Laserfiche WebLink
Ia 010/028 <br /> 07/10/2006 08:24 FAX <br /> Background nitrate nitrogen concentration of rainfall recharge at the water <br /> Nt, table = 0.5 mgll (per . Technical Memorandum, Hydrologic and Sail <br /> Investigation for the Chico Urban Area, page C, Dames and Wore, April <br /> 1996) <br /> Our calculation that irlciude$ both the proposed temple and the existing home is 0S <br /> follows: <br />` 2.76 ............. <br /> NC ---._-.. ...._.�- ) ......_.-_� ... ....... = 8.7 mgli as N <br /> (216 + 9.2) <br /> Given the above factors, we estimate that the facility would require an average <br /> waste/sewage flow over 14,200 gal./week in order to exceed the state drinking water <br /> standard for nitrogen (N) of 10 m911 in groundwater. <br /> We have also used the Hantzsche mass balance equation (source* Predicting <br /> Groundwater Nitrate-Nitrogen impacts, Hantzsche and Finnemore (1992)), which is <br /> presented below, to help predict the nitrate loading taking into consideration a square <br /> mile 0 development around the proposed Sikh Temple. <br /> I�NW��."� } R{ _ _ AWN, { ...� _(Nh) _ -- <br /> N, -- .._-....._... (I}R) AW + FR <br /> Where• <br /> N„ µ Average calculated nitrate-nitrogen in groundwater resulting from leach field <br /> source and precipitation—mgll, as N. <br /> l volume rate of waste water from the proposed Sikh Temple entering the soil <br /> averaged over the gross developed Sikh Temple area = 2.76 Inches per <br /> year (calculated as follows, (8,400 gallweek x 52 weekslyear x 0.1337 cubic <br /> fugal)/(5.83 ac es x 43,560 sq ft/acre) x 1 f1112 inches.)) <br /> Nw = Nitrate concentration of nitrified leach-field effluent (mg11) = 45 m911 (The <br /> Hantzsche and Finnemore (1992) technical paper indicates that the average <br /> total nitrogen concentration in septic tank effluent ranges form 35 to 45 mgll• <br /> This range was also reported in the 1996 Dames and Moore technical <br /> memorandum. Accordingly, our assumed value is considered conservative.) <br /> D - Fraction of nitrate-nitrogen loss due to dentrification of leach field effluent <br /> 0,2 percent (Per Hantzsche and Finnemore (1992). (3.10 to 0.35 is typical). <br /> The 0-2 value was selected given that groundwater in the project area is <br /> relatively shallow and the subsurface soils are fine grained and will not easily <br /> allow infiltration of effluent to the groundwater <br /> 7132..G011STQ%6RT�F 3tpi g" 2009 <br /> Copyright 2006 Klointeldor,Inc. ping"6 of <br />