HomeMy WebLinkAbout20130685.tiffJune 29, 2011
RECEIVED
JUL 0 6 2011
Weld County Planning Department
GREELEY OFFICE
Colorado Division of Reclamation, Mining, & Safety
Attention: Michael Cunningham
1313 Sherman Street, Room 215
Denver, CO 80203
PUBLIC WORKS DEPARTMENT
1111 H STREET, P.O. BOX 758
GREELEY, COLORADO 80632
WEBSITE: WWW.CO.WELD.CO.US
PHONE: (970) 356-4000, EXT. 3750
FAX: (970) 304-6497
Re: Carma Bayshore LLC, St. Vrain Lakes, Filing 1, Slurry Wall Permit No. M-1982-
015
Dear Mr. Cunningham,
Weld County Public Works has recently become aware of a pending reclamation
release request from Carma Bayshore LLC (Carma), for its slurry wall activities at the
Siegrist gravel pits located in or about section 25, T3N, R68W. The mining activity has
impacted the way in which the FEMA mapped floodplain functions.
FEMA requires that changes such as 100 -year flood water surface elevations, floodplain
boundaries, and floodway boundaries be documented and accepted through their Letter
of Map Revision process (LOMR). The Federal Regulations that apply include but are
not limited to the following and can be found in: 44CFR 60.3(b)(3), 60.3(b)(7), and 65.3.
The mining and slurry wall activity has potentially impacted the hydrologic balance and
function of the St. Vrain River. DRMS Rule 34-32.5-116(4)(h) requires that changes to
the hydrologic balance of the affected land be minimized. Since the function of the
floodplain is a piece of the hydrologic balance, we request that Carma show what
impact their mining activity has had on the 100 -year flood water surface elevations and
floodplain functions. To date, Carma has not finalized the LOMR process that they
started with the planning of the St. Vrain Lakes Subdivision. Additionally, they have not
provided evidence to Weld County or the DRMS showing how their mining and
reclamation activities have impacted the 100 -year flood water surface elevations.
DRMS Rule 34-32.5-116(4)0) requires that areas outside of the affected land shall be
protected from damage occurring during the mining operation and reclamation. As
stated above, Carma's mining and reclamation activities may have changed the
conveyance of the floodplain in the 100 -year flood. Since the currently mapped
floodplain extends beyond Carma's property, the potential exists for surrounding
property owners to be impacted or even damaged by the mining and reclamation
activities that have occurred on Carma's property. To date, Carma has not provided
any evidence to Weld County or the DRMS showing how their mining and reclamation
activities have not impacted property owners within the mapped 100 -year floodplain.
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In order be compliant with FEMA's floodplain requirements to document changes to
mapped floodplains, Weld County respectfully requests DRMS not to release any
portion of the mine site until such time as FEMA has approved a LOMR which
documents the impacts that the mine has had on the 100 -year floodplain and the
citizens of Weld County.
Sincerely,
Clay Kimmi, P.E., CFM
Drainage and Floodplain Engineer
Weld County Public Works
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