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April 1.51 5.10 0.17 <br /> May 0.71 6.82 0.22 - <br /> June 2.09 7.80 0.26 - <br /> July 0.28 8.68 0.28 -- <br /> August 1.05 7.75 0.25 - <br /> September 0.84 5.70 0.19 -- <br /> October 1.06 4.03 0.13 -- <br /> November 2.10 2.10 0.07 -- <br /> December 2.38 1.55 0.05 0.83 <br /> TOTALS(in.) 1 13.18 57.0 ------ 2.21 <br /> Table 5 illustrates that evapotranspiration exceeds precipitation, even when using higher rainfall data that <br /> exceeds normal rainfall data by 28%(10.33 in.vs. 13.18 in.). The Table also illustrates that during the <br /> months of December and January and possibly November and February,deep percolation potentially <br /> occurs. This data also illustrates a relatively high potential for there to be significant evapotranspiration <br /> from the primary disposal area. <br /> III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER CHARACTERISTICS AND FLOW VOLUME PROJECTIONS <br /> WASTEWATER CHARACTERISTICS <br /> The wastewater characteristics are anticipated to be those normally found in typical domestic or household <br /> systems. The scientific literature(Ref. 10)cites domestic wastewater nitrogen concentrations of 35 mg/L N. <br /> This concentration will be used in the calculations below and will be adjusted based on scientific data and <br /> the recommendation of installing a 2000 gallon septic tank in lieu of a required 1200 gallon tank. <br /> WASTEWATER FLOW VOLUME PROJECTIONS <br /> To determine nitrate-nitrogen loading from any project,wastewater flow volumes must be determined as <br /> accurately as possible. Domestic flow volume projections are typically approximated from the USEPA <br /> Onsite Wastewater Treatment Systems Manual,Pg. 3-4. However, for nitrate loading calculations,the EHD <br /> now wants wastewater flow volume projections from single family residential structures to be calculated as <br /> follows: 100 gallons per day(gpd)for the first bedroom and 50 gpd for all subsequent bedrooms within the <br /> structure. Therefore,the flow volumes for this project are: <br /> 4 Bedroom existing structure: 100+50+50+50=250 gpd. <br /> 3 Bedroom proposed structure: 100+50+50=200 gpd. <br /> Total Wastewater Flow Volume: 250+200=450 gpd. <br /> 5 <br /> Chesney Consulting <br />