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v M KLEINFELDER <br /> Test Number Depth, feet Percolation Rate minutes/inch <br /> P-lA 3.7 Did Not Percolate <br /> 21 Did Not Percolate <br /> P-2A 3.2 25 <br /> 18.7 Did Not Percolate <br /> P-3A 7.2 Did Not Percolate <br /> 12 18 <br /> Based on the percolation test results and soil types encountered, we do not predict any problems <br /> with the proposed septic systems or foresee the need for engineered or alternative septic systems <br /> on parcels 2, 3, and 4. We do not anticipate any geotechnical restrictions on future type, size, or <br /> location of any additional leach fields/leach fields with seepage pits, as appropriate, on the <br /> subject parcels. In the two locations tested in parcel 1 (P-1 and P-lA), passing percolation rates <br /> were not obtained. Based on our conversations with SJCEHD representatives, three options are <br /> available for this parcel. <br /> Parcel I Options <br /> 1. Use and engineered septic system. <br /> 2. Perform more percolation testing in an attempt to locate an area yielding passing <br /> percolation results. The use of an appropriately designed conventional septic <br /> system would then be acceptable in that location. <br /> 3. Use the existing septic system on the parcel. The existing system is currently <br /> connected to a mobile home being used as an office. If this option is desired, it <br /> would be required to have SJCEHD personnel perform an inspection of the current <br /> system and identify any changes/repairs needed based on the proposed construction. <br /> 7. NITRATE LOADING CALCULATIONS <br /> Per SJCEHD requirements, the following summarizes our nitrate loading calculations for the <br /> proposed leach fields. The state drinking water standard for nitrate is 45 milligrams per liter <br /> (NO3) and 10 mg/1 as Nitrogen (l) in groundwater. In our evaluation of nitrate loading, we have <br /> used the Hantzsche mass balance equation (source: Predicting Groundwater Nitrate-Nitrogen <br /> Impacts, Hantzsche and Finnemore (1992)), which is presented below with an explanation for <br /> each factor and the value used in our study. The selection of parameters was based on previous <br /> studies and investigations performed by our firm and others, San Joaquin County Sewage <br /> Standards, communication with Mr. Mike Huggins with SJCEHD, and information provided in a <br /> report dated March 19, 1997 prepared by the Questa Engineering Corporation and authored by <br /> Mr. Hantzsche for a development in the Stockton area. <br /> N,=AWNw_(1-Dl +MaR <br /> AW+R <br /> 36600.GO1/STO3RI537 October 16,2003 <br /> ©2003 Kleinfelder,Inc. Page 4 of 7 <br />