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(VSATC V ASSOCIATES I N C . V CLOSURE REPORT City of Stockton Fire Station No.3 1116 First Street Stockton,California V V 1.0 INTRODUCTION ATC Associates Inc. has prepared this report on behalf of the City of Stockton Public Works Department to present the information required for site closure review for the Fire Station No. 3 property located at 1116 First Street, Stockton, California (Figure 1). This report is being submitted to the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) and the California Regional Water Quality Control Board, Central Valley Region (RWQCB) to satisfy the No Further Action (NFA) requirements, as outlined by CRWQCB (Appendix B of the Tri-Regional Recommendations). A completed checklist of data required for closure consideration is included as Appendix A. 2.0 HYDROGEOLOGIC SETTING The subject site is located at 1116 First Street in Stockton, California (Figure 1). The site is situated at an approximate elevation of 18 feet above mean sea level, in the Great Valley geomorphic province. The Great Valley province is a north-south elongated structural trough filled with sediment from marine and continental sources. The continentally derived sedimentary deposits comprise the upper portion of the valley fill, and were deposited in fluvial, alluvial, and lacustrine environments. The site is situated on level terrain. The soils at the property have been mapped by the United States Department of Agriculture (USDA), Soil Conservation Service as the Jacktone Urban Land Complex. This nearly level map unit is in the basin. The annual precipitation is about 14 inches(USDA, 1992). The Jacktone soil is moderately deep to hardpan and is generally poorly drained soil. This soil consists of clay, silt and some sand deposited during flood stages of major streams in the delta area including mud, muck, loam and sand. Permeability is slow in the Jacktone soil. Available water capacity is moderate. The rate of water intake in irrigated areas is 0.1 inch per hour. Where the Jacktone complex is used for development, the main limitations are high shrink-swell potential, the slow permeability, depth to hardpan, and low strength(USDA, 1992). V The closest surface water to the site is Mormon Slough, approximately 0.3 miles to the north. Duck --' Creek is approximately 1.2 miles to the south. Monitoring data collected from the site indicate w:\62574.05\rcpotU\closm-FS3.doc 1 V