PERMFILE105726

• Permit No: M1982015
• IBM Index Class Name: Permit File
• Doc Date: 3/5/1982
• From: COLO WATER CONSERVATION BOARD
• To: WELD CNTY DEPT OF PLANNING SERVICES
• Media Type: D
• Archive: No

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= ~ ~ • III IIIIIIIIIIIIIIII ~ STATE O~ COLORADO
COEO MDO WATFR CONSERVATION BOARU
Depanmenr of Natural Refourco
81] Suie Cena~niai ewldmg
UI7 Sherman Sveet
Drnver, Colorado 80107
Phon¢. 0071 BhbiHl
Mr. Greg Oxenfeld
Weld County Department
915 Tenth Street
Greeley, Colorado 80631
Dear Mr. Oxenfeld:
~~ f
Rrthard D. Eamm
Governor
' 1. William A1C Donald
DlrMpf
March 5, 1982 David W. \Vall er
Deputy D~r¢¢tor
of Planning Services
The Colorado Water Conservation Board staff has completed
a flood hazard review for the Siegrist Gravel Mining Operation
in part of Section 2, T2N, R68~•7 and parts of Sections 35 and 36,
T3N, R68w of Weld County, Colorado (Case Number USR-989:82:4).
We offer the following findings and recommendations for your
consideration.
Findings:
1) The majority of the mining site is located within the
100-year floodplain of St. Vrain Creek as defined by
the U. S, Army Corps of Engineers in their July 16, 1981,
technical write-up on St. Vrain and Boulder Creeks. Also,
local drainage may cause some minor flooding problems.
2) The 100-year flood outline shown on the Mining Plan
(Exhibit D) is approximately correct. A better outline
would result if the Corps elevations were used for the
delineation.
3) The contractor has agreed to keep fuel storage and
primary production facilities outside or above the 100-
year flood elevations, to reclaim the area, shape and
seed all dikes, allow for at least 3 feet of freeboard
on the dikes, not to mine in the river, protect the
stream bank and vegetate as necessary and to grade and
replace the topsoil upon completion.
9) The reclamation plan appears to be raising the existing
ground surfaces 2 to 3 feet when compared to the April 25,
1977, topographic maps of the area.
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