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J. H. KLEINFELDER & ASSOCIATES GEOTECHNICAL CONSULTANTS • MATERIALS TESTING LAND & WATER RESOURCES 2825 EAST MYRTLE STREET STOCKTON. U 95205-4794 (209) 948-1345 File No. S-2568-5 November 23, 1983 Mr. Dave Olmstead Post Office Box 134 Tracy, California 95376 Subject: PERCOLATION TEST RESULTS SANTOS RANCH UNIT NO. 5 TRACY, CALIFORNIA Gentlemen: In this report are presented the results of our percolation tests for Santos Ranch Unit No. 5 subdivision, to be constructed south of State Highway 205 and west of Hansen Road in Tracy, California. A plot plan and vicinity map showing the approximate location of the proposed subdivision and test sites are pre- sented on Plate 1 of this report. We understand that the proposed Unit 5 will consist of twenty-six lots. The lots are planned to be used as single-family residential units. We have assumed that the proposed construction will consist of one and two-story wood -frame structures. Each lot will have on-site sewage and storm water disposal. Site grading is expected to be minimal with cuts and fills of less than approximately 24 inches anticipated to achieve final grades. Additional details of the pro- posed construction are not known to our firm at this time. The purpose of the percolation tests were to provide part of the design cri- teria for the sewage disposal system for each lot. The scope of our services was outlined in our phone conversation of November 21, 1983. Our services were performed based on your verbal authorization by Mr. Mike Quartaroli. A total of five percolation tests were performed. Each approximate 3 -foot deep, 6 -inch diameter test hole was lined with perforated Orangeburg pipe. The percolation holes were initially filled with water and allowed to soak for a period of 24 hours. The tests were performed by filling the hole with water to a fixed referenced point and allowing the water to percolate for a period of one hour. Each hole was then refilled and the process repeated. The percolation test data is presented on Table L It is currently planned to store and dispose of on-site storm water on the lots. This water is planned to be stored and percolated from shallow ponds, 18 inches deep.