Thursday - July 10, 2014

West Linn Pipeline Construction Update: Horizontal Directional Drilling site (end of Mapleton Dr.)

A drill rig cleans and augurs out material inside the newly installed casing

A drill rig cleans and augurs out material inside the newly installed casing

Pipe casing installation progressing well

The pipe casing work started last week and is progressing well at the HDD site, just north of Mary S. Young Park. The 60-inch steel casing has been installed to about 160 feet, and is almost complete. Thank you to neighbors for your patience during this noisy activity. Crews are now determining if they have reached stable, solid ground (bedrock) before drilling the pilot hole under the river. Additional casing lengths may need to be installed using the pressurized hammer, depending on ground conditions.

Over the next few weeks, drilling equipment, a solids separation tank and materials will arrive at the site. Equipment will be set up to prepare for drilling the first pilot hole under the river, which will begin once the casing installation is complete. The pressurized hammer will be replaced with a drill rig, and a hole will be drilled through rock under the river.

During the pipe casing hammering (known as pipe ramming), it will be very noisy for approximately 1 - 3 hour periods during work hours, depending on conditions. Work hours are 7 a.m. - 7 p.m. Monday to Friday, and Saturdays from 9 a.m. - 5 p.m. Depending on locations and terrain, neighbors may hear noise during the casing hammering. The contractor will aim to start the noisiest work after 9 a.m. Following each hammering period, there will be a few hours of cleaning and welding, which is not as noisy. The hammering schedule varies depending on progress and conditions – it could take place a few times a day, or occur every 1-2 days. Immediate neighbors to the site may experience some vibration during the casing installation.

Meldrum Bar Park – casing installation continues

Casing installation resumed today at Meldrum Bar Park. Over the last few weeks, crews ran into many cobbles and boulders installing the first 200 feet of casing. Due to friction, they have now shifted to installing a smaller casing. Neighbors in West Linn opposite Meldrum Bar Park may hear noise during this activity. Due to tough ground conditions at the site, this work is expected to take another two weeks to complete. Work hours in Gladstone for the HDD are 7 a.m. - 6 p.m., Monday to Friday and some Saturdays. Please visit the website for more information on construction activities in Gladstone.

Neighborhood Construction Meetings at the Burgerville in West Linn

The 20th bi-monthly neighborhood construction update meeting was held on Tuesday, July 1, at Burgerville in West Linn. All meeting materials are posted on the project website on the “past public meetings” page, including summaries, agendas and updates. A link to the July 1 summary, including discussion and action items can be found here.

The next neighborhood construction meeting will be held on July 15, at 6 p.m. in the downstairs restaurant area at Burgerville, 18350 Willamette Drive in West Linn. Meetings are held at 7:30 a.m. on the first Tuesday of the month and 6 p.m. on the third Tuesday of the month. Meetings include updates on the HDD pipeline work and water treatment plant work occurring in West Linn.

For more information, drop-in to a bi-monthly meeting at Burgerville, visit the work underway map, email lotwater@ci.oswego.or.us or call 503-697-6502.