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File No. 20-3821-O1.G01 h'q K L E I N F E L D E R January 6, 1995 • The aggregate base should be compacted to a minimum of 95 percent of the - maximum dry density as determined by the ASTM D-1557 test method. • The aggregate base, asphalt concrete, and Portland cement concrete pavement materials should conform to the specifications stated in Sections 26, 39, and 40, respectively, of the State of California Standard Specifications, latest edition. • The pavement sections recommendations presented assume that periodic maintenance of pavements will be done, including sealing of cracks. A greater degree of maintenance should be anticipated in the graveled parking area. Consideration should be given to oiling the top surface of the graveled area to reduce the potential for moisture infiltration into the aggregate base. • All curbs surrounding landscape areas should be embedded at least 6 inches i ' below subgrade to reduce the movement of moisture beneath pavements. 6. Percolation Test Results Two percolation tests for use in design of the storm pond basin were performed at the proposed C basin location. Both tests were performed at a depth of approximately 10 feet below the existing ground surface. The approximate locations of the percolation tests are shown on the r' Plot Plan, Plate A-1. The test holes were drilled and cased on November 23, 1994, and the L tests were performed on November 30, 1994. The percolation tests were performed according the San Joaquin County guidelines, using relatively-clean water. The procedure calls for maintaining a head of water of approximately 3 to 5 feet above the bottom of the test holes. We were not able to obtain the desired head in Lboth test holes as the water drained out too quickly. Based upon our observations and test, we estimate that the percolation rate would be greater than 100 gallons per square foot per day for both tests. LThere are many factors that influence storm water disposal. Clean water was used in our tests, E_ whereas, oil residue, silt, leaves, and other deleterious material may be included in the actual L storm water. Variations in soil conditions may also affect percolation characteristics. Assuming that the above percolation rates are representative of the percolation characteristics of the actual retention basin, we recommend an average design percolation rate of Capproximately 50 to 60 gallons per square foot per day at the 10-foot depth be assumed. I%. ADDITIONAL SERVICES The review of plans and specifications, field observations, and testing by Kleinfelder, Inc. are an integral part of the conclusions and recommendations made in this report. If Kleinfelder, Inc. is not retained for these services, the client agrees to assume Kleinfelder, Inc.'s responsibility for any potential claims that may arise during construction. The required tests, I Copyright 1995 Mcinfcldcr, Inc. Page 7 of 9