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Wastewater Volume Flow Projections 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 Sewage Standards and scientific literature. 2. Number of bathroom fixtures (bathroom use per capita) for a facility. 3. Number of parking spaces for a facility. 4. Maximum number of people (e.g., employees, customers, etc.) for a facility. 5. Historical wastewater flow data from an existing facility. I. The San Joaquin County Sewage Standards assigns 15 gallons per person for Industrial Buildings with no food cafeteria. It is estimated that 23 people will - 2. The number of bathroom fixtures (toilets)is proposed to be seven for the entire,built-out complex. The Sewage Standards assign 150 gallons per toilet fixture (employee/public use). There will be seven toilets total. 3. Parking spaces would not be applicable for this type of project since it is assumed that each vehicle would have an indeterminable number of people per vehicle. Based on the above criteria, and taking into consideration that the number of employees/customers for all of the on-site businesses is.unknown and indeterminable, a wastewater flow volume composed of an average between the number of toilet fixtures and the estimated number of people on-site will be used for calculation and design parameter purposes: 7 toilets after complete build-out x 150 gallons/toilet/day= 1050 gallons per day. Borges Diesel Electric: 1 Employee, 2 Customers Oliveri Cabinet Shop: 5 Full-Time Employees, 2 Part-Time, 0 Customers Accurate Delivery Systems: 3 Full-Time Employees,4 Delivery People, 0 Customers Unknown Future Tenants (Projected): 3 Full Time, 3 Customers 39S TOTAL: 23 people x 15 gal/day= 345 gallons/day 1050 gallons/day k 345 gallons/day= 1395 2 = 700 gallons/day 3 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 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. To determine BOD, oxygen the bacteria uses is calculated by comparing the amount left at the end of 5 days with the known amount at the beginning. Adsorption and volatilization, followed by microbial degradation are the primary processes for removal of soluble organics. 9 Chesney Consulting