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AP +-� 134ctmber l E, 2002 - Job Nambar LG12-213 1 Page 8 The method utiiirod in this arWysis is based on a simple mass balance formula discussed in a publisbod Miele in Ground Water by.Hantzsehe and Fi6emore.' This method provides a . convenient and simplified medied to estimate long -taxi ground -water nitrate impacts on an area- v6de basis. liaritzsche and Finnetnorc have found over a long Oeriod of time, water gaslity in the upper saturated ground -water zone closely approximates the quality of percolating recharge 1 waters. They, have found that [heli appn=h is a stood planning tool and provides useivl information to planners and local official~ but with sorne real limitations. In flantzscbc and Fennem-ore's article, they mentiati that "._the equation ignores dispersion, lateral flow, and nuxinb with groundwater flow from up -gradient areas. These processes would generally contribute. to a"tiorcal reduction of nitrate -nitrogen tonccntrdtions in grdtu,d water to the extent that the nitrate -nitrogen concentration of ground -water flow from up-Smdient areas is kacr." The Hanvschc and Fcnaeiniore equation' provides "...a conscri ative (worst enc) first 4 approximation of ground -water nitrate -nitrogen concentration resulting from the combined effect of on-site sewage dispersal systems and piccigitation. This ((he equation and approach) is for estimation,of long-term effect O.c., ova years) on ground-ivatet quality, ane! is ntA intended for prediction of seasonal changes." The Hantischc and Fennemore equation takes into account dcvclopmcni arra, soil denitrification Ua' (fr, rainfall volume, rainfall nitrate concentration, the waste effluent quantity, . and waste effluent nitrate concentration- The formula, assumptions and calculations used for the r analysis are shown on Plates 8 and *9. The units of nitrate used in the mass balance equation are '— ttiirato-;t whose maximum drinking water contaminate level is Id mg1L.. _ Nitrates from tilt Septic System and Rain Fall The average total nitrate concentration of -lite typical. septic waste is normally considered to be 45 mgfL-N. ` Please note the ooncentration is not eelatcd to the maximum contaminate level foT drinking water of 45 mg/L-NO3. The Phase li church fatality will contain 249 seats for up to 250 members: The average daily flow wilt vary during the days of the weeks. The optional use of a kitchen, facility wafi.vonsiderod to estimate the daily flows. Tho SX.P11SIEW Sewage Standards allows 10 gallons per seat per day for a•,clturrdi with a The average ' Hadushe N -N , Finn=*=, Fes, 1991, Predicating Ground-watcr'Nitmw-Nitrogen Impacts. Ground water, Vol. 30, No.. 4. R ()ds, Rj., Hoyle, -w -C., 1480, Design mwmai, oarite wastewater Utstmew anal disposal syNtetas.. U.S. Envira dal ¢rwWon A,gcncy, EPA 62511.90-012. ($u+ page