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Circle K Store 08671 August 31, 2005 Page 4 The samples collected from each boring were monitored using a photoionization detector PID) The test procedure involved measuring approximately 30 grams from an undisturbed sod sample, and placing this sub-sample in a sealed container (zip-lock bag) The container was warmed for approximately 20 minutes (in the sun), then the head-space within was tested for total organic vapor, measured to parts per million as benzene (ppm, volume/volume) The instrument was calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55 which relates the photo-ionization potential of benzene to that of isobutylene at 100 ppm The results of field testing were noted on the boring logs Soil Analytical Results Two soil samples from each boring were selected for chemical analysis and were submitted under chain-of-custody protocol to Severn Trent Laboratories (STL) on March 29, 2005 and analyzed for total petroleum hydrocarbons calculated as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and fuel oxygenates MtBE, EtBE, TAME, TBA, DIPE, EDB, 1,2-DCA, and ethanol by EPA Method 8260 and Cam 17 metals by EPA Method 6010 Soil analytical results are presented in Table 2 and Table 3, and the certified analytical reports and chain-of-custody documentation are included in Attachment 4 MtBE and TBA were reported in the soil sample collected from SVE-1@25' at concentrations of 0 28 milligrams per kilograms (mg/kg) and 0 14 mg/kg, respectively • MtBE was reported in the soil sample from SVE-1@30' at a concentration of 2 8 mg/kg Analytical data will be formatted as EDF version 1 2f files and uploaded to the State GeoTracker database Decontamination and Investigation Derived Waste Soil cuttings generated during drilling operations were temporarily stored on-site in California State Department of Transportation (DOT)-approved 55 gallon drums pending characterization and disposal Water generated during well purging and equipment cleaning was also temporarily stored on-site in DOT-approved 55-gallon drums pending characterization for disposal A licensed disposal contractor transport the drums to an appropriate facility for disposal or treatment SVE OPERATION Pre-Test Activities Prior to initiation of field activities, SECOR verified that the San Joaquin Air Pollution Control District (SJVAPCD) did not need to provide authorization to conduct a SVE Pilot Test SECOR also prepared a site-specific Health and Safety Plan (HASP) The HASP is a requirement of the Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operation and Emergency Response" guidelines (29 CFR 1910 120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192) The HASP . was reviewed by field staff and contractors prior to beginning field operations at the site a