WBCM was the Lead Design Consultant for Corman Construction Inc. as part of the Design/Build Hampstead Bypass. The project created a bypass for MD 30 around the Town of Hampstead in Carroll County, Maryland. MD 30 has previously experienced severe congestion through the Hampstead during peak hours and it was estimated that approximately two-thirds of the traffic would divert to the new route, enabling the Town of Hampstead to redevelop the downtown area in accordance with its Main Street Revitalization Plan.
WBCM was responsible for the design of the relocation of MD 30 from south of Wolf Hill Drive to north of the Town of Hampstead, a distance of 4.4 miles. WBCM designed new roadway, three roundabouts, four bridges, 3,500 lineal feet of noise wall or noise berms, 13 stormwater management facilities, erosion and sediment control, signing, lighting, traffic signals, and water and sewer relocations. The project required 928,000 cubic yards of cut, 760,000 cubic yards of embankment, and extensive landscaping.
The three roundabouts are located at the southern end of the project, at the intersection of MD 482, and at the northern end of the project. The roundabout at the southern end of the project ties the Bypass into existing MD 30 and connects a relocated access road (Phillips Drive) into the Wolf Hill subdivision as the existing access to the subdivision, which was directly from MD 30, was closed. The roundabout at MD 482 is located approximately midway through the project. The roundabout at the northern end of the project ties the Bypass back into existing MD 30.
The four bridge structures include: a single-span precast concrete girder bridge carrying relocated Houcksville Road over the Bypass; a single-span steel girder bridge carrying the Bypass over Shiloh Road; a single-span precast concrete girder bridge carrying the Bypass over Indian Creek; and a single-span precast concrete girder bridge carrying the Bypass over a wetland and stream. WBCM performed HEC-RAS modeling to size bridge openings. Scour analysis was performed using SHA ABSCOUR program.
The Bypass crosses numerous sensitive environmental areas including ten major streams, some which are classified as Use 3 and Use 4 waters, and a bog turtle habitat. To ensure the safety of the federally-protected bog turtles, WBCM designed a bog turtle barrier to prevent the turtles from accessing the roadway and a stormwater management facility that can contain a 10,000 gallon spill during the two-year storm event.
WBCM designed the relocation of numerous utilities, including extensive sanitary sewer relocations and protection of existing sanitary sewer lines. WBCM’s design extended 125 linear feet of 20-inch split steel sleeve casing protection over an existing 8-inch sanitary sewer at stations; 147 linear feet of 20-inch split steel sleeve casing protection over an existing 10-inch sanitary force main at stations, and relocated 220 linear feet of 8-inch ductile iron sanitary sewer pipe.
WBCM also provided extensive permitting services including the preparation of the Joint Permit applications for impacts to wetlands.
Maryland State Highway Administration
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Environmental Water Resources