Rocky Mountuin Arsenal CCR k) ernediation Project Revision I WBS 2.05.28.02 April 13, 2004 'ection " , i,R 5.2.3 Structures Demolition Culvert pipe, chemical sewer pipe, headwalls, and headgates were removed from NCSA-5c, NCSA-6a, NCSA-l c, and NCSA-5b. All concrete was appropriately sized andhauled to Basin A orHWL depending onthe associated soil type. Headgates located inHHE along the Sand Creek Lateral (NCSA-5c) were disposed in theHWL as was the chemical sewer pipe removed from NCSA-6a. Culvert pipe and headwalls located inBiota soil within NCSA-5b and NCSAIc were disposed in Basin A. A total of53 loads ofmiscellaneous debris were disposed inBasin A, and 23 loads ofdebris were disposed in the HWL. Disposal ofthis demolition debris was documented using thewaste tracking system as specified in the Contractor's Site-Wide Remediation Waste Management Plan. Waste tracking docuirientation is included in the project files. 5.2.4 Asbestos and Hazardous Materials Abatement There were no asbestos-containmg materials orhazardous materials discovered duringthe Section 35 Soil Remediation Project. 5.2.5 Revegetation Upon completion ofexcavation activities and backfilling at the Section 35 Soil Remediation sites the following revegetation activities were performed. Soil amendments (composted cattle manure) were delivered and spread over 59.5 acres atthe NCSA-1c, NCSA-5a,NCSA-5b, NCSA-5c, NCSA-5d, NCSA-6a, surficial blota, surficial PI, and additional surficial PIworksites. Soil amendments were placed in areas where excavations had beenbackfilled with borrow material, orwhere topsoil was notpresent. Soil amendment quality was assessed upon delivery. Soil amendments were applied to 92%of theproject site but not incorporated due to future disturbance. A figure depicting the areas that received soil amendments is included in theproject files. Planned future disturbance includes two activities. The first includes theremoval ofsoil from Borrow Area 3 thatis required priorto finalrevegetation activities. The second future activity is theregrading ofthe northeast comer of Section 35 toaccommodate drainage from Section 36 to the west through Borrow Area I Additionally, theregrading activity isintended to remove marimade features. The PMCRevegetation Subcontractor seeded a portion oftheNCSA-5b, NCSA-5c, surficial biota and sur-ficial PI sites with a locally adapted perennial gass. After seeding activities were completed, all sites were mulched with weed-free gass hay. Revegetation field oversight included monitoring seedbed pTeparation, seedplacement, andthe proper anchoring ofmulch, and ensuring theuse ofcertified, highquality seed and hay mulch. All revegetation activities were completed in accordance with design specifications following completion ofremediation activities. Some areas withinthe project boundaries willbe disturbed by workinBorrow Area 3. These areas will receive soil amendments and vegetation at a later date. Other areas were not seeded due to wet conditions inthe Spring. Theremainder ofthe project area will be revegetated after field work for South Plants is complete, currently scheduled for completion in 2005.

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00033895 11473-3AP Rocky Mountain Arsenal CCR Section 35 Soil Remediation Project Revision I WBS 2-05,28,02 April 13, 2004 Table 5.2.5-1 Revegetation Status by SAR Site SAR Site(s) Seeded with Soil Amended Seeded with a Permanently Notes temporary (Not locally seeded with cover crop Incorporated) adapted locally adapted species native mix

NCSA-1c: X NCSA-5a X Sitepartially NCSA-5b X X seeded X X Partially seeded NCSA-5c by USFWs NCSA-5d X NCSA-6a X X* Biotain SE corner ofSec 35 seeded, the remainderwas Surficial Biota X not P1 in SE corner of Sec 35 seeded, the Surficial P1 X remainder was not Additional Surficial X Pi 5.5 acres did notreceive soil amendments. Theprogress offinalrevegetation will be documented annually in the Vegetation Management Plan for those cases where final revegetation is not complete at the time the CCR is issued.

5.2.6 Decontamination/Free Release ofEquipment As specified in the QA/QC Matrix ofthe CQAP, the Contractor's QC representative performed daily inspections to verify the adequacy ofthe Subcontractor's decontamination ofequipment leaving the remediation site. These inspections are documented on Decontamination Inspection Forms, which are maintained in the project files (S35-17. I).

Prior to the release of any construction equipment aom RMA, a wet decontamination was necessary to ensure that no soil was transferred off-site. The wet decontamination took place at either the HWL or the CERCLA WWTF. Decontamination ofeach free release can be referenced in the project files.

5.2.7 UXO Oversight There was one UXO emergency response initiated during work activities as discussed in Section 4.1.8. An ER form and OE tracking form are filed in the PMC UXO Group files. These forrns

can be referenced by the tracking numbers listed below. " ER Number 121 " OE Tracking Number 1126021347

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