2005-03-14_REVISION - M2000016

• Permit No: M2000016
• IBM Index Class Name: Revision
• Doc Date: 3/14/2005
• Doc Name: Adequacy Review Response
• From: Lafarge West Inc.
• To: DMG
• Type & Sequence: AM1
• Media Type: D
• Archive: No

~FARGE
NORTH AMERICA
AGGREGATES, CONCRETE
& ASPHALT
A copy of a separate response to these issues is enclosed; please see the attached memo.
4. Exhibit H -Wildlife Information and Exhibit C Mine Plan Maps
a) A review of the mine plan maps shows a 200 foot setback from the mining limits to
the South Platte River, but also shows disturbance boundaries which are much closer
to the river, in some areas possibly as close as 20 to 30 feet, including the location of
topsoil/overburden stockpiles. In the comment letter from the Colorado Division of
Wildlife (DOW), dated January 21, 2005, it is stated, '7n order to protect the
riparian area and the diversity of large and small mammals, birds, and herptiles that
inhabit the site, a 200' setbackfrom the western shoreline of the river is
recommended. It is also recommended to keep as many of the mature cottonwoods
as possible, and leave snags where feasible. "Please submit a plan to leave a 200
foot undisturbed riparian corridor between the disturbed area and the riverbank and
describe how this area will be protected from any accidental disturbance. Also
describe what number (or areas) of mature cottonwoods will be protected and how
they will be protected. It has been shown that groundwater dewatering can kill
cottonwoods. Will the operator take measures to prevent the killing of cottomvoods
through groundwater dewatering? If so, please describe these measures.
The maps have been revised to reflect a 200-feet undisturbed riparian corridor between
the disturbed area and the riverbank. Lafarge will use T-posts to stake the 200-feet offset
to clearly define the limits of disturbance and to ensure protection of the riparian
corridor. Lafarge will not directly disturb cottonwoods within the 200-feet corridor and
will use water from dewatering operations and perforated pipe to water the cottonwoods
while the pit is dewatered.
b) A copy of the January 21, 2005 DOW comment letter is enclosed. Please respond to
their concerns regarding:
i. Bald Eagle winter night roosts
Lafarge is coordinating efforts with DOW representatives and wildlife
consultants to identify the exact location of potential eagle roosts. Lafarge has
met with both DOW and USFWS at the site; mitigation measures are being
developed.
ii. Perch buffers and leaving a portion of Prairie Dog Colony A intact for a food
supply for raptors
Lafarge, DOW, USFWS met on site Friday, February 25, at which time the
agencies consented to the removal of prairies dogs within the permit boundary,
provided the removal occurs prior to April 1.
LAFARGE NORTH AMERICA INC. -Aggregates, Concrete & Asphalt
10170 Church Ranch Way Suite 200, Westminster, Colorado 80027
Telephone: [phone] Facsimile: [phone]