Geophysical Survey. The survey aim was to locate any possible marine archaeological resources on the seabed. On the instructions of the Geotechnical Engineering Office (GEO) of Civil Engineering & Development Department (CEDD), Works Order No. GE/2005/26, a geophysical survey was conducted by XXXX. The full data set was passed to SDA Marine Ltd for analysis and interpretation.
Geophysical Survey. 5.2.1 SIDE SCAN SONAR SURVEY The digital side scan sonar data was analysed. It showed that the seabed within the study area is mud or fine sand. There is also evidence of trawl marks, debris and dumped materials. The location and size of all these features were marked and shown on Chart Figure 2 attached. Below are examples of the actual data collected. The exact location of each of these examples is shown on ChartFigure2 attached. Figure 10: Side scan sonar data showing modern dumped material Figure 11: Side scan sonar data showing deeply incised trawl marks Figure 12: Side scan sonar data showing a large pit on the seabed. Figure 13: Side scan sonar data showing a boulder on the seabed
Geophysical Survey. Detailed examination of the geophysical survey data enabled accurate assessment of the seabed within the study area. The area is characterised by extensive disturbance as evidence by trawl marks and modern dumped material. This is compatible with its location within one of the busiest sections of Victoria Harbour and adjacent to existing reclamation and engineering works. These activities would have a negative impact on the seabed thereby reducing its archaeological potential. It is therefore concluded that there are no archaeological resources within the study area.
Geophysical Survey. The nature, geometry, and thickness of permeable deposits in each fringe area can only be estimated using well and boring data collected as part of Task 1. Often, the location of borings and xxxxx that we have logs for is not well known. To better understand the spatial distribution of the deposits and variability, additional investigations, including advancement of borings or installation of monitoring xxxxx, would be needed. Because these methods are expensive, time-consuming, and invasive, we propose to conduct a demonstration TDEM geophysical survey performed by Ramboll Environ in one of the fringe areas to determine the applicability of this approach for meeting the objectives of our characterization efforts and to add credibility to a scientific boundary modification request, if pursued. The survey lines would be located so that geologic strata described in logs for nearby xxxxx can be correlated to the survey results and verified. The purpose of the geophysical survey is to:
Geophysical Survey. The report shall include:
Geophysical Survey. The Consultant is responsible for performing verification geophysical survey, if the existing information is deemed unreliable or un-usable or in the case where supplementary information is required. The scope is therefore limited to what is considered necessary in this respect. The Consultant provides proposals for the geophysical survey for the Employers acceptance before any investigations are conducted. The scope of the geophysical survey includes, but is not limited to, the following activities: Geophysical survey is conducted within the Scope Area as defined above; Geophysical scanning is adopted to locate sub-surface utilities both metallic and non-metallic; The type of geophysical scanning employed is at the discretion of the appointed Surveyor, taking note of the required output as stated in point b; The scanning area is located on an active construction site; therefore the appointed Surveyor considers: The working environment prior to selection of test methodology and equipment; and Possible signal interferences which may affect the geophysical scanning equipment caused by equipment and services (live or dormant) in and around the proposed scanning areas; and Scanning is conducted to a minimum depth of 5m to 7m.
Geophysical Survey. The portion of 34SQ76 to be impacted (roughly 8 acres) will be subject geophysical survey to identify areas within that exhibit signatures consistent with archaeological features. The geophysical studies will be conducted by a professional with demonstrated experience in producing quality documentation and reporting for similar archaeological resources. Means and methods for the ensuing excavations and data recovery will be informed by the professional recommendations of the geophysical technician and may include multiple methods. The study will culminate in a professional report that will illustrate anomalies that may be consistent with archaeological features.
