2014-09-23_REVISION - M1978078

• Permit No: M1978078
• IBM Index Class Name: Revision
• Doc Date: 9/23/2014
• Doc Name: Response
• From: COE
• To: DRMS
• Type & Sequence: CN1
• Email Name: AME
• Media Type: D
• Archive: No

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A significant nexus analysis will assess the flow characteristics and functions of the tributary itself and the functions performed
by any wetlands adjacent to the tributary to determine if they significantly affect the chemical,physical,and biological integrity
of a TNW. For each of the following situations,a significant nexus exists if the tributary,in combination with all of its adjacent
wetlands,has more than a speculative or insubstantial effect on the chemical,physical and/or biological integrity of a TNW.
Considerations when evaluating significant nexus include,but are not limited to the volume,duration,and frequency of the flow
of water in the tributary and its proximity to a TNW,and the functions performed by the tributary and all its adjacent
wetlands. It is not appropriate to determine significant nexus based solely on any specific threshold of distance(e.g.between a
tributary and its adjacent wetland or between a tributary and the TNW).Similarly,the fact an adjacent wetland lies within or
outside of a floodplain is not solely determinative of significant nexus.
Draw connections between the features documented and the effects on the TNW,as identified in the Rapanos Guidance and
discussed in the Instructional Guidebook.Factors to consider include,for example:
• Does the tributary,in combination with its adjacent wetlands(if any),have the capacity to carry pollutants or flood waters to
TNWs,or to reduce the amount of pollutants or flood waters reaching a TNW?
• Does the tributary,in combination with its adjacent wetlands(if any),provide habitat and lifecycle support functions for fish and
other species,such as feeding,nesting,spawning,or rearing young for species that are present in the TNW?
• Does the tributary,in combination with its adjacent wetlands(if any),have the capacity to transfer nutrients and organic carbon that
support downstream foodwebs?
• Does the tributary,in combination with its adjacent wetlands(if any),have other relationships to the physical,chemical,or
biological integrity of the TNW?
Note:the above list of considerations is not inclusive and other functions observed or known to occur should be documented
below:
1. Significant nexus findings for non-RPW that has no adjacent wetlands and flows directly or indirectly into TNWs. Explain
findings of presence or absence of significant nexus below,based on the tributary itself,then go to Section III.D:
2. Significant nexus findings for non-RPW and its adjacent wetlands,where the non-RPW flows directly or indirectly into
TNWs. Explain findings of presence or absence of significant nexus below,based on the tributary in combination with all of its
adjacent wetlands,then go to Section III.D:
3. Significant nexus findings for wetlands adjacent to an RPW but that do not directly abut the RPW.Explain findings of
presence or absence of significant nexus below,based on the tributary in combination with all of its adjacent wetlands,then go to
Section III.D:
D. DETERMINATIONS OF JURISDICTIONAL FINDINGS.THE SUBJECT WATERS/WETLANDS ARE(CHECK ALL
THAT APPLY):
1. TNWs and Adjacent Wetlands. Check all that apply and provide size estimates in review area:
❑TNWs: linear feet, wide,Or acres.
❑Wetlands adjacent to TNWs: acres.
2. RPWs that flow directly or indirectly into TNWs.
❑Tributaries of TNWs where tributaries typically flow year-round are jurisdictional.Provide data and rationale indicating that
tributary is perennial:
❑Tributaries of TNW where tributaries have continuous flow"seasonally"(e.g.,typically three months each year)are
jurisdictional. Data supporting this conclusion is provided at Section III.B. Provide rationale indicating that tributary flows
seasonally:
Provide estimates for jurisdictional waters in the review area(check all that apply):
❑Tributary waters: linear feet wide.
❑Other non-wetland waters: acres.
Identify type(s)of waters:
3. Non-RPWss that flow directly or indirectly into TNWs.
❑Waterbody that is not a TNW or an RPW,but flows directly or indirectly into a TNW,and it has a significant nexus with a
TNW is jurisdictional.Data supporting this conclusion is provided at Section III.C.
Provide estimates for jurisdictional waters within the review area(check all that apply):
❑Tributary waters: linear feet, wide.
❑Other non-wetland waters: acres.
Identify type(s)of waters:
4. Wetlands directly abutting an RPW that flow directly or indirectly into TNWs.
'See Footnote#3.