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27 April 2020 AdvancedGeo <br /> Project No. 20-5084 AnEmpfoyec OwnedCompcnz <br /> Page 10 of 15 <br /> water through the surface soils. The longer the effluent remains near the surface, the <br /> more treatment is enhanced due to natural processes within the soil. If the permeable <br /> soils exist to the depth of the groundwater table, it is possible that surface contaminants <br /> may be transported fairly rapidly. <br /> 8.0. GROUNDWATER ANALYSIS <br /> The subject property is supplied with potable water by the onsite domestic water well <br /> located to the southwest of the existing residence (Figure 2). A groundwater sample was <br /> collected from the well and analyzed for nitrates as part of this study. <br /> 8.1. DESCRIPTION OF LOCAL GROUNDWATER <br /> According to the San Joaquin County Flood Control and Water Conservation District's <br /> Lines of Equal Depth to Groundwater Spring 2018 and the DWR Water Data Library, <br /> depth to groundwater at the site is approximately 125 bsg. Groundwater flow direction <br /> locally appears to be toward the north. Groundwater was not encountered in the 57-inch <br /> percolation test hole on 16 April 2020. <br /> 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION <br /> The immediately adjacent and outlying land use for the parcel is residential and <br /> agricultural. Potential groundwater contamination can occur from several sources <br /> including leaking underground storage tanks, septic systems, agricultural activities, <br /> dairies, and stormwater infiltration. <br /> A review of the DTSC EnviroStor Database and the Geotracker Web site did not reveal <br /> any sites of environmental concern within a 0.5-mile radius of the site. Based on the <br /> information reviewed, there is no existing or known groundwater contamination at the site <br /> and the potential for groundwater contamination is de minimis. <br /> 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE <br /> The existing water supply well at 11855 Mountain View Road (site) conforms to DWR and <br /> EHD standards and is used to supply the subject property with a domestic water source. <br /> 9.0. IMPACT OF NITRATE TO GROUNDWATER <br /> Due to the residential use of the property and the potential for nitrate leaching into the <br /> groundwater from the existing and proposed septic systems, a nitrate loading analysis for <br /> the future use of the septic systems is required by the EHD. <br />