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A6. Filter Fabric (con't) When to use filter fabric? Fluid Containment requires the use of filter fabric for the following types of installations: • Tidal conditions. • Areas subjected to frequently changing ground water lev- els. • Unstable soils (muck or landfills, see section A4). • Water conditions with silty soil. For other types of installations, the responsibility for deter- mining if a filter fabric is appropriate for a specific tank installation remains with the tank owner or technical repre- sentative. Installing Filter Fabric - Dry Hole • Line the sides and bottom with filter fabric. • Overlap adjoining fabric panels at least 12". • Place backfill on top of the filter fabric to hold it in place. Installing Filter Fabric - Wet Hole • Backfill ballast is necessary to sink and hold the fabric to the bottom of the hole. Suitable brand name filter fabrics are listed below. Call the phone numbers listed for local distributors. Manufacturer Product Phone Reemay, Inc. TYPAR 3401 (800) 284-2780 TYPAR 3341 (615) 847-7000 Amoco Fabrics Amoco CEF 4545 (800) 374-6606 & Fibers (404) 984-4444 Hoechst Celanese TREVIRA S1120 (800) 845-7597 Corporation (hole depth less than 10� (803) 579-5269 TREVIRA S1125 (hole depth greater than 10' deep) • DO NOT use polyethylene as a filter fabric because it will degrade over time. A7. Anchoring It is the responsibility of the tank owner or the owner's technical representative: • To determine if mechanical anchoring is required for a specific job site. • To consider all potential sources of water, such as: ❑ Underground water table. ❑ Rain water runoff, flooding, etc. (which may fill a slow draining tank excavation). 6 What is the purpose of anchoring? Mechanical anchoring is used to secure the tank in condi- tions where the tank could become buoyant (i.e. water in the hole). There are two common methods of mechanical anchoring: • Concrete anchor pad. • Deadman anchors. Note: Both methods require the use of Fluid Containment fi- berglass anchor straps. When do you need to anchor your tank? If water can enter the hole, Fluid Containment recommends that tanks be mechanically anchored unless the minimum burial depth from tank top to grade meets or exceeds the values in the following chart: Anchoring Chart Minimum burial depth to achieve 1.2 safety factor as- suming worst case conditions of water to grade and the tank empty. Assumes multiple tank installation and 2 deadman width minimum spacing. Anchoring Minimum Burial Depth Method No Top Slab No Top Slab No Turbine 42" Sealable Turbine Enclosure Enclosure 4' Diameter Tanks • 8" Bottom Slab 24" 24" • 6" x 6" Deadmen 24" 26" (24" min. spacing) • No Mechanical Anchoring 24" 36" 6' Diameter Tanks • 8" Bottom Slab 24" 24" • 12" x 12" Deadmen 27" 30" (24" min. spacing) • No Mechanical Anchoring 42" 50" 8' Diameter Tanks • 8" Bottom Slab 32" 36" • 12" x 12" Deadmen 40" 44" (24" min. spacing) • No Mechanical Anchoring 55" 60" 10' Diameter Tanks (IOM to ISM Gallon) • 8" Bottom Slab 40" 42" • 18" x 12" Deadmen 40" 42" (36" min. spacing) • No Mechanical Anchoring 62" 66" 10' Diameter Tanks (Over 15M Gallon) • 8" Bottom Slab 42" 46" • 18" x 12" Deadmen 48" 50" (36" min. spacing) • No Mechanical Anchoring 70" 74" Contact Tank Technical Support for alternate anchoring methods. Phone number is listed on page 2.