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QUARTERLY REPORT <br /> APACHE PLASTICS L.P. <br />' 2050 East Fremont Street <br /> Stockton, CA <br />' FIRST QUARTER 1996 <br />' EXECUTIVE SUMMARY <br /> This report discusses groundwater and vapor extraction monitoring during the first quarter of 1996 at <br /> I <br />' the Apache Plastics manufacturing facility in Stockton, California The report was prepared by <br /> Upgradient Environmental Consultants under contract no 96004 <br />' The VR Systems vapor extraction unit operated for a total of 1,738 hours between January 1 and <br /> March 31, 1996, withdrawing approximately 4,608,404 cubic feet (1180 pounds) of soil vapor from <br /> the two extraction wells The unit was operated and maintained by Apache Plastics personnel It <br />' operated for 81 days during the quarter The unit's on-board computer monitored all essential <br /> parameters except vapor concentration, which was manually monitored by Upgradient personnel on a <br /> weekly basis, using a portable photo-ionization detector These data, along with laboratory analysis of <br />' a vapor sample collected in January,were used to assess the efficiency of the system <br /> Groundwater was monitored to February Water was present in all six monitoring wells Samples were <br /> collected only from MW-5 and VE-1, in accord with prior approval by PHSIEHD Gasoline and other <br /> contaminants were detected in both samples Depth measurements indicate that the water table was not <br /> planar, but formed a trough trending southeast across the site at a slope of 0 0015 ft/ft The depth to <br /> groundwater averaged 58 5 feet As in previous quarters, the depth recorded in VE-1 is spurious and <br /> was not used in constructing the gradient map <br /> 1 I <br /> t <br /> 1 <br /> 1 ` <br />