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`,, <br /> February 27,2002 <br /> Job Number: LG02-048 <br /> Page 9 <br /> Table 5. <br /> Summary of Percolation Tests. <br /> Percolation Test No. Test Depth(ft) Percolation Rate(minutes/inch) Comment <br /> P-1,(Parcel 1,2.48-acres) 3 1.5 Passed Test <br /> P-2,(Parcel 2,2.50-acres) 3 <1.7 Passed Test <br /> P-3,(Parcel 3,2.50-acres) 3 <1.7 Passed Test <br /> P-4,(Parcel 4,2.50-acres) 3 <1.7 Passed Test <br /> P-5,(Parcel 5,2.50-acres) 3 <1.7 Passed Test <br /> P-6,(Parcel 6,2.48-acres) 3 1.7 Passed Test <br /> P-7,(Parcel 7,2.17-acres) 3 <1.7 Passed Test <br /> P-8,(Parcel 8,61.28-acres) 3 <l.7 Passed Test <br /> A satisfactory percolation rate is<=60 minutes per inch (drop) per County requirements. <br /> — The tests conducted on the eight (8) acre parcels achieved a satisfactory percolation rate <br /> VII. NITRATE LOADING STUDY <br /> A build up of nitrates in ground water can cause a temporary blood disorder in infants <br /> called methemoglobinemia(blue baby syndrome). Serious and occasionally fatal poisonings of <br /> infants have occurred following the ingestion of water containing nitrate concentrations greater <br /> than 10 mg/1 nitrate as N or 45 mg/l nitrate as NO3. <br /> Because of the concern of nitrate leaching into ground water, a nitrate loading analysis <br /> was required by the County to estimate the average nitrate concentration of percolating water for <br /> the subject parcel. If a site is contributing excess nitrogen to ground water, ground water quality <br /> can be impacted. The nitrate sources considered for this project are percolating septic effluent <br /> from the proposed residences constructed on each of the parcels, agriculture, and deep <br /> percolation of rain water containing nitrate. <br /> The method utilized in this analysis is based on a simple mass balance formula discussed <br /> in a published article by Hantzsche and Finnemore7 that provides a convenient and simplified <br /> 7 Hantzshe N.N.,Finnemore,E.J. 1991,Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground <br /> Water,Vol.30,No.4. <br /> roeRso <br /> t <br /> o � <br /> �j50L� <br />