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Soil Suitability and Nitrate Loading Evaluation Page 6 <br /> U of P-Golf Practice Facility Expansion <br /> 6301 West Eight Mile Road <br /> Stockton, California <br /> May 13, 2019 CTE Job#25-0711 G <br /> underlain by medium dense silty sand (SM) to the maximum depth explored of <br /> approximately 15.0 togs. <br /> 8.0 PERCOLATION TESTING <br /> A percolation testT:2jmas performed on July 31, 2019 within the proposed leach field <br /> area as shown on Figure 2, attached. The field testing was performed under San Joaquin <br /> County EHD "Onsite Wastewater Treatment System Permit" Number SR0080895. The <br /> percolation test was observed by a San Joaquin County EHD inspector and was <br /> performed in general conformance with the San Joaquin County Environmental Health <br /> Department (EHD Document 42-01-002, revised 4/14/2018). Percolation test data is <br /> presented in Appendix B and a copy of the certified field data is included in Appendix D. <br /> 8.1 Percolation Testing Procedure <br /> Upon completion of the 6.0-inch diameter by 36±inch deep percolation test hole drilling, <br /> loose material was removed and a 4-inch diameter open-ended slotted drain pipe was <br /> installed to control potential sidewall caving. Pea gravel was used at the base and annular <br /> space to limit sloughing of the boring walls. Pre-saturation of the soils to be tested was <br /> accomplished by adding water to 12-inches above the base of the test hole 24 hours <br /> preceding the test. After the 24 hour pre-saturation period the 12-inch column of water <br /> had completely "dissipated" from the test hole (P-2). Percolation testing was then <br /> performed immediately by adding water to a level of 6f inches above the top of the 2 <br /> inches of gravel placed at the base of the test hole. Recordings were made of the change <br /> (drop) in water level at regular (30 minute) time intervals and water level was refilled <br /> after each interval. Specific details are included on the attached percolation test data <br /> sheets located in Appendix-B. <br /> 9.0 NITRATE LOADING CALCULATIONS <br /> Per SJEHD requirements, the following summarizes our nitrate loading calculations for <br /> the proposed leach field. The state drinking water standard for nitrate is 45 milligrams <br />