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[SWMU B-7]

Soils: Tarrant association (gently undulating)

Known: Records indicate a fired small arms ammunition brass area, which is reported, but not confirmed, to contain live ammunition.

Previous investigations: Previous field investigations revealed weapon crates, packing, and small caliber ammunition scattered brass. A geophysical survey indicated no anomalies (Parsons ES, 1995c).

Data Needs: Analytical data (VOCs, metals, explosives) for surface soils.

Closure Activities: The field team should be observant for the possibility of UXO. The following field activities will be performed to gather data for TNRCC closure submittal of SWMU B-7.

SWMU B-7 Field Effort 1

Review historical records as described in Section 2.4.1 of the Work Plan Overview.

Sample and analyze surface soils at the three approximate locations shown on Figure B7-1 as described in Section 2.4.1 of the Work Plan Overview. Analyze each sample for VOCs, metals, and explosives (as outlined in the FSP). Compare analytical results to background levels for soils (Section 2.4.1 of the Work Plan Overview).

SWMU B-7 Field Effort 2

1. If any surface samples taken during the first field effort have constituent concentrations exceeding background levels, three soil borings will be drilled to identify vertical extent of subsurface contamination.

a) Locate, receive approval, and drill three borings at surface sample locations exceeding background concentrations as described in Section 2.4.1 of the Work Plan Overview.

b) Obtain two samples per boring at middle and total depths (surface soils were previously sampled) in accordance with Section 2.4.1 of the Work Plan Overview.

c) Collect and analyze subsurface sample for the metals, explosives, and VOCs identified in surface soils (as outlined in the FSP).

2. Water is not expected to be encountered at the SWMU. However, if water is discovered in any of the soil borings, three borings will be sampled and potentially completed as groundwater monitor wells as detailed in Section 2.4.1 of the Work Plan Overview. Sample groundwater, where present, and analyze each sample for the metals, explosives, and VOCs identified in surface soils (as outlined in the FSP).

3. Handle the IDW in accordance with the FSP.

4. Conduct surface clearance (RL33).