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1 <br /> QUARTERLY REPORT <br /> APACHE PLASTICS L.P. <br />' 2050 East Fremont Street <br /> Stockton,CA <br /> SECOND QUARTER 1996 <br /> EXECUTIVE SUMMARY <br /> This report discusses groundwater and vapor extraction monitoring during the second quarter of 1996 <br />' at the Apache Plastics manufacturing facility in Stockton, California The'report was prepared by <br /> Upgradient Environmental Consultants under contract no 96004 <br /> 1f The VR Systems vapor extraction unit operated for 78 days (1,498 hours) between April 1 and June <br /> 30, 1996, withdrawing approximately 3,430,200 cubic feet of soil vapor from the two extraction wells <br /> Approximately 1224 pounds of hydrocarbons were destroyed The unit was operated and maintained <br /> by Apache Plastics personnel The unit's on-board computer monitored all essential parameters except <br /> vapor concentration, which was manually monitored by Upgradient personnel on a weekly basis, using <br /> a portable photo-ionization detector These data, along with laboratory analysis of a vapor sample <br />' collected in May, were used to assess the efficiency of the system <br /> Groundwater was monitored in May Water was present in the deep vapor extraction well and in all six <br /> 10 monitoring wells, and all were sampled Gasoline and other contaminants were detected in samples <br /> from MW-3,MW-5, and VE-1 Contaminants had not previously been detected in MW-3, so with the <br /> approval of Apache Plastics, the well was re-sampled on June 21, and no contaminants were detected <br /> in that sample <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 55 feet As in <br /> previous quarters, the depth recorded in VE-1 is spurious and was not used in constructing the <br />' gradient map <br /> 1 <br /> 1 <br /> r <br />