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KLEINFELDER <br /> Nw = Nitrate concentration of nitrified leachfield effluent (mg/1) = 70 mg/l typical (based <br /> on communication with Mr. Mike Huggins with SJCPH/EHD) <br /> D = Percent dentrification of leachfield effluent = 0.25 percent (0.1 to 0.35 percent <br /> typical per Hantzsche and Finnemore Q 1992]). <br /> R = Annual deep percolation of precipitation (inches) = 9.6 inches (representing 80 <br /> percent of average annual rainfall of 12 inches in project area. Remaining 20 <br /> percent of rainfall is assumed to drain off-site into natural or manmade drainages) <br /> Nb = Background nitrate nitrogen concentration of rainfall recharge at the water table = <br /> 0.5 mg/l (per Technical Memorandum, Hydrologic and Soil Investigation for the <br /> Chico Urban Area,page 6,Dames and Moore, April 1996) <br /> Our calculation is as follows: <br /> Nc = 0.418(2)(70)(1 —0.25) +0.5(9.6) = 43.9+4.8 4.7 mg/1 as N <br /> 0.418(2)+9.6 0.836+9.6 <br /> CONCLUSIONS <br /> Based on the above evaluation, we conclude that wastewater from the proposed addition should <br /> not have a nitrate as nitrogen(N) concentration at the groundwater level greater than 10 mg/l. <br /> LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development and on the site conditions encountered. <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 /> �O QPOFESS/0' <br /> KLEINFELDER, INC. j �Q Qt M. Q& <br /> 0rFCHN�GP <br /> Ronald E. Lou enhis r H. ul <br /> �9p <br /> Staff Professional otec is Department Mana C <br /> REL:lr <br /> Attachments <br /> 13257.G01/ST02R023 June 4,2002 <br /> 0 2002 Kleinfelder,Inc. Page 3 of 3 <br />