1993 Specifications CSJ 0271-17-138,etc

SPECIAL PROVISION 000--3223 Description of Project, Scope of Contract and Sequence of Work

1. Description of Project. (1) General. This project provides for the construction of new frontage roads for IH 610 from Richmond Avenue to Westpark Drive and a northbound connector for the proposed Westpark Tollway from the intersection of Westpark Drive and the IH 610 southbound frontage road to the intersection of Richmond Avenue and South Post Oak. It is located in Harris County within the IH 610/US 59 interchange. Traffic signal improvements at two locations on Westpark Drive are included. This project is a construction of the overall Westpark Tollway construction. TxDOT construction begins at Westpark Tollway Connector Station 682+29 (which is the south right-of-way line of Connector F). The work to be performed under this contract will be the construction of new location non-freeway facilities consisting of grading, storm sewer, lime treated subgrade, cement stabilized base, asphaltic concrete pavement, concrete pavement, retaining walls, various bridge structures, storm water pump stations, detention facilities, utility adjustments, signing and pavement markings, illumination and signals. (2) Roadway. Preparing right-of-way for this project includes existing right-of-way as well as acquired right-of-way adjacent to the southbound US 59 frontage road. Removal of existing roadway pavements, slope pavements, retaining walls, and bridge structures will be paid for under the appropriate bid items for removing pavement or structure. Items not covered by bid items will be removed under preparation of right-of-way. Grading for this project consists of excavation for frontage roads and Tollway Connector. Embankment material required for this project will be obtained from project excavation. Pavement for the frontage road rigid paving section shall be 9-inch continuously reinforced concrete pavement with one layer of reinforcing steel. Pavement for the Tollway Connector shall be 12-inch continuously reinforced concrete pavement. All concrete pavement is to be supported on a 6-inch layer of cement treated base and a 6-inch layer of lime treated subgrade. Depressed roadways will have a 7-inch layer of filter material between the base and subgrade. (3) Storm Sewers. The storm sewer work consists of the construction of new trunk line systems with inlets and leads. These systems will be located as shown on the plans. (4) Detention Basins. Two facilities will be constructed, one on each side of IH 610 between US 59 and Westpark Drive as shown on the plans. The detention basins receive

1-7 000--3223 07-01 both gravity and pumped inflow and outflow ultimately to the existing box culvert on Westpark Drive. (5) Storm Water Pump Stations. Two storm water pumping facilities will be constructed and are located adjacent to each respective detention basin.

(6) Structures. (a) Southbound frontage road bridge over Tollway Connector. Construct single span prestressed concrete beam superstructure with drilled shaft abutment foundation. (b) HOV bridge over southbound frontage road and Tollway Connector. Construct single span prestressed concrete beam superstructure. Abutment foundation is common to drilled shaft retaining walls for frontage road depressed section. Phased construction is required to accommodate existing HOV traffic. (c) US 59 bridge over southbound frontage road and Tollway Connector. Construct single span prestressed concrete beam superstructure. Abutment foundation is common to drilled shaft retaining walls for frontage road depressed section. Phased construction is required to accommodate existing 4 lanes of traffic each direction.

(d) Connector “B” bridge over southbound frontage road and Tollway Connector. Construct two span prestressed concrete beam superstructure. Abutment foundation is common to drilled shaft retaining walls.

(e) Connector “H” bridge over southbound frontage road and Tollway Connector. Construct four span prestressed beam superstructure. Straddle interior bents have steel caps. (f) Connector “G” bridge over northbound frontage road. Construct three span prestressed concrete superstructure. (g) Connector “A” bridge over northbound frontage road. Construct three span prestressed concrete superstructure. (h) HOV bridge over northbound frontage road. Construct single span prestressed concrete beam superstructure. Abutment foundation is common to drilled shaft retaining walls for frontage road depressed section. Phased construction required to accommodate existing HOV traffic. (i) US 59 bridge over northbound frontage road. Construct single span prestressed concrete beam superstructure. Abutment foundation is common to drilled shaft retaining walls for frontage road depressed section. Phased construction required to accommodate existing 4 lanes of traffic each direction. (j) Connector “D” bridge over northbound frontage road. Existing connector deck is to be replaced with rail retrofit, and bent replacement for north three spans. (k) Connector “E” bridge over northbound frontage road. Construct three span prestressed concrete beam superstructure.

2-7 000--3223 07-01 (l) Connector “F” bridge over northbound frontage road. Construct three span continuous steel plate girder structure. (m) Southbound frontage road and Tollway Connector. Construct single span prestressed concrete beam superstructure. (7) Retaining Walls. Drilled shaft retaining wall systems will be used for the depressed frontage roads and Tollway Connector. The shafts will be faced with precast panels and topped with a coping the full width of the drilled shafts. At critical height locations, tie backs are used for wall support. (8) Signing. The signing for this project consists of small and large ground mounted regulatory and warning signs. The work includes the fabricating, furnishing and erecting of sign mounts and sign panels. The signing work also consists of the removal or moving of various ground mounted regulatory and warning signs and large signs. In addition, various ground mounted and overhead warning, regulatory and guide signs are to be furnished and erected for traffic handling purposes. Temporary removal, relocation and restoration of some signs are required. (9) Signalization. The two proposed new and modified signal installation for this project are located at the northbound frontage road and southbound frontage road intersections with Westpark Drive. (10) Traffic Control Plan (TCP). This project’s construction will be divided into four phases. Each phase that requires temporary construction widening or detours and is subdivided into two or more steps. Step 1 is for all temporary construction and subsequent steps are for permanent construction.

2. Scope of Contract. (1) General. The Contractor will not have the exclusive use of the right-of-way, but shall operate in the use of the right-of-way with the Texas Department of Transportation (TxDOT), Harris County Toll Road Authority and various utility companies and their contractors and the City of Houston and/or their contractors. No extra compensation will be made for any delays occasioned by the work of the above listed entities; however additional working time may be granted if, in the opinion of the Engineer, it is justified. Notice of an extension of work time shall be given to the Contractor in writing by the TxDOT. (2) Data on Existing Utilities. All utilities that should be adjusted are to be adjusted by their respective owners to clear construction proposed by this project except as noted elsewhere on the plans. Should the Contractor encounter any other utilities such as sewers, water lines, gas lines, etc., it shall be his responsibility to contact the respective utility companies as soon as it becomes apparent that they will interfere with the work. The State shall not be responsible for any delay in the work caused by such existing utility lines; and no time will be credited to the Contractor due to any delay caused by the unanticipated necessary adjustment of utilities except by the Engineer in writing. It 3-7 000--3223 07-01 is specifically understood that if the Contractor is delayed by virtue of the adjustment of utilities that this delay will not be considered as a basis for a claim by the Contractor. (3) Traveling Public. The safety and convenience of the traveling public passing through this project is an important function of this contract and shall be regarded by the Contractor. Existing traffic is to be maintained except as noted herein. Portions of the work on this contract is along and between existing freeways and direct connectors carrying large volumes of traffic, and some of the work to be performed will require that certain direct connectors be temporarily closed in order to perform the work. Connectors A, B, C, D and F will be closed for construction of structures across the depressed frontage roadways to be constructed. All other construction will be accomplished with maintaining present traffic. The limits of sections in which lane closing are to be accomplished will be selected judiciously so as to minimize interference to traffic. A proposed sequence of work and a proposed traffic control plan have been provided in the plans and specifications to facilitate the movement of traffic through this project. The Contractor’s attention is directed to plan sheets showing typical lane closure signing and barricade details. If it is decided that temporary construction in addition to that shown on the plans is required to accommodate the traveling public, then this additional construction shall be done by the Contractor, as directed by the Engineer and paid for at the contract unit prices bid for the various bid items involved. If emergency work or major accidents necessitate closing of the mainlanes in or adjacent to sections occupied by the Contractor, the Engineer may direct the Contractor to cease operations and remove his men, materials, and equipment from the roadway until such emergency work is completed or the accident is cleared. Unless otherwise directed by the Engineer, single lane closures adjacent to the work for revision of pavement markings shall be in accordance with the lane closure schedule.

3. Sequence of Work. (1) General. Preparing right-of-way shall be performed to accommodate Phase 1 of the TCP prior to preparing right-of-way for the remainder of the project. The TCP for this project shall be as outlined herein and as detailed on the plans. The TCP will show the sequencing of work for this project. It is the intent of the plans and specifications for this project to require the Contractor to follow the phases and steps as enumerated therein. It is the intent of the TCP to maintain existing lanes of traffic except for the connectors to be temporary closed. However, should the Contractor find a different procedure which he wishes to pursue, a request for same should be submitted in writing to the Engineer. Changes to the traffic control plans would be allowed only with the approval of the Director of Construction and submission of complete signed and sealed TCP plans, road user cost and Primavera impact analysis. (2) Construction Sequence. The traffic control plan is divided into phases and steps. Shown below is a description of each phase. It will not be attempted herein to describe all of the steps. It is only intended to furnish a general overview of the work involved. See the plans for further details.

4-7 000--3223 07-01 PHASE 1 Step 1 (a) Install traffic control devises as shown on plans. (b) Prepare right-of-way and construct utility adjustments. (c) Construct 2-lane southbound detour for US 59 on northside of existing roadway. (d) Construct detour for connector “G” bridge. Step 2 (a) Move 2 lane of US 59 southbound traffic to newly constructed detour pavement. (b) Construct north 29’-5”of west bridge and 27’- 4” of east bridge of southbound US 59 bridges. (c) Construct first phase of connector “G” bridge.

Step 3 (a) Move 2 lanes of southbound US 59 to the north. (b) Construct 34’-8” west bridge and 36’-5” of east bridge of southbound US 59. (c) Construct remainder of connector “G” bridge. (d) Construct detours for HOV at southbound and northbound frontage road underpasses.

Step 4 (a) Move 2 lanes of northbound US 59 traffic to newly constructed north of median. (b) Construction 29’-7” west bridge and 28’-0” east bridge of northbound US 59. (c) Construct north 15’ of east HOV bridge. Step 5 (a) Move 2 lanes of US 59 northbound traffic to immediate north. (b) Construct remaining portions of US 59 bridges 31’-1” west and 38’-1” east. (c) Construct remainder of east HOV bridge. (d) Begin construction of connector “A” bridge. (e) Begin construction of connector “F” bridge after closing direct connector.

5-7 000--3223 07-01 (f) Construct southbound frontage road bridge over Tollway Connector. PHASE 2 Step 1 (a) Construct connector “B” bridge after closing direct connector. (b) Begin construction of connector “C” after closing direct connector. (c) Construct south portion of west HOV bridge. (d) Construct detour pavement for connector “E”. Step 2 (a) Construct first phase of connector “E” structure. (b) Construct remainder of connector “E” structure. PHASE 3 Step 1 (a) Begin construction of connector “D” bridge. Step 2 (a) Begin construction of connector “H” bridge. PHASE 4 Steps 1 - 3 (a) Complete construction of retaining walls NBFR-1 and NBFR-2. (b) Excavate underpasses and construct storm sewers. (c) Complete construction on remainder of retaining walls W-4, W-5, W-6. (d) Construct northbound frontage road, retaining wall SE-1, southeast frontage road, and northeast frontage road. (e) Construction detention facility DB8 and pump station PS5. (f) Remove Richmond Avenue turnabout. (g) Construct detention facility DB7 and pump station PS4. (h) Construct southbound frontage road and remainder of Tollway Connector. (i) Construct traffic signals at Westpark Drive and southbound frontage road intersection. (j) Construction striping, marking and signage.

6-7 000--3223 07-01 (k) Construct final grading, seeding and cleanup. (l) Complete traffic signal modifications at Westpark and northbound frontage road intersection. (3) Contractors Proposed Schedule. Immediately upon issuance of a work order on the project, the Contractor shall submit to the Engineer, subject to the above requirements, any provisions to the TCP which he proposed to make for the entire project. Changes will be permitted in the approved sequence only as stated in Section 3.(1) of this Special Provision. Contractor is subject to incentive/disincentive payment conditions of the contract for completion of critical bridge structures within specified time/limits. 4. Payment. Requirements necessary to perform the work in accordance with the scope and sequence herein will not be paid for directly but shall be considered incidental to the various pay items in the proposal.

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