Bonanza cleanup

Summary

B9na~~.a clea;nup, '· . Background 1• • • 12 adit and reconstruct the ponal · The lates t,. of several area,andconductgeologicreconnais- CERCLA removal actions within the sance back to a possible plug loca· , BonanzaMiningAreaCERCLASilo .'tion approximately 3500' into the •wai initiated by priv~e parti~; p!in:. · ad it. Safe recpnnnissance of the ad it cipally ASARCO,Inc., under F;orest requires installation of ventilation Service CERCLA authority and over- and lighting systems, mucking out sight, otthe Rawley 12 MiUsitein the debris,lllld retimbering'and rock bolt- summer of 1996. This work contin- ing the roof of the adit. ues the successful, cooperative effons , The ponal pond was com· of private panics, the,EP~. the State' pleted on schedule and has been func- of Colorado, lllld the Rio Grande tioning since September, 1996 when National Forest to ,address environ· the ad it ponnl was also successfully mental problems related to historic,, opened and req>nstructed. Work on mining in the Bonanza area. The the ponal pond included construction Rawley 12 Millsite Operable Unit is of a water treatment system for pH located in Squirrel Gulch about one adjustment, and although used ini· mile nonh of the Town of Bonanza. tinily upon opening the adit, the pH Previous work includes ongoing, of the water flowing into and out of

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