Week 18

Week 18 Update:

The contractor completed water main installation into the Clay Street intersection and moved on to sanitary sewer installation near Western Avenue.   The work required a large sanitary sewer junction chamber to be removed and replaced which required heavy equipment and a wrecking ball to remove the large concrete structure in pieces.  An old abandoned storm sewer was found in the vicinity (riveted steel pipe) that likely conveyed water to Muskegon Lake prior to development in this area.

The water treatment facility was setup in Webster Avenue to treat groundwater that was detected with levels of Mercury that exceeded the amount to be discharged directly to surface waters.  The area with Mercury is located between Clay and Webster.  The water will be routed through this facility to treat the Mercury and discharged to surface waters after adequate treatment.

The crew also begin the process of drilling helical piers underneath proposed storm and sanitary sewer manholes.  The piers are necessary due to the poor structural integrity of the underlying soils.  The piers are being drilled 40-50 feet in depth to extend past all of the organic soils, including wood and sawdust, and for proper torque to be achieved.

         

Above:  The water treatment facility units

         

Above:  Water main work is completed and helical piers are being driven to support manhole structures.

         

Above:  The existing junction chamber removed and replaced with a precast concrete manhole

Above:  Typical underlying soils (wood and debris) located under Spring Street

Work Upcoming the Week of April 12:

The Contractor will continue to prepare manhole and catch basin structure locations for helical piers.  Due to the high groundwater levels and poor soils the preparation work for the piers has been a slow process.  The Contractor will continue with sanitary sewer installation at the connection point near Western and extend easterly towards Clay Avenue.