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LIVE OAK GEO ENVIRONMENTAL, INC. <br />407 W. Oak St., Lodi, CA 95240 -* (209) 369-0375 •:• logelodi.com <br />AM - <br />April 16, 2021 <br />Project Number: 2116 <br />Albert Rico <br />432 Stanislaus St. <br />Lodi, CA 95240 <br />Regarding: Percolation Test <br />APN 051-250-56 <br />12170 E. St. Rt. 12, Lockeford, CA (22 Acres) <br />Mr. Rico: <br />Per your request, Live Oak GeoEnviron mental, Inc. (Live Oak) has completed a percolation test <br />for the subject Site, located at 12170 East State Route 12, Lockeford (Plate 1). We understand <br />that you are planning to construct a house on the Site, and the San Joaquin County <br />Environmental Health Department is requiring the completion of a percolation test before the <br />septic permit can be issued. <br />Soil Boring <br />In March 2021, you drilled a shallow percolation test boring on the Site with a backhoe - <br />mounted auger; the boring was 12 inches in diameter and 3.25 feet deep. Based on initial <br />percolation rates, a drill rig was retained to complete a deeper boring. On April 8, 2021, Live <br />Oak observed the drilling of a deep percolation test boring by Central Valley Septic Services <br />with a Spiradrill LHD 50 drilling rig. The boring was 12 inches in diameter and 14.21 feet deep. <br />The location of the borings is indicated on the attached Plate 2. <br />Soil Log <br />The soil in the borings was observed to be sandy clay to a depth of 3 feet, followed by a <br />hardpan of silty sand to 5 feet, sandy silt to 8 feet, very fine silty sand to 11 feet, very fine sand <br />with silt to 14 feet, and partially cemented fine sandy silt to the full depth of the hole. <br />Preparation and Presaturation of Percolation Test Holes <br />After the borings were advanced, the test holes were completed for the percolation testing. <br />Approximately two inches of pea gravel were placed in the bottom of each open soil boring, <br />followed by a 2.0 -inch diameter PVC pipe with perforations on the bottom. Pea gravel was <br />then used to backfill a few inches of the annular space. <br />Live Oak presaturated the percolation test holes approximately 24 hours prior to the <br />percolation testing. Each hole was filled with water to a height of 12 inches above the bottom <br />of the boring for the presaturation. On the day of testing, both holes were found to be intact <br />and dry. <br />Environmental Engineering Geology Geophysics <br />