Laserfiche WebLink
Percolation Test Results <br /> The completed percolation test form is included in Appendix 3 of this report. The form <br /> was signed by Ms. Salinas and indicates a percolation rate for each hole based on the <br /> least water drop observed. <br /> Per San Joaquin County Environmental Health Department's definition, a shallow <br /> percolation test hole has a depth between 36 and 42 inches; a satisfactory percolation <br /> rate for a shallow test is greater than or equal to 1 minute per inch (min/in) but less than <br /> or equal to 60 min/in drop. A deep percolation test hole has a depth between 3.5 and <br /> 25 feet; a satisfactory percolation rate for a deep test is greater than or equal to 1 min/in <br /> but less than or equal to 30 min/in drop. For the Site to utilize a standard septic system, <br /> one percolation test hole must demonstrate a satisfactory percolation rate within the <br /> proposed septic system disposal field. <br /> Details and results of the percolation testing are summarized in the following table. <br /> Table 2. Percolation Test Summary <br /> Test No., Percolation Test Percolation Rate Test Duration Comments <br /> Date Tested Depth (ft.) (minutes/inch) (see notes) <br /> P1-S, <br /> 3/11/2021 3.04 35.7 4 hr. Satisfactory perc. <br /> rate <br /> Shallow Test <br /> P1-S, <br /> 3/11/2021 7.59 5.3 4 hr. Satisfactory perc. <br /> rate <br /> Deep Test <br /> Note: A satisfactory percolation rate for a "shallow" test is greater than 1 but less than or equal to 60 minutes per <br /> inch. A satisfactory percolation rate for a "deep" test is greater than 1 but less than or equal to 30 minutes <br /> per inch. <br /> 1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30.0 min/in requires an <br /> 8-foot separation between the bottom of dispersal system and ground water, or mitigation by system design <br /> or enhancement. <br /> Discussion of Percolation Test Results <br /> The soils within the proposed sewage disposal area of the Site have demonstrated a <br /> satisfactory percolation rate for the use of a septic system in accordance with the <br /> requirements of the San Joaquin County Environmental Health Department. This <br /> percolation test is considered representative of soils within a 100-foot radius of the test <br /> location. <br /> Because of the percolation rate between 5.0 and 30.0 min/in encountered in the test <br /> hole, the San Joaquin County Environmental Health Department may require an 8-foot <br /> separation from the bottom of the dispersal system to ground water, or other system <br /> modification. The depth to water beneath the Site is anticipated to be 50 to 62 feet, <br /> LOGE 2107 Page 7 <br />