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' QUARTERLY REPORT <br /> ., APACHE PLASTICS L.P. <br /> ' 2050 East Fremont Street <br /> Stockton, CA <br /> ITHIRD QUARTER 1996 <br /> EXECUTIVE SUMMARY <br /> 11 <br /> This report discusses groundwater and vapor extraction monitoring during the third quarter of 1996 at <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 81 days (1,596 hours) between July 1 and <br /> September 30, 1996, withdrawing approximately 3,852,360 cubic feet of soil vapor from the two <br /> extraction wells Approximately 691 pounds of hydrocarbons were destroyed The unit was operated <br /> and maintained by Apache Plastics personnel 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 August, were used to assess the efficiency bf the system <br /> Groundwater was monitored in August Water was present in the deep vapor extraction well and in all <br /> M� six monitoring wells A water sample was collected only from MW-5 Gasoline and other contaminants <br /> were detected , but at somewhat lower concentrations than in previous quarters <br /> Depth measurements indicate that the water table was not planar, but formed a trough trending <br /> southeast across the site at a slope of 0 0015 ft/ft The depth to groundwater averaged almost 58 feet <br /> 1 <br /> 1 1 - <br />