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 70: Unidentified Anomaly 70 Summary Table Anomaly Identification Unidentified Remedial Impact Dredge and Cap NRHP Eligibility Unevaluated Recommendation Anomaly Dataset Side Scan (2005) No Magnetometer (2005) 789, 790, 802, 803, 804, 805, 822 Side Scan (2010) No Sector Scan (2010) No ROV (2010) No Diver Observations 6/25/11 Diver Videography No Maps/Charts No Aerial Imagery No Historic Accounts No Research Results Anomaly 70 was surrounded by seven magnetic anomalies digitized from three parallel transects of 2005 magnetic data (see Figure 97): #789, a 10nT dipole (~ 4.4 to 55lb [2 to 25kg] ferrous mass) #790, a 42nT negative monopole (~18 to 220lb [8 to 100kg] ferrous mass) #802, a 77nT dipole (~26 to 419lb [12 to 190kg] ferrous mass) #803, a 24nT dipole (~9 to 132lb [4 to 60kg] ferrous mass) #804, a 25nT negative monopole (~9 to 138lb [4 to 63kg] ferrous mass) #805, an 18nT dipole (~7 to 99lb [3 to 45kg] ferrous mass) #822, a 55nT dipole (~20 to 309lb [9 to 140kg] ferrous mass) The lakebed at this location was obscured by aquatic vegetation in 2005 side scan sonar data. Anomaly 70 was not located despite extensive visual diver examination and metal detecting in 2011. 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 on A70. 143
FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Anomaly 74: Isolated Piling Anomaly 74 Summary Table Anomaly Identification Isolated Piling Remedial Impact Dredge and Cap NRHP Eligibility Unevaluated Recommendation Anomaly Dataset Side Scan (2005) No Magnetometer (2005) No Side Scan (2010) No Sector Scan (2010) No ROV (2010) No Diver Observations 6/26/11 Diver Videography No Maps/Charts No Aerial Imagery No Historic Accounts No Research Results Anomaly 74 was located by a diver in 2011. This isolated piling approximately 12in (30cm) in diameter stands 12in (30cm) off the bottom at a 45 degree angle. It is likely a piling from one of the adjacent dolphins that has torn loose. Recommendations LCMM recommends no further work for A74. 144
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