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File No 43991 <br /> 12 lune 2000 <br /> Page 2 <br />' The analytical laboratory analyzed all samples for ethanol by EPA Method 8260B Ethanol <br /> was not detected in any of the confirmation, stockpile,or grab-ground water samples Ethanol <br /> was detected in pipeline soil sample P-7 only at a concentration of 72,000 micrograms per <br /> kilogram (gg/Kg) or 72 parts per million Analytical results of UST/piping removal sampling <br /> are included in Table I <br />' San Joaquin County requested that additional soil and ground water sampling be conducted <br /> beneath the sample P-7 location under supervision of either a California Registered Geologist <br /> or a Licensed Engineer recognized by the state of California <br /> Field Investigation <br />' On 2 June 2000, ACG collected one grab-ground water sample and two soil samples from a <br /> single geoprobe soil boring advanced at the former P-7 sample location V&W Drilling Inc <br /> advanced the soil bonng SB-1 using the GeoProbe process to a depth of 12 feet bgs The <br /> GeoProbe dnlling ng encountered ground water at a depth of 10 5 feet bgs The ACG <br />' representative collected soil samples from the SB-1 at the depths of 6 feet and 9 feet bgs <br /> The GeoProbe dnll ng produced 4-foot continuous cores encased in plastic 15-inch diameter <br />' plastic tubing The ACG geologist observed and descnbed the soil lithology using the Unified <br /> Soils Classification System The ACG geologist collected the soil samples for chemical <br /> analysis by cutting a section of the plastic drill-core casing with a saw, and sealing the casing <br /> section with Teflon sheeting and rubber end caps <br /> The ACG geologist monitored the breathing zone for the V&W driller and screened soil <br /> samples using a photo-ionizing detector (PID) equipped with the appropriate tamp for <br />' detecting ethanol Soil samples were screened at the depths of 3, 9,and 1 l feet bgs <br /> To collect a grab-ground water sample, the V&W dnller drove a hydropunch device 4 feet <br /> below the bottom of the borehole and pulled back the device to expose 3 feet of screen <br />' between the interval of 13 to 16 feet bgs The V&W driller removed ground water from the <br /> borehole using a section of new unused flexible plastic tubing affixed with a check value at <br /> the downhole end and applied a pumping motion to provide suction The grab-ground water <br /> sample was poured into two 40-milliliter glass VOAs <br /> All samples were labeled and preserved in a cooled ice-chest A couner transported the <br /> samples to the analytical laboratory accompanied with a chain-of-custody document <br />' Geoanalytical Laboratories, Inc of Modesto, California(Geoanalytical), analyzed the soil and <br /> grab-ground water samples for ethanol by EPA Method 8260B <br />' The V&W driller properly abandoned the GeoProbe boring by filling the open borehole from <br /> the bottom with Portland cement grout using a funnel and PVC tremie pipe The San Joaquin <br /> County representative observed grouting activities <br />' Investigations Results <br /> We have attached a bonng log of GeoProbe bonng SB-1 The soil lithology encountered in <br /> SB-1 consisted of the following <br />' • Fine gravel trench backfill to a depth of 3 5 feet bgs, <br />' s lenvironmentallcurrentjobs14399 heinz plant tank invcstigationW399 report doe <br /> ANCERSON CONSULTING GROUP � �—� <br />