HomeMy WebLinkAbout2016-12 Quarterly Gas Report - Nantucket Landfill
REPORT
Summary of Landfill Gas
Sampling Results
Nantucket Landfill
Nantucket, Massachusetts
December 2016
75 State Street, Suite 701
Boston, Massachusetts 02109
tel: 617 452-6000
March 1, 2017
Mr. Mark Dakers
Massachusetts Department of Environmental Protection
Southeast Regional Office
20 Riverside Drive
Lakeville, Massachusetts 02347
Subject: Summary of Landfill Gas Sampling
December 2016
Nantucket Landfill
Nantucket, Massachusetts
Dear Mr. Dakers:
On December 12, 2016, 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 three landfill gas probes, Probes #1, #2, and #3 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 reportable concentrations in well LGW-9. The final
concentration was 2.7% by volume, equivalent to 54%, above the regulatory limit of 25% of
the LEL at the property line. Probe#1, #2 and #3 were conducted but were all non-detect for
methane. This exceedance was reported within the required 24-hour time period. Appendix
C contains a copy of the notification made to MassDEP on December 12, 2016.
Carbon dioxide was detected in all monitoring locations except for LGW-13 with final
concentrations ranging from 0.4% to 8.9%.
Oxygen was detected in all monitoring locations at final concentrations between 9.1% and
20.9%.
Mr. Mark Dakers
March 1, 2017
Page 2
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 then, the compost pile has
increased in size and current sampling results for LGW-9 are generally consistent with pre-2013
concentrations.
The next quarterly sampling round is scheduled for March 2017.
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
c: Robert D. McNeil, Nantucket Public Works Director
Kaitlyn Shaw, Nantucket
Whitney Hall, Waste Options
File: 1910/78240/03/05/01/2016/December 2016
Appendix A
Site Plan
Appendix B
Sampling Results Summary Tables
1910-78240-05-01
Table 1
Nantucket Landfill
Nantucket, Massachusetts
Landfill Gas Sampling Summary - December 2016
Gas Monitoring
Locations Type Date VOCs (ppmv)H2S (ppm)CH4 (% by Vol.) LEL (%)CO2 (%)O2 (%)Barometric
Pressure
(In. Hg)Initial Final Initial Final Initial Final Initial Final Initial Final Initial Final
LGW-1 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 1.4 1.6 19.7 19.4 29.78LGW-2 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 2.7 2.7 18.5 18.3 29.74LGW-3 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 1.0 1.0 20.4 20.4 29.78
LGW-4 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0.6 0.5 19.9 20.3 29.74
LGW-5 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 3.6 3.7 17.7 16.8 29.74LGW-6 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 5.9 8.9 14.4 9.1 29.74LGW-7 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 3.9 3.9 17.6 17.5 29.74
LGW-8 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0.5 0.4 20.5 20.6 29.74
LGW-9 Well 12/12/2016 0.0 0.0 0.0 0.0 0.9 2.7 18 54 0.5 3.8 20.0 17.1 29.72Probe-1 Probe 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 2.2 1.5 19.0 19.8 29.78Probe-2 Probe 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 3.3 3.3 18.0 18.1 29.72Probe-3 Probe 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0.9 0.9 20.2 20.4 29.72
LGW-10 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0.7 0.7 20.1 20.0 29.78
LGW-11 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 5.0 1.6 12.8 18.3 29.78LGW-12 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 1.9 1.9 19.2 19.2 29.74
LGW-13 Well 12/12/2016 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0.0 0.0 20.9 20.9 29.74
Notes:
(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.