A connected hose does not prove adequate capture. Check the shroud contact, hose, filter, collection capacity, alarms and required airflow; preserve exposure controls while emptying or servicing the extractor.
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorization are required before use.
Stop before starting
Stop for lost capture, an alarm or dust escape, wheel damage/vibration, unstable access, unknown coating, unexpected cracks, reinforcement or embedded services. Changing the method requires renewed review.
1. Legal and technical scope
| Basis | Scope and limits |
|---|---|
| OSHA 1926.1153 | Construction silica: complete applicable Table 1 controls or alternative exposure-control route; housekeeping and written plan. |
| OSHA handheld grinding fact sheet | Official explanatory guidance for tasks other than mortar removal; use current regulation for exact controls. |
For construction, apply 1926.1153. Match the actual task to Table 1 item (xii), handheld grinding other than mortar removal, and implement every applicable control and duration/location-dependent respirator requirement; otherwise use paragraph (d) exposure-assessment controls. Tuckpointing is a different task. General-industry work requires a separate 1910.1053 assessment. A connected vacuum or ordinary dust mask does not prove compliance.
2. Scope and required inputs
Included work
Shallow dry grinding of known uncoated concrete wall projections using a compatible handheld grinder, shroud and dust extractor from stable approved access.
Separate assessment
Structural demolition, exposed reinforcement, unknown coatings, asbestos/lead investigation, wet-method substitution, extended overhead grinding and rope access require separate assessment.
| Required input | Evidence to obtain |
|---|---|
| Define wall scope | Wall identity; Services and cracks; Depth and limits; Coating assessment |
| Inspect tool isolated | Wheel and model; Isolation method; Cable condition; Shroud fit |
| Prepare capture | Flow and alarm; Hose and filter; Exposure-control route; Respirator program |
| Position and start | Access condition; Grip and stance; Hose route; Capture at start |
No actual equipment model, SDS, site measurements, design calculations or authorization record was supplied. Product-specific limits and methods must be verified before use. Federal OSHA is a baseline within its scope; determine the applicable State Plan and local requirements. Manufacturer guidance is not government approval; an incorporated standard differs from voluntary guidance. No nationwide-compliance or expert-approval claim is made.
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Define wall scope | 1. Silica inhalation2. Hidden services3. Structural damage4. Coating exposure | 1. Material unknown2. Services unmapped3. Depth undefined4. Old coating ignored | 1. Identify wall material2. Check embedded items3. Set removal boundary4. Hold unknown surfaces | 1. Wall identity2. Services and cracks3. Depth and limits4. Coating assessment | ||||
| 2. Inspect tool isolated | 1. Wheel burst2. Unexpected start3. Electric shock4. Guard contact | 1. Speed mismatch2. Stop only3. Cable damaged4. Wrong shroud | 1. Verify wheel and speed2. Isolate for setting3. Inspect supply4. Fit compatible guard | 1. Wheel and model2. Isolation method3. Cable condition4. Shroud fit | ||||
| 3. Prepare capture | 1. Dust escape2. Bystander exposure3. Respirator failure4. Bag release | 1. Clogged filter2. No boundary3. Wrong protection4. Damaged collection | 1. Verify capture system2. Separate adjacent work3. Apply exposure plan4. Check sealed collection | 1. Flow and alarm2. Hose and filter3. Exposure-control route4. Respirator program | ||||
| 4. Position and start | 1. Loss of balance2. Kickback3. Hose trip4. Overreach | 1. Unstable access2. One-handed grip3. Hose snag4. Poor reach | 1. Use approved platform2. Maintain two-hand grip3. Route hose safely4. Reposition access | 1. Access condition2. Grip and stance3. Hose route4. Capture at start | ||||
| 5. Grind and monitor | 1. Silica exposure2. Wheel catch3. Excess removal4. Fatigue error | 1. Alarm ignored2. Edge overloaded3. Depth unchecked4. Prolonged reach | 1. Stop lost capture2. Use specified movement3. Check surface depth4. Pause and reposition | 1. Dust and alarm2. Noise and vibration3. Depth and cracks4. Worker condition | ||||
| 6. Stop and inspect | 1. Coastdown contact2. Hot wheel3. Hidden wall damage4. Restart exposure | 1. Tool laid down early2. Wheel touched3. Inspection skipped4. Hands near trigger | 1. Wait for full stop2. Set tool safely3. Inspect treated area4. Control restart | 1. Full stop2. Wheel temperature3. Surface inspection4. Held locations | ||||
| 7. Hold equipment fault | 1. Repeat dust leak2. Wheel fragment3. Unexpected start4. Uncontrolled waste | 1. Filter fault ignored2. Damage missed3. Live adjustment4. Bag opened freely | 1. Stop and disconnect2. Inspect tool and capture3. Correct approved parts4. Recheck before release | 1. Fault location2. Hose filter and bag3. Correction evidence4. Restart conditions | ||||
| 8. Collect and hand over | 1. Dust re-release2. Waste spill3. Defect reused4. Scope lost | 1. Dry sweeping2. Bag not sealed3. Damage unmarked4. Depth not recorded | 1. Use approved vacuum2. Seal and label waste3. Hold defective tools4. Record wall status | 1. Cleanup method2. Waste containment3. Tool disposition4. Area and recipient |
P = likelihood; S = severity; R = risk under the site method; A = site-defined acceptance/authorization. These actual assessment cells are blank. A low score never overrides a missing safeguard or a legal or manufacturer restriction.
4. Fictional scenario and failure mechanisms
This illustration provides educational context. It is not an actual incident photograph or evidence of equipment suitability; any AI-generated depiction is illustrative only.
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Stage | Fictional situation |
|---|---|
| Initial situation | A fictional crew grinds a concrete wall with extraction. |
| Changed condition | The extractor alarms and dust escapes, but only a small area remains. |
| Failure path | The worker continues and tightens a face covering instead of correcting capture. |
| Possible outcome | Dust exposure can increase and spread to adjacent trades. |
| Prevention barrier | Stop grinding, isolate the tool, correct the hose/filter/bag fault and verify the specified controls before a limited restart. |
Failure mechanisms
A connected hose does not prove adequate capture. Check the shroud contact, hose, filter, collection capacity, alarms and required airflow; preserve exposure controls while emptying or servicing the extractor.
Low visible dust does not establish a low respirable-silica exposure. The task, location and total duration determine the applicable control route. Indoor exhaust and a compliant respiratory-protection program may be needed in addition to local capture.
Permission to remove a surface projection does not authorize cutting reinforcement or repairing a structural crack. Hold unexpected depth, cracks, embedded services or unknown coatings. Cleanup must avoid redistributing collected dust.
Work sequence: Define wall scope → Inspect tool isolated → Prepare capture → Position and start → Grind and monitor → Stop and inspect → Hold equipment fault → Collect and hand over. This is a teaching flow, not a device drawing or a complete operating procedure.
5. Conditional decisions and common errors
| Situation | Required action | Evidence | Proceed when |
|---|---|---|---|
| Extractor alarm | Stop and inspect capture | Hose, filter, bag and airflow | Control restored |
| Crack or steel exposed | Hold affected wall | Depth and design review | Scope reconfirmed |
| Unknown coating | Do not grind | Material characterization | Method accepted |
| Cleanup needed | Use controlled collection | Approved vacuum and waste route | Dust contained |
Similar observations, different decisions
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Observation | Insufficient conclusion | Required distinction |
|---|---|---|
| Hose attached | Physical connection | Capture performance remains unproved |
| Little visible dust | Appearance only | Exposure requirements still apply |
| New wheel | Unused consumable | Speed, fit and shroud must match |
6. Roles and responsibilities
| Role | Responsibility |
|---|---|
| Work supervisor | Confirm wall identity and the task scope, resources, interfaces and stop authority. |
| Qualified technical reviewer | Review wheel and model, model limits, compatibility and unresolved technical conditions within assigned competence. |
| Work crew | Apply the listed controls, report changes and stop when evidence or safeguards are missing. |
| Inspector / assessor | Record actual dust and alarm and other relevant checks; do not mark unverified conditions as accepted. |
| Handover authority | Reconcile cleanup method, restrictions and outstanding actions before the next task. Role labels do not establish a legal credential. |
Supervision and handover focus
| Stage | Management action | Evidence |
|---|---|---|
| Define wall scope | 1. Record wall identity2. Record services and cracks3. Record depth and limits | 1. Wall identity2. Services and cracks3. Depth and limits |
| Inspect tool isolated | 1. Record wheel and model2. Record isolation method3. Record cable condition | 1. Wheel and model2. Isolation method3. Cable condition |
| Position and start | 1. Record access condition2. Record grip and stance3. Record hose route | 1. Access condition2. Grip and stance3. Hose route |
| Grind and monitor | 1. Record dust and alarm2. Record noise and vibration3. Record depth and cracks | 1. Dust and alarm2. Noise and vibration3. Depth and cracks |
| Hold equipment fault | 1. Record fault location2. Record hose filter and bag3. Record correction evidence | 1. Fault location2. Hose filter and bag3. Correction evidence |
| Collect and hand over | 1. Record cleanup method2. Record waste containment3. Record tool disposition | 1. Cleanup method2. Waste containment3. Tool disposition |
7. Hold points and record comparison
| Hold point | Evidence before release | Actual approval |
|---|---|---|
| HP-0 Scope | Shallow dry grinding of known uncoated concrete wall projections using a compatible handheld grinder, shroud and dust extractor from stable approved access. | |
| HP-1 Inspect tool isolated | Wheel and model; Isolation method; Cable condition; Shroud fit | |
| HP-2 Position and start | Access condition; Grip and stance; Hose route; Capture at start | |
| HP-3 Hold equipment fault | Fault location; Hose filter and bag; Correction evidence; Restart conditions | |
| HP-4 Collect and hand over | Cleanup method; Waste containment; Tool disposition; Area and recipient |
Hold points are internal project checks. They are not universal statutory permits and do not grant work permission. Reassess after defects, changed conditions and shift changes.
Record comparison
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
The boxes are static record prompts, not interactive or saved approvals. A tick does not establish suitability or permission to restart. Record the evidence, person, time and unresolved issues; retain the change history.
| Record | Insufficient record | Record checklist |
|---|---|---|
| Define wall scope | Only marked “OK” | □ Wall identity□ Services and cracks□ Depth and limits□ Coating assessment |
| Position and start | Only marked “OK” | □ Access condition□ Grip and stance□ Hose route□ Capture at start |
| Hold equipment fault | Only marked “OK” | □ Fault location□ Hose filter and bag□ Correction evidence□ Restart conditions |
| Collect and hand over | Only marked “OK” | □ Cleanup method□ Waste containment□ Tool disposition□ Area and recipient |
8. Site checklist and emergency response
| Site check | Actual result | Person / action |
|---|---|---|
| Define wall scope: Wall identity; Services and cracks; Depth and limits; Coating assessment | ||
| Inspect tool isolated: Wheel and model; Isolation method; Cable condition; Shroud fit | ||
| Prepare capture: Flow and alarm; Hose and filter; Exposure-control route; Respirator program | ||
| Position and start: Access condition; Grip and stance; Hose route; Capture at start | ||
| Grind and monitor: Dust and alarm; Noise and vibration; Depth and cracks; Worker condition | ||
| Stop and inspect: Full stop; Wheel temperature; Surface inspection; Held locations | ||
| Hold equipment fault: Fault location; Hose filter and bag; Correction evidence; Restart conditions | ||
| Collect and hand over: Cleanup method; Waste containment; Tool disposition; Area and recipient |
Stop work
Stop for lost capture, an alarm or dust escape, wheel damage/vibration, unstable access, unknown coating, unexpected cracks, reinforcement or embedded services. Changing the method requires renewed review.
Emergency response
Stop the tool safely and restrict the affected area. Follow the site response for injury or significant inhalation symptoms and obtain medical assistance as needed. Keep responders clear of energized tools and airborne dust; trained personnel manage recovery.
9. Sources and review limits
Public-source access/review: 2026-10-12.
| Official source | Reviewed scope and limits |
|---|---|
| OSHA 1926.1153 | Construction silica: complete applicable Table 1 controls or alternative exposure-control route; housekeeping and written plan. |
| OSHA handheld grinding fact sheet | Official explanatory guidance for tasks other than mortar removal; use current regulation for exact controls. |
No actual equipment model, SDS, site measurements, design calculations or authorization record was supplied. Product-specific limits and methods must be verified before use. Federal OSHA is a baseline within its scope; determine the applicable State Plan and local requirements. Manufacturer guidance is not government approval; an incorporated standard differs from voluntary guidance. No nationwide-compliance or expert-approval claim is made.
10. PDF guidance and FAQ
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
PDFs are complementary six-stage extracts. Apply all eight body stages and the actual equipment/site procedure.
Does a dust mask replace extraction?
No. Select the complete silica control route and required respirator program for the actual task.
Can an air gun clean the wall?
Do not disperse silica dust. Apply the housekeeping restrictions and an accepted vacuum or other permitted method.
Can grinding continue after reinforcement appears?
Hold that area and obtain design/scope review before any further removal.
Has a professional verified or approved this document?
No. Public sources and editorial, layout and consistency checks were reviewed using AI. No site inspection or professional technical approval has been performed. Obtain appropriate professional review before use.
11. Revision history and authorship
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorization are required before use.
| Date | Version | Change | Review status |
|---|---|---|---|
| 2026-10-12 | US 1.0 | New US edition from assigned Korean source; task decisions, records and PDFs localized. | AI editorial review; no professional technical approval |
Korean edition revision dates: 2026-03-02, 2026-08-01, 2026-10-08. US v1.0 adapts the earlier edition to United States requirements and terminology.
Site reviewers must add their actual qualifications, scope, date and approval only after the review occurs.