42-Sec 31 23 16.26 - ROCK REMOVAL.pdf
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- Attached to
- Heritage Hills WWTP Discharge Interconnection, Contract No. 6715-11 State and local contract opportunity
- Solicitation number
- Not on record
- Issued by
- Bucks County, Pennsylvania
About this file
This is a technical specification document for rock removal work as part of Upper Makefield Township's 2026 Road Program in Pennsylvania. The specification outlines the scope of work for removing identified and discovered rock during excavation activities, including the use of mechanical methods to assist with rock removal. Rock is defined as solid mineral material weighing a minimum of 70,000 pounds that cannot be removed with standard heavy equipment without drilling, wedging, blasting, or mechanical surface impact equipment. The work includes excavation and removal by mechanical methods such as drilling holes and utilizing expansive tools, wedges, and mechanical disintegration compounds to fracture rock. Special requirements apply to rock excavation within ten feet of underground utilities or structures, which must be performed by hand with utmost care, and in areas with high tension power lines. Paving within roads must be pre-cut before blasting to prevent heaving beyond normal trench width. For utility trenches, excavation must extend six inches below the invert elevation of pipe and extend 12-16 inches wider than the pipe's outside diameter with a minimum of six inches on each side. The contractor must obtain all required permits from local and state agencies and comply with all permit conditions, including timely notifications.
The specification references the National Fire Protection Association's NFPA 495 Code for Manufacture, Transportation, Storage, and Use of Explosive Materials as the applicable standard. A seismic monitoring firm with five years of documented experience in seismic surveys is required. Shattered or fractured rock may be allowed as trench backfill where native backfill material is permitted, provided size requirements are met; otherwise, excavated rock must be removed from the site. All trench bottoms, foundation bearing surfaces, and cavities formed by removed rock must be visually inspected by the Resident Project Representative prior to further construction. The contractor must schedule work to avoid disruption to nearby occupied buildings and submit a construction progress schedule in accordance with applicable provisions.
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Text version
ROCK REMOVAL
31 23 16.26-1
SECTION 31 23 16.26
PART 1 GENERAL
1.01 SECTION DESCRIPTION:
A. The Work of This Section Includes:
1. Removal of identified and discovered rock during excavation.
2. Mechanical methods to assist rock removal.
1.02 RELATED INFORMATION
A. Related Work Specified Elsewhere:
1. Section 31 20 00: Earthwork
2. Section 31 23 33: Excavation, Backfill & Compaction
1.03 QUALITY ASSURANCE
A. Reference Standards:
1. National Fire Protection Association (NFPA): NFPA 495 - Code for Manufacture, Transportation, Storage, and Use of Explosive Materials
B. Seismic Monitoring Firm: Company specializing in seismic surveys with five (5) years documented experience.
1.04 DEFINITIONS
A. Rock: Solid mineral material of a size that cannot be removed with a "Trac-Hoe" style machine with a minimum weight of 70,000 pounds (without use of drilling and wedging, blasting, and/or mechanical surface impact equipment).
1.05 REGULATORY REQUIREMENTS
A. Obtain all required permits from various local and/or State agencies among which are those noted in Items B, C and D of Paragraph 1.23 of the Supplementary Conditions (Document 00 73 00).
B. Comply with all permit conditions including timely notifications to all required agencies/officials.
1.06 PROJECT CONDITIONS
A. Rock excavation within ten (10) feet of underground utilities or structures shall be done by hand with exercise of utmost care to avoid disturbance.
B. Special care shall be exercised in areas where high tension power lines are located.
C. Paving shall be pre-cut before blasting within roads to prevent paving from heaving beyond normal trench width.
31 23 16.26-2
1.07 SCHEDULING
A. Schedule Work under the provisions of Section 01 33 00 concerning the submittal for a Construction Progress Schedule.
B. Schedule Work to avoid disruption to occupied buildings nearby.
PART 2 PRODUCTS
Section not used.
PART 3 EXECUTION
3.01 EXAMINATION
A. Verify site conditions and note subsurface irregularities affecting work of this section.
3.02 PREPARATION
A. Identify required lines, levels, contours, and datum.
3.03 ROCK REMOVAL BY A MECHANICAL METHOD
A. Excavate and remove rock by the mechanical method.
B. Drill holes and utilize expansive tools, wedges, and/or mechanical disintegration compound to fracture rock.
C. Cut away rock at bottom of excavation to form level bearing.
D. Remove shaled layers to provide sound and unshattered base for footings and foundations.
E. In utility trenches, excavate to 6 inches below invert elevation of pipe and 12-16 inches wider than pipe outside diameter (minimum 6 inches on each side).
F. Shattered or fractured rock may be allowed by Owner as trench backfill where native backfill material is permitted provided that the size requirement in Section 31 23 33 (Item 2.03) is achieved. Otherwise, excavated rock must be removed from site.
G. Correct unrequired rock removal in accordance with the requirements of Section 31 23 33.
3.04 FIELD QUALITY CONTROL
A. Contractor shall provide for visual inspection by Resident Project Representative all trench bottoms, foundation bearing surfaces and cavities formed by removed rock prior to further construction.
END OF SECTION
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