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r� , <br /> 01/09/2003 Page 4 <br /> '� <br /> TIME DOSING WORKSHEET/SCREENED PUMP VAULT <br /> ;; 1000 gallon septic tank. <br /> - 1. Determine Surface Area <br /> Rectangle area = L x W = 7.50 x 5.00 = 37.5 sq.ft' <br /> ,� <br /> � 2. Calculate Gallons Per Inch <br /> Area x 7.5 / 12 = 37.5 x 7.5 / 12 = 23.4 gallons/inch <br /> � 3. Calculate Total Volume of Tank Inside Bottom of Tank to Inlet Invert <br /> � ) <br /> � 45 inches x 23.4 = 1055 all ns <br /> 4. Calculate Total Unusable Tank Capacity <br /> ,� A. Inside Bottom of Tank to Redundant Off Float _ 25 inc es <br /> B. Convert to Gallons, 25 inches x 23.4 5� II ns <br /> -,d 5. Calculate Total Usable Tank Capacity <br /> ' A. Distance between Timer On and Inlet Invert = 20 inches <br /> B. Convert to gallons, 468•8 Ilon <br /> � <br /> :�1 6. Calculate Gallons Per pose <br /> A. System Design Flow= 750 gallons per day <br /> � B. Loading Factor = # of Orifices x 0.25 gallons per orifice = 26 gallons <br />�d C. Calculate Total Pipe Volume <br /> 1. Determine pipe length of discharge pipe = 125 feet <br /> � 2. Determine total pipe length of laterals and manifold = 252 feet <br /> - 3. Determine liquid volume of pipe = 17.43 gallons per 100 ft <br /> 4. Calculate total volume of discharge pipe and laterals = 66 gallons <br /> � D. Calculate total dose volume; ; <br /> � (gpd/loading factor + total pipe volume) 92 gallons per dose <br /> E. Determine dose volume in inches = 4 Inches <br /> x� 7. S���` Floats <br /> A. Top of tank to Redundant Off Float = 37 inches <br /> � B. Top of tank to Timer On Float = 35 inches <br /> " C. Top of tank to Timer Override/High Level Alarm = 21 inches <br /> '� 8. Surge Capacity (distance between Timer On & Timer Override) = 328.1 alg lons <br /> � 9. Set Timers <br /> A. Number of Minutes On = 1_7 min <br /> B. Number of Minutes Off= 5�. min e <br /> � <br /> � <br />� <br /> � <br />� <br />