PERMFILE55329

• Permit No: M1990021
• IBM Index Class Name: Permit File
• Doc Date: 9/14/1990
• Doc Name: VIRGINIA ACRES GRAVEL PIT FN M-90-021 ADEQUACY LETTER OF SEPTEMBER 7 1990
• From: UNITED COMPANIES
• To: MLRD
• Media Type: D
• Archive: No

Michael J. Boyd
Page 2
September 13, 1990

The original of Map No. 1 does not reproduce well and clear definition of
the 100 year floodplain delineation is not possible, however, the National
Flood Insurance map correlates very well with this map. The original Map
No. 1 is from FEMA, Flood hazard Information of the Colorado River and
Tributaries, dated November 1976, Sheet 386, Ptate 42.
The Mesa County Floodplain Administrator also used Map No. 1 as part of
their sources in evaluating our Floodplain Permit application.
With regard to the studies that were made by United Companies to determine
the 100 year floodplain, we defer to the 1976 Army Corps of Engineers
study as recognized by FEMA and the Mesa County Floodplain Administration
evaluation that was done in the process of issuing the Floodplain Permit,
of which you have already received a copy (July 16, 1990).
Again, regarding the issue of the integrity of the riverbank and the
potential for flooding of this bank, we have submitted our plan to you as
a result of advice from the Mesa County Floodplain Administrator, Jacklynn
Gould, P.E. The measures that were detailed are those that are believed
by Mesa County Engineering to be the appropriate measures.
There have actually been three areas identified by Mesa County Engineering
that need reinforcement. These sections are identified in the Floodplain
Permit Submittal Site Plan Map.
The Floodplain Administrator's primary method of bank protection is that
of soil stabilization. The floodplain permit required a dense planting of
trees along the riverbank, and reserves the right to require further
vegetation soil stabilization.
If you would like further comment from Mesa County on their position
regarding the Floodplain Permit that was issued to United Companies,
specifically those regarding the location of the 100 year floodplain
delineation, please call Joe Croker, Engineering Supervisor at (303) 244-
1815 or Jacklynn Gould, P.E., Staff Engineer at [phone].
Additionally, a more recent study has been done for FEMA by J.F. Sato and
Associates of Littleton, Colorado. This latest study dated 1989-1990, is
at this point preliminary and has not officially been accepted by FEMA
until complete verification can be done.
However, assuming that the Sato study is valid, the floodplain elevations
in the subject area have been lowered by 2 to 3 feet.
United Companies of Mesa County, Inc.