REP17589

• Permit No: M1993041
• IBM Index Class Name: Report
• Doc Name: APPENDIX DOWE FLATS PROJECT WETLANDS
• Media Type: D
• Archive: No

-2-
~• Engineers, 1987). These are hydrology, soils, and vegetation.
Thus, wetland areas must:
1) Periodically or permanently be inundated or have
saturated soils;
2) Have vegetation consisting of species typically adapted
for life in saturated soil conditions; and
3) Have soils showing evidence of development under
anaerobic conditions that occur during periods of
j prolonged soil saturation.
J When wetland indicators of ALL three parameters were present,
the area was considered to be wetland. When indicators of ANY of
the three parameters were absent, the area was considered to be
either non-wetland or an atypical situation.
t
B. Field Identification
Field reconnaissances necessary to complete preliminary
wetland maps were conducted during Map of 1987 at a mapping scale
of 1"=400'. Wetland determinations were made in the field based
on the Corps multiple-parameter approach in conjunction with
methods as outlined in the U.S. Army Corps of Engineers
Delineation Manual (1987). Three specific parameters were
sampled as described below:
Vegetation: The dominant species at a given observation point
were recorded within a 5 foot radius for herbs and shrubs, and at
a 30 foot radius for trees and woody vines. Wetland indicator
' status of each of the dominants was determined using the U.S.
Army Corps of Engineer plant list for Central Plains, Region 5.
Soils: At each observation point a test pit was dug with a
diameter of 12" and depth of 15". The soil matrix below the
organic zone was described using Munsell (1975) soil color
charts. The presence of any and all wetland soil indicators such
as bedding planes in sandy substrate, gleying, mottling, build up
of hydrogen sulfide, and iron and manganese concretions were
recorded.
Hydrology: Percent soil saturation in the matrix was recorded.
Hydrologic soil indicators such as drainage patterns, drift
lines, sediment deposits, and watermarks were also observed and
recorded.
Observation points were established in each wetland area. If
initial results were questionable, additional observation points
were established. All results were recorded on the original
field maps.
C. Corps of Engineer Field Verification
An on-site field meeting for the purpose of wetland boundary
verification at Dowe Flats was held on September 11th, 1987.
Those in attendance were Mr. Terry McKee (COE, Denver), Mr. Mike
Dollaghan, Mr. Mike Figgs, h1s. Laurie Rink (AWC), and Mr. Karl
Birkeland IAWC). Preliminary wetland boundaries were agreed
upon. Final wetland maps have been produced and s letter of
concurrence from the Corps of Engineers has been received.