Appendix C - Biological Resources Supporting Information COMBINED

(i) All wetland(s) being considered in the cumulative analy sis: Pick List (ii) Approximately ( ) acres in total are being con si dered in the cumulative analysis. (iii) For each wetland associated with the reach or waterbody being analyzed in this form, specify the following: I Number/Name 8 Directly abuts (Yes/No) Size I Number/Name Directly abuts (Yes/No) Size Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres Pick acres (iv) Summarize overall biological, chemical and physical functions being performed: C. SIGNIFICANT NEXUS DETERMINATION 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 ofa 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 One non-RWP is present on site. This feature is hydrologically connected to the onsite Devaney Creek, a RPW USGS blue line stream that is hydrologically connected to a traditional navigable water, the SF Bay, as it flows into Dublin Creek, whch drains into San Francisco Bay via South San Ramon Creek and Alameda Creek 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 111.D: 8 In the Number/Name column, add the number and/or name that you have given the wetland being referred to in the table . Example, you are referring to a wetland on your wetland delineation map number 6, that you call wetland No.3 on a reach you refer to as Putah Creek . For this wetland you would add to the table in the Number/Name column, something like the following: (No. 3, Putah Ck., Map# 6). udOB0207 '1/~'IJ 5