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18 September 2020 AdvancedGeo <br /> Project No. 20-6116 AnEmployee•OwnedCompany <br /> ,,,N <br /> Page 11 of 16 -'0 N a <br /> infiltration of water through the surface soils. The longer the effluent remains near the <br /> surface, the more treatment is enhanced due to natural processes within the soil. If the <br /> permeable soils exist to the depth of the groundwater table, it is possible that surface <br /> contaminants may be transported fairly rapidly. <br /> 8.0. GROUNDWATER ANALYSIS <br /> The subject property is supplied with potable water by the onsite domestic water wells <br /> (Figure 3). Groundwater samples were collected from the wells and analyzed for nitrates <br /> 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 Fall 2018 and the DWR SGMA Data Viewer, depth <br /> to groundwater at the site is approximately 20 to 30 feet bsg. Between 2011 and 2018, <br /> depth to groundwater at the site has fluctuated between 15 and 30 feet bsg. Groundwater <br /> flow direction locally appears to be toward the northwest. Groundwater was not <br /> encountered in the 42-inch deep percolation test hole advanced on 09 September 2020. <br /> 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION <br /> The immediately adjacent and outlying land use for the parcel is mostly agricultural with <br /> minor residential 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 DTSC EnviroStor Database and the Geotracker Web site did not reveal <br /> any properties of environmental concern within a half-mile radius of the site. <br /> 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE <br /> The existing water supply wells at the subject property conform to DWR and EHD <br /> standards and is used, and will continue to be used, to supply the subject property with a <br /> domestic water source. <br /> 9.0. IMPACT OF NITRATE TO GROUNDWATER <br /> Due to the use of the property and the potential for nitrate leaching into the groundwater, <br /> a nitrate loading analysis is required by the EHD. <br />