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LOGE 20-18b: Ng Percolation Test Page 3 July 2, 2020 The soils on the Site have demonstrated a satisfactory percolation rate for the use of a standard septic system in accordance with the requirements of the San Joaquin County Environmental Health Department. This percolation test is considered representative of soils within a 100-foot radius of the test location. Based on the percolation rate encountered between 5.0 and 30 min/in, the San Joaquin County Environmental Health Department will require an eight-foot separation from the bottom of the dispersal system to ground water. Ground water is anticipated to be encountered approximately 12 to 16 feet below ground surface at the Site; consequently, no modifications to a standard, shallow septic system should be required. Discussion The May 1, 2019 percolation test was conducted to the northwest of the current test location in an area where orchard trees had been recently removed for construction of the house. The April 28, 2020 percolation test was conducted farther northwest within an area that had received fill soil for construction; at the time, the septic system was planned for that area. The current test was conducted on undisturbed, native soil, within the proposed leach field area and, as such, is considered the most representative of future soil conditions in the leach field area, when compared with the previous two percolation tests. It is worth noting that, based on visual inspection of the Site and Site Map, approximately half the leach field will be located within fill soil and half within native soil. The portion of the leach field within fill soil may be expected to experience slower percolation rates, as demonstrated by the April 28, 2020 percolation test. Septic system construction utilizing leach lines or a filter bed should follow the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where applicable. The new septic system will require a permit from the San Joaquin County Environmental Health Department. We are pleased to be of service on this project. Please feel free to contact us should you have any questions. Sincerely. Live Oak GeoEnvironmental, Inc. Abigail lAacco, Project Manager 4 DAVID J.VVFLCH DAVID J.VSEL * N0.2151 * a W0.953 *�l CERTIFIED = j ER'GfNEEAiNG David Welch, Engineering Geologist sl GEOWGISr CEG-2151, CHG-653, PGP-1049 9jFpFCAUFp�w� ��j �