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20 July 2021 AdvancedGeo Project No. 21-6486 An Employee-Owned Company Page 7 of 15 4.5. GROUNDWATER SAMPLE COLLECTION On 30 June 2021 , samples of the drinking water provided by the current groundwater supply wells at 12511 Mundy Lane, Lodi, California were collected from each well in an unpreserved 0.5-liter plastic container and two volatile organic analysis (VOAs) vials. The groundwater sample containers were properly labeled, placed in a chilled container, and transported under chain-of-custody protocols to McCampbell Analytical, Inc. (MAI), a California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. The samples were analyzed for Nitrate as Nitrogen (N), Nitrate as NO3-, and DBCP. 4.6. GROUNDWATER ANALYTICAL REPORT Nitrate as N, Nitrate as NO3-, and DBCP were detected in both water supply wells at the following concentrations: • Nitrate as N was detected at 18 milligrams per liter (mg/1), Nitrate as NO3- was detected at 80 mg/I, and DBCP was detected at 0.11 micrograms per liter pg/I in the water sample collected from the East Well serving the smaller residence. • Nitrate as N was detected at 1.9 mg/I, Nitrate as NO3- was detected at 8.4 mg/I, and DBCP was detected at 0.080 pg/I in the water sample collected from the West Well serving the larger residence. The MAI laboratory report (Work Order: 2106107) with quality assurance/quality control (QA/QC) reports and chain-of-custody form are provided in Appendix C. 5.0. SOIL PROFILE An OWTS Permit was issued for the property by the EHD on 22 June 2021 to perform a percolation test (Appendix D). On 30 June 2021 , a 4-inch diameter hand auger was utilized to advance a percolation test hole to 42 inches bsg, in the proposed septic system disposal field area. A plan of the specific site features including the percolation test hole locations (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. 5.1 . SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS The percolation test hole was located in the disposal field area of the proposed septic system. The percolation test hole was advanced to a depth of 42 inches bsg using a four- inch diameter hand auger (Figure 2).