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September 30,2002 <br /> Job Number:LG02-335 <br /> Page 11 <br /> ` regarding the requirements for the manure pond abandonment. The environmental condition and <br /> nitrate level of the ponds were not investigated as part of the scope of this study. <br /> Nitrate Loading Analysis <br /> The nitrate loading analysis is the estimate of the nitrate concentration of percolating <br /> �( water generated from septic systems, actual rain infiltration, and other sources over along period <br /> of time. The nitrate loading study for this project includes the existing 3 bedroom residence and <br /> a legal second dwelling unit(SDU)which could be built in the future on the 9.78 acre parcel. In <br /> �— addition,the nitrate loading analysis includes the about 4.94 inches of rain percolation. Nitrates <br /> from chicken manure is not included in the calculation because the manure will be hauled off <br /> site. Nitrates from fertilizers are not included because an assumption is that the orchard is <br /> probably managed properly. <br /> Based on all these assumptions, the result of the nitrate analysis indicated that the Nc <br /> value is 5.31 mg/L. The water quality goal of less than 10 mg/L (Nc) is desirable for the <br /> percolating effluent on the parcel. A summary of the nitrate loading analysis is presented next. <br /> Table 7. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result(mg/1,N)Nc* Acres Quantity Effluent Denitrification Rainfall <br /> (galtday) Concentration (%) Infiltration <br /> (mY/L N)* (in) <br /> 5.3 1,(Plate 9) 9.78 525 45 10 4.94 <br /> 'Note:Maximum contaminate level(MCL)for Nitrate is 10 mg/L-N and 45 mg/L as NO,. Please note that the <br /> average septic waste water level of 45 mg/L-N is not related to the nitrate drinking water MCL of 45 mg/L as NO,. ,it <br /> SDU is Second Dwelling unit containing up to 2 bedrooms. _ <br /> VIII. CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, a satisfactory percolation rate was achieved on the parcel. No ground water <br /> was encountered in the shallow boring drilled to a maximum depth of 3.0 feet. The depth to <br /> ground water during Fall 1998 and Spring 1999 period ranged between 22 to 25 feet below the <br /> L ground surface. The ground water flow direction is generally toward the north ranging between <br /> 3.3 to 3.8 feet per mile during the Fall 1998 and Spring 1999 period. <br /> oeRs 4 <br /> r <br /> e � <br />