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1 ' Site Background Information - Ripon Farm Service • Page 8 of 9 1 CONFIRMATION SOIL AND GROUND WATER SAMPLING ' Based on analytical data collected from the SVE progression and the ground water wells, confirmation soil and ground water collected from within the area ofpetroleum hydrocarbon-impact ' at the site were required to determine if continuing remedial operation was necessary and serve to approximate remaining petroleum hydrocarbon concentrations On 14, 15,and 17 October 2003,five soil probe bonngs(CB-1 through CB-5)were advanced at the site under oversight of the San Joaquin County Environmental Health Department (EHD) Probe boring CB-1 was advanced adjacent to monitoring well MW-1, CB-2 was advanced was advanced adjacent to boring B4, boring CB-3 was advanced between vapor wells VW-I and VW-11, boring CB-4 was advanced between boring B4, vapor wells VW-3, VW-1, and air-spargmg well IAS1, while boring CB-5 was advanced adjacent to the north property boundary, between well MW-2 and ' vapor well VW-7 Probe borings were advanced to a total depth of 45 feet bsg,a grab ground water sample was collected from each boring at 40 feet to 45 feet bsg, except at CB-3 ' Soil samples were collected from the probe borings at 5-foot intervals, starting at 5 feet bsg, using a Geoprobe soil sampling device Confirmation borings CB-1,CB-2,CB-4,and CB-5 were sampled ' for ground water A Geoprobe water sampling assembly was advanced to a depth of 45 feet bsg, equipped with a pre-cleaned, 4-foot by 1-inch outside diameter, temporary well with 0 01-inch, slotted well screen was lowered to the bottom of the bore hole Each ground water sample was extracted by lowering a modified Teflon tube bailer into the screen section of the temporary wells After sample retrieval,the water samplers were disassembled and cleaned New Teflon tubing was used to collect each sample The water samples were collected in three laboratory-supplied, t 40-milliliter (ml) VOA vials containing 0 5 ml hydrochlone acid solution (18%) as sample preservative and in one l-liter amber bottle without a sample preservative Collected samples preserved for laboratory analysis were placed in a chilled container and transported under chain of ' custody Confirmation soil and grab ground water samples were analyzed for a TPH-g and TPH-d in accordance with EPA Method 8015 Modified, and ' a BTEX and the oxygenated fuel additives MTBE, TBA, DIPE, ETBE, TAME, EDB, and 1,2-DCA in accordance with EPA Method 8260 A total of thirty-six soil samples were analyzed for TPH-g,TPH-d,BTEX,and MTBE Only twenty soil samples were analyzed for the suite of five fuel additives by EPA Method 8260 Modified a TPH-d was detected in soil samples CBI-20, CB2-20, CB3-20, and CB5-20 at concentrations of 490 mg/kg, 1,300 mg/kg, 610 mg/kg, and 160 mg/kg ' a TPH-g, BTEX compounds, and fuel additives were not detected in the soil samples • ADDITIONAL GROUND WATER ASSESSMENT ' Advanced Geo Environmental,Inc