Town of
Nassau
Dewey Loeffel Landfill Cleanup

Dewey Loeffel Landfill Cleanup

Click here for updates and files from 2017.

 

Click here for updates and files from 2016. 

 

 


Dewey Loeffel Landfill Superfund Site: Recent and Upcoming Field Work:  June 14, 2018

Supervisor Fleming and Superintendent McCagg,

 

Below is a summary of upcoming field work that is anticipated to occur outside of the landfill property itself, as well as some other notable upcoming or recently completed site activities.

  • Landfill/Groundwater Investigation:
    • As part of the investigation of shallow and deep groundwater, 52 wells were installed at 22 locations in 2017. Several different sampling and testing activities were completed in these new wells throughout 2017 and 2018 (see previous updates for details). 
    • The second of two site-wide groundwater sampling events, which includes sampling of the new wells, began in May 2018 and is scheduled to be completed in June 2018. The results of the sampling will be used to help determine the nature and extent of groundwater impacts.
    • Following the completion of the second site-wide groundwater sampling event, hydraulic conductivity testing is scheduled to be conducted in July 2018 for the new shallow groundwater wells to measure how readily groundwater flows in the surrounding aquifer.
  • Drainageways Investigation:
    • No field work is expected in the next month.
  • Removal Action for Tributary T11A:
    • The detailed design of the removal action, including habitat restoration, was completed in June 2018, and will be followed by implementation of the removal action later in the summer and the fall of 2018. A public information session will be held prior to the start of the construction for the Removal Action in Tributary T11A.
  • Monitoring and Other Activities:
    • The next residential well monitoring event is scheduled for August 2018 and will include residential wells monitored on a quarterly basis.
    • The first semi-annual groundwater sampling event of 2018 began in May and is scheduled to be completed in June 2018. The next semi-annual groundwater sampling event is scheduled for fall 2018.
    • The annual surface water monitoring program, which includes the collection and analysis of surface water samples from the site drainageways in three separate events, is scheduled to be conducted during the summer and fall of 2018.
    • The annual fish monitoring program, which includes the collection and analysis of fish tissue samples from the Valatie Kill and Nassau Lake, is scheduled to be conducted in late June 2018 (weather permitting). 
  • Some of the abovementioned activities may be visible along roadways, such as Mead Road, Central Nassau Road and Curtis Hill Road.

 


EPA Update on Loeffel Superfund - April 16, 2018

 

Below is a summary of upcoming field work that is anticipated to occur outside of the landfill property itself, as well as some other notable upcoming or recently completed site activities.
  • Landfill/Groundwater Investigation:
    • As part of the investigation of shallow groundwater, the installation of 38 shallow wells at 19 locations both inside and outside of the landfill was completed in May 2017. Consistent with the approved investigation work plan, the locations and depths of these new wells were selected based upon the results of the direct-sensing investigation and the discrete groundwater and soil sampling conducted in 2016. Hydraulic conductivity testing, which measures how readily groundwater flows in the surrounding aquifer, was performed in the new shallow wells in summer 2017. The first site-wide groundwater sampling event, including the new wells, was completed in October 2017. Samples of non-aqueous phase liquid (NAPL) were collected in November 2017 and December 2017. The near-continuous water level monitoring program began in October 2017 and is scheduled to continue into May 2018. Following the conclusion of the near-continuous water level monitoring program, a second site-wide groundwater sampling event is scheduled to be conducted in late May 2018 and June 2018.
    • As part of the investigation of deep bedrock groundwater, three new deep bedrock boreholes were installed between December 2016 and February 2017. Several different sampling and testing activities were completed in the three bedrock boreholes between March 2017 and August 2017 (see previous updates for details). The three boreholes were converted into multi-level monitoring wells in November 2017 and are scheduled to be sampled in May-June 2018 as part of the second site-wide groundwater sampling event in order to help determine the nature and extent of deep groundwater impacts.
    • As part of the investigations of both shallow and deep groundwater, monthly water level measurements were collected in May 2017-April 2018 for the new and existing monitoring wells, as well as for three surface water staff gauges located in Valley Stream. Water level measurements are scheduled to be collected at these locations again in May 2018.
  • Drainageways Investigation:
    • No field work is expected in the next month.
  • Removal Action for Tributary T11A:
    • In accordance with the approved sampling and analysis plan, soil and sediment samples were collected from 175 locations in November 2017, 62 locations in January 2018, and an additional 22 locations in March 2018. Additional habitat assessment work is scheduled for the week of April 16, 2018 to supplement the habitat assessment information collected in fall 2018. All of the soil, sediment and habitat assessment data will be included and summarized in a Data Summary Report. A detailed design of the removal action, including habitat restoration, is expected to be completed in spring 2018, followed by implementation of the removal action during the summer and fall of 2018.
  • Monitoring and Other Activities:
    • The next residential well monitoring event is scheduled for May 2018 and will include residential wells monitored on a quarterly and semi-annual basis.
    • The next semi-annual groundwater sampling event is scheduled for late May 2018.
  • Some of the abovementioned activities may be visible along roadways, such as Mead Road, Central Nassau Road and Curtis Hill Road.

 

 


EPA Update on Loeffel - March 14, 2018

 

Below is a summary of upcoming field work that is anticipated to occur outside of the landfill property itself, as well as some other notable upcoming or recently completed site activities.

  • Landfill/Groundwater Investigation:
    • As part of the investigation of shallow groundwater, the installation of 38 shallow wells at 19 locations both inside and outside of the landfill was completed in May 2017. Consistent with the approved investigation work plan, the locations and depths of these new wells were selected based upon the results of the direct-sensing investigation and the discrete groundwater and soil sampling conducted in 2016. Hydraulic conductivity testing, which measures how readily groundwater flows in the surrounding aquifer, was performed in the new shallow wells in summer 2017. The first site-wide groundwater sampling event, including the new wells, was completed in October 2017. Samples of non-aqueous phase liquid (NAPL) were collected in November 2017 and December 2017. The near-continuous water level monitoring program began in October 2017 and is scheduled to continue into spring 2018. In accordance with the approved work plan, the temporary shutdown and start-up of several extraction wells was conducted from February 2-5, 2018 and March 9-12, 2018 in order to further evaluate the interaction between the extraction wells and water levels at and near the landfill. As a result, the flow rate of groundwater to the treatment plant was reduced during these time periods. Following the conclusion of the near-continuous water level monitoring program, a second site-wide groundwater sampling event is scheduled to be conducted in late spring 2018.
    • As part of the investigation of deep bedrock groundwater, three new deep bedrock boreholes were installed between December 2016 and February 2017. Several different sampling and testing activities were completed in the three bedrock boreholes between March 2017 and August 2017 (see previous updates for details). The three boreholes were converted into multi-level monitoring wells in November 2017 and are scheduled to be sampled in spring 2018 as part of the second site-wide groundwater sampling event in order to help determine the nature and extent of deep groundwater impacts.
    • As part of the investigations of both shallow and deep groundwater, monthly water level measurements were collected in May 2017-February 2018 for the new and existing monitoring wells, as well as for three surface water staff gauges located in Valley Stream. Water level measurements are scheduled to be collected at these locations again in March 2018 and April 2018.
  • Drainageways Investigation:
    • No field work is expected in the next month.
  • Removal Action for Tributary T11A:
    • In accordance with the approved sampling and analysis plan, soil and sediment samples were collected from 175 locations in November 2017 and 62 locations in January 2018. Soil and Sediment samples are scheduled to be collected from an additional 11 locations during the week of March 19, 2018. The results of the November 2017 and January 2018 sampling will be summarized in a Data Summary Report, with the results of subsequent sampling events summarized in an addendum. 
  • Monitoring and Other Activities:
    • The next residential well monitoring event is scheduled for May 2018 and will include residential wells monitored on a quarterly and semi-annual basis.
  • Some of the abovementioned activities may be visible along roadways, such as Mead Road, Central Nassau Road and Curtis Hill Road.

 


EPA Update on Loeffel - February 15, 2018

Subject: Dewey Loeffel Landfill Superfund Site: Recent and Upcoming Field Work

 

Below is a summary of upcoming field work that is anticipated to occur outside of the landfill property itself, as well as some other notable upcoming or recently completed site activities.

  • Landfill/Groundwater Investigation:
  •  
    • As part of the investigation of shallow groundwater, the installation of 38 shallow wells at 19 locations both inside and outside of the landfill was completed in May 2017. Consistent with the approved investigation work plan, the locations and depths of these new wells were selected based upon the results of the direct-sensing investigation and the discrete groundwater and soil sampling conducted in 2016. Hydraulic conductivity testing, which measures how readily groundwater flows in the surrounding aquifer, was performed in the new shallow wells in summer 2017. The first groundwater sampling event for the new wells was completed in October 2017. Samples of non-aqueous phase liquid (NAPL) were collected in November 2017 and December 2017. The near-continuous water level monitoring program began in October 2017 and is scheduled to continue into spring 2018. In accordance with the approved work plan, the first temporary shutdown and start-up of several extraction wells was conducted from February 2-5, 2018 in order to further evaluate the interaction between the extraction wells and water levels at and near the landfill. As a result, the flow rate of groundwater to the treatment plant was reduced during this time period. A second shutdown/startup monitoring event is tentatively scheduled for early March 2018. The schedule for this shutdown/startup monitoring event is subject to change based on precipitation and it is anticipated to be approximately 72 hours in duration.
    • As part of the investigation of deep bedrock groundwater, three new deep bedrock boreholes were installed between December 2016 and February 2017. Several different sampling and testing activities were completed in the three bedrock boreholes between March 2017 and August 2017 (see previous updates for details). The three boreholes were converted into multi-level monitoring wells in November 2017 and are scheduled to be sampled in spring 2018 to help determine the nature and extent of deep groundwater impacts.
    • As part of the investigations of both shallow and deep groundwater, monthly water level measurements were collected in May 2017-February 2018 for the new and existing monitoring wells, as well as for three surface water staff gauges located in Valley Stream. Water level measurements are scheduled to be collected at these locations again in March 2018.
  • Drainageways Investigation:
  •  
    • No field work is expected in the next month.
  • Removal Action for Tributary T11A:
  •  
    • In accordance with the approved sampling and analysis plan, soil and sediment samples were collected from 175 locations in November 2017 and an additional 62 locations in January 2018. The results of the January 2018 sampling are under EPA review and will be summarized in a Data Summary Report along with the results of the November 2017 sampling.
  • Monitoring and Other Activities:
  •  
    • The next residential well monitoring event is scheduled for May 2018 and will include residential wells monitored on a quarterly and semi-annual basis.
  • Some of the abovementioned activities may be visible along roadways, such as Mead Road, Central Nassau Road and Curtis Hill Road.

 


EPA UPDATE: January 17, 2018
 

Below is a summary of the upcoming field work that is anticipated to occur outside of the landfill property itself, as well as some other notable upcoming or recently completed site activities.

  • Landfill/Groundwater Investigation:
    • As part of the investigation of shallow groundwater, the installation of 38 shallow wells at 19 locations both inside and outside of the landfill was completed in May 2017. Consistent with the approved investigation work plan, the locations and depths of these new wells were selected based upon the results of the direct-sensing investigation and the discrete groundwater and soil sampling conducted in 2016. Hydraulic conductivity testing, which measures how readily groundwater flows in the surrounding aquifer, was performed in the new shallow wells in summer 2017. The first groundwater sampling event for the new wells was completed in October 2017. Samples of non-aqueous phase liquid (NAPL) were collected in November 2017 and December 2017. The near-continuous water level monitoring program began in October 2017 and is scheduled to continue into spring 2018. In accordance with the approved work plan, the temporary shutdown and start-up of several extraction wells is scheduled for the week of January 26, 2018 in order to further evaluate the interaction between the extraction wells and water levels at and near the landfill. The schedule for this shutdown/startup monitoring event is subject to change based on precipitation and it is anticipated to be approximately 72 hours in duration. As a result, the flow rate of groundwater to the treatment plant will be reduced during this event. A second shutdown/startup monitoring event is tentatively scheduled for mid-February 2018.
    • As part of the investigation of deep bedrock groundwater, three new deep bedrock boreholes were installed between December 2016 and February 2017. Several different sampling and testing activities were completed in the three bedrock boreholes between March 2017 and August 2017 (see previous updates for details). The three boreholes were converted into multi-level monitoring wells in November 2017 and are scheduled to be sampled in spring 2018 to help determine the nature and extent of deep groundwater impacts.
    • As part of the investigations of both shallow and deep groundwater, monthly water level measurements were collected in May 2017-January 2018 for the new and existing monitoring wells, as well as for three surface water staff gauges located in Valley Stream. Water level measurements are scheduled to be collected at these locations again in February 2018.
  • Drainageways Investigation:
    • No field work is expected in the next month.
  • Removal Action for Tributary T11A:
    • In accordance with the approved sampling and analysis plan, soil and sediment samples were collected from approximately 175 locations in the tributary in November 2017. The results of the November 2017 sampling were received in December 2017. The collection of an additional 62 soil and sediment samples is scheduled to be completed during the week of January 15, 2018 to further delineate PCBs in the tributary. Following the receipt of the analytical data, a Data Summary Report will be submitted summarizing the results of both sampling events.
  • Monitoring and Other Activities:
    • The next residential well monitoring event is scheduled for February 2018 and will include residential wells monitored on a quarterly basis.
  • Some of the abovementioned activities may be visible along roadways, such as Mead Road, Central Nassau Road and Curtis Hill Road.