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18 September 2020 AdvancedGeo <br /> Project No. 20-6116 An Employee-Owned Company <br /> Page 6 of 15 n N'V. <br /> 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br /> The immediately adjacent and outlying land use for the parcel is mostly agricultural with <br /> minor residential land use. Potential groundwater contamination can occur from several <br /> sources including leaking underground storage tanks, septic systems, agricultural <br /> activities, dairies, and stormwater infiltration. <br /> A review of the California Department of Toxics and Substance Control (DTSC) <br /> EnviroStor Database and the Geotracker Web site did not reveal any properties of <br /> environmental concern within a half-mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There are currently no water supply wells at the subject property (Figure 3). <br /> Following the parcel boundary change, the existing domestic water well (DW-1) located <br /> at the southwest residence will be located on the subject property. The well was installed <br /> in November 2000 as a domestic/private well (SR0024485). The well is composed of <br /> 8-inch diameter plastic casing installed in a 14-inch diameter borehole to a total depth of <br /> 205 feet bsg. The well grout seal is installed to 108 feet bsg (Appendix B). <br /> Well DW-1 provides potable water to the southwest residence and irrigation water to the <br /> subject property. The approximate well location is depicted in Figure 3 and a copy of the <br /> well permit is included in Appendix B. <br /> 4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br /> Nitrate (NO3) constituents were tested in the existing groundwater supply well located at <br /> the southwest residence (DW-1). Well DW-1 will be located on the subject property once <br /> the parcel boundaries have been changed. <br /> 4.5. GROUNDWATER SAMPLE COLLECTION <br /> On 09 September 2020, a sample of the drinking water provided by DW-1 was collected <br /> in an unpreserved 0.5-liter plastic container. The groundwater sample container was <br /> properly labeled, placed in a chilled container and transported under chain-of-custody <br /> protocols to McCampbell Analytical, Inc. (MAI), a California Environmental Laboratory <br /> Accreditation Program (ELAP)-certified laboratory. The sample was analyzed for Nitrate <br /> as Nitrogen (N) and Nitrate as NO3-. <br />