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Hello Carol,
Happy New Year and I hope you had a good holiday season!
As we previously discussed last month, the City of Diamond Bar has been considering conducting additional improvements to the Canyon Loop Trail in response to trail performance with
rainfall this season. These additional improvements are primarily focused on containing erosion and controlling run-off to the extent possible in areas that have been observed thus
far to be more susceptible to rainfall damage even with existing work, and would still occur within the existing approved footprint of the project. I have been notified by the City
that they have approved the additional cost for the construction contractor to implement these additional improvements, which would occur after the current construction finishes.
Based on the conversation that you and I had, the City has agreed to implement the following avoidance and minimization measures for this additional work:
* If construction is to occur past February 14, a full-time biological monitor will be required for all work occurring within 500 feet of a known California Gnatcatcher territory, based
on the territories mapped during my 2020 protocol surveys and/or any updated territory locations/extents incidentally observed during current biological monitoring. To minimize impacts
to gnatcatchers as the nesting season begins, work within 500 feet of known territories will be prioritized over work outside of 500 feet. Work outside of 500 feet from a known territory
will not require a full-time monitor and will proceed with the current weekly check-in schedule for biomonitoring.
* Because the project does not possess an incidental take permit, if the biological monitor detects gnatcatcher breeding activity/nesting within 500 feet of construction, all work within
a 500-foot buffer of the gnatcatcher’s territory will be required to cease for the duration of the nesting season, or until authorization is otherwise granted by the USFWS to proceed
again at an earlier date. The USFWS will be notified of any gnatcatcher breeding activity within 24 hours of detection. Work outside of a 500-foot buffer from established gnatcatcher
territories/nesting may continue to proceed but consistent with MMRP Measure BIO-3 if more than 7 days have elapsed since the last time work occurred in that area, a nesting bird survey
with negative results will be required prior to work re-initiating.
Please let me know if you have any modifications to these measures or any concerns with moving forward in this direction.
Thank you!
Ryan Winkleman | Project Manager/Senior Biologist/Certified Senior Ecologist
5 Hutton Centre Drive, Suite 500 | Santa Ana, CA 92707 | [O] 949-330-4115 | [M] (949) 533-0918
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