The SR 4006 Kiester Bridge project includes replacing an existing two-span steel I-beam bridge with a single-span steel girder bridge. NTM performed stormwater management, erosion and sediment control, and drainage design; hydrology and hydraulics analysis; and NPDES permitting for this project in Slippery Rock Township.
NTM Engineering provided the Post-Construction Stormwater Management (PCSM) Plan, Erosion and Sediment Pollution Control (E&S) Plan, NPDES (stormwater) Permit, and Dam Safety Permit for 1.25 miles of roadway widening (from two to four lanes and from three to six lanes) along SR 0228, Mars-Valencia Road. Design challenges included discharging to waters with 303(d) impairments, soils […]
NTM Engineering, in conjunction with SKELLY and LOY, Inc., modeled the hydrology and hydraulics (H&H) of the Borough of Carlisle’s storm sewer system to determine the cause of the drainage and flooding problems that disrupted traffic and caused economic damage. NTM performed data collection of the problem areas, used LiDAR data, surveyed storm sewers, provided […]