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30 March 2021 AdvancedGeo Project No. 21-6352 An Employee-Owned Company Page 7 of 15 4.6. GROUNDWATER ANALYTICAL REPORT Nitrate as N was detected at 1.4 milligrams per liter (mg/1) and Nitrate as NO3- was detected at 6.4 mg/I in the water sample; DBCP was not detected above the laboratory reporting limit. The MAI laboratory report (Work Order: 2103C11) 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 11 March 2021 to perform a percolation test (Appendix D). On 18 March 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). 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 boring consisted of dry to damp, silty clay from surface grade to approximately 36 inches and sandy clay from 36 inches to 42 inches bsg. The soil type is considered semi-permeable and should be 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. SR0083393 using a four-inch diameter soil boring established to a depth 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.