Board Of Aldermen

SECTION

2022 Sewer Replacement Project Rock Structure Excavation and Disposal
Nashua, NH 02324-5

« Distance and direction of recording station from the area of detonation

= Date and exact time of reading

" Type of ground at recording station

= Peak particle velocity for all components as well as resultant for all
frequencies of vibrations

" Duration of motion with a velocity in excess of one thousandth of an inch
per second. A copy of the photographic record of seismograph readings
Peak air blast level.

3.04 BLASTING RECORDS:

B. Work damaged by blasting shall be repaired or replaced at the Contractor's expense.

B. Ifrock 1s excavated beyond the limits of payment as specified, or authorized in writing
by the Engineer, the excess excavation, whether resulting from over-breakage or other
causes, shall be backfilled, by and at the expense of the Contractor, as specified below:

B. The Contractor shall procure all permits required for blasting.

1.05 SUBMITTALS:
A. At least two weeks before beginning blasting operations, the Contractor shall submit
to the

Engineer for record the following data:

1. Name of Contractor or Subcontractor responsible for blasting and
monitoring operations and license number.

2. Name, affiliation, and license number of the person or persons who will be
directly responsible for designing each blast, supervising the loading of the
shot, and firing it.

SECTION
02324

ROCK STRUCTURE
EXCAVATION AND DISPOSAL

PARTI-GENERAL

1.01 WORK INCLUDED:
The Contractor shall excavate rock, if encountered, to the lines and grades indicated in
the specifications or as directed, shall dispose of the excavated material, and shall
furnish the required material as specified in Section 02300 EARTHWORK for backfill
in place of the excavated rock.

1.02 RELATED WORK:
A. Section 02300, EARTHWORK
B. Section 02252, SUPPORT OF
EXCAVATION

1.03 DEFINITIONS:

to meet the requirements of this specification.

2. Contractor shall use extra care when compacting adjacent to pipes and drainage
structures. Backfill and compaction shall proceed along sides of drainage
structures so that the difference in top of fill level on any side of the structure
shall not exceed two feet (2') at any stage of construction.

B. TRENCHES:

1.

Qo

Bedding as detailed and specified shall be furnished and installed beneath the

pipeline prior to placement of the pipeline. A minimum bedding thickness shall

be maintained between the pipe and undisturbed material, as shown on the

Drawings.

As soon as practicable after pipes have been laid, backfilling shall be started.

Unless otherwise indicated on the Drawings, select backfill shall be placed by

hand shovel in 6-inch thick lifts up to a minimum level of 12-inches above the

3.03 BACKFILL PLACEMENT AND COMPACTION:

A. GENERAL:

1.

2.

material remaining in the bottom of the trench 1s not disturbed.

If pipe is to be laid in embankments or other recently filled areas, the fill
material shall first be placed to a height of at least 12-inches above the top of
the pipe before excavation.

Pipe trenches shall be made as narrow as practicable and shall not be widened
by scraping or loosening materials from the sides. Every effort shall be made to
keep the sides of the trenches firm and undisturbed until backfilling has been
completed.

specified densities

3.02 EXCAVATION:

A. GENERAL:

1.

2.

The Contractor shall perform all work of any nature and description required to
accomplish the work as shown on the Drawings and as specified.