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IPilot Test/TreatibdityAnalysis Proposal Former Canteen Corporation Property 1500 Shaw Road Stockton, California I Applied Earth Sciences, Inc (AES) has prepared this proposal for the performance of a soil vapor extraction (SVE) / in-situ air sparging (IAS) pilot study, aquifer pumping test, and treatibility analysis at the referenced site As part of the Problem Assessment Report (PAR), AES evaluated fourteen remediation technologies according to their performance, reliability, and applicability to the site-specific conditions Three of the fourteen technologies screened were deemed feasible for remediation of both the impacted soil and groundwater at the site These technologies included In- Sxtu Air Sparging, In-Situ Well Aeration, and Enhanced Bioremediation AES also recommends that a sensitive receptor survey be conducted to identify exposure pathways and any potential human and ecological receptors I 1.0. SCOPE OF WORK The scope of work includes the performance of an 8-hour SVE pilot test, a 72-hour IAS pilot test, a 24-hour aquifer pumping test, and collection of soil and groundwater samples for treatibility analyses The pilot tests/treatibility analysts will be used to determine the most cost-effective remediation alternative(s) for the Canteen Facility Following evaluation of the pilot test/treatibility data, an estimate of the duration of the clean up time can be provided and the costs for system implementation and operation and maintenance can be finalized Three wells will be installed in the vicinity of the former tankpit for the SVE/1AS pilot testing One two-inch diameter VES monitor point well will be installed in the vadose zone with a screen section extending from approximately 10 to 40 feet below ground surface (bgs) One four-inch diameter VES test well will be installed in the vadose zone with a screen 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 Samples will be collected from one of the borings for BTEX and TPH analyses to assess the current concentrations in the source area Additional samples will be collected from this boring for treatibility analyses ' Characteristics that will be evaluated from the pilot testing data include vadose zone gas permeability, groundwater flow rate, radial influence of the spargmg well, aquifer permeability and heterogeneities, and contaminant volatility and solubility Characteristics that will be evaluated from Ithe treatibility data include organic content, pH, permeability, moisture content, nutrient level, and redox potential ' Additionally, AES proposes to conduct a sensitive receptor survey to identify exposure pathways • and potential human and ecological receptors I 1