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PRECIPITATION AND Eto DATA FOR TRACY, CA July 0.28 8.68 0.28 - August 1.05 7.75 0.25 - September 0.84 5.70 0.19 - October 1.06 4.03 0.13 -- November 2.10 2.10 0.07 - December 2.38 1.55 0.05 0.83 TOTALS(in.) 13.18 57.0 ------ 2.21 The Table illustrates that evapotranspiration far exceeds precipitation, even when using higher rainfall data that exceeds normal rainfall data by 28% (10.33 in. vs. 13.18 in.). Only in the months of December and January, and possibly November and February would deep percolation potentially occur. This data illustrates a relatively high potential for there to be significant evapotranspiration (or bare soil surface evaporation). III. NITRATE LOADING STUDY FINDINGS A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS Wastewater Flow Volume Projections To determine nitrate-nitrogen loading from this 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, monthly, or for singular events. The number of people on-site for this project at any given time will be quite variable. It is my understanding that no one will live on-site permanently. An average daily flow(ADF) of effluent generally accepted from a four bedroom house is 400 gallons per day(gpd). However, considering there are only three residential units, each with one bathroom, it is reasonable that the ADF can be reduced to 300 gpd. Additionally, exclusively taking the proposed Prayer and Mediation Building into consideration, it is anticipated there will be only two meetings per month on average, consisting of approximately 20 people. Wastewater flows from this structure will be minimal. Therefore, 300 gpd is a realistic flow rate for the entire facility. As will be demonstrated in Conclusions Section, calculations show the soil will accept up to 596 gpd, which is almost twice the anticipated ADF. Wastewater Characteristics Considering wastewater from the entire facility, blackwater will originate from toilets and graywater from dishwashing, showers, laundry and hand washing. The potential for a higher organic loading exists from kitchen use, which only exists in three of the four residential units. However, it is imperative that in order to reduce this potential higher organic loading, all food wastes must be handled as solid wastes and disposed of as such. Additional wastewater constituents may consist of Page -6-