Concrete for the new headwall at the outfall of the new storm sewer was completed this past week. Additionally, the precast base for MH-6 (one of the two new manholes) was placed. This week, construction will focus on installing the new 54-inch storm pipe from MH-6 to MH-5. This work requires carefully excavating a trench within existing tree roots, an existing Washington Gas line, and an existing 12-inch DC Water sanitary sewer; all performed under a pump-around diversion of the existing storm sewer.
Progress continues on the upgrade of the storm sewer system on the west end of the trail: this past week construction crews placed concrete for the footing of the new headwall at the mouth of Klingle Creek. A section of the existing storm pipe has been removed and a new, larger 54-inch diameter reinforced concrete pipe installed to replace it. Precast concrete sections for a new manhole (one of two to be constructed as part of this work) were delivered to site at the end of the week.
Construction crews have installed a by-pass of the existing storm sewer to allow for construction of new 54-inch diameter storm sewer. An existing concrete headwall at the mouth of Klingle Creek has been removed and work has begun on forming up the footing of the new larger headwall to accommodate the larger pipe run.
The trail was closed to the public on 9/3/19 to allow for construction crews to begin site preparations for the upcoming construction. Crews installed erosion and sediment control measures and perimeter fencing around the upper (west) area of the trail. This area will be excavated to allow for the installation of new storm drain, concrete manholes, and concrete headwall. During this work activity, this area of the trail will not be accessible.
The trail closure will begin Tuesday, September 3, 2019 and remain in place for up to 3 months. This will allow construction crews to begin the installation of a new stormwater sewer on the west side of the trail. During this time, detour signs will reroute trail users around the closure as shown below. Please continue to check back to the website for construction progress and an updated schedule.
The project team is wrapping up coordination with NPS on the proposed additional construction. Construction is expected to begin this Spring. Check back soon for more project details and schedule.
The DDOT team continues to coordinate the proposed upgrade of the stormwater sewer with the National Park Service. Construction that will require a full closure of the Klingle Valley Trail is still scheduled to begin in the near future. Please continue to visit this website as details of the construction schedule and trail closures will be available once dates are confirmed.
Construction crews are getting ready to go back to work on the Klingle Valley Trail. An existing DC Water stormwater sewer will be replaced to increase its capacity. This sewer has been the cause of some erosion issues during large rain events over the last year at the upper end of the trail. Additional erosion control measures will be implemented along the length of the trail. While upgrading the existing sewer, it will be necessary to close the trail for a portion of the construction as the excavation for the storm pipe and associated drainage structures will make the trail unsafe for users. Please check back for updates as work progresses.
On Tuesday evening, DDOT representatives gave a brief presentation to the WPCA on the recent damage to the trail and took questions and comments regarding the upcoming repair plans. Click here to view the presentation.
Join us this Saturday to open the Klingle Valley Trail. Construction crews are in the process of completing final landscaping and installing pavement markings on the trail in preparation for the opening.
It's been a busy past couple of weeks, but the project has progressed to wrapping up the final construction items. Crews are currently installing final landscaping, trail signage, and 13 park benches along the trail. Once delivered to the site trash receptacles and trailhead signs, providing an area map and history of the Klingle Valley, will be installed at each entrance.
Stay tuned for more details on a ribbon cutting ceremony, as the trail looks to open very soon!
Almost there! Last week crews completed installation of the porous asphalt trail connecting the two trailheads. The trail is comprised of 3" of base asphalt and a 1.5" of surface asphalt. Both lifts allow for stormwater to infiltrate the system and sit in a stone reservoir under the pavement.
This week will be busy with construction activities including: mill & overlay on the east end of the project along Klingle Road, installation of wood fencing on the trail, final landscaping, reconstructing an existing curb cut on the west end of the project, installing signs throughout the trail, hardscaping at both trailheads, pavement striping along the trail, and completing the reconstruction of a historic stone headwall within the Tregaron Conservancy.
Although the project is nearing completion, the trail is not yet suitable for public use. The project ask that the public refrains from entering the construction site until the opening. Check back with the website soon, as DDOT gets closer to confirming a date for the official opening of the Klingle Valley Trail.
Asphalt paving operations began last week. Field crews laid the base asphalt for approximately half of the trail from Courtland Place to the Connecticut Avenue bridge as well as the asphalt sidewalk connecting the Klingle Valley Trail to the Rock Creek Trail.
The asphalt mix used for the trail is porous, allowing stormwater to drain into a stone reservoir while removing contaminants and sediment.
While crews continue to make progress paving the trail, we ask that the public refrains from entering the construction site during all hours.
Over the past two weeks, construction crews have completed four bioretention ponds near the west trailhead, installed wiring for the new LED lighting structures, and began grading of the trail itself.
Final landscaping and paving operations are tentatively scheduled to begin next week, including an asphalt sidewalk on the east end of the project to tie Klingle Valley Trail into the Rock Creek Trail. Prior to paving operations, crews must first complete additional work requested by DC Water on the existing sanitary sewers as well as access the adjacent Tregaron Conservancy property to reconstruct a historic stone headwall.
Construction over the last couple of weeks has focused on some of the green infrastructure (GI) improvements on the project: the bioswale that runs along the north side of the trail and a biorentention ponds on the west end of the project. Both of these facilities are comprised of multiple layers of soil and porous stone to clean contaminants from stormwater and contain as much storm runoff on site as possible to prevent sediment erosion downstream.
The project's electrical subcontractor has began installing necessary wiring running between newly installed manholes and lightpoles that will power the 52 LED lights on the trail. Additionally, staining of the East Retaining Wall is nearly complete. This is a retaining wall of nearly 500 CY of cast in place concrete using formliners to mimic the surrounding stone retaining walls.
Activities for the remainder of April will focus on preparing for the final trail installation. Crews will perform final grading and placement of a porous stone base before laying down two layers of a permeable pavement. Paving is scheduled for late this month and the entire operation will extend into May.
Although last Tuesday's snowstorm slowed construction progress last week, multiple field crews are completing some key operations this week. Progress on the rehabilitation of DC Water's sanitary sewers will soon be coming to a close. Crews have been able to take advantage of off-peak daytime lane closures on Connecticut Avenue in order to limit the number of nightshifts and disturbances to the public. Click here for the latest schedule of this work. Crews have also begun installation of the bioswale which runs along the north side of the trail. The purpose of the bioswale is to collect and retain stormwater runoff and remove containments through a matrix of different materials including bioretention soil (comprised of specified percentages of loam, sand, and organic compost), a sand and gravel choker layer, porous stone, and geotextile fabric. Just adjacent to the bioswale, all 52 light poles have been installed within the last 2 weeks. The electrical subcontractor began pulling cable through manholes and into the new light poles this week, as well as installing the LED light-post tops. The type of lighting for the trail was selected due to its dark-sky friendly qualities.
This work essentially provides a brand new pipe within the existing deteriorated sewer line by a method called cured-in-place-pipe. A polyester resin liner (the yellow material shown in the photos) is pulled through the existing sewer line and is then inverted within the existing pipe and cured with steam in place. A CCTV video inspection is performed both before and after to ensure proper installation.
The rehabilitation work also includes extensive repairs to the manhole. This is performed by a spin casting method using a geopolymer mortar. A "before" and "after" photo of an existing brick manhole is shown below:
Work for the rehabilitation on the existing DC Water sanitary sewers is scheduled to begin Tuesday, February 21st. For the most current construction schedule for this work please click here. Work will begin on Klingle Rd, NW at Courtland Place during the dayshift. As this work progress onto Connecticut Avenue later in the week there will at time be a need for traffic control operations. In these cases, the work will be performed during nighttime hours. DC Water has issued a public information sheet that describes the work to be performed as well as their contacts for the rehabilitation project. Please note the sewer rehabilition work will be completed in early March not July as shown in the DC Water PIS.
Over the past month, the entire length of the site has seen the installation of plenty of riprap (large stone used to slow the velocity of water and prevent erosion). Over 6000 square feet has been placed within a channel that will run on the north side of the trail. Construction has also progressed on another storm water element: elliptical concrete pipe and corresponding manholes have been installed close to the west entrance of the trail that will carry stormwater into the stream.
Construction activities are currently on-going at the east end of the project along the ramp from Klingle Road to Beach Drive. In order to allow for an asphalt sidewalk to connect the Klingle Valley Trail to the Rock Creek Trail, an existing retaining wall has been removed and will be replaced with a stone masonry wall that will match the stone work used for the adjacent bridge at Porter Street.
Upcoming scheduled activities are focused on the rehabilitation of existing DC Water sanitary sewers within the project. This work will be performed by a method called 'cured in placed pipe' (CIPP) which allows a new liner to be installed within the existing pipe and does not require any significant amount of excavation to expose the pipe. The schedule for this work is being closely coordinated with DDOT and DC Water but will require some traffic control along Connecticut Avenue during off-peak hours.