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Former Beacon Station No 12419 March 18,2002 Stockton California Problem Assessment Re ork/Corrective Action Plan . samples collected from soil boring SB-6 at 88 feet bsg No gasoline hydrocarbons were reported in soil samples from the other soil borings Quarterly groundwater monitoring has been performed at the site since 1994 Tabulated historical groundwater monitoring data from 1994 to 1998 are contained in Appendix A Groundwater monitoring data from 1998 to November 2001 are summarized in Table 1 5.0 SENSITIVE RECEPTOR SURVEY AND WELL SEARCH Horizon conducted a sensitive receptor survey for the area within a 2000-foot radius of the site The sensitive receptor survey included a water well search and identification of natural surface water bodies in the survey area Fidelity National Information Solutions (Fidelity) was contracted to perform a well search within one-half mile of the site Authorization to inspect California Department of Water Resources (DWR) Water Well Drillers Reports was obtained from San Joaquin County Environmental Health Division (SJCEHD) The Water Well Report is contained in Appendix B of this report and includes a map showing the position of the wells relative to the site No naturally occurring surface waters were identified within 2000 feet of the site Information obtained from the DWR, as summarized in Table 2, indicate six water wells were located within a 2,000-foot radius of the site Two wells were tentatively identified as domestic, one as industrial and three as municipal The locations of the wells are estimated from to be approximately 1580 to 2000 feet from the site Three California Water Service (CWS) municipal supply wells (map ID numbers 3, 5 and 6) are located 1780 to 2000 feet from the site The CWS supplies drinking water to the sensitive receptor survey area The municipal supply wells were drilled to 265 to 585 feet bsg and are screened below 144 feet bsg According to the CWS, well 415 (map ID #3) is iinactive because of high nitrate concentrations 419PARCAP3-02 doc 5 ProjectNo 141923 HORIZON ENVIRONMENTAL INC.