SECTION 02202

ROCK REMOVAL

PART 1 GENERAL

SECTION INCLUDES

Removal of [identified] [discovered] rock during excavation.

[Expansive tools] [Explosives] to assist rock removal.

RELATED SECTIONS

Document 00200 - Information Available to Bidders: Soil investigation report; bore hole locations and findings of subsurface materials.

[Document] [Section] [______-____________]: Unit prices for rock removal work.

Section 01400 - Quality Control:	Inspection of bearing surfaces.

Section 02211 - Rough Grading.

Section 02222 - Excavation: Building excavation.

Section 02223 - Backfilling: Backfill materials.

Section 02225 - Trenching: Trenching and backfilling for utilities.

UNIT PRICES

Rock Quantity: Determined by quantity of rock indicated in the Contract Documents.

Adjustments in Contract Price will be made due to changes in quantity of rock, based on unit prices established in the Agreement for rock removal.

Determination of Unit Measurements: [Identified by site measurements and verified by the Architect/Engineer] [________________].

REFERENCES

NFPA 495 - Code for Explosive Materials.

DEFINITIONS

Site Rock: Solid mineral material with a volume in excess of [1/3] [____] cu yd ([0.25] [____] cu m) or solid material that cannot be removed with a [3/4] [____] cu yd ([0.57] [____] cu m) capacity power shovel [without drilling or blasting].

****** [OR] ******

Trench Rock:	Solid mineral material with a volume in excess of [1/6] [____] cu yd ([0.13] [____] cu m) or solid material that cannot be removed with a backhoe [without drilling or blasting].

****** [OR] ******

Rock: Solid mineral material of a size that cannot be removed with a [____] cu yd ([____] cu m) capacity power shovel.

SUBMITTALS

Submit under provisions of Section [01300] [________].

Shop Drawings: Indicate the proposed method of blasting, delay pattern, explosive types, type of blasting mat or cover, and intended rock removal method.

QUALIFICATIONS

Seismic Survey Firm:	Company specializing in seismic surveys with [five] [____] years [documented] experience.

Explosives Firm:	Company specializing in explosives for disintegration of rock, with [five] [____] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to [applicable] [___________] code for explosive disintegration of rock [and to NFPA 495 for handling explosive materials].

Obtain permits from authorities having jurisdiction before explosives are brought to site or drilling is started.

SCHEDULING

Schedule work under the provisions of Section [01300] [________].

Schedule Work to avoid [working hours of] [disruption to] occupied buildings nearby.

PART 2 PRODUCTS

MATERIALS

Explosives: Type recommended by explosive firm following seismic survey [and required by authorities having jurisdiction].

Delay Device: [Type recommended by explosive firm] [________________].

Blast Mat Materials:	[Type recommended by explosives firm] [________________].

PART 3 EXECUTION

EXAMINATION

Verify site conditions under provisions of Section [01039] [________].

Verify site conditions and note subsurface irregularities affecting work of this Section.

PREPARATION

Identify required lines, levels, contours, and datum.

Conduct survey and document conditions of buildings near locations of rock removal [and prior to blasting, photograph existing conditions identifying existing irregularities].

ROCK REMOVAL - MECHANICAL METHOD

Excavate and remove rock by the mechanical method. [Drill holes and utilize [expansive tools] [wedges] to fracture rock.]

Cut away rock at bottom of excavation to form level bearing.

Remove shaled layers to provide sound and unshattered base for [footings] [foundations] [________].

In utility trenches, excavate to [6] [____] inches ([150] [____] mm) below invert elevation of pipe and [24] [____] inches ([600] [____] mm) wider than pipe diameter.

Remove excavated materials [from site] [and reuse for site landscaping] [________________].

Correct unauthorized rock removal in accordance with [backfilling and compaction requirements of Section 02223] [lean concrete fill in accordance with Section 03300] [directions of Architect/Engineer].

****** [OR] ******

ROCK REMOVAL - EXPLOSIVE METHOD

If rock is uncovered requiring the explosives method for rock disintegration, [notify the Architect/Engineer] [execute as follows].

Advise owners of adjacent buildings or structures in writing, prior to executing seismographic survey. Explain planned blasting and seismic operations.

Obtain a seismic survey prior to rock excavation to determine maximum charges that can be used at different locations in area of excavation without damaging adjacent properties or other work.

Provide seismographic monitoring during progress of blasting operations.

Disintegrate rock and remove from excavation.

Remove rock at excavation bottom to form level bearing.

Remove shaled layers to provide a sound and unshattered base for [footings] [foundations] [________].

In utility trenches, excavate to [6] [____] inches ([150] [____] mm) below invert elevation of pipe and [24] [____] inches ([600] [____] mm) wider than pipe diameter.

Remove excavated material [from site] [________].

Correct unauthorized rock removal or overbreak in accordance with [backfilling and compaction requirements of Section [02223] [________]] [lean concrete fill in accordance with Section [03300] [________]] [directions of Architect/Engineer].

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400] [01410] [________].

Provide for visual inspection of foundation bearing surfaces [and cavities formed by removed rock].

END OF SECTION