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• Groundwater levels observed at the former Major Mart site appear to follow the regional trends presented in Figure 6 The static water levels measured in October 1994 for wells No 77 and 71 are similar to static levels measured in several Major Mart wells in October 1994 The sounding measurements for these wells is provided in Appendix C 2.3 AREA SURFACE WATER As shown on Figure 5, the nearest surface water body of significance is the Calaveras River and its associated Diverting Canal The southern bank of the Calaveras River is north of the Site along West Lane, at a distance of approximately 3600 feet 1t is unknown if a water quality monitoring ' program is established for this River 2.3,1 Groundwater Recharge Although likely, it is unclear from the available maps and other information compiled if the Calaveras River and Diverting Canal near West Lane serves as a recharge boundary for groundwater in the northern and eastern vicinity of the Major Mart Site Closer to the Site and possibly a more significant source of shallow groundwater recharge is the downward leakage of wastewater from the local stormdrain and sanitary sewer networks SECOR contacted the City of Stockton Public Works Department and spoke to Ms Diane Arana, an Engineering Technician She was able to locate and provide maps to SECOR showing the distribution of the stormdrain and sanitary sewer lines in the Major Mart vicinity A copy of a portion of these maps is provided in Appendix C SECOR has prepared Figure 7 which delineates the stormdrain and sanitary sewer lines adjacent to the Site The ' arrows indicating the direction of wastewater flow is based on a review of manhole and flowline elevations shown on the Department's maps SECOR Intemational ane (SECOR(&) CRC Environmental Risk Management Inc N0026 001 01 add 7 November 30 1994