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Table 4, Preapplicatiou Report (continued) <br />Sludge Loading Calculations <br />(D) Sludge/Sand Mix Loading Limits for an Example Field <br />Alfalfa N Demand = 375 lbs/acre <br />Truck and Trailer = 46300 lbs/load = 23.15 tons/load (wet basis) <br />35 cubic yards/load <br />Field Size = 80 acres <br />Per -acre Loading <br />Rate for Sludge - <br />Sand Mix = N Demand of Crop / Available N Concentration in Sludge -Sand Mix <br />10.8 moist tons/acre <br />in truckloads = Loading in (moist tons/acre) / (tons of sludge -sand mix/truckload) <br />= 0.5 truckloads/acre <br />ier Nutrient = Content in sludge(mg/kg) x (100 -%sand) / 100 x 907(kg/ton) / 454000(mg/lb) <br />and Heavy x Sludge loading rate(tons/acre) x (% Solids) / 100 <br />Metals Loadings <br />(lbs/acre) <br />Cumulative Loading Limit / Current Loading Rate <br />Site Lifetime, <br />Based on Current <br />Application Rate <br />Constituent <br />Current Annual <br />Loading Rate <br />Loading Limit <br />Criteria <br />Annual Cumulative <br />Approx. <br />Site Life <br />at Current <br />Rates <br />(lbs/acre) <br />Obs/acre) (lbs/acre) <br />(years) <br />Phosphorus = <br />471 <br />na na <br />na <br />Potassium = <br />70 <br />na na <br />na <br />Cadmium = <br />0.06 <br />0.45 17.8 <br />308 <br />Copper = <br />10 <br />na 446 <br />46 <br />Lead = <br />0.94 <br />na 714 <br />761 <br />Nickel = <br />0.71 <br />na 179 1 <br />251 <br />Zinc = <br />14 <br />na 893 1 <br />62 <br />= not <br />9/13/94 <br />