 < 10 < 10 < 10 4-Bromophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloro-3-methylphenol N/A N/A < 10 < 10 < 10 < 10 < 10 4-Chloroaniline N/A 150 < 10 < 10 < 10 < 10 < 10 4-Chlorophenyl phenyl ether N/A N/A < 10 < 10 < 10 < 10 < 10 4-Dimethylaminoazobenzene N/A N/A < 10 < 10 < 10 < 10 < 10 4-Methylphenol N/A 180 < 10 < 10 < 10 < 10 < 10 4-Nitroaniline N/A N/A < 10 < 10 < 10 < 10 < 10 4-Nitrophenol N/A 290 < 10 < 10 < 10 < 10 < 10 4-Nitroquinoline-1-Oxide N/A N/A < 10 < 10 < 10 < 10 < 10 5-nitro-o-Toluidine N/A 2 < 10* < 10* < 10* < 10* < 10* 7,12-Dimethylbenz(a)Anthracene N/A N/A < 10 < 10 < 10 < 10 < 10 Acenaphthene N/A 370 < 10 < 10 < 10 < 10 < 10 Acenaphthylene N/A N/A < 10 < 10 < 10 < 10 < 10 Acetophenone N/A 0.042 < 10* < 10* < 10* < 10* < 10* Anthracene N/A 1800 < 10 < 10 < 10 < 10 < 10 Azobenzene N/A 0.61 < 10* < 10* < 10* < 10* < 10* Benzenamine N/A 12 < 10 < 10 < 10 < 10 < 10 Benzidine N/A 0.00029 < 10* < 10* < 10* < 10* < 10* Benzo(a)anthracene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(a)pyrene 0.2 0.0092 < 10* < 10* < 10* < 10* < 10* Benzo(b)fluoranthene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Benzo(ghi)perylene N/A N/A < 10 < 10 < 10 < 10 < 10 Benzo(k)fluoranthene N/A 0.92 < 10* < 10* < 10* < 10* < 10* Benzoic Acid N/A 150000 < 10 < 10 < 10 < 10 < 10 Benzyl Alcohol N/A 11000 < 10 < 10 < 10 < 10 < 10 Butyl benzyl phthalate N/A 7300 < 10 < 10 < 10 < 10 < 10 Carbazole N/A 3.3 < 10* < 10* < 10* < 10* < 10* Chlorobenzilate N/A 0.25 < 10* < 10* < 10* < 10* < 10* Chrysene N/A 9.2 < 10* < 10* < 10* < 10* < 10* Di-n-butyl phthalate N/A 3700 2.7 < 10 < 10 < 10 1 Di-n-octyl phthalate N/A 730 24.3 < 10 < 10 < 10 < 10 Dibenz(a,h)anthracene N/A 0.0092 < 10* < 10* < 10* < 10* < 10* Dibenzofuran N/A 24 < 10 < 10 < 10 < 10 < 10 Diethyl phthalate N/A 29000 < 10 < 10 < 10 < 10 < 10 Dimethyl phthalate N/A 370000 < 10 < 10 < 10 < 10 < 10 Dinoseb 7 37 < 10* < 10* < 10* < 10* < 10* Diphenylamine N/A 910 < 10 < 10 < 10 < 10 < 10 Ethyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10

KN6\BWXT\FEP\02 GWAR\Table 5-14 (LF-1 Feb 2002).xls(flq102gwcdh)\5/23/2006(4:28 PM)

### Table 5-14

Landfill 1 Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc Mt. Athos Site, Lynchburg, Virginia

(Page 3 of 5)

Sample Number FL-1DUP FL-1 FL-2 FL-3 FL-4

Date Sampled 02/15/02 02/15/02 02/15/02 02/15/02 02/15/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Fluoranthene N/A 1500 < 10 < 10 < 10 < 10 < 10 Fluorene N/A 240 < 10 < 10 < 10 < 10 < 10 Hexachlorobenzene 1 0.042 < 10* < 10* < 10* < 10* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 10* < 10* Hexachlorocyclopentadiene 50 220 < 10 < 10 < 10 < 10 < 10 Hexachloroethane N/A 4.8 < 10* < 10* < 10* < 10* < 10* Hexachloropropene N/A N/A < 10 < 10 < 10 < 10 < 10 Indeno(1,2,3-cd)pyrene N/A 0.092 < 10* < 10* < 10* < 10* < 10* Isophorone N/A 70 < 10 < 10 < 10 < 10 < 10 Isosafrole N/A N/A < 10 < 10 < 10 < 10 < 10 Methapyrilene N/A N/A < 10 < 10 < 10 < 10 < 10 Methyl Methanesulfonate N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosodi-N-Butylamine N/A 0.00193 < 10* < 10* < 10* < 10* < 10* N-Nitrosodiethylamine N/A 0.00045 < 10* < 10* < 10* < 10* < 10* N-Nitrosodimethylamine N/A 0.0013 < 10* < 10* < 10* < 10* < 10* N-Nitrosomethylethylamine N/A 0.003 < 10* < 10* < 10* < 10* < 10* N-Nitrosomorpholine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopiperidine N/A N/A < 10 < 10 < 10 < 10 < 10 N-Nitrosopyrrolidine N/A 0.032 < 10* < 10* < 10* < 10* < 10* Naphthalene N/A 6.5 < 10* < 10* < 10* < 10* < 10* Nitrobenzene N/A 3.5 < 10* < 10* < 10* < 10* < 10* Pentachlorobenzene N/A 29 < 10 < 10 < 10 < 10 < 10 Pentachloroethane N/A N/A < 10 < 10 < 10 < 10 < 10 Pentachloronitrobenzene N/A 0.26 < 10* < 10* < 10* < 10* < 10* Pentachlorophenol 1 0.56 < 10* < 10* < 10* < 10* < 10* Phenacetin N/A N/A < 10 < 10 < 10 < 10 < 10 Phenanthrene N/A N/A < 10 < 10 < 10 < 10 < 10 Phenol N/A 22000 < 10 < 10 < 10 < 10 < 10 Pronamide N/A N/A < 10 < 10 < 10 < 10 < 10 Pyrene N/A 180 < 10 < 10 < 10 < 10 < 10 Pyridine N/A 37 < 10 < 10 < 10 < 10 < 10 Safrole N/A N/A < 10 < 10 < 10 < 10 < 10 beta-Naphthylamine N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethoxy)methane N/A N/A < 10 < 10 < 10 < 10 < 10 bis(2-Chloroethyl)ether N/A 0.0096 < 10* < 10* < 10* < 10* < 10* bis(2-Chloroisopropyl)ether N/A 0.26 < 10* < 10* < 10* < 10* < 10* bis(2-Ethylhexyl)phthalate 6 4.8 25.7 < 10* < 10* 8.7 1.7 n-Nitroso-di-n-propylamine N/A 0.0096 < 10* < 10* < 10* < 10* < 10* o-Toluidine N/A 0.28 < 10* < 10* < 10* < 10* < 10* p-Phenylenediamine N/A 6900 < 10 < 10 < 10 < 10 < 10 1,1,1,2-Tetrachloroethane N/A 0.41 < 10* < 10* < 10* < 2500* < 10* 1,1,1-Trichloroethane 200 3200 < 10 < 10 < 10 < 2500* < 10 1,1,2,2-Tetrachloroethane N/A 0.053 < 10* < 10* < 10* < 2500* < 10* 1,1,2-Trichloroethane 5 0.19 < 10* < 10* < 10* < 2500* < 10* 1,1-Dichloroethane N/A 800 < 10 < 10 < 10 < 2500* < 10 1,1-Dichloroethene 7 0.044 < 10* < 10* < 10* < 2500* < 10* 1,1-Dichloropropene N/A N/A < 10 < 10 < 10 < 2500 < 10 1,2,3-Trichlorobenzene N/A N/A < 10 < 10 < 10 < 2500 < 10 1,2,3-Trichloropropane N/A 0.0053 < 10* < 10* < 10* < 2500* < 10*

KN6\BWXT\FEP\02 GWAR\Table 5-14 (LF-1 Feb 2002).xls(flq102gwcdh)\5/23/2006(4:28 PM)

### Table 5-14

Landfill 1 Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc Mt. Athos Site, Lynchburg, Virginia

(Page 4 of 5)

Sample Number FL-1DUP FL-1 FL-2 FL-3 FL-4

Date Sampled 02/15/02 02/15/02 02/15/02 02/15/02 02/15/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

1,2,4-Trichlorobenzene 70 190 < 10 < 10 < 10 < 2500* < 10 1,2,4-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 2500* < 10 1,2-Dibromo-3-Chloropropane 0.2 0.047 < 10* < 10* < 10* < 2500* < 10* 1,2-Dibromoethane N/A 0.00075 < 10* < 10* < 10* < 2500* < 10* 1,2-Dichlorobenzene 600 270 < 10 < 10 < 10 < 2500* < 10 1,2-Dichloroethane 5 0.12 < 10* < 10* < 10* < 2500* < 10* 1,2-Dichloropropane 5 0.16 < 10* < 10* < 10* < 2500* < 10* 1,2-Dimethylbenzene N/A N/A < 10 < 10 < 10 < 2500 < 10 1,3,5-Trimethylbenzene N/A 12 < 10 < 10 < 10 < 2500* < 10 1,3-Dichlorobenzene 600 180 < 10 < 10 < 10 < 2500* < 10 1,3-Dichloropropane N/A N/A < 10 < 10 < 10 < 2500 < 10 1,4-Dichlorobenzene 75 0.47 < 10* < 10* < 10* < 2500* < 10* 1,4-Dioxane N/A 6.1 < 100* < 100* < 100* < 25000* < 100* 2-Butanone N/A 1900 < 10 < 10 < 10 < 2500* < 10 2-Chloro-1,3-Butadiene N/A 14 < 10 < 10 < 10 < 2500* < 10 2-Chloroethyl Vinyl Ether N/A N/A < 10 < 10 < 10 < 2500 < 10 2-Hexanone N/A 1500 < 10 < 10 < 10 < 2500* < 10 2-Propenal N/A 0.042 < 100* < 100* < 100* < 25000* < 100* 2-Propenenitrile N/A 0.037 < 100* < 100* < 100* < 25000* < 100* 4-Methyl-2-pentanone N/A 140 < 10 < 10 < 10 < 2500* < 10 Acetone N/A 610 < 10 < 10 < 10 < 2500* < 10 Acetonitrile N/A 120 < 100 < 100 < 100 < 25000* < 100 Allyl Chloride N/A N/A < 10 < 10 < 10 < 2500 < 10 Benzene 5 0.32 < 10* < 10* < 10* < 2500* < 10* Bromobenzene N/A N/A < 10 < 10 < 10 < 2500 < 10 Bromochloromethane N/A N/A < 10 < 10 < 10 < 2500 < 10 Bromodichloromethane 100 0.17 < 10* < 10* < 10* < 2500* < 10* Bromoform 100 8.5 < 10* < 10* < 10* < 2500* < 10* Bromomethane N/A 8.5 < 10* < 10* < 10* < 2500* < 10* Carbon disulfide N/A 1000 < 10 < 10 < 10 < 2500* < 10 Carbon tetrachloride 5 0.16 < 10* < 10* < 10* < 2500* < 10* Chlorobenzene 100 110 < 10 < 10 < 10 < 2500* < 10 Chloroethane N/A 3.6 < 10* < 10* < 10* < 2500* < 10* Chloroform 100 0.15 < 10* < 10* < 10* < 2500* < 10* Chloromethane N/A 2.1 < 10* < 10* < 10* < 2500* < 10* Cumene N/A 660 < 10 < 10 < 10 < 2500* < 10 Dibromochloromethane 100 0.13 < 10* < 10* < 10* < 2500* < 10* Dibromomethane N/A 61 < 10 < 10 < 10 < 2500* < 10 Dichlorodifluoromethane N/A 350 < 10 < 10 < 10 < 2500* < 10 Ethyl Cyanide N/A N/A < 100 < 100 < 100 < 25000 < 100 Ethyl Methacrylate N/A 550 < 10 < 10 < 10 < 2500* < 10 Ethylbenzene 700 3.3 < 10* < 10* < 10* < 2500* < 10* Hexachlorobutadiene N/A 0.86 < 10* < 10* < 10* < 2500* < 10* Iodomethane N/A N/A < 10 < 10 < 10 < 2500 < 10 Isobutyl Alcohol N/A 1800 < 100 < 100 < 100 < 25000* < 100 Methyl Methacrylate N/A 1400 < 10 < 10 < 10 < 2500* < 10 Methyl tert-Butyl Ether N/A 2.6 < 10* < 10* < 10* < 2500* < 10* Methylacrylonitrile N/A 1 < 100* < 100* < 100* < 25000* < 100* Methylene chloride 5 4.1 < 10* < 10* < 10* < 2500* < 10*

KN6\BWXT\FEP\02 GWAR\Table 5-14 (LF-1 Feb 2002).xls(flq102gwcdh)\5/23/2006(4:28 PM)

### Table 5-14

Landfill 1 Groundwater Monitoring Data February 2002 Sampling Event BWX Technologies, Inc Mt. Athos Site, Lynchburg, Virginia

(Page 5 of 5)

Sample Number FL-1DUP FL-1 FL-2 FL-3 FL-4

Date Sampled 02/15/02 02/15/02 02/15/02 02/15/02 02/15/02 MCL RBC Compound μg/L μg/L μg/L μg/L μg/L μg/L μg/L GROUNDWATE R

Naphthalene N/A 6.5 < 10* < 10* < 10* < 2500* < 10* Styrene 100 1600 < 10 < 10 < 10 < 2500* < 10 Tetrachloroethene 5 0.63 56.3 57.7 42.9 25400 < 10* Toluene 1000 750 < 10 < 10 < 10 < 2500* < 10 Trichloroethene 5 0.026 21.8 22.1 4.1 278 < 10* Trichlorofluoromethane N/A 1300 < 10 < 10 < 10 < 2500* < 10 Vinyl Acetate N/A 410 < 10 < 10 < 10 < 2500* < 10 Vinyl Chloride 2 0.015 < 10* < 10* < 10* < 2500* < 10* cis-1,2-Dichloroethene 70 61 33.4 33.5 < 10 < 2500* < 10 cis-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 2500* < 10* m,p-Xylenes N/A 12000 < 10 < 10 < 10 < 2500 < 10 n-Butylbenzene N/A 240 < 10 < 10 < 10 < 2500* < 10 n-Propylbenzene N/A 240 < 10 < 10 < 10 < 2500* < 10 o-Chlorotoluene N/A 120 < 10 < 10 < 10 < 2500* < 10 p-Chlorotoluene N/A N/A < 10 < 10 < 10 < 2500 < 10 p-Cymene N/A N/A < 10 < 10 < 10 < 2500 < 10 sec-Butylbenzene N/A 240 < 10 < 10 < 10 < 2500* < 10 sec-Dichloropropane N/A 0.16 < 10* < 10* < 10* < 2500* < 10* tert-Butylbenzene N/A 240 < 10 < 10 < 10 < 2500* < 10 trans-1,2-Dichloroethene 100 120 < 10 < 10 < 10 < 2500* < 10 trans-1,3-Dichloropropene N/A 0.44 < 10* < 10* < 10* < 2500* < 10* trans-1,4-Dichloro-2-Butene N/A 0.0013 < 10* < 10* < 10* < 2500* < 10*

Shading indicates result is greater than screening criteria (Use lesser value of MCL or RBC when screening). * Maximum detected level is greater than screening criteria. MCL - Maximum contaminant level. μg/L - Micrograms per liter. NA - Not available. RBC - Risk-based concentration for tap water, U.S. Environmental Protection Agency, Region 3, October 2001.

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# FIGURESKN6\BWXT\FEP\02 GWAR\Figure 3-1.doc\5/23/06(4:13 PM)FIGURE 3-1SCHEMATIC OF WATER FLOWCLOSED LOOPCOOLING(0.391 MGD)ONCE THROUGHCOOLING(0.237 MGD)FramatomeANPSANITARYUSAGEURANIUMPROCESSESPICKLING &MANUFACTURINGOPERATIONSURANIUMRECOVERYROOF DRAINSGRITBLASTINGJAMES RIVER(0.396 MGD)WATER TREATMENTPLANTRECYCLERESERVOIR &STORAGE TANKMISC. PLANTCONSUMPTIONCOOLINGTOWERSCREENEQUALIZATIONAERATIONCLARIFICATIONCLARIFICATIONUV DISINFECTIONSPLITTERBOX BWELLS0.132 MGDDI WATER PLANT0.042 MGDDRINKING WATER(NPD)0.090 MGDDRINKING WATER(Framatome ANP)0.007 MGDSILVERRECOVERYSPRINGWATERROOF &ALLEYWAYDRAINSEQUALIZATIONMICROFILTRATIONCLARIFICATIONMICROFILTRATIONNEUTRALIZATIONNEUTRALIZATIONSAND FILTEREQUALIZATIONPOND NO. 1EQUALIZATIONPOND NO. 2OUTFALL 1010.031 MGDOUTFALL 7010.161 MGDFINAL OUTFALL 0010.479 MGDOUTFALL 0050.003 MGD AVG.0.081 MGD PEAKOUTFALL 0040.020 MGD AVG.0.287 MGD PEAKBRYANT’S POND(0.017 MGD AVG0.329 MGD PEAK)0.391MGDREC.LOOPMAJOR STORMEVENTS ONLY(4.8 MGD PEAK)SPRINGWATER(0.05 MGD)NON-RADIOACTIVEROOF DRAINSRADIOACTIVEROOFDRAINSEMERG.OVERFLOWMAJOR STORMEVENTS ONLY(0.050 MGD PEAK)JAMES RIVERUNNAMEDDITCH LEADINGTO JAMES RIVERJAMES RIVERDIFFUSERONCE THROUGHCOOLING WATER(0.237 MGD)IMHOFFTANK0.049 MGDSOLIDSSOLIDSOVERFLOWNotes:1.All Flow Data is estimated fromflow data from January, 2000 throughDecember, 2000.2.All average and peak flows are totaldaily flows except for the once throughcooling water overflow to Bryant’spond, which is an estimatedinstantaneous peak rate.3.MGD = Millions Gallons per Day.EQUALIZATIONEQUALIZATIONEQUALIZATIONEQUALIZATIONTREATED GROUNDWATER FROM PUMPAND TREAT SYSTEM(.017 MGD)SETTLINGCLARIFICATIONBYPASSOUTFALL 6010.286 MGDBYPASSKN6\BWXT\FEP\02 GWAR\Fig 5-2.xls(Fig5-2)\5/23/2006(4:12 PM)Figure 5-2Fluoride Concentraiton in FEP-2 Effluent (Outfall 701)BWX Technologies, Inc.Mt. Athos Site, Lynchburg, Virginia0.010.020.030.040.050.060.070.080.090.010/28/1995 3/11/1997 7/24/1998 12/6/1999 4/19/2001 9/1/2002Date

701 Concentration (mg/l)