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 6: Solvay Waste Shelf Anomaly 6 Summary Table Anomaly Identification Solvay Waste Shelf Remedial Impact Dredge and Cap NRHP Eligibility Unevaluated Recommendation Anomaly Dataset Side Scan (2005) 30 Magnetometer (2005) 1256, 475 Side Scan (2010) 6/2/10 Sector Scan (2010) 6/6/10 ROV Video Footage (2010) 6/9/10 Diver Observations (2011) 6/21/11 Diver Videography No Maps/Charts No Aerial Imagery No Historic Accounts No Research Results A6 is co-located with CRE’s 2005 digitized magnetic anomalies #475 and #1256 which were observed on parallel survey transects spaced 25ft (8m) apart at a depth of approximately 8ft (2m). The magnitude of these anomalies was approximately 10-15nT. Assuming a distance (range) of 7-16 ft (2-5 m), the ferrous mass of this anomaly might be 4.4 to 84lb (2 to 38kg). High resolution side scan sonar data collected in the vicinity of these anomalies in 2010 showed some isolated debris, but nothing characteristic of a cultural resource (Figure 72 and Figure 73). The ROV revealed the area to be flat bottomed with no vegetation and a layer of easily disturbed fine silt and green algae. The ROV did not locate the source of the anomaly. The area has dense aquatic vegetation with open areas of solvay waste. Diver verification in 2011, which included visual examination and metal detecting, did not locate any cultural material. The cumulative geophysical and observational data suggests that the original side scan anomaly was likely a result of the solvay waste shelf. The magnetic target is buried and remains unresolved, however, its low magnetic amplitude and limited spatial extent suggests that the target is the result of isolated ferrous debris rather than a larger, more complex archaeological property. Recommendations LCMM recommends no further work for A6. 103
FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Figure 72. Side scan sonar mosaic of A6 104
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