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 of their QCP, the PMC dedicated a

QC representative who spent the majority of his workday in the 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 F Exterior - Part I and subsequent deep acute CSV removal action. The removal of deep,

acute CSV was done under a separate subcontract from the rest of the Basin F Exterior - Part I

work. Completed documentation prepared by the PMC QA/QC representatives for all work 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-2 1. 1)

0 Preparatory Inspection Forms (BFE-16.6.1)

- Initial Inspection Forms (BFE-16.6.2)

As part of the 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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Rocky Mountain Arsenal CCR

Basin F/Basin F 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 in the 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 F Exterior - Part I project 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 a later date. A list of wells that were abandoned

during Basin F Exterior - Part 1 of the project is provided below:

" Well Number 26010

" Well Number 26041

" Well Number 26046

" Well Number 26055

" Well Number 26056

" Well Number 26074

" Well Number 26075

" Well Number 26132

" Well Number 26141

" Well Number 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 in the Well Abandonment project files. The well abandonment logs and related

documentation are included in the 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 of HHE soil and biota risk soil were documented using a waste tracking

system as specified in the PMC's Site-Wide Remediation Waste Management Plan. The PMC

Waste Tracking representative documented the excavation and disposal of each truckload of

waste material using a Transport 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 of each

workday, the Waste Tracking representative's Waste Tracking Log was reconciled with the

actual loads received at the disposal facilities to verify that all loads of waste material were

accounted for and tracked to the proper disposal destination. Verification of waste soil, and

debris removal was performed by initial and final surveys of each site by the Subcontractor's

gradecheckers. Quality Control survey of the Subcontractor's work was performed by Knight

Armour, Inc.

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TETRA TECH EC. INC.
'Rocky Mountain Arsenal CCR

Basin F/Basin F Exterior Remediation Project - Part I Rev. 0

WBS 1*16,11*12 November 1, 20 05

CSV ID Number Lab Sample ID Location of Sample 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 against the agencies' total.

A total of 18,955 bcy of CSV was excavated at Basin F Exterior - Part 1 based on the

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)

BFE CCR Final Rev 0 Final - With Errata Sheets 23

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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 (TtEC 2006) 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 F Exterior - Part 1 in a single phase. Traditionally, the soil would be amended prior to the application of seed 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 after remediation 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 of the revegetation activities. Revegetation technical oversight included monitoring seedbed preparation, seed placement, the proper anchoring of hay 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 of sites 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 Soil Amended* 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 of topsoil eliminated the need for soil amendments during Basin F Exterior - Part 1.

Approximately 36 acres permanently seeded

The progress of final 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.

5.2.4 Decontamination/Free Release of Equipment

As specified in the QA/QC Matrix of the CQAP, the PMC QC representative performed daily

inspections to verify the adequacy of the Subcontractor's decontamination of equipment leaving

24 BFE CCR Final Rev 0 Final - With Errata Sheets

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'Rocky Mountain Arsf nal CCR

Basin F/Basin F Exterior Rernediation Project - Part I Rev. 0

W13S 2.06.32.02 November 1, 2005

generated at the meeting. The punch list, meeting minutes, and attendance list are included in

the Prefinal Inspection Report (Appendix D).

8.2 Final Inspection Meeting

In accordance with the 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 at this meeting and the prefinal

punch list was discussed. The major items remaining to be completed by the Subcontractor at

that time included the completion of ripping activities and removal of site facilities (i.e., spill kit,

reinforced barricade tape, sanitary facilities). Decontamination and demobilization of the

Subcontractor's equipment was the last item of work. The meeting representatives concluded

that the remediation had been performed in accordance with the approved contract documents,

and that the completion of the punch list items would constitute project completion. The project

punch list was updated through completion by the PMC Construction Engineer for the project,

and is included in Appendix E.

In accordance with the RDIS, a final inspection meeting and site-walk for deep acute CSV

removal were conducted on December 3, 2004. This served as both the prefinal and final

inspection for the work. The attendance roster, meeting agenda, and meeting minutes are

provided in Appendix E. The major items to be completed by the Subcontractor included Deep

Acute CSV removal, Backfilling, Grading and Ripping. The meeting representatives concluded

that the remediation had been performed in accordance with the approved contract documents

and the project was complete.

8.3 Final Records Review

In accordance with the RDIS, a project final records review was performed by the 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 was performed September 8, 2005.

9.0 LONG-TERM OPERATION AND MAINTENANCE/MANAGEMENT

REQUIREMENTS

No long-term maintenance is required for this project because the ROD-identified HHE soil has

been removed and final confirmatory samples identified by the Regulatory Agencies in the side

walls and bottoms of the 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 in the 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 is required. However, the property involved in this project is subject to restrictions

on land and water use and will be included in the RMA-wide 5-year reviews of remedial action.

Per the design specifications, most of the revegetation efforts performed by the Subcontractor

required the use of a permanent seed mixture to allow redevelopment of native prairie

BFE CCR Final Rev 0 Final - With Errata Sheets 29

TIETRATIECH Er- INC
Rocky 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 of project sites have been permanently seeded by USFWS

and irrigated. Because of potential disturbance by future projects (Basin F Exterior - Part 2 and

Basin F Wastepile Remediation), the remaining sites were seeded with a locally adapted

perennial grass. The project sites will be planted with a permanent seed mixture in the future

when the area can be irrigated. The progress of final 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 PROJECT COSTS

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 of Item

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

Contract Modification - 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 of Item

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 of Item

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 of this project increased by 46 percent from its original subcontract award value. The

final cost of the project 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 of Actual Cost to ROD Cost

The original ROD estimated cost for the Basin F Exterior remediation project was $32,467,932.

This estimate covered the entire scope of the Basin F/Basin F Exterior Remediation Project,

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W13S 2.06.32.02 November 1, 2005

1999b (July 9) Site- Wide Odor Monitoring Program Plan. Revision 0.

1996a(June) Record ofDecisionfor the On-Post Operable Unit. Final. (Volume

1).

1996b (Sept) Soil Quantity Calculation Summary Report.

PMRMA (Program Manager Rocky Mountain Arsenal)

2006 RAM Environmental Database.

2004 (Oct 26) Fiscal Year 2005 Update to the Remediation Design and

Implementation Schedule.

Rust (Rust Environmental & Infrastructure)

1995 (May 16) Pond B Soil Verification Data Assessment Report

RVO (Rernediation Venture Office)

2003a (Sept) Contingent Soil Volume Procedure Sampling and Analysis Plan.

Revision 2.

2003b (June 4) Fact Sheet: Remedy Modificationfor the Basin FlBasin F Exterior

Soil Remediation Project.

2002a (Aug) Contingent Soil Volume Procedure. Revision 2.

2002b (May) Contingent Soil Volume Procedure Sampling and Analysis Plan.

Revision 1.

1998 (Sept 30) Corrective Action Management Unit (CAAITJ) Soil Remediation

Construction Completion Report. Final.

TtEC (Tetra Tech EC, Inc.)

2006 (Mar 9) Data Summary Reportfor Miscellaneous Southern Tier Soils,

Miscellaneous Northern Tier Soils, Existing Sanitary Landfills 1,

and Basin F Exterior Part 1 Additional Contingent Soil Volume

TtFW (Tetra Tech FW, Inc.) Confirmatory Sampling.

2004 (June 25) Site-Wide Air and Odor Monitoring Planfor Year 2004 Projects

with Air Pathway Analysis. Revision 0.

Walsh (Walsh Environmental Scientists & Engineers, Inc.)

1996 (May 13) Independent Engineer's Closure Certification for Basin F

Structures.

BFE CCR Final Rev 0 Final - With Errata Sheets 35

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Rocky Mountain Arsenal CCR

Basin'F[Basin F Exterior Remediation Project - Part I Rev. 0

WBS 2.06.32.02 November 1, 2005

36 BFE CCR Final Rev 0 Final - With Errata Sheets

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