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09 August 2022 Project No. 22-6942 Page 10 of 16 AdvancedGea An Employer, Owned Company of water through the surface soils. The longer the effluent remains 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 is supplied with potable water by the onsite domestic water well located to the southwest of the existing residence (Figure 2). A groundwater sample was collected from the well and analyzed for nitrates as part of this study. 8.1. DESCRIPTION OF LOCAL GROUNDWATER According to the DWR SGMA Data Viewer for Spring 2021, depth to groundwater at the site is approximately 60 to 70 feet bsg. Between 2011 and 2021, depth to groundwater at the site has fluctuated between 45 and 70 feet bsg. Groundwater flow direction locally appears to be toward the north. Groundwater was not encountered in the 42 -inch -deep percolation test hole advanced on 01 August 2022. 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION The immediately adjacent and outlying land use for the parcel is residential and agricultural. 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 LUST sites within a half -mile radius of the site. The review did not reveal any other sites of environmental concern within a half -mile radius of the site. Based on the information reviewed, there is no 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 The existing water supply well at 14250 South Jack Tone Road (site) conforms to DWR and EHD standards. The well is currently utilized for the potable water source at the property and will continue to be used to supply the subject property with a domestic water source.