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' Dec 17 2008 10: 30AM LASERJET 3200 <br /> p. 3 <br /> } <br /> Fdoes <br /> here are changes in flow volumes during any given week for a project, the EI-ID typically <br /> t allow an average daily flow(ADF) to be calculated by dividing the total weekly flow by <br /> days). However, six out of the seven days of any given week, the ADF from the Madina <br /> can be calculated to be: 21 people at each service x 5 services per day x 5 gals/person= <br /> 525 gpd. This is approximately 3x less than the maximurn ADF which will occur every Friday: <br /> 29S people x 5 gabs/person x 1 d/week(Fridays)=:1;475 gals. This volume (1,475 gpd)is what <br /> the septic system disposal area soils are estimated to receive,every single day, and what the <br /> system has been sized for. <br /> Mr.Estrada has also requested that the nitrate loading calculations be revised to reflect the <br /> anticipated increase in wastewater flow volumes. The original calculations found in the Nitrate <br /> Loading/Soil Suitability Studies document are as follows: <br /> I=109,460alg s=total WA/Yr=14,634 cu ft=2.01 in/yr <br /> r 2.01 Ac x 43,560 sq£t/Ac x (I ft/12 in) <br /> Nw =42 mg NIL <br /> d = Assume 25%due to high fine-grained clay soil throughout soil profile. <br /> R = 15 inlyr. <br /> N,= Assumed to be 0.1 ppm NO3-N <br /> 2.01'in1 r C42 ing NIL 1 - 0.25 + 15 i Y31 x 0.1 m <br /> Nr = (2.01 ie/yr+ 15 in/yr) <br /> I <br /> Nr = 3.8 ppm as nitrate-nitrogen(NO,-N)or 17 ppm as nitrate (NO,) <br /> i <br /> The.revised nitrate loading calculations and subsequent nitrate loading,based upon the increase <br /> from one daily service to five daily services and the addition of approximately 40 students on the <br /> weekends, is now projected to be: <br /> I=261.300 gals=total WW/yr=34,933 cu ft=4.79 in/yr <br /> 2.01 Ac x 43,560 sq fUAc x (1 ft/12 in) <br /> Nw=42 mg NIL <br /> d = Assume 25%due to high fine-grained clay soil throughout soil profile. <br /> R = 15 in/yr. <br /> N,= Assumed to be 0.1 'ppm NO3-N <br /> 4.79 in/ 42 mn N 1 -0.25 + 15 in/yr x 0.1 m <br /> Nr = (4.79 in/yr+ 1.5 in/yr) <br /> Nr'= 7.7 ppm as rittrate-nitrogen(NO,-'N)or 34.3 ppm as nitrate(NO3) t <br /> This revised nitrate loading concentration remains below the MCL drinking water standard of 10 <br /> ppm nitrate-nitrogen, or 45 ppm nitrate. <br /> Page 2 of 3 <br /> Chesney Consulting <br />