SANBORN |
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| HEAD
Building Trust. Engineering Success.
;
Mr. Jeff Lafleur April 21, 2016
Superintendent File No. 3066.06
Nashua Division of Public Works, Solid Waste Department
840 West Hollis Street Sent via emaili
Nashua, NH 03062
Re: Additional GCCS Related Services
City of Nashua Four Hills Landfill
Nashua, New Hampshire
Dear Jeff:
Sanborn, Head & Associates, Inc. (Sanborn Head) appreciates the opportunity to revise our
proposed scope of engineering services to the City of Nashua (City) relative to the Four
Hills Landfill. The scope of services presented herein is based on communication with the
City regarding additional gas collection and control system (GCCS) related services to be
completed by Sanborn Head for the City during FY 2016 and FY 2017,
Task 1 Phases | and 11 GCCS Assessment
For this task, Sanborn Head will perform an assessment of the condition and operation of
the GCCS in the closed, unlined landfill as well as Phases | and I] of the active, lined landfill.
The assessment will include the following:
e Using LFGMS, Sanborn Head will review recent wellfield data collected by the City;
= Schedule a two-day site visit to meet with City personnel to better understand current
on-site GCCS monitoring practices and procedures. As part of the site visit, we would
perform:
o A visual inspection of GCCS components (eg. wellheads/ports, boot seals,
lateral/vacuum lines, etc.);
o A landfill cover integrity assessment;
ao Gas well monitoring/data collection as necessary after initial wellfield data review;
and
o GCCS and landfill cover surface emissions monitoring at locations identified during
wellfield data review and site visit;
« Review data collected during the site visit; and
= Prepare a GCCS assessment report. The report will summarize our findings and present
our recommendations for corrective actions to improve wellfield performance.
SANBORN, HEAD @ ASSOCIATES, INC. www.sanbornhead.com
