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1 v <br /> 0 <br /> 1 <br /> ASSOCIATES I NC <br /> Closure Report <br /> ' N&S Imgation <br /> 215 West Main Street <br /> ' Ripon, California <br /> ATC Project No 54 14981 0001 <br /> 1.4 INTRODUCITON <br /> ATC Associates Inc (ATC) has prepared this report on behalf of Mr Paul Van Dyken to present <br /> the information required for site closure review for the property located at 215 West Main Street, <br /> Ripon, California (Figure 1) This report is being submitted to the San Joaquin County <br /> Environmental Health Department (EHD) and the California Regional Water Quality Control <br /> Board, Central Valley Region (RWQCB) to satisfy the No Further Action {NFA) requirements, as <br /> outlined by RWQCB (Appendix A of the Tri-Regional Recommendations) A checklist of data <br /> ' required for closure consideration is included as Appendix A <br /> 2.0 HYDROGEOLOGIC SETTING <br /> The subject site is located at 215 West Main Street in Ripon, approximately one mule <br /> P California, Pp Y <br /> north of the Stanislaus River (Figure 1) The Stanislaus River has been identified by the California <br /> 1 Department of Water Resources (I)WR) as an off-flow body of water, meaning water will flow <br /> out of the river into the subsurface, not flow from the subsurface into the river The site is <br /> ' situated on level terrain at an approximate elevation of 60 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 lacustnne environments <br /> ' Soil stratigraphy in the site vicinity is characterized by horizontal distributary channel and overbank <br /> deposits composed primarily of silty sand, sand and sandy-silt with lesser amounts of silty-clays These <br /> sediments were derived predominantly from igneous and metamorphic rocks of the Sierra Nevada <br /> Mountains to the east and are part of the Quaternary aged Modesto formation <br /> Groundwater monitoring data collected from the site indicate groundwater has historically been present <br /> ' at approximately 22 to 29 feet below ground surface (bgs) The gradient has been reported to the <br /> northwest, north, and northeast over time A northwesterly groundwater flow direction has been the <br /> predominant groundwater flow direction observed during the last two years of quarterly groundwater <br /> ' monitoring activities conducted at the site <br /> w 1149$1lreportslc1osum doe 1 <br />