COMPLIANCE INFO_FILE 2 - Laserfiche WebLink

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The hazards associated with this task include possible inhalation and skin contact with tank contents. Personnel will wear protective equipment and follow safety procedures while performing the work. Physical hazards are described on Page 10. Tank Purging If the tank contains flammable vapors in excess of 10 percent of the Lower Explosive Limit (LEL), solid carbon dioxide (dry ice) will be used to purge the tank. Tank purging will be performed at least 2 hours before tank removal. The tank will be filled with at least 15 pounds of dry ice per 1,000 gallons of tank volume. During purging, the LEL will be measured through the vent pipe opening in order to determine when explosive vapor levels fall below 10 percent of the LEL. Potential hazards associated with tank purging including inhalation and contact with tank contents as well as typical physical hazards. Personnel will use air monitoring instrumentation to determine explosive levels and toxic vapor concentrations at the breathing zone; personal protective equipment (PPE) to prevent skin contact and inhalation hazard; and standard safety procedures to minimize unanticipated hazards during this activity. Soil Excavation A backhoe will be used to excavate soil to a distance of 3 feet around the perimeter of the tank. Soil and gravel material will be removed and placed on plastic sheeting on the side of the excavation. The polyethylene sheet lining the tank backfill area will also be removed and placed on plastic sheeting. Clean material suitable for backfill will be kept separate from possible contaminated materials. Potential hazards associated with the soil excavation task include inhalation and contact with contaminated soil. Physical hazards due to the proximity of heavy equipment as well as typical construction physical hazards are described on Page 10. Personnel will wear appropriate PPE and will respect site entry and standard safety procedures described in Attachment 4 of this HSP. A-3