twin cities army ammunition plant 2007 remedial actions at tcaap site c...

Twin Cities Army Ammunition Twin Cities Army Ammunition PlantPlant

2007 Remedial Actions at TCAAP

Site C Excavation/Stabilization/Disposal of Contaminated Soils, Placement of Soil Covers, and Construction of Replacement

WetlandU.S. Army Corps of Engineers

Shaw Environmental, Inc.

Site C-2 Remedial ActionSite C-2 Remedial Action

Work Plan Clarification (WPC) No. 41 – Borrow soils sampling and excavation plan.

Construction Start Date – 7/16/07. Excavation/Stabilization/Disposal of contaminated soils from

63 grids at Site C-2. Placement of approximately 38,000 cubic yards (cy) of fill

material and 5,000 cy of topsoil for the soil cover construction (58 Grids and portions of the ditches required a minimum of 4 feet of soil cover due to contamination remaining in place).

WPC No. 42 – Over-excavated soils. Construction of a Replacement Wetland located north of Site

C-2 (~2 acres).

Site C-2 Remedial ActionSite C-2 Remedial Action

WPC No. 43 – Burn Area.

Excavation/Stabilization/Disposal of ~200 cy of contaminated soil at the southern end of the wetland.

Final Survey

Construction Completion Date - 10/5/07.

Site C-2Site C-2

Pre-Excavation

Site CSite C

Site C-2 Excavation of Contaminated Soils

Site CSite C

Site C-2 Excavation of Contaminated Soils and Verification of Elevation

Site CSite C

Site C-2 Stabilization of Contaminated Soils

Site C-2Site C-2

Site C-2 Load Out of Contaminated Soils

Site C-2Site C-2

Site C-2 Grading

Site C-2Site C-2

Site C-2 Final Grade

Site C Replacement WetlandSite C Replacement Wetland

Clearing and Grubbing


Excavation of soils from Wetland Area


Installing the Swale and Placing Rock


Removal of the Existing Weir


Burn Area


Burn Area Sampling


Wetland Final Grade

TCAAP OspreyTCAAP Osprey

twin cities army ammunition plant 2007 remedial actions at tcaap site c...

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