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01 April 2021 AdvancedGeo <br /> Project No. 21-6365 AnEmployee•OwnedCompany <br /> Page 7 of 15 <br /> California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. <br /> The sample was analyzed for Nitrate as Nitrogen (N), Nitrate as NO3-, and DBCP. <br /> 4.6. GROUNDWATER ANALYTICAL REPORT <br /> Nitrate as N, Nitrate as NO3-, and DBCP were not detected above laboratory reporting <br /> limits. The MAI laboratory report (Work Order: 2103D57) with quality assurance/quality <br /> control (QA/QC) reports and chain-of-custody form are provided in Appendix C. <br /> 5.0. SOIL PROFILE <br /> An OWTS Permit was issued for the property by the EHD on 16 March 2021 to perform <br /> a percolation test (Appendix D). On 22 March 2021, a 4-inch diameter hand auger was <br /> utilized to advance a percolation test hole to 42 inches bsg, in the proposed septic system <br /> disposal field area. <br /> A plan of the specific site features including the percolation test hole locations <br /> (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural <br /> drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. <br /> 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS <br /> The percolation test hole was located in the disposal field area of the proposed <br /> replacement septic system and within 100 feet of the proposed second septic system. <br /> The percolation test hole was advanced to a depth of 42 inches bsg using a four-inch <br /> diameter hand auger (Figure 2). <br /> 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES <br /> The soil was visually described in accordance with the Unified Soil Classification System <br /> (USCS) by a representative of AGI under the supervision of a California Professional <br /> Geologist. The soil collected from the percolation test hole boring consisted of dry, silty <br /> clay from surface grade to 24 inches bsg; silt with fine-grained sand from 24 inches to <br /> 36 inches bsg; and silty fine-grained sand from 36 inches to 42 inches bsg. The soil type <br /> from 24 inches to 42 inches bsg is considered semi-permeable to permeable and should <br /> be sufficient for liquid waste disposal and treatment. <br /> 6.0. PERCOLATION TEST INFORMATION <br /> A percolation soil suitability test was performed at the site under EHD permit No. <br /> SR0083409 using a four-inch diameter soil boring established to a depth of 42 inches <br />