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Soil Suitability and Nitrate Loading Evaluation-DRAFT Page 5 of 18 <br /> Great Pacific Nut—Nut Processing Facility Expansion <br /> 3501 Lehman Road, Tracy, California <br /> May 15, 2019 CTE Job#25-0710G <br /> feet bgs. The soil material type presented on the percolation test data sheets represents <br /> the soil material type present at the depth in which the percolation testing was conducted. <br /> Percolation data sheets are contained in Appendix-B. Locations of the all geotechnical �✓ <br /> test borings and percolation tests are shown on the attached "Exploration Location Map" iX <br /> (Figure-2). All test holes were backfilled to ground surface and surface restored to <br /> original condition upon completion of testing. <br /> g'wS� <br /> k � <br /> 7.0 PERCOLATION TESTING <br /> Our subsurface investigation included conducting site storm water disposal and leach <br /> field soil suitability evaluations via percolation testing. The evaluation included the <br /> drilling and testing of three percolation test holes (drilled on March 22, 2019 and tested <br /> on April 9, 2019) at the locations shown on Figure-2. Percolation test P-1 was conducted <br /> at the proposed leach field and was conducted at a depth of 3.0:L feet. Percolation tests P- <br /> 2 and P-3 were conducted in the vicinity of the proposed storm water drainage basin and <br /> were conducted at a depth of 10.0±feet. <br /> 7.1 Percolation Testing Procedure <br /> Upon completion of the percolation test hole drilling, loose material was removed and a <br /> 3-inch diameter open-ended slotted drain pipe was installed to control potential sidewall <br /> caving of the hole. Pre-saturation of the soils to be tested was accomplished by preceding <br /> heavy rains and filling each test hole with water to a level 6 inches above the bottom. <br /> During the pre-saturation period a six inch (minimum) column of water"dissipated" from <br /> P-2 and P-3 within 30 minutes or less, although, did not in P-1. Percolation testing was <br /> then performed immediately by adding water to a level of 6± inches above the top of the <br /> 2 inches of gravel placed at the base of each test hole. <br /> Recordings were made of the change (drop) in water level at regular time intervals and <br /> water level was refilled after each interval. Specific details are included on the attached <br /> percolation test data sheets located in Appendix-B. <br /> SACRAMENTO • FREMONT • MODESTO <br /> INSPECTION&TESTING•GEOTECHNICAL•ENVIRONMENTAL•CONSTRUCTION ENGINEERING <br />