This project involved reconstruction of Mosside Boulevard in Allegheny County from existing two lane roadway to a four lane roadway with additional turning lane. Prime consultant, GAI, retained Tri-State Design and Development to design a replacement structure for an existing 89 ft. single span, dual girder steel bridge carrying S.R. 0048, Section A11 over a private access road in North Versailles Township, Allegheny County. The design required constructing the replacement structure while maintaining traffic at all times on the existing bridge (S.R. 0048) as well as on the private access road that passes beneath the existing structure.

Tri-State proposed constructing cast-in-place concrete walls bearing on deep piles supporting a 42 ft. single span CONSPAN Arch, while providing a 16 ft. minimum vertical underclearance. The structure was constructed under the existing S.R. 0048 structure, allowing embankment to be placed over the completed CONSPAN structure. Traffic was then diverted onto a temporary roadway allowing traffic to be maintained at all times.

The design of 146' long underpass was cost-effective, provided an extremely low maintenance replacement structure, and enabled the replacement of an existing two lane, high volume structure with a new four lane roadway without interruption of traffic. The project was completed in 2007.

Maintaining traffic all the time for the entire project was an important task due to very high traffic volume and lack of easy alternate choice of route. Tri-State prepared a multiphase Traffic Control Plan that allowed reconstruction of the entire project (including main multi-span bridge) with minimal inconvenience to the traveling public.

This project received the 2007 Outstanding Special Project (Culvert) Award by the Association of Bridge Constructors and Designers (ABCD).

Tri-State Design has substantial bridge safety inspection experience which includes over 250 state-owned bridges within Allegheny, Crawford, Mercer and Venango counties, and over 250 bridges owned by Allegheny County Public Works, Port Authority of Allegheny County and Airport Authority of Allegheny County. These bridges represent a wide range of minor to multi-span major bridges. We also have performed the inspection of several retaining walls, culverts and other structures.

Our scope of services for the above project included initial and biannual inspection of the Authority-owned bridges.

During the past five years, Tri-State Design, as a sub-consultant to Mackin Engineering, has performed in-depth and cursory inspections and analyses for several major and minor bridges for Port Authority of Allegheny County. These included transit bridges, railroad bridges over transit facilities, pedestrian bridges, and highway bridges.

Tri-State has also performed bridge inspection and design services under GAEC 93-07, and in-depth inspection and rehabilitation design of the Monongahela Incline.

Replacement design of a very narrow two-lane, 200' span through truss bridge and associated roadway. The geometry of the bridge approach was such that the grade of S.R. 1005 at the intersection with S.R. 1008 was substandard to the point of unacceptable. The scope consisted of redesigning and raising a portion of S.R. 1008 approximately 7' from the grade. This brought the high point of S.R. 1008, at its intersection with S.R. 1005, in compliance with current design criteria. The replacement bridge is a 204' two-span, continuous bridge. Due to anticipated encroachment in the waterway opening within a flood-prone area, approval of the H&H report was a critical item of work.

Tri-State was responsible for replacement bridge design, roadway design for S.R. 1005 and S.R. 1008, pavement design, drainage, ROW plans, MPT plans, erosion and sedimentation control plans, hydrologic and hydraulic report, and all other activities. This project was completed and opened to traffic during November 2003.

This project consisted of replacement of the existing three-span curve bridge over Conrail, and associated roadway. During the preliminary design phase, Tri-State investigated the feasibility of designing the bridge with a single span and reconstructing the roadway using retained earth walls (RE walls). The scope of the work had to be revised due to new environmental regulations.

The roadway was realigned to improve sight distance. Tri-State was also responsible for right-of-way, erosion and sedimentation control, MPT, safety review, PUC coordination, utility investigation, and all other associated activities. Hazardous waste and other environmental services were performed by our sub-consultant, Gannett Fleming, Inc.

Working as a sub-consultant to Baker Engineers for this high-profile, fast-track project, Tri-State performed preliminary design (TS&L) for eight structures carrying the Busway and Conrail Railroad. We also performed preliminary design for approximately 15,000 feet of retaining walls and noise walls, MPT and pavement markings. Our scope also included final design for four railroad bridges carrying Conrail Railroad and four Busway bridges.

• Airport Busway over Campbell's Run
• Station Street over Crennell Avenue
• Airport Busway over Chartiers Creek
• Airport Busway over South Main Street
• Conrail Railroad over South Main Street
• Airport Busway over Steuben Street (West End)
• Conrail Railroad over Steuben Street (West End)

• Airport Busway over South Main Street
• Two (2) Railroad Bridges over South Main Street
• Airport Busway over Steuben Street
• Two (2) Railroad Bridges over South Main Street.

Tri-State Design, working as a subconsultant to a major consulting firm, was responsible for the in-depth inspection and rehabilitation design for the following three structures:

1. Market Street Bridge
2. Stanwix Street Bridge
3. Retaining Wall Along Westbound Parkway West

The findings of the field inspection further refined the magnitude of the final design for this fast-track project.

Tri-State was responsible for the complete rehabilitation design, and construction phase services were completed December 2002.

This project consisted of the replacement of a single lane; 45' thru girder bridge over Campbell's Run. In order to meet the present design criteria, the proposed bridge had to be widened. However, one approach of the bridge being an adjoining major street, there was no space available for widening. At this location, Campbell's Run is confined by a retaining wall channel. During the TS&L stage, we coordinated our design with the U.S. Army Corps of Engineers, Pittsburgh District, to allow us to demolish part of the existing channel walls and build new abutment in the same place to support the new bridge superstructure. After completion, the new abutments became the walls for the channel. The structure length was reduced from 44' to 20', thus saving substantial costs and increasing under clearance. Tri-State was responsible for complete design, as well as construction management.

This project involves rehabilitation of an 8-mile portion of a 4-lane divided highway (I-79, Section A4). Tri-State was responsible for preparation of maintenance and protection of traffic plans, right-of-way plans, structure plans, and signing and pavement marking plans for the entire section. MPT plans included geometric, as well as pavement design for four (4) high-speed and nine (9) low-speed crossovers, including signing, ramp widening, and signing for the approach roadways. We also performed the inspection and inventory of all major and minor existing sign structures, and prepared new signing and pavement marking plans to meet present criteria for the mainline and exit ramps.

Scope of our bridge design consisted of rehabilitation design of a total of four (4) bridges.

The design was performed in an accelerated manner.

This project consisted of replacement of an existing 138', 3-span bridge and approach roadway. Due to the sharp skew and existing streets at each end of the bridge, the existing condition offered limited sight distance and sharp radii at the intersection of streets, making it difficult for large vehicles to turn on and off the bridge. Tri-State made extensive alternative studies during the TS&L stage, and proposed an 88' single-span bridge. The proposed bridge offered good sight distance, larger turning radii, more clearance over the railroad, and eliminated deep rock excavation in the vicinity of a residential neighborhood. A substantial cost savings was realized due to the proposed short span structure. Tri-State was responsible for complete design, including PUC coordination, utilities relocation, and roadway and structure design.

Working as a subconsultant to Baker Engineers for this high-profile, fast-track project, Tri-State performed preliminary design (TS&L) for eight structures carrying the Busway and Conrail Railroad. We also performed preliminary design for approximately 15,000 feet of retaining walls and noise walls, MPT and pavement markings. Our scope also included final design for four railroad bridges carrying Conrail Railroad and four Busway bridges.

1. S.R. 2015, Section B00, Erie County
   
   This project involved realignment and relocation of an existing roadway due to closure of the bridge along the existing road. Major activities involved included field survey, ROW plans, cost estimates, railroad grade crossing design, PUC coordination and other services.
   
   
2. S.R. 0006, Section 01C, Warren County
   
   Project involved raising an existing railroad bridge and lowering the roadway underneath to provide the required clearance. Major activities involved included field survey, substructure modifications, roadway design, drainage, and PUC coordination.
   
   
3. S.R. 0019, Sec. B00 & S.R. 0965, Section B00, Mercer Co.
   
   These two projects included minor realignment of existing roads and performing preliminary roadway and structures design. Major activities included field survey, H&H report including HEC II analysis; E&S control plans, preliminary roadway and structure design.
   
   
4. S.R. 0518, Section 01N, City of Sharon, Mercer County and others in Erie and Warren Counties
   
   These projects included signal modernizations in major central business districts. Scope of our services included traffic counts, analysis, signal timing, phasing, and preparation of intersection plans/signal plans. All services were provided by our in-house traffic engineers.

As a prime consultant to PennDOT District 10-0, we performed various engineering and environmental services for a variety of transportation projects. Under this contract, during a period of 30 months, we performed diverse services for eleven (11) small to medium-size work orders. We also coordinated the services of our geotechnical subconsultant, Earth, Inc., and our environmental subconsultant, Gannett Fleming, Inc. Tri-State was responsible for field survey; preliminary roadway design (Step 9); TS&L; traffic counts, analysis and signal design; preparation of H&H reports; E&S control plans and narratives, and ROW plans. Gannett Fleming, Inc. performed environmental services for most projects. Some of the projects assigned under this contract included:

• S.R.0036, Section 390, Clarion County
• S.R.1018, Section 290, Slippery Rock, Butler County
• S.R.0066, Section 390, New Bethlehem, Clarion County

These projects consisted of signal modernization and radii improvements at several locations. Tri-State performed field survey, peak hour traffic counts, traffic study analysis, signal optimization and preparation of signal plans and construction plans for radii improvements. As part of our study, we recommended restrictions on parking in two major CBDs. The work was performed under different work orders.

• S.R.0422, Section 190, Clarion County
  This project consisted of widening and adding a turning lane on a major arterial highway. We performed field survey, preliminary roadway design (Step 9) and cost estimates. Final design was performed by the District as a pilot project for metrication.
• S.R.3033, Section 550, Jefferson County
• S.R.3031, Section 450, Butler County
• S.R.1014, Section 450, Indiana County

These minor projects consisted of preliminary roadway and replacement bridge design. Tri-State performed field survey, preliminary roadway and bridge design, H&H reports including HEC II analysis; E&S control plans, and other related services. The work was performed under three different work orders.

Tri-State Design was engaged to design the replacement of an existing, deteriorated, six-span bridge and its approach roadways. The project included structural and roadway design, demolition plans, hydraulic and hydrologic studies, signalized intersection design, erosion and sedimentation control plans, lighting, and maintenance and protection of traffic. The total length of the project was 1,450 feet.

Several roadway alignments and structure types were investigated. The selected alignment placed the new bridge adjacent to the existing northbound structure. The selected structure type was a 346-foot long three-span continuous steel plate girder system with a reinforced concrete deck. The framing of the bridge consisted of four 5-foot deep girders at 10-foot spacings. The substructure units were reinforced concrete piers and abutments. Steel H-piles driven to bedrock support the abutments; the pier footings rest directly on bedrock. As part of this project, Tri-State designed a progressive movement, traffic actuated system to enhance traffic flow along this section of Route 50.

Tri-State received a perfect performance rating from the Department for its efforts on this project.

This project consists of replacement design for a group of 4 minor bridges within Allegheny County, with a combined total construction cost of $1.2 million.

• Girty's Run Bridge No. 14 (GI14), Ross Township
• Wible Run Bridge No. 5 (WB05), Shaler Township
• Homeville Creek Bridge No. 10 (HV10), Munhall Borough
• Licks Run Bridge No. 10 (LC10), South Park Township

Tri-State's scope of services includes field survey, environmental studies (CE's), hydraulic and hydrologic studies and reports, erosion and sedimentation control plans and narrative, stormwater drainage improvements, utility investigations, maintenance and protection of traffic plans, roadway design, replacement bridge design, and other related activities.

Tri-State Design has substantial experience in design of highway and transit bridges, roadway, and associated services.

Our scope of services for the above project included initial and biannual inspection of these bridges.