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TABLE 4 <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 /> 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 <br /> rainfall data that exceeds normal rainfall data by 28% (10.33 in. vs. 13.18 in.). Only in the months <br /> of 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 /> Page -6- <br /> Chesney Consulting <br />