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77( ductivity r available (avg water use), QAvE= 1,000 gal/day x 8 houses= 8,000 gals/d ndwater flow(Qgw)_ onductivity of sat. zone) x(i =grad.)x 10 ft (top mixing layer) x 1,329 ft= ft/min(estimated) x(60 min/hr x 24 hrs/day)x 0.00063ftJft x 10ft x 1,329 ftr 100 gals/day over the perpendicular length of groundwater flow. TOTAL PREDICTED NITROGEN CONCENTRATION IN GROUNDWATER UNDER THE EIGHT PARCELS: 334 g N/d- QAvE+Qgw = 334 g N/d- [(8,000 gaud+ 100 gaud) 3.78 L/gal] x 1000 mg/g = 10.9 ppm as NO3-N or 48.5 ppm as NO3 E. AGRONOMIC INPUT IF PROPERTY REMAINED IN AGRICULTURAL PRODUCTION Soil samples obtained from 34-40 inches below grade and used to determine the leachline soil analytical characteristics can be used to theoretically quantify the mass balance of nitrate- nitrogen: Mr. Harris had applied 30 units of N every other year to the grapes and 1800 gals of chicken manure to the almonds, which is equivalent to 115 units of N every year. The following L calculations demonstrate the nitrogen loading from the current agricultural production: Almonds and grapes use an average of approximately 175 pounds of nitrogen per acre,which is the total uptake in the harvested portion. Currently, there is approximately (3 ppm NO3-N x 2 million lbs of soil/Ac= 6 lbs NO3-N/Ac)+ (46 lbs NO3-N/Ac ENR) = 52 lbs of NO3-N/Ac in the project site soils. This indigenous nitrogen amount added to the applied nitrogen amount= 52 lbs N+ 115 lbs N= 167 lbs N available to the crop. Therefore, there is a theoretical deficiency of 175- 167 = 81bs N. �- It is evident from the analytical soil test results that Mr. Harris has applied nitrogen in a careful and effective manner. The low soil nitrogen observed indicates the trees and vines are going into the winter months of dormancy with low soil nitrogen when it is not needed. 10 Nafley Ag Research