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Site Background Information - Ripon Farm Service <br /> Page 8of10 <br /> CONFIRMATION SOIL AND GROUND WATER SAMPLING <br /> Based on analytical data collected from the SVE progression and the ground water wells, <br /> confirmation soil and ground water collected from within the area ofpetroleum hydrocarbon-impact <br /> at the site were required to determine if continuing remedial operation was necessary and serve to <br /> approximate remaining petroleum hydrocarbon concentrations. <br /> On 14, 15,and 17 October 2003,five soil probe borings(CB-L'through CB-5)were advanced at the <br /> site under oversight of the San Joaquin County Environmental Health Department (EHD). Probe <br /> boring CB-1 was advanced adjacent to monitoring well MW-1, CB-2 was advanced was advanced <br /> adjacent to boring B4,boring CB-3 was advanced between vapor wells VW-1 and VW-11,boring <br /> CB-4 was advanced between boring B4, vapor wells VW-3 `VW-1, and air-sparging well IAS1, <br /> while boring CB-5 was advanced adjacent to the north property boundary,between well MW-2 and <br /> vapor well VW-7.Probe borings were advanced to a total depth of 45 feet bsg; a grab ground water <br /> sample was collected from each boring at 40 feet to 45 feet bsg, except at CB-3. <br /> ;F <br /> Soil samples were collected from the probe borings at 5-foot intervals, starting at 5 feet bsg,using <br /> a Geoprobe soil sampling device.Confirmation borings CB-1;CB-2 CB-4,and CB-5 were sampled <br /> for ground water. A Geoprobe water sampling assembly was!advanced to a depth of 45 feet bsg. <br /> Collected samples preserved for laboratory analysis were j placed in a chilled container and <br /> transported under chain of custody.Confirmation soil and grab ground water samples were analyzed <br /> +, for: <br /> TPH-g and TPH-d in accordance with EPA Method 8015 Modified; and <br /> • BTEX and the oxygenated fuel additives MTBE, TBA, DIPE, ETBE, TAME, EDB, and <br /> 1,2-DCA in accordance with EPA Method 8260. i <br /> 3 <br /> 4 <br /> I 'g - <br /> A total of thirty-six soil samples were analyzed for TPH-g,TPH-d,BTEX,and MTBE.Only twenty <br /> soil samples were analyzed for the suite of five fuel additives by EPA Method 8260 Modified. <br /> • TPH-d was detected in soil samples CB1-20, CB2-20, C133-20, and CB5-20 at <br /> concentrations of 490 mg/kg, 1,300 mg/kg, 610 mg/kg, and�160 mg/kg. <br /> S TPH-g, BTEX compounds, and fuel additives were not detected in the soil samples. . <br /> i <br /> t <br /> Advanced GeoEnvironmental,Inc. { <br /> l <br />