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F NITRATE LOADING STUDY FINDINGS ASTEWATER FLOW PROJECTIONS AND CHARACTERISTICS It is assumed the characteristics of the wastewater flow will be predominately blackwater from toilets, with a comparatively small volume of gray water from sinks, or other sources of gray water. It is also assumed there will be no cooking within kitchen/office areas in any of the commercial offices, and consequently no need for garbage disposals, and that there will be no food processing tenants. Therefore, there should be no concentrated organic loading, especially from fats, oils and grease. Additional wastewater constituents may consist of coffee,juices or other similar type liquids to the system. It is imperative that no industrial or commercial chemicals, solvents, excessive cleaners, etc. are introduced into the septic system, as well as other solid items such as sanitary napkins, any paper products other than toilet paper, cloth, plastic, cigarettes, etc. WASTEWATER FLOW VOLUME PROJECTIONS A number of variables are involved in estimating wastewater flows from a commercial facility. Wastewater flow volume projections for facilities in unsewered areas of San Joaquin County have been historically and typically calculated under many guidelines and scenarios, as illustrated in the following lists: 1. Published Data in the San Joaquin County Sewage Standards and scientific literature. 2. Number of bathroom fixtures for a facility, leading to calculated bathroom use per capita. 3. Number of parking spaces for a facility. 4. Maximum number of people on-site(e.g.,employees, customers, etc.). 5. Historical wastewater flow data from an existing or comparable facility. The following list of flow projection determinations discuss the rationale for arriving at effluent flow volumes for the Ice House project: 1. The San Joaquin County Sewage Standards assigns 15 gallons per person for Industrial Buildings with no food cafeteria. At this time however, it is unknown how many people will be on-site after full occupancy, and during different times of the day and different days of the week. 2. The number of bathroom fixtures(toilets) is proposed to be 22 for the entire,built-out complex. The Sewage Standards assign 150 gallons per toilet fixture (employee/public use). 3. Another method to calculate flow is to assign the maximum number of flushes of all on-site toilets that could occur over an eight-hour day. It can be reasonably concluded that a near-maximum of 6 flushes per hour(1 flush/10 min)could occur daily. 4. The total number of parking spaces for the Ice House facility will be 96,which gives a high estimate for the number of employees,customers,etc. who may be on-site at any given time of the day. These criteria referenced above will be used to formulate an "average daily flow"(ADF) from the completely built-out and occupied Ice House project since the number of employees/customers for all of the on-site businesses is unknown and indeterminable at this time. 11 Chesney Consulting