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• rate for a shallow test is less than or equal to 60 minutes per inch (min/in) drop. For the Site to utilize a standard septic system, a percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field. Details and results of the percolation tests are summarized in the following table. Table 2. Percolation Test Summary Test No., Percolation Percolation Test Duration Comments Date Tested Test Rate (see notes) Depth (ft.) (minutes/inch) P1 1-19-18 3.12 2.6 1 hr. Satisfactory Shallow Test perc. rate P2 Satisfactory 1-19-18 3.02 5.2 1 hr. pert. rate Shallow Test Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. Discussion of Percolation Test Results The soils within the percolation test areas have demonstrated satisfactory percolation • rates for the use of septic systems utilizing leach lines or filter beds in accordance with the requirements of the San Joaquin County Environmental Health Department. On Parcel 1, based on the percolation rate of 2.6 min/in, the San Joaquin County Environmental Health Department will require either a 20-foot separation from the bottom of the dispersal system to ground water, or mitigation of the rapid percolation rate by septic system design or enhancement. On Parcel 2, based on the percolation rate of 5.2 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. Discussion of Septic System Sizing Future septic system construction should follow the San Joaquin County On-Site Wastewater Treatment Systems Standards (2016) where applicable. The septic system at the secondary house is currently being relocated; no other new construction is anticipated. • LOGE 1801 Page 7