# Presentation: 561155

## TECHNICALLY ACHIEVABLE, ADMINISTRATIVELY ACHIEVABLE, AND PROMISING NOISE CONTROLS

- 30 CFR PART 62

## PROGRAM INFORMATION BULLETIN NO. P04-18

- Applicable to MSHA enforcement personnel, equipment manufacturers, coal & m/nm mine operators, independent contractors, miners, miners’ representatives, and other interested parties.
- Issued August 2, 2004
- Provide guidance on technologically and administrative achievable engineering and administrative noise controls

## Slide 3

## Slide 4

## PROGRAM INFORMATION BULLETIN (PIB)

- PIB is a listing of technologically achievable noise controls and those found to be “promising”.
- In general “achievable” means capable of being done.
- As used in the PIB, “Noise Controls” are either engineering or administrative controls.
- The noise controls are listed not as a check list, but should be considered for application to specific conditions at a mine.

## NOISE PIB PRESENTATION

- The full presentation is on the CD in your information packet.
- It encompasses both Coal and Metal and Nonmetal mining operations.
- The PIB is in Appendix 5 of Chapter 3 of the “Coal Mine Health Inspections Procedures Handbook.”

## FEASIBILITY

- Feasibility is considered on a **case-by-case basis, based on the conditions at the mine.**
- Technical achievability is part of total feasibility.  **(Feasibility = Technically Achievable +Economic Achievable)**
- An engineering or administrative control is technically achievable if it can reduce noise exposures to the PEL or a 3 dBA equivalent reduction in exposure used either singly or in combination with other engineering or administrative controls.

## TYPES OF CONTROLS

**Achievable Controls** – Known to have a demonstrated effectiveness either singly or as part of a suite of noise controls.
**Conditional Control**
- Its effectiveness is demonstrated dependent on the conditions that exist at the mine site; and
- The installation and use of the control may create a collateral health or safety hazard, which must be addressed.

## TYPES OF CONTROLS

**Promising Controls** – May have a demonstrative effectiveness (lack of evaluation and/or documentation in terms of significant reduction of a miner’s noise exposure either singly or as part of a suite of noise controls).
- With sufficient validation, a promising control may move up the list to be a technically achievable control.

## Slide 10

## Slide 11

## GENERAL 

- The mining **noise standard** is an occupational exposure based standard; PIB is on a machine/equipment basis.
- “APPROPRIATE ACOUSTICAL MATERIALS”
- Selected based on a scientific noise control basis, commensurate to the task.
- Must be **appropriately selected, correctly installed,  and properly maintained**.
- Aware of flammability properties.

## CONTINUOUS MINERS

## CONTINUOUS MINING MACHINES/AUGERS/LOADERS – (Underground)

- Use of remote controls with proper operator positioning;
- Use of treated cutting heads on auger miners (e.g., the application of stiffening gussets to the helix and filling of voids with sand);
- Use of constrained layer damping on the conveyor pan line of auger miners ;
- Proper maintenance (chain tensioning, etc.)
- Limit time conveyor runs without material; and

## CONTINUOUS MINING MACHINES/AUGERS/LOADERS – (Underground)

- Locate the shuttle car change-out point away from major noise sources e.g. auxiliary fan.

## Administrative Controls for Continuous Miners

- Avoid idle parking in high noise areas;
- Keep workers away from auxiliary fans;
- Have mechanics and electricians avoid working near high-noise sources during maintenance;
- Reduce utility man working time near face and auxiliary fan;
- Limit operation of chain conveyors when empty  on all equipment;

## Administrative Controls for Continuous Miners

- Eliminate a high-pitch screech by instructing roof bolters to drill straight holes and to minimize metal strap contact with the drill steel;
- Follow a cutting cycle that minimizes noise generation from both the continuous mining machine and the cutting process (i.e., reduce cutting into roof and floor rock, cutting directly into in-seam rock, and over sumping);

## Administrative Controls for Continuous Miners

- Regulate engine RPMs on diesel-powered shuttle cars during loading and dumping;
- Follow shuttle car loading and tramming procedures that minimize noise (e.g. time that the conveyor chain is running, increase distance from CM and the boom, etc.);

## Administrative Controls for Continuous Miners

- Follow loading and tramming procedures for loading machines that minimize noise ; and
- Turn off any mobile equipment when not in operation .

## AUGER CUTTING HEADS

- Standard

- Modified

## CONSTRAINED LAYER DAMPING TECHNIQUES

## CONTINUOUS MINING MACHINE (Promising)

- Use of a clear barrier between the operator and pan conveyor pan line;
- Use of constrained layer damping on the conveyor pan line for ripper miners;
- Use of sand-filled conveyor decks;
- Insulate/enclose motors and pump housings;
- Use vibration isolation mounts on motors and pumps;
- Use coated flights on chain conveyors;

## CONTINUOUS MINING MACHINE (Promising)

- Rotate center bolter operator with center bolter helper, roof bolter operator with utility men or shuttle car operators, miner bolter operator with loading machine operator, or continuous miner operator with shuttle car operator;

## CONTINUOUS MINING MACHINE (Promising)

- Use of isolated cutting bits; and
- Use of sand-filled cutting heads.

## CONTINUOUS MINER SCRUBBER

- Maintaining proper fan blade clearance .

## CONTINUOUS MINER SCRUBBER (Promising)

- Use a silenced fan housing;
- Use of sleeve-style attenuator;
- Use of alternate face air flow distribution system (fan spray system);
- Use of bolt-on attenuators; and
- Appropriately selected, correctly installed, and properly maintained acoustical materials applied to the dust scrubber.

## UNDERGROUND DIESEL POWERED EQUIPMENT

## DIESEL - UNDERGROUND DIESEL-POWERED EQUIPMENT

- OEM Environmental cabs that include appropriate acoustical materials;
- Use of an exhaust muffler;
- Non-OEM cabs (conditional); and
- Use of appropriate acoustical material to reduce noise from the engine and transmission compartments (conditional).

## CABS 

## CABS

## BARRIERS AND ABSORPTION MATERIALS

## MUFFLERS

## DIESEL - UNDERGROUND DIESEL-POWERED EQUIPMENT

- Redirection of the exhaust away from the operator; and
- Remote Controls.

## MILLS/PROCESSING PLANTS/COAL PREP. PLANTS

## MILLS/PROCESSING PLANTS/COAL PREP. PLANTS

- Acoustically treated control booths;
- Use of full enclosures without a top around equipment or miner work locations;
- Use of partial enclosures without a top around equipment or miner work locations (conditional);
- Acoustic baffles suspended above enclosures (conditional) ;
- Use of resiliently backed mill liners (conditional);
- Use of chute liners (conditional);

## MILLS/PROCESSING PLANTS/COAL PREP. PLANTS

- Use of covered chute enclosures (conditional) ;
- Use of dead boxes and impact pads (conditional) ;
- Use of resilient screen decking (conditional) ;
- Use of electro-mechanical sensing devices to limit exposure times;
- Use of video technology to limit exposure times; and
- Use of bin-level indicators.

## ENCLOSURES AND BOOTHS

- NEED OVERLAP ON CURTAIN

## CONTROL ROOMS

## BAFFLES ABOVE ENCLOSURES

- Topless Enclosure

## CHUTES & DECKING

## REMOTE SENSING

## MILLS/PROCESSING PLANTS/COAL PREP. PLANTS (Promising)

- Replacement of spring mounts with vibration isolation mounts made of rubber, ROSTA mounts, and air bags;
- Use of “double isolation” mounting methods;
- Replacement of large size screens with banana screens.  Applicable where there is no height restrictions.

## VIBRATION ISOLATION

## PLANTS/MILLS ADMINISTRATIVE CONTROLS

- Rotate plant operator with control room operator; inside mechanic with outside mechanics; high-noise floor workers with low-noise floor workers; and in-plant workers with outside-plant workers;
- Limit plant worker time on noisy floors, working in or next to noisy equipment such as screens, crushers, centrifuges, and dryers;

## PLANTS/MILLS ADMINISTRATIVE CONTROLS

- Relocate work stations/controls to quieter locations;
- Relocate tool boxes, cabinets, and supplies to quiet areas;
- Operate noisy equipment/process (welding, grinding, etc) when fewer workers will be exposed; and

## PLANTS/MILLS ADMINISTRATIVE CONTROLS

- Perform maintenance during downtimes, if possible.

## PLANTS/MILLS ADMINISTRATIVE CONTROLS (Promising)

- Move pulp density measuring to quiet location;

## MOBILE EQUIPMENT - SURFACE

## MOBILE EQUIPMENT - SURFACE

- Environmental cabs (equipment since mid-1970s) that include appropriate acoustical materials;
- Use of exhaust mufflers;
- Redirection of exhaust away from the operator
- Installation of a full or partial skin kit to the ROPS/FOPS (conditional); and
- Use of appropriate acoustical materials to treat the operator’s compartment (conditional).

## ENVIRONMENTAL CABS

## REDIRECTION OF MUFFLER

## ENVIRONMENTAL CAB  TREATMENTS

## PARTIAL BARRIER

## MOBILE EQUIPMENT - SURFACE (Promising)

- Use of remote controls.

## REMOTE CONTROL

## Roof Bolter

## ROOF BOLTING MACHINE

- Maintain OEM recommended drilling parameters for thrust, torque, and rotational speed
- Use of wet drilling techniques, when and where feasible (machine design, geology, mining method)

## ROOF BOLTING MACHINE

- Use of sharp drill bits;
- Use of a starter drill steel to begin hole;
- Use of straight drill steel;
- Proper drill maintenance – replace worn or defective parts;

## Roof Bolter

## ROOF BOLTING MACHINE (Promising)

- Use of automated dust collection system or actuation of the dust collection system motors only during drilling, or use of administrative controls to accomplish the same task;
- Use of an exhaust conditioner (water box);
- Use of controls to optimize drilling parameters;

## ROOF BOLTING MACHINE (Promising)

- Use of a water misting system;
- Use of a grommet to isolate the drill steel and chuck;
- Installation of an acoustical liner in the tool tray; and
- Use of damped drill steels.

## A PRACTICAL APPROACH TO REDUCING MINERS’ NOISE EXPOSURE

## A PRACTICAL APPROACH TO REDUCING MINERS’ NOISE EXPOSURE

- Section 2 of the PIB
- Three Areas
- Maintenance (9)
- Work Practices (17)
- Engineering/Administrative Controls (19)
- 45 Questions to consider when addressing a noise control problem.

## A PRACTICAL APPROACH TO REDUCING MINERS’ NOISE EXPOSURE -Maintenance

- Are all existing noise controls maintained?
- Are mechanical components/systems adequately maintained including maintaining and greasing rollers, bearings, etc.?
- Are bolts tight, covers and compartments secure to prevent noise exposures?
- Do smooth transitions exist between rail tracks?

## A PRACTICAL APPROACH TO REDUCING MINERS’ NOISE EXPOSURE – Work Practices

- Are sharp cutting tools used?
- Do dust collection systems operate only when needed?
- Are proper thrust, rotational speed, torque and chain tensioning being used?
- Are good work practices being employed?
- Are there work practices that result in unnecessary exposure?
- Are conveyors operated either wet or with material?

## A PRACTICAL APPROACH TO REDUCING MINERS’ NOISE EXPOSURE – Engr./Admin. Controls

- Are all feasible engineering and administrative controls installed and maintained?
- Are environmental cabs used on surface mobile equipment?
- Can a TV camera/monitor be used to observe critical operations thus limiting a miner’s exposure?

## SOME EXAMPLES OF ADMINISTRATIVE CONTROLS

## MSHA POLICY

- Labor/management agreements will not be affected by the noise standard.
- MSHA will not require an operator to hire additional miners in order to “exhaust” all feasible administrative controls.

## SOME EXAMPLES OF ADMINISTRATIVE CONTROLS

- Adjusting Work Schedules (3)
- Utilize Work Practices to Lower Noise Exposures (10)
- Using Real-Time Noise Dosimetry/ Instrumentation to trigger administrative controls
- Use Remote Sensing Technology
- Designated low-noise areas
- Identify and follow maintenance procedures to reduce noise generation and reduce exposures. (4)

## Feasibility of Noise Controls – Considerations and Resources

## Noise Controls

- The MSHA noise rule discusses two types of noise controls: administrative controls and engineering controls.
- They can be used either individually or in combination.

## Feasibility of Noise ControlsBased On The Federal Mine Safety And Health Review Commission(FMSHRC)

- Reduces exposure
- Is economically achievable
- Is technically achievable

- Secretary of Labor v. A.H. Smith, 6 FMSHRC 199(1984); Secretary of Labor v.
- Callanan Industries, Inc. 5 FMSHRC 1900 (1983)

- Preamble to Noise Standard: FR v64, No. 176/Monday, 9/13/99 PP 49576

## Technically Achievable – It can yield a significant noise reduction.
Economically Achievable – It is economically rational to require the control in order to achieve the reduction. 
Feasible-The control is both Technically and Economically Achievable.

- Economically Achievable – It is economically rational to require the control in order to achieve the reduction.
- Feasible-The control is both Technically and Economically Achievable.

- Feasibility of Noise Controls(FMSHRC)

## Feasibility

- Feasibility = **Technically Achievable** (Engineering and/or Administrative Control) + **Economically Achievable**

## Feasibility of Noise Controls(FMSHRC)

- Sufficient **credible evidence** **of** a miner’s **exposure** to noise levels in excess of the limits specified in the standard.
- Sufficient **credible evidence of** a technologically achievable engineering **control that could be applied** to the noise source.

- Secretary of Labor v. Callanan Industries, Inc. 5 FMSHRC 1900 (1983)

- ...to sustain a citation, the Secretary must provide:

## Feasibility of Noise Controls(FMSHRC)

- Sufficient **credible evidence of** **the** **reduction** in the noise level that would be obtained **through implementation** of the engineering control
- Sufficient **credible evidence** supporting a **reasoned estimate** **of** the expected economic **costs** of the implementation of the control

- Secretary of Labor v. Callanan Industries, Inc. 5 FMSHRC 1900 (1983)

- ...the Secretary must provide:

## Feasibility of Noise Controls(FMSHRC)

- A **reasoned demonstration** that, in view of the previous elements, the **costs** of the control **are not wholly out of** **proportion to the expected benefits.**

- Secretary of Labor v. Callanan Industries, Inc. 5 FMSHRC 1900 (1983)

- ...the Secretary must provide:

## Definition Of “Wholly Out Of Proportion” As Taken From Program Policy Letter No. P04-IV-1 & P04-V-1

- Item #2(c), Under “Feasibility of Engineering and Administrative Controls”
- Whether the committed resources are wholly out of proportion to the expected results
- “If a control is extremely costly for the operator but the expected reduction in noise exposure is minimal, MSHA may determine that it is not economically feasible for you to install the control”

## Control Feasibility

**Achieves Compliance OR**
**Feasible even though it fails to reduce exposure to permissible levels contained in the standard, ****as long as there is a significant reduction in a miner’s exposure****.**

- Todilto Exploration v. Secretary of Labor, 5 FMSHRC 1894, 1897 (1983)

- Preamble to Noise Standard: FR v64, No. 176/Monday, 9/13/99 PP 49576

## MSHA Policy

- MSHA has determined that a 3-dBA reduction in a miner’s exposure is the relevant factor in determining feasibility.

- Preamble to Noise Standard: FR v64, No. 176/Monday, 9/13/99 PP 49576

- Note: A reduction in exposure can be used to evaluate both engineering
-  and administrative controls whereas administrative controls cannot be
-  evaluated in terms of sound pressure level reductions.

## What Can Be Done ?

-    It depends on the situation (Case by case basis)
- Majority of situations will be simple “common sense” solutions  (Mufflers, close doors, close windows, install covers, seal cracks, acoustic materials, limit time, etc)
- Others will be more complex. (Multi-noise sources, covers a large area, mobile occupation)

## What Can Be Done ?

- Is the noise exposure located at an underground mine, surface mine or processing operation?
-   Location may limit options and possibilities
- Visibility, flammability, space and safety
- What is the Noise Dose or SPL ?
-   What is the amount needed for compliance or a significant reduction?
- Minimal reduction generally costs less

## ECONOMIC ASPECTS

## Economic Achievability Examples

- A.H. Smith Stone Company (1984)
- Duininck Brothers, Inc. (1991)
- Explosives Technologies International (1992)

## A.H. Smith Stone Company, 6 FMSHRC 199 (1984) - involving a diesel-powered shovel - the Commission affirmed the ALJ’s finding that MSHA had: 	         

- determined a miner’s noise exposure exceeded the PEL
- shown one or more controls to be technologically feasible
- shown the estimated compliance cost range of $600 to $1400 was not “...wholly out of proportion to the expected benefits.”

## Duininck Brothers, Inc., 13 FMSHRC 1436 (1991) - involving a tractor and a bulldozer – An  ALJ found that the:

- Secretary demonstrated that miners were overexposed to noise
- Secretary demonstrated that a full cab with acoustical treatment was a technologically feasible control
- $10k-$13k cab cost for each machine was not “wholly out of proportion to the expected benefits.”  *(Cost of reduction/ value of machine ratio is not a consideration)*

## Explosives Technologies International 14 FMSHRC 59 (1992) - involving an Atlas hydraulic drill – the Commission found that :

- The Secretary established a prima facie case outlined in the Callanan Industries decision.
- The Secretary demonstrated that the drill operator was overexposed to noise
- The Secretary demonstrated that a partial barrier or full cab with acoustical treatment was a technologically feasible control
- A partial barrier costing $1,000 or a full cab costing $50k-$70k on the drill was a economically achievable control.

## Noise Enforcement Policy Relevant Elements

- “...neither MSHA nor the Commission has placed a value on the cost of a control per decibel of reduction or the number of miners affected, [but] ...MSHA will not require an irrational expenditure to achieve a minimal noise reduction.”  [Feas. 3C]
- “...MSHA will determine whether the cost of abatement is out of proportion to the expected reduction in noise exposure.”  [2C]
- “...MSHA will not require rod and ball mills to be enclosed at costs that could reach hundreds of thousands of dollars.”  [2C]

## Noise Enforcement Policy Relevant Elements

- “...[MSHA] may require that control rooms and other practical controls be implemented to reduce noise exposure.”  [2C]
- “...MSHA will not require [an operator] to hire additional workers in order to “exhaust” all feasible administrative controls.”  [4]

## MSHA may enter into Compliance Action Plans Establishing Abatement Action Timetables 

- Stillwater Mining re noise overexposures
- Malvern Minerals re silica overexposures

## RESOURCES

## Inspector Resources

- Personal Experience
- Fellow Inspectors
**PIB ****(P04-18)**
**PIL ****(P04-IV-1 & P04-V-1)**
**Noise Control Resource Guide**
**MSHA Technical Support Reports**
- Company Mechanics
- Equipment Manufacturers
- Noise Technical Database

**Items In Yellow Are Available From MSHA Homepage **

## Slide 93

## Slide 94

## Slide 95

## Slide 96

## Slide 97

## Slide 98

## Slide 99

## Slide 100

## Slide 101

## Equipment Manufacturers

| Industrial Noise Control, pre-assembled rooms, pulpits, guard booths, portable rooms, portable buildings. |  |  |  |
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|   |                             | Pre-Assembled Rooms |   |

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- To learn more about the INC® Panl-Wall®, _[click here](http://www.industrialnoisecontrol.com/panl.htm)_.
- Investigate other enclosure options at _[Flexible Enclosures](http://www.industrialnoisecontrol.com/flex.htm)_.

|   |  |   |
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| 401 Airport Road • North Aurora, Illinois 60542Phone: (800) 954-1998 • Fax: (800) 420-4928email: sales@industrialnoisecontrol.com
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  Operator pulpit for railroad yard.
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| INC® Pre-Assembled Acoustical Structures® instantly create durable, portable, self-contained, productive work spaces.
Quiet rooms 
Personnel shelters 
Control pulpits 
Test booths 
In-plant offices 
Guard & dispatch booths  |   |                                 Control room for a paper mill. |
| --- | --- | --- |
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| Available in many standard sizes & shapes, these structures are the ideal solution for projects facing limited time, space or funding. Reap benefits such as noise reductions as great as 40 decibels, improved air quality, better security and the ability to control temperature, lighting & humidity levels, all without the inconvenience of on-site construction. And, because they are designed to be portable by fork-lift or crane, INC® Pre-Assembled Acoustical Structures® adapt quickly and easily to changes in facility routines. Custom designed sizes, shapes and configurations, exterior use, etc. are no problem for INC®. |   |                                 Equipment room for pulp mill. |
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|  |   |                                 Enclosure for outdoor municipal well pump. |

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| Operator control room & plant office. |

## Equipment Manufacturers

## PTAD Field Investigations

- _FY__	__	__Total__	__	__Coal__	__	__MNM_
- 	05*		10	         2               8
- 	04		21		10		11
- 	03		20		  2		18
- 	02		**54**		14		40
- 	01		45		  0		45
- * As of March 2005

## Bulldozer - Noise Sources

**Bulldozer - Noise Sources**

**Exhaust          Engine**

**Hydraulics      Transmission     Tracks**

## Bulldozer - Noise Controls

**Bulldozer - Noise Controls**

**Acoustical Materials          Front Panel**

## Front Skin Welded to ROPS

**Front Skin Welded to ROPS**

## Gaps Around

**Gaps Around**
**Cowl Sealed**

## Metal Surfaces

**Metal Surfaces**
**Covered with**
**Acoustical**
**Material**

## Costs

**Front Skin Kit                                  $1210**
**Fiberglass Material                             880**
**Fiberglass Composite                        160**
_**Miscellaneous                                     100**_
**	****	****	****	****	****TOTAL      $2355**

## Retrofit Noise Controls For Drills

**Company Homemade Cab**

## Tamrock CHA-800

**Tamrock CHA-800**
**Drill**

## Slide 114

## Slide 115

## Tamrock CHA-800Drill

**At Operator Controls (Untreated)****	****	****110.5 dBA**
_**Inside Treated Cab**__**	**__**     **__**	**__**	**__**	**__**	**__**  88.8 dBA**_
**Measured Reduction****	****	****	****	****  21.7 dBA**
**Cost of Materials (1994)****	****	****$2,500**

## Acoustic Material Manufacturer - Price List 

- Product		Description	Width	Unbound	Roll	Bound Roll
- _	__	__	__	__	__Price/Sqft__	__	__Price/Sqft_
- Quilted Fiberglass Absorbers
- FF-QA-IVX	1 Layer Faced 	48”	2.28		2.71
- 		one side
- FF-QA-1VX	2 Layer Faced	48”	4.81		5.25
- 		one side
- FF-QA-2VV	2 Layers Faced	48”	5.43		5.86
- 		both sides
- Composite Quilted Fiberglass Absorbers
- FF-BS-IVIV	2 Layers Barrier	48”	8.40		9.01
- 	Septum Faced, Both Sides
- FF-BB-IV		1 Layer Barrier	54”	7.88		8.49
- 	Back, Faced One Side
- FF-BB-2V		2 Layers Barrier	54”	9.54		10.24
- 	Back, Faced One Side

## Aftermarket Cab Manufacturers

- Custom Products of Litchfield, Inc.			Saf-T-Cab, Inc.
- (Custom Made Cabs)				(Large Line of Aftermarket Cabs)
- Box 718					Fresno, California
- Litchfield, Minnesota  53555			209-286-5541
- 612-693-3221
- 800-222-5463
- Sims Manufacturing, Inc			Lake Superior Cabs, Inc.
- (O.E.M. for Cat, J. Deere, Case, etc.)		(Reconditioned Cabs, ROPS, Skin Kits)
- Payne, Ohio				118 West Harney Road
- 419-263-2321				Esko, Minnesota 55733
- 						800-328-1823
- Industrial Cab				Cabs, ROPS & Attachments, Inc.
- 1850 West Oliver Avenue			P.O. Box 158
- Indianapolis, Indiana 46221			Iron River, Wisconsin 54847
- 317-638-8145				800-743-3993

## Air Conditioning Manufacturers For Mobile Surface Equipment

- Red Dot Air Conditioning Inc.			Lintern Corporation
- 495 Andover Park East				(Corrosion Resistant)
- P.O. Box 58270				P.O. Box 90
- Seattle, Washington 98188			Mentor, Ohio 44061
- 206-575-3840				216-255-9333
- 					800-321-3638
- The Birdwell Company				Kysor Industrial Corporation
- 7308 Greenhouse Road			602 East Blackhawk Drive
- Dept. IR					Byron, Illinois 61010
- Houston, Texas 77084				815-234-2811
- 713-492-1786
- 800-237-2095

## Proposed Database

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Engineering Noise Control Documentation For Bulldozers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|   |   |  |   |   |  | Dosimeter Results |  |  |  |  |  |  |  | Sound Pressure Level Results (dBA) |  |  |  |  |
| Documentation | Manuf. |  | Model |   |  | Run 
Time |  | Before 
Control |  | After 
Control |  | Difference |  | Before 
Control | After 
Control |  | Difference |  |
| Number |   |  |   | Date  |  | min. |  | Dose (%) |  | Dose (%) |  | Dose (%) |  | SPLA | SPLA |  | SPLA |  |
| 1 | Caterpillar |  | D8K | 8/12/2001 |  | 570 |  | 220 |  | 115 |  | 105 |  | 94.4 | 89.8 |  | 4.6 |  |
| 2 | Caterpillar |  | D9H | 10/14/2001 |  | 660 |  | 285 |  | 102 |  | 183 |  | 95.4 | 88.0 |  | 7.4 |  |
| 3 | Terex |  | 8350 | 7/7/2003 |  | 540 |  | 140 |  | 56 |  | 84 |  | 91.6 | 85.0 |  | 6.6 |  |
| 4 | Allis-Chalmers |  | HD-41 | 6/19/2003 |  | 630 |  | 225 |  | 89 |  | 136 |  | 93.9 | 87.2 |  | 6.7 |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Average |  |  |  |  |  | 600.0 |  | 217.5 |  | 90.5 |  | 127.0 |  | 93.8 | 87.5 |  | 6.3 |  |
| Standard
Deviation |  |  |  |  |  | 54.8 |  | 59.5 |  | 25.3 |  | 43.0 |  | 1.6 | 2.0 |  | 1.2 |  |

## Slide 121

|  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- |
| Engineering Noise Controls Documentation |  |  |  |  |  |
|  |  |  |  |  |  |
|   |   |   |   |   |   |
| Type(s) Of Noise Controls(Brief) | Cost of Noise Controls | Cost of Noise Controls | PTAD-MSHA Report Number | Location  | Mine |
|   | Materials | Labor |   | State | Name |
| Door seals, exhaust, floor material | $810 | $250 | PP-014-01M | WV | ABC |
| Add material to inside of cab, lower CB & stereo | $500 | $200 | PP-013-01C | PA | DEF |
| Re-line cab with acoustical materials and door seals | $900 | $300 | PP-013-03C | PA | GHI |
| Re-line cab with acoustical materials, fix Air cond. | $2,500 | $500 | PP-012-03M | WY | JKL |
|  |  |  |  |  |  |
|  |  |  |  |  |  |
| Average | $1,177.50 | $312.50 |  |  |  |
| Standard Deviation | $898.16 | $131.50 |  |  |  |

## Suggested Approach for Success

- identify the offending noise source(s)
- quantify the contribution of each source
- review the range of engineering and administrative control options
- install/adopt the most-cost-effective control(s)
- consider/adopt changes in work practices
- above all, use common sense!

## Slide 123