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f TABLE 4 f PRECIPITATION AND Eto DATA FOR STOCKTON, CA:, Month 2 Years in 10 will have more Eto Average Potential Deep precipitation than: (in/mo) Percolation (in/mo) (in/mo) (in/day) January 4.42 1.24 0.04 3.18 February 3.20 1.96 0.07 1.24 March 3.43 3.41 0.11 -- April 1.92 5.10 0.17 May 0.50 6.82 0:22 -- June 0.25 7.80 } 0.26 -- July 0.23 8.06 0.26 -- August 0.40 7.13 0.23 -- September 0.76 5.40 r 0.18 -- October 1.39 3.72 l 0.12 -- November 3.31 1.80 0.06 1.51 December 3.67 0.93 0.03 2.74 k TOTALS (in.) 18.92 53.4 ------ 8.67 This chart illustrates that evapotranspiration far exceeds precipitation, even when using higher rainfall data that exceeds normal rainfall data by 56%. Only in the months of January, February,November and December would deep percolation potentially occur. This data illustrates a relatively high potential for 3 v� there to be significant evapotranspiration (or bare soil surface evaporation) from a wastewater disposal system design that may take advantage of evapotranspiration during favorable months of the year. III. NITRATE LOADING STUDY FINDINGS A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS j Wastewater Flow Volume Projections I To determine nitrate-nitrogen loading from any project,wastewater flow volumes must be determined as accurately as possible. Typically, loading projections are based on the maximum anticipated wastewater flows, occurring daily, weekly,or for singular events. The number of Parishioners for the St. Sharbel Church was initially defined on the Application for a Use Pei 225 for,both Sunday and Saturday Services. rm However,this number has been subsequently revised 125rishioners either on a Saturday Service or a Sunday Service,as illustrated on the Staff Report- Us it found it n Appendix A. 7 Chesney Consulting