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NOMA <br /> Working To Restore Nature <br /> 1710 Ma In Street CLOSURE REQUEST REPORT <br /> Escalon, CA 95320 for <br /> ' Phone (209) 838-3507 Stockton Police Facility <br /> FAX (209) 838-3509 22 East Market Street <br /> Stockton, California <br /> 1.0 INTRODUCTION AND PURPOSE <br /> RESNA Industries Inc (RESNA) has prepared this report on behalf of the City of Stockton <br /> Public Works Department The purpose of the report is to present the information required for <br /> site closure review This report is being submitted to the California Regional Water Quality <br /> ' Control Board (RWQCB) and San Joaquin County Public Health Services Environmental Health <br /> Division (PHSIEHD) to satisfy the closure review requirements, as outlined by RWQCB <br /> jcorrespondence dated October 7, 1993 (Addition to Appendix A of the Tri-Regional <br /> Recommendations) <br /> 2.0 HYDROGEOLOGIC SETTING <br /> The subject site is located in Stockton, California (Figure 1) situated on level terrain underlain <br /> by flood basin deposits of Pleistocene and Holocene age These sediments are composed of <br /> clay, silt, and some sand In the San Joaquin Valley, the Flood Basin Deposits (Holocene) have <br /> been estimated to be as much as 100 feet thick (USGS, 1986) The USDA Soil Conservation <br /> Service identifies these soils as Jacktone Clay (USDA, 1992) with soil organic matter of 2-5% <br /> (1 16-2 9% organic carbon) Because of their fine-grained nature, these deposits in general do <br /> not yield much water to wells and impede the vertical movement of water The majority of <br /> 1 groundwater used for irrigation and drinking water supplies is extracted from more permeable <br /> zones beneath the flood basin deposits <br /> Based on data from bonn s, the soils beneath the subject site are cam used of clay and silt from <br /> g J p Y <br /> the surface to approximately 28 feet below surface grade, and silt and silty sand from 28 to 55 <br /> oW0148\REP0RTSNCR-0694 FNL 1 <br />