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11 . <br /> K L E I N F E L D E R <br /> 1 <br /> Nb = Background nitrate nitrogen concentration of rainfall recharge at the water table = <br /> 1.0 mg/l (typically ranges from 0.5 to 1.0 mg/l per abstract titled "Predicting <br /> Ground-water Nitrate Nitrogen Impacts"by Hantzsche and Finnemore (1993)) <br /> Our calculation is as follows: <br /> N, = 2(2)(35)(1 —0.35) 12.33(1.0) = 91 + 12.33 = 6.33 mg/l as N <br /> 2(2)+12.33 4+ 12.33 <br /> CONCLUSIONS <br /> Based on the above evaluation, we conclude that wastewater produced by the proposed residence <br /> and a second residence on the property should not cause the nitrate levels in groundwater below <br /> the site to rise above the state standards. Furthermore, the results of our percolation tests indicate <br /> that a conventional septic tank/leach trench sewage disposal system draining to seepage pits <br /> should adequately serve the proposed residence. As an alternative to seepage pits, disposal <br /> ' trenches could be cut deep to intercept the percolating sand stratum encountered at a depth of <br /> about 15.5 feet. <br /> ii LIMITATIONS <br /> �I The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development and on the site conditions. It was assumed that the percolation test results <br /> are representative of the subsurface conditions in the general area. <br /> i <br /> This completes the scope of work requested. Our work was performed in general accordance <br /> with the standard of care that exists in San Joaquin County. No other guarantee or warranty, <br /> expressed or implied, is made. <br /> Respectfully submitted, <br /> KLEINFELDER,INC. <br /> �O FEsg��y <br /> Ronald E. Loz rihise <br /> Staff Engi r <br /> No 2283 m <br /> t f (P9��C <br /> eotec al Department Manager - <br /> REL:l Attachment cc: SKW and Associates <br /> a <br /> 20-4684-01.6011201181570 December 20,2001 <br /> ©2001 Kleinfelder,Inc. Page 4 of 4 <br /> i <br />