Agenda

3.04. BLASTING RECORDS:

The Contractor shall prepare and submit to the Engineer daily blast reports, including logs of
each blast. Reports shall be submitted to the Engineer no later than the start of the next day's
work. However, during each day of blasting, the Contractor shall review and shall provide
access for the Engineer to review the data from that day's blasting. Reports after each blast
shall include at least the following information for each blast:

Date, time, and location of blast

Permit number and expiration date

2. In excavations for structures, excess excavation in the rock beneath foundations shall be
filled with concrete which shall have a minimum 28-day compressive strength of 3000
psi. Other excess excavation shall be filled with Class B backfill compacted to a
minimum of 92 percent density (ASTM D1557 Method C) as specified under
Section 02300, EARTHWORK.

1.05 SUBMITTALS:

A. At least two weeks before beginning blasting operations, the Contractor shall submit to the
Engineer for record the following data:

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

1.

Name, affiliation, and license number of the person or persons who will be directly

2.
responsible for designing each blast, supervising the loading of the shot, and firing it.

B. Copies of all permits required for blasting.

SECTION 02324

ROCK EXCAVATION AND DISPOSAL

PART1-GENERAL

1.01

1.02

1.03

1.04

A.

B.

WORK INCLUDED:

The Contractor shall excavate rock, if encountered, to the lines and grades indicated on the
drawings 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.

RELATED WORK:

Section 02300, EARTHWORK

Surplus excavated clean material not needed as specified above shall be hauled away
and disposed of by the Contractor at no additional cost to the Owner, to the Nashua
Landfill. Arrangements must be made with the Owner prior to delivery. Disposal
of all rubble shall be in accordance with all applicable local, state and federal
regulations.

END OF SECTION

02300-10

3.04

4. Class B backfill shall be placed from the top of the select backfill to the

specified material at grade (loam, pavement sub-base, etc.). Fill compaction

shall meet the density requirements of this specification.

5. Water Jetting:

a. Water jetting may be used when the backfill material contains less than
10 percent passing the number 200 sieve, but shall be used only if
approved by the Engineer.

The Engineer reserves the right to test backfill for conformance to the
specifications and Contractor shall assist as required to obtain the information.
Compaction testing will be performed by the Engineer or by an inspection
laboratory designated by the Engineer, engaged and paid for by the Contractor.
If test results indicate work does not conform to specification requirements, the
Contractor shall remove or correct the defective Work by re-compacting where
appropriate or replacing as necessary and approved by the Engineer, to bring

2.

After the excavation has been made, and before forms are set for footings, mats,
slabs, or other structures, and before reinforcing is placed, all loose or
disturbed material shall be removed from the sub-grade. The bearing surface
shall then be compacted to meet the requirements of this specification.

In all excavation areas, the Contractor shall strip the surface topsoil layer and
underlying subsoil layer separate from underlying soils. In paved areas, the
Contractor shall first cut pavement as specified in paragraph 3.02 B.1 of this
specification, strip pavement and pavement sub-base separately from
underlying soils. All excavated materials shall be stockpiled separately from
each other within the limits of work.

2. The gradation shall meet the following requirements:

Sieve Designation Percentage Passing
3 in. 100

2 in. 95 — 100

1 in. 55-85

No. 4 27-52

No. 200 0-12