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kTj K L E I N F E L D E R <br /> The percolation tests were performed on August 28 and September 9, 2002, in accordance with <br /> accepted guidelines using clear potable water. The procedure calls for first placing about 2 <br /> inches of fine gravel at the bottom of the borehole. The hole is then pre-soaked with water at <br /> least 24 hours prior to performing the test. The test is performed by adding up to a maximum of <br /> 24 inc es ater above the gravel in the hole. From a fixed reference point, the drop in water <br /> level is measured in approximately 30-minute intervals for four hours, refilling as necessary to <br /> maintain the prescribed amount of water over the gravel. Under the observation of a sanitarian <br /> from the San Joaquin County Public Health Services, Environmental Health Division <br /> (SJCPHS/EHD), the last 30-minute reading of the four hour period is, recorded and used to <br /> calculate the percolation rate in minutes per inch. The estimated percolation rates are <br /> summarized below. A copy of our field percolation test results signed by a representative from <br /> SJCPHS/EHD is attached. The August 28 inspection was performed by Steven Shih and the <br /> September 9 inspection by Johnny Yoakum. <br /> Test Number Depth, ft. Percolation Rate (min./inch) <br /> Parcel 1 P-3 10 28 <br /> Parcel 2 P-4 23 23 <br /> Parcel 3 P-4 15 12 <br /> Parcel 4 P-1 25 5 <br /> It was assumed that the percolation test results are representative of the subsurface conditions in <br /> the general area of the test. ased on these results, it is our opinion that a conventional system <br /> with seepage pits at the end of leach line can be used on this property. Due to the variability of <br /> the soils encountered at this site, we recommend that seepage pits extend 25 feet below grade. <br /> This completes the scope of work requested. Our work was performed in general accordance <br /> with the standard of care that exists in San Joaquin County. No other guarantee or warranty, <br /> expressed or implied, is made. <br /> Respectfully submitted, <br /> KLEINFELDER, INC. <br /> Ronald E. Loutzenhiser, C.E. <br /> Staff En ' eer <br /> Ron Heinzen, G.E. <br /> Senior Principal g No."tae 7 <br /> REL:lr Attachments i} f1p. 3-31-03 <br /> 4 r <br /> 20744.G01/ST02R522 September 20,2002 <br /> ©2002 Kleinfelder,Inc. Page 2 of 2 <br />