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GeoEngineers 5/22/2023
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GeoEngineers 5/22/2023
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Last modified
6/2/2023 1:43:40 PM
Creation date
6/2/2023 1:43:03 PM
Metadata
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Template:
Contracts
Contractor's Name
GeoEngineers
Approval Date
5/22/2023
Council Approval Date
5/10/2023
End Date
12/31/2025
Department
Public Works
Department Project Manager
Heather Griffin
Subject / Project Title
Permitting and Monitoring Technical Support
Public Works WO Number
UT3338-2
Tracking Number
0003696
Total Compensation
$93,000.00
Contract Type
Agreement
Contract Subtype
Professional Services (PSA)
Retention Period
6 Years Then Destroy
Imported from EPIC
No
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Smith Island AMS Year 5 Monitoring | October 31, 2022 Page 2 <br />File No.0661-128-02 <br /> <br /> <br />A second aerial photograph of the entire AMS will be taken by drone during a high tide at or above 6 feet <br />NAVD88 to capture extents of tidal inundation at approximate elevation of estuarine wetlands. This <br />elevation is the approximate upward limit of where estuarine wetlands were previously documented by the <br />County and City. The aerial high tide photograph, along with point data collected during the low tide drone <br />flight, will be georeferenced and used to inform the area of wetlands based on digital processing of the <br />visual signatures of water surface and elevation. <br /> <br />Task 3 – Wetland Delineation and Habitat Mapping <br />To delineate and map areas of wetland habitat in the AMS we will use a combination of aerial imagery and <br />Light Detection and Ranging (LiDAR) elevations captured with a drone, and field verified GPS location data <br />and photopoints. <br /> <br />The low tide aerial image map will be ground-truthed using the vegetation sample plot data (Task 4), and <br />permanent photopoints. Once the map has been verified, the total area of each habitat type will be <br />calculated to identify an estimated area of each habitat across the entire AMS. <br /> <br />The area of estuarine wetland habitat within the site will be identified based on the elevation of Mean <br />Higher High Water (MHHW) as the U.S Army Corps of Engineers (USACE) limit of jurisdiction for tidal areas. <br />The occurrence of hydrology will be verified by reviewing the georeferenced high tide aerial imagery and <br />corresponding tidal chart. The occurrence of hydric soils will be field verified based on routine-level wetland <br />delineation methods using the 1987 Corps of Engineers Wetland Delineation Manual (Environmental <br />Laboratory 19871) as updated by the Regional Supplement to the Corps of Engineers Wetland Delineation <br />Manual: Western Mountains, Valleys, and Coast Region (USACE 20102), and the Department of Ecology’s <br />Washington State Wetlands Identification and Delineation Manual (Ecology 19973). The presence of <br />estuarine hydrophytic vegetation will be identified by reviewing GPS location referenced vegetation sample <br />plot data and associated vegetation photopoints. <br /> <br />Task 4 – Vegetation Monitoring <br />To document species cover and richness (i.e., number of different species) across the approximately <br />8,550 linear feet of the AMS, vegetation cover and species richness will be sampled at 220, 1- meters <br />squared (m2) quadrate locations along 22 transects that bisect the AMS. A baseline transect will be placed <br />parallel along the center of the AMS and the location of the first bisecting transect will be randomly selected <br />from within the dike breach area. Each subsequent transect will be spaced across the AMS to complete 22 <br />total transects. Each transect will have 10 sample plots spaced equally across the transect so sampling <br /> <br /> <br /> <br /> <br /> <br /> <br />1 Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1, U.S. Army Engineer Waterways <br />Experiment Station, Vicksburg, Mississippi. <br />2 United States Army Corps of Engineers (USACE), 2010, Regional Supplement to the Corps of Engineers Wetland Delineation Manual: <br />Western Mountains, Valleys, and Coast Region, ed. J.S. Wakeley, R. W. Lichvar, and C.V. Noble. ERDC/EL TR-10-3. Vicksburg, MS: <br />U.S. Army Engineer Research and Development Center. <br />3 Washington State Department of Ecology (Ecology). 1997. Washington State Wetlands Identification and Delineation Manual. Ecology <br />Publication #96-94. March 1997.
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