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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)from the filter bed disposal area. III. NITRATE LOADING STUDY FINDINGS The Nitrate Loading Study findings will be discussed in the following sequential categories: 1.) Projected wastewater flow volumes from the Church Restrooms. 2.) Anticipated wastewater characteristics. 3.) Nitrate loading to the soil and groundwater underlying the effluent disposal area. 4.) Septic system design criteria. 5.) The Conclusions and Recommendations Section. A. WASTEWATER FLOW PROJECTIONS AND CHARACTERISTICS WASTEWATER FLOW VOLUME PROJECTIONS A number of variables are involved in estimating wastewater flow from the Ripon Church of Christ and correlating these flow volumes with nitrate loading and design considerations. Flow volume projections for facilities in unsewered areas of San Joaquin County have been historically and typically calculated under one or more of the following guidelines: 1. Data published in the San Joaquin County Sewage Standards. 2. Total number of fixtures serving the Church, leading to calculated use per capita. 3. Anticipated maximum number of on-site Parishioners. 4. Historical wastewater flow data from the Church. 5.Number of parking spaces. 6.Data published in the scientific literature. Of the six flow volume determination guidelines listed above, the first three can be associated with this project. The San Joaquin County Sewage Standards assigns IOrgallons per person for a Church with a kitchen, and 5 gallons per person for a Church without akAtchen. These are - exorbitant flow volume valubs and are based on antiquated plumbing fixtures that possessed high water usage. In addition,the Sewaee Standards assign 150 gallons per toilet fixture/day, which is typically taken to incorporate urinals, sinks, drinking fountains, etc. This is also an extremely high flow volume given contemporary low flow fixtures The second flow volume determination cannot be calculated since the total number of fixtures is unknown. The third flow volume determination is known by the anticipated number of Parishioners each day of the week as illustrated in the attached Application-Use Permit Church Demographics found in Appendix B. This population data will be used to calculate the average weekly flow volumes and for the nitrate loading portions of this project. The disposal system must be designed to accept the maximum daily flow of any day of the week even though other days of the week may have lower or nonexistent flow volumes. 6