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k4 KLEINFLLDLR test. The 3-foot deep test was performed by adding about 6 inches of water above the gravel in the hole. The deeper tests were performed by adding up to about I to 2 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 a sanitarian 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 estimted percolation rates are summarized below. A copy of our field percolation test results is attached. Although three percolation tests were performed, only the first two were signed by a representative from SJC/EHD as the third was not necessary to obtain a passing percolation rate. I-A :Test N.unber' ;w� De `th,`feet ......'..Pexcoiat>ion Rate mar /inch Parcel 2 (retest) 3.1 Did not percolate Parcel 2 (retest) 8.2 19 Parcel 2 (retest) 7.5 13 The results of our percolation retests indicate that a suitable soil percolation stratum exists at a depth of about 8 feet at the location tested in the parcel 2 retest. The results of our percolation tests indicate that a conventional septic tanVleach 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 8 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. No other guarantee or warranty, expressed or implied, is made. Respectfully submitted, �0 QRpFESsi KLEINFELDER, I Nn.Won x z Owl' EV 9-046 x rn * �y Ronald E. outze iser, C.E. 0,9 CIVIL Staff P o essiona a �0 � Ron Heinzen, G.E. Senior Principal OF C At-ft REL:lr Attachments 22276.G02/ST03R844 June 9,2003 ©2003 Kleinfelder,Inc. Page 2 of 3