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1Grencollo Determine the pounds per day of Average Day Organic Load, OLA using Equation 131 from Appendix B: OLA2 = (28 mg/L) *(8.34 x 10-6 lbs•L/mg•gal) * (10,500 gpd) = 2.45 lbs/d Determine the textile area required based on Average Day Organic Load,AoLRA using Equation 1.1: (2.45 lbs/d) z AOLRA = 0.02 lbs/ft2d — 123 ft Hydraulic Loading—Second Stage Design average HLRA is 75 gpd/ft' (from page 15). Use Equation 1.2 to determine the textile area required based on Average Day Hydraulic Load,AHLRA: (10,500 gal/d) f z AHLRA — 75 gal/ft2d = 140 t Total Nitrogen Loading—Second Stage Design average TNLRA is 0.007 lbs TN/ft'.Use Equation B6 from Appendix B to determine the value of First-Stage AdvanTex effluent TKNe: TKNe = 160 mg/L x(1 — 0.95) = 8 mg/L Determine the pounds per day of Average Day TKN Load,TKNe, using Equation 131 from Appendix B TKNe = (8 mg/L) * (8.34 x 10-6 lbs•L/mg•gal)*(10,500 gpd) = 0.70 lbs/d Determine the textile area required based on Average Day Nitrogen Load,ArNLRA using Equation 1.3: (0.70 lbs/d) f z AT"LRA = 0.007lbs/ftzd = 100 t The area associated with the Design Maximum Day Hydraulic Loading Rate is the most restrictive and therefore the second stage AdvanTex area should be a minimum of 140 ft'. Treatment Unit Options—Second Stage Option 1: Using AX-Max units —140 ft'area AX-MAX150-28 (Max unit includes recirc-blend tankage and discharge tankage) Option 2: Using AX pod units —140 ft'area (2)AX100, 2625-gallon recirc tank, 2100-gallon discharge tank(Recirculation-blend tank sized at minimum of 25%of OM per page 17 of the Design Criteria; Discharge tank size based on local regulation, but typically sized at minimum of 20% of OM) Other Design Notes • Ensure access to treatment site for maintenance activities. • Ensure availability of water at treatment site for maintenance activities. Orenco Systems®•800-348-9843•+1541-459-4449•www.orenco.com NDA-ATX-1 Rev.8,©10/20 Page 37 of 38