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Mr. Ray Borges
<br /> Page 2 �. �...:
<br /> April 22,2002
<br /> Calculation of Volume of Deep Percolation of Rain:
<br /> 6.84-in (rain) x 28.40-ac x 1-ft/12-in x 43,560-sf/1-ac x 7.48-gal/cf=5,274,516 gal (rain)
<br /> 5,274,516 gal (rain) x 3.785 L/gal= 19,964,043 L (rain)
<br /> Revised Nitrogen Balance (Table 9 in Report).
<br /> Sources: Deep Percolation of Rain, Septic Effluent and Process Wastewater.
<br /> 1) Nitrogen Sources: Rain,Septic,Process Wastewater
<br /> Concentration Weight
<br /> Volume Volume As Nitrogen As Nitrogen
<br /> (Gallons) (Liters) (Milligrams/Liter) (Milligrams)
<br /> Rain: 5,2 74,516 19,964,043 0.17 3,393,887
<br /> Septic: 415,661 1,573,277 35 55,064,691
<br /> Wastewater: 5,509,487 20,853,408 6.71 139,926,370
<br /> Total(Liters): 42,390,728 Total(Milligrams): 198,384,948
<br /> Result
<br /> Milligrams/Liters= 4.68 mg/L No Denitrification
<br /> Milligrams/Liters x(1-0.25)= 3.51 mg/L With 25%Denitrification
<br /> Revised Nitrogen Balance(Table 10 in Report)
<br /> Sources: Deep Percolation of Rain and Septic Effluent (No Process Wastewater).
<br /> 2) Nitrogen Sources: Rain and Septic
<br /> Concentration Weight
<br /> Volume Volume As Nitrogen As Nitrogen
<br /> (Gallons) (Liters) (Milligrams/Liter) (Milligrams)
<br /> Rain: 5,274,516 19,964,043 0.17 3,393,887
<br /> Septic: 415,661 1,573,277 35 55,064,691
<br /> Wastewater: -- -- -- --
<br /> Total(Liters): 21,537,320 Total(Milligrams): 58,458,578
<br /> Result:
<br /> Milligrams/Liters= 2.71 mg/L No Denitrification
<br /> Afiilligrams/Liters x(1-0.25)= 2.04 mg/L With 25%Denitrification
<br /> The 6.84 inches of deep percolation of rain results in a slight increase of nitrogen
<br /> concentration in both scenarios when compared with Tables 9 and 10 in the subject report. The
<br /> increase is due to the loss of the estimated deep percolation of rain volume for the site. The
<br /> resulting concentration from the revised calculation is well below 10-mg/L-N. Therefore our
<br /> conclusions and recommendations for the project remain unchanged.
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