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All Single • Double Wall Tanks - SECTION FIGURE 9 Suitable brand name filter fabrics are listed below. Call the phone numbers listed for local distributors. 36"Backfill t8",Backfill Manufacturer Product Phone 6"'.Rektor d Concrete Reemay, Inc. TYPAR 3401 (800) 284-2780 TYPAR 3341 (615) 847-7000 Amoco Fabrics Amoco CEF 4545 (800) 374-6606 & Fibers (404) 984 4444 ::12"Beddin 12"Beddin Hoechst TREVIRA S1120 (800) 845-7597 ♦ Tanks need a minimum cover depth of 36' backfill Celanese Corp. (hole depth less than 10') (803) 579-5269 R 18" of backfill plus 6" of reinforced concrete (see TR IRA S1125 fl ure 9). (hole depth greater than 10' deep) (12' diameter tanks) DO NOT ♦ Tanks need a minimum cover of 38" backfill plus 6" of reinforced concrete. ♦ Use polyethylene as a filter fabric because it will de- grade over time. A6. FILTER FABRIC ANCHORING Why use filter fabric? It is the responsibility of the tank owner or the owner's ♦ F Iter fabric allows the passage of water but helps pre- vent the migration of gravel backfill into native soil. technical representative: ♦ F Iter fabric helps maintain the integrity and stability of ♦ To determine if mechanical anchoring is required for a bcMill materials. specific job site. Wh n to use filter fabric? ♦ To consider all potential sources of water, such as: Containment Solutions requires the use of filter fabric for ❑ Underground water table. the following types of installations: ❑ Rain water runoff, flooding, etc. (which may fill a ♦ Areas subject to tidal conditions. slow draining tank excavation). ♦ A eas subjected to frequently changing ground water What is the purpose of anchoring? Mechanical anchoring is used to secure the tank in con- levels. ditions where the tank could become buoyant (e.g.water ♦ Unstable soils (muck or landfills, see section A4). in the hole). ♦ Water conditions with silty soil. There are two common methods of mechanical anchoring: For other types of installations,the responsibility for de- • Concrete anchor pad. ♦ Deadman anchors. termining if a filter fabric is appropriate for a specific tank Note: Both methods require the use of Containment Solu- instIlation remains with the tank owner or technical rep- tions fiberglass anchor straps. res e tative. When do you need to anchor your tank? If water can enter the hole, Containment Solutions rec- FILTER FABRIC INSTALLATION — DRY HOLE ommends that tanks be mechanically anchored unless • Line the sides and bottom with filter fabric. the minimum burial depth from tank top to grade meets or exceeds the values in the following chart. • Overlap adjoining fabric panels at least 12". • Place backfill on top of the filter fabric to hold it in place. FILTER FABRIC INSTALLATION – WET HOLE • Backfill ballast is necessary to sink and hold the filter fabric in place in the bottom of the hole. CONTINUED ON PAGE 10 9