The City of Vermilion selected KS Associates to design a new 10-inch forcemain to replace an undersized 8-inch forcemain on Sandusky Street between South Street and the Vermilion River. KS Associates, working closely with the Utilities Department, conducted a series of tests on the Park Drive Pump Station. The conclusion was that the station was not pumping at design capacity for three reasons: the physical inside diameter of the 8-inch pipe was restricted (possible reasons being tuberculation or corrosion) causing it to convey flows as if the inside diameter was 5 ½-inches; the forcemain route needed to be shortened to improve head losses, and the forcemain diameter of 8-inch was insufficient to carry the design capacity of the station.
Contract 1 of the force main improvements consisted of the rerouting of the forcemain along Sandusky Street and up-sizing to 10-inch and cleaning the 8-inch forcemain under the Vermilion River using a method known as “pigging." The design of the construction along Sandusky Street accommodated the many utilities already occupying the right of way including two gas mains, one gravity sanitary sewer, one force main, two water lines and a storm sewer. The pigging operation needed to be performed at night, during off-peak sewage flow periods.
At the request of the City, KS made application to the Ohio Public Work Commission (OPWC) for a grant of $75,000 for the forcemain improvements. The full amount of the grant request was awarded. KS Associates prepared plans, specifications and an opinion of probable construction costs for the project, which included 1,323 lineal feet of 10-inch ductile iron pipe and appurtenances.
The low bidder for the forcemain construction came in at $110,567, which was 11.5% below the Engineer’s Estimate.
The City requested that KS provide construction administration services and a full-time resident project representative (RPR) for the construction phase of the project. Construction started in April 1997 and was completed in June 1997. KS held monthly progress meetings with the contractor and the owner, processed pay estimates, reviewed certified payroll reports, processed change orders, and processed draw requests through the OPWC. KS also administered a second prime contract for the pigging operation.