HomeMy WebLinkAboutPermit Approval 3/2/2000COMMONWEALTH OF MASSACHUSETTS {
EXECUTIVE OFFICE OF ENVIRONMENTAL AFFAIRS
DEPARTMENT OF ENVIRONMENTAL PROTECTION
20 RIVERSIDE. DRIVE, LAKEVILLE, MA 02347 508-946-2700
ARGEO PAUL CELLUCCI
Governor
JANE SWIFT
Lieutenant Governor -"
March 2, 2000
Mr. Lee Azinheira
Town Engineer
Town Hall
50 West Street
Mansfield, Massachusetts 02048
RE: PERMIT APPROVAL WITH CONDITIONS
Application for: BWPSW25
CORRECTIVE ACTION DESIGN
PERIMETER LANDFIL GAS CONTROL SYSTEM
AT: Mansfield Municipal Landfill
East Street/Route 106
Mansfield, MA
Transmittal Number: W007060
Dear Mr. Azinheira:
BOB DURAND
Secretary
LAUREN A. LISS
Commissioner
The Department of Environmental Protection, Solid Waste Management Section, (the
"Department") has completed its review of a proposed Corrective Action Design ("CAD") for the
Mansfield Municipal Landfill (the "Landfill") located off East Street and found that it is
technically complete. The Department reviewed the CAD pursuant to 310 CMR 19.000 Solid
Waste Management Regulations and the Department's Landfill Technical Guidance Manual (the
"Manual"). The proposed CAD for a perimeter landfill gas control system was submitted by
Camp Dresser and McKee Inc. ("CDM"), on your behalf. The Department approves of the
proposal subject to the conditions herein.
This information is available in alternate format by calling our ADA Coordinator at (617) 574-6872.
DEP on the World Wde Web: http:/Aw .state.ma.us/dep
Q* Printed on Recycled Paper
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Background
On June 1, 1998, the Department issued an approval of a Landfill Major Modification
permit application regarding the Post -Closure Monitoring Plan for the Landfill. Pursuant to
condition 8 of that approval, CDM submitted correspondence on September 3, 1998, detailing a
proposed landfill soil gas survey. On September 15, 1998, CDM notified the Department of
exceedances of 25 per cent of the Lower Explosive Limit (LEL) at the property boundary
detected on September 11, 1998, and proposed an additional soil gas probe investigation. On
September 23, 1998, CDM submitted a formal report with the results of the September 11, 1998
fieldwork.
On November 2, 1998, CDM submitted the results of fieldwork performed on September
17th and 24th, 1998. The results indicated that landfill gas had migrated northward from the
Landfill towards East Street and landfill gas was present at the southern edge of East Street.
Results further indicated that landfill gas was not located in a nearby manhole, nearby
catchbasins, or a surface drainage pipe. Based on the survey results, CDM proposed the
installation of four (4) permanent gas monitoring, wells near the northern Landfill property
boundary along East Street, the utilization of soil gas probes every 500 feet along the Landfill
eastern, southern and western property boundaries, and the determination of appropriate
corrective actions based on the results of a landfill gas survey performed during permanent well
installation. On November 25, 1998 the Department approved the proposed plan.
Application
On July 13, 1999, CDM submitted the application for the CAD to the Department in a
bound document entitled:
"Town, of Mansfield, Massachusetts"
"Landfill Corrective Action Design"
July 1999
The selected CAD includes the construction of a landfill perimeter trench designed to cut-
off the subsurface migration of landfill gas. It is proposed to construct the trench along
approximately 400 feet of the northerly end of the Landfill in the vicinity of the existing
recycling center and adjacent to East Street (Route 106). The trench will be excavated to the
water table or to the point of excavation refusal due to bedrock or other low permeability strata.
The estimated depth of trench is 6 to 15 feet.
A continuous 40-mil High -Density Polyethylene barrier layer will be installed vertically
in the trench from top to bottom against the trench wall furthest from the Landfill. The trench
will be backfilled with screened gravel passing the 5/8-inch sieve and topped by a concrete cap.
Controlled passive venting of the trench will be facilitated by the installation of a 6-inch diameter
horizontal perforated piping system along the entire length of the trench. In four locations the
horizontal pipe will connect to vertical vents which will extend approximately 8-feet above
grade.
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The effectiveness of the landfill gas trench in mitigating landfill gas migration will be
monitored by the installation of temporary soil gas probes spaced approximately 50 feet apart
along the trench. In addition, four existing permanent gas vents located beyond the trench will be
monitored unless the wells interfere with trench installation and are required to be abandoned.
The Department may require the installation of additional permanent gas monitoring wells upon
review of the system as -built plans and the results of initial monitoring.
Venting of landfill gas collected within the trench will be limited to the four vertical
vents. The Town will be required to periodically sample the gas discharge at these locations and
perform an evaluation of the potential for health and safety impacts from the vented gas. In
addition the Town will continue the approved groundwater and landfill gas monitoring programs
for the remainder of the landfill.
Approval
The Department has reviewed the above -referenced proposal and in accordance with the
authority granted pursuant to M.G.L. c.111, s150A and 310 CMR 19.000 hereby approves of the
proposed Corrective Action Design subject to the following conditions:
1. The Department shall be notified at the commencement of construction and provided
with a project schedule such that periodic inspections may be performed.
2. The gas -venting trench shall be installed in accordance with the proposed detail.
There shall be no deviation from the approved detail without prior written approval
by the Department.
3. During the construction process odors, dust, erosion, noise and other nuisance
conditions shall be kept to a minimum. In the event a nuisance condition exists,
abatement measures shall be implemented immediately.
4. Within 30 days of completion of the CAD, a construction certification report shall be
submitted that includes as built drawings of the trench location and construction.
Additionally, quality assurance/quality control data and written certification that the
construction was performed in accordance with the Department's regulations,
requirements, the Manual and the approved design shall be provided in accordance
with 310 CMR 19.151(4). The report and all plans must be signed and sealed by a
registered professional engineer. A site plan showing property boundaries and the
location of significant landfill, recycling center and monitoring program features shall
be sealed by the registered professional engineer and a registered land surveyor.
5. The Town shall continue to take all actions necessary to ensure public health and
safety due to the landfill gas in the vicinity of the recycling center and due to off -site
landfill gas migration including but not limited to:
a) Notification to the Board of Selectmen, Board of Health, Department of Public
Works, Fire Chief, Building Inspector and any other appropriate Board or Town
official and all entities which have utilities on or under East Street of the status of
landfill gas migration and continuing investigation efforts.
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b) All potentially affected buildings and structures shall be monitored on a quarterly
basis, at a minimum.
c) Wherever, there are penetrations of the building foundation, the area in the
immediate vicinity should be screened for combustible gases.
d) All confined spaces within all buildings should be screened for combustible gases.
e) If at any time monitoring detects the presence of any combustible gases at, or in
excess of, 10% of the Lower Explosive Limit at any location within the buildings
or within any utility conduits on -site or off -site, the Town shall notify the
Department's Bureau of Waste Site Cleanup -Emergency Response Section within
two (2) hours of the exceedance as per 310 CMR 40.0321(1)(a) of the regulations.
6. TheTownshall sample and analyze the landfill gas emitted from the most productive
vent at the trench and evaluate the potential for impact to public health and safety.
7. The Town shall continue to perform quarterly gas monitoring (using wells and
probes) pursuant to 310 CMR 19.132(40(b), until otherwise approved by the
Department. As recommended in the Manual, one quarter should be during the winter
when the ground is frozen. Where soil gas probes are utilized between the landfill and
residential areas, the probe spacing should be 100 feet unless it can be demonstrated
that exposed groundwater or wetlands are located between the landfill and any
structures.
8. The Town must undertake all actions necessary to protect public health and safety. It
is the Town's responsibility to comply with all other applicable federal, state, and
local statutes and regulations as a prerequisite to conducting assessment work at the
Landfill.
This Approval has been issued pursuant to M.G.L., Chapter 111, Section 150A. Any
person or persons who are aggrieved by this action may appeal pursuant to Chapter 30A. An
appeal must be commenced no later than thirty (30) days from the date of this Approval. Notice
of an action or proceeding to appeal shall be served on the Department upon the commencement
of the Appeal. In the event of an Appeal, the Department reserves the right to reopen the permit
proceedings, supplement the record and modify the permit. In addition, the Department reserves
the right to require additional assessment, or action as deemed necessary in order to protect and
maintain the environment free from objectionable nuisances, dangers and/or threats to public
health.
This information is available in alternate format by calling our ADA Coordinator at (617)
574-6872. Should you have any questions regarding the above points, or if you need additional
information, please contact me at (508) 946-2884 or Dan Connick at (508) 946-2833 or write to
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the letterhead address. Please refer to Transmittal #W007060 in any correspondence to this
office regarding this Approval.
Solid Waste Management Section
E/DC/cb
cc: Mansfield Board of Selectmen
Town Hall
50 West Street
Mansfield, MA 02048
Mansfield Board of Health
Town Hall
50 West Street
Mansfield, MA 02048
ATTN: Mr. Scott Liete
Camp Dresser & McKee
One Cambridge Place
50 Hampshire Street
Cambridge, MA 02139
ATTN: Mr. Richard Spieler
DEP-Boston
ATTN: J. Doucett