Wetlands Delineation in Taos County, NM

GGI was contracted to identify and delineate wetlands on a proposed construction project site located in Taos county, NM. Wetlands delineation based on results of vegetation, hydrology and soils investigations was performed by GGI in conformance with Army Corps of Engineers Wetlands Delineation Manual.

Vegetation: Representative vegetation samples were collected from study area, identified to the species level and assigned wetlands indicator status.

Soils: A total of 36 soil pits were dug in areas where surface soil, drainage and vegetation indicated potential presence of wetlands. Soil horizons were examined for thickness and for characteristics such as percent gravel, moist soil color, texture, structure and consistence and soils classification was assigned.

Surface water hydrology: Onsite and offsite drainage patterns were investigated for wetland indicators such as surface inundation, watermarks, frit lens, sediment deposits, drainage patterns and water-stained leaves.

Groundwater Hydrology: Depth to water was recorded multiple times and soil saturation was recorded. All areas with surface inundation, evidence of past inundation or depth to water of 15 inches or less were classified as having wetlands hydrology.

Impact: The three wetlands areas delineated by GGI, in consultation with the corps personnel, would likely be impacted by the proposed development. Since the combined delineated area was greater than 0.1 ac, a section 404 permit was recommended to be obtained.

It was concluded that planned construction activities would result in the discharge of fill materials to the on-site wetlands and the loss of wetlands would mitigated by the establishment of an offsite wetland area located less than two miles from the project site. The wetland delineation report and mitigation plan were accepted by Army Corps.