The City of Bixby entered into an engineering design service agreement with CGA Engineers, Inc. for the design of 1 mile or roadway improvements along N. Riverview Road from E. 151st Street to E. 161st Street. The project is located in Section 24 Township 17 North Range 13 East.
The scope of the project involves the following major design elements:
The project involves major roadway reconstruction and widening of existing two-lane paved road with open bar ditches drainage system to a three-lane roadway. The preferred alternative was an eight (8) inch asphalt pavement over eight (8) inches of ODOT Type A aggregate base typical section. The width of the pavement varies from section to section from 36 feet wide with paved shoulders to 36 feet curb and gutter section with concrete sidewalks on the east side to 48 feet wide with 2 foot paved shoulders. All driveways will be reconstructed and handicap access ramps designed to comply with ADA requirements are included. New pavement markings and traffic control plans were designed to meet current MUTCD stripping and signalization standards. The roadway widening included pay item quantities, plans and profile sheets, typical section, striping plans, construction sequence plans, details, plan sheets, cross sections and utility coordination.
The project also included stormwater improvements. A hydrology and hydraulics (H&H) analysis was done to evaluate the existing open drainage system. The design included a combination of an open drainage system, connecting existing underground pipes and evaluating critical sections to minimize flooding issues. This project also incorporates existing stormwater conveyance from the downtown area, west side drainage basin into the on-project drainage. Stormwater improvements included drainage area map, stormwater plan and profiles, inlet and pipe analysis and design. To meet current City standards per ODEQ requirements of the NPDES, a stormwater pollution prevention plan was designed.
The project required several utility relocations and improvements. The waterline and sewer line construction required coordination with private utility companies in the area. The waterline relocation included 5,000 feet of proposed 12-inch PVC pipe with Ductile Iron Fittings. The existing sanitary sewer was relocated to lie outside the proposed pavement to simplify future maintenance of the line.
The total engineer's construction cost for this project is approximately $2.2 million dollars.