Arizona ROC C-57 Wrecking Examination

Under EPA NESHAP regulations (40 CFR Part 61 Subpart M), what is the minimum advance written notice required prior to beginning demolition on a facility containing regulated asbestos-containing material (RACM) above threshold amounts?

• A5 calendar days
• B10 working days
• C14 calendar days
• D30 working days

A demolition contractor encounters old exterior transite wall panels that have become severely weathered and easily crumble into powder when crushed by hand pressure. How is this material classified under EPA guidelines?

• ACategory I non-friable asbestos-containing material
• BCategory II non-friable asbestos-containing material that has remained non-friable
• CRegulated friable asbestos-containing material (RACM)
• DNon-regulated construction debris

According to OSHA 29 CFR 1926.62 (Lead in Construction), what is the Permissible Exposure Limit (PEL) for airborne lead averaged over an 8-hour work shift?

• A50 µg/m³
• B30 µg/m³
• C100 µg/m³
• D15 µg/m³

During manual demolition of structural steel coated with lead-based primer, air monitoring indicates an 8-hour time-weighted average lead concentration of 35 µg/m³. What requirement is triggered under OSHA 1926.62?

• AImmediate shutdown of all work activities across the entire jobsite
• BMandatory full-face supplied-air respirator usage for all workers regardless of duty
• CNo action required since the concentration is below 50 µg/m³
• DInitiation of employee exposure monitoring, medical surveillance, and training because th…

Before flame-cutting or demolishing an underground fuel storage tank (UST) removed from a demolition site, what Lower Explosive Limit (LEL) threshold must be verified with a calibrated combustible gas indicator?

• ALess than 25% LEL
• BLess than 10% LEL
• CLess than 50% LEL
• DExactly 0% LEL with no oxygen present

When salvaging electrical equipment from an industrial facility built in 1970 prior to wrecking, how must older oil-filled transformers and fluorescent lamp ballasts lacking 'No PCBs' labels be managed?

• ACrushed on site and disposed of in a standard C&D (construction and demolition) landfill
• BBurned on site in an open scrap pit to evaporate transformer fluids
• CPresumed to contain Polychlorinated Biphenyls (PCBs) and handled as regulated hazardous w…
• DDrained into municipal storm drains prior to recycling steel casings

Under OSHA 29 CFR 1926.1153, what is the Permissible Exposure Limit (PEL) for Respirable Crystalline Silica during concrete hydraulic breaking and crushing?

• A50 µg/m³ as an 8-hour TWA
• B25 µg/m³ as an 8-hour TWA
• C100 µg/m³ as an 8-hour TWA
• D5 µg/m³ as an 8-hour TWA

Which engineering control is primary and most effective for suppressing silica dust during mechanical demolition of reinforced concrete structures?

• AIncreasing excavator engine RPM
• BUsing compressed air blowers to clear dust from work areas
• COperating heavy diesel exhaust fans in open outdoor areas
• DContinuous wet suppression using integrated water mist nozzles or hose sprayers

When transporting hazardous waste generated during commercial demolition within Arizona (such as lead paint chips or solvent sludge), what document must accompany the transport vehicle under ADEQ rules?

• AA standard commercial bill of lading with no environmental disclosures
• BA Uniform Hazardous Waste Manifest signed by the generator, transporter, and disposal fac…
• CAn informal handwritten inventory signed by the site foreman
• DA city building permit copy attached to the vehicle dashboard

Which asbestos work classification applies under OSHA 1926.1101 to the removal of thermal system insulation (TSI) from steam pipes inside a structure prior to wrecking?

• AClass III asbestos work
• BClass IV asbestos work
• CClass I asbestos work
• DClass II asbestos work

Under OSHA 1926.1101, thermal system insulation installed in a commercial building constructed prior to what year must be treated as Presumed Asbestos-Containing Material (PACM) unless proven otherwise by testing?

• A1980
• B1995
• C1960
• D2005

Prior to structural collapse, mercury-containing thermostats, silent wall switches, and fluorescent tubes should be harvested and managed under which EPA regulatory program?

• ASuperfund National Priorities List
• BResource Conservation and Recovery Act (RCRA) Clean Fill Exemption
• CClean Water Act NPDES General Permit
• DUniversal Waste Rule (40 CFR Part 273)

Before a commercial rooftop HVAC package unit is removed and demolished for scrap, what action is legally required under Section 608 of the Clean Air Act?

• AVenting the refrigerant directly into the atmosphere during early morning hours
• BRecovery of all ozone-depleting refrigerants using certified recovery equipment operated…
• CFlushing the cooling coils with mineral oil to dissolve remaining Freon
• DCrushing the compressor while connected to an active vacuum pump

Under OSHA 1926.850(a), what must a demolition contractor perform and document BEFORE initiating any structural wrecking operations?

• AA soil compaction test around the perimeter foundation
• BA financial audit of scrap metal salvage values
• CAn engineering survey by a competent person to determine the condition of the framing, fl…
• DA complete architectural redesign of adjacent public sidewalks

When manually demolishing a multi-story building storey by storey, what fundamental sequence rule must be followed regarding floor slab and wall removal?

• ADemolition must proceed top-down, completing the removal of upper floor structural member…
• BGround floor load-bearing walls must be knocked out first to collapse the roof inwards
• CExterior curtain walls must be removed on all levels simultaneously before floor removal
• DInterior load-bearing columns should be removed prior to non-load-bearing partitions

What extreme hazard is unique to the mechanical demolition of post-tensioned concrete floor slabs?

• AImmediate chemical reaction of concrete with ambient air
• BHigh voltage static discharge from embedded steel rebar
• CExcessive weight gain of concrete during hydraulic breaking
• DViolent release of stored mechanical energy and tendon whip when high-strength steel tend…

When operating a high-reach demolition excavator equipped with a hydraulic shear, what is the minimum safe exclusion zone radius for ground personnel around the base of the structure being demolished?

• AEqual to half the height of the structure
• BAt least 1.5 times the height of the structural section being demolished
• CExactly 10 feet from the excavator tracks
• DEqual to the length of the excavator bucket hose

Under OSHA 1926.859(b), when using a wrecking ball for structural demolition, the weight of the ball must not exceed what percentage of the crane's rated load capacity at the maximum operating radius?

• A75%
• B100%
• C50%
• D25%

When demolishing an unreinforced masonry chimney or industrial stack by hand from top to bottom, how should workers be positioned relative to the chimney rim?

• AOn working platforms or scaffolding independent of the masonry wall being demolished
• BStanding directly on the top rim of the masonry wall while swinging sledgehammers
• CSuspended inside the flue on a single 1/2-inch Manila rope
• DSupported on an unsecured wooden ladder leaning against the chimney top

Before placing a 15,000-lb compact track loader equipped with a hydraulic hammer on an upper floor concrete slab for interior floor-by-floor demolition, what engineering check must be verified?

• AChecking whether the tracks are painted an approved safety color
• BMeasuring the loader's hydraulic fluid temperature
• CVerifying the loader's backup alarm sound frequency
• DCalculating floor slab live load capacity and installing structural shoring beneath the s…

Under OSHA 1926.854, what is the maximum height an unbraced masonry wall may be left standing above lateral supports during demolition unless designed to withstand wind load?

• A25 feet
• B15 feet
• C30 feet
• D8 feet

During selective interior demolition of a commercial building, a contractor plans to cut major penetrations through structural concrete shear walls. What step is essential before cutting begins?

• AWet down the shear wall with soap and water
• BIncrease the building HVAC fan speed
• CConsult a structural engineer to design temporary bracing or shoring to maintain lateral…
• DInstall decorative drywall covers over the planned cuts

When removing a basement foundation wall that retains adjacent soil, what hazard must be controlled before breaking out the wall concrete?

• ACollapse of adjacent soil and lateral earth pressure causing sudden inward failure of the…
• BSubterranean acoustic echo amplification
• CImmediate oxidation of underground footings
• DLoss of ambient groundwater pressure inside the basement slab

When flame-cutting structural steel roof trusses during building dismantling, how should individual web members be cut to prevent premature collapse of the top chord?

• ACut all bottom chords simultaneously before touching web members
• BCut top chords at the center span first while under full tension load
• CRemove the main end columns before relieving roof truss loads
• DCut diagonal web members in a systematic sequence directed by an engineering plan, mainta…

When operating a hydraulic breaker attachment on an excavator to punch holes in a concrete floor slab, why must operators maintain a safe distance from unsupported slab edges?

• ATo prevent hydraulic fluid from overheating
• BTo prevent the heavy machine weight from shearing off the cantilevered slab edge and fall…
• CTo maintain optimal excavator track tread pattern wear
• DTo reduce engine noise reflections from wall surfaces

Prior to cutting wood heavy-timber roof trusses, what temporary stabilization method is required under ANSI A10.6 to prevent domino tipping of adjacent trusses?

• APainting truss ends with fire-retardant epoxy
• BCovering trusses with heavy canvas tarps
• CInstalling longitudinal temporary bridging, cross-bracing, and secure guy lines to firm a…
• DNailing 1x2-inch wood lath across bottom chords only

What is the primary factor used by licensed blasters to establish the exclusion zone perimeter during a controlled explosive demolition (implosion) of a multi-story building?

• AFlyrock trajectory distance, airblast overpressure limits, and structural fall radius
• BLocal vehicle parking meter density
• CThe length of the electrical detonation cord wire
• DThe height of the nearest municipal water tower

After complete removal of a building basement foundation, how must the resulting excavation pit be finished to prevent future site settlement and hazardous drop-offs?

• ACovered with plywood panels supported on scrap timber
• BLeft open indefinitely to collect rainwater runoff
• CFilled with uncompacted demolition wood debris and tree branches
• DBackfilled with clean engineered fill material placed in lift layers and thoroughly compa…

What is the correct demolition sequence when manually removing a cantilevered concrete balcony projecting from a building facade?

• ACut the building wall support columns first before removing the balcony slab
• BDemolish the outer free edge of the balcony slab working inward toward the supporting bui…
• CCut the inside slab edge flush with the wall while standing on the outer edge of the balc…
• DPlace heavy concrete breakers on the tip of the cantilever balcony to crack it off in one…

When creating temporary wall openings in masonry load-bearing walls during selective demolition, what structural component must be installed above the opening prior to removing masonry units below?

• AA plastic dust barrier curtain
• BA decorative wooden arch molding
• CA properly sized steel or reinforced concrete lintel/header supported on solid jambs
• DAn aluminum extension ladder mounted horizontally

Under Arizona Revised Statutes (A.R.S. § 40-360.21 et seq.), how far in advance of starting demolition or excavation work must a contractor notify Arizona 811 (Blue Stake)?

• AAt least 12 hours prior
• BAt least 10 working days prior
• CAt least 24 hours prior
• DAt least 2 full working days prior (excluding weekends and state holidays)

According to OSHA 1926.850(c), what mandatory step regarding building utility services must be completed before demolition work begins?

• AAll electric, gas, water, steam, sewer, and other service lines must be shut off, capped,…
• BUtility lines should be severed with hydraulic shears while energizing site lighting
• CGas lines must be kept under full pressure to test for structural leaks
• DWater lines must be pressurized to maximum PSI to wash down walls

If temporary electrical power must be maintained inside a building during active structural demolition for site illumination, how must this service be handled under OSHA standards?

• AConnected to existing exposed building wiring
• BRun through bare overhead copper wires tied to rebar
• CRelocated to a protected, dedicated temporary distribution center and clearly identified…
• DRouted loose across floors through active demolition debris drop zones

Under International Building Code (IBC) Chapter 33 and OSHA 1926.851, what is the minimum required vertical clear height for a protective sidewalk canopy erected over a public walkway?

• A6 feet
• B8 feet
• C12 feet
• D10 feet

What is the minimum uniform structural live load design requirement for a sidewalk protective canopy when NO materials or equipment are stored on top of the canopy roof (IBC Chapter 33)?

• A50 lbs per sq ft
• B100 lbs per sq ft
• C300 lbs per sq ft
• D150 lbs per sq ft

If a sidewalk canopy roof is designated to store heavy construction materials or equipment during demolition, what is the minimum uniform live load design rating required by building codes?

• A250 lbs per sq ft
• B150 lbs per sq ft
• C500 lbs per sq ft
• D100 lbs per sq ft

How wide must a protective sidewalk canopy be constructed when protecting an adjacent public sidewalk along a building edge undergo multi-story demolition?

• AExactly 2 feet wide regardless of sidewalk size
• BCovering the full width of the public walkway, or extending at least 4 feet beyond the bu…
• CHalf the width of the adjacent street lane
• DNo wider than the excavator tracks

Under OSHA 1926.855, what is the minimum required width for catch platforms erected along exterior walls during exterior wall demolition?

• A2 feet wide
• B4 feet wide
• C8 feet wide
• D6 feet wide

What is the maximum vertical distance allowed between the working floor level being demolished and the catch platform positioned below it (OSHA 1926.855)?

• A35 feet
• B50 feet
• C10 feet
• D20 feet (not more than 2 stories)

To prevent debris from bouncing off the outer edge of a catch platform, what enclosure requirement must be installed along the outer edge?

• AA standard guardrail with a solid enclosure or heavy wire mesh extending at least 42 inch…
• BA single yellow caution tape strip suspended between posts
• CA 6-inch wood toeboard only
• DNo enclosure is required if workers wear safety glasses

Under OSHA 1926.502(i), floor hole covers installed during building demolition must be capable of supporting without failure at least how much weight?

• AEqual to the weight of one worker (200 lbs)
• BAt least 500 lbs regardless of floor load
• CAt least two times the maximum intended load of employees, equipment, and materials that…
• DFour times the static weight of the cover itself

In addition to load capacity, what two physical requirements apply to all temporary floor hole covers under OSHA 1926.502(i)?

• APainted black and greased around the edges
• BSecured against accidental displacement and clearly marked with the word 'HOLE' or 'COVER'
• CLined with soundproofing foam and nailed flush with carpet
• DEquipped with automatic flashing yellow lights

What are the standard height dimensions for top rails and midrails in an OSHA-compliant perimeter guardrail system on an open floor slab?

• ATop rail 30 inches, midrail 15 inches
• BTop rail 48 inches, midrail 30 inches
• CTop rail 36 inches, midrail 18 inches
• DTop rail 42 inches (±3 inches), midrail located halfway between top rail and floor level…