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4 <br /> Mr Lawrence H Beasley Project 22 611-100 001 <br /> . July 18, 1997 <br /> Page 2 <br /> MW-7), one vapor extraction well (VEW-1), and two manometers (MP-1 and MP-2) <br /> Well locations are shown on Figures 2 and 3 <br /> Based on laboratory analyses, residual hydrocarbons were detected in soil samples <br /> collected from borings B-1, VEW-1, MP-1, and MP-2 Dissolved hydrocarbons were <br /> detected in monitoring wells MW-1 and MW-5, and in vapor extraction well VEW-1 <br /> In June 1994, a soli vapor extraction (SVE) remediation system was installed The system <br /> is comprised of a VR System internal combustion engine with catalytic converter and <br /> associated filters, controls and piping Vapor extraction wells VEW-1 and VEW-2 are <br /> manifolded to the SVE system The system was put into operation on July 1, 1994 The <br /> system has operated continuously from July 1994 to December 1996 Due to mechanical <br /> problems, the system operated intermittently during the first quarter 1997 The unit was <br /> repaired in early March 1997 and was returned to operation in mid-March 1997 <br /> WATER SUPPLY WELLS <br /> EMCON researched well locations within a 112-mile radius of the site at the State <br /> . Department of Water Resources (DWR) Information obtained at the DWR identified six <br /> water supply wells (two municipal, three industrial, and one unknown) The nearest well <br /> is a municipal well and is located approximately 500 feet west of the site The wells were <br /> installed during the 1950s and 1960s Well locations are depicted on Figure 1 and are <br /> described in Table i <br /> Based on information obtained from the City of Stockton and the California Water <br /> Service (provider of water for the City of Stockton), the municipal well has not been in <br /> service for the past 10 years In addition, the top of screen interval for municipal wells <br /> within 114 mile of the site begin at approximately 260 feet bgs and have sanitary seals <br /> that prevents migration from shallow surface water <br /> LOCAL AND REGIONAL HYDROLOGY <br /> Based on data collected at the site, the general groundwater gradient is toward the east to <br /> southeast During drilling activities, groundwater was encountered at approximately <br /> 65 feet bgs Depth to static groundwater has fluctuated between 54 and 66 feet bgs during <br /> the past eight years The surveyed elevations and the depth to groundwater measurements <br /> (see Appendix A) were used to evaluate the groundwater gradient <br /> SAC1K\2611CLOS URE-95�dms 1 <br />