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---------------- WASTEWATER FLOW DETERMINATION METHODS AVERAGE DAILY FLOW VOLUMES EHD SEWAGE STANDARDS DATA (gallons per day) 30 gals/Office Employees x 67 employees 2,010 gpd Does Not Account for Aqua Pools'Construction Office Toilet Fixture Counts for a Store=24 toilets x 150 gals/fixture 3,600 gpd Parking Stalls: 166 Stalls x 15 gals/Stall for Industrial Buildings 2,490 gpd Accounts for Employees and Customers of Both Commercial Center and Aqua Pools'Construction Office Historical Data: Comparable Data Does not Exist ------- Average of All Wastewater Flow Determination Methods 2,700 gpd The new wastewater disposal system for the Aqua Pool and Spa facility has been designed for 2,500 gpd since this is based upon the approximate average of all flow determination methods above, and is within the operational capacity of one EnviroServer ES25. Daily wastewater flows for the Aqua Pool facility will be determined by flowmeters to be installed on the pumps that discharge effluent to the disposal field. It will be the determination of EHD on how effluent volume through the meters is to be quantified. This may be by taking a meter reading on a daily basis, or over a specified period of time and dividing by the number of days between readings to arrive at an average gpd. Therefore, the flowmeters must be readily accessible for easy reading. Peaking factors for users on septic tanks vary with usage during the hour of the day, and day of the week. Peak hourly rates are associated with normal working hours. The ratio of the peak day to the average day can vary from 1.5 to>5, depending upon the usage. However, since the ADF cannot exceed 2,500 gpd, peaking factors are not as relevant, and the effluent pump will dose on demand. Filter Bed Area The filter bed area is typically calculated under Section 8.7 of the San Joaquin County Sewage Standards and EHD Document 42-01-004: Calculation Requirements for Commercial Septic Systems: Calculated Tank Capacity (CTC) = 1,125 gals+0.75 x 2,500 =3,000 gals 2,500 gallon EnviroServer+ 1 - 500 gallon lift station(or a 1,200 gallon septic tank=3,000 gals Lineal Feet of Leachline(LFLL) = 1,200 BTC +2,500 ADF x 0.225 SF = 833 LFLL Filter Bed Area= 833 x 3 =2,500 square feet. However,the filter bed area should also correspond with the percolation, and more particularly, the infiltration test results. As referenced above, the application rate correlated with the infiltration test results, is 0.757 gals/ftZ/day. Using the ADF of 2,500 gpd= 0.757 gals/ftZ/day= 3,305 sq ft filter bed. The filter bed is proposed to be 60 ft x 60 ft= 3,600 ft . �L�— Page -8- Chamey age -8- Chesney Carrsulting