HomeMy WebLinkAboutFINAL - December 2018 Quarterly Gas Monitoring Report - Nantucket Landfill, Nantucket
REPORT
Summary of Landfill Gas
Sampling Results
Nantucket Landfill
Nantucket, Massachusetts
December 2018
75 State Street, Suite 701
Boston, Massachusetts 02109
tel: 617 452-6000
March 7, 2019
Mr. Mark Dakers
Massachusetts Department of Environmental Protection
Southeast Regional Office
20 Riverside Drive
Lakeville, Massachusetts 02347
Subject: Summary of Landfill Gas Sampling - December 2018
Nantucket Landfill
Nantucket, Massachusetts
Dear Mr. Dakers:
On December 5, 2018, CDM Smith Inc. (CDM Smith) personnel field analyzed landfill gas samples at the
Nantucket Landfill in Nantucket, Massachusetts. The sampling was performed in accordance with the
Massachusetts Solid Waste Management Regulations (310 CMR 19.132) and the approved
Environmental Monitoring Plan, prepared by SECOR International Inc., in July 1999 for the landfill.
Post-closure landfill gas monitoring consisted of sampling 13 landfill gas wells, including LGW-1 through
LGW-13 and two landfill gas probes, Probes #1, #2 as shown on the attached site plan. Each well and
location was sampled for methane (CH4) in percent volume and lower explosive limit (LEL), carbon
dioxide (CO2), oxygen (O2), using a Landtec GEM 2000 Gas Analyzer; volatile organics using an organic
vapor meter (OVM), lamp eV 10.6; and hydrogen sulfide (H2S) using an Interscan1000 Meter.
The following summarizes the results of the gas sampling:
Methane was detected above the regulatory limit of 25% of the LEL in well location LGW-9 during
this round. The final concentration in LGW-9 was 4.9% by volume, equivalent to 98% of the LEL.
Probe #1 and Probe #2 were installed this round to detect gas migration around LGW-9; methane
was detected in Probe #1 with a final concentration of 0.3% by volume equivalent to 6 % of the
LEL and Probe #2 was non-detect for methane. . Probe #1 and Probe #2 results indicate that
methane is not migrating beyond the property boundary. Exceedances at this monitoring location
were sent to MassDEP within the 24-hour notification time frame.
Methane was only detected in LGW-9, methane was not detected at any of the other monitoring
locations.
Carbon dioxide was detected in all monitoring locations with final concentrations ranging from
0.2% to 10.9%.
Mr. Mark Dakers
March 7, 2019
Page 2
Oxygen was detected in all monitoring locations at final concentrations between 5.1% and 20.5%.
Hydrogen sulfide was not detected at any monitoring locations.
VOCs were not detected at any of the monitoring locations.
Prior to the October 2013 sampling round, landfill gas had been consistently detected in monitoring well
LGW-9, located on the south side of the site near the compost pad. Subsequently, an adjacent compost
pile to LGW-9 was removed which resulted in no landfill gas detected at LGW-9 in sampling rounds
conducted during October and December 2013. Since 2013, the compost pile has fluctuated in size; the
gas results have been consistent with the fluctuations of the compost pile’s size
The next sampling round will be completed in March 2019.
Please do not hesitate to call me at (617) 452-6635 if you have any questions or require additional
information.
Very truly yours,
Mary Mancini, P.E., BCEE
Senior Project Manager
CDM Smith Inc.
Attachments
cc: Robert D. McNeil, Nantucket Public Works Director
Kaitlyn Shaw, Nantucket
Whitney Hall, Waste Options
File: 1910/78240/03/05/01/2018/December 2018
Appendix A
Site Plan
Appendix B
Sampling Results Summary Tables
Table 1 Nantucket LandfillNantucket, MassachusettsLandfill Gas Sampling Summary - December 2018 LEL (%)Initial Final Initial Final Initial Final Initial Final Initial Final Initial FinalLGW-1Well12/5/20180.00.00.00.00.00.00.00.01.81.820.219.630.05LGW-2Well12/5/20180.00.00.00.00.00.00.00.02.12.219.319.130.12LGW-3Well12/5/20180.00.00.00.00.00.00.00.01.61.620.820.230.05LGW-4Well12/5/20180.00.00.00.00.00.00.00.01.00.619.920.430.05LGW-5Well12/5/20180.00.00.00.00.00.00.00.04.95.019.015.330.05LGW-6Well12/5/20180.00.00.00.00.00.00.00.010.410.511.27.130.10LGW-7Well12/5/20180.00.00.00.00.00.00.00.05.710.914.65.130.10LGW-8Well12/5/20180.00.00.00.00.00.00.00.00.40.220.120.330.10LGW-9Well12/5/20180.00.00.00.05.84.9116.098.05.34.517.418.130.05Probe-1Probe12/5/20180.00.00.00.00.30.36.06.03.12.819.019.530.05Probe-2Probe12/5/20180.00.00.00.00.00.00.00.04.95.017.715.830.05Probe-3Probe12/5/2018NSNSNSNSNSNSNSNSNSNSNSNSNSProbe-4Probe12/5/2018NSNSNSNSNSNSNSNSNSNSNSNSNSLGW-10Well12/5/20180.00.00.00.00.00.00.00.00.70.720.620.230.05LGW-11Well12/5/20180.00.00.00.00.00.00.00.00.70.220.820.930.05LGW-12Well12/5/20180.00.00.00.00.00.00.00.02.42.519.319.130.10LGW-13Well12/5/20180.00.00.00.00.00.00.00.00.40.320.120.530.10Notes: (1) Probes and wells were purged for approximately 10 minutes before final readings were recorded. (2) Methane, oxygen and carbon dioxide, measured with GEM-2000 combustible gas meter. (3) Volatile Organic Compounds (VOCs) measured with an Organic Vapor Meter (OVM), lamp eV 10.6. (4) Hydrogen Sulfide measured with an Interscan1000 meter. (5) Probe -3 and Probe-4 were not installed this round. Gas Monitoring LocationsH2S (ppm)CH4 (% by Vol.)CO2 (%)Barometric Pressure (In. Hg)O2 (%)VOCs (ppmv)Type Date 1910-78240-05-01
Appendix C
24 Hour Landfill Exceedance Notification
12/6/2018
1
Journeay, Patrick M.
From:Journeay, Patrick M.
Sent:Thursday, December 06, 2018 12:13 PM
To:Mark.Dakers@state.ma.us
Cc:Robert McNeil; Santoro Jr, Frederic; colleen.ferguson@state.ma.us; Mancini, Mary
Subject:24-hour Gas Exceedance Notification - Nantucket Landfill, Nantucket
Attachments:Final Nantucket Landfill EMP Map.pdf
Good morning Mark,
In accordance with 310 CMR 19.132 (5) (h), CDM Smith on behalf of the Town of Nantucket hereby notify MassDEP that
during landfill gas sampling on December 5, 2018, the concentration of methane gas exceeded 25% of the Lower
Explosive Limit (LEL) at one landfill gas well located to the east of the landfill site. The percent of the LEL by volume
detected at these locations are as follows:
LGW-9 98 % LEL
Probe #1 6 % LEL
Probe #2 0 % LEL
Landfill gas well LGW-9 is located adjacent to Massasoit Bridge Road which is an unpaved narrow path in the southeast
corner of the site. LGW-9 had a methane gas exceedance of 98% LEL. An additional probe, Probe #1 was conducted
closer to the road and fence line approximately 6-8 feet in a southern direction from LGW-9; gas was detected at 6% of
the LEL in Probe #1. One additional probe was conducted approximately 10-15 feet south from Probe #1; no gas was
detected in this probe. The results of this sampling round are consistent with previous sampling rounds. The well is
located near a composting pile and is approximately several hundred feet away from the active landfill, we do not
believe the methane detected in this well is from the landfill cell. There are no houses or utilities in this area; it is open
land with dense vegetation. Attached is a site plan showing the landfill gas monitoring locations.
A report summarizing all the sampling results will be submitted in the next few weeks.
Please feel free to call or email Mary Mancini at (617) 452-6635 or mancinimc@cdmsmith.com if you have any questions
or require any additional information.
Thank you,
Patrick
Patrick Journeay
Environmental Engineer
CDM Smith
75 State Street, Boston, MA 02109
617.452.6632
cdmsmith.com
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Monitoring Program Sampling Locations
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