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- <br /> - July-21, <br /> a FOR Mr. Mike Huggins,�REHS,RDI, Land-Use"Program Supervisor. <br /> San Joaquin County Environmental Health Department - <br /> 4 - <br /> a <br /> - :304 East Weber,Ave. <br /> Stockton' CA 95202: <br /> - -- PROJECT 31-71.7 South Chrisman Road,Tracy <br /> 'Lan(f Use Application#PA0400661' <br /> 'SUBJECT: Soil Suitabili"itrateWLoadi-g Studies Addendum - - - <br /> Reference is made to the Studies conducted for the project at 31717 South Chrisman Road. It has been ~ <br /> requested that the nitrate loading calculations for septic system impact from the project be completed <br /> using.the anticipated `_`leased acreage"-of 2 acres out of the 40_acres each proposed parcel will t" <br /> constitute. The original calculations using a total of 444 acresas the land base of the entire project - <br /> demonstrated a resultant effluent.nitrate-nitrogen concentration of I'S ppm. The calculations using 22 <br /> acres(2 acres x 11 parcels-LL22 acres)is illustrated below..The resultant recharge effluent within this ' <br /> area will now be double the MCL of 1'0 ppm nitrate-nitrogen: <br /> Hant ,sche/ 41211emore.Equation <br /> INW(L-d)+RNe <br /> Where: - <br /> Nr= Resultant average concentration of nitrate-nitrogen in recharge`water ppm NO'-N. <br /> I . = Volume rate of wastewater entering the soil averaged over the gross developed area in <br /> inches per yr..:Total wastewater volume:490 gals/house x 22 Houses (includes second unit <br /> dwelling)=-10;800 gpd x 365 days/year=3;942,000 gals= 7.47 gals per ft' =528,000 cu ft of: <br /> wastewater._:Does not account for Eva notranspiration. <br /> } <br /> ` Nw= Total nitrogen concentration of wastewater at 56 mg IV/L. Does not account for loss of nitros in { <br /> se tic tanks (.10%) or through biomat(10%±). - <br /> d Fraction(%)`of nitrate-nitrogen loss due to denitrification iri the soil'(15%+) - <br /> R = Average recharge rate of rainfall-9 inches per yr .. _ _ <br /> Nb Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater <br /> influences(Ppm NO3-N) <br /> Values and Assumptions:` <br /> _ Page 1 of_2=_ - <br /> - P. O. Box3794 7urloc( CA 95381 :Office - - <br /> (209)668-1403 4 g 209 <br /> . �( )668- <br /> 2598 <br />