2010-09-13_HYDROLOGY - M1981185

• Permit No: M1981185
• IBM Index Class Name: Hydrology
• Doc Date: 9/13/2010
• Doc Name: WQCD Report May Day Mine
• From: CDPHE
• To: Wildcat Mining Corporation
• Email Name: WHE
• Media Type: D
• Archive: No

Wildcat Mining Corporation: Idaho Mine and mill site
November 10, 2008
Inspection Report
Records Review Finding
1. Construction and land-disturbing activities began at the site on June 15, 2008, as provided by Mr.
Mike Clements, Owner. The facility does not currently have a (Construction Stormwater)
Permit.
Facility Inspection Finding
2. November 3, 2008:
At the time of inspection, road construction was observed from County Road 124 east to canyon
edge where the road cut switchbacks down a very steep (>45°) slope along the La Plata River
and abutting wetlands (see photos 2a.-e.). Cut and fill operations for road cut were observed
directly above and across wetlands. Soil was notably loose and unstable especially where cut
and fill operations were occurring above the wetland area. Intermittent sections of silt fence
were observed overtopped by rocks and fill material and deemed inadequate for slope above
wetland area (see photos 2e.-f.). Given the slope considerations and the amount of material
trying to be stabilized, significant potential exists for sediment to discharge into wetlands.
Cut and fill activities associated to road construction continued down to the canyon floor across a
small portion of wetlands and a natural drainage requiring culvert installation. At the time of
inspection, the culvert was observed without Best Management Practices (BMPs) for inlet
protection (see photo 2g.). In order to advance the road through drainage area, according to Mr.
Tom Baca, Superintendent on site, a '`small area of wetlands about l Oft2,, was displaced with fill
material.
Some sections of silt fencing were improperly installed with material attached to the outside of
the stakes (see photo 2h.). In the event of heavy precipitation and subsequent now volume, silt
fencing for this application is an inadequate BMP. The potential exists for sediment to discharge
into wetland near culvert outlet at toe of slope.
Road construction parallel to the La Plata River was observed continuing north up the canyon to
a point where it intersects Forest Service road and meets a bridge (over the river). Just south of
the bridge, the road continues through the river where obvious crossings had been made (see
photo 2i.). Vehicle/equipment crossings were corroborated by Mr. Baca at the time of
inspection.
On the east side of the river, the road continues northeast up to the Idaho mine and mill site.
Other than a switchback that had been recently widened no other soil disturbances were observed
on this side of river. A diesel fuel drum was observed at the Idaho mill location without BMPs
for secondary containment (see photo 2j.). It was noted at the time of inspection that east of the
river, the road was pre-existing for access to two other mines (Mayday and Incas).
November 4, 2008:
The total area of disturbance was calculated at 53,965 W using a Leica DISTO A5 laser range
finder and measuring wheel.
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