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June 10,2002 <br /> Job Number:LG02-164 <br /> Page 11 <br /> recommendations, approximately 100-units of nitrogen UN-32 has been applied this year to the <br /> orchard (between January through April, 2002). The fertilizer is liquid based and is applied <br /> through the irrigation system. <br /> Since an agricultural consultant advises Fisher Farms, an assumption was made that the <br /> irrigation, f6rtilization, and uptake of nitrogen by the walnut orchard are considered in balance <br /> (eg: irrigation and nutrients are being consumed by the orchard). An assumption of nitrate <br /> leaching to ground water is minimized due to Fisher Farms use of a l A. <br /> Nitrate Loading Analysis <br /> The Nitrate Loading Analysis and deep percolation of rain estimate was calculated <br /> numerically and is shown on Plates 8 through 10. The nitrate loading analysis considers nitrate <br /> concentrations and quantities from septic waste water and rainfall sources. The analysis was <br /> performed using a denitrification factor of 10% and the Hantzshe&Finnemore equation for each <br /> parcel size. The analysis also assumed that a possible future four(4)bedroom residence <br /> occupied by five(5)persons may be built on the designated remainder parcel and a legal second <br /> dwelling unit consisting of three(3)bedrooms occupied by four(4)persons may be built both <br /> parcels the future. The following table is a summary of the analysis shown on Plates 8 through <br /> 10. <br /> Table 7. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Parcel No. (Plate No.) Parcel Size Result:Average Nitrate Quantity of <br /> Concentration of Effluent <br /> Percolating Water <br /> Parcel 1,Fully Developed 4.91 acres 7.33 mg/L-N 490 gpd <br /> (Plate 9) <br /> Designated Remainder Parcel, 45.09 acre 1.35 mg/L-N 630 gpd <br /> Fully Developed (Plate 10) <br /> Note:Maximum drinking water standard for Nitrate is 10 mg/L-N(45 mg/L as NO ),SDU-second dwelling unit, <br /> gpd-gallons per day. <br /> As a result of the analysis, the property the average nitrate concentration of percolating <br /> water on both parcels is below 10 mg/L-N. This means that if both parcels are fully developed <br /> with SUD's, the long term build up of nitrogen in the ground water is not expected to be above <br /> 10-mg/L-N. The nitrate concentration of 10 mg/L-N (or 45-mg/L-NO3) is the maximum <br /> contaminate limit for safe drinking water. <br /> ?pERSO <br /> r ti <br /> D <br /> W <br /> O � <br /> r <br /> �'tSOG\ <br />