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U <br /> ICVVY, EiT( <br /> A S S O C I A T E S I N C <br /> ' CLOSURE REPORT <br /> Eggiman,Andrew and Edith Trust Property <br /> 1112 East Harding Way <br /> ' Stockton,California <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. has prepared this report on behalf of Eggiman, Andrew and Edith Trust to <br /> present the information required for site closure review for Eggiman, Andrew and Edith Trust <br /> property located at 1112 East Harding Way, Stockton, California(Figure 1). This report is being <br /> submitted to the San Joaquin County Public Health Services, Environmental Health Division <br /> ' <br /> (PHS/EI-ID) and the California Regional Water Quality Control Board, Central Valley Region <br /> (RWQCB) to satisfy the No Further Action (NFA) requirements, as outlined by CRWQCB <br /> (Appendix B of the Tri-Regional Recommendations). A completed checklist of data required for <br /> closure consideration is included as Appendix A. <br /> 2.0 HYDROGEOLOGIC SETTING <br /> The subject site is located at 1112 East Harding 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 derived sedimentary <br /> deposits comprise the upper portion of the valley fill, and were deposited in fluvial, alluvial, and <br /> ' lacustrine environments. <br /> The site is situated on level terrain. The soils at the property have been mapped by the United <br /> States Department of Agriculture (USDA), Soil Conservation Service as the Jacktone Urban Land <br /> Complex. This nearly level map unit is in the basin. The annual precipitation is about 14 inches <br /> (USDA, 1992). <br /> The Jacktone soil is moderately deep to hardpan and is generally poorly drained soil. This soil <br /> ' consists of clay, silt and some sand deposited during flood stages of major streams in the delta area <br /> including mud, muck, loam and sand. Permeability is slow in the Jacktone soil. Available water <br /> capacity is moderate. The rate of water intake in irrigated areas is 0.1 inch per hour. Where the <br /> Jacktone complex is used for development,the main limitations are high shrink-swell potential, the <br /> slow permeability, depth to hardpan, and Iow strength(USDA, 1992). <br /> 1 w:1943041reportslclosure.doc 1 <br /> f' <br />