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2020-12-28_GENERAL DOCUMENTS - M1977300 (22)
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2020-12-28_GENERAL DOCUMENTS - M1977300 (22)
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Last modified
1/9/2025 6:28:15 AM
Creation date
12/29/2020 5:26:52 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977300
IBM Index Class Name
General Documents
Doc Date
12/28/2020
Doc Name Note
Part 1 of 3
Doc Name
North Waste Rock Pile Diversion
From
Colorado Legacy Land
To
DRMS
Email Name
AME
Media Type
D
Archive
No
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PERMIT#: M-1977-300 <br /> INSPECTOR'S INITIALS: AME <br /> INSPECTION DATE:November 19,2020 <br /> OBSERVATIONS <br /> This inspection of the Schwartzwalder Mine (Permit No. M-1977-300) was conducted by Amy Eschberger and <br /> Tim Cazier of the Division of Reclamation, Mining and Safety(Division). The operator was represented by <br /> Elizabeth Busby, Billy Ray, and Sam Lowe during the inspection. The site is located approximately 6 miles <br /> northwest from Golden, CO in Jefferson County. Access to the site is off Glencoe Valley Road. This site is on a <br /> quarterly inspection frequency. The 4th quarter inspection was conducted on October 8, 2020. Photos 1-20 <br /> taken during the inspection are included with this report. <br /> The primary purpose of this inspection was to observe the completed diversion channel project for the North <br /> Waste Rock Pile (NWRP) approved under Technical Revision No. 28 (TR-28; approved on March 27, 2020). <br /> Because the NWRP is considered an Environmental Protection Facility(EPF), per Rule 7.2.1(1), construction <br /> work shall be done in phases, and no construction work shall begin on any subsequent phases of the facility <br /> without first obtaining Division acceptance. The construction schedule provided in TR-28 proposed three <br /> primary phases for the project, after which, the Division would conduct an inspection of the work completed. <br /> The Division conducted the Phase 1 inspection on August 4, 2020 to observe the water capture structure (seal <br /> wall)trench constructed into bedrock in the ephemeral drainage above the NWRP, at the upstream end of the <br /> diversion channel. The Division accepted the Phase 1 work completed in its inspection report signed on August <br /> 6, 2020. <br /> The Division conducted the Phase 2 inspection on October 8, 2020 to observe the completed channel subgrade <br /> and the installation of the Geoweb components. The Geoweb components include a three-liner base system <br /> -omposed of a geosynthetic liner sandwiched between two non-woven geotextile liners, and the four inch thick <br /> eoweb panels installed across the top of the liner system. During the Phase 2 inspection, the Division also <br /> observed the completed water intake structure installed at the upstream end of the diversion channel, which <br /> includes a concrete seal wall, a perforated pipeline buried upstream of the seal wall which transitions to a solid <br /> pipeline prior to daylighting approximately 50 feet downstream of the seal wall to discharge into the channel, <br /> two cleanout pipes, and a riprap layer placed over the water intake structure. The Geoweb components from the <br /> diversion channel were mechanically attached to the upstream face of the seal wall prior to concrete placement <br /> inside the channel. The Division accepted the Phase 2 work completed in its inspection report signed on <br /> October 13, 2020. <br /> While not required per the approved construction schedule, the Division also conducted an inspection on <br /> October 16, 2020 to observe the concrete infill placement into the Geoweb panels installed across the diversion <br /> channel. During the inspection, the operator completed filling a little more than half of the total channel length <br /> (approximately 600 feet) with concrete. The operator appeared to be following the manufacturer's <br /> recommendations, including leaving no Geoweb cells partially filled in between concrete pours. At that time, <br /> remaining construction work for the project included completing the concrete placement in the channel, <br /> completing backfilling and grading the ground surface along the outside edges of the channel to create positive <br /> drainage, constructing the energy dissipation basin and road crossing at the downstream end of the channel, and <br /> seeding areas disturbed by the project(besides the NWRP access road). <br /> During the current inspection, the operator stated the NWRP diversion channel project had been completed the <br /> day before. The Division observed all components of the completed diversion channel project, including the <br /> water intake structure, the concrete-lined diversion channel, the outlet pipe into the channel,the grading <br /> )mpleted in areas adjacent to the channel, the grading of other disturbed areas (e.g., top of NWRP, disturbed <br /> slope south of access road and channel, side slope of access road), the riprap-lined energy dissipation basin and <br /> road crossing, and the seeded areas. The water intake structure looked the same as it did during the Division's <br /> last inspection, except the operator had added some additional riprap to bolster the shoulders of the trench. The <br /> Page 2 of 15 <br />
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