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4640 E.Woodward Avenue Addendum-Revised Soil Suitability and Nitrate Loading Study ' Prepared by Kleinfelder,Inc. July 13,2006 I' of 10 mg/L in groundwater. Further, the Kleinfelder, Inc. Study estimated that if a square mile were developed around the site, an average waste/sewage flow of over 8,850 gallons per week would be required to exceed the state drinking water standard for Nitrogen of 10 mg/L in groundwater. Our calculations uses the volume of 4,600 gallons of wastewater per week, along with the ' other parameters specified in the Hantzsche and Finnemore equation: (I+R) Where: ' NC = Average calculated nitrate-nitrogen in groundwater resulting from setic system leach field sources and precipitation—mg/1 ' I = Volume of waste water entering the soil over the property parcel = 1.52 inches per year; calculated as follows: (4,600 gal/wk x 52 wks/year x 0.1337 cubic fugal/ (5.83 acres x 43, 560 sq ft/acre)x lft/12inches ' Nw = Nitrate concentration of nitrified leach-field effluent (mg/1) =45 mg/1 ' D = Fraction of nitrate-nitrogen loss due to denitrification of leach field effluent = 0.2 percent ' R = Average recharge rate of rainfall = 9.2 inches per year (representing 80 percent of the average annual rainfall of approximately 11.5 inches Nb = Background nitrate nitrogen concentration in rainfall recharge = 0.5 mg/1 (per Technical Memorandum, Hydrologic and Soil Investigation for the Chico Urban Area, Dames and Moore (April 1996) Our calculation shows that for the combined flows of temple, home and proposed kitchen is as follows: Nc = 1.52(45)(1-0.2) +(9.2)(0.5) = 5.53 mg/1 as N (1.52 +9.2) ' The nitrate loading for the combined flows is significantly lower (approximately 47%) than the calculated loading by Kleinfelder on the original plan. 5.0 CONCLUSIONS AND RECOMMENDATIONS ' Based on the information provided by the property owner and SJC EHD, GTI makes the ' following conclusions: Ground Zero Analysis, Inc. 4 ' 16232 Nitrate Loading Add 170317.docx