June 13, 2017 Page 2
20170613 Lafleur FY2018 Services Scape.docx 3066.08
x Preparing the 2017 Annual Report for the Four Hills Landfill to be submitted to the
NHDES in January 2018, as required in the June 15, 2016 Groundwater Management
Permit (GWP-198403099-N-005),
Task3 Annual Waste Capacity Evaluation
For this task, Sanborn Head will perform a waste capacity comparison for Phases I and II of
the Landfill during FY 2018. We understand that the City will retain a licensed surveyor to
prepare a topographic survey of Phases | 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;
n Estimating the remaining disposal capacity (airspace) in terms of cubic yards; and
« Calculating the remaining life of the permitted landfill based on the remaining capacity
and the City’s projected waste acceptance rate.
To accomplish the above, Sanborn Head assumes that the City will provide AutoCAD
formatted drawings of the site topography, as well as recent waste receipts, 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 2018, to be prepared in May
2018, will need to be submitted toe the NHDES.
This financial assurance demonstration includes preparation of opinions of closure and
post-closure cost for the currently permitted areas (Phases | and II) and calculations to
demonstrate that the City is setting aside sufficient funds for future closure and post-
closure needs.
Sanborn Head will prepare the opinions of cost using the required NHDES forms based on
the permitted closure plan, currently available average unit costs for similar projects,
current costs for monitoring services, published construction cost estimating guides, and
our engineering judgment, We will estimate the remaining life of Phases [ and II based on
the latest survey update, and prepare sinking fund calculations using account balances
provided to us, actual waste tonnage received at the Landfill, and the projected waste
tonnage for the remaining estimated life of Phases | and If. The calculations will
demonstrate that the balances for the closure and LTMM accounts are consistent with what
was projected or provide amounts per ton that should be set aside going forward to
provide sufficient funds at the expected date of closure.
SANBORN I HEAD
