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Earth Systems Consultants <br /> A Member of the Earth Systems Group <br /> GEOTECHNICAL ENGINEERING • ENGINEERING GEOLOGY <br /> �- 4529 Quail Lakes Drive, Stockton, CA 95207 (209) 952-6122 Fax (209) 957-4887 <br /> File No. Co-9011-SOI <br /> August 27, 1990 <br /> Mr. Yousif H. Halloum <br /> 246 Sheffield Road <br /> Alameda, California 94501 <br /> Subject: Proposed Gas Station/Mini-Mart <br /> Highway 12 and DeBroggi Road <br /> San Joaquin County, California <br /> SOIL SUITABILITY REPORT <br /> Dear Mr. Halloum: <br /> We are pleased to provide this Soil Suitability Report for your proposed gas station/Mini-mart located <br /> south of Highway 12 adjacent to the proposed DeBroggi Road (APN 055-160-20). The site currently <br /> contains two residential structures and a mobile trailer home as well as vacant land. A corn field <br /> exists on the eastern and most southern portion of the site. <br /> We completed four percolation tests on the subject property on August 22, 1990. Enclosed are our <br /> original field data sheets signed by the San Joaquin County field inspector from the Environmental <br /> Health Services Department who observed our final readings. The approximate location of the four <br /> test holes are also shown on the data sheets. The pertinent percolation test results taken from these <br /> data sheets are summarized below. <br /> Perc9latign Tost Data <br /> Range of Final ( 4 Hr) <br /> Test Depth Percolation Rates Percolation Rate <br /> Test Hole 911 Smiazial (min/in) <br /> P1 5.0' 6-13 8.0 <br /> P2 8.5' 5-17 12.5 <br /> P3 2.8' 8-25 25.0 <br /> P4 3.3" 8-25 25.0 <br /> In addition to the percolation test holes, one boring was drilled to a depth of 20 feet. This boring was <br /> located approximately 30 feet north of test hole P3• The log of this boring is attached. The boring log <br /> reveals that the soil consists of silty sand and sand to a depth of 20 feet. The groundwater table was <br /> located at a depth of 19 feet. <br /> In terms of the San Joaquin County Ordinance Code, Rules and Regulations dated May 23, 1989, the soils <br /> present on the site can be classified as sandy loam with an associated soil factor value of 0.200 <br /> recommended for leach field design requirements. Based on the percolation rates summarized above a <br /> design value of 25 minutes/inch is recommended. <br />