CSLB C-6 Cabinet, Millwork and Finish Carpentry (Trade Exam) — All Questions

Which item does the CSLB's C-6 definition name among the products a cabinet, millwork and finish carpentry contractor makes?

• a.Sashes✓
• b.Structural headers
• c.Roof trusses
• d.Exterior stair stringers

The C-6 definition lists cabinets, cases, sashes, doors, trims and nonbearing partitions. Roof trusses and structural headers are framing work, and exterior staircases are named in the C-5 framing and rough carpentry classification.Cal. Code Regs. tit. 16 §832.06 (C-6 classification, CSLB)

Besides making cabinets and millwork, what else does the C-6 definition say this contractor does?

• a.Wires the appliances built into them
• b.Designs the structural framing that supports them
• c.Installs the plumbing fixtures set in them
• d.Places, erects and finishes them in structures✓

The definition says the C-6 contractor also places, erects and finishes such cabinets and millwork in structures. Structural design is not part of the classification; plumbing fixtures and electrical wiring belong to the plumbing and electrical trades.Cal. Code Regs. tit. 16 §832.06 (C-6 classification, CSLB)

A client wants a new overhead garage door and new kitchen cabinets. Which item does the CSLB name in the C-5 framing and rough carpentry definition?

• a.The cabinet crown moulding
• b.The overhead garage door✓
• c.The kitchen wall cabinets
• d.The kitchen base cabinets

The C-5 definition lists overhead doors among framing and rough carpentry items. Base and wall cabinets and the crown moulding on them are finish carpentry and millwork described in the C-6 definition.Cal. Code Regs. tit. 16 §832.05 (C-5 classification, CSLB)

Which classification did the C-6 Cabinet, Millwork and Finish Carpentry classification replace on licenses when the 2002 amendments became operative?

• a.C-17 Glazing
• b.C-54 Ceramic and Mosaic Tile
• c.Former C-5 carpentry class✓
• d.B General Building

The C-6 definition records that it replaced the former C-5 Carpentry, Cabinet and Millwork classification, with exceptions for qualifiers who had passed or held the old C-5. The B, C-17 and C-54 classifications were not replaced.Cal. Code Regs. tit. 16 §832.06 (C-6 history provision, CSLB)

A carpenter with no employees wants to install a $700 shelf unit that needs no building permit and does not advertise as licensed. What does the CSLB say?

• a.A license is required if the work takes more than a day
• b.No license is required for this job✓
• c.A license is required because shelves are millwork
• d.A license is required for cabinet work

The CSLB allows unlicensed work only where no permit is required, no employee labor is used and the total of labor, materials and other costs is less than $1,000, and the person does not advertise as licensed. This job meets those conditions; the type of work and the time it takes are not the test.CSLB, Before Applying for the Examination (licensing exemptions)

A handyman splits a $2,400 cabinet installation into three $800 invoices to stay under the licensing threshold. What does the CSLB say?

• a.Each invoice is a separate exempt job
• b.Splitting is allowed with separate payments
• c.Larger projects may not be split to avoid licensing✓
• d.Splitting is allowed if no permit is pulled

The CSLB states that work on a larger project may not be broken down into amounts of less than $1,000 to meet the exemption. Separate invoices, separate payments or the lack of a permit do not change the project's total value.CSLB, Before Applying for the Examination (licensing exemptions)

A federal guide specification for laminate casework lists the quality categories in the industry's architectural woodwork standards. Which grade does it describe as appropriate only under severe funding limitations?

• a.Premium grade
• b.Economy grade✓
• c.Select grade
• d.Custom grade

The guide specification says the casework quality standards list premium, custom and economy grades, recommends custom or premium, and limits economy grade to severe funding limitations. Select is not one of the three casework grades.UFGS 06 41 16.00 10 (casework quality standards)

Before final shop drawing approval, a federal casework project requires a full-size sample unit with at least one door and one drawer. What is that sample called?

• a.A submittal schedule
• b.A product data sheet
• c.A shop drawing
• d.A mock-up✓

The guide specification calls for a full-size mock-up of a typical unit, with at least one door and one drawer assembly, before final shop drawing approval. A submittal schedule is a list, a product data sheet describes a product, and a shop drawing is a drawing, not a built unit.UFGS 06 41 16.00 10 (submittals)

Which dimensions describe one board foot of lumber?

• a.12 by 1 by 1 feet, or its cubic equivalent
• b.12 by 12 by 12 inches, or its cubic equivalent
• c.1 by 1 by 12 inches, or its cubic equivalent
• d.12 by 12 by 1 inches, or its cubic equivalent✓

The Wood Handbook defines a board foot as a board 12 inches long, 12 inches wide and 1 inch thick, or its cubic equivalent (144 cubic inches). A 12-inch cube is a cubic foot; 1 by 1 by 12 inches is only 12 cubic inches; and 12 by 1 by 1 feet is 12 cubic feet.Wood Handbook (FPL-GTR-282), board foot definition

How many board feet are in one piece of 4/4 hard maple 9 inches wide and 12 feet long?

• a.9 board feet✓
• b.12 board feet
• c.7.5 board feet
• d.108 board feet

Board feet equal thickness times width in inches times length in feet, divided by 12: 1 × 9 × 12 ÷ 12 = 9. Twelve board feet uses the length alone; 108 forgets to divide by 12; and 7.5 treats the board as 10 feet long.Wood Handbook (FPL-GTR-282), board foot definition

A cut list has eight pieces of 1-inch stock, each 3 inches wide and 48 inches long. What is the net board footage?

• a.1 board foot
• b.96 board feet
• c.12 board feet
• d.8 board feet✓

Each piece is 1 × 3 × 48 = 144 cubic inches, which is exactly 1 board foot, so eight pieces are 8 board feet. One board foot counts a single piece; 96 forgets to divide by 12 after converting the length to feet (1 × 3 × 4 × 8); and 12 confuses the count.Wood Handbook (FPL-GTR-282), board foot definition

A shop prices a job at $9,600 of cost with a 25 percent markup. What is the selling price?

• a.$11,520
• b.$12,800
• c.$9,625
• d.$12,000✓

Markup is a percentage of cost: 9,600 × 1.25 = $12,000. $12,800 is cost divided by 0.75, which produces a 25 percent margin rather than markup; $11,520 is a 20 percent markup; and $9,625 adds $25 instead of 25 percent.Business estimating arithmetic (markup on cost)

A cabinet job's cost is $15,000. What selling price gives a 40 percent gross margin on the price?

• a.$21,000
• b.$15,600
• c.$25,000✓
• d.$22,500

Price equals cost divided by one minus the margin: 15,000 ÷ 0.60 = $25,000, leaving $10,000, or 40 percent of price. $21,000 is a 40 percent markup on cost, about a 29 percent margin; $15,600 adds 4 percent; and $22,500 is a 50 percent markup, a 33 percent margin.Business estimating arithmetic (margin on price)

An estimator needs 140 linear feet of base moulding installed and adds 15 percent for miters, cuts and defects. How much should be ordered?

• a.165 linear feet
• b.161 linear feet✓
• c.210 linear feet
• d.155 linear feet

Gross equals net times one plus waste: 140 × 1.15 = 161 linear feet. One hundred fifty-five adds only 15 feet; 165 divides 140 by 0.85, treating 15 percent as a yield loss; and 210 is a 50 percent allowance.Estimating arithmetic (waste factor)

Each 4 × 8 sheet of melamine yields five cabinet bottoms after kerfs and trimming. How many sheets are needed for 23 base cabinets with one bottom each?

• a.6 sheets
• b.5 sheets✓
• c.4 sheets
• d.23 sheets

Twenty-three bottoms at five per sheet needs 4.6 sheets, which rounds up to 5 because partial sheets cannot be bought. Four sheets yield only 20 bottoms; 6 sheets is one more than needed; and 23 sheets treats each bottom as a full sheet.Estimating arithmetic (sheet goods)

According to the Wood Handbook's recommended values, what average moisture content suits interior woodwork in the dry southwestern United States?

• a.About 15 percent
• b.About 11 percent
• c.About 6 percent✓
• d.About 8 percent

The Wood Handbook recommends an average of about 6 percent (4 to 9 percent for individual pieces) for interior woodwork in the dry southwestern area. Eight percent is the figure for most of the United States, 11 percent for damp, warm coastal areas, and 15 percent is too wet for interior woodwork.Wood Handbook (FPL-GTR-282), recommended moisture content

Which federal formaldehyde emission standard applies to hardwood plywood with a veneer or composite core?

• a.0.13 ppm
• b.0.11 ppm
• c.0.09 ppm
• d.0.05 ppm✓

The federal rule sets 0.05 ppm for hardwood plywood with a veneer or composite core. The 0.09 ppm limit is for particleboard, 0.11 ppm for medium-density fiberboard and 0.13 ppm for thin MDF.40 CFR §770.10 (TSCA Title VI emission standards)

A California cabinet buyer sees only a "TSCA Title VI compliant" label on new vanity cabinets. What does CARB say about that label?

• a.California rejects products without a CARB-only label
• b.California accepts it in place of a CARB label✓
• c.California requires a separate state test certificate
• d.California limits it to exterior products

CARB states that California accepts products labeled only as TSCA Title VI compliant because the state and federal requirements are very similar. A CARB-only label or a separate state certificate is not required, and the acceptance is not limited to exterior products.CARB Composite Wood Products consumer FAQ

A California restaurant covered by Chapter 11B provides dining counters for customers. What portion of the seating and standing spaces at dining surfaces must comply with the accessible surface rules?

• a.At least 25 percent
• b.At least 10 percent
• c.At least 5 percent✓
• d.One per room

Chapter 11B requires at least 5 percent of the seating and standing spaces at dining surfaces to comply with the accessible dining and work surface section. Ten and 25 percent are not the stated figures, and one per room is not the rule.2025 CBC §11B-226.1 (dining and work surfaces)

What minimum clear floor space does Chapter 11B require in front of an accessible counter or appliance?

• a.30 by 48 inches✓
• b.30 by 30 inches
• c.36 by 60 inches
• d.24 by 36 inches

Chapter 11B sets the clear floor or ground space at 30 inches minimum by 48 inches minimum. Twenty-four by 36 and 30 by 30 inches are too small, and 36 by 60 inches exceeds the stated minimum.2025 CBC §11B-305.3 (clear floor space)

Which statement about hardwoods and softwoods is supported by the Wood Handbook?

• a.The names are botanical✓
• b.Hardwoods are evergreen trees
• c.Hardwoods are harder than softwoods
• d.Softwoods contain vessels; hardwoods do not

The Wood Handbook explains that hardwoods are angiosperms and softwoods gymnosperms, and that some softwoods, such as longleaf pine and Douglas-fir, are harder than some hardwoods. Hardwoods, not softwoods, contain vessels, and temperate hardwoods are usually deciduous, not evergreen.Wood Handbook (FPL-GTR-282), hardwoods and softwoods

In a cherry board, which part is the band of lighter-colored wood next to the bark?

• a.Latewood
• b.Pith
• c.Sapwood✓
• d.Heartwood

The Wood Handbook describes sapwood as the band of lighter-colored wood adjacent to the bark, and heartwood as the darker wood inside it. The pith is the center of the stem, and latewood is the denser part of each growth ring, not a band next to the bark.Wood Handbook (FPL-GTR-282), sapwood and heartwood

In commercial practice, lumber whose growth rings meet the wide face at 60 degrees is classed as what?

• a.Rotary cut
• b.Plainsawn
• c.Flat-grain
• d.Quartersawn✓

The Wood Handbook says lumber with rings at 45 to 90 degrees to the wide face is called quartersawn, and 0 to 45 degrees is plainsawn. Rotary cut describes peeled veneer, and flat-grain is another name for flatsawn or plainsawn lumber.Wood Handbook (FPL-GTR-282), plainsawn and quartersawn

What is wood's equilibrium moisture content?

• a.The moisture content at which the cell cavities are full of water
• b.The moisture content at which it neither gains nor loses moisture✓
• c.The moisture content listed on the grade stamp
• d.The moisture content at which wood is oven-dry

The Wood Handbook defines equilibrium moisture content as the moisture content at which wood is neither gaining nor losing moisture, which depends on the surrounding humidity and temperature. Full cell cavities describe wood above fiber saturation; oven-dry wood is at zero; and a grade stamp is not an equilibrium value.Wood Handbook (FPL-GTR-282), equilibrium moisture content

A sample weighs 110 grams when cut and 100 grams after oven-drying. What is its moisture content?

• a.11 percent
• b.9.1 percent
• c.110 percent
• d.10 percent✓

Moisture content equals the weight of water divided by the oven-dry weight, times 100: (110 − 100) ÷ 100 × 100 = 10 percent. Dividing by the wet weight gives 9.1 percent, which uses the wrong base; 11 and 110 percent misplace the numbers.Wood Handbook (FPL-GTR-282), moisture content formula

Above about what moisture content does the Wood Handbook say meter readings should be considered only qualitative?

• a.20 percent
• b.12 percent
• c.30 percent✓
• d.6 percent

The Handbook says readings greater than 30 percent must be considered only qualitative; resistance meters read reliably from about 6 to 30 percent. Twelve and 20 percent are within the reliable range, and 6 percent is its lower end.Wood Handbook (FPL-GTR-282), electric moisture meters

A wide plainsawn board cups as it dries. Which property of wood explains this?

• a.It shrinks equally in each direction
• b.It shrinks more along the grain than across it
• c.It swells as it dries below 30 percent
• d.It shrinks more tangentially than radially✓

Wood shrinks about twice as much tangentially as radially, so the face nearer the bark shrinks more and the board cups. Shrinkage along the grain is very small; shrinkage is not equal in each direction; and wood shrinks, not swells, as it dries below fiber saturation.Wood Handbook (FPL-GTR-282), dimensional stability

In plywood, what is a crossband?

• a.The outer face veneer on the best side
• b.A ply running parallel to the faces in the center
• c.The edge banding applied to exposed edges
• d.An inner ply crossing the face grain✓

The Wood Handbook calls inner plies whose grain runs perpendicular to the faces crossbands, and inner plies parallel to the faces centers. The outer plies are the face and back, and edge banding is a separate applied material.Wood Handbook (FPL-GTR-282), plywood

Which veneer is made by rotating a log against a knife to produce continuous sheets of flat-grain veneer?

• a.Rotary-cut veneer✓
• b.Sawn veneer
• c.Book-matched veneer
• d.Sliced veneer

The Wood Handbook describes rotary-cut veneer as produced by rotating a log against a knife, giving continuous flat-grain sheets. Sliced veneer is cut from a flitch moved against a knife; sawn veneer is sawn from flitches; and book-matching is a way of arranging leaves, not a cutting method.Wood Handbook (FPL-GTR-282), veneer cutting

Why is particleboard usually made with fine particles on the faces and coarser particles in the core?

• a.To raise the panel's moisture resistance
• b.For a smoother surface to laminate or paint✓
• c.To allow screws to hold better in the edges
• d.To make the panel stronger along its edges

The Wood Handbook says the fine-particle faces give a smoother surface for laminating, overlaying, painting or veneering. The layering is not described as strengthening edges, improving edge screw holding, or adding moisture resistance.Wood Handbook (FPL-GTR-282), particleboard

Which laminate grade is intended for light-duty, semi-exposed cabinet interiors under the federal casework guide specification?

• a.VGS, vertical general purpose
• b.HGS, horizontal general purpose
• c.HGP, horizontal postformable
• d.CLS, cabinet liner standard✓

The guide specification describes cabinet liner standard grade, 0.020 inch, as intended for light-duty semi-exposed interior surfaces. HGS is for horizontal surfaces, VGS for exposed vertical surfaces, and HGP for postformed horizontal surfaces.UFGS 06 41 16.00 10 (laminate grades)

What mainly gives high-pressure decorative laminate its stain and abrasion resistance?

• a.The contact adhesive
• b.Melamine overlay sheets✓
• c.The particleboard substrate
• d.Phenolic kraft core sheets

The Wood Handbook explains that thin overlay sheets with more melamine resin provide stain and abrasion resistance, while phenolic kraft sheets make up most of the thickness. The substrate and the adhesive are not the source of surface resistance.Wood Handbook (FPL-GTR-282), decorative laminates

When is a spreader not required on a hand-fed table saw under Section 4300.1?

• a.When ripping stock thicker than 1 inch
• b.When dadoing, grooving or crosscutting✓
• c.When the operator uses a push stick
• d.When ripping hardwood with a sharp blade

Section 4300.1 requires a spreader except when crosscutting, grooving, dadoing or rabbeting. Ripping is exactly when the spreader is needed, regardless of thickness, species or blade sharpness, and a push stick does not replace it.Cal. Code Regs. tit. 8 §4300.1 (table saws)

What does Cal/OSHA call a work-guiding, hold-down device with angled spring-like fingers that keeps stock against the fence?

• a.A riving hood
• b.Featherboard✓
• c.A push block
• d.A spreader

Section 4297 defines a comb or featherboard as a work-guiding and hold-down device with spring-like fingers angled in the direction of travel. A spreader keeps the kerf open; a push block pushes stock over cutters; and a riving hood is not the defined term.Cal. Code Regs. tit. 8 §4297 (definitions)

A radial arm saw is used for ripping. In which direction must the stock be fed?

• a.Against the direction the blade turns✓
• b.With the direction the blade turns
• c.From either end, if the guard is down
• d.From the end marked for crosscutting

Section 4309 requires ripping against the direction in which the blade turns, with a label at the rear reading DO NOT RIP FROM THIS END. Feeding with the rotation pulls the stock through; neither end is acceptable at will; and crosscut markings do not govern ripping.Cal. Code Regs. tit. 8 §4309 (radial arm saws)

What is the maximum space allowed between a disc sander's revolving disc and the edge of its table?

• a.1/2 inch
• b.1/4 inch✓
• c.1/8 inch
• d.1 inch

Section 4313 limits the space between the revolving disc and the table edge to 1/4 inch and requires the periphery and back of the disc to be guarded. One-half and 1 inch exceed the limit, and 1/8 inch is the jointer's rear-table clearance, not this rule.Cal. Code Regs. tit. 8 §4313 (disc sanders)

What does Cal/OSHA require for the boring bits on a boring machine?

• a.A guard over the bit and chuck✓
• b.A guard below the table
• c.No guard, because bits turn slowly
• d.A guard when boring hardwood

Section 4316 requires boring bits to have a guard that encloses all portions of the bit and chuck above the material. Guarding only below the table misses the exposed bit; there is no speed or species exception.Cal. Code Regs. tit. 8 §4316 (boring machines)

Glue is spread on two cabinet parts, which then sit apart for several minutes before assembly. What does the Wood Handbook call this period, and what is its risk?

• a.Clamp time; the glue may squeeze out
• b.Pot life; the glue may freeze
• c.Closed assembly; the glue may cure too fast
• d.Open assembly; glue may dry out✓

The Handbook says that during open assembly the adhesive loses solvent to the air and the wood and can become too dry to form a useful bond. Closed assembly begins when the surfaces are joined; pot life refers to mixed adhesive in the container; and clamp time follows assembly.Wood Handbook (FPL-GTR-282), adhesives

A shop glues panels from wood at 4 percent moisture content in a very dry winter shop. What does the Wood Handbook warn about bonding very dry wood with waterborne glue?

• a.The glue cures stronger than normal
• b.Moisture content has no effect on bonding
• c.The wood absorbs the glue's water too fast✓
• d.The glue foams and expands in the joint

The Handbook says aqueous adhesives dry out prematurely on wood below 6 percent moisture content because the wood absorbs their water so quickly that flow and penetration suffer. The bond is not stronger, the glue does not foam, and moisture content strongly affects bonding.Wood Handbook (FPL-GTR-282), bonding and moisture content

Compared with screws in side grain, about how much withdrawal resistance do screws in end grain average when splitting is avoided?

• a.About 75 percent✓
• b.About 50 percent
• c.About the same
• d.About 25 percent

The Wood Handbook says screws in end grain average about 75 percent of the withdrawal load of screws in side grain. Twenty-five and 50 percent understate it, and end grain holds less than side grain, not the same.Wood Handbook (FPL-GTR-282), fastenings

Under the federal casework guide specification, what is the minimum ANSI/BHMA A156.9 grade for cabinet hardware, outside schools and hospitals?

• a.No grade is specified
• b.Grade 2✓
• c.Grade 3
• d.Grade 1

The guide specification requires cabinet hardware to meet ANSI/BHMA A156.9 Grade 2 at a minimum, with Grade 1 for school and hospital applications. Grade 3 is below the stated minimum, and a grade is specified.UFGS 06 41 16.00 10 (cabinet hardware)

Which information must appear on a TSCA Title VI label for a bundle of composite wood panels?

• a.The panel's measured emission in ppm
• b.The buyer's name and the job location
• c.Fabricator name, month and year of manufacture
• d.Producer, lot, certifier number, statement✓

Panel labels must show the panel producer's name, the lot number, the EPA TSCA Title VI certifier's number and a statement that the products are certified. Fabricator name and month/year belong on finished-goods labels; buyer and job details and a ppm value are not label requirements.40 CFR §770.45 (labeling)

Kiln-dried exterior trim is stored in a closed shed with an unpaved floor. How high above the floor should the supports hold it, per the Wood Handbook?

• a.At least 6 inches
• b.At least 12 inches✓
• c.At least 2 inches
• d.At least 24 inches

The Handbook recommends supports at least 6 inches high on a paved floor and 12 inches if the floor is not paved. Six inches is the paved-floor figure; 2 inches is too low; and 24 inches is more than the recommendation.Wood Handbook (FPL-GTR-282), storage of finish and factory lumber

Stair handrail stock overhangs the rear of a commercial delivery truck by 5 feet. What does the federal rule require?

• a.A white cloth tied to the load
• b.No flags until the overhang reaches 10 feet
• c.Red or orange flags on the load's end✓
• d.Hazard lights on the cab

A load extending more than 4 feet beyond the rear of a commercial motor vehicle must have its extremities marked with red or orange fluorescent warning flags at least 18 inches square. Ten feet is not the threshold; a white cloth does not meet the rule; and cab hazard lights do not mark the load.49 CFR §393.87 (warning flags on projecting loads)

Under federal lead rules, which home is "target housing" for a cabinet remodel?

• a.A house built in 1982 with children living there
• b.A 1990 house with original painted cabinets
• c.A house built in 1974 with children living there✓
• d.A new house built in 2020

Target housing is housing built before 1978, with limited exceptions, so a 1974 house qualifies. Houses built in 1982 or 2020 are not target housing, and painted cabinets do not make a 1990 house target housing.40 CFR §745.103 (target housing)

A pre-1978 preschool classroom is visited by the same children several days a week. What does the RRP rule call such a building?

• a.An abatement site
• b.A public accommodation
• c.A child-occupied facility✓
• d.Target housing

The RRP rule defines a child-occupied facility as a pre-1978 building or portion visited regularly by the same child under 6 on the schedule the rule sets. Public accommodation is an accessibility term; target housing refers to housing; and abatement is a different activity from renovation.40 CFR §745.83 (child-occupied facility)

A contractor replaces two painted exterior window casings totaling 14 square feet on a pre-1978 house and uses no prohibited practices. Why might the minor repair exception still not apply?

• a.Window replacement is excluded✓
• b.Exterior work has no minor-repair exception
• c.Casings are not painted components
• d.The limit outside is 6 square feet

The exception covers up to 20 square feet of exterior painted surface, but not work that involves window replacement or demolition of painted surfaces. Exterior work can be minor repair; 6 square feet is the interior per-room limit; and painted casings are painted components.40 CFR §745.83 (minor repair and maintenance)

Which RRP practice requires a shroud and a HEPA vacuum attachment on the machine?

• a.Hand scraping painted trim
• b.Power planing painted trim✓
• c.Wet misting before scraping
• d.Using a heat gun below 1,100 °F

High-speed machines such as power planers, sanders and grinders are prohibited on painted surfaces unless shrouded and fitted with a HEPA vacuum attachment. Hand scraping and wet misting are not high-speed machines, and a heat gun below 1,100 degrees Fahrenheit is permitted without a shroud.40 CFR §745.85 (prohibited practices)

For exterior RRP work on a pre-1978 house, how far beyond the work must ground sheeting extend at a minimum?

• a.10 feet or more✓
• b.6 feet, or farther if needed
• c.3 feet
• d.20 feet

Exterior ground sheeting must extend 10 feet beyond the perimeter of the surfaces being renovated, or farther as needed to collect debris. Six feet is the interior floor figure; 3 feet is too short; and 20 feet is the exterior minor-repair area limit, not a containment distance.40 CFR §745.85 (exterior containment)

After interior RRP work, who must perform the visual inspection for remaining dust, debris or residue?

• a.The homeowner
• b.A certified renovator✓
• c.A laborer on the crew
• d.The local building inspector

The rule requires a certified renovator to perform the visual inspection and to have the area re-cleaned until it passes. The homeowner, an untrained laborer and the building inspector are not assigned that task.40 CFR §745.85 (cleaning verification)