[Home] 

Investigations at several low, medium, and high priority SWMUs at CSSA are currently taking place as described in Section 1 through 5 under two delivery orders (RL17 and RL33) for contract F11623-94-D-0024. Units addressed previous to this amendment (under RL17 and RL33, in Sections 1 through 5 of this document) are listed in Table 6.1.

This second amendment to the work plan describes investigations and closure activities, as well as additional actions which will be taken at four high priority SWMUs (B-10, B-11, Bldg. 43, and I-1) and one medium priority SWMU (B-9). The locations of these sites are shown in Figure 6.1. A brief description of each of the sites addressed in this amendment is provided in Table 6.2.

This document was prepared by Parsons Engineering Science (Parsons ES) for CSSA under the U.S. Air Force Air Mobility Command (HQ AMC) Contract F11623-94-D-0024, delivery order RL53, dated September 30, 1997. This section is the second amendment to the work plan. It describes the scope of investigation and closure activities at the additional SWMUs.

6.1 - Description of RL53 Study

6.1.1   Purpose

The objectives of the work at the five SWMUs (B-9, B-10, B-11, Bldg.-43, and I-1) are similar to the objectives listed in Section 1. In short, the overall objectives are to collect sufficient data to determine if each of these sites can be closed; and if they can, to close them. The closure potential of each SWMU will be assessed with regards to closure standards of 30 TAC 335 Subchapter S. Then, if the SWMUs meet RRS1 closure requirements, an effort will be made to obtain certified closure from the TNRCC. In addition, preliminary screening of suitable treatment technologies will be provided for each SWMU which requires remedial action to meet closure standards. A detailed description of the closure standards and their associated requirements is provided in Section 2.2.

6.1.2   Scope of Work

This amendment describes the following tasks:

6.2 - Rationale and Methodology

The following sections describe the rationale and methodology of the additional field actions at sites I-1, B-9, B-10, B-11, and Bldg 43.

Sections 2.3.1 through 2.3.10 include a general description of the field investigation. Field activities not described in Section 2, including wipe sampling, have been added below.

6.2.1   Field Efforts

The field efforts to be conducted at the five sites addressed in this amendment are summarized in Table 6.3.

6.2.2   Field Sampling

The procedures for field sampling will follow those described in Section 2 and the SAP (Parsons ES, 1996a). Media to be sampled include those listed in Table 6.4.

The number of samples to be collected at each site is described in the site by site descriptions. Sample collection and handling techniques will follow the Sampling Analysis Plan (SAP) for SWMU Closures at Camp Stanley Storage Activity (Parsons ES, 1996a). Analytical techniques will follow procedures described in Test Methods for Evaluating Solid Waste, U.S. Environmental Protection Agency, SW-846 and the HQ AFCEE QAPP (AFCEE, 1997).

As described in the SAP, four types of field QC samples will be collected during the investigative effort. QC samples to be collected include equipment blanks, field duplicate samples, trip blanks, and MS/MSD samples. Sample descriptions, identifications, and frequencies required are described in detail in the SAP (Parsons ES, 1996a).

6.2.3   Soil/Rock Borings

Soil borings will be drilled at sites B-9, B-10, B-11, Bldg. 43 and I-1. The number and locations of borings planned for these sites are shown in the site-by-site descriptions. Total boring depth will be at least 5 feet deeper than the deepest extent of known waste management activities. Based on known information at these sites, depths are not expected to exceed 20 feet.

6.2.4   Wipe Sampling

One wipe sample will be collected from either the incinerator unit or the incinerator stack. This sample will be analyzed for dioxins. A second wipe sample will be collected from the floor in the approximate location that the transformers were stored. This sample will be analyzed for PCBs. Due to cost constraints, no corresponding QA/QC samples will be collected for PCBs or dioxins.

A wipe sample is collected by establishing a known area that will provide sufficient loading without exceeding the absorptive capacity of the wipe material. As a general practice, a 10 centimeter (cm) by 10 cm area is evaluated as a discrete sample.

6.3 - Solid Waste Management Closure Activities

Additional activities will be carried out at the SWMUs shown in Figure 6.1. No low priority SWMUs will be addressed as part of this additional work. Work in addition to that described in Sections 1 through 5 will be carried out at SWMU B-9, B-10, I-1, and Building 43. Work will also be conducted at B-11. All data collection activities will follow appropriate procedures noted in the SAP. Known information and expected activities at these units are summarized in the site by site descriptions.

The field activities described in Section 2.4.1, with the exception of reviewing historical records, conducting geophysical surveys, and conducting soil gas surveys, will be carried out during the additional investigations. In addition, wipe sampling will be carried out at SWMU I-1. These additional activities are briefly described in the individual site descriptions. A thorough description of the wipe sampling activity is included in the amended field sampling plan. Health and safety considerations associated with the RL53 work are addressed in the amendment to the project Health and Safety Plan.

[Next Section]