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r ■ . Former Beacon Station 494 October 8, 1996 Stockton, California Appendix B Closure Report September 1995 The groundwater pumping system was shut down because low concentrations of hydrocarbons were detected in samples collected from the groundwater morutonng wells Prior to shutting down the groundwater pumping system, the laboratory reported concentrations of TPHg and BTEX at below detection limits for two consecutive months May 1996 Groundwater monitoring was discontinued and closure requested Tables listing groundwater monitoring data from April 1992 through May 1996 are included within Appendix D SITE VICINITY WELL SURVEY A review of California Department of Water Resources (DWR) well records was conducted by Horizon Records were searched to identify wells within a 112-mile radius of the site Four wells were identified as Iocated within this radius The results of the well survey are compiled in the Well Inventory Table (Table 2) Three of the wells are situated to the west or southwest of the site Directionally, these wells are hydraulically upgradient of the site The nearest upgradient well located was 325 feet from the site One well was recorded as being located at D Street and Fremont Street The listed owner of this well, California Water Service Company, was contacted to obtain additional information on this well Mr Mike Camy of California Water Service informed Horizon that the subject well did still exist and was located approximately 240 feet east of the center of the intersection of East Fremont Street and D Street According to Mr Camy, the well is considered operational but has not been in use for several years prior to 1990 California Water Service Company also supplied Horizon a well log indicating the well is constructed of 16-diameter casing to a total depth of 242 feet bsg The perforated interval was shown as 140 to 185 feet bsg, 202 to 208 feet 1494 APB 6 HORIZON ENVIRONMENTAL INC