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QUARTERLY REPORT <br /> i� FOURTH QUARTER 1994 AND FIRST QUARTER 1995 <br /> APACHE PLASTICS L.P. <br /> 2050 East Fremont Street <br /> Stockton, CA <br /> EXECUTIVE SUMMARY <br /> This report discusses groundwater and vapor extraction monitoring <br /> and waste disposal during the 4th quarter of 1994 and 1st quarter <br /> of 1995 at the Apache Plastics manufacturing facility in Stockton, <br /> California. The report was prepared by Upgradi.ent Environmental <br /> Consultants under contracts no. 94116, 95004 , and 95016 . <br /> The VR Systems vapor extraction unit operated for a total of 6, 953 <br /> hours between October 1, 1994 and March 31, 1995, withdrawing <br /> approximately 29, 000, 000 cubic feet of soil vapor from the two <br /> extraction wells . The unit was operated and maintained by Apache <br /> Plastics personnel, and operated nearly continuously except for a <br /> week during mid-March, when it was replaced by a smaller unit. The <br /> on-board computer monitored all essential parameters except vapor <br /> concentration, which was manually monitored by Upgradient personnel <br /> on a weekly basis, using a portable photo-ionization detector <br /> These data, along with laboratory analyses of vapor samples <br /> collected in November and March, were used to assess the efficiency <br /> of the system. Based on this data, the weight of extracted VOC ' s is <br /> calculated to be slightly more than 5, 000 pounds during the two <br /> quarters . <br /> Groundwater was monitored in December 1994 and February 1995 Water <br /> was present in three of the six monitoring wells in December, <br /> yielding a groundwater gradient of 0 . 001 ft/ft to the southwest. No <br /> samples could be collected because of the limited volume of water <br /> in each well . Water was present in five of the six wells during <br /> February, and all were sampled. Gasoline and benzene were detected <br /> in one of these. Depth measurements indicate that the water table <br /> was not planar, but formed a trough trending southwest across the <br /> site. <br /> Purge water and condensate from the vapor extraction system were <br /> stored in barrels until the end of the 1st quarter. A vacuum truck <br /> was used to empty the barrels, and the fluids were transported <br /> under non-RCRA hazardous waste manifest to Petroleum Recycling <br /> Corporation' s TSD facility at the end of the quarter. <br /> . 1 <br />