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7. April 25,'2001 Job Nurnber: LG01-098 Page 11 ` Table 6. Sunimary.of Nitrate Mass Balance Analysis. Parcel Result: Denitrification Deep Rain Waste level Rain Quantity Size(ac) Percolating' Factor' 'Percolation to leach field Concentra- of Nitrate tion 7 Effluent Concentration* 2.0 13.$3 mgll-N 25% 2.45 inches 45 mg/1-N 8 0.17 mg/1-N 250 gallday Untreated (1 home), influent ) ; 74-84 0.77 mg/l-N 25% 2.45 inches 45 mg/1-N s 0.17.mg/1-N 250 gal/day, Untreated (i home) influent ' 80.84-. 2.30,mg/1-N 25% 2.45 inches 45!P911-N' 0.17 mg/1-N 1,000, Untreated gal/day influent (4 homes) 3.3 10.0 mg/1-N 25% 2.45 inches 45 in g/l-N s 0.17 mg/1-N- 250 gallday Untreated (1 home) influent *Note:Maximum drinking water standard for Nitrate is 10 rng/L-N.(45 mg/L as NO3).- Xs' O3).As a result of the analysis,-a conventional septic system which primarily relies on • subsurface disposal through leaching would eventually cause a build up of riitrates for the three (3)proposed 2 acre properties above the maximum contaminate level for nitrates 0 0 mg/L-N) given the assumptions. This is primarily due to the low estimated infiltration of rainfall.which Would mix with percolating effluent. If greater amounts of deep percolating rain were to occur in this area, mare mixing and dilution of the percolating effluent'would occur resulting in a'lower overall nitrate concentration of recharging water: y The analysis has shown that the existing residence located on the 74.84 acre site will not k cause a buildup utilizing a standardseptic system and Ieach lines. If all four parcels were viewed. as one 80.84 acre property with four residences (1000 gallons p er day waste flow), then the large acreage coupled with the previously discussed low amount,of infiltrating rainfall would not cause a'build'up of nitrates in the shallow ground water. Furthern analysis has showthat the maximum . fi. development density for the area is about 3-3 acres in size. This means that for a given residence' with 5 persons with the assumptions discussed, -standard leachin s_ Vtie s st ld not ause a build up of nitrates in the.shallow ound water if the develo went density is 3.3 acres or eater irk size M*.. - .