Pre-Cleaning Requirements • Contractor shall coordinate with DPW staff for station shutdowns, bypass pumping (if required), and confined space entry permitting. • Lockout/Tagout procedures must be followed for all electrical and mechanical equipment. • Gas monitoring for oxygen, H₂S, LEL, and CO must be performed continuously during entry. Cleaning Method • Hydro-Vacuum Truck: Use a high-powered combination sewer cleaning truck capable of vacuuming wet solids, rags, grease mats, and grit. • Water Jetting: If necessary, employ controlled water jetting to break up compacted solids. Avoid damage to pumps, piping, sensors, and coatings. • Manual Debris Removal: If manual entry is required, follow OSHA 29 CFR 1910.146 for confined space entry. Material Disposal • Debris and liquid waste may be transported to Upper Blackstone Clean Water, 50 Route 20 Millbury MA,subject to their approval of the hauler and the waste. Haulers must obtain a waste hauler license from Upper Blackstone Clean Water. • Contractor must provide weight tickets or disposal receipts for all material removed. Upper Blackstone’s truck scale may be used for this purpose by licensed waste haulers. • Contractor must coordinate with Upper Blackstone prior to cleaning any wet well. Debris can only go to the Upper Blackstone landfill under certain conditions and during certain operating hours. Contractor will contact Upper Blackstone’s administrative staff by phone at (508) 755-1286 during regular business hours; prior notice shall be given not less than 24 hours in advance. Upper Blackstone must approve of all wastes disposed of. • If Upper Blackstone Clean Water rejects disposal at the proposed location, the contractor must transport and dispose of the material at an alternate approved facility.
