Water Street Sewer Interceptor Replacement Project

Construction activities for this week consisted of the following:

• Northern finished prepping the subgrade for pavement restoration.
• Pavement restoration, sidewalk restoration, and line striping along Water Street from the rotary towards Chilton Street was completed on Wednesday, June 28.
• Northern's on site testing company (Thielsch Engineering) performed compaction testing along Water Street.
• Northern continued demobilization of equipment and materials from the job site, as well as performed general site cleanup around the work zone and in the laydown area in the Memorial Hall parking lot. All equipment and materials will be removed from the job site by end of day Friday, June 30.
• Traffic on Water Street was restored to two lanes of traffic following pavement restoration. 
• Construction signage and message boards for the project will be removed this week.
• Erosion controls will be removed as part of site cleanup this week.
• Businesses on Water Street remained open to the public during construction activities. 

No construction activities are planned for the summer season. Northern anticipates to resume work on site during the fall of 2023 after Thanksgiving.

Construction activities for this week consisted of the following:

• Northern's well grouting company (L. Guerini) was on site and worked on decommissioning wells. All but four wells outside the sheeting along Water Street were filled with grout.
• Northern continued removal of bracing sheets and continued backfilling trench along the interceptor alignment on Water Street.
• Northern began prepping the subgrade for pavement restoration. The crew also installed approximately 190 linear feet of curbing.
• The remainder of work activities this week include installing drainage piping, removing bracing sheets, prepping the subgrade for pavement restoration, and general site cleanup.
• Traffic continued to be detoured per construction signage and message boards provided for the project.
• Site cleanup took place at the end of each day.
• Businesses on Water Street remain open to the public while construction activities are ongoing.
• The sidewalk on the harbor side of Water Street between the rotary and  #122 Water Street will be closed this coming weekend for paving. 

Northern will continue work on site next week (week of June 26, 2023) and the following work activities are anticipated to occur:

• General site cleanup and pavement restoration.

Construction activities for this week consisted of the following:

• Northern excavated, installed, backfilled, and compacted approximately 42 linear feet of the 30-inch PVC gravity sewer interceptor along Water Street toward the end of sheeting, between Chilton Street and Howland Street.
• Northern installed the third sewer manhole, at the end of the sheeting.
• Northern's geotechnical engineer (GeoEngineers) was on site this week to monitor the installed piezometers along Water Street.
• The sewer interceptor from the first sewer manhole to the second sewer manhole was jet cleaned to remove silt.
• The remainder of the work activities by Northern this week include trench backfilling, frac tank cleanup, general site cleanup, and demobilization of equipment.
• Traffic continues to be detoured per the construction signage and the message boards provided for the site.
• Site cleanup took place at the end of each day.
• Businesses on Water Street remain open to the public while construction activities are ongoing. Signage indicating this is installed on site and continues to be maintained. 

Northern will continue work on site next week (week of June 19, 2023) and the following work activities are anticipated to occur:

• General site cleanup and prepping the subgrade for pavement restoration.

Construction activities for this week consisted of the following:

• Northern excavated, installed, and backfilled approximately 112 linear feet of the 30-inch PVC gravity sewer interceptor along Water Street towards Chilton Street and a sewer manhole near Chilton Street.
• Northern's relief well driller (Phoenix Foundation Company, Inc.) finished drilling relief wells along the interceptor alignment on Water Street on Monday (6/5). A total of 33 relief wells have been installed to date.
• Northern's geotechnical engineer (GeoEngineers) was on site this week to monitor the installed piezometers along Water Street and record well drilling observations during drilling work.
• Northern will continue excavating and installing the 30-inch PVC gravity sewer interceptor between Chilton Street and Howland Street on Friday, 6/9 and Saturday, 6/10.
• Signage indicating all businesses are open have been installed and continue to be maintained.
• Traffic is continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will continue work on site next week (week of June 12, 2023) and the following work activities are anticipated to occur:

• Continue installation of 30-inch PVC gravity sewer interceptor working towards the end of installed sheeting.
• Install a sewer manhole at the end of the sheeting.
• Continue trench backfilling and site restoration.

Construction activities for this week consisted of the following:

• There were no activities on Monday (5/29) in observance of Memorial Day.
• On Tuesday (5/30), Northern’s well driller (Northern Drill Service, Inc) drilled two boreholes along the interceptor alignment on Water Street. Northern’s geotechnical engineer (GeoEngineers) installed piezometers in the boreholes, monitored subsurface conditions, and recorded well drilling observations on-site during this drilling work.
• On Tuesday (5/30), Wednesday (5/31), and Thursday (6/1), Northern’s relief well driller (Phoenix Foundation Company, Inc.) continued the drilling of relief wells along the interceptor alignment on Water Street. A total of 21 relief wells have been installed to date.
• Northern and their well drillers plan on continuing their drilling operations along Water Street for the remainder of this week. The plan is to work on Friday (6/2) and Saturday (6/3).
• Traffic continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will continue work onsite next week (week of June 5, 2023) and the following work activities are anticipated to occur:

• Based on progress of the relief well system, Northern plans on continuing installation of the gravity sewer interceptor next week.

Construction activities for this week consisted of the following:

• Northern resumed activities on the Water Street Sewer Interceptor project on Monday, 5/22.
• Northern's well driller, Northern Drill Service, Inc., drilled four boreholes along the interceptor  alignment on Water Street on Monday, Tuesday, and Wednesday.
• Northern's relief well driller, Phoenix Foundation Company, Inc., drilled a relief well along the interceptor alignment on Water Street on Wednesday
• Northern's geotechnical engineer, GeoEngineers, installed piezometers in the boreholes, monitored subsurface conditions, and recorded well drilling observations onsite while drilling work occurred.
• Northern's crew monitored the existing crack gauges installed along the interceptor alignment on Water Street and installed additional crack gauges at the Visitors Center.
• Northern's crew assisted the well drillers with their operations and drove additional sheeting near Chilton Street.
• Northern and their well drillers plan to continue drilling operations along Water Street for the remainder of this week, including Saturday, 5/27.
• Traffic continues to be detoured per the construction signage and message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will continue work onsite next week (week of May 29, 2023) and the following work activities are anticipated to occur: 

• No work activities will be performed on Monday, 5/29 in observance of Memorial Day.
• Northern and their well drillers will be onsite next week to continue their drilling operations along Water Street.
• Northern will have their geotechnical engineer onsite to monitor subsurface conditions and record well drilling observations.
• Based on the progress of the relief well system, Northern plans on continuing installation of the gravity sewer interceptor next week.

Construction activities for this week consisted of the following:

• Northern continued removal of bracing sheets along the new sewer interceptor alignment on Water Street this past week.
• Northern repaired leaks inside the first manhole near Memorial Drive, cleaned the manhole, and started building the manhole's bench and invert. Additionally, Northern installed a temporary walk-through for pedestrian traffic between Memorial Drive and Chilton Street.
• Northern placed a 4" asphalt temporary trench patch for the water main work performed on Water Street between Memorial Drive and Chilton Street.
• Traffic continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will resume work on-site next week (week of March 6, 2023) and the following work activities are anticipated to occur:

• Northern will continue daily movement and vibration monitoring surveys.
• Northern to continue installation of earth support and work towards Chilton Street.
• Northern will continue excavation and sewer interceptor piping installation along Water Street toward the second manhole near Chilton Street.
• Northern to install second manhole near Chilton Street.
• Trench backfilling and removal of earth support in previously completed areas.

Construction activities for this week consisted of the following:

• There were no activities on Monday (February 20), in observance of Presidents' Day.
• Northern continued removal of bracing sheets along the new sewer interceptor alignment and relocated equipment down Water Street for the project's next phase.
• On Tuesday (February 21), Northern found and repaired a water main leak at the ductile iron tee near the intersection of Water Street and Memorial Drive. The Plymouth Water Department was contacted to isolate the damaged portion of the main.
• On Wednesday (February 22) and Thursday (February 23), Northern continued the replacement of the drainage piping and catch basins on Water Street.
• Northern also re-stripped the roadway to reflect the two-way traffic on the south side of Water Street as per the updated Traffic Management Plan (Water Street Stage 2B). Additionally, Northern repaired the water service line for the Plymouth Visitor Center and restored the electrical connection for the light pole at the Plymouth Visitor Center.
• Traffic continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will resume work on-site next week (week of February 27, 2023) and the following work activities are anticipated to occur:

• Northern will continue daily movement and vibration monitoring surveys
• Northern to continue installation of earth support and work towards Chilton Street
• Northern to continue to excavate and install sewer interceptor piping along Water Street toward the second manhole near Chilton Street
• Northern to complete replacement of drainage pipe and drainage structures along Water Street

Construction activities for this week consisted of the following:

• Northern Construction Service continued excavating and installing the 30-inch PVC gravity sewer interceptor along Water Street toward Chilton Street. Approximately 102 linear feet of pipe were installed this past week. Pipe joints were sealed prior to backfilling and compacting the trench for the sewer interceptor.
• Northern continued removal of bracing sheets along the alignment on Water Street.
• The dewatering pumps powered down on Sunday (February 5, 2023) due to an issue with the dewatering pump generators. On Monday (February 6, 2023), Northern spent the day dewatering the trench along Water Street and replaced a damaged section of 30-inch PVC with a new section of 30-inch PVC before continuing work activities.
• On Wednesday (February 9, 2023), Northern removed the wellpoint header pipe along Water Street from Station 01+00 to Station 02+50.
• Traffic continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will resume work on-site next week (week of February 13, 2023) and the following work activities are anticipated to occur:

• Northern will continue daily movement and vibration monitoring surveys.
• Continue to excavate and install sewer interceptor piping from the first manhole toward Chilton Street and beyond Chilton Street towards the second manhole.
• Continue installation of earth support, working towards Chilton Street and the second manhole.
• Trench backfilling and removal of earth support in previously completed areas.
• Continue reconstruction of drainage pipes and structures.

Construction activities for this week consisted of the following:

• Northern Construction Service continued excavating and installing the 30-inch PVC gravity sewer interceptor along Water Street toward Chilton Street.
• Timber lagging removal around utilities in the trench along Water Street.
• Trench backfilling and material compaction.
• On Tuesday (January 31, 2023), a significant leak was observed while removing timber lagging near the adjacent water main. The Plymouth Water Department was contacted to isolate the damaged portion of the main. After the leak was contained, the trench was dewatered, and the water main was repaired.
• On Wednesday (February 1, 2023), the crew worked on dewatering four feet of water located between station 03+00 and station 01+00 along Water Street.
• Northern installed two manhole risers and top section to complete buildout of SMH-06.
• Replacement of a hydrant gate box that was removed during the break.
• Jet cleaned the newly installed sewer interceptor to remove debris resulting from the break that occurred on Wednesday (February 1, 2023).
• Traffic continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will resume work on-site next week (week of February 6, 2023) and the following work activities are anticipated to occur:

• Northern will continue daily movement and vibration monitoring surveys.
• Continue to excavate and install sewer interceptor piping from the first manhole (SMH-06) toward Chilton Street.
• Continue installation of earth support, working towards Chilton Street and the second manhole (SMH-05A).
• Trench backfilling and removal of earth support in previously completed areas.
• Begin reconstruction of drainage pipes and structures.
• Week Ending January 27, 2023

Construction activities for this week consisted of the following:

• Northern continued driving steel sheeting along Water Street.
• Excavation and installation of 30-inch PVC gravity sewer interceptor along Water Street toward Chilton Street.
• Timber lagging installation around utilities in the trench along Water Street.
• Trench backfilling and material compaction.
• Installation of safety railing along steel sheeting.
• Fabrication of steel beams for trench shoring.
• Removal of existing drainage manhole and drainage pipes.
• Excavation and installation of first sewer manhole.
• Placing of "No parking sign" barrels on Chilton Street and installation of detour sign at Brewster Street intersection.
• The deep dewatering wells continue to pump groundwater 24 hours a day, seven days a week. The sump pump powered down over the weekend. Therefore, Monday morning (January 23, 2023) was spent dewatering the trench.
• Traffic continued to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup took place at the end of each day.

Northern will resume work on-site next week (week of January 30, 2023) and the following work activities are anticipated to occur:

• Northern will continue daily movement and vibration monitoring surveys.
• Continue to excavate and install sewer interceptor piping from the first manhole toward Chilton Street.
• Continue installation of earth support, working towards Chilton Street and the second manhole.
• Trench backfilling and removal of earth support in previously completed areas.backfilling
• Reconstruction of drainage pipes and structures.
• It is anticipated that groundwater will be under control with the deep wells, and additional sumps will handle any water encountered in the trench during the excavations. The contractor will re-evaluate and install as required if a vacuum pump system is needed.

Construction activities for this week consisted of the following:

• Northern continued driving steel sheeting using a hydraulic hammer within the excavated pavement along the first 300 feet of the interceptor alignment.
• The well point dewatering system is running continuously on a 24/7 basis while construction is ongoing.
• Traffic will continue to be detoured per the construction signage and the message boards provided for the project.
• Site cleanup takes place at the end of each day
• Northern will also be working on-site on Saturdays for the next several weeks.

Northern will resume work on-site next week (week of January 16, 2023) and the following work activities are anticipated to occur:

• No work on site on Monday, January 2016 in observance of Martin Luther King Jr. Day
• Northern will continue to drive the remainder of the first 300 feet of sheeting and will continue lagging
• Excavation and pipeline installation will start. It is anticipated that groundwater will be under control with the deep wells. Any water encountered in the trench during the excavation will be handled by additional sumps. Should a vacuum pump system be required, the contractor will re-evaluate and install as required.
• Geotechnical monitors will continue to be monitored daily during construction, including vibration.

Construction activities for this week consisted of the following:

• Northern continued driving steel sheeting using a hydraulic hammer within the excavated pavement along the first 300 feet of the interceptor alignment.
• The well point dewatering system was activated this week and will be running continuously on a 24/7 basis while construction is ongoing.
• Northern installed additional security fencing on jersey barriers near the Water Street rotary for protection of existing crew and equipment.
• Site cleanup will take place on Friday in preparation for the weekend.
• Traffic will continue to be detoured per the construction signage and the message boards provided for the project

Northern will resume work on-site next week (week of January 9, 2023) and the following work activities are anticipated to occur:

• Northern will have two crews working on-site next week:
  • One crew will continue to drive sheeting within the excavated pavement along the first 300 feet of the project
  • The second crew will begin excavation to below pipe subgrade at the manhole closest to the Water Street rotary. Once excavation is below pipe subgrade, Northern will connect the new 30-inch PVC gravity sewer interceptor to the existing 30" pipe stub and proceed with the gravity sewer interceptor installation.
• Vibration monitors will be recording vibration activities on site as the contractor drives sheeting below grades. Should vibration readings exceed thresholds, effort will stop, and appropriate adjustments will be made to mitigate this issue.
• Geotechnical monitors will be monitored daily during construction activities to ensure there will be no movements of sidewalks, walls, and other features along the alignment.