1997-05-26_REVISION - M1981302

• Permit No: M1981302
• IBM Index Class Name: Revision
• Doc Date: 5/26/1997
• Doc Name: PROPOSED GRADING PLAN WESTERN MOBILE INC DEEPE FARM PIT PN M-81-302
• From: DMG
• To: GREGG SQUIRE
• Type & Sequence: AM2
• Media Type: D
• Archive: No

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999
STATE OF COLOMDO
DIVISION OF MINERALS AND GEOLOGY
of
Department of Natural Resources
1313 Sherman Room 215
Denver,Colorado 80203
Phone:[phone]
FAX:[phone] 7"7
DEPARTMENT OF
NATURAL
RESOURCES
DATE: May 26, 1997 Roy Romer
Governor
James S.Lochhead
TO: Gregg Squire Executioe Director
nt¢hae18 Long
FROM: Allen Sorenson �' Division Director
RE: Proposed Grading Plan, Western Mobile, Inc. , Deepe Farm
Pit, Permit No. M-81-302
The grading plan for reclamation of the Deepe Farm Pit proposed in
technical revision TR-006 includes a flood control berm along the
south and east perimeters of the pit . The proposed grading plan
also includes an interior drainage ditch that is to be located
approximately 200 feet inside the berm. The purpose of the berm is
not described in the TR-006 application, and no design details for
the berm are provided other than the configuration of the berm as
depicted on the reclamation plan topographic map.
The City of Boulder and the Boulder County Commissioners have
expressed a number of concerns related to the proposed inclusion of
the berm in the reclamation plan. The City of Boulder has
requested that the Division "require Western Mobile to submit
additional detailed information about the land berm and relevant
impacts on the surrounding community prior to any final
determinations concerning the proposed reclamation plan amendment
for the Deepe Farm Pit . " The City of Boulder' s request would
appear to be justified under sections 34-32-116 (2) , (7) (b) , and
7 (g) of the statute . This is because little detail related to the
construction of the berm has been provided by the applicant and
because the location of the berm within the 100-year floodplain
creates the potential to cause disturbance to the prevailing
hydrologic balance and to damage adjoining property. The Boulder
County Commissioners have raised concerns similar to those of the
City of Boulder.
In order to address the potential for off-site impacts related to
the proposed berm, Western Mobile must provide a floodplain
analysis that compares flood inundation that would occur if the
reclamation contours approved in 1989 were installed, to flood
inundation that would occur based on the reclaimed contours
proposed in technical revision TR-006 . The attached memorandum
provides guidelines for conducting such an analysis . Using Urban
Drainage and Flood Control District definitions as a guideline, an