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The results for the Annual Rainfall recharge at the site were 3.70 in./year. The nitrate <br />concentration is estimated to be about 1 mg/L-N. (Hantzche and Finnemore, 1992). <br />5.3 Description of all current on-site sources of nitrate to soil and groundwater and the <br />contribution of nitrate load from these sources to the project site: The only source of <br />nitrates existing are the ones derived from any agriculture use and the existing residence. <br />5.4 Discussion of all proposed future on-site sources of nitrate to soil and groundwater and <br />the contribution of nitrate load from these sources to the project site: The existing use for this <br />site is agricultural with a house on the site. Given an existing three bedroom home, it is expected <br />they generate 100 gals/day for the first room and 50 gals/day for every subsequent room. Assuming <br />a new two bedroom home, that would generate a total of 200 gal/day. This project site can sustain <br />that maximum as shown on the included calculations. <br />The average total nitrogen concentration of domestic wastewater is about 20-85 mg/L-N, <br />although 35-45 mg/L-N is a better approximation (Crites and Tchnobanglous). The value <br />selected for this site was 45 mg/L-N. <br />The site will experience a process of denitrification as the soil naturally treats surface material <br />through natural forms. Denitrification is a process that occurs when bacteria uses oxygen in the <br />nitrate (NO3) and release nitrogen (N2) into the atmosphere. Denitrification can be variable to the <br />type of soils, chemical properties, moisture content and other variables. Based on the sandy loams <br />on site and the high percolation rates, this site's soil has low levels of denitrification. It is expected <br />that a site with soil of these characteristics shall have approximately about 10-15% of <br />denitrification. The value used for this site was 5%. <br />5.5 Calculate mass balance of nitrogen loading considering all potential sources identified <br />using Hanztch/Finnemore equation: <br />Using the data mentioned within this report and the attached Soil Suitability Report the mass <br />balance of nitrogen loading for this site was calculated, this was done using Hanztch/Finnemore <br />formula. Based on the Hanztch/Finnemore equation the smallest 80 acre site would contain a <br />Nitrate Load (Nc) of 1.38 mg/L-N. <br />6.0 DISCUSSION OF NITRATE LOADING RESULTS RELATIVE TO THE <br />PROPOSED METHOD OF WASTEWATER DISPOSAL. <br />6.1 Discussion of total nitrate impact from proposed project: Current sources of nitrate to <br />soil and groundwater in the area are derived from agricultural operations. The proposed project <br />plans to subdivide the existing islands into six parcels that are 80 acres parcels and larger. The <br />proposed parcels will be used agricultural. The current use of the site if for agricultural purposes <br />and should therefore not see changes with the subdivision of the parcels. There a no plans for an <br />additional homesite or house to be built on any of the parcels. <br />6.2 Description of the methods proposed to mitigate any known or future impact to soil and <br />groundwater from nitrate, and/or any other constituent of concern, at and/or around the <br />project site: The site should not have a short term impact if no changes are made, but it should <br />be monitored for long term impacts. The proposed method to mitigate the future impacts to the <br />soil and groundwater from nitrates by a home or building will be to create a raised bed onto <br />