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' Site Background Information: Ripon Farm Service . Page 7 of 7 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 of petroleum hydrocarbon-impact ' at the site were required to determine if continuing remedial operation is necessary and serve to approximate remaining petroleum hydrocarbon concentrations. ' Post Remediation Soil Sample Collection and Grab Ground Water Sample Collection On 14, 15 and 17 October 2003, five soil probe borings (CB-1 through CB-5)were advanced at the site, under EHD oversight. Probe boring CB-1 was advanced adjacent to monitoring well MW-1, CB-2 was advanced adjacent to boring B4; boring CB-3 was advanced between vapor wells VW-1 and VW-11; boring CB-4 was advanced between boring B4, vapor wells VW-3. VW-1 and air- ' sparging well IAS1; 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 and a grab ground water sample was collected from each boring at 40 to 45 feet bsg, except at CB-3. ' Soil samples were collected-fro p the probe borings at 5-foot intervals,starting at five 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 Geoprobc water sampling assembly was advanced to a depth of 45 feet bsg, equipped with a pre-cleaned, four feet long, one inch outside diameter temporary well with ' 0.010-inch slotted well screen 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 into three laboratory-supplied, 40-m1 VOA vials containing 0.5 ml • hydrochloric acid (18%) as sample preservative and one 1-liter amber bottle without sample preservative, according to EPA methods. Collected samples preserved for laboratory analysis were ' placed in a chilled container under ice, and transported under chain of custody to a Department of Health Services (DHS)-certified laboratory for analysis. ' Confirmation grab ground water samples were analyzed for TPH-g, TPH-d, BTEX and the oxygenated fuel additives: MTBE, TBA,DIPE,ETRE, TAME, EDB and 1,2-DCA. Analytes were not detected in the grab ground water samples collected'from the terminal depth of the confirmation soil borings. 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. TPH-d was detected in soil samples CB 1-20,CB2-20,CB3-20 and CBS-20 at concentrations of 490 mg/kg, 1,300 mg/kg,610 mg/kg and 160 mg/kg,respectively. TPH-g,BTEX compounds and fuel additives were not detected in the soil ' samples. ' Advanced GeoEnvironmental,Inc.