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Feature # <br />Closure Method <br />Cost <br />407 <br />Polyurethane foam (7 cubic yards) <br />$1,450 <br />408 <br />Concrete panels (1 panel) <br />665 <br />409 <br />Concrete panels (1 panel) <br />515 <br />410 <br />Concrete panels with grate <br />2,702 <br />(4 panels) <br />411 <br />Polyurethane foam with vent <br />1,050 <br />(7 cubic yards) <br />412 <br />Backfill (45 cubic yards) <br />650 <br />413 <br />Backfill (55 cubic yards) <br />770 <br />414 <br />Concrete panels (2 panels) <br />1,140 <br />415 <br />Concrete panels (3 panels) <br />1,720 <br />416 <br />Concrete panels with grate <br />1,857 <br />(3 panels) <br />417 <br />Concrete panels (2 panels) <br />1,280 <br />418 <br />Backfill (65 cubic yards) <br />910 <br />419 <br />Backfill (250 cubic yards) <br />3,500 <br />421 <br />Backfill (30 cubic yards) <br />420 <br />428 <br />Backfill, monolithic concrete plug <br />1,870 <br />TOTAL <br />$111,089 <br />