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16475 TIDE ROAD Project No.2019-00072 Page 16 auger.A 2.0-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. Approximately two (2) inches of"pea gravel" was placed in the bottom of each of the open soil boring and then the PVC pipe was installed on top of the gravel. "Pea gravel"was then used to backfill in the annular space. Pre-saturation of the percolation test hole occurred approximately 24 hours prior to the day of testing. The depth of water used to pre-soak the shallow test holes was 12 inches above the bottom of each shallow boring.The depth of water used to pre-soak the deep test holes was approximately 6 inches above the selected stratum. After the 24-hour soak period,the pre-saturated hole was found to be intact and dry on the day of testing.The final percolation rates were determined based on the EHD Percolation Test Procedure form 42-01-002, revised 8-23-2011,based on if water or no water remains in the test hole overnight,and supervised under Daria Afonskaia on September 12, 2019 at the time of the percolation test inspection. 6.1 Percolation Test Procedure One percolation test was conducted for the boring on September 12, 2019 in accordance with the requirements of the EHD. A four-hour percolation test was performed for the test. The last half hour of the test was observed by Daria Afonskaia, Registered Environmental Health Specialist, EHD. Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All tabulated values on the field data sheet are in decimal feet. After water drop was observed,the hole was checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the bottom level of the percolation test hole. The readings were taken every 30 minutes for a period of four(4) hours. 6.2 Percolation Test Form and Results The completed percolation test permit and test form are included in the Appendix C of this report. A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop.The percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel to utilize a standard septic system. Details of the percolation test is summarized in the table below. Table 4. Summary of Percolation Test— September 12, 2019 Test No., Percolation Percolation Test Comments Date Tested Test Rate Depth (feet) (minutes/inch) Duration (see notes) 16475 Tide Road P-1 (shallow) 3.42 17.86 4 hours Satisfactory F I Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch and greater than or equal to 1 minute per inch. The soil within the percolation test area for 16475 Tide Road demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. Petralogix Engineering,Inc 26675&cella Road,Galt Ca 95632 (209)-400-5729 www.petralogix.com