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Total Dissolved Nitropen <br /> The industry average content of nitrogen in typical domestic wastewater of 35 mg/L is used in this analysis. 10 <br /> Denitrification in the soil <br /> As mentioned above,denitrification is an exponent of soil composition and detention time. The high silty clay content <br /> of the soil will preserve moisture content in the biotic zone and the slowly permeable soil structure will allow for an <br /> extended retention time. It is expected that this site will provide higher than normal denitrification, however, an <br /> average value of 25%reduction in the concentration of nitrogen in the surface soils has been used. <br /> Rainfall <br /> An annual rainfall value for this site was listed as 15 inches per year.11 1z <br /> Nitrop,en concentration of rainfall recharge <br /> This value incorporates the background nitrogen concentration in the local rainfall and shallow surface soils. Our <br /> research did not reveal any documentation of existing nitrate contamination in the local vicinity of this project. As <br /> such, a value of`0' has been used in this assessment. <br /> D. Conclusions <br /> Based on the processing of reasonable data into the Hantzsche-Finnemore model, we find that very little nitrogen <br /> content will reach the underlying groundwater. It appears that the nitrogen increase in the local groundwater beneath <br /> the parcel will be increase by approximately 0.42 mg/L. Based on an action standard of nitrogen levels exceeding the <br /> MCL of 10 mg/L, no pre-treatment of the wastewater is required for this site. <br /> pAEN TA( <br /> e?,���N J. e `'y <br /> N REH�,S#60�D' <br /> EXF.. <br /> Sr�rF Op CA�`�o�`P <br /> 10 Small and Decentralized Wastewater Management Systems,Crites,1998 <br /> 11 NOAA Mean monthly,seasonal and annual pan evaporation for the united states, 1982 <br /> 12 CIMIS website <br /> Applied Wastewater Solutions, Inc. page 4 of 4 <br />