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09 '07/2001 10:36 6842627 OBRIENICLAYBAR PAGE M <br /> ICLEINFELDER <br /> The percolation tests were performed in accordance with accepted guidelines using clear potable <br /> water. The procedure calls for first, placing about 2 inches of fine gravel at the bottom of the <br /> bone hole- The hole is then pre-soaked with water at least 24 hours prior to performing the test. <br /> The test is performed by first adding 5 to 12 inches of water above the gravel. From a fixed <br /> reference point,the drop in water level is measured in approximately 30 minute intervals for four <br /> hours, refilling as necessary to maintain about 6 to 12 inches of water over the gravel. Under the <br /> observation of a sanitarian horn the Sara Joaquin County Public f-leaith Department. the last 30 <br /> I minute rcading of the four hour period is recorded and used to calculate the percolation rate in <br /> minutes per inch. The estirnated percolation rates at each test aocation are as summarized below. <br /> A copy of our field percolation test results is attached. <br /> 'fest Number Depth,pt, Percolation Rate MnAnch <br /> P_1 24 30 <br /> P-2 v 10 No percolation <br /> P-3 20 1.5 <br /> P-4 15 30 <br /> P-5 5 8.6 <br /> P-6 20 15 <br /> P-7 19.8 10 <br /> P-S 15 30 <br /> P-9 5.4 No percolation <br /> P-i 0 20 Na percolation <br /> P-11 19.75 20 <br /> P-12 8 3D <br /> P-13 14.9 15 <br /> P-14 15 30 <br /> B-2 15.8 7.5 <br /> P-15 12.5 10 <br /> P-15 17 5 <br /> M <br /> NITRATE LOADING CALCULATIONS <br /> Per San Joaquin County Public Health Services (SJCPHS) Department Enviranroo ntal Health <br /> Division (PHSIEH13) requirements,the fbllowirag summarizes our nitrate loading calculations for <br /> the proposed leach fields- The drinking water standard for nitrate is 45 Milligrams per liter <br /> (NO3)and 10 mgll as Nitrogen(N) in groundwater. In our evaluation of nitrate loading,we have <br /> used the Hantzsche mass balance equation (source: predicting; Ground-Vater Nitrate-Nitrogen <br /> Impracts, Hantzsche and Finnemore (1992)), which is presented below with an explanation for <br /> each factor and the value used in our study. <br /> 24-4476•0I.GOM000R823 Septernbr r 14,2DDO <br /> 0 2400 Ki¢infeWer.lne. page 3 of 5 <br />