redact government document cover another scandal obama transparent government ever .internal document release late friday show managers u.s. environmental protection agency aware potential catastrophic blowout abandon mine could release large volumes wastewater lace toxic heavy metals.epa release document follow weeks prod associate press media organizations epa contract workers accidentally unleash million gallons contaminate wastewater aug. inspect idle gold king mine near silverton colorado.among document june 2014 work order plan cleanup note old mine accessible since 1995 entrance partially collapse plan appear produce environmental restoration private contractor work epa condition likely cause impound water behind collapse report say ln addition collapse within work may occur create additional water impound condition condition may exist could result blowout blockages cause release large volumes contaminate mine water sediment inside mine contain concentrate heavy metal subsequent may 2015 action plan mine also note potential blowout.there least three ongoing investigations exactly epa trigger disaster taint rivers colorado new mexico utah lead arsenic contaminate epa say water test show contamination level since fall back pre-spill level though experts warn heavy metal likely sink mix bottom sediment could someday stir back up.the document agency release 10:30 p.m. eastern time include account happen immediately spill wastewater flow tributary animas san juan rivers turn sickly yellow.elected officials affect state elsewhere highly critical epa initial response among unanswered question take agency nearly day inform local officials downstream communities rely rivers drink water.much text document release friday redact epa officials among items black line 2013 safety plan gold king job specify whether workers require phone could work remote site 11,000 feet mountain.epa immediately respond friday night question ap wake spill typically take days get detail response agency all.on website contractor environmental restoration post brief statement last week confirm employees present mine spill occur company decline provide detail say would violate contractual confidentiality obligations via ap news break watchdog document prove epa know potential catastrophic blowout toxic waste co mine