Safety 1st Advancer Návod k obsluze stáhnout pdf (Strana 60)

Environmental Remediation Drilling

Safety Guideline

Page 60 of 132

4.5.19 - Special Precautions for Drilling in Landfills

In addition to the usual physical hazards of drilling, employees drilling in landfills may experience an

increased hazard from methane gas. Methane, a decomposition product of organic materials is a very

flammable gas, which may accumulate in the borehole or in the general work area. To help reduce the

hazards due to the presence of methane while drilling in landfills, the following procedures should be

implemented:

• No smoking within 75 feet from the drilling area.

• The drilling rig should be equipped with a spark-arresting muffler; a diesel engine can sometimes be

preferred.

• All ignition sources should be at least 75 feet from the borehole and, if possible the rig should be located

upwind of the borehole,

• Monitor methane concentrations as frequently as possible using a Combustible Gas Indicator (CGI).

o The frequency of monitoring must be established in the Site-Specific (HASP).

o The meter should be kept near the rig.

o Results of the monitoring data should be entered into the field log,

o Calibrate the CGI against a reference gas at least weekly.

• All work will stop if gases are detected at 10 percent or greater of the lower explosive limit (LEL)

in the hole being drilled.

• Under such circumstances it may become necessary to inert, ventilate, or flood the borehole with water

during drilling to reduce the risk of down-hole explosions.

4.5.20 - Lighting

Lighting around a drilling operation should be sufficient to provide illumination at all times. See the table

below for guidance.

Table 4.2 - Minimum Illumination Intensities in Foot-Candles

Foot-Candles Area of Operation

5 Foot-Candles General construction area lighting.

3 Foot-Candles

General construction areas, concrete placement, excavation and waste

areas, access ways, active storage areas, loading platforms, refueling,

and field maintenance areas.

5 Foot-Candles Indoors: warehouses, corridors, hallways, and exit ways.

5 Foot-Candles

Tunnels, shafts, and general underground work areas: (Exception:

minimum of 10 foot-candles is required at tunnel and shaft heading during

drilling, mucking, and scaling. Bureau of Mines approved cap lights shall

be acceptable for use in the tunnel heading)

10 Foot-Candles

General construction plant and shops (batch plants, screening plants,

mechanical and electrical equipment rooms, carpenter shops, rigging lofts

and active store rooms, mess halls, and indoor toilets and workrooms.)

30 Foot-Candles First aid stations, infirmaries, and offices.

NOTE: The above are minimum requirements. Many circumstances, including weather, may

warrant higher lighting values.

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