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WA'LTON ENGINEERING, INC. TRACY TEXACO - TRACY, CA 12/30/97 16:22 TANK HOLDDOWN/BUOYANCY CALCULATION - 20,000 GAL. <TRACY-2.WK1> THIS CALCULATION IS FOR TRUSCO TANKS, AS DESCRIBED BELOW: CAPACITY 20000 GALLONS WEIGHT 18397 LBS. DIAMETER 10.78 FEET SUMPS 2 LENGTH 30.05 FEET TANK SLAB THICKNESS 1.00 FT. BURY DEPTH (TOP OF SLAB) 5,00 FT. ASSUME TANK AND BACKFILL COMPLETELY SUBMERGED, TO BOTTOM OF SLAB: SUBMERGED WGT OF BACKFILL = 60.00 LBS/C.F. (PCF) UNSUBMERGED WGT OF CONCRETE 150.00 PCF WATER : 7.48 GALS./C.F. WATER : 62.40 PCF 1. OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING FORMULA (PER PEI/RP 100-94): ((H/3)(B1 + B2 + SgRt B1*B2)) - ((V/2) + M) D : TANK DIAMETER d = BURIAL DEPTH (to BOTTOM of SLAB) = 4.00 FT. R = (D/2) + d = 9.39 FT. L = TANK LENGTH B1 = SLAB AREA = (L+4)*(D+3) = 469.25 SQ.FT. B2 : REFLECTED TANK AREA (D#L) = 323.98 SQ.FT. V = TANK DISPLACEMENT : Pi$rr*L = 2743.30 C.F. M = VOIDS IN OVERBURDEN : 42" DIAN. SUMPS t 2 SUMP : Pi#(3.5'/2)(3,5'/2) $ 4.00 FT. x : 76.97 C.F. THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: H/3 B1+B2 SgRtBl*B2 (V/2)+M 3.13 793.23 389.91 1448.62 - 2254.84 C.F. 2254.84 C.F. i 60.00 PCF = 135290 LBS. 2. CONCRETE SLAB : B1 * SLAB THICKNESS * CONC. WGT.: 70388 LBS. 3. TANK WEIGHT (PER MANUFACTURER) = 18397 LBS. 4. TANK TOP ANCILLARY EQUIPMENT : 1500 LBS. TOTAL UPLIFT FORCE (UF) _ (V+M) * WATER.WGT.= 175985 LBS. TOTAL RESISTANT FORCE (RF) _ (ITEMS 1.-4.) = 225575 LBS, EXCESS RESIST FORCE RF -UF = 49591 LBS.: 24.8 TONS RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 60 " MIN. BURY DEPTH. SAFETY FACTORY = RF/UF : 1,28 (DOES NOT INCLUDE FRICTION FACTORS, WHICH INCREASE MARGIN). -00o- 01*47o*- 843 Riske Lane, West Sacramento, CA 95691 (916) 372-1888 - Fax 373-1172 Mailing Address: R0. Box 1025, West Sacramento, CA 95691