31 23 16.26 - Rock Removal.pdf
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- Lancaster County, Pennsylvania
About this file
This is a specification document for rock removal work prepared by Herbert, Rowland & Grubic, Inc., applicable to the Elizabethtown Area Water Authority's Water Main Replacement Project Phase 4 (Contract No. WR-4) in Pennsylvania. The specification establishes technical requirements for removing identified and discovered rock during excavation, defining site rock as solid mineral material exceeding 1/3 cubic yard in volume or material requiring specialized equipment to remove without drilling or blasting. The work encompasses mechanical rock removal using trenchers, hydraulic breakers, rippers, or specialized equipment to break rock to specified lines and grades, excavation of utility trenches to 6 inches below pipe invert elevation and 16 inches wider than pipe diameter, and removal of shaled layers to provide sound bearing surfaces. Contractors must submit shop drawings indicating proposed blasting methods, delay patterns, explosive types, and rock removal methodology, along with survey reports documenting pre-existing conditions of nearby buildings through photographs and condition assessments. The specification requires scheduling to avoid disruption to occupied buildings and mandates visual inspection of bearing surfaces by the Engineer before installing subsequent work.
The document contains no specific pricing terms, quantities, set-asides, or funding information. Rock removal costs are to be incorporated into the overall project bid for the water main replacement work, which includes relocation of approximately 13,860 feet of water main and associated appurtenances and replacement of approximately fifteen fire hydrants. Bids for Contract WR-4 were received online through PennBid until Thursday, August 6, 2026, at 10:00 AM local time. The specification references related sections including Section 31 23 33 for Trenching and Backfilling for Utilities and Section 01 33 00 for submittal procedures, indicating integration within a comprehensive project manual and contract document set.
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Text version
31 23 16.26 – ROCK REMOVAL
Herbert, Rowland & Grubic, Inc. 31 23 16.26 - 1 009280.0426
SECTION 31 23 16.26 – ROCK REMOVAL
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes:
1. Removing identified and discovered rock during excavation.
B. Related Sections:
1. Section 31 23 33 – Trenching and Backfilling for Utilities
1.2 DEFINITIONS
A. Site Rock: Solid mineral material with volume in excess of 1/3 cu yd or solid material that cannot be removed with 3/4 cu yd capacity excavator without drilling or blasting.
B. Trench Rock: Solid mineral material with volume in excess of 1/6 cu yd or solid material that cannot be removed with 1/6 cu yd capacity excavator without drilling or blasting.
1.3 SUBMITTALS
A. Section 01 33 00 – Submittal Procedures: Submittal procedures.
B. Shop Drawings: Indicate proposed method of blasting, delay pattern, explosive types, type of blasting mat or cover, and intended rock removal method.
C. Survey Report: Submit survey report on conditions of buildings near locations of rock removal.
1.4 PROJECT CONDITIONS
A. Conduct survey and document conditions of buildings near locations of rock removal, prior to rock removal, and photograph existing conditions identifying existing irregularities.
1.5 SCHEDULING
A. Schedule Work to avoid disruption to occupied buildings nearby.
PART 2 - PRODUCTS - Not Used
PART 3 - EXECUTION
3.1 EXAMINATION
A. Verify site conditions and note subsurface irregularities affecting Work of this section.
3.2 PREPARATION
A. Identify required lines, levels, contours, and datum.
3.3 ROCK REMOVAL BY MECHANICAL METHOD
A. Excavate and remove rock by mechanical method.
31 23 16.26 – ROCK REMOVAL
Herbert, Rowland & Grubic, Inc. 31 23 16.26 - 2 009280.0426
1. Break rock using trenchers, hydraulic breakers, rippers or other specialized equipment. Break rock to lines and grades shown on the drawings, or as required to complete the work. Finished rock surface should be relatively uniform.
B. Cut away rock at bottom of excavation to form level bearing.
C. Remove shaled layers to provide sound and unshattered base for foundations.
D. In utility trenches, excavate to 6 inches below invert elevation of pipe and 16 inches wider than pipe diameter.
E. Remove excavated materials from site.
F. Correct unauthorized rock removal in accordance with backfilling and compacting requirements of 31 23 33 – Trenching and Backfilling for Utilities.
3.4 FIELD QUALITY CONTROL
A. Section 01 40 00 – Quality Requirements: Field inspecting, testing, adjusting, and balancing.
B. Request visual inspection of bearing surfaces by Engineer and inspection agency before installing subsequent work.
END OF SECTION 31 23 16.26
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