C.C. Dorion Geological Services, LLC 79 Bennoch Rd.  Orono, ME 04473
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Maine Certified Geologist #485
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New Hampshire Professional Geologist #795
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Maine Certified Soil Scientist #454
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New Hampshire Certified Wetland Scientist #251
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Maine Certification in Erosion and Sedimentation Control Practices - MDEP
Welcome

The deliverable product of a WETLAND DELINEATION PLAN in PDF format (size is 800 KB) meets or exceeds the criteria necessary for regulatory approval.

  • Wetland boundaries are located with differentialing GPS equipment, which is subsequently processed by a Professional Land Surveyor.

  • Wetlands of Special Significance, as defined by MDEP under Maine's NRPA, and other Protected Natural Resources such as vernal pools and streams, are identified during the WETLAND DELINEATION.

  • For US Army Corps of Engineers regulations under Section 404 of the Clean Water Act, jurisdictional determinations are completed in the field.

A soil pit showing a well drained, upland spodosol soil.
A palustrine, scrub-shrub wetland dominated by Alnus incana, Cornus amomum, Betula populifolia, Acer rubrum, Carex crinita, Calamagrostis canadesis, and Iris versicolor.
I am pleased to be able to provide wetland delineation services to clients in northern and eastern Maine. Wetland - upland boundaries can be accurately located, mapped, and appropriate wetland - upland data compiled in order to comply with Federal, State, and Town regulations. This work can assist in project planning, real estate evaluation, storm water management, and other development or conservation projects.

Wetland delineations arose from passage of the Clean Water Act §404, which prohibits the discharge of dredged or fill material into waters of the United States - rivers, lakes, streams, and wetlands - unless a permit from the U.S. Army Corps of Engineers (ACOE) has been authorized or the activity is permitted by exemption. These regulations seek to "maintain and restore the chemical, physical, and biological integrity of the waters of the United States." (1987 ACOE Wetlands Delineation Manual). In 1995 Maine¹s Natural Resource Protection Act (NRPA) was amended to include jurisdiction over all wetlands in the State. The Maine Department of Environmental Protection (MDEP) is responsible for reviewing activities that will affect freshwater wetlands. MDEP developed a three-tiered permitting system based on the area of potential wetland impact.

A piston core from a carbonate lake in Aroostook County.The gray sediment at the base is characteristic of late-glacial age (10,000 to 12,000 years before present); the tan layered marl sediments represent lowered lake levels from 9,000 to 5,000 years B.P., and the dark brown upper sediments indicate deeper, more acidic water conditions similar to the modern environment.

Wetlands are one component of the "waters of the United States"; wetlands can take many forms in Maine: peatlands, fringing marshes adjacent to ponds, floodplain forest, wet meadows, intermittent streams, scrub-shrub swamp (alder, willow, viburnum, holly), and forested fens and bogs. All share physical characteristics that classify them as wetlands: "Those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions."(1987 ACOE).

Wetlands are determined by evaluation of three parameters: hydrology, soils, and vegetation. Aquic conditions must be present to meet hydrologic requirements, hydric soils must dominate the wetland, and hydrophytic vegetation must also be dominant in order to classify an environment as a wetland.

Investigation of Lake and Bog Sediments

Closed basins such as lakes, ponds, bogs, and associated wetlands often contain continuous records of sedimentation. Since deglaciation approximately 12,000 years ago, annual layers of sediment, plant remains, and pollen have accumulated and become preserved in the anoxic bottom waters of these basins. Using piston
A coastal peatland dominated by Ericaceae and Sphagna.
coring from a platform at the surface, continuous records of sediment can be retrieved. Cores are subsampled and analysed for macrofossil remains, organic and carbonate content, radiocarbon determinations, and stable isotopes (d13C and d18O). Analyses from these cores can provide data that document: 1) The time of formation of the basin; 2) The changing forests/ecosystems in the watershed through time; 3) A history of lake levels (paleohydrology) since deglaciation; and, 4) Implications/interpretations for this data.

For example, a recent Phase III archaeological site investigation, located on uplands adjacent to a lake shoreline, required a paleohydrologic investigation. Results from the paleohydrologic study showed significant lake level fluctuations during the last 9,000 years. The lake¹s surface area had diminished, its outlet had ceased flowing, and a modern inlet stream was functioning as the outlet. These findings suggested that archaeological settlement patterns were probably substantially different than the modern configuration of the lake basin would suggest.

Loss on ignition and macrofossil diagram for a paleohydrologic study.  The shift from aquatic to emergent to fen plant species is interpreted to represent lowering of lake level by ~2.5 meters.
Click here to view a full size version of this diagram.

 


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