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Area of Concern 67

RFI Work Plan Addendum

Soils: Tarrant Association (rolling).

Known: The area consists of a concrete pad that was under a 1250-gallon above ground storage tank and an adjacent ditch, east of Building 90-1 (bluing shop). The tank was used to hold rinsate from floor cleaning activities and when the tank was full, the contents were taken to the oxidation pond (SWMU O-1). The tank was removed sometime around 1997.

Previous Investigations: None.

Data Needs: Map and analytical data (VOCs and metals) for surface soils.

Rationale for Analytical Program: Based on prior usage at the site as a concrete pad and ditch near the bluing shop (Building 90-1), chemicals of potential concern include VOCs and metals. Metals (arsenic, barium, cadmium, chromium, copper, lead, mercury, nickel, and zinc) are included due to the potential metallic content of the waste. VOCs analyses are included in the analytical program to detect typical contaminants associated with a bluing operation. Explosives are not included at this site since no evidence of ammunition has been found.

Closure Activities: The following activities constitute an initial investigation of the area of concern 67. This work will be completed as part of the requirements under the RCRA 3008(h) Order, but it is not currently included in any delivery order.

  1. Field map AOC 67 as described in Section 2.4.1 of the Work Plan Overview.

  2. Find the lowest point in the concrete pad and core through the concrete. Collect one soil sample and analyze for VOCs and metals.

  3. In addition, complete two soil borings to characterize the subsurface soils in the ditch. Three soil samples will be collected from each boring; one at the surface, one at the middle of the boring and one at the total depth. The total depth of each boring will be approximately 4 feet or until 2 feet is drilled into the bedrock. Each sample will be analyzed for VOCs and metals. QA/QC samples will be collected as described in Section 2.4 of the FSP.

  4. Water is not expected to be encountered in the borings at the site. However, if water is discovered in any of the soil borings, all borings will be sampled and may be completed as groundwater monitoring wells as detailed in Section 2.4.1 of the Work Plan Overview. Groundwater will be sampled, where present, and each sample will be analyzed for VOCs and metals. QA/QC samples will be collected as described in Section 2.4 of the FSP.

  5. Handle IDW as specified in the FSP.

  6. If the results of the above work indicate that the site can be closed under RRS1 without any further investigation and/or remediation, a technical/closure report will be prepared and submitted in accordance with TNRCC closure requirements. If the site does not meet RRS1 requirements, a technical report describing the results of the investigation and recommended additional investigation and/or remediation will be prepared.