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Dec 12
Friends of the Malden River meeting, 6:30-8PM Cambridge Health Alliance, 195 Canal Street, Malden

Jan 3
Committee Meeting, 7-9PM
Tufts University, Tisch College of Citizenship & Public Service, Lincoln Filene Hall, Rabb Room, 10 Upper Campus Road, Medford

REMEDIATION UPDATES AT THE WYNN RESORTS SITE

Regular updates about the remediation process of this Mystic River waterfront site are posted here. There are three main areas of remediation. Information is provided by GZA - the Licensed Site Professional - as well as Wynn staff. Check back often!

Learn more about this project.

Tuesday
Sep062016

Doing the Dirty Work

Guest blog post and photos by Alexandra Kulich

August 31, 2016

After a successful Phase I remediation, construction is in full swing on the Wynn Boston Harbor Resort in Everett. The heavily contaminated soil has been transported off-site without incident!

With new holes being dug every day, soil management is still a central task.

Now you might be asking yourself, what’s so special about dirt? Well, it’s quite a bit more complicated than that.

Much of the soil can be categorized as typical urban fill. Before excavation began, soil samples were taken to ensure proper soil disposal and if necessary, treatment prior to disposal. All work is overseen by a Licensed Site Professional (LSP).

At the moment, numerous large dirt piles stand throughout the site. The piles are classified into half a dozen different soil categories based on the sampling results. As a result, the piles must be segregated and well-labeled to prevent mixing.  

Soils are set to be shipped to a variety of locations depending on quantity and classification. To mitigate the disposal process, railroad tracks have been built along the west side of the site parallel to the planned service road. Workers started loading the first set of train cars this week!  

All in all, the soil disposal process requires a lot of care and complexity, where every little pebble counts.

Friday
Mar042016

WYNN REMEDIATION UPDATE: MARCH 4, 2016

Remediation is wrapping-up! The following updates were reported for the week of February 22nd:

In Area 2, also reported as Area CES-2 and known for its high concentrations of arsenic and lead, backfilling of the excavated area was completed.

Petroleum-impacted soil around of the previously discovered underground storage tank was excavated.

Leaving the site: a trailer of brush and four truckloads of contaminated soil were transported off-site for disposal this week. Several stockpiles of soil generated during remediation remain on-site, but will be transported off-site for disposal over the next several weeks.

The perimeter air-monitoring system was operational all week. One dust alert was issued related to the handling of wood debris, resulting in the implementation of dust-mitigation procedures.

Wednesday
Feb172016

Wynn Remediation Update: February 11, 2016

During the week of February 1, 2016, the following occurred: 

In Area 2, also referred to as Area CES-2, crews continued to backfill the excavation areas and remove the excavation support features.

Success! In Area 3 (the Low pH Area) the In-situ solidification/stabilization (ISS) mixing of impacted soils was completed, successfully filling 333 cells (each cell is approximately 15 feet by 10 feet by approximately 11 feet deep). Backfilling of the area commenced, and the ISS batch plant was dismantled and transported off-site.

Three truckloads of concrete debris were transported off-site and no contaminated soil was transported off-site this week.  Several stockpiles of soil generated during the remediation remains on-site and will be transported off-site for disposal over the next several weeks.

Finally, the perimeter air-monitoring system was operational all week with no alarm conditions reported.

With the completion of raising the low pH and sealing soil contaminates by mixing soil with cement, clean fill was placed atop the 333 cells in Area 3. Also, the sheet piles were removed. ©David Mussina.After soil samples indicated that Area 2, aka Area CES-2, was free of lead and arsenic, excavation stopped. The site is being filled with clean soil. ©David Mussina.

Thursday
Jan282016

Wynn Remediation Update: January 28, 2016

During the week of January 18th, 2016 the following occurred: 

  • Excavation of impacted soil from Area 1 (also reported as the A-5 Area) continued.  The soil was stockpiled on-site for future off-site disposal;
  • A small volume of additional impacted soil was excavated from the Area 2 (also reported as the CES-2 Area) based on confirmatory data collected last week. The soils were stockpiled on-site for future off-site disposal;
  • In-situ solidification/stabilization (ISS) mixing of impacted soils in Area 3 (the Low pH Area) continued with approximately 305 of 333 cells completed by end-of-day on Saturday;
  • A total of 61 truckloads of contaminated soil were transported off-site for disposal. The soil was transported in lined trailers which were cleaned and inspected before leaving the site.

The perimeter air-monitoring system was operational all week. Two site-related dust alerts were generated.  One event was caused by a vehicle parked too close to a monitoring station and the second occurred during loading of tunnel muck into a truck. In each case work was ceased, the situation was assessed and corrective actions were initiated.

To excavate the deeper layers of contaminated soil in Areas 1 and 2, groundwater had to be removed. These four wells in Area 2, also referred to as Area CES-2, were dug so groundwater could be pumped from the site. ©David Mussina.

Groundwater from Areas 1 and 2 was then pumped into two weir tanks. This is the second and larger tank. An added coagulate, which helps separate the contaminated silt from water, is being mixed with the water. A series of weirs follow the mixing enabling the silt to slowly settle to the bottom. ©David Mussina.The settling of silt. ©David Mussina.

The two tanks in the foreground have fine mesh filters, which capture any remaining particulates. Water is next pumped through the three larger tanks with charcoal filters. ©David Mussina.

Water meeting drinking water standards is returned to the soil at this groundwater recharge area. ©David Mussina.

Friday
Jan222016

Wynn Remediation Update: January 22, 2016

During the week of January 11th the following work was reported:

In Area 2 (also reported as the CES-2 Area) the excavation of impacted soils was completed, pending confirmatory analytical results.  The soils were stockpiled on-site for future off-site disposal.

In Area 3 (the low pH Area located at the site peninsula) the In-situ solidification/stabilization (ISS) mixing of impacted soils continued. The ISS area was expanded to include an additional 11 cells.  255 of 333 cells were completed by end-of-day on Saturday, January 16th. (As noted in previous updates, In-situ solidification/stabilization is a cleanup method that binds the contaminated waste in a solid block of material, such as cement, and traps it in place.  In-situ solidification/stabilization prevents the contaminated waste from leaching above safe levels into the surrounding environment (ie. the Mystic River). The typical size of each cell is 15 feet by 10 feet by approximately 11 feet deep.)

Additional progress was made in the removal of 78 truckloads of contaminated soil. The soil was transported off-site for disposal in lined trailers which were cleaned before leaving the site. Soil from the site is transported to the following landfills, where it is cataloged: Turnkey Landfill located in Rochester, New Hampshire; Stablex Canada, Inc. located in Blainville, Quebec; and US Ecology, located in Belleville, Michigan.

The perimeter air-monitoring system was operational all week with no alarm conditions recorded.

Excavators at work in Area 2. ©David Mussina.

David Durham from Charter measuring the depth of the soil within Area 2, after which Kyle Maxfield from GZA will take a soil sample at that depth. ©David Mussina.

Kyle Maxfield with soil samples from Area 2. ©David Mussina.Soil samples and where taken at Area 2, Dec 11, 2015. When the analysis of soil samples indicate the absence of arsenic and heavy metals, the excavation of Area 2 will end. ©David Mussina.