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01 April 2021 Adva ' cedkse0 <br /> Project No. 21-6365 AnEmpbyee-Owned Company <br /> Page 6of15 n <br /> 40 feet bsg. Groundwater flow direction locally appears to be toward the east. <br /> Groundwater was not encountered in the 42-inch-deep percolation test hole advanced on <br /> 22 March 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 four (4) leaking fuel <br /> underground storage tank (LUST) sites within a 2,000-foot radius of the subject property. <br /> The LUST sites were all closed between 1993 and 1999. Based on the status of the site <br /> and the distance and direction from the subject property, the closed LUST sites should <br /> not impact the subject property. The review did not reveal any other sites of environmental <br /> concern within a 2,000-foot radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There is one existing domestic water well on the property located in the northeastern <br /> corner of the site. The installation date and construction specifications of the well are <br /> unknown. There are two permits on file at the EHD for well pump repair in June 1981 and <br /> June 1999 (81-418 and SR0019684). AGI reviewed files using the Department of Water <br /> Resources (DWR) online database and could not locate any additional information about <br /> the well. The onsite well provides potable water to the existing dwelling and subject <br /> property and will provide water to the proposed modular home. A copy of the well permits <br /> 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 well at the subject property. <br /> 4.5. GROUNDWATER SAMPLE COLLECTION <br /> On 22 March 2021, a sample of the drinking water provided by the current groundwater <br /> supply well at 2111 Waudman Avenue, Stockton, California was collected in an <br /> unpreserved 0.5-liter plastic container and two volatile organic analysis (VOAs) vials. The <br /> groundwater sample containers were properly labeled, placed in a chilled container, and <br /> transported under chain-of-custody protocols to McCampbell Analytical, Inc. (MAI), a <br />