Wetland Services

On-Site Soils can handle all your wetland needs from site delineation to mitigation planning. A wetland delineation is performed to identify and locate all jurisdictional areas. These areas include, but are not limited to, farm ponds, streams, drainageways, and wetlands. If the proposed development is to impact any of these areas, a permit must be obtained, the Corps of Engineers may require a change in development or deny the project completely. On-Site Soils can assist you through the permit process.

Wetland services we provide:

  • Preliminary Site Assessments of Properties for Possible Ecosystem Bank Development
  • Development of Mitigation Banking Instruments – Stream, Wetland and Endangered Species
  • Coordination of State and Federal Agencies
  • Phase I Environmental Site Assessments
  • Wetland Delineations
  • Project Design
  • Permitting
  • Plantings
  • Maintenance Management
  • Monitoring
  • Construction and Oversight
  • Marketing of ecosystem credits


Here are some examples of common jurisdictional waterbodies:


Mitigation Planning

On-Site Soils can assist you through the mitigation process from stream and wetland restoration plans to mitigation bank planning and development. On-Site Soils developed the banking instrument and obtained approval for Little Dardenne Creek Mitigation Bank. This bank is the third of its kind in the U.S. Mitigation banks are becoming a popular trend for developers that require compensation for impacts to jurisdictional waterbodies on their projects. Once again, On-Site Soils can assist you with the most minor mitigation to large scale mitigation planning.


What is a Mitigation Bank?

A mitigation bank is a wetland, stream, or other aquatic resource area that has been restored, established, enhanced, or (in certain circumstances) preserved for the purpose of providing compensation for unavoidable impacts to aquatic resources permitted under Section 404 or a similar state or local wetland regulation. A mitigation bank may be created when a government agency, corporation, nonprofit organization, or other entity undertakes these activities under a formal agreement with a regulatory agency.

Mitigation banks have four distinct components:

  • The bank site: the physical acreage restored, established, enhanced, or preserved;
  • The bank instrument: the formal agreement between the bank owners and regulators establishing liability, performance standards, management and monitoring requirements, and the terms of bank credit approval;
  • The Interagency Review Team (IRT): the interagency team that provides regulatory review, approval, and oversight of the bank; and
  • The service area: the geographic area in which permitted impacts can be compensated for at a given bank.

The value of a bank is defined in “compensatory mitigation credits.” A bank’s instrument identifies the number of credits available for sale and requires the use of ecological assessment techniques to certify that those credits provide the required ecological functions. Although most mitigation banks are designed to compensate only for impacts to various wetland types, some banks have been developed to compensate specifically for impacts to streams (i.e., stream mitigation banks).
Mitigation banks are a form of “third-party” compensatory mitigation, in which the responsibility for compensatory mitigation implementation and success is assumed by a party other than the permittee. This transfer of liability has been a very attractive feature for Section 404 permit-holders, who would otherwise be responsible for the design, construction, monitoring, ecological success, and long-term protection of the site.


What is a Riparian Area?

Riparian areas or zones have been defined in several ways, but they are essentially the narrow strips of land that border creeks, rivers or other bodies of water. Because of their proximity to water, plant species and topography of riparian zones differ considerably from those of adjacent uplands. Although riparian areas may occupy only a small percentage of the area of a watershed, they represent an extremely important component of the overall landscape.

A healthy, functioning riparian area and associated uplands dramatically increase benefits such as fish and wildlife habitat, erosion control, forage, late season stream-flow, and water quality.

Riparian ecosystems are extremely productive and have diverse habitat values for wildlife. The linear nature of riparian ecosystems provides distinct corridors that are important as migration and dispersal routes and as forested connectors between habitats for wildlife. Riparian ecosystems also provide shelter, nesting areas, for gaging breeding areas for many types of threatened or endangered species.

The Importance of Healthy Riparian Zones:

Riparian zones may be natural or engineered for soil stabilization or restoration. These zones are important natural biofilters, protecting aquatic environments from excessive sedimentation, polluted surface runoff and erosion. They supply shelter and food for many aquatic animals and shade that is an important part of stream temperature regulation. When riparian zones are damaged by construction, agriculture or silviculture, biological restoration can take place, usually by human intervention in erosion control and revegetation. If the area adjacent to a watercourse has standing water or saturated soil for as long as a season, it is normally termed a wetland because of its hydric soil characteristics. Because of their prominent role in supporting a diversity of species, riparian zones are often the subject of national protection in a Biodiversity Action Plan.

Research shows riparian zones are instrumental in water quality improvement for both surface runoff and water flowing into streams through subsurface or groundwater flow. Particularly the attenuation of nitrate or denitrification of the nitrates from fertilizer in this buffer zone is important. Riparian zones can play a role in lowering nitrate contamination in surface runoff from agricultural fields, which runoff would otherwise damage ecosystems and human health. The use of wetland riparian zones shows a particularly high rate of removal of nitrate entering a stream and thus has a place in agricultural management.

Roles and functions:

Riparian zones dissipate stream energy. The meandering curves of a river, combined with vegetation and root systems, dissipate stream energy, which results in less soil erosion and a reduction in flood damage. Sediment is trapped, reducing suspended solids to create less turbid water, replenish soils, and build stream banks. Pollutants are filtered from surface runoff which enhances water quality via biofiltration.


What is a Wetland?

Wetlands are defined as “those areas that are inundated or saturated by surface or groundwater 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. Wetlands generally include swamps, marshes, bogs and similar areas.”

Since wetlands lie at the interface of terrestrial and aquatic habitats, they possess a unique mixture of species, conditions, and interactions. As a result, wetlands are among our planet’s most diverse and varied habitats.

Wetlands are habitat for thousands of migrating ducks and geese as well as other fish, mammals, birds, reptiles and amphibians. Wetlands also filter water by slowing down water and removing many of the pollutants before they get to our larger streams and rivers.

Since 1980 more than half of the 221 million acres of pre-settlement wetlands have been destroyed.

On-Site Soils

4077 N Saint Peters Pkwy
St. Peters, MO 63304-7396
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Our office is located along the north outer road of the new Hwy 94. click here for directions

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On-Site Soils performs soil evaluations for the entire state of Missouri. Please call or fill out this form for prices.
Subdivisions served by on-site sewage disposal are becoming more popular in the rural Missouri areas. Click here for subdivision fee schedule.

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