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LIVE OAK GECO ENVIRONMENTAL, INC. 437 VV. Oak St., Lodi, CA 95240 ,:• (209)359-0375 logelodi,com September 21, 2020 Project Number: 20-43 Michael Silva 2800 Mancuso Rd. Tracy, CA 95304 Regarding: Percolation Test APN 212-100-04 12501 W. Platti Rd., Tracy, CA (36.85 Acres) Mr. Silva: Per your request, Live Oak GeoEnvironmental, Inc. (Live Oak) has completed a percolation test for the subject Site. We understand that you are planning to construct a new home on the Site, located at 12501 West Platti Road, Tracy, California (Plate 1). The San Joaquin County Environmental Health Department has requested that a percolation test be completed prior to issuing septic permits, Soil Boring On September 15, 2020, Live Oak excavated a shallow soil boring on the Site for the purpose of conducting a percolation test. The boring was four inches in diameter, 3.25 feet deep, and was excavated by hand auger. The location of the boring is indicated on the attached Plate 2. Soil Log The soil in the boring was observed to be silty organic clay to a depth of 2.5 feet below ground surface, followed by fine sand to the full depth of the hole. Preparation and Presaturation of Percolation Test Hole After the shallow boring was advanced by hand auger, the test hole was completed for the percolation test. Approximately two inches of pea gravel were placed in the bottom of the open soil boring, followed by a 2.0-inch diameter PVC pipe with perforations on the bottom. Pea gravel was then used to backfill a few inches of the annular space. Live Oak presaturated the percolation test hole approximately 24 hours prior to the percolation testing. The hole was filled with water to a height of 12 inches above the bottom of the boring for the presaturation. On the day of testing, the hole was found to be intact and dry. Environmental Engineering Geology r Geophysics