RESPIRABLE CRYSTALLINE SILICA

Transcription

1 March 3, 2017 RESPIRABLE CRYSTALLINE SILICA 113 DAYS TO COMPLY

2 AGENDA History What it looks like What you need to do Compliance options Application example Health effects 2

3 ABOUT SILICA Silica, crystalline silica, quartz are used interchangeably 3 forms of crystalline silica: quartz, cristobalite, tridymite Crystalline means that atoms and molecules make up a three-dimensional, indefinitely repeating pattern All other types of silica that don t have this crystalline pattern are considered amorphous Concern: 1-10 microns 1 micron = 1/25,000 th of an inch 3

4 The longest word in the English language dictionary is: pneumonoultramicroscopicsilicovolcanoconiosis A word that refers to a lung disease contracted from the inhalation of very fine silica particles, specifically from a volcano; medically, it is the same as silicosis. 4

5 HISTORY 5

6 NEW PERMISSIBLE EXPOSURE LIMIT (PEL) OSHA Construction (250 mppcf) (%SiO2+5) 100% SiO 2 = 2.4 mppcf PEL = 250 µg/m 3 OSHA General Industry (10mg/m3) (%SiO2+2) 100% SiO 2 = 0.1 mg/m3 PEL = 100 µg/m 3 Construction & General Industry 50 µg/m 3 PEL (0.05 mg/m 3 ) 25 µg/m 3 Action Level (based completely on respirable crystalline silica rather than total respirable dust) 7

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10 Compare to 50 µg/m 3 11

11 WHAT IT LOOKS LIKE 12

12 GREEN = ANNUAL RED = DAILY 13

13 WHAT YOU NEED TO DO 14

14 CONTROLS AND COMPETENT PERSON Controls: at or above AL Dust controls = substitution, isolation, ventilation, wet methods Use any engineering or work practice controls to limit exposures to the PEL (flexible) Where controls and work practices don t reduce <PEL: respirators Designate a competent person Knowledge and experience to identify when exposure is reasonably expected to exceed PEL Make frequent and regular inspections of job sites, materials, and equipment to implement the written exposure control plan 15

15 RESPIRATORS AND WRITTEN PLAN Respirators medical evaluation, fit test, training, program Required for employees exposed over the PEL For employees engaged in the task; reason for regulated areas Recommendation: get started with medical evaluations right now so you re ready to respond Written exposure control plan (task specific) The plan must describe: Tasks involving exposure to respirable crystalline silica Engineering controls, work practices, and respiratory protection for each task Housekeeping measures used to limit exposure Procedures used to restrict access, when necessary to limit exposures 16

16 REGULATED AREAS, MEDICAL SURVEILLANCE, HOUSEKEEPING Establish regulated areas, or write an access control plan (>PEL) The option is based on moving or changing workplaces. Black & Veatch Purpose: make employees aware of RCS levels >PEL and keep exposure to minimum Signs, barricades, lines, textured flooring, etc. (flexible) Regulated area considerations: work upwind, ventilation, adjacent contractor, etc. Medical surveillance Required for employees wearing a respirator, due to being exposed over the PEL, >30 days/yr Offered w/in 30 days of initial assignment, redone every 3 years Housekeeping No dry sweeping or compressed air to clean surfaces unless equipped with ventilation system Gross contamination of clothing: issue coverall 17

17 TRAINING AND RECORDKEEPING Training For all employees subject to exposure at or above the action level Health hazards (cancer, lung effects, kidney effects), tasks, protections, med surv. Demonstrate knowledge can be accomplished through discussion, written tests or oral quizzes (flexible) If video or computer-based programs are used, a qualified trainer must be available to address questions after the presentation, or provide a phone hotline for direct access to a trainer. Recordkeeping Employee silica exposure and medical exams 18

18 SUMMARY OF WHAT YOU NEED TO DO ABOVE ACTION LEVEL: Written exposure control plan Competent person Dust controls Train workers Keep records ABOVE PERMISSIBLE EXPOSURE LIMIT: Regulated areas, or written access control plan Respirators Medical surveillance (>30 days/yr) 19

19 COMPLIANCE OPTIONS 20

20 EXPOSURE ASSESSMENT OPTIONS (3) Initial exposure assessment required if exposures are or may reasonably be expected to be at or above action level of 25 µg/m3 1. SCHEDULED MONITORING (true exposure assessment) 2. PERFORMANCE OPTION (alternative exposure control methods) Representative data Objective data 3. SPECIFIED EXPOSURE CONTROL METHOD = Table 1 21

21 SCHEDULED MONITORING (HANG A PUMP) <AL = You re done AL PEL = Keep sampling ( to or below PEL ) Every 6 months, or Until 2 consecutive samples come back below the AL Modify your controls >PEL = Keep sampling Sample again every 3 months Until 2 consecutive samples come back below the AL Modify your controls 22

22 ALTERNATIVE EXPOSURE CONTROL METHODS Representative data Sample results from same: job function, shift or work area, conditions Sample highest exposure reasonably expected Full shift 8-hour TWA No more than 12 months old Objective data Can use: industry-wide surveys, risk assessment calculations, studies on previous monitoring, or other sources Written exposure control plan and recordkeeping Must still reevaluate upon change in production, process, controls, tools or work practices. 23

23 SPECIFIED EXPOSURE CONTROLS (TABLE 1) PRESUME that you re exposed above the PEL. 18 common operations that include controls, work practices and respiratory protection If you choose Table 1, you DO NOT have to: Comply with the PEL Do exposure assessments for employees Recordkeeping: how long, who, tool, how, type of respirator, etc. Get ready for medical surveillance. 24

24 SPECIFIED EXPOSURE CONTROL METHODS (TABLE 1) Stationary masonry saws Handheld power saws Handheld power saws for fiber cement board Walk-behind saws Drivable saws Rig-mounted core saws or drills Handheld and stand-mounted drills Dowel drilling rigs for concrete Vehicle-mounted drilling rigs for rock and concrete Jackhammers and handheld powered chipping tools Handheld grinders for mortar removal (tuckpointing) Handheld grinders for other than mortar removal Walk-behind milling machines and floor grinders Small drivable milling machines Large drivable milling machines Crushing machines Heavy equipment and utility vehicles to abrade or fracture silica materials Heavy equipment and utility vehicles for grading and excavating 25

25 COMBINING TASKS IN TABLE 1 Employees who engage in 2 or more operations from Table 1 for more than 4 hours a shift, use the >4 hr/day column Example: Stationary masonry saw 3 hours and tuckpointing 2 hours in the same shift No respirator for 3 hours sawing PAPR for 2 hours tuckpointing 26

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27 APPLICATION EXAMPLE 28

28 VIDEO SCENARIO 29

29 SPECIFIED EXPOSURE CONTROL METHODS (TABLE 1) Stationary masonry saws Handheld power saws Handheld power saws for fiber cement board Walk-behind saws Drivable saws Rig-mounted core saws or drills Handheld and stand-mounted drills Dowel drilling rigs for concrete Vehicle-mounted drilling rigs for rock and concrete Jackhammers and handheld powered chipping tools Handheld grinders for mortar removal (tuckpointing) Handheld grinders for other than mortar removal Walk-behind milling machines and floor grinders Small drivable milling machines Large drivable milling machines Crushing machines Heavy equipment and utility vehicles to abrade or fracture silica materials Heavy equipment and utility vehicles for grading and excavating 30

30 SECTION 6 DIVIDER SLIDE 31

31 SCHEDULED SAMPLING 32

32 PERFORMANCE OPTION USE A DUST METER: TSI DUSTTRAK MODEL

33 OBJECTIVE DATA SCENARIO Screening sampling allows a snapshot that can relate to daily exposure. Must know: % silica and time on task Concrete /thermal grout mixture has 60% silica (weight of sand/total weight of all components) 7 hours on this task/day 34

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35 50 ug/m3 = mg/m3 Objective Data 7 hour exposure Reading mg/m3 7hr PEL X PEL X AL Details min post exit 15 min post exit

36 SAFETY NOW Controlling Chemical Exposures at Hazardous Waste Sites with Real-Time Measurements Christopher Marlowe, CIH A Publication of the American Industrial Hygiene Association 37

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