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MEMORANDUM
TO: Board of Supervisors
FROM: Scott De Leon, Public Works Director
DATE: September 25, 2018
SUBJECT: Consideration of Contract Change Order No. 1 for Mockingbird Lane at Robinson Creek Bridge Replacement Project, Federal Project No. BRLO-5914(105); Bid No. 18-01
EXECUTIVE SUMMARY:
Attached for the Board's review and approval is Contract Change Order (CCO) 1 for the subject project.
Paint on the existing bridge railing was found to contain lead and other heavy metals requiring that a Lead Compliance Plan be prepared, per contract specifications, to handle, store, transport and dispose of debris produced when the existing paint is disturbed.
Biological monitoring survey prior to the demolition of existing bridge led to the discovery of an active pacific-slope flycatcher (Empidonax difficilis) nest, under the bridge, containing two (2) chicks. Consultation with the California Department of Fish & Wildlife (CDFW), as required by the Streambed Alteration Agreement, resulted in establishment of a 100-foot non-disturbance buffer zone around the nest where no construction activity would be permitted until the chicks had fledged. As a result, all construction activities were halted effective July 11, 2018.
On July 25, 2018, a subsequent biological monitoring survey confirmed that the nest was no longer active; however, it led to the discovery of approximately fifteen (15) bats (Myotis sp.) and one (1) big brown bat (Eptesicus fuscus) roosting in a crevice under the existing bridge deck. CDFW required that a Bat Exclusion Plan be submitted and then implemented upon approval.
Subsequent to the discovery of the bats, but prior to the implementation of the Bat Exclusion Plan, a mandatory evacuation order for the Mendocino Complex Fire was issued, which continued the work stoppage through August 12, 2018. After the mandatory evacuation order for the Mendocino Complex Fire was lifted for the project area, the Bat Exclusion Plan was implemented an...
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