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ZE Auto Repair October 7, 2003 <br /> Stockton California Results of Additional Site Investigation <br /> r <br /> Continuous-core soil samples were collected from the monitoring well MW-1 boring Soil <br /> samples were collected from the monitoring well MW-2, MW-3, and MW-4 borings at 5- <br /> foot intervals Soil samples were field screened using a photo-ionization detector (PID) <br /> Drill cuttings were stockpiled at the site on and covered by plastic sheet After completion <br /> of drilling, four discrete soil samples were collected from the drill cuttings stockpile for <br /> disposal characterization <br /> The monitoring wells were constructed utilizing 2-inch ID PVC well casing and 0 020-inch <br /> slotted well screen The monitoring-well screened intervals were set at approximately 35 to <br /> 55 feet bsg Filter pack sand, bentonite, and sanitary seals were set as shown on the boring <br /> logs <br /> The soil samples were submitted, under chain-of-custody documentation, to Kiff Analytical <br /> LLC (Kiff), a California Department of Health Services-certified (ELAP No 2236) analytical <br /> laboratory located in Davis, California Fourteen soil samples were analyzed for total <br /> petroleum hydrocarbons as diesel (TPHd) by Environmental Protection Agency (EPA) <br /> Method M8015, total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic <br /> compounds benzene toluene ethylbenzene, and xylenes (BTEX) and the fuel oxygenate <br /> methyl-t-butyl ether (MTBE) by EPA Method 8260B The four stockpile soil samples were <br /> combined into one composite sample at the laboratory and analyzed for TPHd by EPA <br /> Method M8015, TPHg and BTEX by EPA Method 8260B, and for total lead by EPA <br /> Method 6010 Soil analytical results are summarized in Table 1 Analytical reports and <br /> chain-of-custody documents are contained in Appendix D <br /> As requested by San Joaquin County in the April 28, 2003 letter (Appendix A), selected soil <br /> samples were tested for soil physical characteristics Soil samples collected at 35 feet bsg <br /> (silt), 48 feet bsg (sand), and 55 feet bsg (sandy silt) from the monitoring well boring MW-1 <br /> were tested for the soil physical characteristics dry bulk density, permeability (falling head C <br /> method utilizing ASTM D5084 permeameter), porosity, and moisture by Sierra Testing of EI <br /> Dorado Hills, California Soil samples collected at 39 and 47 feet bsg from the monitoring <br /> 1792rpt10 03 <br /> Project No 1792 12 4 HORIZON ENVIRONMENTAL INC <br />