REV100788

• Permit No: M1977193
• IBM Index Class Name: Revision
• Doc Date: 4/1/1996
• Doc Name: AMENDMENT TO MINING PN M-77-193 SWMP REQUIREMENTS
• Type & Sequence: AM2
• Media Type: D
• Archive: No

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March 27, 1996 APR 01 199fi
RE: AMENDMENT TO MINING PERMIT NO. M-77-193, SWMP RE~I'~~~
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In November, 1995, the Colorado Mined Land Reclamation Board approved an appli~;ation for
permit acreage increase by Tezak Heavy Equipment Co, Inc., Penrose, Colorado, for the
Aggregate Source Tunnel Drive Quarry with two conditions. 1) An acceptable Blasting
Monitoring Program be initiated, and 2) Stormwaters flowing through the mining are; including
those stormwaters from above the mining zone that outfall along Tunnel Drive area be conveyed
to the Arkansas River in accordance with landowners and right-of-~vay owners approval.
A Blasting Monitoring Prol,Ram has been initiated at the site after review and approval by
Division of Minerals and Geology. After discussion and negotiation with the Canori City
Hydraulic Ditch Company directors and engineering personnel from Southern Pacific:, the only
option left available for Tezak Heavy Equipment Co, Inc., was to bore a storm outfall culvert of
large proportion (app. 50 sq ft opening) under both the hydraulic ditch and the main line ofthe
Southem Pacific Railroad and direct storm outflows directly into the Arkanasas River. This
storm outfall option was deemed undesireable for a number of reasons including:
1) Negative environmental impact of directing storm water outfalls into the Arkansas River
such as increased sediment loading and increased potential for other pollutants to entr;r the River
system during a major storm event.
2) High cost (atleast $150K) and long time frame necessary to acquire right-of--way af;reements
for all parties involved.
3) The end result will not protect property and right-of--way owners from storm related impact
potentials that existjust upstream from the mine's historical stormwater outfall path.
Tezak Heavy Equipment Co, Inc., proposes to divert stormflows from the mining area and from
the large watershed directly west of the mining area to the north of the existing affected land
onto Tezak Heavy Equipment Co. property. This amendment request includes a 35 acre increase
for reserve expansion as in the November request and an additional 30 acres of groun~I to the
north of the currently permitted area for purposes of stormwater diversion and contair~ment.
Total acres of affected land will increase to 95 acres. The diversion of stormwater will take
place within the confines of the mining area as stormwater enters the mining zone fro n the west.
Approximately 90°'0 of stormwater volumes anticipated will be diverted to the north, ;sway from
Tunnel Drive residents, the hydraulic ditch, and the railroad. The remaining ten per cent of
storm flows anticipated will be contained in sediment ponds #2, #3, and #4, as shown on the
attached map of mine area. Sediment pond #4, located at the bottom of the current main haul
road at the former location of weigh scales just north of Tunnel Drive. The sediment pond will
be constructed to contain a minimum of one acre foot of storm water and will include a
contingency design for handling storm flows in excess of the 100 year event, which may overfill
the retension pond. An approved spillway device will be included that will allow for low
velocity release of stormwater from sediment pond #4 to the Tunnel Drive area should this
situation ever occur. The goal of this Stormwater Management Plan is to result in a z~:ro