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Because of the percolation rate between 1.0 and 5.0 min/in encountered in the test <br />hole, the San Joaquin County Environmental Health Department may require a 20 -foot <br />separation from the bottom of the dispersal system to ground water at that location, <br />unless mitigated by system design or enhancement. <br />Discussion of Septic System Sizing <br />Septic system construction utilizing leach lines or a filter bed should follow the San <br />Joaquin County On -Site Wastewater Treatment Systems Standards (2017) where <br />applicable. <br />LOGE 2135 Page 7 <br />