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A l 1 17 Lone Patin Avenue, Suite 201 CV �� Modesto, California 95351 209-579-2221 Fax; 209-579-2225 � A S S O C I A T E S I N C j Upon completion of AS wells SP- 1 , SP-2, and SP-3, the drilling contractor will use an air compressor to test the influence of applied air to SP- I and SP-2. The air compressor will be connected to the WHC inlet valve of SP1 , using both the shallow and deep sparge well points. Compressed air will be applied, using a compressor at approximately 2 to 3 cubic feet per minute (cfin) under a pressure of 15 to 30 pounds per square inch (psi) to evaluate the air response through the surrounding formation while monitoring SP-2 and the surrounding monitoring wells. This application is intended to provide a quick "snap shot" of air sparge influence, but not intended to be a substitute for the air sparge pilot test. In the event that positive results (increase in groundwater elevation or "mounding", increase in dissolved oxygen [DO] and pressure) are observed in surrounding wells, soil and groundwater samples will be submitted to a pre-selected laboratory to conduct the ozone bench scale testing, described in subsequent sections of this Workplan. The pilot testing may be conducted for longer periods to father evaluate the DO concentrations and oxidation reduction potential (redox) in the surrounding wells. Sample Analyses Select soil samples collected during the installation of each pilot test well will be submitted under chain- of-custody procedures to a State-certified laboratory. The samples will be analyzed for TPH gasoline ranged organics (GRO, known also as TPHg) utilizing EPA Method 8015B ; BTEX and selected fuel oxygenates MTBE, ethyl tertiary butyl ether (ETBE) di-isopropyl ether (DIPE), tertiary amyl ether (TAME), tertiary butyl ether (TBA), 1 ,2-DCA, and 1 ,2-dibromoethane (EDB) utilizing EPA Method 8260B . Additionally, three soil samples will be collected for geotechnical analyses from SP- 1 at approximately 60 feet bgs (within the sandy water bearing unit), 70 feet bgs (within the clay unit), and 80 feet bgs (within the sandy water bearing unit). Each soil sample will be collected in brass sleeves or acetate sleeves, whichever method is best Suited to capture an undisturbed sample. Each sample will be analyzed for total organic carbon using the Walkley-Black method and particle size analysis using ASTM Method D422M and AST Method D4464M . The data obtained from these analyses will be useful regarding remedial design considerations. Soil Disposal Drill cuttings will be collected and stored on site in DOT-approved 55-gallon drums and will remain on- site pending proper waste profile characterization and disposition at a Sate permitted landfill or TSDF facility, Vapor Extraction Pilot Test A SVE pilot test will be conducted to evaluate the feasibility of utilizing this technology for remediation of the hydrocarbon-impacted vadose zone soil. Additionally, the pilot test data will be used to design the appropriate remediation system to treat vadose zone soils impacted with site contaminants previously discussed . The SVE pilot test will be conducted utilizing a portable equipment trailer equipped with a positive displacement blower, an air compressor, and 55-gallon drums of vapor phase granular activated carbon Workplan for Feasibility Studies — Pomier Stockton Taxi Company ATC Associates Inc. 5:...\28349\ WP for pilot Tcsting mid SCM ATC Project No. 54.28349.0001 6