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Thornton On-site Waste Water Feasibility Study Page 4 of 9 Our Project Number: 2017-00010 December 1, 2017 Table 2. Typical Quantity of Effluent Total Average Days of Average Daily Flow Category Vehicles Quantity per Use per per Facility per Day Vehicle al Year Shell Service Station 4nn R 365 (400 vehicles x 8-gal x 365 days) / Vehicles 365 days = -3,266 ai CFN Service Station (150 vehicles x 8-gal x 365 days) / Vehicles 150 8 365 365 days = 1,200 gal �� Average Total Days of Quantity per Average Daily Flow Category Employees Employees Use perer per Facility per Day (gal) Year Shell Service Station/Mini- (21 people x 9-gal x 365 days) / mart/Restaurant 21 9 365 365 days = 189 gal Employees Total Average Days of Average Daily Flow Category People per Quantity per Use per per Facility Day Person al Year Fast Food Customers 500 3 365 (400 people x 3-gal x 365 days) / 365 days = ,1,500 al 7, ;,0 SERVICE STATION VEHICLES SHELL &CFN 4,400 gallons SERVICE STATION EMPLOYEES 189 gallons FAST FOOD i 500 allons TOTAL AVERAGE GALLONS PER DAY 6,089 gallons Flow Rate Source: U.S. Environmental Protection Agency. 2002. Design Manua/: Onsite Wastewater Treatment Systems Manual. For the site, the total daily use contributing wastewater quantity is 6,089 gallons per day. According to the EPA Design Manual, the source data (Crites and Tchobanoglous, 1998) for flow rate ranges incorporate the effect of low flow fixtures complying with the U.S. EPA Act of 1994 standard of 2.2 gallons per minute (gpm) when measured at a water pressure of 60 pounds per square in (psi). California's CalGreen (Part 11 of Title 24) Standards require a 20 percent reduction below the current federal guidelines, therefore, the lowest estimates within the typical range provided in the EPA Design Manua/were utilized. Vic f Mrala*_ii-:Ena-neeri^a.inc 2667$GrWC11.;v Red;Go It.Cu 95532 (2C�1-A03-S?29 rk'W'+,WC`Lri'U�71x,::Urn