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21 June 2019 AdvancedGeo <br /> AGE Project No. 19-4745 Environmental <br /> Page 6 of 14 <br /> 4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA <br /> The San Joaquin County Flood Control and Water Conservation District's Lines of Equal <br /> Depth to Groundwater Fall 2018 indicates the depth to groundwater is 40 feet below <br /> surface grade (bsg). Groundwater flow direction locally appears to be northeast to <br /> southeast. Groundwater was not encountered in the 36-inch percolation test hole on <br /> 12 June 2019. <br /> 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br /> The immediately adjacent and outlying land use for the parcel is commercial, agricultural <br /> and residential. There are potential groundwater contamination issues associated with <br /> local septic systems and agricultural uses. A review of the California Department of Toxics <br /> and Substance Control (DTSC) EnviroStor Database and the Geotracker Web site <br /> revealed several closed leaking underground storage tank (LUST) sites within a half-mile <br /> radius of the site. One spills, leaks, investigation and cleanup (SLIC) site (Marley Cooling <br /> Tower Company) is located 0.75-miles from the site. The SLIC site is currently open and <br /> in the process of remediating chromium and hexavalent chromium in groundwater. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There are no water wells on the property. The existing potable water service is provided <br /> by the California Water Service Company. <br /> 5.0. SOIL PROFILE <br /> An Onsite Wastewater Treatment System Permit was issued by the EHD on <br /> 11 June 2019 for the site to perform a percolation test (Appendix C). On 12 June 2019, a <br /> 4-inch diameter hand auger was utilized to advance a percolation test hole to 42 inches <br /> bsg on the parcel. <br /> A plan of the specific site features including the percolation test hole location (i.e., <br /> structures, drives, wells, septic systems, large trees, pastures, pools, natural drainage <br /> courses, ponds, waterways, etc.) is illustrated in Figure 2. <br /> 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS <br /> The test hole was located approximately 35-40 feet from the existing septic system. The <br /> percolation test hole was advanced to a depth of 42 inches bsg using a 4-inch diameter <br /> hand auger (Figure 2). <br />