California CSLB C-21 Building Moving and Demolition Examination

A demolition contractor needs to estimate the weight of a 30-foot by 40-foot by 6-inch solid reinforced concrete slab (150 lbs/cu ft). What is the total structural weight of the slab in short tons?

• A45.0 short tons
• B60.0 short tons
• C75.0 short tons
• D90.0 short tons

A C-21 contractor estimates the removal of 200 cubic yards of solid brick masonry. If the bulking (swell) factor for broken masonry debris is 45%, what is the total loose volume to be hauled?

• A245 cubic yards
• B290 cubic yards
• C335 cubic yards
• D380 cubic yards

A site clearance project yields 600 loose cubic yards of mixed demolition debris. If standard 10-wheeler dump trucks carry 12 loose cubic yards per trip, how many total truck loads are required?

• A35 total truck loads
• B42 total truck loads
• C50 total truck loads
• D65 total truck loads

A single-story 2,400-square-foot wood-framed residence with stucco exterior has an estimated dead load of 45 pounds per square foot. What is the total structural weight of the building?

• A72,000 pounds (36 tons) only
• B84,000 pounds (42 tons)
• C96,000 pounds (48 tons)
• D108,000 pounds (54 tons)

A commercial demolition project contains 120 tons of structural steel beams. If scrap metal buyers offer $220 per ton and processing labor costs $45 per ton, what is the net salvage credit?

• A$21,000 net salvage credit
• B$24,500 net salvage credit
• C$26,400 net salvage credit
• D$31,800 net salvage credit

A interior selective demolition job requires removing 1,800 square feet of lath and plaster walls. If a 2-worker crew averages 75 square feet per crew-hour, how many crew-hours are required?

• A18 total crew-hours
• B24 total crew-hours
• C30 total crew-hours
• D36 total crew-hours

A demolition project produces 180 short tons of mixed construction waste. The landfill tipping fee is $62 per ton plus an 8% state environmental surcharge. What is the total landfill fee?

• A$10,264.40 total disposal fee
• B$11,160.00 total disposal fee
• C$12,052.80 total disposal fee
• D$13,148.20 total disposal fee

A steel frame structure scheduled for dismantling has 20 columns, each designated as W8x31 and measuring 15 feet in length. What is the total weight of these steel columns?

• A6,200 total pounds of steel
• B7,450 total pounds of steel
• C8,100 total pounds of steel
• D9,300 total pounds of steel

When evaluating a structure for a proposed building move, what primary structural factor determines the spacing and size of main carrying steel needles?

• ALocation of load-bearing walls and piers
• BThickness of interior drywall partitions
• COverall height of exterior roof chimneys
• DTotal square footage of exterior windows

A high-reach demolition excavator costs $280/hour fully operated and consumes 12 gallons of diesel per hour at $4.50/gallon. For a 40-hour demolition project, what is the combined equipment cost?

• A$11,200 total machine and fuel cost
• B$13,360 total machine and fuel cost
• C$15,520 total machine and fuel cost
• D$17,680 total machine and fuel cost

A solid two-wythe brick wall measuring 50 feet long, 12 feet high, and 8 inches thick weighs 120 pounds per cubic foot. What is the total weight of the brick wall in pounds?

• A32,000 total wall weight
• B40,000 total wall weight
• C48,000 total wall weight
• D56,000 total wall weight

A elevated concrete floor slab measuring 60 feet by 40 feet requires temporary shoring posts placed on a 4-foot by 4-foot grid. How many vertical shoring posts are required?

• A120 shoring posts required
• B140 shoring posts required
• C150 shoring posts required
• D176 shoring posts required

An air quality permit requires continuous water misting during mechanical demolition at 15 gallons per minute. If demolition operates 6 hours daily for 5 days, how many total water gallons are needed?

• A27,000 total water gallons
• B32,400 total water gallons
• C36,000 total water gallons
• D41,200 total water gallons

A continuous concrete foundation footing measuring 200 linear feet long, 2 feet wide, and 1.5 feet deep must be removed. What is the total concrete volume in cubic yards?

• A18.50 cubic yards of concrete
• B22.22 cubic yards of concrete
• C26.75 cubic yards of concrete
• D30.00 cubic yards of concrete

A pre-demolition asbestos survey identifies 3,500 square feet of transite siding. If abatement costs $4.50/sq ft for removal and $1.20/sq ft for hazardous disposal, what is the total abatement cost?

• A$15,750 total abatement cost
• B$17,850 total abatement cost
• C$19,950 total abatement cost
• D$22,050 total abatement cost

A 160-ton building is supported on 8 hydraulic jacking points. If load distribution analysis shows that two corner points carry 18% of the total load each, what weight does each corner jack support?

• A18.4 tons (36,800 pounds)
• B21.6 tons (43,200 pounds)
• C24.0 tons (48,000 pounds)
• D28.8 tons (57,600 pounds)

A selective interior timber truss dismantling job involves unfastening 40 roof trusses. If a 2-worker crew takes 45 minutes per truss, how many total worker man-hours are required?

• A60 total worker man-hours
• B75 total worker man-hours
• C90 total worker man-hours
• D120 total worker man-hours

A recycling plan report shows a project generated 450 tons of crushed concrete, 80 tons of scrap steel, and 70 tons of non-recyclable landfilled trash. What is the waste diversion rate achieved?

• A82.50% waste diversion rate
• B88.33% waste diversion rate
• C91.25% waste diversion rate
• D95.00% waste diversion rate

What standard structural engineering design criterion is commonly applied when sizing steel carrying beams to prevent interior plaster cracking when lifting historic houses?

• AMaximum length to height ratio L/h of 10
• BMaximum shear stress limit of 5,000 psi
• CMaximum live load deflection limit of L/360
• DMaximum ultimate bending moment of 100 kip-ft

Removing a 10,000-gallon underground storage tank leaves an excavation cavity (1 gal = 0.1337 cu ft). Including a 15% compaction factor, how many loose cubic yards of backfill must be ordered?

• A42.5 cubic yards of backfill
• B49.5 cubic yards of backfill
• C52.8 cubic yards of backfill
• D57.0 cubic yards of backfill

A heavy site clearing dozer achieves a production rate of clearing 0.75 acres of structural slab and debris per day. How many full work days are required to clear a 4.5-acre site?

• A6.0 full work days required
• B7.5 full work days required
• C8.0 full work days required
• D9.0 full work days required

A rooftop HVAC unit weighing 24,000 pounds must be removed by crane at a 60-foot radius. Adding a 15% safety factor for rigging and dynamic loads, what total load rating is required at 60 feet?

• A24,000 pounds (12.0 tons)
• B27,600 pounds (13.8 tons)
• C31,200 pounds (15.6 tons)
• D36,000 pounds (18.0 tons)

A 40-foot by 40-foot slab requires grid saw-cutting into 4-foot by 4-foot panels prior to breaker removal. Including the 4 perimeter cuts, what is the total linear footage of saw cuts?

• A640 total linear feet of cut
• B760 total linear feet of cut
• C880 total linear feet of cut
• D960 total linear feet of cut

A rectangular demolition site measures 250 feet long by 180 feet wide. Standard chain-link temporary fence panels are 10 feet wide. How many panels are required to enclose the full perimeter?

• A64 temporary fence panels
• B72 temporary fence panels
• C80 temporary fence panels
• D86 temporary fence panels

A house move route crosses under 6 power lines requiring utility lifting ($1,400 per crossing) plus a 4-hour utility standby crew at $350/hour. What is the total utility company charge?

• A$9,800 total utility company fee
• B$11,200 total utility company fee
• C$12,600 total utility company fee
• D$14,000 total utility company fee

Under California Government Code §4216, how far in advance of beginning ground-disturbing demolition work must a contractor contact Underground Service Alert (USA 811)?

• AAt least 24 hours prior to work
• BAt least 2 working days prior
• CAt least 5 business days prior
• DAt least 10 calendar days prior

According to APWA uniform color code standards for USA 811 utility markings, what color paint must a C-21 contractor use to outline proposed excavation or demolition boundaries?

• ARed paint markings
• BYellow paint markings
• CWhite paint markings
• DOrange paint markings

Under South Coast AQMD Rule 1403 and federal NESHAP regulations, how many working days prior to commencing demolition of any facility must written notification be submitted?

• A2 working days notice only
• B5 working days notice
• C7 working days notice
• D10 working days notice

Prior to starting structure demolition work, what mandatory action regarding site utilities must be completed and documented by a competent person under Cal/OSHA §1734?

• AVerify written shutoff confirmation from all utility companies and lock out/tag out servi…
• BVisually inspect exterior meters and cut exposed utility wires at the structure drip loop
• CNotify local fire department and proceed with demolition assuming low voltage is harmless
• DCap main water supply pipe while keeping electric service active for site temporary light…

Under Cal/OSHA §1529 and federal NESHAP standards, when must a comprehensive pre-demolition asbestos building survey be conducted?

• AOnly for buildings constructed prior to 1978
• BFor all facility demolitions regardless of age
• COnly when friable asbestos is visually observed
• DOnly for structures exceeding three story height

Under Cal/OSHA §1532.1 (Lead in Construction), what pre-demolition task is required before workers perform torch-cutting or mechanical grinding on painted structural steel?

• AWipe surfaces with mineral spirits only
• BApply high-volume water mist during cutting only
• CTest surface coatings for lead content first
• DRequire workers to wear cloth dust masks

Under California Business and Professions Code §7058.5, a C-21 contractor must hold an Asbestos Certification (ASB) when contracting to remove asbestos materials exceeding what surface area?

• A10 square feet area only
• B25 square feet area
• C50 square feet area
• D100 square feet area

When a structure to be demolished is within 5 feet of a public sidewalk, what pedestrian protection is required under California Building Code Chapter 33?

• AFully enclosed covered walkway with 150 psf capacity
• BChain-link perimeter fence with posted warning signs
• CDirectional flaggers stationed at each sidewalk end
• DSingle line of traffic cones with caution tape strip

Under CSLB regulations (BPC §7058.7), what special certification must a C-21 contractor maintain to legally perform underground fuel storage tank (UST) removal?

• AAsbestos Certification (ASB)
• BHazardous Substance Removal (HAZ)
• CClass A General Engineering License
• DC-61 D-40 Service Station License

When transporting a structure on California state highways, what maximum vehicle/load width threshold triggers a Caltrans Extra-Legal Transportation Permit?

• A7 feet 0 inches width
• B8 feet 0 inches width
• C8 feet 6 inches width
• D9 feet 6 inches width

Prior to starting site clearing and demolition earthwork, what Stormwater Pollutant Best Management Practice (BMP) must be installed around storm drain inlets?

• APoured concrete capping plugs
• BSolid steel plate protective covers
• CPlywood sheets secured with sandbags only
• DGravel bags or fabric filter barriers

Under Cal/OSHA §1734(b), who must conduct the written structural engineering survey of the building prior to starting any demolition operations?

• AA competent person with structural knowledge
• BThe local municipal building department inspector
• CThe project owner or designated site caretaker
• DA certified industrial hygienist or environmentalist

When excavating underpinning pits beneath an existing foundation wall during site work, what is the maximum standard width of an individual pit section dug at one time?

• A1 to 2 feet section width
• B3 to 4 feet section width
• C6 to 8 feet section width
• D10 to 12 feet section width

Prior to structural demolition of an older commercial building, how must fluorescent light ballasts manufactured before 1979 containing PCBs be handled?

• ACrushed with building rubble and sent to C&D landfill
• BRecycled directly with scrap metal structural components
• CRemoved intact and disposed of as hazardous waste
• DDrained of oil on site and placed in trash dumpsters

Under EPA Section 608 of the Clean Air Act, what mandatory requirement applies to HVAC equipment containing refrigerants prior to mechanical demolition?

• AVented slowly to outdoor atmosphere at night
• BFlushed with water into the municipal sewer line
• CIgnited under controlled conditions to burn off gas
• DEvacuated and recovered by EPA-certified technician

Many California municipal building departments require proof of what public health compliance clearance before issuing a structure demolition permit?

• AEradication of rodents and vector control clearance
• BSoil compaction testing and bearing capacity report
• CSoil pH chemical analysis and agriculture testing
• DComplete removal of topsoil down to bedrock level

According to Cal/OSHA §1741, what temporary fire protection equipment must be maintained on site during building preparation and selective demolition?

• AOne 1-A extinguisher per 5,000 sq ft
• BOne 2-A extinguisher per 3,000 sq ft
• COne 4-A extinguisher per 1,000 sq ft
• DOne 10-B extinguisher per 500 sq ft

Before moving a designated historic landmark structure, what specialized documentation is typically required by municipal historic preservation commissions?

• AFull hazardous soil remediation report
• BEnvironmental Impact Report for highway load
• CHistoric building photo-logging survey
• DStructural demolition bond clearance letter

Under California Civil Code §832, what notice requirement must a land owner or contractor provide to adjoining property owners before excavating below foundation levels?

• AVerbal notice 24 hours prior to digging
• BWritten notice 5 days prior to digging
• CWritten notice 14 days prior to digging
• DWritten notice 30 days prior to digging