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PEA GRAVEL CRUSHED STONE Approved Gravel Approved Crushed Stone Must consist of clean, or Crushed Gravel naturally -rounded aggregate Must be washed with angular with a mix of particle sizes particle size not less not less than 118" or more than 118" or more than 112". than 3/4". No more than 5% may No more than 5% pass the #8 sieve, may pass the #8 sieve. Dry gravel density must Dry gravel density must be a minimum of 95 pounds be a minimum of 95 pounds per cubic foot. per cubic foot. Note: If material which meets these specifications is not available, contact the Containment Solutions Tank Technical Support department for information on approved alternate materials and installation instruc- tions. Using other than approved bedding and backfill materials without Containment Solutions's prior writ- ten approval will void the tank warranty and may result in tank failure. DO NOT ♦ Mix approved backfill with sand or native soil. ♦ Backfill tank with sand or native soil. CAUTION Using unapproved backfill material may result in tank failure and environmental contamination. A3. PRE -INSTALLATION TESTING Do not pressurize tanks over 5 psi (3 PSI FOR 12' DIAMETER TANKS). Tank damage or physical injury can result. ♦ Make sure you understand these instructions. If in doubt, call Tank Technical Support. VISUAL AIR/SOAP TEST - TO BE PERFORMED ON ALL TANKS PRIOR TO INSTALLATION. ❑ Warm weather soap solution - 5 gallons of water with 8 ounces of household dishwashing detergent. ❑ Freezing conditions soap solution - substitute 1 gal- lon of automotive windshield washer solution for 1 gallon of water. ❑ Cover entire tank outer surface with soap solution. (Exception - double-wall tanks with liquid filled an- nular space.) ❑ Cover all fittings with soap solution. ❑ Carefully inspect for leaks as indicated by bubbles. ❑ Roll tank to inspect bottom. Ensure fittings and/or collars do not contact ground. ♦ In the unlikely event a tank leak is discovered, discon- tinue the installation and immediately call Contain- ment Solutions Field Service to schedule a repair. ♦ Prepare fittings for testing ❑ Remove fitting plugs. ❑ Clean factory pipe dope from plugs and fittings. ❑ Apply pipe dope suitable for the material being stored in the tank. ❑ Reinstall and tighten fitting plugs. TESTING SINGLE-WALL TANKS These tests must be performed before installing tanks: ♦ Pressurize tanks. ❑ 4' through 10' diameter tanks to 5 psi maximum. 12' diameter tanks to 3 psi maximum. ❑ A contractor supplied pressure relief valve must be connected to the primary tank for additional pro- tection. The relief valve should be sized and set to prevent the tank from being pressurized in ex- cess of the maximum allowed test pressure. ♦ Maintain test pressure and continue inspection for at least 30 minutes. ♦ At the same time, cover tank outer surface with soap solution (see Visual Air/Soap Test). DO ♦ Use a maximum 15 psi air gauge with '/ or 1/2 Ib. increments. ♦ DO NOT approach endcaps or manways while tanks are under pressure. This could result in personal injury. ♦ DO NOT lift or hoist a tank under pressure. This could result in personal injury. DO NOT ♦ Use a vacuum gauge in lieu of a pressure gauge. TESTING DOUBLE-WALL TANKS WITH DRY ANNULARSPACE This section is for tanks which do not have monitoring tracer fluid installed. If tank arrives at site with monitoring fluid installed, use instructions for Double -Wall Tanks with Annular Space Filled on page 5. CONTINUED ON PAGE 5 5