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September 20,2001 <br /> Job:Number: LGOI-098 <br /> Page 10 <br /> Table 7. Total Estimated Effluent. <br /> (see Plates 8 and 9 for calculations) <br /> Period Visitors per period Use per person Quantity(gallons) <br /> i <br /> Monday-Friday 400 people for 3 hrs each 5 gallons per person 400 x 5 x 5 = 10,000 � <br /> day. per day times 5 days. <br /> Saturday 200 people for 3.5 hrs. 5 gallons per person. 200 x 5= 1,000 <br /> Sunday 400 people per service,4 5 gallons per person 400 x 5 x 4—8,000 ' <br /> services per day. times 4 services. <br /> ' Weekly Average: 19,000 gallons <br /> 'k <br /> Daily Average: 2,714.3 gallons l <br /> The following table is a summary of the Nitrate Loading Analysis (see Plates 8 and 9) which considers nitrate 1 j. <br /> sources from septic systems and rainfall. <br /> Table 8. Summary of Nitrate Mass Balance Analysis. J <br /> Result(mg,L-N) Acres Quantity Effluent Denitrification Rainfall l <br /> 10 mg/L-N is MCL for (gal/day) Concentration (%} Infiltration <br /> drinking water. (mg/L-N)* (in) <br /> 25.9 3.5 2,714.3 Standard_septic Native Soil 5.1 <br /> (above MCL) system effluent 15 <br /> level <br /> 45 <br /> 7.5 3.5 2,714.3 Engineered septic Engineered 5.1 <br /> (below MCL) system effluent septic system <br /> level 35 <br /> l7 <br /> *Note:Maximum contaminate level(MCL) for Nitrate is 10 mg/L-N and 45 mg/,L as NO3. <br /> Table 7 presents the results of two (2) scenarios,utilizing a standard septic system and <br /> utilizing an engineered septic system designed to reduce nitrates. As a result of the analysis, a <br /> standard septic system which primarily relies on subsurface disposal through leaching would <br /> probably cause a build up of nitrates above the maximum contarninate level for nitrates (10 <br /> mg/L-N) given the assumptions. A build up of nitrates is estimated to occur because of the <br /> relatively high waste water flows to the septic system and the relatively small amount of yearly <br /> rainfall mixing with the effluent. <br /> i <br /> y <br /> 1 <br /> S <br /> �pEkrO <br /> i I <br />� Z � <br /> Q ~ <br /> E F <br /> �jsoc� <br />