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18 September 2020 AdvancedGeo Project No. 20-6116 An Employee-Owned Company Page 8 of 15 map showing the approximate location of the percolation test holes is provided in Figure 3. A precise description of the location and construction of the percolation test hole is included in Appendix D (EHD form 42-03 revised 11/02/2009). 6.1. NUMBER OF PERCOLATION TESTS PERFORMED Two shallow percolation tests were performed at Parcel 1. The appropriate percolation test procedure established by the EHD was followed for the test (Procedure #3). The percolation test holes were pre-soaked overnight for 24 hours followed by one-hour percolation testing periods. 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE On 09 September 2020, two borings were advanced for shallow percolation tests. The borings were advanced to total depths of 42 inches bsg using a four-inch diameter hand auger. Following borehole advancement, the sides of the borings were scraped, and loose material was removed from the borehole. Once the boreholes were cleared of loose material, two inches of fine gravel was added to the boreholes. The boreholes were then filled with water to a depth of 12 inches above the gravel at the time of 0805 for P-1 and 0840 for P-2. The test holes were then covered for 24 hours to allow for complete saturation of the borehole. 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK On 10 September 2020, the borings were found to be completely dry, intact and in good condition. 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 The work was performed in accordance with San Joaquin County Division 11 Section 9-1105.2 (d) General Requirements. On 10 September 2020, the percolation test holes were dry after sitting overnight. The following percolation test procedures were followed: • For P-1, percolation test procedure #3 was performed by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole at 10-minute intervals for one hour and then at 5-minute intervals for one hour. • For P-2, percolation test procedure #3 was performed by adding water to approximately six inches above the gravel and recording the amount of water remaining in the borehole at 5-minute intervals for one hour.