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/ KL E/NFEL DER <br /> ' \ Pepht ACOCc AOI't So'v.in. <br /> J/ <br /> Average recharge rate of rainfall = 11.2 inches per year (representing 80 percent of <br /> the average annual rainfall of approximately 14.0 inches. The remaining 20 percent <br /> R = <br /> of rainfall is assumed to drain off-site into natural or manmade drainages or be lost <br /> to evapotranspiration.) <br /> Background nitrate nitrogen concentration of rainfall recharge at the water table = 0.5 <br /> Nb = mg/I (per Technical Memorandum, Hydrologic and Soil Investigation for the Chico <br /> Urban Area, page 6, Dames and Moore, April 1996) <br /> Our calculation is as follows: <br /> 3.54(45)(1-0.25) + 11.2(0.50) = 8.49 mg/I as N <br /> Nc _ <br /> (3.54 + 11.2) <br /> Given the above factors, we estimate that the existing and proposed facilities within the parcel <br /> would require an average waste/sewage flow of about 3,360 gallons per week (32 <br /> employees/customers) in order to exceed the state drinking water standard for nitrogen (N) of 10 <br /> mg/I in groundwater. • <br /> 20173772.001A/ST017R57809 Page 11 of 15 April17, 2017 <br /> ©2017 Kleinfelder www.kleinfelder.com <br />