September 10, 2021 Page 5
20210910 Bridge St E Hollis St Nashua Sanborn Head Amend 1.docx 4381.00
Soil samples from the test borings will be submitted for geotechnical laboratory testing as
follows:
= Grain size analysis (ASTM D6913) - 3 samples;
m» Standard Proctor moisture/density test (ASTM D698) - 1 sample; and,
» California Bearing Ratio (CBR) test (ASTM D1883) - 1 sample.
Task FD5 - Geotechnical Engineering and Report
Sanborn Head will prepare a geotechnical engineering report that summarizes the
subsurface exploration, subsurface conditions encountered, and our recommendations for
foundation design and earthwork construction. The geotechnical engineering report will
include an exploration location plan, logs of test borings, and laboratory testing reports.
The narrative of the report will include:
=» Description of the existing site conditions and proposed project;
= Description of subsurface conditions encountered during the explorations;
=» Foundation type and net allowable bearing capacity for mast arm foundations;
=» Pavement design recommendations;
= Design soil infiltration rate;
= Slope design criteria for cut and fill slopes;
=» An evaluation of the need for temporary dewatering (if any);
=» Segmental retaining wall design criteria for use by third party wall designers, and
» Earthwork procedures including fill material specifications and compaction
requirements.
Task FD6 - Meetings
We included an allowance for three meetings to be attended by the Sanborn Head
Principal-in-Charge or our Project Manager at the offices of McFarland Johnson in Concord,
NH during the Final Design phase.
Construction Documents and Bid Assistance
We will assist McFarland Johnson in the preparation of project specifications and
environmental pay items as follows.
Task CD1 - Special Provision Specifications and Pay Items
We assume that Sanborn Head will prepare the following Special Provision specifications
as needed to amend the NHDOT Standard Specifications for Road and Bridge Construction:
=» Prosecution of Work (as it relates to environmental soil management);
=» Soil Management Plan (project-specific revisions to NHDOT Generic SMP);
s Item 203.38 - Excavation and Off-Site Disposal of Asbestos-Contaminated Soil;
s Item 697.21 - Health and Safety Plan; and
SANBORN HEAD
