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PRECIPITATION AND Eto DATA FOR TRACY, CA <br /> June 2.09 7.80 0.26 -- <br /> July 0.28 8.68 0.28 - <br /> August 1.0 5 7.7 5 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.) 13.18 57.0 ------ 2.21 <br /> The Table illustrates that evapotranspiration far exceeds precipitation, even when using higher <br /> rainfall data that exceeds normal rainfall data by 28% (10.33 in. vs. 13.18 in.). Only in the months of <br /> December and January, and possibly November and February would deep percolation potentially <br /> occur. <br /> Since there will be landscaping grass over the wastewater disposal area,this data illustrates a high <br /> potential for there to be significant evapotranspiration from this grass and consequently must be <br /> irrigated carefully. It is imperative that the lawn clippings are captured and hauled off-site and not <br /> allowed to fall back onto the lawn. If lawn clippings fall back onto the lawn,this completes the <br /> nitrogen cycle and contributes additional nitrogen to the system. <br /> III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> Typically, loading projections for commercial facilities are based on the maximum anticipated <br /> wastewater flows generated by people that occur daily, weekly, monthly, or for singular events. <br /> Siegfried has calculated flow volumes from both Buildings A&B-to be a total ADF of 640 gpd, or <br /> 320 gpd per Building. This flow volume will be used below in the nitrate loading calculations. <br /> Wastewater Characteristics <br /> To accurately assess and quantify the anticipated nitrogen concentration emanating from the proposed <br /> sanitary sewer septic system, an effluent sample was obtained from the septic tank installed in 2017 <br /> that serves a number of Buildings in the Holly Commerce Center. This tank is located directly <br /> southeast of the sugar storage silos. <br /> Test results reveal a high ammonium concentration of 137 ppm and a comparatively low organic <br /> concentration of 9 ppm, for a TKN concentration of 146 ppm. <br /> Page -6- <br /> Chesney Consulting <br />