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10 September 2020 AdvancedGeo <br /> Project No. 20-6095 An Employee-Owned Company <br /> Page 6 of 15 -Q W <br /> of the subject property. The nearest surface water feature to the site is the San Joaquin <br /> River, which is approximately five miles west of the subject property. <br /> 4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA <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 Department of Water Resources <br /> (DWR) SGMA Data Viewer, depth to groundwater at the site is approximately 25 to 30 feet <br /> below surface grade (bsg). Between 2011 and 2018, depth to groundwater at the site has <br /> fluctuated between 20 and 30 feet bsg. Groundwater flow direction locally appears to be <br /> toward the north to northeast. Groundwater was not encountered in the 42-inch deep <br /> percolation test hole advanced on 02 September 2020. <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 and one (1) former agricultural property with <br /> potential pesticide impact within a half-mile radius of the subject property. The LUST site <br /> has been closed since 2014 and the agricultural site has been closed since 2001. Based <br /> on the status of the sites and the distance and direction from the subject property, the <br /> sites should not impact the subject property. The review did not reveal any other sites of <br /> environmental concern within a half-mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There is one existing domestic water supply well on the property. The well was installed <br /> in December 1994 as a replacement well for the former site well installed sometime before <br /> 1974 (SR0005037). The well is composed of 6-inch diameter polyvinyl chloride (PVC) <br /> casing installed in a 12-inch diameter bore hole to a total depth of 120 feet bsg. The well <br /> grout seal is installed to 100 feet bsg. The onsite well provides potable water to the <br /> existing residence and property. <br /> 4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br /> Nitrate (NO3) constituents were tested in the existing groundwater supply well at the <br /> subject property. <br />