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Mr. Michael J. Infurna, Jr. September 27, 2001 ` Page 2 section extending from approximately 5 to 40 feet bgs (top of the water table). One two-inch diameter IAS test well will be installed with a 5-foot screen section set approximately 5 to 7 feet below the water table. Soil samples will be collected from each well boring for BTEX and TPH analyses to assess the current soil conditions in the source area. • SVE and IAS Pilot Testing - An 8-hour SVE pilot test and a 72-hour IAS pilot test will be performed. The SVE pilot test will utilize an internal combustion engine-based extraction unit. The IAS pilot test will utilize a regenerative blower or compressor. Characteristics that will be evaluated from the pilot testing data include vadose zone gas permeability, groundwater flow rate, radial influence of the sparging well, aquifer permeability and heterogeneity, and contaminant volatility and solubility. • Constant-Rate Aquifer Pumping Test — A 24-hour constant-rate aquifer pump test will be performed in a monitor well located in or near the tank pit area. The constant-rate aquifer pump test will utilize a 2- or 4-inch submersible pump for groundwater extraction and data will be logged constantly in at least four observation points using Solinst Level Loggers. Note: The aquifer testing may not be conducted if the SVE and IAS Pilot Test data indicate that those technologies are suitable for site remediation. • Treatibility Analyses -- Soil samples for treatibility analyses will be collected from two soil borings. One soil boring will be installed near the former tank pit (SVE well boring, MW- 13/13A) and the other soil boring will be installed in a location outside of the plume (near MW-6). The proposed boring locations are depicted on the attached figure. Two samples will be collected from each boring. Physicochemical and microbiological analyses will be conducted on each sample to characterize the organic content, pH, permeability, moisture content, nutrient level, and redox potential. Bench studies will be run on two samples to test for the effects of oxygen and nutrients on the stimulation of selective microbes. These tests take place over a 21-day period and involve adding various levels of nutrients or oxygen to the samples. Microbial growth is then tested at 4, 7, 11, 16, and 21 days. • Sensitive Receptor Survey—A sensitive receptor survey will be conducted to identify exposure pathways and potential human and ecological receptors. • Corrective Action Plan (,CAP,) - Following evaluation of the pilot testing, aquifer test, treatibility data, and completion of the sensitive receptor survey, AES will submit a CAP to the San Joaquin PHS-EHD. The CAP will include results of field and laboratory pilot tests, recommendations for the most cost effective remediation alternative(s), remedial activity details, implementation and scheduling detail, an estimate of the duration of the clean up time, the finalized costs for system implementation, and annual operation and maintenance costs.