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.
Happy 2017 from the Klingle Valley Trail Project! Recent construction activities have revolved largely around the various types of retaining walls on the trail. After completing the largest retaining wall on the project located on the east end of the trail, crews went right to work on constructing a smaller cast in place retaining wall with a stone and mortar facade located at the approximate mid-point of the trail (pictured above). Additionally, there are multiple existing walls throughout the project that will stay in place. Crews carefully replaced missing stones and mortar on these walls to enhance aesthetics and increase their service life.
Other recent construction activities deal with the management of stormwater on the trail. New manholes and corresponding concrete storm pipe has been installed on the west end of the trail to assist with carrying excess stormwater from the north side of the trail into the stream. Crews have also begun the construction of riprap ditches that run on the north side of the trail. These riprap ditches contain large stones that, in concert with a bioswale, with help to slow the velocity of excess stormwater run-off and allow it to be absorbed locally rather than overwhelming the stream.
Construction continues to progress on installation of electrical infrastructure required for over 50 new LED lighting structures. Crews have installed new manholes and are in the process of completing installation of underground conduit that will house the cables and wiring for the lights. Crews have also removed all formwork from the large gravity retaining wall on the east end of the project. It is currently being capped with existing salvaged stone and (weather dependent) is ready for the front concrete face to be stained to match the existing stone. Additionally, a smaller retaining wall has been recently completely at about the midpoint of the trail along the stream. This wall was constructed with cast-in-place concrete but will also receive a façade using the existing salvaged stone.
Construction crews continue work on the East Retaining Wall; removing formwork and backfilling the concrete wall in preparation of staining the concrete "stones" to match that of existing material in the area. The backfill activity is a timely operation. Crews install 8" layers of two different types of material: one to provide structural support and another to allow the wall to be relieved of pressures from accumulating water. Each layer is mechanical compacted and then test to ensure proper density is achieved. The operation also includes the installation of waterproofing material so that stormwater does not seep provided joints in the wall.
Construction has also begun on a much smaller retaining wall on the east side of the project along the ramp to Beach Drive. The existing retaining wall is not structural sound and therefore will be removed and replaced. The replacement retaining wall will utilize existing, salvaged stone from the project.
Construction crews continue to take advantage of the favorable weather on site and completed all concrete placements of the gravity retaining wall on the east end of the project. Additionally, all foundations for the trail's light poles are now installed in the ground (a total of 52!). Upcoming scheduled activities include installing the electrical manholes and conduits that will power the new pole's LED luminaires.
Rainy weather conditions have closed out the month of September on the project. The newly installed step-pools within the stream helped to increase the time stormwater runoff is retained on-site as well as slow the velocity of the stormwater.
Although the wet weather has slowed construction activities the last few days, progress was made this month on the new retaining wall on the east side of the project. There is one concrete placement for the wall remaining. Once completed and cured, crews will stain the wall a reddish-brown color to mimic the salvaged storm utilized elsewhere in the project. Form work was removed from some of the first sections of the wall placed, revealing the stone and masonry pattern of the newly placed wall.
Additionally, work began on the new lighting structures for the trail. Construction crews installed over half of the foundations for the new light poles. Once the foundations are all in the ground, conduit and wire will be trenched underground for future powering of the lights. The new light poles are cast iron with a Phillips MetroScape fixture and an LED lighting source.
FOR IMMEDIATE RELEASE
(Washington, DC) The District Department of Transportation(DDOT) invites you to a public meeting to present project schedule updates and information regarding the upcoming trail construction phase of the Klingle Valley Trail Project.
What: Public Meeting for the Klingle Valley Trail Project
When: Thursday, September 29, 2016
7 pm to 8:30 pm
Where: Cleveland Park Public Library
3310 Connecticut Avenue, N.W
Washington, DC 20008
Getting to the Meetings
Be sure to check out www.goDCgo.com to learn about transportation options for getting to the workshops.
Do you need assistance to participate?
If you need special accommodations, please contact Cesar Barreto at (202) 671-2829 or Cesar.Barreto@dc.gov five days in advance of the meeting. If you need language assistance services (translation or interpretation), please contact Karen Randolph at (202) 671-2620 or Karen.Randolph@dc.gov five days in advance of the meeting. These services will be provided free of charge.
The first concrete placement for the vertical section of the east retaining wall was completed on 9/01/16. Crews carefully installed formwork for the week prior to the concrete placement, including a specialty formliner that will allow the concrete wall to mimic existing stone and masonry retaining walls. Construction crews are scheduled for one concrete placement each of the next few weeks. Once all concrete is placed and given time to properly cure, the wall will be painted to match the existing and salvaged stones on the project site. The final color is still in the works using small "mock-up" walls so as to best match the color of existing stones.
The project has also begun demolishing and removing materials from the old Klingle Road off site. This work has been completed on the majority of areas just west of Connecticut Avenue and is beginning to move east of Connecticut Avenue. Public notices for this work have been sent out to the neighboring Woodley Park Towers Apartments and Kennedy-Warren Apartment Building to alert residents of potential noise from heavy construction equipment.
The majority of recent work activities revolves around preparations for a retaining wall on the east end of the project - a wall composed of more than 400 cubic yards of concrete. A procedure using special liners within the formwork and staining of the concrete will allow the new retaining wall to mimic existing structures within the area.
Construction has also progressed at the ramp to Porter Street. New sidewalk, curb and gutter, as well as a new curb ramp meeting ADA requirements have been placed along the south side of the ramp.
Stormwater structures, utilities, and walls - lots of walls - comprised the bulk of the KVT project work over the past few weeks. In its heyday, Klingle Road had hundreds and hundreds of linear feet of walls supporting the roadway, the stream channel, and the surrounding drainage structures. Some of these walls are still in great shape and will last for many years to come; others not so much. And a restored stream channel means new pipe culverts and headwalls.
The latest stormwater structure to be built on the KVT project will act as a "relief valve" Klingle Creek at its flattest point along the trail. During heavy storm and flood events, the stream will overflow the bank and collect in a flood control structure. The overflow will travel through two elliptical pipes to a smaller stormwater channel that rejoins Klingle Creek approximately 200 feet downstream. Construction of the structure, as shown in the next two slideshows, was performed in an upstream direction, a standard industry practice.
The crew started from the outfall headwall and installed pipe north towards the stream.
Once the pipe and the outfall headwall were in place, the crew installed the flood control structure. Note that all headwall stone was salvaged from original collapsed walls along Klingle Road.
The contractor also started work on a 210-foot long retaining wall on the eastern end of the trail. The new wall replaces an existing stone wall that collapsed into the creek long ago. Construction on this wall will continue for the next several weeks.
Utility work continues throughout the project. The KVT contractor recently replaced a 100+ year old segment of sanitary sewer pipe along the future trail on behalf of DC Water. Washington Gas also continued gas main replacement along the project footprint, most recently working on the final replacement segment from Klingle Road to Porter Street. Click through the slideshow below for the photos.
The Klingle Watershed Green Streets project is hosting its second design phase public meeting on Monday, June 13th from 5:30-8:30 PM. The meeting will be a walking tour of candidate sites, starting at the intersection of 36th Street and Lowell Street NW. Click here or on the images below for the full meeting flyer.
The Klingle Green Streets project team gave a initial project presentation at the KVT public meeting last November - click here for a link to the presentation.