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CLEANING OF PIPE 02 7310-2 1. A minimum of 700 feet of high pressure hose. 2. A 1,000-gallon minimum water tank, auxiliary engines and pumps, and a hydraulically driven hose reel. 3. Equipment operating controls located above ground. 4. Minimum working pressure of 1,000 pounds per square inch at a 50 gpm rate. 5. The equipment shall have a selection of 2 or more high velocity nozzles capable of producing a scouring action from 15 to 45 degrees in all size lines designated to be cleaned. 6. The cleaning units shall have high-velocity nozzles for washing and scouring manhole walls and floors. 7. The nozzles shall be capable of producing flows from a fine spray to a solid stream. B. High Velocity Hydrocleaning When utilizing high-velocity hydraulic cleaning equipment independently or in combination with other cleaning methods, a minimum of 2 passes with the hydraulic nozzle shall be done unless otherwise approved by the Engineer. If cleaning cannot be completed from one manhole, the equipment shall be moved and set up on the other manhole and cleaning shall be re-attempted. If successful cleaning still cannot be performed or the equipment fails to traverse the entire pipeline section, it shall be assumed that a major blockage exists. Efforts to clean the lines shall be temporarily suspended and the Contractor shall notify the Engineer. Upon removal of the obstruction, the Contractor shall complete the cleaning operation. C. Cleaning Precautions: During sewer cleaning operations, satisfactory precautions shall be taken in the use of cleaning equipment. When hydraulically propelled cleaning tools which depend upon water pressure to provide their cleaning force, or tools which retard the flow in the sewer line are used, precautions shall be taken to ensure that the water pressure created does not damage or cause flooding of public or private property being served by the sewer. Care shall be exercised to avoid pipe damage. D. Root Removal: Videotapes and TV log of existing pipes, if available, will be provided upon request for general guidance only. The CONTRACTOR is responsible for all findings made from these logs. The omission of noting on the Drawings of the existence of roots within a utility line shall not relieve the CONTRACTOR of the responsibility of removal of roots as part on the cleaning of the utility line. Roots shall be removed where shown on Video Tape or revealed by the CONTRACTOR’s television inspection. Special attention shall be used during the cleaning operations to assure removal of roots from the joints. Procedures may include the use of mechanical equipment such as rodding machines and bucket machines using root cutters and porcupines, and equipment such as high-