July 15, 2016 Page 2
20160715 Lafleur FY2017 Services Scope.docx 3066.06
=» Address comments from the NHDES related to the 2015 Annual Report for the Four
Hills Landfill; and
=» Prepare the 2016 Annual Report for the Four Hills Landfill to be submitted to the
NHDES in January 2017, as required in the June 15, 2016 Groundwater Management
Permit (GWP-198403099-N-005).
Task3 Annual Waste Capacity Evaluation
Landfills are dynamic and should be surveyed on a regular basis. An annual topographic
survey can be used to calculate the in-place density of the waste mass and identify areas of
the landfill that are not being filled as intended. The survey also provides documentation
of significant changes to the overall site and can be used to evaluate waste settlement over
time.
For this task, Sanborn Head will perform a waste capacity comparison for Phases | and I] of
the Landfill during FY 2017. We understand that the City will retain a licensed surveyor to
prepare a topographic survey the Phases I and II. Our evaluation will include the following:
=» Developing engineering drawings that compare the existing landfill topography (as
provided to us in a recent topographic survey) to the currently permitted final landfill
grades;
s Estimating the remaining disposal capacity (airspace) in terms of cubic yards; and.
= Calculating the remaining life of the permitted landfill capacity based on the City’s
waste projections.
To accomplish the above, Sanborn Head assumes that the City will provide AutoCAD
formatted drawings of the site topography, and that the City will provide recent waste
receipts for Phases I and II.
Sanborn Head will transmit the results of our evaluation in a letter addressed to the City.
Task4 Annual Financial Assurance Update
The NHDES Rules require landfill owners to submit financial assurance updates to NHDES
every third calendar year in order to demonstrate that financial assurance for closure and
long term monitoring and maintenance (LTMM) is provided for the Landfill (Env-Sw 1400).
During the years in which a submittal to NHDES is not required, an updated closure cost
estimate is required to be prepared and kept for the facility’s records. We understand that
the City last submitted an update to NHDES in May 2015, therefore the next submittal to
NHDES will be required in May 2018. The update during FY 2017, to be prepared in May
2017, will be solely for the City’s records.
This financial assurance demonstration includes preparation of opinions of closure and
post-closure cost for the currently permitted areas (Phases I and II) and calculations to
demonstrate that the City is setting aside sufficient funds for future closure and post-
closure needs.
SANBORN Hl HEAD
