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18 September 2020 AdvancellGeo Project No. 20-6116 An Employee-Owned Company Page 8 of 16 '.N • Nitrate as N was detected at 19 mg/I and Nitrate as NO3- was detected at 82 mg/I in the water sample collected from DW-2. • Nitrate as N was detected at 8.7 mg/1 and Nitrate as NO3-was detected at 38 mg/I in the water sample collected from DW-3. The MAI laboratory report (Work Order: 2009489) 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 31 August 2020 to perform percolation tests (Appendix C). On 09 September 2020, a 4-inch diameter hand auger was utilized to advance two percolation test holes to 42 inches bsg at the site. Percolation tests were performed near the southern property boundary, in the southwest corner of the nursery (P-1) and in the orchard, southeast of the residence (P-2). Percolation test hole locations are depicted in Figure 3. 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 Figures 2 and 3. 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS The percolation test holes were advanced to total depths of 42 inches bsg using a four- inch diameter hand auger (Appendix D). 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES The soil was visually described in accordance with the Unified Soil Classification System (USCS) by a representative of AGI under the supervision of a California Professional Geologist. The soil collected from the percolation test hole borings consisted of dry, fine- grained sand from surface grade 42 inches bsg. The soil type at the base of the borehole is considered semi-permeable to permeable and should be sufficient for liquid waste disposal and treatment. 6.0. PERCOLATION TEST INFORMATION Percolation soil suitability tests were performed at the site under EHD permit No. SR0082532 using four-inch diameter soil borings established to 42 inches bsg. A site map showing the approximate location of the percolation test holes is provided in Figure 3. A precise description of the location and construction of the percolation test hole is included in Appendix D (EHD form 42-03 revised 11/02/2009).