Rocky Mountain Arsenal CCR Basin F/Basin F Exterior Rernediation Project - Part I Rev. 0 WIBS 2.06.32.02 November 1,2005 To ensure that the Subcontractor complied with the contents oftheir QCP, thePMC dedicated a QC representative who spent the majority ofhis workday inthe field observing the execution of the work. 5.2 Summary of QA/QC Documentation Inspection forms, checklists and reports were prepared by the PMC QA/QC representatives and by the Subcontractor QC representatives to document QA/QC activities performed during the Basin FExterior - Part I and subsequent deep acute CSV removal action. The removal ofdeep, acute CSV was done under a separate subcontract from the rest oftheBasin F Exterior - Part I work. Completed documentation prepared by the PMC QA/QC representatives for allwork can be referenced in the project files and.includes the following: 0 Contractor Daily Quality Control Reports (BFE-16.2. 1) 0 Contractor Quality-Related Requirements Checklists (BFE-16.2.2) 0 Quality Control Field Log Books (BFE-11. 11.2) 0 Decontamination/Cleaning Inspection Forms (BFE-17.1) 0 QA Surveillance Reports (BFE-16.4.2) 0 Field Quality Assurance Oversight Reports (BFE- 16.3.4)

- Odor Monitoring Observation Data Sheets (BFE-21.1) 0 Preparatory Inspection Forms (BFE-16.6.1)

- Initial Inspection Forms (BFE-16.6.2) As part ofthe submittal process, the following plans were submitted by the Subcontractor for PMC review and acceptance in accordance with the QA/QC matrix and the technical specifications: 0 Odor Control Plan (BFE-1 1.5.2.2) 0 Stormwater and Erosion Control Plan (BFE-1 1.5.2.3 and 11.5.2.18) 0 Environmental Compliance and Materials Management Plan (BFE-l 1.5.2.4) 0 Dust Control Plan (BFE-1 1.5.2.5) Survey Plan (BFE-1 1.5.2.6) Haul Road and Traffic Management Plan (BFE-11. 5.2.7) 0 Contamination Control Plan (BFE-1 1.5.2.8) 0 Excavation Plan (BFE-l 1.5.2.9) 0 Quality Control Plan (BFE-11.5.2. 10 and 11.5.2.17) 0 Topsoil Removal and Stockpiling Plan (BFE-l 1.5.2.11) 0 Comprehensive Excavation Work Plan (BFE-l 1.5.2.15) Subcontractor quality control inspections and construction progress were documented on Subcontractor Daily QC Reports, weekly Stormwater and Erosion Control inspection reports,

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TETRA TECHEC, INC. 00042999 15317-3Rocky Mountain Arsenal CCR Basin F/BasinF Exterior Rernediation Project - Part I Rev. 0 WBS 2.06.32.02 November 1,2005 weekly Staging and Stockpiling Inspection Reports and Decontamination Inspection Forms. All QAJQC documentation is maintained inthe project files as shown on the File Index included as Appendix F. 5.2.1 Well Closure Eleven monitoring wells were closed in and around the Basin FExterior - Part Iproject sites. All closed wells were within NCSA-4b. Remaining wells located within, and around, the Basin F Exterior - Part 2 work area will be closed at alater date. A list ofwells that were abandoned during Basin F Exterior - Part 1ofthe project isprovided below: " WellNumber 26010 " WellNumber 26041 " WellNumber 26046 " WellNumber 26055 " WellNumber 26056 " WellNumber 26074 " Well Number 26075 " WellNumber 26132 " Well Number 26141 " WellNumber 26148 " Well Number 26149 All wells were closed by the PMC's site-wide well abandonment Subcontractor in accordance with the Consolidated Well Abandonment Project Work Plan (FWENC 2001). The PMC provided QA oversight during well abandonment and documented the inspection results on Well Abandonment Inspection Forms and Field Quality Assurance Oversight Reports. These reports are maintained inthe Well Abandonment project files. The well abandonment logs and related documentation are included inthe Site-Wide Well Abandonment Project files (file number WAB02-11.11.5). Additional information regarding the wells is contained in the Rocky Mountain Arsenal Environmental Database (PMRMA 2006). 5.2.2 Excavation Excavation and disposal ofHHE soil and biota risk soil were documented using a waste tracking system as specified inthe PMC's Site-Wide Remediation Waste Management Plan. The PMC Waste Tracking representative documented the excavation and disposal ofeach truckload of waste material using aTransport and Disposal Document, or electronically recorded the titckloadusing'a Telxon unit.-Information entered into the waste tracking system included waste type, source location and disposal destination (either Basin A or the HWL). The Waste Tracking representative also maintained a Generator Waste Tracking Log. At the end ofeach workday, the Waste Tracking representative's Waste Tracking Log was reconciled withthe actual loads received atthe disposal facilities to verify that all loads ofwaste material were accounted for and tracked to the proper disposal destination. Verification ofwaste soil,and debris removal was performed by initial and final surveys ofeach site bythe Subcontractor's gradecheckers. Quality Control survey ofthe Subcontractor's work was performed by Knight Armour, Inc.

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TETRA TECH EC. INC.'Rocky Mountain Arsenal CCR Basin F/BasinF Exterior Remediation Project - Part I Rev. 0 WBS 1*16,11*12 November 1, 2005 CSV ID Number Lab Sample ID Location ofSample Exceedance Number CSV-0585 NC-4B-28 NCSA-4b None CSV-0586 NC-4B-29 NCSA-4b None CSV-0587 NC-4B-30 NCSA-4b None CSV-0588 NC-4B-31 NCSA-4b None CSV-0600 NC-4B-32 NCSA-4b None CSV-0601 NC-4B-33 NCSA-4b None CSV-0602 NC-4B-34 NCSA-4b None CSV-0608 NC-4B-35 NCSA-4b None CSV-0609 NC4B-36 NCSA-4b None CSV-06 10 NC-4B-37 NCSA-4b None CSV-0611 NC-4B-38 NCSA-4b None CSV-0612 NC-4B-39 NCSA-4b None CSV-0613 NC-4B-40 NCSA-4b Biota CSV-0626 NC-413-41 NCSA-4b None CSV-0627 NC-4A-08 NCSA-4a None CSV-0628 NC-4B-42 NCSA-4b None CSV-0629 NC-4B-43 NCSA-4b None CSV-0674* NC-4B-44 NCSA-4b Chronic CSV-0675* NC4B-45 NCSA-4b Acute CSV-0676* NC-4B-46 NCSA4b Acute CSV-0677* NC-4B-47 NCSA-4b None CSV-0682 NC-4B-48 NCSA-4b None CSV-0683 NC4B-49 NCSA-4b None CSV-0684 NC-4B-50 NCSA-4b None CSV-0686 NC-4B-51 NCSA4b None CSV-0687 NC4B-52 NCSA-4b None CSV-0688* NC-4B-44 NCSA-4b Biota CSV-0689* NC4B-44 NCSA-4b None CSV-0690* NC4B44 NCSA4b None CSV-0691 * NC4B-44 NCSA-4b None CSV-0692 NC-413-45 NCSA-4b None CSV-0696* NC-4B-46 NCSA-4b None CSV-0700* NC4B-47 NCSA-4b None CSV-0985* NC4A-09 NCSA-4a None CSV-1094 BFEX-CSV-06 N4A-DA4 None CSV-1095 BFEX-CSV-05 N4A-DA4 None CSV-1096 BFEX-CSV-08 N4A-DA4 None CSV-1097 BFEX-CSV-07 N4A-DA4 None CSV-1098 BFEX-CSV-08 N4A-DA4 None Eleven samples were collected but were not considered Regulatory Agency confirmatory samples and therefore do not count againstthe agencies' total. A total of 18,955 bcy ofCSV was excavated at Basin F Exterior - Part 1based onthe exceedance samples, visible staining, and various belowgrade structures and debris encountered during excavation. The original signed CSV Tracking Forms are included in the project files (file number BFE 11.6). The Basin F Exterior- Part I CSV Data Summary Report (DSR)

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TErRATECH EC. INC.Rocky Mountain Arsenal CCR Basin F/Basin F Exterior Rernediation Project - Part I Rev. 0 WBS 2.06.32.02 November 1,2005 (FWENC 2003b) and the DSR for Miscellaneous Southern Tier Soils, Miscellaneous Northern Tier Soils, Existing Sanitary Landfills 1,and Basin F Exterior Part I Additional Contingent Soil Volume Confirmatory Sampling (TtEC2006) are located in the project file BFE-22.4. Soil Excavation/Volume Verification Calculations are provided as Appendix G. These calculations include the final site excavation boundaries, survey data (e.g., pre- and post excavation data), CSV sample locations, and excavated volumes including CSV. 5.2.3 Revegetation Revegetation efforts were completed at Basin FExterior - Part 1in a single phase. Traditionally, the soil would be amended prior to the application ofseed and mulch; however, since topsoil was spread over the entire project site, soil amendments were not necessary. Seeding and mulching were performed on approximately 95 acres afterremediation activities were completed. The three sites were seeded with a native perennial slender wheatgrass) by the PMC Revegetation Subcontractor, Marty Farms. The PMC provided Subcontractor management and technical/field oversight ofthe revegetation activities. Revegetation technical oversight included monitoring seedbed preparation, seed placement, the proper anchoring ofhay mulch, and ensuring the use of certified weed-free seed and hay mulch. All revegetation activities were completed on schedule. Subsequent to PMC actions, the U.S. Fish and Wildlife Service (USFWS) permanently seeded approximately 36 acres ofsites NCSA-4b and NCSA-5c. Revegetation efforts were completed at Basin F Exterior - Deep Acute in a single phase. In these areas the soil was not amended prior to seed and mulch application. Seeding and mulching were performed on 5.5 acres after remediation activities were completed. The areas were seeded with a native perennial (slender wheatgrass) by the PMC Revegetation Subcontractor, Marty Farms. Table 5.2.3-1 lists the revegetation status by SAR site for the Basin F Exterior - Part I project. Table 5.2.3-1 Revegetation Status by SAR site Seeded with Seeded with a- Permanently seeded SAR Site(s) temporary SoilAmended* locally adapted with locally adapted cover crop species native mix** NCSA-4a NA NA X .NCSA-4b NA NA X X NCSA-5c NA NA X X

Use oftopsoil eliminated the need for soil amendments during Basin F Exterior -Part 1. Approximately 36 acres permanently seeded Theprogress offinal revegetation willbe documented annually inthe Vegetation Management Plan for those cases in which final revegetation is not complete at the timethe CCR is issued. 5.2.4 Decontamination/Free Release ofEquipment As specified in the QA/QC Matrix ofthe CQAP, the PMC QC representative performed daily inspections to verify the adequacy ofthe Subcontractor's decontamination ofequipment leaving 24 BFE CCR Final Rev 0 Final - With Errata Sheets

TETRATECH EC.INC.'Rocky Mountain Arsfnal CCR Basin F/Basin F Exterior Rernediation Project - Part I Rev. 0 W13S 2.06.32.02 November 1,2005 generated atthe meeting. Thepunch list,meeting minutes, and attendance list are included in the Prefinal Inspection Report (Appendix D). 8.2 Final Inspection Meeting In accordance withthe RDIS, a final inspection meeting and site-walk were conducted on January 24, 2003. The attendance roster, meeting agenda, and meeting minutes are provided in Appendix E. The Prefinal Inspection Report was distributed atthis meeting and the prefinal punch listwas discussed. The major itemsremaining to be completed by the Subcontractor at that time included the completion ofripping activities and removal ofsite facilities (i.e., spill kit, reinforced barricade tape, sanitary facilities). Decontamination and demobilization ofthe Subcontractor's equipment was the last item ofwork. The meeting representatives concluded that the remediation had beenperformed in accordance with the approved contract documents, andthat the completion ofthe punch list items would constitute project completion. The project punch listwas updated through completion by the PMC Construction Engineer for the project, and is included in Appendix E. Inaccordance with the RDIS, a final inspection meeting and site-walk for deep acute CSV removal were conducted on December 3, 2004. This served as boththe prefinal and final inspection forthe work. The attendance roster, meeting agenda, and meeting minutes are provided in Appendix E. The major items to be completed bythe Subcontractor included Deep Acute CSV removal, Backfilling, Grading and Ripping. The meeting representatives concluded thatthe remediation had been performed in accordance withthe approved contract documents and theproject was complete. 8.3 Final Records Review In accordance with the RDIS, aproject final records reviewwas performed bythe EPA and CDPHE on May 13, 2003. The records review included the volume verification surveys, asbuilts, Professional Engineer and Licensed Surveyor certification, statements, survey logs, corrective action reports, design changes and modifications, and supporting daily and weekly QA/QC summaries. A punch list, with action items, was created for the final records from this review and is included in Appendix F. All action items on this punch list have been addressed. A final records review for the deep acute CSV removal wasperformed September 8,2005. 9.0 LONG-TERM OPERATION AND MAINTENANCE/MANAGEMENT REQUIREMENTS No long-term maintenance is required forthis project because the ROD-identified HHE soil has been removed and final confirmatory samples identified by the Regulatory Agencies inthe side walls and bottoms ofthe excavations did not identify any additional HHE soil. The human health SEC are risk-based calculations that take into consideration specified land use restrictions listed inthe Federal Facility Agreement (EPA 1989). No caps, covers, or treatment facilities are required by the ROD for this remediation project, therefore no long-term operations or maintenance isrequired. However, the property involved inthis project is subject to restrictions on land and wateruse and will be included inthe RMA-wide 5-year reviews ofremedial action. Per the design specifications, most ofthe revegetation efforts performed by the Subcontractor required the use ofapermanent seed mixture to allowredevelopment ofnative prairie

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TIETRATIECH Er-INCRocky Mountain Arsenal CCR Basin F/Basin F Exterior Rernediation Project - Part I Rev. 0 W13S 2.06.32.02 November 1,2005 grasslands. Approximately 158 acres ofproject sites have been permanently seeded by USFWS and irrigated. Because ofpotential disturbance by future projects (Basin F Exterior - Part 2 and Basin F Wastepile Remediation), theremaining sites were seeded with alocally adapted perennial grass. The project sites will be planted with apermanent seed mixture in the future when the area can be irrigated. The progress offinal revegetation will be documented annually in the Vegetation Management Plan for those cases in which final revegetation is not complete at the time the CCR is issued. 10.0 SUMMARY OF PROJECTCOSTS 10.1 Summary Table of Project Costs The project costs associated with Basin F Exterior- Part I are provided in the table below. Table 10.1-1 Project Costs

Remediation Subcontract -Envirocon, Inc. Value ofItem Contract Amount $2,484,743.46 Contract Modification - CSV Excavation $26,955.50 Contract Modification - CSV Excavation $348,163.35 Contract Modification - CSV Excavation $59,077.09 Contract Modification - Topsoil Placement (Increase depth from 0.5 foot to 1.0 foot) $192,000.00 Contract Modification - CSV Excavation and Backfill $429,780.00 ContractModification

- CSV Excavation $33,232.55 Contract Amount-Deep Acute CSV removal $100, 261.50 Subtotal $3,674,213.45 Surveying Subcontract - Knight Armour, Inc. Value ofItem Original Contract Amount $15,530.00 Contract Modification - Additional Survey Support $28,275.00 Contract Modification - Additional Survey Support $20,300.00 Contract Modification - Additional Survey Support $6,960.00 Contract Modification - Additional Survey Support $28,450.00 Contract Modification -Additional Survey Support $6,960.00 Contract Modification -Deobligation 4317.54 Subtotal $106,157.46 Revegetation - Marty Farms Value ofItem Original Contract Amount $65,829.00 Contract Modification -Deobligation -$4,086.45 Original Contract Amount - Deep Acute CSV Areas $10,212.76 Subtotal $71,955.31 Total Contract Value $3,852,326.2 EPA Oversight Costs $15,120.28 10.2 Contract Cost Increase The cost ofthis project increased by 46 percent from its original subcontract award value. The final cost oftheproject was above the original budgeted amount; however the work scope was significantly increased after the subcontract had been awarded due to design changes that increased excavation quantities, larger than expected CSV quantities and additional Agencydirected excavation, and increased backfill requirements at HHE excavations. 10.3 Comparison ofActual Cost to ROD Cost The original ROD estimated cost forthe Basin F Exterior remediation project was $32,467,932. This estimate covered the entire scope ofthe Basin F/Basin F Exterior Remediation Project,

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TETRA TECH EC,INC.M__ ý E_ -

Rocky Mountain Arsenal CCR Basin F/Basin FExterior Rernediation Project - Part I Rev. 0 W13S 2.06.32.02 November 1,2005 1999b (July 9) Site-Wide OdorMonitoringProgram Plan.Revision 0. 1996a(June) RecordofDecisionforthe On-PostOperable Unit.Final.(Volume 1). 1996b (Sept) Soil QuantityCalculation SummaryReport. PMRMA (Program Manager Rocky Mountain Arsenal) 2006 RAM EnvironmentalDatabase. 2004 (Oct 26) FiscalYear2005 Updateto theRemediationDesignand ImplementationSchedule. Rust (Rust Environmental &Infrastructure) 1995 (May 16) PondBSoil VerificationData AssessmentReport RVO (Rernediation Venture Office) 2003a (Sept) ContingentSoil Volume Procedure Samplingand AnalysisPlan. Revision 2. 2003b (June 4) FactSheet:Remedy ModificationfortheBasinFlBasinFExterior SoilRemediationProject. 2002a (Aug) ContingentSoil Volume Procedure. Revision 2. 2002b (May) ContingentSoil Volume Procedure Samplingand AnalysisPlan. Revision 1. 1998 (Sept 30) Corrective ActionManagementUnit(CAAITJ) SoilRemediation ConstructionCompletionReport.Final. TtEC (Tetra Tech EC, Inc.) 2006 (Mar 9) DataSummaryReportforMiscellaneousSouthernTierSoils, MiscellaneousNorthernTierSoils,ExistingSanitaryLandfills 1, andBasinF Exterior Part1AdditionalContingentSoil Volume

TtFW (Tetra Tech FW, Inc.) Confirmatory Sampling.
2004 (June 25) Site-WideAirandOdorMonitoring PlanforYear2004Projects withAirPathway Analysis.Revision 0. Walsh (Walsh Environmental Scientists &Engineers, Inc.) 1996 (May 13) IndependentEngineer'sClosureCertification forBasinF Structures.

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TETRATECH EC, INC.Rocky Mountain Arsenal CCR Basin'F[Basin F Exterior Remediation Project - Part I Rev. 0 WBS 2.06.32.02 November 1,2005

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TETRA TECH EC. INC.