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KLEINFELDER to performing the test. The test is performed by first adding 6 inches of water above the gravel. From a fixed reference point, the drop in water level is measured in approximate 30 minute intervals for four hours, refilling as necessary to maintain about 6 inches of water over the gravel. Under the observation of a sanitarian from the San Joaquin County Public Health Department, the last thirty minute reading of the four- hour period is recorded and used to calculate the percolation rate in minutes per inch. The estimated percolation rates at each test location are summarized below. A copy of our field percolation test results is attached as Plate 6. The original copies of the tests were submitted to the SJCEHD with our 2003 report. Percolation Rate Test Number Lot Number Date of Test Depth,feet minutes/inch P-1 1 10/31/02 3.5 21.7 P-2 1 10121/02 10.1 ✓ 4.2 P-3 2 10/31/02 3.5 12.2 P-4 2 10/31/02 15.4 15.5 P-5 3 10/31/02 3.5 4.0 P-6 3 10/31/02 10.0 25.0 P-7 4 10/31/02 3.5 83.3 rAf I P-8 4 10/31/02 10.0 27.8 ,t/amt 01 P-9 5 10/31/02 3.5 19.2 P-10 5 10/31/02 13.4 8.1 P-11 6 10/31/02 3.5 62.5 ynL P-12 6 10/31/02 10.0 12.5 P-13 7 2/10/03 3.2 27.8 P-14 7 2/10/03 9.0 6.1 P-15 8 2/10/03 3.3 83.3 FAtL P-16 8 2/10/03 19.3 4.3 P-17 9 2/10/03 2.8 DNP* Pm P-18 9 2/10/03 19.2 3.3 P-19 10 1/22/03 3.2 DNP GRIL P-20 10 1/22/03 6.0 8.3 P-21 11 1/6103 3.5 2.9 P-22 11 1/6/03 9.0 21.2 P-23 --i-2--1/6/03 3.3 141.7L- P-24 12 1/6/03 10.1 25.8 P-25 13 1/22103 2.6 DNP {7r 111 P-26 13 1/22/03 14.2 13.2 P-27 14 1/6/03 3.5 10.1 P-28 14 1/6/03 10.0 70.8 P-29 --T5--1/22/03 2.9 35.7 f R l P-30 15 1/22/03 1 7.5 1.4 *Did not percolate 23197.G021ST06R149 February 10,2006 Copyright 2006 Kleinfelder,Inc. Page 3 of 6