1801 RES CITY COUNCIL AT ITS REGULAR MEETING ON 14TH DAY OF MARCH 1977 APPROVED ADVERTISEMENT FOR BIDS

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TECFiNICAL SPECIFICATIONS HI-PRES5URE PIATER CLEANING A. SCOPE: Furnish and install a11 labor, equipment, and materials, necessary to thoroughly clean all exterior manonry and stone walls, as specified herein. B. QUP.LIFICI,TIONS OF WORKMEN: Only skilled and experienced mechanics, engaged full time in Hi-Pressure Water Cleaning, shall be permitted to do the Hi- Pressure cleaning herein described. C. PREPARATIOD7 OF SURFACES: Provide aZl necessary shields, barriers, window and door pro- tections, in order to properly execute this work with the least possibZe inconvenience to the occupants and general public using the building. D. APPLICATION: All exterior masonry and stone surfaces as described shall be cleaned by the Hi-Pressure tti7ater Cleaning Method. The purpose of this cleaning method is to thoroughly remove all dirt, grime, discoloration, and loose particles from the surface of the masonry and stone walls in such a manner as to cause no disruption and harm to the face of the masonry or stone. The action of this cleaning method is to be one of scouring and scrubbing only. The pump used to develop this pressure is to be gasoline or diesel driven, capable of maintaining pressure of 1200 P.S.I. at minimum elevation of 300 feet above the pump. A special nozzle design will be used to project the water at 1,000 to 1,200 pounds pressure. This nozzle is to contain a de- vice allowing the water stream to be aerated thereby breaking up the force of the water stream as the results of aeration. If necessary, where dirty surfaces require, the masonry or stone wall surface shall be soaked prior to cleaning with the Hi-- Pressure Water Nozzle by previous wetting with hose or perforated pipe. Where extremely dirty areas occur it may also be necessary to draw through the top of the aerating nozzle a fine aggregate or sand approximately 50 to 60 mesh to remove these areas of dirt. TS-1