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23 October 2019 AdvancedGeo AGE Project No. 19-4881 E rr v i ro n m e n t a I Page 7 of 15 -� 4.5. GROUNDWATER SAMPLE COLLECTION On 10 October 2019, a sample of the drinking water provided by the current groundwater supply well at 228 Klo Road, Lathrop was collected in an unpreserved 1-liter plastic container. The groundwater sample container was 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 (E LAP)-certified laboratory. The sample was analyzed for Nitrate as Nitrogen (N) and Nitrate as NO3-. 4.6. GROUNDWATER ANALYTICAL REPORT Nitrate as N was detected at 63 milligrams per liter (mg/1) and Nitrate as NO3- was detected at 280 mg/I in the water sample. The MAI laboratory report (Work Order: 1910571) 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 03 October 2019 to perform a percolation test (Appendix D). On 10 October 2019, a 4-inch diameter hand auger was utilized to advance a percolation test hole to 39 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 39 inches bsg using a four- inch diameter hand auger (Figure 2). 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES The soil was visually described in accordance with the Unified Soil Classification System by a representative of AGE under the supervision of a California Professional Geologist. The soil collected from the percolation test hole boring consisted of dry, fine-grained silty sand from surface grade to approximately 30 inches bsg and fine-grained sandy silt from 30 inches bsg to total depth. The soil type is considered semi-permeable to permeable and sufficient for liquid waste disposal and treatment.