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20 July 2021 AdvancedGeo <br /> Project No. 21-6486 An Employee-Owned Company <br /> Page 6 of 15 <br /> 4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA <br /> According to the State of California Department of Water Resources (DWR) Sustainable <br /> Groundwater Management Act (SGMA) Data Viewer, Seasonal Report for Spring 2020, <br /> depth to groundwater at the site is approximately 75 feet below surface grade (bsg). <br /> Between 2011 and 2019, depth to groundwater at the site has fluctuated between 75 and <br /> 95 feet bsg. Groundwater flow direction locally appears to be to the east-southeast. <br /> Groundwater was not encountered in the 42-inch-deep percolation test hole advanced on <br /> 30 June 2021. <br /> 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br /> The immediately adjacent and outlying land use for the parcel is residential. Potential <br /> groundwater contamination can occur from several sources including leaking <br /> underground storage tanks, septic systems, agricultural activities, dairies, and stormwater <br /> infiltration. <br /> A review of the California Department of Toxics and Substance Control (DTSC) <br /> EnviroStor Database and the Geotracker Web site revealed one (1) leaking fuel <br /> underground storage tank (LUST) site within a half-mile radius of the subject property. <br /> The LUST site has been closed since 1998. Based on the status of the site and the <br /> distance and direction from the subject property, the site should not impact the subject <br /> property. The review did not reveal any other sites of environmental concern within a half- <br /> mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There are two existing domestic water supply wells on the property serving each of the <br /> property residences. The well serving the larger residence on the west side of the property <br /> (West Well) was constructed in January 2012 to a total depth of 320 feet bsg. This well <br /> features a 6-inch-diameter PVC casing, a 3-horsepower submersible pump set at 147 <br /> feet bsg, and a sanitary seal to 100 feet bsg. The well serving the smaller residence in <br /> the east side of the property (East Well) consists of a 6-inch diameter, PVC casing. <br /> Additional information on the construction specifications for this well were unavailable. <br /> Copies of the available well permits and completion reports are included in Appendix B. <br /> 4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br /> Nitrate (NO3) constituents and 1,2-dibromo-3-chloropropane (DBCP) were tested in the <br /> existing groundwater supply wells at the subject property. <br />