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LUCCA WINERY SOIL SUITABILITY & NITRATE LOADING STUDY MAY 2013 III. NITRATE LOADING STUDY FINDINGS A. Wastewater Flow Volume Projections and Characteristics L Wastewater Flow Volume Projections To determine nitrate-nitrogen loading from the project, wastewater flow volumes will be conservatively determined. Typically, loading projections are based on the maximum or total number of employees and customers who may potentially use the toilet/sink, etc. on a workday basis. Several variables are involved in estimating wastewater flows from a facility. Wastewater flow volume projections for facilities in unsewered areas have been historically and typically calculated under numerous guidelines and scenarios, as illustrated in the following list: 1. Published Data in the San Joaquin County EHD Sewage Standards and scientific literature. 2. Number of bathroom fixtures correlated with bathroom use per capita for a facility. 3. Number of parking spaces at a facility. 4. Maximum number of people (e.g., employees, customers, etc.). 5. Historical wastewater flow data from an existing facility. For this analysis, the Phase I and Phase II facilities waste flows are estimated. The Phase I facility consists solely of a single bathroom facility with a single toilet and sink. Since the Phase II project is not planned to be constructed as of yet, but is mentioned in the Use Permit Application, the loading of the facilities wastewater is to be included as part of the Nitrate loading study. The capacity or the number of employees for Phase 11 has not yet been determined, however, current codes were evaluated to aid in the development of the Phase 11 waste loading computation. The occupancy for the Phase 11 facility was identified per the 2010 California Building Code Section 306.3, "Factory _ Industrial F-2 low-hazard Occupancy." The number of fixtures for the Phase II facility was determined per the 2006 International Plumbing Code, Section 403, Table 403.1, number 4. Table 403.1 identifies that the required fixtures is to be 1 per 100 employees per facility. Furthermore, the buildings will occasionally be used for wine tastings. It is anticipated that these tasting events will have approximately 50 people or ss at a time. According to the 2010 California Building Code Section 303.1, exception 2, "A building -. or tenant space used for assembly purposes with an occupant load of less than 50 persons shall be classified as a Group B occupancy." Under the 2006 International Plumbing Code, Section 403, Table 403.1, row 2 for Group B occupancy, there is to be - 1 fixture per 25 people up to the first 50 people. The number of fixtures required for the Phase 11 facility is determined to be a total 2 toilets and 2 sinks and two-lavatories_(one fixture per lavatory). Since it cannot be adequately determined how many people will use the restrooms on a daily basis, an estimate of assigning three flushes per hour, for the toilets, per day is Page 18