AOC 44 RFI Work Plan

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Area of Concern 44

RFI Work Plan Addendum

Soils: Krum Complex.

Known: The site is approximately 0.1 acres in size and consists of surficial metal debris. It is located north of SWMU B-9 in the East Pasture, along the west slope of a hill. This area is surrounded by AOC 51.

Previous Investigations: Site was located during field efforts under Order 126 on 22 February 1996. The site boundaries and features were surveyed on 6 March 1996 and an anomaly was observed during geophysical survey activities. The anomaly was caused by a large concentration of metal at the surface.

On 7 March 1996, two 20 lb. fragment bombs were located, flagged and removed by UXB personnel. Only one anomaly was identified during a 14 and 15 March 1996 geophysical survey of the site, but this anomaly was caused by a deer feeder, not waste.

On March 14, 1996 three surface soil samples were collected and analyzed for VOCs, SVOCs, explosives and metals. These samples were originally to be collected at SWMU B-9. The results of the surface soils indicate that only one sample contained copper above background levels for the Krum Complex soils.

On September 5, 1996 one soil boring was advanced and two soil samples were collected (3 and 7 feet below ground surface). No water was observed in the boring. Results indicate copper levels below background levels for the Krum Complex soils.

Data Needs: Map and analytical data (explosives and metals) for surface and subsurface soils. (Former data will not be used and considered questionable due to ITS Laboratory practices).

Rationale for Analytical Program: Based on surficial metal debris and previous investigations, chemicals of potential concern include VOCs, metals and explosives. Metals (arsenic, barium, cadmium, chromium, copper, lead, mercury, nickel and zinc) are included due to the metallic nature of the waste. Ammunition may include explosives residue therefore, an analysis for explosives will be conducted.

Closure Activities: The following activities constitute an initial investigation of the area of concern 44. 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 orders.

	Remove any vegetation necessary to complete field activities listed below. If suspected UXO is observed during field activities, work will cease until UXO specialists are brought on site to identify and remove UXO.
	Collect three grab surface soil samples. The samples will be biased toward any metal seen on the surface and the anomaly found during the first geophysical survey efforts. (This anomaly was caused by a large amount of surface metal). Each sample will be analyzed for explosives and metals. QA/QC samples will be collected as described in Section 2.4 of the FSP.
	If surface soil samples show contamination above background levels, complete three soil borings to characterize the subsurface soils surrounding the area. 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 10 feet or until 2 feet is drilled into the bedrock. Each sample will be analyzed for explosives and metals. QA/QC samples will be collected as described in Section 2.4 of the FSP.
	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 explosives and metals. QA/QC samples will be collected as described in Section 2.4 of the FSP.
	IDW will be handled as specified in the FSP.
	Remove any surface metal and dispose of properly.
	If the results of the above work indicate that the site can be closed under RRS1 without any further investigations 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.