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_ August 31, 2004 <br /> NOA Project Number: E04060A <br /> Page 15 <br /> 7.4 Agricultural Contribution <br /> Mr. Alegre indicated on August 26, 2004 that he will most likely develop the Site in stages <br /> (personal communication). It is possible, therefore, that portions of the Site will be used for <br /> agriculture during the development process. Because the final Site uses do not include <br /> agriculture, however, no agricultural contribution was included in the nitrate loading <br /> calculation. <br /> — 7.5 Nitrate Loading Scenario <br /> The nitrate loading scenario utilizes the variables discussed previously which represent the <br /> estimated conditions and uses associated with this project. Because the specific future uses of <br /> the Site are unknown, the maximum average daily flow for the Site has been used (section 7.1). <br /> The nitrate loading calculation for this project can therefore be considered a "worst-case" <br /> scenario. The following table presents a summary of the nitrate loading calculation. <br /> Table 7. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Calculation Result Acres Average Effluent Leachfield Deep <br /> (Nc) (A) Daily Flow Concentration Denitrifi- Percolation of <br /> (Q)(Table 2) (Nw) cation(d) Rainfall(R) <br /> (Plate 9) <br /> see Plate 10 1 9.9 m /L-N 1 44.59 1 6,600 gpd 45 m /L-N 1 10%% 1 6.84 in <br /> * Maximum contaminant level (MCL)for nitrate in drinking water is 10 mg/L-N. <br /> _ Based on the method and assumptions described, the result of the nitrate loading balance <br /> indicates that the proposed development will not cause a build up of nitrate in ground water <br /> above 10 mg/L-N over the long term if the average daily flow does not exceed 6,600 gpd. <br /> 15 <br />