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30 August 2019 AdvancedGeo <br /> AGE Project No. 19-4819 Environmental <br /> Page 6 of 15 <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) Water Data Library, depth to groundwater at the site is approximately 20 to 30 <br /> feet below surface grade (bsg). Groundwater flow direction locally appears to be toward <br /> the north. Groundwater was not encountered in the 42-inch deep percolation test hole on <br /> 22 August 2019. <br /> 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br /> The immediately adjacent and outlying land use for the parcel is residential and <br /> agricultural. Potential groundwater contamination can occur from several sources <br /> including leaking underground storage tanks, septic systems, agricultural activities, <br /> dairies, and stormwater infiltration. A review of the California Department of Toxics and <br /> Substance Control (DTSC) EnviroStor Database and the Geotracker Web site did not <br /> reveal any sites of 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 May 1976 under EHD permit number 76-330W (Appendix B). The well is constructed <br /> with a 6.625-inch diameter casing and a grout seal to 50 feet; the total depth and screen <br /> interval of the well is unknown. Currently, the well provides potable water to the existing <br /> residence onsite and will provide potable water to the proposed residence. <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 /> 4.5. GROUNDWATER SAMPLE COLLECTION <br /> On 22 August 2019, a sample of the drinking water supplied by the current groundwater <br /> supply well at 17454 Von Sosten Road, Tracy was collected in an unpreserved 0.5-liter <br /> plastic container. The groundwater sample container was properly labeled, placed in a <br /> chilled container and transported under chain-of-custody protocols to McCampbell <br /> Analytical, Inc. (MAI), a California Environmental Laboratory Accreditation Program <br /> (ELAP)-certified laboratory. The sample was analyzed for Nitrate as Nitrogen (N) and <br /> Nitrate as NO3-. <br />