Infiltration and inflow (I/I) is excess water that flows into sewer pipes from groundwater and stormwater.
Groundwater (infiltration) seeps into sewer pipes through holes, cracks, joint failures, and faulty connections.
Stormwater (inflow) rapidly flows into sewers via roof drain downspouts, foundation drains, storm drain cross-connections, and through holes in manhole covers.
Most I/I is caused by aging infrastructure that needs maintenance or replacement.
2021 Inflow & Infiltration
The Town's consultants, Weston & Sampson, and contractor, National Water Main Cleaning Company, began daytime cleaning and inspection of sewer lines on Monday, March 29, 2021 They will be nighttime flow isolation later this week.
Daytime: cleaning/television of sewer pipelines and inspection on sewer manholes will be conducted between 7 am -5 pm. During these routine inspections, the sewer pipelines are cleaned hydraulically with a pressurized water truck and a sewer-jetting nozzle and television inspected with a closed-circuit television inspection (CCTV) camera. The vacuum pressure created by the cleaning may cause air to escape through the traps and drains of your plumbing fixtures such as toilets and sinks. These inspections are conducted between 7 am and 5 pm. Weston & Sampson may need to access your property to conduct the investigations in sanitary sewer easements operated and maintained by the Town.
Nighttime: flow measurements are also being performed as part of the investigations between midnight (12 am) and 6 am. Flow measurements only require work crews to access sewer manholes and does not require cleaning. Work crews will have police officer detail with them at all times during nighttime flow isolation.
These investigations are being conducted as part of Shrewsbury’s 2021 Infiltration Investigations Project. The purpose of the investigations is to locate sources of groundwater entering the sanitary sewer. By removing this extra flow, Shrewsbury will reduce the amount of wastewater it sends to the regional Westborough Wastewater Treatment Plant.
Where & When
DAYTIME WORK LOCATIONS FOR APRIL 2021:
Daytime work will be ongoing in the following areas:Ashley Drive, Barnard Street, Boxford Drive, Browning Road, Bryant Avenue, Bunker Hill Road, Cabot Drive, Concord Road, Dalton Drive, Deerfield Road, Essex Drive, Flamingo Circle, Forest Hill Drive, Hill Street, Ireta Road, Lenox Drive, Lexington Road, Longfellow Road, Main Street (between Gage Lane and I-290), Manor Road, Millwood Drive, Minuteman Way, Old Mill Road, Oxford Drive, Pondview Drive, Rawson Place, Rolling Hill Road, Stratton Drive, Straw Hollow Lane, Tanglewood Drive, Tory Drive, Tory Lane, Van Ness Avenue, View Street, Wachusett Avenue, Wachusett Circle, Wadsworth Road, Westbrook Crossing Drive, and Westview Avenue.
Daytime work has been completed on: Flamingo Circle, Oriole Circle, Cardinal Circle, Egret Circle, Crane Circle, Sandpiper Drive, Audubon Drive, Willet Drive, Swan Circle, Mallard Circle, Eagle Drive, Tern Drive, Ptarmigan Drive, O’Donnell Avenue, Dana Road, Deergrass Road, Ireta Road, and Thestland Drive.
NIGHTTIME WORK LOCATIONS FOR APRIL 12 – 17, 2021:
Nighttime work will be performed this week on: Flamingo Circle, Oriole Circle, Cardinal Circle, Egret Circle, Crane Circle, Sandpiper Drive, Audubon Drive, Willet Drive, Swan Circle, Mallard Circle, Eagle Drive, Tern Drive, Ptarmigan Drive, O’Donnell Avenue, Dana Road, Deergrass Road, Ireta Road, Thestland Drive, and Main Street (between Thestland Drive and I-290).
This project will be ongoing until the end of June. Work will take place in the following areas:
We apologize for any inconvenience you may experience during this work and appreciate your continued cooperation while we strive to improve our sanitary sewer system. If you have any questions or experience any inconvenience related to the inspection work described above, please contact the Department of Public Works - Water and Sewer Division at (508) 841-8502 or firstname.lastname@example.org