Rocky Mounwin ArsenaI CCR Addendum MNTS Project Revision I WBS 2.03.13.44000 3/29/2006
1.5 Contingent Soil Volume Procedure

The CSV Procedure (RVO/PMC SOP: RVOP.009-Revision 2) was used for the implementation ofthe additional CSV removal at NCSA-8b ofthe NINTS Remediation.Project. The BAS Residual Risk Soil Concentration Verification SAP, Revision 1,was initially used to identify the soils potentially posing a risk to small birds and was used after theinitially identified soil was removed. The standard CSV Procedure SAP was used to collect the other three single point samples for analyses.
11,133 bcy ofadditional CSV were removed at site NCSA-8b for aproject total of 11,520 bcy. All CSV was disposed in the HWL. The total number ofadditional confirmatory soil samples collected atNCSA-8b was four for anew MNTS Project total of31.

0004262B 1,5206-3

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5.2 Summary ofQA/QC Documentation

5.2.2 Excavation

Table 5.2 provided below has been updated toreflect the additional CSV removed in2003 at NCSA-8b. All other quantities in the table are consistent withthe Final CCR.

Table 5.2 Miscellaneous Northern Tier Soil Remediation HumanHealth Soil BiotaSoil Priority I Demolition RODdDesign' Actuale CSVb ROD Design Actual ROD Design Debris Project Site (bcy) (bcy) (bcy) (bcy) (bcy) (bcy) (bcy) (bey) (bcy) (bcy) NCSA-8b 1,979 1,979 2,323 11,520 18,666 16,800 26,452 0 0 3,726 NPSA-4 259 259 332 0 0 0 0 0 0 0 Pistol Rage 1,200 1,200 1,457 -- 0 

## T 0 0 0 0 0 147 Total 3,438 3,438 4,112 11,520 18,666 16,800 26,452 1 0 0 3,873a.'

a. The 100 Percent Design volume (which includes a 1.6 swell factor) for demolition debris from structure is taken from the ROD. b. CSV represents additional excavation, and is not included inthe actual volume excavated. C. Design volumes are from the Miscellaneous Northern Tier,Miscellaneous Southern Tier, and Lake Sediments Remediation Project, 100% Design Package (FWENC 1998). d. ROD volumes are calculated in the Soil QuantityCalculation SummaryReport(FWENC 1996).
e. Excavation volumes are calculated in the Excavation Volume Verification Calculations (reference project file number MNTSR-8. 10, Record Drawings/Excavation Volume Verification (Calculations and Summaries)). f The final disposal location for all wastes is given in sections 1.2 and 7.3 ofthis report.

A CSV Tracking Form was used to identify, document, track, and record approvals for CSV for each ofthe NINTS Remediation Sites. Thetable provided below has been updated to reflect the additional confirmatory soil samples taken at NCSA-8b. The initial 27 samples in the table are consistent withthe Final CCR, Revision 2 (FWENC 2002).

CSV ID Lab Sample ID Location of Sample Result Number Number CSV-0001 NCSA-8b-01 NCSA-8b HHE Excavation Non-Exceedance CSV-0002 NCSA-8b-02 NCSA-8b HHE Excavation Non-Exceedance CSV-0003 NCSA-8b-03 NCSA-8b HHE Excavation Non-Exceedance CSV-0004 NCSA-8b-04 NCSA-8b HHE Excavation Exceedance CSV-0005 NCSA-8b-05 NCSA-8b HHE Excavation Non-Exceedance CSV-0006 NCSA-8b-06 NCSA-8b HHEExcavation Non-Exceedance CSV-0007 NCSA-8b-07 NCSA-8b HHEExcavation Non-Exceedance CSV-0008 NCSA-8b-08 NCSA-8b HHE Excavation Non-Exceedance CSV-OO09 NCSA-8b-09 NCSA-8b HHE Excavation Exceedance CSV-0010 NCSA-8b-10 NCSA-8b HHE Excavation Exceedance CSV-00 II NCSA-8b- II NCSA-8b HHE Excavation Exceedance CSV-0012 NCSA-8b-12 NCSA-8b HHEExcavation Non-Exceedance CSV-0013 NCSA-8b-13 NCSA-8b HHE Excavation Non-Exceedance

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CSV-0014 NCSA-8b-14 NCSA-8b HHE Excavation Non-Exceedance CSV-0015 NPSA-4-01 NPSA-4 HHE Excavation Non-Exceedance CSV-0016 NPSA-4-02 NPSA-4 HHE Excavation Non-Exceedance CSV-0017 NPSA-4-03 NPSA-4 HHE Excavation Non-Exceedance CSV-OO18 NPSA-4-04 NPSA-4 HHE Excavation Non-Exceedance CSV-OO19 NPSA-4-05 NPSA-4 HHE Excavation Non-Exceedance CSV-0020 NPSA-4-06 NPSA-4 HHE Excavation Non-Exceedance CSV-0021 NPSA-4-07 NPSA-4 HHE Excavation Non-Exceedance CSV-0022 NPSA-4-08 NPSA-4 HHE Excavation Non-Exceedance CSV-0023 NPSA-4-09 NPSA-4 HHE Excavation Non-Exceedance CSV-0024 NPSA-4-10 NPSA-4 HHE Excavation Non-Exceedance CSV-0025 NPSA-4-11 NPSA-4 HHE Excavation Non-Exceedance CSV-0145 NCSA-8b-15 NCSA-8b HHE Excavation Non-Exceedance CSV-0146 NCSA-8b-16 NCSA-8b HHEExcavation Non-Exceedance CSV-0875 NC-8B-01 NCSA-8b HHE Excavation Exceedance CSV-0878 NC-8B-02 NCSA-8b HHE Excavation Exceedance CSV-0879 NC-8B-03 NCSA-8b HHE Excavation Non-Exceedance CSV-0880 NC-8B-04 NCSA-8b HHE Excavation Non-Exceedance

As surveyed, 11,520 bey ofCSV was excavated atthe NCSA-8b Remediation Site, based on the exceedance samples. The original signed CSV Tracking Forms from 2003 action are included in theproject files (MNTSR-1 1.6.2). Specific discussion ofCSV sampling results is included in the Data Summary Report (DSR). CSV DSR Revision 0 (FWENC [2000]) documents all confirmatory samples taken during the 1999 field implementation and is located inproject file NWTSR-10.1.3.1. TheMiscellaneous Southern Tier Soils, Miscellaneous Northern Tier Soils, Existing (Sanitary) Landfills Section 1,Basin F Exterior Part I Soil Remediation Projects, Additional CSV DSR, Rev 0 (TtFW [2006]) was prepared to capture the 2003 CSV sample results. The Additional CSV DSR, Rev 0 is located in project file MNTSR-23. 1.

Backfill was placed atNCSA-8b after CSV removal by a compactor with ablade. The efforts of the compactor were augmented withhelp from the bulldozer and front-end loader. The fill was placed in loose lifts and compacted in accordance withthe Specifications. During the 2003 CSV removal action, clean soil from Borrow Area 3 was used asbackfill at siteNCSA-8b. A motor grader, front loader, and bulldozer were used toblend the excavation into the existing topography.

5.2.4 Revegetation
Revegetation efforts were completed at the MNTS sites in twophases. The first phase of revegetation was completed after the MNTS Pro ect workwas completed in 1999. The second phase occurred in 2003 after siteNCSA-8b was redisturbed to remove additional CSV. The NCSA-8b site was seeded in April of2003 with a complex locally adapted native seed mixture by the U.S. Fish and Wildlife Service.

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13.0 REFERENCES

EPA et al (U. S.Environmental Protection Agency) 2000 (April) ConstructionCompletionReportApprovalletter

FWENC (FosterWheeler Environmental Corporation) 2002 (February) Miscellaneous Northern Tier Soil Remediation Project, Construction CompletionReport.Revision 2.

2000 (February) Miscellaneous Northern Tier Soil Remediation Project, Construction CompletionReport.Revision 0.

2000 (March) Miscellaneous Northern Tier Soil Remediation Project, Construction CompletionReport.Revision 1.

2000 (March) Contingent Soil VolumeDataSummaryReport,Revision 0.

2000 (October) Biological Advisory Subcommittee Residual Risk Soil Concentraion VerificationSamplingand AnalysisPlan.Revision 1.
TtFW(Tetra Tech Foster Wheeler) 2004 (July) Miscellaneous Northern Tier Soil Remediation Project, Construction CompletionReport.Revision I Errata Pages.

2006 (March) MiscellaneousSouthern TierSoils,MiscellaneousNorthernTierSoils Existing(Sanitary) LandfillsSection 1,BasinF ExteriorPart I Soil RemediationProjects, AdditionalContingentSoil VolumeDataSummary Report,Revision 0.

RVO (Remediation Venture Office) 2004 (February) Miscellaneous Northern Tier Soil Remediation Project, Construction CompletionReport,Addendum 1.Revision 0.

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