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Soil Suitability Evaluation Page 5 of 18 <br />Austin Road Mini Storage <br />183 South Austin Road, Manteca, California <br />December 13, 2021 NATS Job # 22-282G <br />Soils encountered in the percolation test hole (P-1) are considered consistent with those <br />described on published mapping. Soils encountered in P-1 from groundsurface to the <br />maximum depth explored (36 inches) are described as light brown, dry, silty, fine sand <br />(SM). A log of the test hole is included in Appendix -A. The location of the percolation <br />test is shown on the attached "Exploration Map" (Figure -2). All test holes were <br />backfilled upon completion of testing. <br />7.0 PERCOLATION TESTING <br />Our subsurface investigation included conducting a leach field soil suitability evaluation <br />via percolation testing. The evaluation included the digging and testing of one <br />percolation test hole at the location shown on Figure -2. The percolation test (P-1) was <br />conducted at the proposed leach field location at a depth of 36 -inches. <br />7.1 Percolation Testing Procedure <br />Upon completion of digging the percolation test hole, any remaining loose material was <br />removed, a 2 -inch layer of fine gravel was placed at the bottom of each hole, and a 4 - <br />inch diameter open-ended slotted drain pipe was installed to control potential sidewall <br />caving. Pre -saturation of the soils to be tested was accomplished by adding water to 36 - <br />inches above the gravel in the test hole 24 hours preceding the test. After 24 hours the <br />36 -inch column of water had "dissipated" from the test hole (P-1). <br />Percolation testing was performed by adding water to a level of 6± inches above the top <br />4713 ENTERPRISE WAY * SUITE 4 * MODESTO * CALIFORNIA * 95356 * 209-545-1108 <br />