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). H. KLEINFELDER & ASSOCIATES File No. S-2178-6 <br /> October 11, 1984 <br /> Page Two <br /> in the area, groundwater has varied up to within approximately 2 feet of the <br /> surface. This is most likely due to surface elevations that vary throughout the <br /> area. It is possible, however, that groundwater conditions at the site could <br /> vary at some time in the future due to variations in rainfall, groundwater <br /> withdrawal, construction activities, or other factors not apparent at the time <br /> our borings were drilled. <br /> The above is a general summary of the soil and groundwater conditions <br /> encountered in the exploratory borings drilled for this investigation. More <br /> detailed descriptions of the soils encountered in each boring are noted on the <br /> Logs of Borings, Plates R and III. All soils have been classified according to <br /> the Unified Soil Classification System presented on Plate L <br /> Percolation tests were performed by filling the percolation holes to the <br /> surface with water and measuring the rate at which the water level dropped. The <br /> tests were performed for a period of approximately 3 hours. Our test results <br /> indicate percolation rates of approximately 15 to 17 gallons per square foot per <br /> day. <br /> There are many factors. that influence storm drain disposal. Clean water <br /> was used in our tests, whereas oil residue, silt, leaves, and other deleterious <br /> material may be included in the actual storm water. Variations in soil con- <br /> ditions across the drainage pond may also affect percolation characteristics. <br /> Taking into account these factors, we recommend that a Factor of Safety on the <br /> order of 2 be applied to the above values for use in design. <br /> Using a value of 8 gallons per square foot per day, R. W. Siegfried do <br /> Associates' evaluation indicates that at this rate the proposed basin will empty <br /> in approximately three days. This rate is approximately one-third the time <br /> required by San Joaquin County. <br /> If you have any questions or need additional information, please contact <br /> US. <br /> y <br /> Respectfully submitted, <br /> J. H. KKLLEINFELDER be ASSOCIATES <br /> �C�9�t L�lT�1t <br /> Ron Heinzen, C. E. <br /> SR D:rsd <br /> cc: Client (2) <br />