The City of Vermilion entered into a cooperative agreement with Erie County to permit sewer extensions south of the corporate limits along the S.R. 60 corridor. KS had prepared preliminary designs for the City, which indicated that the sanitary sewer along Douglas Street would need to be increased in capacity before the County could take advantage of sewer service. Douglas Street was a densely populated residential street with a sanitary sewer system which is located beneath the asphalt pavement.
KS Associates was retained by the City to prepare plans and specifications, provide customary bidding services and provide construction administration and resident project representation for this project. In the final design phase it was determined that a complete sewer replacement would be the economical solution, preferable to construction of a relief sewer. KS prepared the alternatives analysis which was the basis for this design decision.
The project consisted of the installation of 150 lineal feet (L.F.) 24-inch and 825 L.F. 18-inch reinforced concrete sewer at a depth of approximately twenty (20) feet.
Plans and specifications were prepared and bids were received in November 1991. KS provided all bidding services including responding to bidder inquiries regarding interpretations of the plans and specifications, attending the bid opening, tabulating bids, verifying contractor references and making a recommendation of contract award to the City. The low bidder came in at $88,153.
The construction began in December 1991, with KS deploying one resident project representative for the duration of the contract. The primary challenge during construction was maintaining sewer service to the residents while replacing the old vitrified clay sewer. The City chose not to perform a pre-construction videotaping of the existing sanitary sewer, preferring, in the interest of cost saving, to rely upon record locations of sanitary laterals. All laterals were successfully located based upon the record drawings except one, which had to be field located using electronic equipment.
Sewer testing included an air test of each individual pipe joint along with televising the completed installation. A qualified testing subconsultant was retained by the contractor for this work.
KS represented the City's interests in requiring the contractor to minimize inconvenience to the neighbors. When the final asphalt pavement subsided in the trench line less than one month after paving operations, KS required the contractor to restore the street to the plan elevation in a timely manner, and at no additional cost to the City.