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A. WAS FLOW PROJECTIONS AND CHARACTERISTICS The cha7racteristics of the wastewater flow will be predominately blackwater, and smaller volumes of gray water from sink water. Food preparation will not occur in the Produce Stand and it is my understanding that there will be no pipeline connection between the Produce Stand and the detached Men's and Women's Restrooms. All food and food by-product wastes must be handled as solid wastes and not be disposed of into the septic system. This will prevent concentrated organic loading and prolong the lifespan of the wastewater disposal system. It is also important that no industrial or commercial chemicals, solvents, excessive cleaners, etc. are introduced into the septic system, as well as other items such as sanitary napkins, any paper products other than toilet paper, cloth, plastic, cigarettes, etc. However, it is recognized that this is extremely difficult with public restrooms. WASTEWATER FLOW VOLUME PROJECTIONS A number of variables are involved in estimating wastewater Average Daily Flows (ADF) from a commercial facility. Wastewater flow volume projections for facilities in unsewered areas of San Joaquin County have been historically and typically calculated under one or more the following guidelines: 1. Data published in the San Joaquin County Sewage Standards. 2. Data published in the scientific literature. 3. Number of bathroom fixtures for a facility, leading to calculated bathroom use per capita. 4. Number of parking spaces for a facility. 5. Maximum number of known people on-site(e.g., employees, customers, etc.). 6. Historical wastewater flow data from an existing or comparable facility. However, the San Joaquin County Sewage Standards is very specific about wastewater flows from facilities such as Produce Stands: The Standards assigns 150 gallons per toilet fixture for"Stores" with employee and customer use. It is my understanding that there will be one toilet each for the Men's and Women's restrooms. These two toilets produce an Average Daily Flow (ADF) of 300 gallons per day(gpd). With modern, low-flow toilets at 1.5 gallons per flush means that each toilet would have to be flushed 100 times each day to meet the assigned standard. COMMERCIAL WASTEWATER CHARACTERISTICS Primary wastewater constituents-of-concern found in septic tank effluent have influence over two important factors in the operation of an on-site, decentralized wastewater disposal system: Soil effluent acceptance rates and nitrate-nitrogen impact. The Biochemical Oxygen Demand(BOD) test is the most common test used in wastewater analysis,but can be unreliable for determining organic matter in water. BOD is the amount of oxygen, expressed as mg/L or ppm, that bacteria take from water when they oxidize organic matter. 9 Chesney Consulting