SANBORN | HEAD EXHIBIT A
| 20 Foundry Street
2 Sullding Trust. Engineering Success. Concord, NH 03301
Mr. Jeff Lafleur January 19, 2021
Superintendent File No. 3066.20
Nashua Division of Public Works, Solid Waste Department
840 West Hollis Street Sent via email
Nashua, NH 03062
Re: Change Order Request
General Engineering Services (FY 2021)
City of Nashua Four Hills Landfill
Nashua, New Hampshire
Dear Jeff:
Sanborn, Head & Associates, Inc. (Sanborn Head} appreciates the opportunity to be of
continued service to the City of Nashua (City). As we recently discussed, the extent of
engineering services required by the New Hampshire Department of Environmental Services
(NHDES) related to the City’s groundwater management and air permits in Fiscal Year (FY)
2021 is great that required in years past. Based on the level of effort already provided, we
anticipate exceeding the approved FY 2021 general engineering services budget. This letter
presents our request for a change to the FY 2021 general engineering services budget.
Services Already Provided
Since the beginning of FY 2021, multiple requests were made by the NHDES that are beyond
that of a typical year. Below is a list of the major scope items that were not reflected in our
proposal that have either been completed or are in progress:
« Preparing the Four Hills July 2020 Letter Report;
= Renewing the Old Nashua Groundwater Management Permit (GMP);
=» Managing data associated with the Old Nashua, Shady Lane, and Roussel Park sites;
» Renewing the Shady Lance GMP;
a Renewing the Roussel Park GMP;
a Completing NMOC Tier 2 sampling and preparing the NMOC Tier 2 Test Report;
s Renewing the Four Hills Title V Air Permit;
« Participating in discussions and conference calls related to proposed changes in the
NHDES RTAP regulations; and
m Updating the air dispersion model to include Phase III.
SANBORN, HEAD & ASSOCIATES, INC. wwessanbornhead.coam
