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analyzed by Sequoia Analytical-Sacramento, a DOHS Certified analytical laboratory The <br /> 1 25 samples selected by the EHS representative were analyzed for BTEX and other <br /> petroleum products <br /> 1.2 2 Monitoring Well Construction <br /> Woodward Drilling Company, of Rio Vista, CA , a Licensed C-57 drilling contractor using <br /> an eight inch hollow stem flight auger truck mounted drilling rig drilled to 62 FT and <br /> installed a two inch PVC monitoring well, MW-1 San Joaquin County EHS Permit <br /> ' SR0024759 <br /> 1 The monitoring well was purged and developed with sampling of groundwater on <br /> December 21, 2000 Reference Figure 9, "Well Development Record" The well installation <br /> was inspected by the EHS representative Water samples were collected from encountered <br /> groundwater at about 50 FT bgs No water was found in a "perched zone" at about 25 FT bgs , <br /> as earlier anticipated Groundwater was analyzed for hydrocarbon contamination MTBE and <br /> ' other oxygenates were not tested as earlier findings were non-detect and the source of the <br /> suspect petroleum hydrocarbon was not a recently formulated motor fuel It was agreed <br /> contamination did not occur within recent years and there was no need to further test for the <br /> oxygenates <br /> 1 The semi-permanent monitoring well is expected to be monitored quarterly for at least <br /> one year or the full hydrological cycle <br /> Additionally, as the monitoring well was constructed, 11 soil samples were collected using <br /> a split spoon sampler and field classified as the monitoring well was advanced Samples <br /> were transported to Sequoia Analytical for testing of 5 specific soil samples identified by <br /> the EHS representative <br /> 1 1.3 Site Contamination Findings Update <br /> The Appendix E, "LIMITED SOIL AND GROUNDWATER INVESTIGATION REPORT for <br /> r19256 N HIGHWAY 99, ACAMPO, CALIFORNIA" reflecting findings and the deductions <br /> of Rafael L Gallardo, R G No 6834 was completed May 24, 1999 Information found in <br /> the report provided a limited definition of the petroleum hydrocarbon contamination Soil <br /> with pollutant levels up to 30,000 mg/kg of diesel range and 18,000 mg/kg of kerosene <br /> 1-3 <br /> 1 <br />