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Garver provided surveying, design, bidding, property acquisition documents, and construction phase services for the line and lift station work in the White River Watershed.
The East Line Force Main and Lift Station 19 projects consisted of abandonment of the existing lift station and constructing a new larger capacity lift station and force main to meet Fayetteville’s existing and future needs. The new 1,800-gpm lift station major items included a new wet well, valve vault, submersible pumps, pump controls, odor control, emergency generator, 2,000 cubic yards of rock excavation, piping, and valves. The new force main consisted of approximately 4,000 linear feet of 16-inch force main that paralleled the existing 8-inch force main. The new force main crossed the White River by open cut. The new force main configuration will allow discharge to either the existing 36-inch sewer that parallels the East Line Gravity Line or to the EL-2 Gravity Line (New 42-inch Gravity Sewer). The existing 8-inch force main was maintained and cross connections to the new 16-inch force main were added for additional controls.
The East Line Gravity Line consisted of installation of approximately 5 miles of 42-inch gravity sewer on a curvilinear alignment by joint deflection consisting of both ductile iron pipe with ceramic epoxy liner and fiberglass reinforced pipe with vinylester liner, 1,240 linear feet of 18-inch to 36-inch gravity sewer, 70 manholes, 2 junction boxes including slide gates, one state highway bore, 170 reinforced concrete piers for 10 locations up to 18 feet in height, 82 concrete anchors, water loading station, 20,000 square feet of interior epoxy coating, a 60 feet span structural steel bridge for 42-inch gravity sewer to maintain three existing high pressure gas lines, the permanent diversion of flows around and abandonment of an existing sanitary sewer Lift Station 21, force main connections and relocations, multiple cross connections between the existing 36-inch sewer and 42-inch sewer, and modifications to 30 existing manholes along the 36-inch sewer. The rehab work on the existing manholes along the 36-inch included exposing them to atmospheric pressure and applying an interior epoxy coating. The gravity line is primarily buried with depths up to 33 deep and significant rock excavation totaling nearly 21,000 cubic yards. It also has approximately 3,300 linear feet of above ground emplacement. The new East Line Gravity Line paralleled an existing 36-inch sewer that operated as a force main during high flows.
A significant portion of the flows emanate from the Fayetteville Industrial Park. These flows exhibit a unique, reportedly caustic nature. Because of the unique nature of the waste stream, major efforts were dedicated to the investigation and design of pipe and manhole lining materials. Other issues involved designing the new lines within mostly existing easements, maintaining existing utilities through developed parts of the City, maintaining normal flow rates while diverting flows from existing, obsolete lines to the new lines, and environmental considerations including wetlands and multiple stream crossings. |
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