RCS-001-CON — Learner reference

1. Recognize silica dust and health effects

By the end: Identify materials, tasks and health hazards before exposure.

Respirable crystalline silica is the very small airborne fraction of crystalline silica that can reach deep into the lungs. Quartz, cristobalite and tridymite are crystalline forms. Sand, stone, concrete, mortar, brick and artificial stone can contain silica. Cutting, grinding, drilling, crushing and abrasive blasting can release respirable dust; the amount depends on the material, process and controls.

Exposure can cause silicosis, lung cancer, chronic obstructive pulmonary disease and kidney disease. Silicosis scars the lungs and has no cure. OSHA hazard communication also requires addressing immune-system effects. Serious injury can develop before a worker recognizes symptoms; feeling well is not evidence that exposure is controlled.

A visible cloud is a warning, but hazardous respirable particles may be present when the air looks clear. A product’s bulk silica percentage does not measure the concentration in a worker’s breathing zone. Use the applicable exposure-control route and reliable exposure evidence, not sight, smell or symptoms, to judge protection.

Read the actual label and safety data sheet and identify the tasks that release dust. Consider nearby workers, cleaning, maintenance, disposal and other employers. A finished product can become an inhalation hazard when it is cut or ground. Discuss unexpected material or changed work with the responsible employer contact before continuing.

Keep dust at its source using the specified controls. Do not wait for a cough to report a failed water supply, damaged shroud or ineffective capture. Report symptoms to the appropriate health professional and explain the exposure history; workplace hazard reporting and medical care serve different purposes.

Basis: 1926.1153(i); 1910.1200

2. Choose the rule and understand the limits

By the end: Distinguish the action level, exposure limit and applicable control route.

This track addresses construction under 1926.1153. The rule applies to occupational construction exposure except where exposure will remain below 25 micrograms per cubic meter as an eight-hour time-weighted average under any foreseeable conditions. Do not claim that exception from one favorable observation or an assumption that wet work is always safe.

The action level is 25 micrograms per cubic meter, written µg/m³, as an eight-hour time-weighted average. The permissible exposure limit, or PEL, is 50 µg/m³ as an eight-hour average. These are different thresholds with different consequences. They are not instantaneous ceiling values, and a short task can still contribute substantially to the shift exposure.

Employee exposure is evaluated without credit for a respirator. A measured 60 µg/m³ does not become a below-action-level exposure for assessment or surveillance simply because a respirator is worn. Use the appropriate measurement and control requirements instead of subtracting a guessed protection factor from the result.

Construction provides two control routes. For a task listed in Table 1, fully and properly implement its specified engineering controls, work practices and respiratory protection. Otherwise use the alternative exposure-control requirements, including assessment and control to the PEL. Table 1 does not waive the applicable written-plan, housekeeping, training or medical-surveillance duties.

Confirm the actual work and jurisdiction. State-plan requirements and other applicable standards may add duties. This knowledge course explains the federal baseline; it does not replace an employer’s exposure evaluation, written procedures or task-specific instruction. Identify the responsible contact before work begins.

Basis: 1926.1153(a)–(d)

3. Assess exposure and respond to monitoring

By the end: Use the correct assessment option and monitoring intervals.

This lesson describes the alternative exposure-control route. A task fully and properly performed under Table 1 does not require the alternative exposure assessment for that task. Verify all Table 1 conditions before relying on that route.

Where exposure assessment is required, assess each employee who is or may reasonably be expected to be exposed at or above the action level. The performance option uses air monitoring, objective data or both sufficient to characterize the eight-hour time-weighted average accurately. Data must represent actual conditions; a generic equipment advertisement is not an exposure assessment.

Objective data must reflect conditions closely resembling, or with higher exposure potential than, the actual process, material, controls, work practices and environment. Check the underlying measurements and assumptions. A change from outdoor cutting to an enclosed room or from wet to dry work can invalidate a previous basis.

The scheduled-monitoring option starts with personal breathing-zone samples for each shift, job classification and work area. Representative sampling must include the employees expected to have the highest exposures. Use a laboratory that meets the standard’s Appendix A requirements. A room sample taken far from the work is not automatically representative personal exposure evidence.

If initial monitoring is below 25 micrograms per cubic meter as an eight-hour average, scheduled monitoring may stop for represented employees. Results at or above 25 and at or below 50 require repeat monitoring within six months. Results above 50 require repeat monitoring within three months. A result exactly at 50 is in the six-month category; it does not remove other applicable duties.

After noninitial monitoring falls below 25, repeat within six months until two consecutive measurements at least seven days apart are below the action level; monitoring may then stop for represented employees. Reassess whenever changes in production, process, controls, personnel or work practices may cause new or additional exposure at or above the action level, or there is reason to believe this has occurred. Discontinued scheduled monitoring does not cancel reassessment.

Basis: 1926.1153(d)(2)

4. Apply Table 1 to the actual task

By the end: Match the complete Table 1 row, environment and combined task time.

Table 1 is a list of specified equipment and tasks with engineering controls, work practices and respiratory protection. Match the actual task to the exact row. Follow every condition, including outdoor-only limits, water delivery, dust collection, manufacturer operation and maintenance and the required respirator APF. A similar-looking tool is not enough.

The table separates tasks lasting four hours or less per shift from tasks lasting more than four hours. When an employee performs more than one Table 1 task, add their durations. If the combined time exceeds four hours, use the more-than-four-hour respirator column for each task. Three hours of saw work plus two hours of chipping is five hours, even though neither task alone exceeds four.

For a handheld power saw with integrated continuous water delivery to the blade, the outdoor row requires no respirator at four hours or less and APF 10 above four hours. Indoors or in an enclosed area, APF 10 is required for both durations. A stationary masonry saw with its specified continuous water control has no respirator requirement in either duration column. These are different rows; do not transfer one saw’s requirements to another.

A handheld grinder used for mortar removal, or tuckpointing, requires the specified shroud and dust collection with at least 25 cubic feet per minute per inch of wheel diameter, a filter of at least 99 percent efficiency and a cyclonic preseparator or filter-cleaning mechanism. Required APF is 10 for four hours or less and 25 above four hours. Do not assume an APF 10 respirator satisfies the longer-duration requirement.

These examples do not reproduce all 18 rows. Open the official Table 1 and verify the row for the actual equipment, task and conditions before work. If the task is unlisted or the complete row cannot be implemented, the employer must use the alternative control route. “None” in a respirator column is conditional on complete implementation, not permission to omit the dust controls.

Basis: 1926.1153(c), Table 1

5. Check water, collectors and protective cabs

By the end: Recognize the equipment details that make Table 1 controls effective.

Use tools according to the manufacturer’s instructions to minimize dust emissions. For Table 1 wet methods, supply water at a flow sufficient to minimize visible dust release. Indoors or in enclosed areas, provide exhaust as needed to minimize accumulation of visible airborne dust. This operating check does not establish that all invisible exposure is below the PEL.

The Table 1 handheld and stand-mounted drill row uses a commercially available shroud or cowling and dust collection with the manufacturer-recommended airflow, a filter at least 99 percent efficient and a filter-cleaning mechanism. Use a HEPA-filtered vacuum to clean holes. Do not substitute uncontrolled compressed air for the specified hole-cleaning method.

Table 1 controls differ across equipment. Certain fiber-cement saw, drivable saw, dowel-drilling and milling rows have outdoor, size, depth or other limits. Walk-behind floor grinding has its own wet or dust-collection options and indoor cleanup provisions. Read the whole row rather than applying a general “wet tool” rule to every activity.

Where Table 1 specifies an enclosed cab or booth, keep it as free as practicable of settled dust, maintain door seals and closing mechanisms, and keep gaskets and seals in good condition. Provide positive pressure with continuous fresh air, incoming-air filtration of at least 95 percent in the 0.3–10 micrometer range, such as MERV 16 or better, and heating and cooling. An open window can defeat the enclosure.

For heavy equipment, distinguish demolition or fracturing from grading and excavation without fracturing. Some rows require water as needed to protect employees outside the cab who are engaged in the task. A protected operator does not prove that a nearby laborer is protected. Coordinate access and the actual work positions with the competent person.

Basis: 1926.1153(c)(2), Table 1

6. Use respirators within the required program

By the end: Recognize the prerequisites for required respirator use.

A respirator is one part of exposure control. Required use must follow 1910.134, including an employer respiratory-protection program administered by a qualified person. Select a NIOSH-approved respirator appropriate for the contaminant, concentration, assigned protection factor and task. A loose face covering is not a substitute for a selected respirator.

The assigned protection factor, or APF, describes the expected protection from a class of respirator when used within an effective program. It is not filter efficiency. N95 does not mean APF 95. Do not substitute a respirator by guessing from the filter label; use the employer’s approved selection and the applicable silica requirements.

The employee needs medical evaluation before fit testing or required use. Tight-fitting respirators must be fit tested before initial use, when a different facepiece is used and at least annually. Changes affecting fit can require another test. A user seal check is required every time a tight-fitting respirator is put on; it does not replace a fit test.

Facial hair or other conditions must not interfere with the face-to-facepiece seal or valve function. Inspect, maintain, clean and store equipment as instructed. If fit or breathing resistance changes, equipment fails or the worker needs to leave, follow the program’s safe-exit and correction procedures rather than continuing with uncertain protection.

Respirator training occurs before required use, at least annually and again when changes or knowledge gaps make it necessary. Silica medical surveillance and respirator medical evaluation are different requirements. A worker can need respirator clearance even if the silica surveillance threshold is not met. Online course completion provides neither medical clearance nor a fit test.

Basis: 1926.1153(e); 1910.134

7. Clean without putting dust back into the air

By the end: Choose compliant housekeeping methods and recognize narrow exceptions.

Dust on floors, clothing, tools and equipment can become airborne again during cleanup. Plan the cleaning method along with the production task. Wet methods, HEPA-filtered vacuuming and other methods that minimize the likelihood of exposure are preferred to redistributing dust into workers’ breathing zones.

Do not allow dry sweeping or dry brushing where it could contribute to employee silica exposure unless wet sweeping, HEPA-filtered vacuuming or another method that minimizes exposure is not feasible. Convenience or a faster cleanup is not evidence that alternatives are infeasible. Ask the responsible person to evaluate a real constraint and choose an effective method.

Do not use compressed air to clean clothing or surfaces where it could contribute to exposure unless the air is used with a ventilation system that effectively captures the dust cloud, or no alternative method is feasible. Wearing a respirator does not, by itself, create an exception. Never direct an uncontrolled dust cloud toward another person.

HEPA means a filter at least 99.97 percent efficient for particles 0.3 micrometers in diameter. This differs from certain Table 1 dust-collector specifications of 99 percent. Use the specified equipment for the particular task; an ordinary shop vacuum is not automatically a HEPA vacuum. Maintain seals and filters according to instructions.

As a practical control, contain slurry and collected dust so they are not tracked or released into other areas. Wet residue can dry and become a new source of dust. Empty collectors and replace filters using the manufacturer’s dust-containment procedure. Do not blow a loaded filter clean into the workplace. Confirm that cleaning and waste handling are covered by the plan.

Basis: 1926.1153(f)

8. Use the written plan and access controls

By the end: Find the actual plan, responsible people and protected work boundaries.

The employer must establish and implement a written exposure-control plan. It describes tasks involving silica exposure, the engineering controls, work practices and respiratory protection used for each task, and housekeeping measures. Review and evaluate its effectiveness at least annually and update it as necessary. The plan must describe the work actually performed.

The construction plan also describes procedures to restrict access when necessary to minimize the number of exposed employees and their exposure level, including exposure generated by other employers or sole proprietors. Coordinate dusty tasks and adjacent work; a worker should not assume that a different contractor’s dust is outside the employer’s responsibility.

Designate a competent person to make frequent and regular inspections of jobsites, materials and equipment to implement the written plan. That person must be capable of identifying existing and foreseeable silica hazards and have authorization to take prompt corrective measures. Workers must know the competent person’s identity. Completing this course alone does not establish competence or authority.

Use the competent person’s inspections and worker reports to correct failed controls promptly. Restrict exposure while corrections are made. No universal daily checklist format is prescribed by this silica provision, but the required frequent and regular inspection duty must actually be performed.

Make the written plan available for examination and copying on request to covered employees, their designated representatives, OSHA and NIOSH as specified by the standard. Know where the current version is kept and whom to ask about a gap. An annual review is a plan requirement, not a universal annual silica-course requirement.

Basis: 1926.1153(g)

9. Understand medical surveillance and privacy

By the end: Recognize the correct trigger, exam timing and confidentiality limits.

Construction employers must make medical surveillance available at no cost and at a reasonable time and place to employees required by the silica standard to use a respirator for 30 or more days per year. Plan for expected qualifying work; do not wait for symptoms or treat a course score as screening. This construction trigger is different from the general-industry exposure-based trigger.

A physician or other licensed health care professional, or PLHCP, performs the examination. Offer the initial examination within 30 days after initial assignment unless the employee received a compliant examination within the last three years. The baseline includes medical and work history, a physical exam emphasizing the respiratory system, a chest X-ray interpreted by a NIOSH-certified B Reader, pulmonary function testing by a technician with current NIOSH-approved spirometry training, a test for latent tuberculosis and other tests the PLHCP considers appropriate.

Provide periodic examinations at least every three years, or more frequently if the PLHCP recommends. The baseline tuberculosis test is not automatically a required part of every periodic examination. Give the PLHCP the standard, the employee’s duties, exposure levels, protective equipment and duration of use, and relevant prior examination records within the employer’s control.

Ensure the PLHCP explains the examination results and provides a written medical report to the employee within 30 days of the examination. The report includes findings, recommended limits and any need for a specialist. The employer’s written medical opinion, also due within 30 days, is more limited: examination date, compliance with the examination requirements and recommended restrictions on respirator use.

The employer opinion may include recommended limits on silica exposure and a statement about specialist examination only with the employee’s written authorization. Give the employee a copy of the employer opinion within 30 days of the examination. If that opinion recommends specialist examination, make it available within 30 days of receiving the opinion. Keep diagnoses out of training worksheets, public discussions and general supervisor checklists.

Medical surveillance supports early detection and advice; it does not make uncontrolled exposure acceptable. Respirator medical evaluation is a separate requirement before fit testing or required use, even where the silica surveillance trigger is not met. Direct personal health questions to the PLHCP and administrative scheduling questions to the designated employer contact.

Basis: 1926.1153(h)

10. Receive results and access records

By the end: Recognize notification deadlines and the records that support protection.

For exposure assessments under the alternative route, notify each affected employee in writing within five working days after completing the assessment. Give individual written notice or post results in an appropriate location accessible to all affected employees. A verbal comment at a meeting is not the specified written notification.

When exposure exceeds the PEL, the written notification must describe the corrective action being taken to reduce exposure to or below the PEL. Reporting the number alone is insufficient. Explain which workers and conditions the result represents and where employees can ask questions about protection.

Provide affected employees or their designated representatives an opportunity to observe air monitoring. If observation requires entry into an area where protective clothing or equipment is required, provide it at no cost and ensure its use. Observation rights do not authorize entry without the applicable protection.

Maintain accurate air-monitoring records, including date, task, sampling and analytical methods, sample number and duration, results, laboratory, protective equipment and names and job classifications of represented and sampled employees. Objective-data records identify the material, source, testing protocol and results, process or activity and other relevant conditions. Preserve enough context to evaluate whether the data apply.

Maintain the required medical-surveillance records, including employee identity, PLHCP or specialist opinions and the information supplied to the health professional. Maintain and make records available as required by 1910.1020. Use the employer’s confidential records process; do not copy health details into a course discussion. A completed training form does not replace exposure or medical records.

Basis: 1926.1153(d)(2)(vi)–(vii), (j)

11. Respond to failed controls and changed work

By the end: Stop relying on controls that no longer match the task.

Before starting, confirm that the planned material, tool, controls, location and work duration match the basis used by the employer. Identify where others could be exposed. A control method is not just a name on a plan: it must be installed, operated and maintained correctly during the actual work.

A disconnected hose, empty water supply, clogged collector, damaged shroud or open protective cab can undermine the exposure-control method. Stop the affected dust-generating work safely, move to the designated safe area and report the problem. Keep other workers away from the affected exposure until the employer verifies correction.

Do not silently switch to dry cutting, remove a guard or shroud, defeat a filter alarm or extend work beyond an applicable method’s limits. An alternate method requires a valid regulatory basis and the appropriate controls, assessment and respirator program before use. Production pressure does not supply that basis.

Changes can include a different material, longer task time, indoor work, several simultaneous dust sources or maintenance on a loaded collector. Communicate the change so exposure evidence, control selection, access and training can be checked. Consider the worker doing the cleaning or repair as well as the operator.

Use the actual employer reporting route and emergency arrangements. For acute distress, follow the emergency plan and obtain medical help; do not assume every breathing problem is harmless dust irritation. This course does not qualify a worker to enter an unknown hazardous atmosphere or perform rescue. Record the failure, corrective action and verification appropriate to the workplace.

Basis: 1926.1153(c)–(g)

12. Demonstrate workplace understanding

By the end: Connect online knowledge to the actual task and employer instruction.

Include silica in the hazard communication program. Employees need access to container labels and safety data sheets and training under the applicable Hazard Communication Standard. Explain cancer, lung, immune-system and kidney hazards, the specific tasks that can expose the worker, and the measures the employer uses to protect employees.

Ensure each employee covered by the silica training provision can demonstrate knowledge and understanding of the applicable standard, task controls, engineering methods, work practices and required respirators. Training also addresses the purpose and description of medical surveillance. Make a copy of the standard readily available without cost.

Construction instruction must also identify the competent person designated under the written exposure-control plan. Ask the worker to explain the actual Table 1 or alternative method, find the task controls and identify who can order prompt correction. Practice must use a safe setup; do not generate uncontrolled dust to test a learner.

Use language and methods workers understand, allow questions, and check knowledge through explanation and safe demonstration. A learner should be able to identify a failed control, select the approved housekeeping method and explain whom to notify. Correct gaps and provide further instruction when tasks, equipment or understanding change.

Neither silica standard specifies a universal annual silica course, fixed course hours or the Academy’s 80-percent passing score. Annual plan review and annual respiratory-protection training are separate duties. The Academy requires all critical quiz items correct as well as its passing score; those rules assess this knowledge component only.

Before assignment, the employer must complete the actual exposure evaluation, control implementation, applicable respiratory program and surveillance arrangements, and verify task understanding. This course does not certify a competent person, industrial hygienist, medical professional or respirator fit tester. Use the worksheets to document real actions and unresolved gaps, not to manufacture evidence of work that has not occurred.

Basis: 1926.1153(i); 1910.1200; 1910.134(k)