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III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER FLOW PROJECTIONS AND CHARACTERISTICS <br /> The characteristics of the wastewater flow will bean indeterminable mixture of blackwater and <br /> gray water volumes. Food preparation is proposed which will probably increase organic loading <br /> and consequently nitrate loading. All food and food by-product wastes must be handled as solid <br /> wastes and not be disposed of into the septic system. This will prevent concentrated organic <br /> loading and prolong the lifespan of the future wastewater disposal system. <br /> It is also important that no industrial or commercial chemicals, solvents, excessive cleaners, etc. <br /> are introduced into the septic system, as well as other items such as any paper products other than <br /> toilet paper, cloth, plastic, cigarettes, etc. However, it is recognized that this is extremely difficult <br /> with public restrooms. <br /> A number of variables are involved in estimating wastewater Average Daily Flows (ADF) from a <br /> commercial facility. Wastewater flow volume projections for facilities in unsevered areas of San <br /> Joaquin County have been historically and typically calculated under one or more the following <br /> guidelines: <br /> 1. Data published in the San Joaquin County Sewage Standards. <br /> 2. Data published in the scientific literature. <br /> 3. Number of bathroom fixtures for a facility, leading to calculated bathroom use per capita. <br /> 4. Number of parking spaces for a facility. <br /> 5. Maximum number of known people on-site (e.g., employees, customers, etc.). <br /> 6. Historical wastewater flow data from an existing or comparable facility. <br /> The San Joaquin County Sewa e Standards is specific about wastewater flows from facilities such <br /> as Stores/Markets. The Standards assign 150 gallons per toilet fixture for"Stores"with employee <br /> and customer use. It is niy understanding there is one toilet for the unisex public restroom, and <br /> one unisex toilet for employee use inside the store. These two toilets produce an Average Daily <br /> Flow (ADF) of 300 gallons per day(gpd). With modern, low-flow toilets at 1.5 gallons pet flush <br /> means that each toilet would have to be flushed 100 times each day to meet the assigned standard. <br /> B. CALCULATED NITRATE-NITROGEN LOADING <br /> NLS§3.yhe calculated or estimated nitrate-nitrogen impact to the soil and ultimately to the groundwater <br /> is difficult to determine due to the number of variables involved. These variables include 1.) Variability in <br /> wastewater flows,nitrogen concentrations and dilution effects that may occur, 2.) Impact from previous on- <br /> site operations, 3.)Upgtadient nitrate sources from agricultural farmland, 4.) Changes in groundwater <br /> directional flow and elevation, 5.)Denitrification potential within the soil environment and within the <br /> confined and unconfined aquifers 6.)Potential landscape uptake of nitrogen, and 7.)Rainfall recharge. <br /> 8 <br /> Chesney Consulting <br />