If a limit is exceeded, all blasting is suspended until a person meeting the s. 21.91(a) qualifications
has determined why and updated the plan if necessary (s. 21.92). Stated here before it happens.
Demo states
Plan limits
| PPV | ≤ 3.0 mm/s |
| Frequency response | recorded |
| Air overpressure | recorded |
Seismograph — BL-14within limits
| Unit | SG-2 · ISRM conformant |
| Placement | 42 m from blast, 8 m from the nearest structure, not directly above |
| Longitudinal | 2.1 mm/s |
| Transverse | 1.7 mm/s |
| Vertical | 1.4 mm/s |
| PPV — max vector sum | 3.0 mm/s — at limit |
| Frequency | 18 Hz |
All three components are retained, because PPV is defined as the maximum vector sum of three mutually perpendicular components.
🛑 Limit exceeded — Vernon 35th StBLASTING SUSPENDED
PPV 4.1 mm/s > plan limit 3.0 mm/s · recorded 27 Aug 11:04
A persistent banner appears on every screen, not just this one. The suspension clears only when a determination is recorded.
Recorded, with the qualifying person named. The written plan is versioned if it was updated.
Air overpressure
| Measurement | recorded |
| Permanent record | signed dated |
| Submittal | due in 6h · SS 204.04.12 |
Interpretation
Vibration specialistawaited
Due within one day of the blast, alongside the records. Qualification basis: ≥5 consecutive years in vibration monitoring on ≥3 projects.
Chase recorded with date, method and person.
Files accepted as an instrument export or a photograph — how this data arrives today is an open question.
Layout as specified in SCR-023-monitoring-records.md
┌──────────┬────────────────────────────────────────────────────┐ │ NAV │ ‹ BL-14 Monitoring ⏱ due in 6h │ │ ├────────────────────────────────────────────────────┤ │ │ PLAN LIMITS (close-proximity written plan) │ │ │ PPV ≤ 3.0 mm/s · frequency ____ · air OP ____ │ │ ├────────────────────────────────────────────────────┤ │ │ SEISMOGRAPH unit SG-2 · ISRM · placed 42 m from │ │ │ blast, 8 m from the nearest structure, not above │ │ │ longitudinal 2.1 mm/s │ │ │ transverse 1.7 mm/s │ │ │ vertical 1.4 mm/s │ │ │ PPV (max vector sum) 3.0 mm/s ⚠ AT LIMIT │ │ │ frequency 18 Hz │ │ │ file ▨ seismograph export photo ▨ │ │ ├────────────────────────────────────────────────────┤ │ │ AIR OVERPRESSURE ____ dB(L) │ │ │ permanent record signed ☐ dated ☐ │ │ ├────────────────────────────────────────────────────┤ │ │ INTERPRETATION — vibration specialist │ │ │ ◷ AWAITED · due within one day of the blast │ │ │ ____ · ≥5 yrs on ≥3 projects (SS 204.04.04) │ │ ├────────────────────────────────────────────────────┤ │ │ IF A LIMIT IS EXCEEDED → ALL BLASTING SUSPENDED │ │ │ until a person meeting s. 21.91(a) determines why │ │ │ and updates the plan if necessary (s. 21.92) │ └──────────┴────────────────────────────────────────────────────┘
Implements spec/03-screens/SCR-023-monitoring-records.md · SCR-023 · URL /projects/{project}/blasting/{blast}/monitoring · Personas TECH, BLAST · Stories US-TECH-006, US-BLAST-010