Phase 1B Underwater Archaeological Report for the Onondaga ...

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FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Anomaly 77: Unidentified Anomaly 77 Summary Table Anomaly Identification Unidentified Remedial Impact Cap and Dredge NRHP Eligibility Unevaluated Recommendation Anomaly Dataset Side Scan (2005) No Magnetometer (2005) 258 Side Scan (2010) No Sector Scan (2010) No ROV (2010) No Diver Observations 6/27/11 Diver Videography No Maps/Charts No Aerial Imagery No Historic Accounts No Research Results Anomaly 77 was co-located with 2005 magnetic anomaly #258, a 98nT dipole at a depth of approximately 5ft (2m) (Figure 98). The ferrous mass estimate for this feature would range from 35 to 540lb (16 to 245kg) at an assumed range of 7 to 16ft (2 to 5 m). The lakebed was obscured by aquatic vegetation in 2005 side scan sonar data. A77 was investigated by a diver in 2011. The area is filled with metallic trash including a tin can, zinc attachment for a boat and a small metal fragment. Despite extensive visual survey and metal detection, no features were found that were the likely source of the original magnetic anomaly, and therefore the results are inconclusive. Although the specific origin of the magnetic anomaly is unknown, its signature lacks the complexity and intensity expected of a larger cultural resource. LCMM believes the collective data suggests that it is likely isolated ferrous debris. Recommendations LCMM recommends no further work for A77. 145
FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Figure 98. Graphical overlay of fine-scale magnetism and side scan data on A77 and A79 (courtesy CRE). 146
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Phase 1B Underwater Archaeological Report for the Onondaga ...

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