Section 1 Introduction - National Marine Fisheries Service - NOAA

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NBK at Bangor EHW-1 Pile Replacement Project Final <strong>Marine</strong> Mammal Monitoring Report construction area) and at Delta Pier (approximately 1,160 m -1,500 m from the construction area, Figure 7). No Dall’s porpoise or killer whales were observed during construction (or at any other time) during the EHW-1 PRP. The distance to the 180 and 190 dB Level A harassment thresholds never exceeded 3 m (RMDT 2012). The closest marine mammal sighting to pile driving throughout the EHW-1 PRP, a harbor seal, was located 20 m from the pile (Appendix E). Therefore, no injury takes of cetaceans or pinnipeds occurred during the EHW-1 PRP. No cetacean species were sighted within the WRA, including during all marine mammal monitoring associated with the EHW-1 PRP. Table 10 shows allowed versus actual take 3 estimates based on the number of marine mammals observed in the shutdown and buffer zones for cetaceans and pinnipeds during pile driving activities (refer to Appendix F for takes calculated on a per-pile basis). Takes are reported as the number of individuals (not sightings) observed within a given zone. The majority of takes were for California sea lions, the most abundant marine mammal species during the EHW-1 PRP timeframe. All species sighted, with the exception of Steller sea lions, fell within authorized take numbers. One Steller sea lion was observed hauling out at Delta Pier during vibratory pile driving. Because (1) this animal was in the water during construction, and (2) fell within the 120 dB ZOI, it was considered a Level B take (Table 10). Calculation of Average Sound Thresholds. Measured sound threshold distances varied considerably with pile size, substrate type, environmental conditions, and background noise levels. Therefore, average distances to the behavioral harassment thresholds were calculated for the purposes of: (1) visualizing the relative distances to the actual, modeled, and monitored Level B harassment zones (Figure 4) and (2) extrapolating the number of possible Level B takes in the unmonitored ensonified area from known animal density and sighting rates. The average distance to 120 dB threshold for vibratory pile driving was calculated by taking the weighted average of distances to the 120 dB threshold for each pile size and hydrophone depth. Pile sizes were divided into two groups: piles
NBK at Bangor EHW-1 Pile Replacement Project Final <strong>Marine</strong> Mammal Monitoring Report Note: Sightings superimposed on the EHW-1 structure occurred in the water under the cover of the building roof. Figure 7. All California Sea Lion Sightings. Points may represent more than one individual. Bangor, Washington 39
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Section 1 Introduction - National Marine Fisheries Service - NOAA

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