SANBORN HEAD 20 Foundry Street
Building Trust. Engineering Success. Concord, NH 03301
Mr. Jeff Lafleur April 7, 2021
Solid Waste Superintendent
Nashua Division of Public Works, Solid Waste Department
840 West Hollis Street
Nashua, NH 03062
Re: — Revised Proposal for Design and Permitting Services
Phase III Stage 2
Four Hills Landfill
Nashua, New Hampshire
Dear Jeff:
Sanborn, Head & Associates, Inc. (Sanborn Head) is pleased to provide the City of Nashua
(City) with this proposal to provide design and permitting services associated with the Phase
II] Stage 2 expansion at the Four Hills Landfill in Nashua, New Hampshire. As you are aware,
the City received permit approval for Phase II] on December 5, 2018 from the New
Hampshire Department of Environmental Services (NHDES). The approval included several
conditions related to Stages 1 and 2 of the proposed design. Sanborn Head worked with the
City to meet the Stage 1-specific permit conditions to complete construction and obtain
operating approval of the new phase. Now that Stage 1 is operational, the City requested that
Sanborn Head prepare a proposal to satisfy the Stage 2 conditions.
For clarity, the permit conditions included in the December 5, 2018 NHDES approval letter
specific to the design and permitting of Phase II] Stage 2 are reproduced below:
(10) Prior to filing the notice of intent to construct for Phase III Stage 2, the permittee shall
obtain approval from NHDES of final design plans submitted in accordance with Env-Sw 315.
The final design plans shall be prepared based on the approved preliminary plans identified in
Condition (7)(a), with the following changes and additional information:
(a) Revised design calculations, and construction documents as appropriate, for the
zigzag liner anchor trench design based on ultimate settlement;
(b) Revised construction documents to include the following:
1. Design details for transition from the zigzag liner to Phase II; and
2. Design details and other construction drawings as needed to show how the
zigzag liner system and associated landfill components will be constructed at the
reflex angles between Phase II and Phase III.
(c) A zigzag liner inspection, monitoring and maintenance plan, to be appended to both
the operating plan and closure plan in accordance with Conditions (18) and (19) herein,
that includes:
1. Protection protocols during construction and filling operations;
2. Inspection and testing protocols prior to causing any part of the zigzag liner
system to become inaccessible for inspection and repair;
SANBORN, HEAD & ASSOCIATES, INC. www.sanbornhead.com
