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VALLEY AG <br /> R E S E A R C R � <br /> �i JUL - 5 2001 <br /> ENVIn�k-l9 ;-EALTH <br /> June 12, 2001 PER"! ` ^„>i;'ES <br /> FOR: San Joaquin County Environmental Health Department <br /> Mr. Mike Huggins, R.E.H.S., R.D.I. <br /> 304 East Weber Avenue <br /> Stockton, CA 95202 <br /> PROJECT: LA-00-57. Property Address:18404 South North Ripon Road. SR#0026115 <br /> SUBJECT: Nitrate Loading Study -Report Addendum <br /> INTRODUCTION <br /> Reference is made to my Nitrate Loading Study/Soil Suitability Study (NLS-06.00) dated <br /> November 1, 2000. On June 12,2001, 1 received a request by the San Joaquin County <br /> Environmental Health Department dated June 8, 2001 for additional information. According to the <br /> San Joaquin County Development Title, Section 9-830,two residences may be built on a single <br /> parcel. The calculations in my Study for nitrate loading originating from the proposed septic <br /> systems address one house per parcel. Consequently,the nitrate loading must now be calculated <br /> for the potential of two houses per parcel. <br /> REVISED NITRATE LOADING CALCULATIONS <br /> As stated in the initial Nitrate Loading Study, it is my opinion that the Hantzche/Finnemore <br /> equation is the most applicable method to quantify to nitrate-nitrogen loading for the project. <br /> Therefore, this equation will be used to assess the possibility of 16 houses within the proposed <br /> project. This represents the "worst-case scenario,” which must be anticipated. The data used in <br /> the original study will be used again in the following calculations. <br /> HA NTZSCHEIFINNEMORE EQUATION <br /> Ljw(1 - d)+RNb <br /> Nr= (I + R) <br /> Where: <br /> Nr= Resultant average concentration of nitrate-nitrogen in recharge water- (ppm NO3-N) <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area in <br /> inches per yr <br /> Nw= Total nitrogen concentration of wastewater in N mg/L (66 mg N/L/day) <br /> d = Fraction (%) of nitrate-nitrogen loss due to denitrification in the soil <br /> R = Average recharge rate of rainfall - inches per yr(11 inches) <br /> Nb= Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater <br /> influences (ppm NO3-N) <br /> Page 1 of 2 <br /> P.O.Boz 3794 1 Turlock,California 95381 1 (209)668-1403 1 Fax (209) 668-2598 <br />