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" UG TANK BUOYANCY/RESTRAINT CALCULATIONS Date: 05/24/99 <br /> Proj: PACIFIC BELL FRENCH CAMP <br /> PN: 4747.00 <br /> (1) 2,000 GALLON TANK <br /> DESIGN PARAMETERS: <br /> VGS = (0.67 * 12.00 * 13.00) - (29 * 0.67 /3.00 * 1) = 98 cu.ft. <br /> WGS = 98 * (150.00 - 62.4) / 1,000 = 8.55 kips <br /> Weight of Backfill (WPG) <br /> WPG = VPG * (RPG - 62.4 Ib./cu.ft.) / 1,000 Ib/kip <br /> Volume of Backfill (VPG) <br /> VPG = (A * L) - ((VT/2) + (N * VS) + VGS) <br /> Height of backfill useable as down force (surface to midtank) (h) <br /> h = HC + (D/2) <br /> h = 3.00 + (7.83/ 2) = 6.92 ft. <br /> Horizontal projection of backfill due to slope factor (a) (perp. to tank) <br /> a = h * SRS <br /> a = 6.92 * 0.25 = 1.73 ft. <br /> End area of backfill (A) <br /> A = (D + a) * h <br /> A = (7.83 + 1.73) * 6.92= 66 sq.ft. <br /> VPG = (66 * 6) - ((301/2) +(1 * 29) + 98) = 136 cu.ft. <br /> WPG = (136 * (120 - 62.4) 11,000 = 7.85 kips <br /> HDF = 4 + 9 + 8 = 21 kips <br /> HOLD DOWN FACTOR (HD) - CASE 1 <br /> HD = HDF / BF <br /> HD = HD = (21 / 21 ) = 1.01 <br /> 1.01 <= 1 20 Provide additional anchorage See hold down Case 2 <br /> HOLD DOWN FORCE (HDF): CASE 2 - CONCRETE DEADMAN <br /> Concrete Deadmen Quantity: 2 ea. (CDQ) <br /> Concrete Deadmen Height: 1.00 ft. (CDH) <br /> Concrete Deadmen Length: 6.25 ft. (CDL) <br /> Concrete Deademen Width: (ea) 1.00 ft. (CDW) <br /> HDF = DW/1,000 Ib./kip + WGS + WPG + WDM <br /> WPG = VPG * (RPG - 62.4 Ib./cu.ft.) <br /> VPG = (A * L) - (VT + (N * VS) + VGS) <br /> Height of backfill useable for down load (surface to bottom of tank) (h) <br /> Helmick and Lerner Inc <br />