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30 March 2021 AdvancedGeo <br /> Project No. 21-6352 An Employee-Owned Company <br /> Page 6 of 15 �. <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 2010. 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 is one existing domestic water supply well on the property. The well was installed <br /> in September 1996 (SR0010416 and SR0010417). The well is composed of 6-inch <br /> diameter polyvinyl chloride (PVC) casing installed in a 12-inch diameter bore hole to a <br /> total depth of 220 feet bsg. The well grout seal is installed to 100 feet bsg. The onsite well <br /> provides potable water to the existing residence and subject property. A copy of the well <br /> permit is 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 well at the subject property. <br /> 4.5. GROUNDWATER SAMPLE COLLECTION <br /> On 18 March 2021, a sample of the drinking water provided by the current groundwater <br /> supply well at 8675 Carey Court, Stockton, California was collected in an unpreserved <br /> 0.5-liter plastic container and two volatile organic analysis (VOAs) vials. The groundwater <br /> sample containers were properly labeled, placed in a chilled container, and transported <br /> under chain-of-custody protocols to McCampbell Analytical, Inc. (MAI), a California <br /> Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. The sample <br /> was analyzed for Nitrate as Nitrogen (N), Nitrate as NO3-, and DBCP. <br />