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Mr.Ray Borges <br /> August 30,2002 <br /> Page 3 <br /> • A revised,nitrate loading calculation utilizing the Harxtzsche and <br /> P'inneraore' equation was completed. The calculation considers the full <br /> Phase Mestimates. Plate 2 shows the equation and.calculation. The ' <br /> following tables summarize the'waste water generated for the Phase III <br /> development. , summary of the revised Trate loading calculation and <br /> assumptions are also presented. <br /> phase 1111 Domestic Waste Water. <br /> Effluent usage for <br /> Category each category People per day Effluent quantity per category <br /> Employees 15 gals 30 30 people* 15 gal/persoWday =4510gal/day <br /> Customers 1005 . 14.3(140 weekly) 14._3 people� 10 gal/person/day='141 gai/day <br /> Existing home i 00 gals 3; 3 people.* 100 gal/person/day='300 galla; <br /> Existing mobile. 100 gals .3 3 people: 100 gal/person/day=300 gal/day <br /> home , <br /> Daily now: 1,193 gals/day. <br /> Summ.ary of Revised Nitrate Load in Analysis,phase IM <br /> Effluent <br /> Result - Quantity Co�ncentralion <br /> Rainfall <br /> (mg/kl� Acres (gat day) '(rngAL-N)* Denitrification(%) Inflltratiou(io) <br /> 2.15 • 37.5 1 193 45 <br /> 25' d.$4 <br /> *Note,:Please note that the average septic waste water level,pif 45 mg/L-N is jnoi related to the drinking water MCL <br /> of 45 mgfL as No,, <br /> As a result of the revised nitrate loading'analysis,the use o£the existing and proposed <br /> septic•systems will not cause a bad up Of nitrates above the maximum contaminate level for <br /> , itrates(10 mg/L:N). This opinion is based ori the Hantzsche and Finnemore equation,the <br /> asswiptions discussed within the-original report,and the revised assumptions presented in this <br /> addendunn letter, A build up of nitrates above 10 mg/L-N is unlikely due to the a relative low <br /> daily flow of the system, large size.of the'property,deep percolation of rain,clayey soils,and the <br /> deep ground water depth. <br /> lfantzshe N-N_,Finnemore,E.J. 1991,F?edicating Ground-Water Nitrate-Nitrogen Impacts. Ground. <br /> Water,Vol.30,No.4. <br /> 4 <br /> IlE ' d . 99tiZ 'ON mos9y uosaaPuy '0 1 ! ON W I : 11 ZOOZ ' 9 A&S <br />