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 and hauled to Basin

A or HWL depending on the associated soil type. Headgates located in HHE along the Sand

Creek Lateral (NCSA-5c) were disposed in the HWL as was the chemical sewer pipe removed

from NCSA-6a. Culvert pipe and headwalls located in Biota soil within NCSA-5b and NCSAI c were disposed in Basin A. A total of 53 loads of miscellaneous debris were disposed in Basin

A, and 23 loads of debris were disposed in the HWL. Disposal of this demolition debris was

documented using the waste 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 -contain mg materials or hazardous materials discovered during the

Section 35 Soil Remediation Project.

5.2.5 Revegetation

Upon completion of excavation 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 at the

NCSA-1c, NCSA-5a, NCSA-5b, NCSA-5c, NCSA-5d, NCSA-6a, surficial blota, surficial P I,

and additional surficial P I worksites. Soil amendments were placed in areas where excavations

had been backfilled with borrow material, or where topsoil was not present.

Soil amendment quality was assessed upon delivery. Soil amendments were applied to 92% of

the project site but not incorporated due to future disturbance. A figure depicting the areas that

received soil amendments is included in the project files. Planned future disturbance includes

two activities. The first includes the removal of soil from Borrow Area 3 that is required prior to

final revegetation activities. The second future activity is the regrading of the northeast comer of

Section 35 toaccommodate drainage from Section 36 to the west through Borrow Area I

Additionally, the regrading activity is intended to remove marimade features.

The PMC Revegetation Subcontractor seeded a portion of the NCSA-5b, NCSA-5c, surficial

biota and sur-ficial P I 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, seed placement, and the

proper anchoring of mulch, and ensuring the use of certified, high quality seed and hay mulch.

All revegetation activities were completed in accordance with design specifications following

completion of remediation activities.

Some areas within the project boundaries will be disturbed by work in Borrow Area 3. These

areas will receive soil amendments and vegetation at a later date. Other areas were not seeded

due to wet conditions in the Spring. The remainder of the project area will be revegetated after

field work for South Plants is complete, currently scheduled for completion in 2005.

0 1 52003-CCR-See 35 REV 1.doc III IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 111 31

00033895 11473-3
AP

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

Site partially

NCSA-5b X X seeded

X X Partially seeded

NCSA-5c by USFWs

NCSA-5d X

NCSA-6a X

X* Biota in SE corner

of Sec 35 seeded,

the remainder was

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 not receive soil amendments.

The progress of final revegetation 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 of Equipment

As specified in the QA/QC Matrix of the CQAP, the Contractor's QC representative performed

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

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 of each 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

32 0152003-CCR-Sec 35 REV Ldoc