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01 e • O <br /> Design <br /> Design Specifics <br /> Tankage Requirements <br /> Distributed primary tankage (locating tanks next to the flow sources) is the most common method of primary tankage due to the configuration of <br /> most campground facilities.The primary tanks may require the use of a pump if the treatment facility is located at an elevation higher than the <br /> primary tanks.Using a primary tank at the treatment area would likely require either a small STEP collection system or a gravity sewer(which <br /> increases the risk for W). <br /> Campgrounds fall within Application Type 2 in Appendix A;therefore total primary tank recommendations call for a minimum of 3 days' retention <br /> at maximum day design flow.Since a pre-anoxic tank is recommended and will be situated at the treatment site,provide a minimum of 2 days <br /> retention at each distributed site,except for the RV dump station. <br /> Table 2A-3:Sample Tank Sizing Recommendations <br /> Tank Sizing Max.Day Design Flow(gpd) Recommended Minimum Primary Tank Size(Gallons) <br /> RV Dump Stations 250 1,750; use 2,000 <br /> Shower House w/Restrooms 4,500 9,000 <br /> Restrooms 1,800 3,600; use 4000 <br /> Camp Host Living Quarters 150 300; use 1,000 gallon minimum <br /> 8 Per note 5 in Appendix A,Primary tankage for RV dump station should be a minimum of 7 days <br /> Size for the Pre-Anoxic Tank at the Treatment Site:6700 gallons, use 6,000 or 8,000 gallons.Since the system is only required to treat for organ- <br /> ic constituents, it would be configured as shown below(see page 10): <br /> Pre-Anoxic Return Line <br /> Primary Pre-Anoxic AdvanTex Discharge <br /> Treatment <br /> Figure 2A-1.Treatment Configuration for Organic Constituents <br /> Loading Calculations <br /> For all loading calculations,the design maximum day loading rates are double the design loading rates for average day.Since the design maxi- <br /> mum day flow is not greater than two times the average day design flow,the calculation for maximum day design load is unnecessary. <br /> Organic Loading <br /> Since BODS is greater than TSS,calculating for the most restrictive parameter(BODO is necessary. Design Average OLRA is 0.04 lbs <br /> BOD5/ft2•d, <br /> Determine the pounds per day of Average Day Organic Load, OLA using Equation B1 A from Appendix B: <br /> OLA = (300 mg/L)*(8.34 x 10-6 lbs•L/mg•gal)*(3350 gpd) = 8.4 lbs/d <br /> Determine the textile area required based on Average Day Organic Load,AOLRA using Equation 1.1: <br /> (8.4lbs/d) _ f z <br /> A°LRA — 0.04lbs/ftzd — 210 t <br /> NDA-ATX-1 Orenco Systems®•800-348-9843•+1 541-459-4449•www.orenco.com <br /> Rev.8,©10/20 <br /> Page 32 of 38 <br />