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I <br /> Advanced <br /> GeoEnvironmentai Inc . �. _. <br /> 26 July 2011 <br /> AGE-NC Project No. 95-0137 y �"y <br /> Ms. Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Well Destruction Work Plan <br /> RIPON FARM SERVICE <br /> 932 East Frontage Road, South Highway 99, Ripon, California <br /> Dear Ms. McCartney: 9 <br /> f <br /> On behalf of RFS Land (Ripon Farm Service), Advanced Geb.Environmental, Inc. (AGE) <br /> has prepared this work plan for the destruction of four on-site; two off-site ground water <br /> monitoring wells and on-site remediation wells at 932 East Frontage Road, South Highway <br /> 99, Ripon, California(site). The location of the site is illustrated in Figure 1. Locations of <br /> structures, borings and monitoring wells related to the site are`illustrated in Figure 2. <br /> 1! 9 <br /> On 14, 15 and 1,7 October 2003, five soil probe borings (CB-1 through CB-5) were <br /> advanced at the site. Probe boring CB-1 was advanced aidjacent to monitoring well MW-1; <br /> CB-2 was advanced adjacent to boring 154; boring CB-3 was', advanced between vapor <br /> wells VW-1 and VW-11; boring CB-4 was advanced between baring B4,vapor wells VW-3, . <br /> VW-1 and air-sparging well IAS1; and boring CB-5 was advanced adjacent to the north <br /> property boundary, between well MW-2 and vapor well VW-7. Probe borings were <br /> advanced to a total depth of 45 feet bsg; a grab ground water sample was collected from <br /> each boring at 40 feet to 45 feet bsg, except at CB-3. <br /> Soil samples were collected from the probe borings at 5-foot.'intervals, starting at 5 feet <br /> below surface grade (bsg), using a Geoprobe soil sampling device. Confirmation borings <br /> CB-1, CB-2, CB-4, and CB-5 were sampled for grounl6 wager. A total of thirty-six soil <br /> samples were analyzed for total petroleum hydrocarbons quantified as gasoline, diesel <br /> (TPH-g, TPH-d) Benzene, toluene, ethylbenzene, total xylene (BTEX), and Methyl tertiary <br /> butyl ether(MTBE). Twenty soil samples were analyzed:'for the suite of five fuel additives <br /> by EPA Method 8260 Modified. The following is a brief sumfmary of analytical results: <br /> TPH-d were detected in soil samples CBI-20, CB2-20, .CB3-20, and C135-20 at <br /> concentrations of 490 mg/kg, 1,300 mg/kg, 610 mg/kg; and ;'160 mg/kg. TPH-g, BTEX <br /> compounds, and fuel additives were not detected in the'soil samples. Analytes were not <br /> a detected in deep grab ground water samples CB1, CB2, . and CB5, collected from the <br /> terminal depth of the confirmation soil borings.The hydrocarbon impact to appears to have <br /> been appropriately mitigated.Site background informatio-n is provided in AGE prepared No <br /> F FurtherAction Request (NFAR), dated 10 November 2009. <br /> .i <br /> 937 Shari Road • Stockton,CA 95215 <br /> Telephone (209)467-1006 • Fax (209)407-1118 <br /> i <br />