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22 December 2020 AdvancedGeo Project No. 20-6228 An Employee Owned Company Page 10 of 15 near the surface, the more treatment is enhanced due to natural processes within the soil. If the permeable soils exist to the depth of the groundwater table, it is possible that surface contaminants may be transported fairly rapidly. 8.0. GROUNDWATER ANALYSIS The subject property will be supplied with potable water by the onsite domestic water well, if determined to be acceptable, or a new well (Figure 2). A groundwater sample was collected from the well and analyzed for nitrates and DBCP as part of this study. 8.1. DESCRIPTION OF LOCAL GROUNDWATER According to the San Joaquin County Flood Control and Water Conservation District's Lines of Equal Depth to Groundwater Fall 2018 and the DWR SGMA Data Viewer, depth to groundwater at the site is approximately 25 to 30 feet bsg. Between 2011 and 2018, depth to groundwater at the site has fluctuated between 20 and 30 feet bsg. Groundwater flow direction locally appears to be to the northeast. Groundwater was not encountered in the 42-inch-deep percolation test hole advanced on 10 December 2020. 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION The immediately adjacent and outlying land use for the parcel is residential, agricultural, and vacant. Potential groundwater contamination can occur from several sources including leaking underground storage tanks, septic systems, agricultural activities, dairies, and stormwater infiltration. A review of the DTSC EnviroStor Database and the Geotracker Web site did not reveal any sites of environmental concern within a half-mile radius of the site. Based on the information reviewed, there is no existing or known groundwater contamination at the site and the potential for groundwater contamination is de minimis. 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE It is unknown if the existing water well at the subject property conforms to DWR and EHD standards. If the well is determined to conform to DWR and EHD standards, then it may be used to supply the subject property with a domestic water source. If not, a new water supply well will have to be installed at the property to provide the site with a potable water source.