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' CLOSURE REQUEST REPORT <br /> Holt Bros. <br /> 1541 West Charter Way <br />' Stockton, California <br /> 1 <br /> 1.0 INTRODUCTION AND PURPOSE <br />' Smith Technology Corporation has prepared this report on behalf of Holt Bros to present the <br /> information required for site closure review for Holt Bros ' property located at 1541 West <br /> Charter Way, in Stockton, California (Figure 1) This report is being submitted to the San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) and the <br /> California Regional Water Quality Control Board, Central Valley Region (CRWQCB) to satisfy <br /> the closure review requirements, as outlined by CRWQCB (Appendix B of the Tri-Regional <br /> Recommendations) <br /> ' 2.0 HYDROGEOLOGIC SETTING <br /> The subject site is located at 1541 West Charter Way, in Stockton, California (Figure 1) The site <br /> is situated at an approximate elevation of 5 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-denved sedimentary <br /> ' deposits comprise the upper portion of the valley fill, and were deposited in fluvial, alluvial, and <br /> lacustrine environments <br /> ' The soils beneath the site are comprised of interbedded and interfingenng clay, silts, and fine grain <br /> sands These are interpreted as flood basin deposits which were deposited in low-lying areas <br /> adjacent to streams during penods of flooding Infiltration and permeability rates are low due to <br /> the relatively fine grain size of the interfingered clays and silts <br /> During the period of investigation, the depth to groundwater at the site has ranged from 17 04 <br /> ' feet (MW-5R2, August 29, 1996) to 28 89 feet (MW-2, March 28, 1992) below grade When <br /> groundwater levels were last measured on December 6, 1996, the depth to water ranged from <br /> 16 46 feet (MW-5R2)to 18 88 feet (MW-3) below grade The direction of groundwater flow has <br /> vaned greatly due to the heterogeneous nature of the soils beneath the site The groundwater <br /> flow has been generally south varying from southeast to southwest, with a gradient magnitude of <br /> approximately 0 005 feet per foot <br /> . w 1943311c1cs=&c 1 <br /> SI"H <br />