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i_.., •.may �. - , 7 2 L7�emt+et t t.,�Ot)� Job Numbcr. LGV-213 Fuge R The method utilizod in this analyiis is based on a simple mass balanac formula discussed in a published articic;in Ground Water by Hantzsc:he and Finncmorc.' This method provides a �. convenient and simplified me¢hod to estimat>"long-tarn ground-water nitrate impacts on an area- w6dr basis. iiantzsche and Firuxm � orc have found over a long period of tribe_ water quality in the upper saturated ground-water r.Crne closely approximates the quality of perwlating rcchargc - «atter. Tlycy have found that flie=r approach is a unc3d planning tool stud provides useiiil inrormation to plannersand local nf'ficials but with some real limitations. In Hantzschc and rennemore's article, they menzin i that"._the equat9on Ignores dispersion, laterad flow,and mixing with ground water flow from up-gradient areas_ Thcsc processes would gencrally �-. contribute.to additinnal reduction of nitrate-nitrogen tcmccnt6tions in ground water to the extent t that the nitrate-nitrogen concentration of groamd-water flow forn up-gradiatt areas is loular." The Hant7sche and Fcnncaiore equation'provides"...a aoaservative(worst cmc) first ' approximation of ground-water nitrate-nitrogen concentration resulting froth the comhincd effort of on-site sewage disposal systems and precipitation. This((he equation and approach)is for t" estimation of long-tenn effect(3.e., over years)on ground-Wales equality,and is,ncA inlendod for pirwiction of sej-conal changes." The Haoti-sxhr and FecwernoW equation takes into account developmcnnl arca, soil denitrification tttc'urr,rainfall volume,rainfall nitrate concentration, the waste-elf lucnl quantity, and wra.5te effluent nitrate concentration_ The formula, assumptions and calculations used for the analysis are shown on Ping R and 9. The waits of nitrate used in the mass hal ante equation are '— nitratc-N whose maximum drinking water contatminate level is 10 mgiL - Nitrates from the Septic System and Rain Fall The average total nitrate conc�entraliun of-the-typical.septic waste is nomraall r considered r to be 45 mglL-N. z Please nate the concentration is not related to the maximum contaminate level foi drinking water of 45 mgfL-NO3. The Phase 11 church facility will eontasitt 249 seats for up to 250 members. The everaje daily tlow Mll vary during the days of the weeks. The optional use of a kitchen facility wac.c onsidercd to estimate the daily flows. The SJC PUSIMID Sewage 5tandatds allows 10 gallons per seat per day for a-church with The average 1iLnbwhe N.N ,Fumemwrc,Ej. L"1.Pm6tcann2 (;,n:i1d-WamT N;trmtr-Nitrogen Impacts. Ground anther,Vol. 30,No.a. s Otis,K.J„>inyk,W.C., 1480.Design manual,om:-,tr .vatiewatcT tm4tma-nt and dupcs.84i ry%L'Crs! U.S. Enviranmenta)Proteetion Agawy, EPA 52511-9"12- (Ser.tinge 104,uble'6•1). . . i ' o