For the SR 3014 Atherton Street Corridor Highway Improvement Projects agreement in Centre County, NTM provided drainage, stormwater management, and erosion and sedimentation control design services; H&H analysis and Joint Permit Application for the stream enclosure on Big Hollow Run; and NPDES permit document preparation.
Over the years, PennDOT and local municipalities have made numerous repairs to Atherton Street, because of cave-ins and sinkholes caused by drainage facilities failure. The design team is working to ensure that the existing drainage system capacity is sufficient for current and future anticipated demands. NTM is evaluating existing drainage conditions and designing cost-effective solutions to meet the project goals. The project included betterment improvements along seven miles in Patton, College, and Ferguson Townships and the Borough of State College.
One of the primary goals of this project is to improve pavement surface drainage, flow capture, and conveyance along this section of Atherton Street. During larger storm events, the pavement surface floods from excess surface runoff causing hazards to vehicular and pedestrian traffic. Some gutter spread issues have also been observed in areas of non-standard pavement cross slopes and low longitudinal slopes. Proposed drainage improvements include improvements to roadway cross slope and gutter slope, addition of new inlets, replacement of aging storm drain pipes, and upsizing storm drain pipes where needed.
The project involves milling and overlay of the existing pavement, select full depth pavement repairs, storm drain pipe and other drainage upgrades, curb ramp upgrades, and signal upgrades (primarily modifications to loop sensors and pedestrian pushbuttons necessitated by other elements of the project). The project passes through the State College urban core, consisting of university buildings, businesses and retail centers, and continues through an adjacent suburban area with a mix of residential and local commercial properties.