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20 November 2020 AdvancedGeo <br /> Project No. 20-6205 An Empkyet-Owned Compony <br /> Page 6 of 14 <br /> 4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA <br /> According to the San Joaquin County Flood Control and Water Conservation District's <br /> Lines of Equal Depth to Groundwater Fall 2018 and the Department of Water Resources <br /> (DWR) SGMA Data Viewer, depth to groundwater at the site is approximately 40 feet <br /> below surface grade (bsg). Between 2011 and 2018, depth to groundwater at the site has <br /> fluctuated between 40 and 60 feet bsg. Groundwater flow direction locally appears to be <br /> to the west-southwest. Groundwater was not encountered in the 42-inch deep percolation <br /> test hole advanced on 12 November 2020. <br /> 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br /> The immediately adjacent and outlying land use for the parcel is residential with minor <br /> agricultural land use. Potential groundwater contamination can occur from several <br /> sources including leaking underground storage tanks, septic systems, agricultural <br /> activities, dairies, and stormwater infiltration. <br /> A review of the California Department of Toxics and Substance Control (DTSC) <br /> EnviroStor Database and the Geotracker Web site did not reveal any sites of <br /> environmental concern within a 2,000-foot radius of the subject property. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> Liquid waste septic permits dating back to April 1951 indicate a domestic water well <br /> located on the property. There are two well permits on file with EHD for the subject <br /> property, both are for well pump replacement dated August 1980 and October 2014 <br /> (Appendix B). No additional information could be ascertained about the well. The onsite <br /> domestic water well will provide potable water to the planned development. <br /> The onsite water well was not sampled during this Study because there is currently no <br /> power to the site or well. <br /> 5.0. SOIL PROFILE <br /> An OWTS Permit was issued for the property by the EHD on 03 November 2020 to <br /> perform a percolation test (Appendix C). On 12 November 2020, a 4-inch diameter hand <br /> auger was utilized to advance a percolation test hole to 42 inches bsg, in the proposed <br /> septic system disposal field area. <br /> A plan of the specific site features including the percolation test hole locations <br /> (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural <br /> drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. <br />