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KLEINFELDER These retests were performed on June 13, 2003, in accordance with accepted guidelines using clear potable water. The procedure calls for first placing about 2 inches of fine gravel at the bottom of the borehole. The hole is then pre-soaked with water at least 24 hours prior to performing the test. The 3.5-foot deep test was performed by adding about 6 inches of water above the gravel in the hole. The deeper test was performed by adding up to about 3 feet of water above the gravel. From a fixed reference point, the drop in water level was measured at approximate 30-minute intervals for four hours, refilling as necessary to maintain the prescribed amount of water over the gravel. Under the observation of an Environmental Health Specialist from the San Joaquin County, Environmental Health Department (SJC/EHD), the last 30-minute reading of the four-hour period was recorded and used to calculate the percolation rate in minutes per inch. The estimated percolation rates are summarized below. A copy of our field percolation test results is attached. TesfNumlerg ' De' th;feet Percolation Rate miri/inch". Parcel 2(second retest) 3.5 125 Parcel'2 (second retest) 19.8 8 The results of our percolation retests indicate that a suitable soil percolation stratum exists at a depth of about 20 feet at the location tested in the second parcel 2 retest. A suitable soil condition is defined as a stratum capable of percolating water at a rate of 60 minutes per inch (min/inch) at a depth of 3.5 feet or 30 min/inch for deeper tests. The results of our percolation tests indicate that a conventional septic tank/leach trench sewage disposal system with seepage pits should adequately serve this parcel. The seepage pits should extend to the sandy soils underlying the site that were encountered at a depth of about 20 feet below site grade. It was assumed that the percolation test results are representative of the subsurface conditions in the general area. This completes the scope of work requested. Our work was performed in general accordance with the.standard of care that exists in San Joaquin County. We note that the Limitations section of our original report still applies. No other guarantee or warranty, expressed or implied, is made. Respectfully submitted, �o q?,OFESS/��gl KLET ELDE ��Q �� 1 a!/> F Reviewed by: 1 a � N0.64089 z z `U.A 0 EXF?9-06CP ��r„ � d' Ronald . Lo tzenhiser, C. 9 �1Vi� ��P Ron Heinzen, G.E. Staff Professi nal OF CAL1F0 Senior Principal REL:lr Attachments 22276.G02/ST03L327 June 16,2003 ©2003 Kleinfelder,Inc. Page 2 of