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r <br /> CLOSURE SUMMARY REPORT <br /> October 1996 <br /> Stockton Municipal Wastewater Treatment Plant <br /> 2500 Navy Drive, Stockton, California <br />' <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br />' In accordance with a request from the City of Stockton - Department of Public Works, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this Closure Summary Report (CSR) for the site at <br />' 2500 Navy Drive in Stockton, California (the site) The scope of work was to prepare a report <br /> summarizing removal and subsequent assessment activities related to two former underground <br /> storage tanks (USTs) The location of the site is illustrated on Figure 1 - Location Map The site <br />' layout is depicted on Figure 2 - Site Plan <br /> This report was prepared in accordance with Tri-Regional Board and San Joaquin County Public G <br />' Health Services - Environmental Health Dn ision (PHS-EHD) guidelines for the investigation of <br /> UST sites <br /> 1 20. BACKGROUND ' <br /> 2 1 SITE LOCATION <br /> The site, which is used as a waste water treatment plant by the City of Stockton, is located in a flat <br />' industrial area of the western portion of the Port of Stockton in San Joaquin County, California Two <br /> USTs were formerly located west of the parking area, near several buildings and parking structures <br />' (Figure 2) <br /> 4 <br />' 22 REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING <br /> The subject site is located in the central portion of the Great Valley geomorphic province of <br /> California The valley is a nearly flat, elongate trough trending northwest and southeast for <br /> approximately 450 miles The valley is enclosed by the granitic Sierra Nevada Mountains on the east <br /> and the sedimentary and metamorphic Franciscan Coast Range on the west The surficial and upper <br />' several thousand feet of'subsurface layers consist primarily of unconsolidated and consolidated <br /> alluvial and flood plain sheet deposits (predominantly sand, silt and clay) of Quaternary age, which <br /> is derived from the Sierra Nevada Mountains Beneath the upper sedimentary deposits lies a thick <br />' sequence of marine deposits of Mesozoic age, which in turn are underlain by a pre-Jurassic complex <br /> of igneous and metamorphic rock <br /> 1 <br />