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Summer: Volume= 30,000 gal/d(6.1 days)(1 ft3/7.48 gal) =24,465 ft3 Surface area= (24,465 ft'/6 ft)(1 ac/43,560 ft1) = 0.10 acres Therefore, winter condition requirement of 0.22 acres control surface area design. SE. Surface loading: lb BODS/acreed = (0.03 34 b 1/Mgal((mg/ 1)550 �1) 50.25 50 lbs BOD5/acreeday Therefore, increase pond surface area to 0.5 acres to reduce BOD5/acreoday to 275 lbs. E. FACULTATIVE TREATMENT POND STORAGE VOLUME Volume (ft') _ (LWxLLxLD)-[(SxLD1)(LW+LL))+(4xS1xLD'+3) ft' = (150 ftx150ftx6ft) - [(2x61)x (150ft+ 150ft) + (4x21 x63= 3) = ft3 = 135,000 - 21,600 + 1152 = 114,552 ft3 Gals = 114,552 ft'x 7.48 gal/ft' = 856,850 gallons rainfall = (22,500 ft2)(9.6 in total rainfall)(7.48 gal1ft') - 12 in/ft) = 134,600 gals evaporation= (0.05 in/day)(120 days)(22,500 ft1)(7.48 gallft') - 12 in/ft= 84,150 gals Net Gain= 50,450 gals _4 months =+12,600 gal/month during winter months. Entire Facility is in Zone B - 500 year Flood Plain per FEMA Maps. F. POND CONSTRUCTION DETAILS AND DESIGN 1. Embankments: Use of on-site material to construct embankments by excavating four feet of material to build up four feet of compacted embankment. Top width is to be ten feet for vehicle traffic. Inner slope to be 2:1, outer slope to be 3:1. Vegetation should be planted rably low growing grass to prevent erosion. on the outer embankments, prefe 2. Pond: Utilize 30 mil HDPE plastic to line entire surface area of inner side embankments and bottom. One foot overlap at each seam and glued. Four-inch overlength at bottom of embankment to account for soil compaction. Anchored at top of embankment as detailed in Appendix. No less than one foot minimum freeboard. Total depth of pond to be eight feet. Fencing, with warning signs shall be placed around the entire pond. 3. Piping: Influent and effluent lines to be generally accepted sewer line construction material. There should be two to three inspection ports on influent line leaving abattoir to the pond to check for fat, oil and grease (FOG) build-up. Build-up of FOG will require additional treatment of wastewater before entering pond. Influent lines should be place along the bottom, near the north end of the pond. A fresh water line must also be installed to maintain -45- NaOf y gy R4search