31 23 16.26 - Rock Removal.pdf
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- Attached to
- West Pump Station Replacement Project
- Solicitation number
- Not on record
- Issued by
- Chester County, Pennsylvania
About this file
This is a technical specification document for rock removal procedures related to the West Pump Station Replacement Project in Pennsylvania, managed by Northwestern Chester County Municipal Authority. The specification outlines the removal of identified and discovered rock during excavation operations, including site rock and trench rock materials that exceed defined volume thresholds or cannot be removed with standard excavation equipment without drilling or blasting. The work involves mechanical excavation methods, cutting rock at excavation bottoms to form level bearing surfaces, removing shaled layers to ensure sound foundations, and completing utility trench excavation to six inches below invert elevation and 24 inches wider than pipe diameter. All excavated materials must be removed from the site, and unauthorized rock removal must be corrected in accordance with backfilling and compacting requirements. The specification requires documentation of existing building conditions near rock removal locations through survey reports and photographs prior to work commencement, with scheduling designed to avoid disruption to occupied nearby buildings. Visual inspection of foundation bearing surfaces by the Engineer and inspection agency is mandated before subsequent work installation.
The specification references industry standards including NFPA 495 Explosive Materials Code and cross-references related construction sections covering rough grading, excavation, trenching, and fill materials. Submittal procedures are required per Section 01 33 00, and field quality control provisions are established under Section 01 40 00. The specification does not contain pricing information, set-asides, incumbent details, or contract term specifics, as it functions as a technical execution standard within the broader West Pump Station Replacement Project bid package that includes three separate contracts for general construction, electrical construction, and mechanical construction, with lump sum bidding required.
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Text version
31 23 16.26 – ROCK REMOVAL
Herbert, Rowland & Grubic, Inc. 31 23 16.26 - 1 000483.0450
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 22 13 – Rough Grading.
2. Section 31 23 16 – Excavation: Building excavation.
3. Section 31 23 16.13 – Trenching: Trenching and backfilling for utilities.
4. Section 31 23 23 – Fill: Backfill materials.
1.2 REFERENCES
A. National Fire Protection Association:
1. NFPA 495 - Explosive Materials Code.
1.3 DEFINITIONS
A. Site Rock: Solid mineral material with volume in excess of 1/3 cu yd or solid material that cannot be removed with ¾ 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 ¾ cu yd capacity excavator without drilling or blasting.
1.4 SUBMITTALS
A. Section 01 33 00 – Submittal Procedures: Submittal procedures.
B. Survey Report: Submit survey report on conditions of buildings near locations of rock removal.
1.5 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.
1.6 SCHEDULING
A. Section 01 31 13 – Project Coordination: Coordination and project conditions.
B. Schedule Work to avoid disruption to occupied buildings nearby.
31 23 16.26 – ROCK REMOVAL
Herbert, Rowland & Grubic, Inc. 31 23 16.26 - 2 000483.0450
PART 2 - PRODUCTS
PART 3 - EXECUTION
3.1 EXAMINATION
A. Section 01 31 13 – Project Coordination: Coordination and project conditions.
B. 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.
B. Cut away rock at bottom of excavation to form level bearing.
C. Remove shaled layers to provide sound and un-shattered base for foundations.
D. In utility trenches, excavate to 6 inches below invert elevation of pipe and 24 inches wider than pipe diameter.
E. Remove excavated materials from site.
F. Correct unauthorized rock removal in accordance with backfilling and compacting requirements of Section 31 23 23, as directed by Engineer.
3.4 FIELD QUALITY CONTROL
A. Section 01 40 00 – Quality Requirements: Field inspecting, testing, adjusting, and balancing.
B. Request visual inspection of foundation bearing surfaces by Engineer and inspection agency before installing subsequent work.
END OF SECTION 31 23 16.26
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