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Geosyntec'' consultants • UN-approved 55-galon drums will also be inspected to ensure each drum includes a resealable lid with a small resealable sampling port near the top,or on the side of the drum and that the enclosure is not deformed and/or distorted; • Drums will not be completely filled to allow for possible expansion of liquid and will be set on wooden pallets to facilitate transport by forklift; • The storage area will be inspected to check for leaks weekly while the containers are being filled and immediately after a relocation to a temporary on-site storage area; and • Flat areas will be selected for temporary storage away from high-traffic work areas/zones and storm/sewer drains. In the event of an unplanned release or spill of unknown or hazardous substances, the site supervisor will designate personnel who will support the spill containment, control, and/or clean- up procedures. The team will request additional off-site emergency response assistance if necessary based on the type of spill, volume, potential toxicity, etc. The spill area will be isolated and restricted to only authorized personnel designated to assist with the containment, control, or clean-up activity. Authorized personnel will be trained to contain and clean spills from typical materials and quantities used at the project location. Physical barriers will be set up to warn unauthorized personnel to stay clear and evacuate the affected area. The spill, leak, or incident will be assessed by the team and characterized to determine the appropriate course(s) of action(s)to consider: • Small spills(i.e., maximum volume of 55 gallons of a liquid or 100 pounds of a solid)may be remediated using absorbent materials by designated personnel; • Large spills (i.e., liquid volumes greater than 55 gallons or solid weights greater than 100 pounds)and/or spills of highly toxic materials may require assistance by off-site hazardous materials(HAZMAT)teams; • Attempts shall be made to identify and stop the source(s) of spillage immediately while donning proper PPE (based on action levels and the air monitoring program) and performing air monitoring; • The site supervisor will direct spill-response operations and stay at the spill area until it has been cleaned, inspected, and cleared for re-entry; and • The site supervisor will prepare a spill incident and clean-up report and will communicate findings to the Project and Branch Manager and H&S Department. 17. CONFINED SPACE ENTRY SAC I I IT HASP—Revision—October 2020 19 10/22/20