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22 December 2020 AdvancedGeo <br /> Project No. 20-6228 An Employer-Owned Company <br /> Page 6 of 15 <br /> be toward the northeast. Groundwater was not encountered in the 42-inch-deep <br /> percolation test hole advanced on 10 December 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, agricultural <br /> and vacant. Potential groundwater contamination can occur from several sources <br /> including leaking underground storage tanks, septic systems, agricultural activities, <br /> 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 sites of <br /> environmental concern within a 0.5-mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There is one existing domestic water well on the property. The installation date and <br /> construction specifications of the well are unknown and there are no well permits on file <br /> at the EHD. AGI reviewed files using the Department of Water Resources (DWR) online <br /> database and could not locate any additional information about the well. The onsite <br /> domestic water well may provide potable water to the planned development if determined <br /> to be acceptable. <br /> 4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br /> Nitrates (NO3) and dibromochloropropane (DBCP) were tested in the existing <br /> groundwater supply well at the subject property. <br /> 4.5. GROUNDWATER SAMPLE COLLECTION <br /> On 10 December 2020, a sample of the water provided by the current groundwater supply <br /> well at 10124 South Priest Road was collected in an unpreserved 0.5-liter plastic <br /> container and in three unpreserved Volatile Organic Analysis (VOA) 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 /> California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. <br /> The sample was analyzed for Nitrate as Nitrogen (N), Nitrate as NO3-, and DBCP. <br />