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WALTON ENGINEERING, INC. QUIK STOP 39 - 2285 E. Fremont, Stockton, CA 95205 08/26/98 10:51 TANK HOLDDOWN/BUOYANCY CALCULATION - 12,000 GAL. <XERX-Q39.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./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 111*112)) - ((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 B1 = SLAB AREA : (L+4)*(D+3) = 451.44 SQ.FT, B2 : REFLECTED TANK AREA (Dr(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. $ 60.00 PCF = 103182 LBS. 2. CONCRETE SLAB : Bl * 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 L-4.) : 154226 LBS. EXCESS RESIST FORCE RF -UF : 41184 LBS.: 20.6 TONS RF MORE THAN UF, THEREFORE, ROLDDOWNS 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