Bulletins (monthly)

An I-25 Trinidad construction bulletin is released monthly and details the general schedule for the upcoming month. Monthly schedules are preliminary and subject to change dependent on weather or other factors:

August and September 2011 Construction Bulletin The following are construction activities expected for August and September 2011: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Schedule Update: At this time CDOT anticipates completion of all project tasks by early Fall 2011. All lanes of I-25 were opened to traffic in August. Work in Progress: The contractor will work on project cleanup and final punch list items. Work will continue to complete structural concrete paint/staining on piers and barriers. The contractor will work on finishing the landscaping at various locations around the project area.

July 2011 Construction Bulletin The following are construction activities expected for July 2011: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Schedule Update: At this time CDOT anticipates completion of all project tasks by early Fall 2011. Work in Progress: Construction continues on parking lots under the viaducts. (Read more about the Benefits of the SCCOG Transit Center under viaduct parking lots on Benefits to Trinidad.) Workers will be placing sidewalks under the viaducts. The contractor continues water quality pond grading and landscaping. (Read more about the water quality pond under Design Features on the Design Page.) The contractor begins dry stream grading and landscaping under the viaducts (i.e. part of drainage system for the viaduct and at-grade drainage under the viaducts). Workers continue concrete finish work in preparation for ongoing staining the structures. Miscellaneous grading throughout the project area continues. The contractor continues installation of the fence along the Purgatoire River Trail.

June 2011 Construction Bulletin The following are construction activities expected for June 2011: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Schedule Update: CDOT hopes to wrap up the project by Mid-Summer 2011. Overall Project: The contractor is working on project cleanup and the final punch list items for the project. Construction will begin on the parking lots under the viaducts. The contractor will be finishing the concrete barrier along I-25. As barrier is completed final adjustments to the barrier mounted LED lighting along I-25 will made. (Read more about LED Highway Guidance Lighting under Design Features on the Design Page.) Work will proceed on final project landscaping.

April and May 2011 Construction Bulletin The following are construction activities expected for April and May 2011: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement All Bridges: The contractor will continue painting bridge substructures and girders with a sealing concrete stain as weather permits. Work will continue setting the stone facing on bridge piers as weather permits. Project Overall: The contractor plans on taking out the cross-over detours and opening up full laneage on both NB and SB I-25 in the next month. The contractor is working on project cleanup and the final punch list items for the project. Final grading of ramp side slopes and gore areas throughout the project area and final grading in other areas in preparation for final landscaping will continue. Progress will be seen on the under viaduct parking areas for the Amtrak Station and future multi-modal center. (Read more about the Benefits of the SCCOG Transit Center under viaduct parking lots on Benefits to Trinidad.)

March 2011 Construction Bulletin The following are construction activities expected for March 2011: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement All Bridges: Work will continue to close the remaining gaps in various traffic barriers as weather permits. The contractor will continue painting bridge substructures and girders with sealing concrete stain as weather permits. Work will continue setting the stone facing on bridge piers as weather permits. Project Overall: The contractor will begin working on project cleanup and the final punch list items for the project. The contractor will continue final grading of ramp side slopes and gore areas throughout the project area. The contractor will begin final grading in other areas in preparation for final landscaping. The contractor will begin work on the under viaduct parking areas for the Amtrak Station and future multi-modal center. (Read more about the Benefits of the SCCOG Transit Center under viaduct parking lots on Benefits to Trinidad.)

January and February 2011 Construction Bulletin The following are construction activities expected for January and February 2011: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Viaduct: Decking and barriers will be completed on the Southbound Viaduct and the Southbound traffic lane will be moved to the Southbound Viaduct. The Northbound Viaduct will be reconfigured to one lane of Northbound traffic. This will proceed as weather permits. All Bridges: Work will continue to close the remaining gaps in various traffic barriers as weather permits. The contractor will continue painting bridge substructures and girders with sealing concrete stain as weather permits. Work will continue setting the stone facing on bridge piers as weather permits. Project Overall: The contractor will continue final grading throughout the project area as weather permits.

October 2010 Construction Bulletin The following are construction activities expected for October 2010: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Viaduct: The last four bridge girders over College Street will be installed this month. The contractor continues to pour concrete decking. The last portion of deck should be in place this month. All Bridges: With the concrete decks completed the contractor will begin to place the type 7 concrete bridge rails. The contractor will be painting bridge substructures and girders with sealing concrete stain throughout October and November. Project Overall: The bricks will be installed in the intersection of Pine Street and Arizona Street. The contractor will begin final grading throughout the project area.

September 2010 Construction Bulletin The following are construction activities expected for September 2010: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Viaduct: All but four girders over College Street have been erected. These girders are now scheduled to be installed in October. Approximately one half of the deck has been poured. The contractor is currently working on the remaining half, which is expected to be completed by mid to late October. Paving: Paving of the Southbound Lanes has begun and is expected to continue for the next couple months. Structural Concrete Coating: Specific paint colors have been approved and the contractor has begun painting the retaining walls and bridges.

July and August 2010 Construction Bulletin The following are construction activities expected for August 2010: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Viaduct: All but four girders over College Street have been erected. These girders are expected to be installed in August. A portion of the deck has been poured and the remaining portions are expected to be completed between now and mid October. Purgatoire River Bridges: The Purgatoire River Bridges have been completed except for bridge rail. Main Street Bridge: The Main Street Bridge has been completed. Retaining Walls: All Retaining Walls have been completed. Landscaping: Landscaping continues along the Purgatoire River. The water quality pond from Phase II NB has been shaped and is waiting for final landscaping. Parking Lots: Curb and Gutter will be installed in the next two months. Structural Concrete Coating: The contractor is currently installing test panels of proposed paint colors for a final decision on the bridge and retaining wall paint colors.

June 2010 Construction Bulletin The following are construction activities expected for June: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Purgatoire River Bridges: Deck panel installation work continues and will be completed soon. The cast-in-place bridge deck paving will be poured by the end of June. SB Viaduct: Deck panel installation work continues and will be completed by the end of June. The cast-in-place bridge deck paving will be poured starting at the end of June and should be complete around the end of July. Retaining Walls: All project retaining walls are nearly complete. One last wall near Main Street will be completed in the next two months. Landscaping: Landscape work continues under the Purgatoire River Bridges. Storm Drains: The storm sewer installation across Nevada Avenue near the viaducts has been completed. Parking Lots: Construction of parking lots will begin after the viaduct deck is complete.

May 2010 Construction Bulletin The following are construction activities expected for May: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Linden Street Bridges: Repair of the decks, guardrail installation and waterproofing membrane has been completed. Bridge deck paving will be completed in the next month. SB I-25 over Main Street: Work continues on installing the bridge rail. SB I-25 over the Purgatoire River: The contractor will begin landscaping to develop this site as the Purgatoire River Park, which will feature picnic tables and benches. See more: Progress Photos All girders are in place. Work has started on installing the precast concrete bridge deck panels. The Contractor expects to install the cast-in-place portion of the deck by the end of May. SB Viaduct: Girder installation will be completed by the end of May. The Contractor is currently working on installation of the girders over the railroad. Precast concrete deck panel construction will continue through May and June. Retaining Walls: Work continues on retaining walls throughout the project area. Landscaping: Landscape work is continuing in the Purgatoire River Park. Parking Lot: Work on the parking lot, located under the NB & SB viaducts will commence in July or August.

March 2010 Construction Bulletin The following are construction activities expected for March: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Southbound I-25 over Main Street Bridge: Installation of steel deck panels is nearing completion. Crews will soon begin installing deck reinforcing steel and electrical conduit. Cast-in-place concrete bridge deck should be placed by the end of the month. Southbound I-25 and Main Street off-ramp Bridges over the Purgatoire River: Abutments have been completed. 8 of 12 Girders have been placed. The remaining 4 girders will be placed by the middle of the month. Placement of pre-cast concrete deck panels will follow the completion of girder erection. Cranes set a segment of one of the variable depth girders that will span the BNSF Railroad. See more: Progress Photos Southbound I-25 Viaduct and Commercial on-ramp Bridges: Abutments have been completed. 34 of 52 Girders have been erected and placed. Installation of pre-cast concrete deck panels continues. The remaining 18 girders, including the drop in section over the BNSF Railroad tracks, will be completed by the end of the month. Installation of post tensioning stands and stressing will soon follow the girder erection. Earthwork and other construction: Crews continue installing new storm drain sewers. Excavation of the water quality pond under the northbound viaduct structure has began. Clearing and grubbing for the new Purgatoire Park has been completed, irrigation line installation, planting and seeding will be performed during the next couple of months. Construction of the MSE wall continues throughout the project. Contractors on site: Lawrence Construction Co Felix Chavez and Son Construction Purgatoire Valley Construction Total Terrain Landscaping Bustos Contracting Redwing Electric Slaton Brothers

January and February 2010 Construction Bulletin The following are construction activities expected for January and February: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Demolition: Demolition of the old southbound structures has been completed. Southbound I-25 bridge over Main Street: Concrete at Abutments 1 and 2 has been placed. Erection of the girders is complete. Upper and lower Mechanically Stabilized Earth Landscape Walls in front of each abutment are complete. Crews will soon begin placing galvanized deck panels. Southbound I-25 Main Street off-ramp over Purgatoire River: Steel H Piles have been driven at each of the abutment locations. Reinforcing steel and concrete has been placed for the bridge pier columns. Installation of pre-cast concrete deck panels on the SB I-25 viaduct. Placement of concrete box girders on the SB I-25 viaduct over Main Street. See more: Progress Photos Crews will soon begin working on forms, reinforcing steel and concrete for the abutments. Southbound I-25 over Purgatoire River: Steel H Piles have been driven at each of the abutment locations. Reinforcing steel and concrete has been placed for the bridge pier columns. Crews will soon begin working on forms, reinforcing steel and concrete for the abutments. Southbound I-25 Commercial on-ramp: The driving of Steel H Piles is complete for this structure. Pier footings have been completed. Pier columns will be completed in the next few weeks. Upcoming work will include abutment construction and girder erection. Southbound I-25 Viaduct: The driving of Steel H Piles is complete for this structure. Pier footings have been completed. Only one Pier column remains to be completed. Girders have been erected from Pier 9 to Abutment 17. Erection of Pre-cast concrete deck panels has begun. Construction of temporary false work footings and columns is progressing. Earthwork and Other construction: Excavation and backfill of bridge footings and pier columns continues. Excavation for Abutment 13 of the SB Commercial Street on-ramp has begun. Storm drainage line installation continues. Construction of Mechanically Stabilized Earth Walls continues. Temporary and permanent stabilization and landscape work has resumed. ARRA Stimulus Project work: Repair of the northbound I-25 bridge deck over Linden Ave continues. Contractors on site: Lawrence Construction Company - Pile Crew, Demolition and Structure Crews JD Steel - Steel reinforcement installation Purgatoire Valley Construction - Bridge deck repair Felix Chavez and Son Construction - Excavation, embankment, storm drains Slaton Brothers Construction - MSE Wall Construction Bustos Contracting - Traffic Control Total Terrain - Temporary/permanent stabilization and Landscaping

December 2009 Construction Bulletin The following are construction activities expected for December: Progress Map - Phase II SB Construction Construction moved to SB lanes in September 2009. Southbound reconstruction, from Goddard Avenue to Van Buren Street, will be similar to the work on the northbound segment. Progress Map - click to view enlargement Demolition: Demolition of the southbound structures is nearly complete. Final demolition and cleanup should be completed by the end of the second week of December. Southbound I-25 bridge over Main Street: Caissons have been completed for Abutments 1 and 2. Concrete has been placed at Abutment 2 and the adjoining wing walls. Construction of Mechanically Stabilized Earth Landscape Walls in front of the abutments is progressing. Erection of the first girders for the southbound portion of the project. Demolition of the southbound viaduct bridge piers that once spanned Pine Street. See more: Progress Photos Southbound I-25 Main Street off-ramp over Purgatoire River: Caissons have been completed for Piers 2 and 3. The column forms are being built, concrete is scheduled to be placed in the next couple of weeks for Piers 2 and 3. Steel H Piles will be driven in the next couple of weeks for the abutment foundations. Southbound I-25 over Purgatoire River: Caisson construction is scheduled to begin the second week of December. Steel H Piles will be driven in the next couple of weeks for the abutment foundations. Southbound I-25 Commercial Street on-ramp: The driving of Steel H Piles at abutment and pier locations is progressing. Placement of reinforcing steel and concrete for pier footings is also progressing. 6 of 8 Piers have been completed (H Pile, Footings, Reinforcing Steel and Concrete). Pile driving, reinforcing steel and concrete placement will continue until construction of all footings and piers is complete. Southbound I-25 Viaduct: Lower portion of Abutment 17 has been completed (H Piles, Reinforcing Steel and Concrete). 12 of 15 Piers have been completed (H Piles, Footings, Reinforcing Steel and Concrete). 2 spans of girders have been erected. Next week, four more spans of girders should be erected, with the prep work for pre-cast deck panels to immediately follow. Work on the end anchorages for the variable depth girders continues. During the next couple of weeks the contractor will be constructing the falsework footings and columns. Earthwork and Misc. construction: Excavation and backfilling operations continue for all structures (footings, abutments, caissons, etc.). Storm drainage lines continue to be installed. ARRA Stimulus Project work: Mechanically Stabilized Earth wall for the bike trail is near completion. Repair of the Northbound I-25 bridge deck over Linden Ave has begun. The bottom mats of Hot Mix Asphalt have been placed leading up to the I-25 bridge over Linden Ave. Contractors on site: Lawrence Construction Company - Pile Crew, Demolition and Structure Crews JD Steel - Steel reinforcement installation Purgatoire Valley Construction - Bridge deck repair Felix Chavez and Son Construction - Excavation, embankment, storm drains Slaton Brothers Construction - MSE Wall Construction A&S Construction - HMA Paving Bustos Contracting - Traffic Control LMS Drilling - Caissons

August through November 2009 Construction Bulletin The following are construction activities expected for August through November: Northbound: Bridges - Continuing and new work Approach Slab reinforcing steel and concrete placement Installation of water proofing membrane Installation of LED lights Upcoming - Hot Mix Asphalt Paving of bridge decks Roadway Installation of light pole bases, lights poles and luminaries New storm drainage at the street level Portland Cement Concrete Paving tie ins from roadway to bridges Installation of Type 7 Concrete Guard Rail Installation of Type 3 Guard Rail, End Sections and Impact Attenuator Installation of overhead sign bridge Upcoming - Installation of new Signing and striping Pier construction is well underway between the nearly finished northbound viaduct and the existing southbound viaduct. Forms rise from the ground for the first pier of the new southbound viaduct. See more: Progress Photos Southbound: Bridges - New work Installation of Steel H Piles Reinforcing steel and concrete placement for bridge pier footings Reinforcing steel and concrete placement for bridge piers Excavation and backfilling for bridge pier footings Roadway Crossover construction for I-25 mainline Placing of embankment material for new off-ramp Stimulus Package: Trail Wall Installation of the signs identifying the Stimulus Project Structure excavation Placement of embankment material Placement of structural backfill Contractors on site or soon to be on site performing work: Lawrence Construction Felix Chavez and Son Construction Triple G Construction JD Steel Redwing Electric A-1 Barricade Bustos Contracting Adarand Constructors Castle Rock Construction LMS Drilling Brundage Bone Concrete Pumping A&S Construction ABCO Contracting Slaton Brothers Total Terrain Steelock Fence Kolbe Striping

July 2009 Construction Bulletin The following are construction activities expected for July: Completed Work - Northbound: All bridge girders for the northbound portion have been erected All bridge decks for the northbound portion of the Project have been completed Air testing the post tensioning ducts prior to grouting. Bridge expansion device bladder installation. See more: Progress Photos Mechanically stabilized earth walls have been finished for the northbound portion of the Project Post tensioning and grouting of ducts for the viaduct bridge are finished On-going Work - Northbound: Approach and sleeper slabs for the northbound bridges are being completed Type 7 guardrail installation Type 7 bridge rail installation Bridge deck drains installations Electrical conduit installation in the Type 7 Overhead sign corbel on the northbound viaduct is being constructed Installation of seeding and mulching, erosion blankets, etc. Installation of temporary erosion control BMP's On-going Work - Southbound: Clearing and grubbing for the trail walls has begun Planned Work - Northbound: Installation of chain link fence on the viaduct bridge over the rail road tracks Installation of water proofing membrane on northbound bridges Hot mix asphalt paving on all northbound bridges Complete Portland Concrete cement paving on NB Mainline I-25 and NB on and off-ramps Install remaining bridge expansion devices Overhead sign erection Planned Work - Southbound: Excavatation for bridge pier footings to begin Driving of H-Piles for bridge piers to begin Placement for reinforcing steel and concrete for bridge piers to begin

May and June 2009 Construction Bulletin The following are construction activities expected for May and June: Recently Completed Work: NB Viaduct Unit 1 • Deck reinforcing steel placement. Green corrosion resisting epoxy coated reinforcing steel in place for the deck pour. Workers rake and vibrate fresh concrete into the reinforcing steel mat to eliminate air pockets. See more: Progress Photos • Cast-in-place concrete deck. • Removal of temporary shoring   piers and foundations. • Placement of final post tensioning   strands. NB Main On-ramp over Purgatoire River • Installation of bridge expansion   devices • Placement of sleeper and   approach slab reinforcement and   concrete NB I-25 over Purgatoire River • Installation of bridge expansion   devices • Placement of sleeper and   approach slab reinforcement and   concrete NB I-25 MSE Wall 1 • Placement of wall cap/moment   slab steel reinforcement and   concrete NB throughout Project • Temporary and permanent seeding   and mulching • Wiring for lighting installed (not   complete) Continuing / Upcoming Work: NB I-25 over Main Street • Installation of expansion joints. • Placement of sleeper and approach slab reinforcement and concrete. NB Viaduct • Install bridge expansion device at Pier 10. • Preparation and erection of the last four girders for the northbound portion of the   project. • Form and place bridge deck drains. • Final post tensioning and grouting of the post tensioning ducts. NB I-25 MSE Walls 1 & 2 • Placement of reinforcing steel and moment slab concrete. NB throughout Project • Installation of storm sewer lines. • Miscellaneous earthwork. • Seeding and mulching. SB Trail Wall Location • Begin clearing and grubbing operations. • Installation of erosion control devices. NB all bridges • Placement of cast-in-place Type 7 bridge/guard rail. Contractors recently on site performing work: Lawrence Construction Company Rocky Mountain Reinforcement Redwing Electric Leone Redi-Mix Concrete Schwager Davis Inc. Bustos Contracing Inc. Brundage Bone Concrete Pumping Total Terrain Inc.

April 2009 Construction Bulletin The following are construction activities expected for April: Roadway: Castle Rock Construction continues to place 12" Portland Cement Concrete Paving. Slaton Brothers has completed the majority of MSE Walls for the northbound portion of the project. Many of Trinidad's brick paved streets were declared protected historic components of the Corazon de Trinidad Historic District in 1977 Closure pours are complete (dark vertical bands) and the girders tensioned. Cranes again prepare to lift stiff backs. See more: Progress Photos Adarand Construction has installed Type 3 Guardrail on the south end of the project. Lawrence Construction continues to work ahead of the pavers installing Class 6 Aggregate Base Course and behind them shouldering the newly paved roadway. Redwing Electric continues to install light standard foundations and wiring. They will soon begin placing the new light standards along northbound I-25. Lawrence Construction has begun to place roadway embankment for the southbound portion of the project at the location of the old Exit 14 at State Highway 12. Structures: Redwing Electric has begun the installation of the LED Lighting on the Type 7 Bridge Rail. Lawrence Construction continues to install pre-cast concrete deck panels and form overhangs in preparation of reinforcing steel placement for cast-in-place concrete deck. They should begin deck placements by the end of April. Lawrence Construction will begin removing the temporary concrete shoring towers for the viaduct structure in the next couple of weeks. Closure pours and stressing of this phase of tendons is complete, the temporary wood shoring has been removed, sand jacks have been blown. Lawrence Construction continues to construct the sleeper slabs, approach slabs and expansion devices for the bridges on the project. Other Activities: Lawrence Construction will continue to place new storm sewers throughout the project. Total Terrain will be on site in the next couple of weeks to continue temporary stabilization of the disturbed areas and to place permanent seeding and mulching in the areas that are complete.

February/March 2009 Construction Bulletin The following are construction activities expected for February: Recently Completed Work: Concrete pavement testing Many of Trinidad's brick paved streets were declared protected historic components of the Corazon de Trinidad Historic District in 1977 See more: Progress Photos Brick paving on Commercial Street has been completed. A new retaining wall and riprap were installed on the north side of Commercial Street, east of I-25. Concrete paving on I-25 at the north and south project limits has been completed. On-Going Work: Construction continues on the northbound I-25 viaduct. This work includes pier diaphragm placements, girder closure placements, erection of pre-cast concrete deck panels, thickened bottom flanges, approach slabs and expansion devices. Planned Work in February/March of 2009: Lawrence Construction will begin finishing the I-25 shoulders on I-25 adjacent to the concrete paving. Work will resume on street level storm sewer installation. Future Work in Spring of 2009: Finish northbound I-25 concrete paving. Complete retaining wall construction for northbound I-25.

December 2008/January 2009 Construction Bulletin The following are construction activities expected for December and January: See more: Progress Photos Continuing work: Girder erection continues for unit one of the north bound viaduct bridge this week. The final segments are tentatively scheduled to be installed sometime in late January 2009. 12" Portland Cement Concrete Paving continues on each end of the project as well as the roadway portion between the river and viaduct bridges. The installation of brick pavers on Commercial Street should be completed by the end of this week. Commercial Street and the Commercial Street on-ramp to north bound I-25 will be reopened when the installation is complete. New work: Post tensioning of the viaduct bridge will begin this week. Replacement of the wood box culvert at the intersection of SH 12 and State Street should be started and completed this week. Planned work: Installation of pre-cast concrete deck panels on the viaduct bridge. Installation of expansion devices and approach slabs on all bridges. Work may resume in the next few months on the MSE walls and cast-in-place Type 7 bridge rail.

November/December 2008 Construction Bulletin The following are construction activities expected for November and December of 2008: See more: Progress Photos Variable depth girders will be installed at the south end of the viaduct. Castle Rock Construction will set up a mobile concrete batch plant near College Street and Nevada Avenue. Soon after they will start concrete paving of mainline I-25 between Van Buren Street and Commercial Street, the Main Street northbound off-ramp and the Commercial Street northbound off-ramp. Triple G Construction will construct bridge barrier on the viaduct and the Commercial Street northbound off-ramp. Slaton Brothers will install MSE Retaining Walls along northbound I-25 south of Main Street and between Main Street and the Purgatoire River. Duran Brick will be installing bricks in Commercial Street between the railroad tracks and Hadad Street. Total Terrain will be seeding several areas around the bridges and the MSE walls.

October 2008 Construction Bulletin Look for the following construction activities during the month of October 2008: See more: Progress Photos On going work: Storm sewer installation for roadway and street level. MSE wall installation including both concrete panel faced and temporary wire faced walls. Construction of type 7 bridge rail and guard rail on bridges and roadway. Splicing of viaduct bridge girders. Erection of girders, including the section over the BNSF Railroad. Concrete paving on the NB I-25 Main Street off-ramp. Earthwork operations, including excavation for MSE walls and placement of Class 6 ABC on I-25 mainline roadway in preparation of concrete paving. New work: Mainline I-25 Portland Cement Concrete Paving. Placement of electrical conduit on bridges to facilitate installation of LED lighting for the roadway.

September 2008 Construction Bulletin Planned work during September: See more: Progress Photos Construction of temporary wire facing MSE walls on NB I-25 between the Main Street and Purgatoire River bridges, and along NB I-25 between river bridges and northbound viaduct bridge Continuing work on the panel facing MSE walls at various locations throughout the project. Backfill of at the Purgatoire River Bridge abutments. Concrete deck placement for Unit 2 of the Northbound Viaduct. Construction of shoring tower footings and columns for Unit 1 of the Northbound Viaduct, to facilitate the girder erection. Girder erection for Unit 1 of the Northbound Viaduct. Street level storm sewer installation. Grading of road base in preparation of Portland Cement Concrete Pavement at the south and north ends of the project on NB I-25. Portland Cement Concrete Paving on the northbound off-ramps at Main Street and Commercial Street. Installation of Type 7 bridge rail and electrical conduit for the LED lighting. As required pot hole patching operations on I-25 throughout the project. Delays of 10 to 15 minutes can be expected during these operations. Variable message signs will have a message notifying the traveling public of these delays.

August 2008 Construction Bulletin The following work has been completed: See more: Progress Photos Three spans of the I-25 NB to Commercial Street off-ramp concrete bridge deck. The Main Street to NB I-25 on-ramp bridge deck. Pre-cast bridge deck panel installation for the NB I-25 bridge over the Purgatoire River plus Units 2 and 4 of the NB I-25 viaduct. Commercial Street concrete paving. (Brick pavers will be installed at a later date.) Sanitary sewer and water line installation. Look for the following work in August and early September: Placement of the cast-in-place concrete portion of the NB I-25 over the Purgatoire River bridge plus Units 2 and 4 of the NB I-25 viaduct. Installation of temporary shoring towers to facilitate the placement of pre-cast concrete girders on Unit 1 of the NB I-25 viaduct. (College Street will be closed between Nevada and State Streets.) Placement of pre-cast concrete girders on Unit 1 of the NB I-25 viaduct. Bridge rail slip forming on the new bridges. Continuing work on the concrete paving and curb and gutter installation on the Main Street interchange ramps. Concrete paving of portions of NB I-25 mainline Continuing construction of MSE retaining walls at various project locations.

June/July 2008 Construction Bulletin The following construction activities have been completed: Concrete paving on Commercial Street, the NB Commercial Street on-ramp and the NB Main Street on-ramp. Girder placement on the Purgatoire River bridges. Look for the following construction activities during the month of June/July 2008: Continuing work: See more: Progress Photos Girder placement and concrete deck panel installation on the NB viaduct structure. Concrete deck panel installation on the Purgatoire River bridges. MSE wall construction and traffic barrier installation along I-25 ramps. New work: Installing curb and gutter and sidewalks along Commercial Street. Paving the Main Street off-ramp.

May 2008 Construction Bulletin The following construction activities have been completed: All sub-structures for the Viaduct, Purgatoire River and ramp bridges have been completed Main Street bridge deck has been placed Commercial Street on-ramp concrete paving partially complete Stabilization of slopes (VanBuren, College/Purgatoire) by seeding, mulching and erosion blankets Look for the following construction activities during the month of May 2008: Continuing work: Continued work on the sanitary sewer and water lines in Commercial and Pine streets Installation of storm sewer lines several locations on the project Placement and grouting of pre-cast concrete deck panels on Viaduct, Commercial Street off-ramp and Purgatoire River bridges MSE wall caps and moment slabs New work: Portland Cement Concrete Paving on Commercial and Main Street ramps and intersections Curb and gutter, raised medians at Cedar and Nevada intersection and SH 12 and State Street intersection Type 7 Bridge Rail slip forming on Commercial Street on-ramp

February 2008 Construction Bulletin Look for the following construction activities during the month of February 2008: NB Viaduct pier construction near University Street and Nevada Avenue. Girder erection and deck panel installation at the Purgatoire River bridges and Main Street Bridge. Construction of retaining walls along I-25 between Main Street and University Street.

November 2007 Construction Bulletin Look for the following construction activities through the end of November 2007: Girder erection and additional pier construction on the northbound viaduct. Start up of construction on the proposed bridges over the Purgatoire River. Continuing work on the bridge at Main Street. Utility installation on Hadad and Commercial Street. Continuing retaining wall construction.

September/October 2007 Construction Bulletin CDOT’s Contractor continues to make great progress on the reconstruction of I-25 NB through the City of Trinidad. Following is the expected activities through the end of October 2007: Miscellaneous utility replacements/installations. Clean up of the viaduct removal. Finishing the Main Street Bridge substructure and setting of the bridge girders. Installing the Main Street landscape walls. Construction and grading of the water quality pond near the location of the old Pizza Hut. Continuing construction on the I-25 retaining walls.

July 2007 Construction Bulletin As summer continues with its warm weather, reconstruction of I-25 through the City of Trinidad is in full swing. Multiple construction activities are going on concurrently. Following are the expected construction activities through the end of July: All traffic will be detoured to the Southbound Lanes on Monday, July 16th. Demolition of the Pizza Hut and Amoco Buildings is scheduled for July 16th through 18th. Demolition of the existing northbound viaduct will start on July 19 and continue through the end of the month or into the first part of August. At the I-25/Main Street Interchange, the Contractor will install a section of the new storm drain system and build the roadway fill for the northbound off-ramp. Several viaduct pier columns and footings will be constructed. Pile driving will continue for the viaduct piers and abutments. Continuing construction of the MSE retaining walls at the I-25/Commercial Street interchange ramps. Watch for temporary local road closures during the viaduct demolition.

June 2007 Construction Bulletin Reconstruction of I-25 through the City of Trinidad is well underway. As the summer season approaches expect the work effort to increase. In the past few months CDOT’s Contractor has detoured portions of northbound I-25 onto the southbound lanes; demolished the existing northbound I-25 Main Street Bridge; constructed portions of the storm drain system; began repairs to the existing southbound viaduct bridge deck; and started reconstruction of northbound I-25 on the south end of the project. During the next four to six weeks look for CDOT’s Contractor to work on/complete the following: Complete the deck repairs of the existing southbound I-25 viaduct; this is in preparation for two-way traffic on the viaduct. Start/complete utility work under the BNSF Railroad tracks to extend sanitary and storm sewer lines. Continue the reconstruction of northbound I-25 between Van Buren and Main Street. Construct the I-25 NB over Main Street Bridge abutments and associated landscape walls. Start construction of retaining walls at the Main Street I-25 NB off-ramp, and Commercial Street I-25 NB on-ramp. Start construction of the new northbound viaduct foundations. At this time no local road detours or closures are planned in the next four weeks, however there will be continued lane closures on the southbound lanes of I-25 for completion of the viaduct deck repairs.