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5) Burial Depth and Cove Therank hole must be deep enough to allow aum of 12" required backfill bed over the hole bottom or concrete slab. If the total burial depth from tank top is greater than 60% of the tank diameter, anchoring the tank is not required. (See Section 9 for details.) determined ?ii -stability 24" backfill 12" backfill reinforced concrete 12" PAD DIMENSIONS Paving must extend at least 12" beyond tank outline in all directions. MAXIMUM BURIAL DEPTH (ALL SIZE TANKS) To comply with UL requirements, depth of cover for tanks in both traffic and no traffic conditions must not exceed 7' over tank top. For burial depths greater than 71, contact the Fiberglas Tank Installation Manager. No Traffic Loads (550-20,000 gallon models) Tanks not subjected to traffic loads need a minimum cover of 24" backfill; or 12" plus 4" reinforced concrete. MINIMUM BURIAL DEPTH Traffic Loads (550-20,000 gallon models) Tanks subjected to traffic loads must have a cover depth of 36" backfill or 18" minimum backfill Plus 6" of reinforced concrete. The reinforcements in the concrete pad must be properly sized for the job conditions to assure concrete surface pad integrity. No Traffic Loads (25,000-48,000 gallon models) Tanks not subject to traffic loads need a minimum cover of 42" backfill; or 38" backfill plus 4" rein- forced concrete. Traffic Loads (25,000-48,000 gallon models) Tanks subjected to traffic loads must have cover depth of 38" backfill, plus 6" of asphalt, or 6" of re -bar reinforced concrete. ) Filter FabriWWet Hole Liner It is the responsibility of the tank owner or his technical representative to determine if filter fabric is appropriate for a specific tank installation. Our experience indicates that if all the other installation instructions are carefully followed, the use of filter fabric is not essential. Filter fabric prevents the migration of pea gravel with native soil; it helps to maintain the integrity and stability of the backfill material. Owens-Corning recommends the use of filter fabric for the following types of installations: 1. Tidal conditions or areas subjected to frequently changing ground water levels. 2. Unstable soils (muck or landfills) 3. Water conditions with silty soil Suitable brand name filter fabrics are itemized below. Local filter fabric distributors can be identified by calling the phone numbers listed. Manufacturer Reemay, Inc. Product TYPAR 3401 or TYPAR 3341 Phone (800)321-6271 Manufacturer Hoechst Celanese Corporation Product TREVIRA S1120 (hole depth less than 10' deep) TREVIRA S1125 (hole depth greater than 10' deep) Phone (800) 845-7597 Manufacturer Phillips Fibers Product SUPAC4NP Phone (800) 845-5737 Polyethylene is not considered an effective material to prevent migration of pea gravel and native soil; it tears and will degrade in a wet hole environment. Installation Procedure: Line the excavation sides and bottom with filter fabric. Overlap adjoining fabric panels at least 12 inches. Place some backfill on top of the filter fabric in and around the excavation perimeter to hold the fabric in place. In wet hole installations, backfill ballast is necessary to sink and hold the filter fabric to the bottom of the excavation. 7) Installation Procedure—Dry Hole Bed Provide a minimum of 12" level approved backfill bed (see Section 1) over hole bottom or concrete slab. Set tanks on bed. DO NOT PLACE TANKS DIRECTLY ON CONCRETE SLAB, TIMBERS, BEAMS OR CRADLES. DO NOT MIX APPROVED GRAVEL WITH SAND OR NATIVE SOIL. Always use approved gravel. Do not backfill in layers using sand or native soil. Regardless of the hole size, all excavated (or loose) native soil must be replaced with approved backfill material. long handled probe Backfilling (550-48,000 gallon models) Note: TANKS INSTALLED WITH BACKFILL TO TOP OF TANK, BUT WITHOUT BACKFILL TO First 12" lift of GRADE SHOULD BE COM - backfill PLETELY FILLED WITH WATER OR PRODUCT AS BALLAST, DO NOT PLACE WATER OR PRO- voidsDUCT IN TANK UNTIL BACKFILL IS EVEN WITH TANK TOP.