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2023-03-29_GENERAL DOCUMENTS - M2020035
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2023-03-29_GENERAL DOCUMENTS - M2020035
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Last modified
3/30/2023 8:40:08 PM
Creation date
3/30/2023 7:20:58 AM
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Template:
DRMS Permit Index
Permit No
M2020035
IBM Index Class Name
General Documents
Doc Date
3/29/2023
Doc Name
Aquatic Resources Delineation Report - Wetland Survey
From
Elam Construction
To
DRMS
Email Name
ACY
THM
Media Type
D
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No
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burningbush, burdock, curly dock. The burningbush,burdock, and curly dock flourished in the <br /> saline wetland prior to the development of the salt flat. At the time of the delineation,the <br /> dominant plant species,burningbush, appeared to be from last year and due to soil salinization, <br /> future plant growth may be sparse and replaced by halophytes and other salt tolerant plants. A <br /> list of plant species observed within the survey area is provided in Appendix D. Wetland <br /> indicator status of each species was determined by National Wetland Plant List(ACOE 2018). <br /> 4.1.3. Hydrology <br /> The survey area is located in the upper Colorado River watershed, Hydrologic Unit Code (HUC) <br /> 14010005 with a drainage basin area of 3,090 mil. Hydrology for the project area is from <br /> ground and surface water in hydraulic connection with the Colorado River. Surface water inputs <br /> to the north lake were noted during the 2 days of site investigation in the southeast area from a <br /> 23'/4 Road culvert. The water source, in accordance with Elam Construction personnel, is mine <br /> discharge from an adjacent east gravel pit supporting open water areas. <br /> Surface water created by excavating gravel resources below the water table is the main source of <br /> hydrology for the three identified wetland areas. The main lake and west channel in the northern <br /> portion of the survey area exhibits pond permanency providing a permanently flooded water <br /> regime for fringe aquatic vegetation and soil saturation for hydric soil development. The saline <br /> wetland in the south site area shows intermittent flooding/ponding since 1986 when mining <br /> disturbance was initially noted on available Mesa County aerial imagery. <br /> The peak amount of surface water acreage for the south saline wetland occurred in 2016 with <br /> approximately 0.15-acre pond in the north portion of existing saline wetland and 0.08-acre in the <br /> southern area. Aerial photos taken in 2017 and 2019 show the saline wetland completely dry. <br /> Photography for 2020 shows small ponds existed in the spring before the onset of the growing <br /> season with the north area pond approximately 0.02 acres and south pond 0.06 acres. These <br /> areas were dry during the October 2020 site reconnaissance but depth to groundwater was near <br /> the surface for the north and greater than 2 feet in the south. Wetland data collected October 28, <br /> 2021 documented standing water in the saline wetland inundating the dry areas noted in 2020. <br /> Further analysis of area using Chapter 5 of the Arid Regional Supplement results in this area <br /> delineated as a saline wetland. This includes vegetated and unvegetated areas characterized by <br /> hydric clay textured soils supporting salt-tolerant halophytes and highly saline/alkaline soils <br /> completely devoid of vegetation. <br /> Local groundwater flow is presumed to be towards the Colorado River. The 100-year floodplain <br /> on right bank of this Colorado River reach ranges from approximately 325 to 700 feet wide in <br /> the survey area. Base Flood Elevations, for the high risk Zone AE 100-year floodplain, range in <br /> elevation along the site from 4,539 to 4,535 feet for FIRM panel 08077CO803G(Figure 5). <br /> 4.1.4. Soils <br /> Site soils logged for the paired up and wet data points were evaluated macroscopically using <br /> tactile methods to describe field textures and redoximorphic features. Soil textures for the <br /> alluvium included: sand; sand with clay; clayey sand; sandy clay; and clay. Soil epipedons <br /> 23'/4 Road Gravel Pit Page 4 of 8 December 2021 <br /> Aquatic Resource Delineation Report WestWater Engineering <br />
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