Friday, August 12, 2005
In the trenches: School wastewater pipeline project underway
After starting construction just three weeks ago, trenches for the school's new wastewater treatment facility are dug and pipes have been installed from the school down to Bedford Road/Route 225. Trenching along Bedford Road in front of Green Cemetery continued this week by D'Amico Construction, with the pipeline to continue up the side of the Banta-Davis driveway to the site of the wastewater plant. The project's timing, while school is out for the summer, helped to minimize disruption while Spalding Field and Church Street were being dug.
The section of Church Street dug for the pipe is now paved with temporary asphalt to allow traffic. The permanent pavement will be laid down next year after the soil has settled and when the project is completed.
So far, construction is going well according to site engineer Robert Trzepacz of Hoyle, Tanner & Associates, designers of the system. Trzepacz is on-site in Carlisle every day. Excavation of the Spalding playing fields on Church Street is now complete. Last week new grass sod was laid down on the field over the soil dug up for the pipeline. Sod was specified in the bid because grass seed would not fill in quickly enough for the fall sports season. It should take two to three weeks for the new sod to take root while it is watered daily by a sprinkler system in the hot weather, said School Business Manager Steve Moore. The field was restored for the Recreation Commission by Dan Moseley. The new grass is expected to be ready to handle the fall recreational soccer season that begins in mid-September. The construction bid also specified that trenching on Spalding Field be completed by September 1, so it would not conflict with fall sports.
Various soil conditions have turned up underground, but no ledge has been encountered along the pipe path so far, a relief to engineers and the School Building Committee who factored the possibility of removing ledge into the project's timeline and budget. However, the hill between the school gymnasium and Spalding Field was full of boulders pushed there when the school's Corey building was excavated. More fill was needed on the hill because there was not a lot of soil to replace.
The soil on Spalding Field and along Church Street was soggy peat and clay because of Pages Brook and the wetland area that surrounds it. Conservation Administrator Sylvia Willard has visited the construction site to monitor the project in the wetland area on Church Street. During excavations an existing metal conduit pipe running under Church Street at Pages Brook was found to be rotted out and full of holes. This pipe was replaced by the Carlisle Department of Public Works, said Trzepacz.
Two monitoring wells have also been drilled at Banta-Davis to provide water samples to ensure water quality is not affected by the wastewater system, once it is operating.
At Banta-Davis, the wastewater plant site will be about halfway up the driveway on the right, an area that is now cleared of trees. The building for the treatment system will be about 40 x 40 square feet in size. An adjacent clearing to the right is reserved for future town tennis courts. A construction trailer at Banta-Davis is a temporary office for the site engineer.
Trzepacz said HTA engineering and D'Amico construction appreciate the cooperation of the Carlisle DPW, the Recreation Commission, and other town boards who have assisted in keeping the project running smoothly thus far.
© 2005 The