HomeMy WebLinkAbout2016-01 Nantucket Landfill- Quarterly Landfill Gas Monitoring Report
REPORT
Summary of Landfill Gas
Sampling Results
Nantucket Landfill
Nantucket, Massachusetts
January 2016
75 State Street, Suite 701
Boston, Massachusetts 02109
tel: 617 452-6000
February 10, 2016
Mr. Mark Dakers
Massachusetts Department of Environmental Protection
Southeast Regional Office
20 Riverside Drive
Lakeville, Massachusetts 02347
Subject: Summary of Landfill Gas Sampling
January 2016
Nantucket Landfill
Nantucket, Massachusetts
Dear Mr. Dakers:
On January 22, 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 and temporary probe
#1. Final concentrations were 7.6% and 41.5% by volume, equivalent to 152% and 830% of
the LEL, respectively. Probe #2 and #3 both had methane detections but were under the
regulatory limit of 25% of the LEL at the property boundary. This exceedance was reported
within the required 24-hour time period. Appendix C contains a copy of the notification made
to MassDEP on January 22, 2016.
Carbon dioxide was detected in all monitoring locations except for LGW-13 with final
concentrations ranging from 0.1% to 21.3%.
Oxygen was detected in all monitoring locations at final concentrations between 0.5% and
20.9%.
Mr. Mark Dakers
February 12, 2014
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.
In correspondence dated May 9, 2012, CDM Smith requested eliminating sampling from gas wells
LGW-14 through LGW-18, as these gas wells are located between two landfill cells and no longer
monitors the soil gas concentrations at a compliance boundary.
The next quarterly sampling round is scheduled for April 2016.
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: Kara Buzanoski, Nantucket
Tara Reilly, Nantucket
Whitney Hall, Waste Options
File: 1910/78240/03/05/01/2016/January 2016
Appendix A
Site Plan
Appendix B
Sampling Results Summary Tables
Table 1 Nantucket LandfillNantucket, MassachusettsLandfill Gas Sampling Summary - January 2016 LEL (%)Initial Final Initial Final Initial Final Initial Final Initial Final Initial FinalLGW-1Well1/22/20160.00.00.00.00.00.0001.41.420.120.630.28LGW-2Well1/22/20160.00.00.00.00.00.0002.42.419.419.230.28LGW-3Well1/22/20160.00.00.00.00.00.0001.11.120.620.630.28LGW-4Well1/22/20160.00.00.00.00.00.0001.10.120.920.930.28LGW-5Well1/22/20160.00.00.00.00.00.0005.35.414.412.430.25LGW-6Well1/22/20160.00.00.00.00.00.00010.410.96.04.130.25LGW-7Well1/22/20160.00.00.00.00.00.0003.43.518.016.930.28LGW-8Well1/22/20160.00.00.00.00.00.0000.10.020.820.930.25LGW-9Well1/22/20160.00.00.00.011.07.62201528.47.414.06.430.25Probe-1Probe1/22/20160.00.00.00.042.741.585483021.421.30.20.530.25Probe-2Probe1/22/20160.00.00.00.00.50.510106.76.811.011.030.25Probe-3Probe1/22/20160.00.00.00.00.20.1421.10.919.719.930.25LGW-10Well1/22/20160.00.00.00.00.00.0000.60.620.620.730.28LGW-11Well1/22/20160.00.00.00.00.00.0000.20.120.820.930.28LGW-12Well1/22/20160.00.00.00.00.00.0001.71.819.819.730.28LGW-13Well1/22/20160.00.00.00.00.00.0000.00.020.920.930.28Notes: (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.Gas Monitoring LocationsH2S (ppm) CH4 (% by Vol.) CO2 (%)Barometric Pressure (In. Hg)O2 (%)VOCs (ppmv)Type Date 1910-78240-05-01
Appendix C
Landfill Gas Notification to MassDEP
1
Sandahl, Adam J.
From:Dudley, Emily
Sent:Tuesday, February 23, 2016 11:45 AM
To:Sandahl, Adam J.
Subject:FW: 24-hour Landfill Gas Notification - Nantucket Landfill, Nantucket
Attachments:Nantucket Landfill Environmental Monitoring Plan 3-13-13.pdf
From: Dudley, Emily
Sent: Friday, January 22, 2016 3:37 PM
To: Mark.Dakers@State.MA.US
Cc: 'kbuzanoski@nantucket-ma.gov' <kbuzanoski@nantucket-ma.gov>; Mancini, Mary <ManciniMC@cdmsmith.com>
Subject: 24-hour Landfill Gas Notification - Nantucket Landfill, Nantucket
Mark,
In accordance with 310 CMR 19.132 (4) (h), CDM on behalf of the Town of Nantucket notifies MassDEP that during
landfill gas sampling today, January 22, 2016 the concentration of methane gas exceeded 25% of the Lower Explosive
Limit (LEL) at one landfill gas well and one temporary probe located to the south-east of the landfill site. The percent of
the LEL by volume detected at this location is as follows:
LGW-9 152% LEL
Probe#1 830% 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. An additional probe, Probe #1 was conducted closer to the road and fence line, approximately 6-8
feet away from LGW-9. Gas was detected in this probe at a higher concentration than LGW-9. Two additional probes
were conducted at 10-15 foot intervals away from Probe #1; gas was detected at low concentrations in these additional
probes. These results are consistent with previous sampling rounds, as methane in this area correlates to the size and
proximity of the adjacent compost pile, which has grown since the last monitoring event. In addition, the berm along the
compost pile access point has grown since the last sampling event which may be preventing the migration of gas from
LGW-9 back towards the landfill, which could explain the higher concentration of methane found in Probe #1. We do
not believe the methane detected 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 me if you have any questions or require any additional information.
Thank you,
Emily P. Dudley | CDM Smith | 75 State Street, Suite 701 | Boston, MA 02109 | T/F: 617.452.6616 | cdmsmith.com