Agenda

Figure

FINAL DESIGN CONSTRUCTION MONITORING

granular fill material would require that the excavation be sufficiently sloped to conform to
OSHA Guidelines Title 29 CFR Subpart P 1926.650. Considering the site constraints, a shoring
system may be required where an open excavation is impractical.

The following Table summarizes the required mast arm foundation sizes for spread footing and
drilled pier foundation alternatives:

Recommended Foundations Types

APPROXIMATE THICKNESSES OF STRATIGRAPHIC UNITS PENETRATED
AND DEPTH TO AUGER REFUSAL AT B-1

STRATIGRAPHIC UNIT B-1 P-1
Topsoil Layer 0.2 ft. -
Fill Layer 2.8 ft. -
Old Topsoil Layer 0.25 ft. -
Subsoil Layer 0.75 ft. -
Sand and Gravel Layer 4.5 ft. -
Auger Refusal 8.5 8.5
Note:

1. Samples were not collected during the advancement of test probe P-1. This probe was
advanced to confirm the depth to auger refusal encountered at B-1.

Groundwater Conditions

Topsoil Layer

A 2 inch thick topsoil layer was observed at test boring B-1. The topsoil layer consists of dark
brown to grey, dry, loose, silt and very fine sand with abundant roots. A trace amount of fine
gravel was noted.

Fill Layer

2. Perform Standard Penetration Tests (SPTs) to estimate relative density and cohesive
consistency of the in-situ soil units;

3. Estimate the engineering properties of the subsurface strata for geotechnical engineering
analyses; and

4. Determine the depths to competent soil and/or auger refusal, and the depth to the
groundwater table.

e Google Earth recent aerial photographs depicting existing conditions at the site and
surrounds;

e Surficial Geology of the Nashua South Quadrangle, New Hampshire;
e USGS 7.5 Minute Series Nashua South Quadrangle, New Hampshire; and

e Geologic Map of the Nashua South Quadrangle, Hillsborough County, New Hampshire
and Middlesex County, Massachusetts.

Existing Conditions

‘V4 MILLER ENGINEERING & TESTING INC.

GEOTECHNICAL / SOIL BORINGS / ENVIRONMENTAL / SOILS / CONCRETE / MASONRY / STEEL / ROOFING / ASPHALT INSPECTION
Mail all correspondence to: 100 SHEFFIELD ROAD - PO BOX 4776 - MANCHESTER, NH 03108-4776 - TELEPHONE (603)668-6016 - Fax (603)668-8641

September 2, 2016

Mr. John F. Osorio
Greenman-Pedersen, Inc.

181 Ballardvale Street, Suite 202
Wilmington, MA 01887

3.17.3 Drawings, manufacturer's specifications, and applicable catalog cuts for all materials and components shall
be submitted in accordance with Section 105.02 of NHDOT Standard Specifications within 21 days after award of the
contract. An additional set of final approved documents, to total 6 sets, shall be supplied to the Engineer.

Add Section 3.18 to read as follows:

Section 2.2, Traffic Signal Heads, amend to include the following:

Signal heads shall be rigid mounted on mast arms, with the bottom of all signals at the same height. All traffic signal
ienses shall be 12” in diameter uniess otherwise noied on the plans.

Signal heads shall be made of aluminum and conform to Materials Section 2.2 of Section 616 of the NHDOT Standard
Specifications.

Section 2.4.1.2; revise in its entirety to read as follows: