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30 August 2019 AdvancedGeo AGE Project No. 19-4819 Environmental Page 7 of 15 4.6. GROUNDWATER ANALYTICAL REPORT Nitrate as N was detected at 1.5 milligrams per liter (mg/1) and Nitrate as NO3- was detected at 6.6 mg/I in the water sample. The MAI laboratory report (Work Order: 1908C95) 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 16 August 2019 to perform a percolation test (Appendix D). On 22 August 2019, 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). 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 silty clayey fine- grained sand from surface grade to approximately 30 inches bsg and fine-grained sand with 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. 6.0. PERCOLATION TEST INFORMATION A percolation soil suitability test was performed at the site under EHD permit No. SR0081050 using a four-inch diameter soil boring established to depths of 42 inches bsg. A site map showing the approximate location of the percolation test hole is illustrated in Figure 2. 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). The soil suitability study was conducted within the area of the proposed septic system leach field.