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PRECIPITATION AND Eto DATA FOR TRACY, CA <br /> Month 2 Years in 10 will have Eto Average' Potential Deep <br /> more precipitation than: Percolation (in/mo) <br /> (in/mo) (in/mo) (inlday) <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 chart 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 <br /> potentially occur. <br /> III. NITRATE LOADING STUDY RESULTS <br /> A. WASTEWATER FLOW PROJECTIONS AND CHARACTERISTICS <br /> It is assumed there will be no cooking within kitchen/office areas in any of the commercial <br /> complexes, and consequently no need for garbage disposals. Therefore, there should be no highly <br /> concentrated organic loading. The characteristics of the wastewater flow will be predominately <br /> blackwater from toilets, with a comparatively small volume of graywater from sinks, or other <br /> sources of graywater. Additional wastewater constituents may consist of coffee,juices or other <br /> similar type liquids to the system. There should be no industrial or commercial chemicals, <br /> solvents, etc. introduced into any of the septic systems. <br /> 8 <br /> Chesney Consulting <br />