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• The 25 foot soil sample showed an average permeability of 2 x 10-8 centimeters per second (cm/sec), an organic content of 1 8 percent(%), and a specific gravity of 2 75 The 40 foot soil sample showed an average permeability of 9 x 10"6 cm/sec, an organic content of 1 8 %, and a specific gravity of 2 73 A copy of the analytical report is included in Appendix D B. ENHANCED BIOREMEDIATION PILOT TESTING Soil samples for the treatability studies were collected from the source area(well boring VE-1) and from an unaffected area of the site (boring SB-14) Two samples were retained from well boring VE-1 at depths of 25 and 40 feet bgs These depths correlated to the highest field photo-ionization detector(PID)readings in VE-1 Two samples were retained from boring SB-14 at depths of 25 feet and 40 feet bgs No field PID readings were detected at these depths The samples were sealed in brass tubes and placed in a cooler for shipment, with chain-of-custody document, to BzoJet Innovative Remediation Technologies in Ione, California A Copy of the Enhanced Bioremediation pilot test report is included in Appendix E Physicochemical and microbiological analyses were conducted on each sample for nutrient tracking of nitrate, ammonium, ortho-phosphate, and potassium concentrations, pH, and microbial evaluations The analytical results revealed that the samples collected within the impacted and . unimpacted areas yielded very low recoveries of both heterotrophic and selective microorganisms, indicating inadequate levels of naturally occurring nutrients for acceptable bioremediation to occur Bench studies were run on the two samples collected from the source area (VE-1) to test for the effects of oxygen and nutrients on the stimulation of selective microbes The tests took place over a 21-day period and involved adding various levels of nutrients or oxygen to the samples Microbial growth was then tested at 4, 7, 14, and 21 days The bench test results indicated that both the nutrient and oxygen augmentation appear to enhance activity for the microbial population Increases in selective microbial counts (microorganisms capable of specifically degrading the target contaminant) were observed with both oxygen (76-fold increase) and nutrient (320-fold increase) augmentation C. AIR SPARGING AND SOIL VAPOR EXTRACTION PILOT TESTING Air spargmg (AS) and soil vapor extraction(SVE)pilot testing was conducted at the site during the period from February 27 to March 4, 2002 The testing was conducted to determine the feasibility of unsaturated and saturated in-situ well aeration technologies The pilot testing was performed in three stages, which consisted of AS only, SVE only, and a combined AS/SVE test Data was • collected during the pilot testing to measure flow rates, pressures/vacuums, and hydrocarbon emissions This data would be utilized to determine the effective radius of influence for the technologies, size equipment, and to assess hydrocarbon emissions treatment options III-2