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WALTON ENGINEERING, INC. QUIK STOP 76 - 1030 S. Olive Road, Stockton, CA 95205 07/29/98 13:13 TANK HOLDDOWN/BUOYANCY CALCULATION - 12,000 GAL. <XERX-Q76.WK1> THIS CALCULATION IS FOR XERXES TANKS, AS DESCRIBED BELOW: CAPACITY 11527 GALLONS WEIGHT 4650 LBS. DIAMETER 8.00 FEET SUMPS 2 LENGTH 37,04 FEET TANK SLAB THICKNESS 0.67 FT. BURY DEPTH (TOP OF SLAB) 4.00 FT, ASSUME TANK AND BACKFILL COMPLETELY SUBMERGED, TO BOTTOM OF SLAB: SUBMERGED WGT OF BACKFILL = 60,00 LBS/C.F, (PCF) UNSUBMERGED WGT OF CONC, = 150.00 PCF WATER = 7,48 GALS./CJ . WATER = 62.40 PCF 1, OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING FORMULA (PER PEI/RP 100-94): ((H/3)(Bl + B2 + SgRt Bl*B2)) - ((V/2) + M) D = TANK DIAMETER d = BURIAL DEPTH (to BOTTOM of SLAB) = 3.33 FT, H = (D/2) + d = 7,33 FT. L = TANK LENGTH Bl = SLAB AREA = (L+4)#(D+3) = 451,44 SQ.FT. B2 = REFLECTED TANK AREA (D#(L-D)+(D/2*D/2*Pi) = 282.59 SQ.FT. V = TANK DSPLMNT, = Pi((rr*L-2r)+(4/3*rrr)) = 1727,79 C.F. M = VOIDS IN OVERBURDEN : 48" DIAM. SUMPS * 2 SUMP Pi#(4.0'/2)(4.0'/2) # 3.33 FT. * # = 83.78 C.F. THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: H/3 B1+B2 SgRtBI#B2 (V/2)+M 2.44 734.03 357.17 947.67 : 1719.69 C.F. 1719.69 C.F. t 60.00 PCF = 103182 LBS. 2. CONCRETE SLAB = Bl x SLAB THICKNESS x CONC. WGT. = 45144 LBS. 3, TANK WEIGHT (PER MANUFACTURER) : 4650 LBS. 4. TANK TOP ANCILLARY EQUIPMENT = 1250 LBS. TOTAL UPLIFT FORCE (UF) : (V+M) * WATER.WGT.= 113042 LBS. TOTAL RESISTANT FORCE (RF) = (ITEMS 1,-4.) = 154226 LBS. EXCESS RESIST FORCE RF -UF : 41184 LBS. = 20.6 TONS RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 48 " MIN, BURY DEPTH, SAFETY FACTORY = RF/UF = 1.36 (DOES NOT INCLUDE FRICTION FACTORS, NOR REDUCTION FOR WET INTERSTITIAL SPACE, WHICH INCREASE MARGIN). -o0o- 843 Riske Lane, West Sacramento, CA 95691 (916) 372-1888 • Fax 373-1172 Mailing Address: P.O. Box 1025, West Sacramento, CA 95691