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30 March 2021 AdvancedGeo Project No. 21-6352 An Employee-Owned Company Page 10 of 15 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 north 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 2020, depth to groundwater at the site is approximately 65 to 70 feet bsg. Between 2011 and 2019, depth to groundwater at the site has fluctuated between 70 and 90 feet bsg. Groundwater flow direction locally appears to be toward the east. Groundwater was not encountered in the 42-inch-deep percolation test hole advanced on 18 March 2021. 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION The immediately adjacent and outlying land use for the parcel is residential. 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 revealed one (1) LUST site within a half-mile radius of the subject property. The LUST site has been closed since 2010 and based on the status of the site and the distance and direction from the subject property, the site should not impact the subject property. 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 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 The existing water supply well at 8675 Carey Court (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.