Surface Air Track Drill Scenario - Centers For Disease .

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Surface Air Track DrillScenarioSurface Drill ScenarioSalt Lake City, UT

Known: Equipment Surface Limestone Mine33 Year Old Air Track Drill38 foot long holes using four 12 foot long drill steelsNo automatic drill steel changerApproximately 22 holes per shift15-20 minutes per hole (2 min includes tram & setup)Normal work-shift is 8 hours.Generally drilling on uneven or sloped surfacesSurface Drill ScenarioSalt Lake City, UT

Known:1.2.3.4.5.6.Dose for 8-hour work shift is between 352% to 378%Company has installed 3-engineering noise controls to thedrill.Operator ear sound levels:95.5 dBA while tramming 109.4 dBA while drilling Other sound levels:119.3 dBA in front of barrier 108.5 dBA to 96.5 dBA away from controls at 3-feet incrementsDrill operator is enrolled in a HCPDual Hearing Protection Being WornSurface Drill ScenarioSalt Lake City, UT

Known: EquipmentSurface Drill ScenarioSalt Lake City, UT

Known: Equipment-Current Noise controls1. Hammer of drill is wrapped with ⅜ -inchconveyor belting.2. ⅜ -inch conveyor belting barrier is installedbetween drill controls and drill hammer.3. Two of the drill control air exhaust ports arererouted to the rear of the drill via hose.Surface Drill ScenarioSalt Lake City, UT

Known: Equipment-Current Noise controlsDrill Hammer WrappedSurface Drill ScenarioSalt Lake City, UT

Known: Equipment-Current Noise controlsBarrier / ShieldSurface Drill ScenarioSalt Lake City, UT

Known: Equipment-Current Noise controlsDrill Control Exhaust DirectedTo Rear Of DrillSurface Drill ScenarioSalt Lake City, UT

High Wall AreaAir Compressor 45 Feet AwayAir Hose119.4 dBA InFront Of Barrier109.4 dBABehind BarrierNote: Generally a pickup truckis located approximately 30-50 feetfrom drill.3’108.5 dBA6’107.9 dBA9’106.2 dBATramControls95.5 dBA 10’ FromRear Of Drill12’ 105.1 dBA15’ 102.6 dBA18’99.9 dBA21’97.9 dBA24’96.5 dBASurface Drill ScenarioSalt Lake City, UT

56: AM406: AM557: AM107: AM257: AM407: AM558: AM108: AM258: AM408: AM559: AM109: AM259: AM409: AM5510 AM:1010 AM:2510 AM:4010 AM:5511 AM:1011 AM:2511 AM:4011 AM:5512 AM:1012 PM:2512 PM:4012 PM:551: PM101: PM251: PM401: PM552: PM10PM6:2Sound Pressure Level In dBASurface Air Track Drill Dosimeter Data120Range of noise levels during drill cycles (94 to 107 Dba)11010090807060TimeSurface Drill ScenarioSalt Lake City, UT

Exposure me(min)4430406Level(dBA) 93 80 100.5Dose(%)142362Drilling Solutions:1. Is there another, quieter drill on the property that can do thejob?2. Replace the old drill with a new drill that is manufacturedwith an operator’s enclosure?3. Improve upon current noise controls 3 dBA97.5 dBA for 406 min. 239 %4. Use 3-sided portable enclosure for the operator 10 dBA90.6 dBA for 406 min. 91.9 %Surface Drill ScenarioSalt Lake City, UT

Enclose Hammer Inside AcousticallyTreated Structure 3.0 dBACost 500Surface Drill ScenarioSalt Lake City, UT

Properly Installed Air Muffler andRelocate Exhaust Away From Operator 3.0Cost 1000Surface Drill ScenarioSalt Lake City, UT

Extending Barrier To Entire Drill Mast 3.0Cost 500Surface Drill ScenarioSalt Lake City, UT

3-Sided Portable Enclosure 10.0Cost 1000Surface Drill ScenarioSalt Lake City, UT

Raw Data-3 dBA-6 dBA132 % MSHA Citation ValueTime Of PEL-10 2510:9:55AMAMPM11:27 am9:32 am9:25AM8:55AM8:25AM7:55AM7:25AM8:37 1201008060402006:25Cumulative Dose In PercentSurface Air Track Drill OperatorWith Projected Amounts Of ReductionTime Of ShiftRaw Data-3 dBA-6 dBA-10 dBASurface Drill ScenarioSalt Lake City, UT

Projected Noise Exposure Results Based On dBA ReductionAmounts Using Engineering/Administrative Noise ControlsDrilling Reduced By; (For 406 Minutes)100.5 – 1 99.5 dBA“ – 2 98.5 dBA“ – 3 97.5 dBA“ – 4 96.5 dBA“ – 5 95.5 dBA“ – 10 90.5 dBA“ – 12 88.5 dBAFinal Shift Dose%332 (-46%)291 (-87%)255 (-123%)224 (-154%)197 (-181%)108 (-270%)20 (-358%)Original Full-Shift Of 378 %Surface Drill ScenarioSalt Lake City, UT

Alternative SolutionsSurface Drill ScenarioSalt Lake City, UT

TamrockCHA-800DrillSurface Drill ScenarioSalt Lake City, UT

Surface Drill ScenarioSalt Lake City, UT

Surface Drill ScenarioSalt Lake City, UT

Tamrock CHA-800 DrillAt operator Controls (Untreated)Inside Homemade CabReduction110.5 dBA88.8 dBA21.7 dBACost of Homemade operator cab could be 1000Surface Drill ScenarioSalt Lake City, UT

Tamrock Trimmer 100 DrillEnclosure Around MastSurface Drill ScenarioSalt Lake City, UT

Operating Drill WithUmbilical Cord RemoteSurface Drill ScenarioSalt Lake City, UT

Surface Drill ScenarioSalt Lake City, UT

Atlas Copco Surface Drill RigThe Silenced ROC D7CSurface Drill ScenarioSalt Lake City, UT

Atlas Copco Surface Drill RigThe Silenced ROC D7CSurface Drill ScenarioSalt Lake City, UT

Atlas Copco Silenced ROC BrochureSchhh ! Low noise crawler at work! Atlas Copco’s first silenced surface drill rig is a soundinvestmentAtlas Copco, the leading drill rig manufacturer, is set to launch the world’s first ROC series surface drillrig with a substantially reduced noise level making it the quietest-running rig of its kind. The SilencedROC, which will be introduced in September 2005, has a noise level of approximately 10 dB(A) belowthat of other rigs on the market, which enables it to be used in very restricted worksites in urban areas.Combined with lower fuel consumption and increased drilling capacity, the new Silenced ROC –designated as an option on ROC D7 C – represents a major step forward for the drillers’ workingenvironment and an ideal choice for small and medium-sized quarries and civil engineering work sites.Noise a key factorIn many countries, strict noise restrictions are imposed for drilling in urbanareas. This presents new opportunities for companies using Atlas Copco’s new Silenced ROC. The rig’sSilencing Kit reduces the noise level by more than 10 dB(A) which makes it possible to drill virtuallyanywhere.- Atlas Copco has a clear strategy when it comes to environmental and safety issues, says AndersHedqvist, D&D Manager Atlas Copco Surface Drilling Equipment. We are in the forefront of thedevelopment and the Silenced ROC plays an important role in this work. In the future, people who livenear a quarry or construction site will have quieter surroundings.Drilling noise is generated by vibration in the drill steel, feed system, boom and body of the rig. Theadvanced silencing system consists of many components which reduce the overall noise level, but themost noticeable is the hood that covers the mast.Surface Drill ScenarioSalt Lake City, UT

Operator Controls RelocatedInside of CabSurface Drill ScenarioSalt Lake City, UT

Mine Safety and Health AdministrtionPittsburgh Safety and Health Technology CenterPhysical and Toxic Agents Division412-386-6933

Surface Drill Scenario Salt Lake City, UT Known: Equipment Surface Limestone Mine 33 Year Old Air Track Drill 38 foot long holes using four 12 foot long drill steels No automatic drill steel changer Approximately 22 holes per shift 15-20 minutes per hole (2 min includes tram & setup) Normal work-shift is 8 hours. Generally drilling on uneven or sloped surfaces

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