A. GENERAL

1. Provide the ConVault Aboveground Tank System which carries listing and label under U.L. Standard 2085, INSULATED Secondary Containment Aboveground Tank for Flammable and Combustible Liquids, Protected Type with Vehicle Impact and Projectile Resistance. The Tank System will provide Emergency Venting for Secondary Containment by Form-of-Construction. Unit must comply with all provisions of U.F.C. 79-7, Appendix A-II-F. The Tank System and its enclosure shall be a completed unit at the factory (shop fabricated). The Tank System shall be approved for Phase I and Phase II Vapor Recovery by the California Air Resources Board for gasoline and methanol. Contact Core Engineered Solutions at (703)883-8176 or (800)826-5472.

B. PRODUCTS

1. Primary Tank: The primary tank shall be rectangular in shape, constructed with a minimum of 10 gauge thick carbon steel, listed per U.L. Standard 142, and meet the requirements of N.F.P.A. 30. Welds shall be continuous on all sides, conforming with the American Welding Society Standard for continuous weld. The tank shall be warranted for a minimum of 20 years by the manufacturer.

2. Concrete Encasement: The concrete encasement shall be 6" thick with a minimum design strength of 4000 psi. Concrete enclosure shall encase and protect both the primary steel tank and the secondary containment. The concrete design shall include the following for long term durability: less than 3% air entrainment, water-reducing admixture, and steel reinforcing bars. Concrete encasement shall be monolithic (without seams) and placement methods shall ensure the absence of voids on all sides and beneath the steel tank. An exterior steel jacket covering the concrete vault will NOT be permitted. The primary steel tank shall be prestressed at the factory by pressurizing to 3 psi during concrete encasement to allow for expansion and contraction. Vault enclosure shall have concrete support legs of unitized monolithic construction raising the concrete enclosure a minimum of 3" above the ground to meet visual inspection requirements. A mid-level seam or other joint construction which could compromise the liquid tightness (secondary containment) or fire protection capability of the vault is not permitted.

3. Fire Resistance: The Tank System shall be designed and tested to provide 2 hour fire protection for the primary tank as per U.L. 2085 2 hour furnace fire test and 2 hour simulated pool fire test. No steel members shall penetrate the walls or floor of the concrete encasement to assure isolation from pool fire heat.

4. Bullet Resistance: The primary tank must withstand the U.L./U.L.C. test for ballistics: impact of 5 bullets, (150 grain, M2 balls of ammunition) fired at a muzzle velocity of 2700 feet/second from 100 yards; the primary tank is then pressure tested at 5 psi air pressure to check for leakage.

5. Vehicle Impact Resistance: Unit must withstand U.L./U.L.C. test for impact resistance: unit must be subjected to the impact of an 11,800 pound mass moving at a velocity of 14.7 feet/second; following the impact, the primary tank is then pressure tested to check for leakage.

6. Thermal and Corrosion Protection: The Tank System construction shall include thermal insulation equivalent to .25 inches of polystyrene to protect against temperature extremes, and to protect against corrosion by isolating the steel tank from the concrete or other corrosive material. All steel exterior to the concrete encasement shall be antioxidant powder coated to inhibit corrosion and meet A.S.T.M. B117.

7. Secondary Containment with Leak Monitoring: Unit construction must provide Emergency Venting for Secondary Containment by Form-of-Construction according to U.L. Standard 2085 which meets testing criteria. The Tank System shall include an impervious barrier of 30 mil high density polyethylene to contain leaks from the primary tank.

8. Spill/Overfill Containment: The Tank System shall include a U.L. listed 7 gallon spill/overfill container manufactured as an integral part of the primary tank, surrounding the fill pipe, and protected by the 2 hour fire rating of the enclosure. The spill/overfill container shall include a stick port and normally closed valve to release spilled product into the main tank. Exterior steel shall be antioxidant powder coated to inhibit rust.

9. Overfill Protection: Overfill protection shall be provided by one or more of the following methods: a) direct reading level gauge visible from fill pipe access; b) valve rated for pressurized delivery located within fill pipe to close automatically at 95% full level; c) audible/visual high level alarm.

10. Exterior Finish: The tank system shall be: natural aggregate with two part, weather resistant coating; two part, white epoxy exterior coating on the top and sides to resist weather and to reflect sunlight; or STO finish.

11. Signage: Tanks shall be marked on all sides as per state and local codes. Signs will be recessed in concrete exterior to insure against damage during off-loading, refilling or general functions.

12. Venting: Tank system shall include a 2" atmospheric vent and emergency venting in accordance with N.F.P.A. 30.

13. Anti-Spill Valves: Where product piping extends below the top of the tank, the piping shall include a shutoff valve and normally closed safety valve. The safety valve shall be an approved anti-siphon valve or electric solenoid valve.

C. EXECUTION

1. Manufacturer will have a minimum of 5 years experience in producing specified tank for commercial use and document at least 10 installations in satisfactory operation.

2. The tank system including accessories shall be installed in strict accordance with the manufacturer's recommendations and applicable fire and environmental codes. All state and local permits shall be obtained by contractor prior to installation.

3. Tanks shall be installed on a reinforced concrete base slab designed to support the fully loaded tank. Protective bollards shall be installed where required by state and local codes.

4. Tanks shall be marked on all sides with warning signs: "FLAMMABLE" or "COMBUSTIBLE", "NO SMOKING", product identification, and other signs as required by applicable codes.

5. Electrical work shall be in accordance with applicable codes and shall be rated for hazardous area as required. Electric feed for dispensing pumps shall include an emergency shutoff switch located per code requirements. Tanks shall be electrically grounded in accordance with N.F.P.A.78.

6. Any proposed equal alternatives to this specification must be submitted for review and approval prior to bid opening. All expenses incurred for such review to be paid for by bidder.

Rev.2/01