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07 Septmber 2021 <br />Project No. 21-6531 <br />Page 7 of 14 <br />6.0. PERCOLATION TEST INFORMATION <br /> <br />A percolation soil suitability test was performed at the site under EHD permit No. <br />SR0084049 using a four-inch diameter soil boring established to a depth of 42 inches <br />bsg. A site map showing the approximate location of the percolation test hole is illustrated <br />in Figure 2. A precise description of the location and construction of the percolation test <br />hole is included in Appendix C (EHD form 42-03 revised 11/02/2009). The soil suitability <br />study was conducted within the area of the proposed septic system leach field. <br /> <br /> <br />6.1. NUMBER OF PERCOLATION TESTS PERFORMED <br /> <br />One shallow percolation test was performed at the site. The appropriate percolation test <br />procedure established by the EHD was followed for the test (Procedure #2). The <br />percolation test hole was pre-soaked overnight for 24 hours followed by a four-hour <br />percolation testing period. <br /> <br /> <br />6.2. CONSTRUCTION OF PERCOLATION TEST HOLE <br /> <br />On 23 August 2021, one boring was advanced for a shallow percolation test. The boring <br />was advanced using a four-inch diameter hand auger to a depth of 42 inches bsg. <br />Following borehole advancement, the sides of the boring were scraped, and loose <br />material was removed from the borehole. Once the borehole was cleared of loose <br />material, two inches of fine gravel was added to the bottom of the borehole and a two- <br />inch diameter polyvinyl chloride (PVC) casing with 0.020-inch slots was installed in the <br />borehole to perform the test. Gravel was added to the annulus of the borehole, between <br />the borehole and the casing. The borehole was then filled with water to a depth of <br />12 inches above the gravel at the time of 0800. The test hole was then covered for <br />24 hours to allow for complete saturation of the borehole. <br /> <br /> <br />6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK <br /> <br />On 24 August 2021, the boring was found to be completely dry, intact and in good <br />condition. <br /> <br /> <br />6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 <br /> <br />The work was performed in accordance with San Joaquin County Division 11 <br />Section 9-1105.2 (d) General Requirements. <br /> <br />On 24 August 2021, Percolation test procedure #2 was performed by adding water to <br />approximately six inches above the gravel and recording the amount of water remaining