All bid proposals must be sealed and labeled, "Bid Proposal: Fog Sealing Using Asphalt Emulsions." Specifications can be found attached to this notice on the Town's Website or obtained by emailing the Town Clerk, clerk@exetem.gov, or phoning, (401) 294-3891, Ext. 9 or by emailing Public Works, publicworks@exeterri.gov, or phoning, (401) 295-1983. The bid will be awarded on the basis of the lowest qualified bid price or the lowest evaluated or responsive bid price. The Town of Exeter reserves the right to reject any or all proposals or any parts thereof, to waive any informalities and/or technicalities in same, or to accept any proposal deemed to be in the best interest of the Town, whether or not it is the lowest bid. Suitable storage and handling facilities shall be provided for the emulsion, to 1. Prevent contamination of water, oils, or other liquids. 2. Prevent contamination by other incompatible emulsions. 3. Protect from freezing and boiling temperatures that break the emulsion and cause separation into asphalt and water. 4. Protect from local overheating caused by high temperature heating coils and surface heating pads. Use of hot water is recommended for heating emulsion. Where steam, hot oil or direct fire must be used, controls must keep coil surfaces below 85C (185 F). Recommended spray nozzle sizes are 3.2 to 4.8 mm (1/8 to 3/16 in.). Spray nozzle angles should be adjusted using nozzle wrench provided by equipment distributor or manufacturer and spray bar height adjusted to produce correct overlap. A hand sprayer should be used for applying small amounts of tack to cleaned potholes and utility cuts prior to filling or patching, as well as to small areas which cannot be sprayed by the distributor. 5. Use bottom loading wherever possible or employ full-length drop hose to eliminate foaming. Foaming may cause a volume gauge error. 6. Allow surface crust that may form on emulsion in storage to float without disturbance. Vertical tanks can help maintain constant and minimal surface area. Return lines into tanks should have outlets near the tank bottom and circulation should not free fall or disturb surface crust. 7. Reduce high shear that can break emulsions by enlarging clearances on new gear pumps by milling if necessary. 8. Prevent unnecessary circulation that can cause drop in emulsion viscosity and emulsion instability. 9. Do not agitate emulsion with forced air as it may cause the emulsion to break. A properly calibrated emulsion distributor or a hand sprayer shall be used for spraying emulsions. ASTM D2995 can be used for distributor calibration. The distributor shall be free of any contaminants that can harm the emulsion. A pump for continuous circulation of emulsion through the spray bar shall be provided. Pumps should have a greater clearance for use with emulsions than with other asphalts at least 0.76 mm (0.030 in.) to prevent over-shearing. This can cause breakdown of the emulsion particles, especially in their diluted form. Pressure created within the distributor should be as low as possible. Heat applied to the tank or spray bar shall not exceed 85C (185 F) at any point, which would boil the emulsion and cause it to break, plugging the nozzles with asphalt. Recommended spray nozzle sizes are 3.2 to 4.8 mm (1/8 to 3/16 in.). Spray nozzle angles should be adjusted using nozzle wrench provided by equipment distributor or manufacturer and spray bar height adjusted to produce correct overlap. A hand sprayer should be used for applying small amounts of tack to cleaned potholes and utility cuts prior to filling or patching, as well as to small areas which cannot be sprayed by the distributor. Existing surface shall be repaired as directed by the engineer prior to further construction. The emulsion will flow into the small cracks and seal them, but it cannot be expected to take the place of adequate repair of major deterioration of the pavement. The surface shall be free from dust, lose or foreign matter and any objectionable material that would hinder adhesion of the emulsion. If the dust layer is minimal and brooming is not deemed necessary, a very light 0.68 L/m2 (0.15 gal/yd2) spray of clean water prior to application can significantly improve adhesion of the tack coat or penetration into the surface cracks by the fog seal. Allow excess water to run off before applying emulsion. Parking lots or other areas with heavy oil drippings should be cleaned with detergent or by other methods prior to spraying with emulsions. Spray application of emulsions should be avoided prior to probable rainfall and will not be applied during rain. High humidity will slow the emulsion break. Pavement and air temperatures should be above 10C (50 F). With extreme hot, dry conditions, it may be advantageous to lightly dampen the surface to be sprayed with 0.68 L/m2 (0.15 gal/yd2) water to prevent premature break of the emulsion.