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11. Upon completing excavation of the portal hole (Task 5, Portal Repair and Rock Apron), <br />PROJECT MANAGER may determine that a polyurethane foam (PUF) closure is warranted. <br />If required by PROJECT MANAGER, CONTRACTOR will provide and install 10 cubic yards <br />of Polyurethane foam (PUF), in accordance with Specification 9 of the General Bid <br />Specifications, Colorado Inactive Mine Reclamation Program, 2006. Following installation, <br />the PUF must be covered with minimum 3 feet rock cover using onsite fill material. <br />10 <br />