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v o <br /> . A S S O C I A T E S I N C <br /> Closure Report <br /> ' Chapin Brothers Investments, Inc <br /> 1766 Monte Diablo Avenue <br /> Stockton, California <br /> ATC Project No 54 27142 0001 <br /> 10 INTRODUCTION <br /> ' ATC Associates Inc has prepared this report on behalf of Chapin Brothers Investments, Inc to <br /> present the information required for site closure review for the property located at 1766 Monte <br /> Diablo Avenue, Stockton, California (Figure 1) This report is being submitted to the San <br /> ' Joaquin County Environmental Health Department (EHD) and the California Regional Water <br /> Quality Control Board, Central Valley Region (RWQCB) to satisfy the No Further Action (NFA) <br /> requirements, as outlined by RWQCB (Appendix B of the Tri-Regional Recommendations) A <br /> ' completed checklist of data required for closure consideration is included as Appendix A <br /> 2.0 HYDROGEOLOGIC SETTING <br /> The subject site is located at 1766 Monte Diablo Avenue in Stockton, California, approximately <br /> 0 35 mile north of the Port of Stockton deep water channel turning basin (San Joaquin River) and <br /> ' approximately 1 4 miles to the south of the Calaveras River (Figure 1) The San Joaquin River <br /> has been identified by the California Department of Water Resources (DWR) as an off-flow body <br /> of water, meaning water will flow out of the river into the subsurface, not flow from the <br /> subsurface into the river <br /> ' The site is situated at an approximate elevation of 6 5 feet above mean sea level, in the Great <br /> Valley geomorphic province The Great Valley province is a north-south elongated structural <br /> trough filled with sediment from marine and continental sources The continentally derived <br /> ' sedimentary deposits comprise the upper portion of the valley fill, and were deposited in fluvial, <br /> alluvial, and lacustrme environments <br /> ' The site is situated on level terrain Soil stratigraphy in the site vicinity is characterized by <br /> horizontal distributary channel and overbank deposits composed primarily of silty sand-sand and <br /> sandy-silt with lesser amounts of clayey-silts These sediments were derived predominantly from <br /> ' igneous and metamorphic rocks of the Sierra Nevada Mountains to the east and are part of the <br /> Quaternary aged Modesto formation <br /> ' Groundwater monitoring data collected from the site indicate groundwater has historically been <br /> present at approximately 10 to 20 feet below ground surface (bgs) The gradient has been reported <br /> at several different directions over time However, based on topographic gradient and on <br /> w 1271421reportsklosure doc 1 <br /> I� U <br />