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Nw = Nitrate concentration of nitrified leachfield effluent (mg/1) = 35 mg/1 typical <br /> (Hantzsche and Finnemore (1992)) <br /> D = Percent dentrification of leachfield effluent = 0.35 percent (0.1 to 0.35 percent <br /> typical per Hantzsche and Finnemore (1992). 0.35 selected given the large depth to <br /> groundwater(>150 feet)) <br /> R = Annual deep percolation of precipitation (inches) = 7.2 inches (representing 80 <br /> percent of average annual rainfall of 9 inches in project area. Remaining 20 percent <br /> 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/1 (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 = 0.38(2)(35)(1 —0.35)+0.5(7:2) = 17.29 + 3.6 = 2.62 mg/1 as N <br /> 0.39(2)+7.2 0.76 +7.2 <br /> CONCLUSIONS <br /> Based on the above evaluation, we conclude that the nitrate concentration at groundwater caused <br /> by wastewater produced at the proposed concrete batch plant should not exceed state standards. <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. <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 /> �,<a0FE9S/�y <br /> Respectfully submitted, <br /> KLEIN R, c33 <br /> w 2283 <br /> J G+�o)"ce." GPa\{t <br /> OF C NO <br /> cote cal Department Manager <br /> REL:lr Attachment <br /> 13384.G01/2002R270 March 19,2002 <br /> ©2002 Kleinfelder,Inc. Page 3 of 3 <br /> KLEINFELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />