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} A S S O C I A T E S I N C <br /> CLOSURE REPORT <br /> r f. <br /> Smiths Canal Pump Plant <br /> -, 2144 Fontana Avenue <br /> F Stockton, California <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. has prepared this report on behalf of the City of Stockton Public Works <br /> Department to present the information required for site closure review for the Smiths Canal Pump <br /> _ Plant at 2144 Fontana Avenue in Stockton, California (Figure 1). This report is being submitted <br /> to the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> F and the California Regional Water Quality Control Board, Central Valley Region (RWQCB) to <br /> satisfy the No Further Action (NFA) requirements, as outlined by CRWQCB (Appendix B of the <br /> Tri-Regional Recommendations). A completed checklist of data required for closure <br /> t ii-if i <br /> consideration is included as Appendix A. <br /> {i <br /> 2.0 HYDROGEOLOGIC SETTING <br /> The subject site is located at 2144 Fontana Avenue in Stockton, California (Figure 1). The site is <br /> situated at an approximate elevation of 20 feet above mean sea level, in the Great Valley <br /> geomorphic province. The Great Valley province is a north-south elongated structural trough <br /> filled with sediment from marine and continental sources. The continentally derived sedimentary deposits comprise the upper portion of the valley fill, and were deposited in fluvial, alluvial, and <br /> lacustrine environments. <br /> The closest surface water to the site is Smiths Canal, adjacent to the south end of the site. The <br /> Calaveras River is approximately one mile northwest from the site. Monitoring data collected from the <br /> site indicate groundwater is present at approximately 11 feet below ground surface (bgs) with a <br /> northerly gradient. <br /> 3.0 BACKGROUND <br /> 3 An estimated 1,100 gallons of diesel fuel was reportedly leaked from a 5,000-gallon fiberglass tank as a <br /> result of an inadvertent puncture. The tank was repaired and returned to active service. <br /> In May 1988, Ensco Environmental performed a limited investigation, advancing a single soil boring <br /> (B-1)beneath the northern (fill) side of the tank to a maximum depth of approximately 17 feet below <br /> grade. A soil sample collected from this boring at 17-17.5 feet b s recorded 130 parts per million <br /> rte:_ <br /> w:162574.02\rcporlslelosure-smith.doo 1 <br /> G;.I <br />