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CITY OF EVERETT SPECIAL PROVISIONS <br /> <br />3rd Ave Water Quality Facility Division 7 – STORM, SEWER, WATER September 12, 2024 <br />WO No. – UP 3775 SP – 181 <br /> <br />Pretreatment Unit Installation <br />The Contractor shall exercise care in the storage and handling of the water quality <br />treatment structure components prior to and during installation. Any repair or <br />replacement costs associated with events occurring after delivery is accepted and <br />unloading has commenced shall be borne by the Contractor. <br /> <br />All components shall be subject to inspection by the Owner. All components are subject <br />to being rejected or identified for repair if the quality of materials and manufacturing do <br />not comply with the requirements of the Plans and Special Provisions. Components <br />which have been identified as defective may be subject for repair where final acceptance <br />of the component is contingent on the discretion of the Engineer. <br /> <br />The Pretreatment Unit shall be constructed according to the sizes shown on the Plans <br />and as specified herein. Install at elevation and location shown on the Plans or as <br />otherwise directed by the Engineer. The subgrade and backfill shall be compacted to <br />95 percent of the maximum density as determined by the compaction control tests <br />described in Section 2-03.3(14)D. <br /> <br />Place the precast base unit on a granular subbase of Crushed Surfacing Base Course <br />with a minimum thickness of six inches after compaction. The granular subbase shall <br />be checked for level prior to setting and the precast base section of the trap shall be <br />checked for level at all four corners after it is set. If the slope from any corner to any <br />other corner exceeds 0.5% the base section shall be removed and the granular subbase <br />material re-leveled. <br /> <br />Pretreatment Unit shall be installed per manufacturer recommended with approval by <br />the Engineer. <br /> <br />Holes made in the concrete sections for handling or other purposes shall be plugged <br />with a nonshrink grout or by using grout in combination with concrete plugs. <br /> <br />Where holes must be cut in the precast sections to accommodate pipes, do all cutting <br />before setting the sections in place to prevent any subsequent jarring which may loosen <br />the mortar joints. The Contractor shall make all pipe connections. <br /> <br />Structure lids shall be adjusted and grouted to match existing road grades. <br /> <br />7-06.3(3) Water Quality Treatment Facility <br />The Water Quality Treatment Facility shall be surrounded by the gravity block wall <br />conforming to Sections 8-24 and the details in the Plans and provided by the Contractor. <br />The wall shall house the proprietary treatment soil mix media and components as <br />indicated in the Plans. All internal components shall be provided by the manufacturer <br />through coordination by the Contractor, except as otherwise indicated herein. <br /> <br />Internal Components: