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Van Weerdhuizen Proposal Page 4 <br /> yrs. Consequently, this 30+ yr time frame could lead to the <br /> assumption for a higher nitrate concentration in the underlying <br /> groundwater. It may be theorized that the regionally extensive <br /> hardpan layer found in the Escalon area may be attenuating the <br /> downward migration of nitrate molecules. <br /> By spreading the lagoon soil in the manner discussed in the <br /> proceeding section, this will create a dilution factor for the <br /> nitrate concentration based upon the following data: <br /> Averaging the concentrations of Nitrate Nitrogen (NO3-N) from <br /> each of the three horizon layers of the lagoon area results in 109 <br /> mg/kg of NO3-N. There are . 0000624 lb/cu ft in one mg/kg. <br /> Therefore, there are . 00680 lb/cu ft of NO3-N, on average, in the <br /> lagoon soil . If approximately 91, 000 cu ft of soil is excavated, <br /> then this soil will contain 619 lbs of NO3-N. The lagoon soil <br /> spread over 25 acres will contain approximately 25 lb/ac of NO3-N <br /> or 113 lb/ac of NO3. These calculations do not take into <br /> consideration escape of gaseous nitrogen forms from the nitrogen <br /> cycle, and the use of a portion of the lagoon soil as a road base <br /> for the proposed road on the subject property. This concentration <br /> of 113 lb/ac NO3 would be a manageable amount for utilization by <br /> the existing forage crops based upon data found in Table 4-1 in the <br /> 7th Edition of the Western Fertilizer Handbook. <br /> Respectfully submitted, <br /> QUALITY CON"OL INSPECTION, INC. <br /> Don Chesney <br /> Director, Enviro ental Engineering Division <br /> O ` ulity Control Inspection <br />