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Independent laboratory tests of the carts bid must accompany bid samples certifying compliance as specified in part 2 of the detailed specifications. Wheels: Two (2) wheels with self - lubricating bearings with a minimum load rating of 120 lbs. per wheel. Wheels shall be attached to the axle via a tamper resistant snap -on method which contains no metal components. No cotter pins, "Pal nuts" or similar restraining devices shall be utilized to attach the wheel. All wheels shall be 1.75 inches wide. Wheels shall be easily removed for replacement with a non - commercially available tool. Wheel Sizes: Size A: 8 inches Size B: 10 inches Size C: 12 inches 4. Axles: Axles shall be solid steel and electro- plated with black zinc for durability and long life. Carts should be designed in such a way as to prevent the axle from popping out. An axle, which is only press fitted and not secured in some additional manner will not be acceptable. Axle Sizes: Size A: 5/8 inch Size B: 6/8 inch Size C: 7/8 inch Lids: Lids shall be molded of the same material as the cart body and shall be permanently attached to the cart body with plastic hinge(s). Metal fasteners are not acceptable. Lids shall be watertight and slightly domed to facilitate rum -oft' of rainwater. The lid shall be designed to fold over parallel to the back side of the cart when fully opened. Lids shall be factory assembled. 6. Locking Bar: The semi - automated lifting area shall be integrally molded with the body of the cart. The locking bar shall be able to rotate a fall three- hundred sixty (360) degrees and shall be constructed of zinc - coated steel to prevent rust and corrosion, Plastic locking bars are unacceptable. Certification by a certified independent laboratory shall be required of the following minimurn standards and quality assurance measurements: 7.1 Drop Impact Test - material and weight shall be cold soaked at a temperature of not less than -20 F for 24 hours and dropped within 60 seconds of leaving the cold chamber. Carts shall remain watertight after a minimum drop height of 15 feet. Test loads are as follows: Size A: 120 lbs. distributed Size B: 160 lbs. distributed Size C: 180 lbs, distributed 7.2 Lift and Dump Test - shall verify the cart's compatibility with approved, commercially available, standard dunnping equipment. Test shall be performed at room temperature with a cycle time that simulates lift, dump and return of 6 25 -44