2020-12-02_PERMIT FILE - M2020061

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10/8/2020 Federal Register::National Oil and Hazardous Substance Pollution Contingency Plan:Partial Deletion of the California Gulch Superfund... long-term implementation of the selected remedy for the OU1.The OUi Work Plan,CP and the RMP are appendices to the 20o8 CD. Routine O&M includes repairing grouted areas of structures due to corrosion,settlement or other factors; occasional repair or replacement of monitor well pumps and surface water monitoring equipment;repair of access roads;routine repair or replacement of pumps,motors,mixers,piping and tankage;and inspections. The treatment plant operates under requirements established in the OU1 Work Plan,and submits monthly and annual reports to EPA.Resurrection/Newmont summarizes monitoring data and data evaluation required by the OU1 Routine Monitoring Plan in the Annual Monitoring Reports,Yak Tunnel System for the Yak Tunnel Operable Unit,Leadville,CO.Current reports and associated data are available by contacting EPA Region 8. In regards to ICs,environmental covenants for Resurrection/Newmont's properties within OU1 were recorded with the Lake County Clerk and Recorder on July 31,2012 and October 10,2012.The environmental covenants provide the following Use Restrictions:(1)No Residential Use,Day Care Centers or Schools,Parks or Open Space that are designed or intended to provide play or recreation areas for children, (2)Restrictions on using untreated groundwater from wells,and(3)Restrictions on uses or activities that would disturb/interfere or have the potential to disturb/interfere with the protectiveness of the remedy and remedial components.All of OU1 is zoned Industrial Mining by Lake County,which serves to limit future changes of land use without County approval and Lake County has established a protocol to notify the EPA and the CDPHE of any proposed changes. OU3 Background and History D&RGW Slag Piles/Railroad Easement/Railroad Yard(OU3)included three slag piles(Arkansas Valley(AV), La Plata,and Harrison Street),approximately 12 acres at Harrison Avenue and Monroe Street which contained the Harrison Street slag pile,an easement that runs diagonally through the City of Leadville,and a portion of the rail yard known as Poverty Flats.The Denver&Rio Grande Western Railroad Company (D&RGW)owned theses slag piles,property,easement and rail yard when OU3 was designated in 1994•A map of OU3 can be found in the docket at www.regulations.gov(http://www.regulations.gov)under Docket ID no.EPA-HQ-SFUND-1983-0002. In i96i,D&RGW purchased the AV Slag Pile from ASARCO Incorporated for use as railroad ballast.D&RGW purchased the La Plata Slag Pile from the Leadville Sanitation District in 1970.Additionally,D&RGW purchased the Harrison Street Slag Pile and Harrison Avenue property from NL Industries in 1983. The AV Slag Pile covers approximately 4o acres just west of Stringtown.The pile generally consists of slag produced by the AV smelter that operated from 1882 to i96o.Based on aerial photography,the pile volume in the late 1950s was approximately 1.2 million cubic yards,whereas in 1998 approximately 422,000 cubic yards of slag remained,of which,approximately 19o,000 cubic yards is stockpiled fine slag. The La Plata Slag Pile,located west of the City limits of Leadville on Elm Street,has a volume estimated at 105,000 cubic yards.Bimetallic Smelting Company leased the La Plata Smelter Works in OU3 from 1892 to igoo for pyritic smelting of low-grade ores. The Harrison Reduction Works was located near the northeast corner of Harrison Avenue and Elm Street,in a residential area.The Harrison Street Slag Pile ranged from 20 to 50 feet in❑height and covered an area of ❑Start Printed approximately 3 acres.The Harrison Street Slag Pile was removed to original grade and relocated to the AV Page 6773 Slag Pile in March 1998. https://www.federairegister.gov/documents/2016/02/09/2016-02601/national-oil-and-hazardous-substance-poll ution-contingency-plan-partial-deletio... 10/16