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%W 1%/ <br />Proposal No. P-3917 <br />24 May 2000 <br />Page 2 <br />• Eleven 2 -point composite soil samples of the excavation stockpiles, and <br />• Seven soil samples beneath the product pipeline. <br />The analytical laboratory analyzed all samples for ethanol by EPA Method 8260. Ethanol <br />was not detected in any of the confirmation, stockpile, or grab -ground water samples. <br />Ethanol was detected in pipeline soil sample P-7 only at a concentration of 72,000 <br />micrograms per kilogram (µg/Kg) or 72 parts per million. <br />San Joaquin County requested that additional soil and grab -ground water sampling be <br />conducted beneath the sample P-7 location under supervision of a California registered <br />geologist or engineer. <br />Scope of Work <br />To assess whether ethanol from the product pipeline has impacted soil and ground water in <br />the vicinity of sample P-7, ACG proposes to sample soil and ground water below the former <br />P-7 sample location using the GeoProbe process. Based on the UST removal results we <br />anticipate ground water will be encountered at a depth of 8 feet bgs. <br />Prior to fieldwork, ACG will obtain a soil -boring permit from San Joaquin County. ACG <br />and contact Underground Service Alert to address underground utilities in the vicinity of the <br />boring location. <br />ACG will collect two soil samples from between 3 feet bgs (depth of P-7 sample) and first <br />encountered ground water, and a grab -ground water sample after ground water is <br />encountered. An ACG professional will log the GeoProbe boring and collect soil/grab- <br />ground water sampling under supervision of a registered professional. An ACG will also <br />monitoring the breathing zone for the geoprobe crew and screen soil samples using a photo - <br />ionizing detector (PID). <br />The GeoProbe boring will be abandoned by filling the annular space with Portland cement <br />grout. ACG will coordinate with San Joaquin County to inspect grouting of the GeoProbe <br />boring. <br />Soil and grab -ground water samples will be stored and transported to the analytical <br />laboratory in a cooled ice -chest accompanied with a chain -of -custody document. The <br />analytical laboratory will analyze soil and grab -ground water samples for ethanol by EPA <br />Method 8260. <br />Project Schedule <br />ACG anticipates completing the field investigation two days after approval of this work plan <br />by San Joaquin County. ACG will complete the report within 2 weeks of receipt of <br />analytical laboratory reports. <br />s:\enviromentakurrentjobA4399 herozplant tank investi ation\4399 work plan.doc <br />, <br />ANDERSON CONSULTING GROUP <br />