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TABLE 3 <br /> PRECIPITATION AND Eto DATA FOR STOCKTON, 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 4.42 1.24 0.04 3.18 <br /> February 3.20 1.96 0.07 1.24 <br /> March 3.43 3.41 0.11 <br /> April 1.92 5.10 0.17 <br /> May 0.50 6.82 0.22 <br /> June 0.25 7.80 0.26 6.2d <br /> July 0.23 8.06 0.26 <br /> August 0.40 7.13 0.23 <br /> September 0.76 5.40 0.18 <br /> October 1.39 3.72 0.12 <br /> November 3.31 1.80 0.06 151 <br /> December 3.67 0.93 0.03 2.74 <br /> TOTALS(in.) 18.92 53.4 ------ 8.67 <br /> This chart illustrates that evapotranspiration far exceeds precipitation, even when using higher rainfall <br /> data that exceeds normal rainfall data by 56%. Only in the months of January, February,November <br /> and December would deep percolation potentially occur. This data illustrates a relatively high <br /> potential for there to be significant evapotranspiration(or bare soil surface evaporation) from a <br /> wastewater disposal system design that may take advantage of evapotranspiration during favorable <br /> times of the year. <br /> NITRATE LOADING STUDY FINDINGS <br /> WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> To determine nitrate-nitrogen loading from'any project, wastewater flow volumes must be determined <br /> as accurately as possible. Domestic flow volume projections have been approximated from the <br /> USEPA Onsite Wastewater Treatment Systems Manual, Pg. 3-4. Residential (domestic)flow volumes <br /> average approximately 69 gallons/person/day. Since the exact number of on-site people may vary, <br /> projections will be based on the number of bedrooms each structure has, and will have. The existing <br /> house has three bedrooms and the new structure will have one bedroom, for a total of four bedrooms. <br /> Therefore,total flow volume projection=4 x 69 =276 gallons wastewater/day. <br /> Page 3 of 7 <br /> Chesney Consulting <br />