September 2, 2016 Page 4
20160902 Nashua Ph III proposal.docx
the time the PMAs are submitted, and, as such, we did not include the fees in our budget
estimate.
Task 3 Hydrogeologic Services
According to the 1992 Solid Waste Facility Permit, as part of the final design of Phase III,
the Type II PMA is to include documentation of the elevation of the groundwater table
beneath the Phase III area. Specifically, piezometers need to be installed in the Phase III
area to evaluate the groundwater elevation with respect to the overall landfill liner system
design and the requirements of the NHDES solid waste rules. As noted in the permit, a
detailed work plan is to be prepared and submitted to NHDES for approval prior to
installing the piezometers. As part of the work plan preparation, Sanborn Head proposes
to visit the Phase III area to observe the existing topography and, if feasible, assess the
condition of groundwater monitoring wells that may be in the area. Using the information
from the site visit and the design intent for the liner system, Sanborn Head will prepare a
work plan, which will include a site map indicating the proposed piezometer locations with
respect to the proposed liner design. A draft work plan will be submitted to the City for
review and comment. Once the work plan is finalized, Sanborn Head will provide the City
with paper and pdf versions for submission to the NHDES. We anticipate addressing one
round of NHDES review comments. Once the work plan is approved by NHDES, Sanborn
Head will mark out the piezometer locations, contact DigSafe, retain a driller, supervise and
log the piezometer installation (including sampling of the soils encountered), and retain a
licensed professional land surveyor to locate the piezometers. Sanborn Head will select
representative soil samples for geotechnical laboratory testing. The information from
these activities will be summarized in a report. A draft report will be submitted to the City
for review and comment. Once the report is finalized, Sanborn Head will include it with the
Type II PMA.
Task 4 AoT Permit Application
Consistent with other land disturbing construction projects at the Four Hills Landfill, an
AoT permit application will be prepared along with the Type II PMA. Sanborn Head will
prepare the AOT permit application form and supporting documentation, including: (i) a
narrative describing the proposed stormwater management system and associated erosion
and sedimentation control features; (ii) an evaluation of the existing and proposed
hydrology; (iii) pre- and post-development runoff models and relevant design calculations
supporting the selection of proposed BMPs; and (iv) support figures illustrating the
evaluation and proposed design.
The application and supporting documents will be prepared in accordance with the
requirements of the AoT Rules (Env-Ws 1500) and will be signed and sealed by a
Professional Engineer licensed to practice in the State of New Hampshire. Our services will
also include reproducing the application and supporting information as a package to be
submitted to the NHDES. One hard copy and one electronic copy of the application will be
submitted to the NHDES, and one hard copy will be provided to the City.
SANBORN ||| HEAD
