INSTALL_1990 - Laserfiche WebLink

Home Browse Search

A5. Burial Depth and Cover A6. Filter Fabrtr Wet Hole Liner The tank hole must be deep enough to allow a minimum of 12'required It is the responsibility of the tank owner or his technical representativeto backfill bed over the hole bottom or concrete slab. determine if filter fabric is appropriate for a specific tank installation.Our experience indicates that if all the other installation instructions are If the total burial depth from tank top is greater than 60%of the tank carefully followed,the use of filter fabric is not essential. diameter,anchoring the tank is not required.(See Section A9 for details.) fff'''..�� Filterfabric preveMsthe migration of pea gravel with native sill;it helpsto PAD DIMENSIONS maintain the integrity and stability of the backfill material.O/C Tanks �► i .--F-12^ am Paving must extend at least 12" recommends the use of filter fabric for the following types of installations: , . - ._. .f - -: beyond tank outline in all 1.Tidal conditions or areas subjected to frequently changing ground - Y : ` directions. water levels. 7 max ! - - : .. ._ MAXIMUM BURIAL DEPTH(ALL 2.Unstable Bolls(muck or landfills) SIZE TANKS) 3.Water conditions with silty soil ... To comply with Ulrequirements, Suitable brand name filter fabrics are itemized below.Local fitter fabric depth of cover fortanks in both distributors can be identified by calling the phone numbers listed. 'r traffic and no traffic conditions must not exceed 7'over tank top. Manufacturer Reemay,Inc. - For double-wall tanks,ifacen- Product TYPAR3401 orTYPAR3341 ......- ?.... .. ......... : tinuous vacuum monitor is used, Phone (800)321-6271 the maximum burial depth is 3 feet Manufacturer Hoechst Celanese Corporation from the tank top to grade. Product TREVIRA S1120(hole depth less than l0'deep) For deeper burial de ths,contact the Fiber las Tank Installation T 00)845EVIRA 7597 (hole depth greater than l0'deep) P 9 Phone (800)845-7597 Manager. Manufacturer Phillips Fibers slope determined by No Traffic Loads Product SUPAC4NP :pe determstabine (550-20,000 gallon models) Phone (800)845-5737 ty Tanks not subjected totraffic loads Polyethylene is not considered an effective material to prevent migration need a minimum cover of 24" of pea gravel and native soil;4 tears and will degrade in a wet hole backfill;or l2"plus 4"reinforced environment. ztias ' 24" backfill concrete.Consult local codes for Installation Procedure:Line the excavation sides and bottom with fitter minimum allowable burial dept h. fabric.Overlap adjoining fabric panels at least 12inches.Placesome 12•backfill backfill on top of the filter fabric in and around the excavation perimeter to 4•reinforced hold the fabric in place. concrete In wet hole installations,backfill ballast is necessary to sink and hold the i filter fabric to the bottom of the excavation. A7. Installation Procedure—Dry Hole .� MINIMUM BURIAL DEPTH Bed Traffic Loads Provide a minimum of l2"levels roved backfill bed see Section A2 (550-20,000 gallon models) PP ( ) � - - Tanks subjected to traffic loads over hole bottom or concrete slab.Set tanks on bed. must have a cover depth of 36" DO NOT PLACE TANKS DIRECTLY ON CONCRETE SLAB.TIMBERS, BEAMS OR CRADLES. a5^Dk. backfill or 18'minimum backfill plus 6"of reinforced concrete. DO NOT MIX APPROVED GRAVEL WITH SAND OR NATIVE SOIL. la•bid. The reinforcements in the concrete Always use approved gravel.Do not backfill in layers using sand or native .s•rom. pad must be properly sized for the sill.Regardless of the hole size,all excavated(or loose)native soil ronceta job conditions to assure concrete must be replaced with approved bacMill material. surface pad integrity. Backfilling --`� longe oled (550.48,000 gallon models) Note:TANKS INSTALLED WITH No Traffic Loads BACKFILL TO TOP OF TANK, (25,00048,000 gallon models) BUT WITHOUT BACKFILL TO Tanks not subject to traffic loads First GRADESHOULDBECOM- need aminimum cover of42" 12•lift of PLETELY FILLEDWITHWATER backfill;or 38"backfill plus 4"rein- backfill i OR PRODUCT AS BALLAST.DO 12 forced concrete. NOT PLACE WATER OR PRO- DUCT IN TANK UNTIL BACKFILL ISEVENWITHTANK TO P. voids A +4 /2 bed ft's Mtical that this area offer full support undertankand end caps. Traffic Loads (25,00048,000 gallon models) ... ... Tanks subjected to traffic loads must have cover depth of 38" backfill,plus 6"of asphaft,or 6"of Fist ag pM re-bar reinforced concrete. 12^lin or +6" backfill asphait a \. wnorate 'r Ifs critical that this area offer fu 11 support under tank and end caps. 4