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'LTABLE, <br /> PRECIPITATION AND Eto DATA FOR TRACY, CA <br /> Month 2 Years in 10 will have more Eto Average Potential Deep <br /> precipitation than: (in/mo) Percolation(in/mo) <br /> (in/mo) (in/day) <br /> January 2.93 1.55 0.05 1.38 <br /> February 2.21 2.24 0.08 <br /> March 2.38 3.72 0.12 <br /> April 1.51 5.10 0.17 <br /> May 0.71 6.82 0.22 <br /> I <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.) 13.18 57.0 ------ 2.21 <br /> The Table illustrates that evapotranspiration far exceeds precipitation, even when using higher rainfall data <br /> that exceeds normal rainfall data by 28%(10.33 in.vs. 13.18 in.). Only in the months of December and <br /> January,and possibly November and February would deep percolation potentially occur. This data <br /> illustrates a relatively high potential for there to be significant evapotranspiration(or bare soil surface <br /> evaporation). <br /> III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> Determination of nitrate loading from the Restroom retrofit of Building G would be extremely <br /> difficult because of the difficulty in determining the proper area to use as a parameter in the nitrate <br /> loading calculations. Therefore,the loading calculations will be based on the total area of the Holly <br /> Commerce Center Parcel (164.28 acres), and taking into account all on-site Restrooms. <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. The <br /> number of people on-site for this facility at any given time is quite variable and basically unknown. <br /> Page -5- <br /> Chesney Consulting <br />