Executive Summary Introduction Study Area & Objective Methods Results Summary & Recommendations Acknowledgements & References >Statement of Work Appendix A Appendix B PDF Version

Introduction

The South Florida Water Management District (the District) and the US Geological Survey (USGS) have agreed to cooperatively work on a project to complete a high resolution, marine seismic reflection profile of the area around several Comprehensive Everglades Restoration Program (CERP) projects. High resolution, marine seismic reflection profiling is a surface geophysical technique that can be used to identify sub-bottom geologic features beneath bodies of water. The District needs to develop an understanding of the geology underlying a number of areas, including the following:

• near the proposed Lake Belt Reservoir and Pilot Study,
• near the L31N Seepage Management Project and Pilot Study,
• near the C-43 Reservoir and ASR projects,
• near the Hillsboro reservoir, and
• the perimeter canals near the Lake Okeechobee ASR project.

The District is particularly interested in identifying:

• stratigraphic layers and consistencies,
• solution features and anomalies,
• unconformities,
• changes in stratigraphy that can affect the interaction between ground-water and surface water, and
• potential paths of preferential flow.

Characterization of the stratigraphy to a depth of about 200 feet below land surface is considered critical to the success of the projects. Analysis of the seismic data may identify sites for further detailed geologic investigation. The US Army Corps of Engineers (USACE) is a partner to the District on all CERP projects.

Scope of Services

Scope of Work

The Lake Belt Reservoir Pilot Project and the L31N Seepage Management Pilot Project are the primary focus of this agreement. If time permits, some seismic profiling may be done in other areas. The USGS will complete high-resolution single channel marine seismic reflection profiling on up to 90 km of canals within the project areas. It is possible that one day of the work may be done on small lakes in the vicinity of the Lake Belt Reservoir and L31N Seepage Management Projects. The seismic reflection profile project area is shown on the map in Appendix A. The District, USGS, and USACE will select specific sites based on project needs, physical accessibility, and canal water levels. Staff from the District and USGS have visited a number of Lake Belt Reservoir and L31N area sites. Data from this visit will be used in planning the seismic profiling.

The USGS will:

1. Provide all necessary equipment and supplies to run high resolution marine seismic reflection profiling for up to 90 km.
2. Provide an appropriate sized boat to carry all equipment and staff. Staff may include one District/USACE technical observer.
3. Provide all necessary staff to run high resolution marine seismic reflection profiling for the duration of the project.
4. Work with District and USACE staff to plan the seismic profiling.
5. Obtain permission for ingress and egress at each project site, when necessary. The District and the USACE will assist the USGS with this task, as appropriate.
6. Collect and log real-time GPS data concurrently with the collection of the marine seismic reflection profiling. Horizontal data will be reported in 1983 NAD datum and vertical data will be reported in both 1929 NGVD and 1988 NAVD datum.
7. Provide post processing of the data to remove multiples or provide filtering to remove selected bandwidths.
8. Store and maintain all original seismic data and provide access to this data for reproduction as needed by the District and the USACE.
9. Prepare an interim report to include the following:
   1. A copy of the seismic field data and
   2. Field notes and aerial photographs designating alignments including start and finish locations, start and finish times, and start and finish stages.
10. Provide a final report/data package in formats acceptable to both the District and the USACE. This may necessitate the use of two formats. (Formats will be established by the SFWMD, the Corps, and the USGS prior to beginning the profiling.) The final report will include a comprehensive interpretive report and the following:
    1. Six printed copies of all seismic data.
    2. Six hard copy plots of locations of tracklines with identifying labels for correlation to seismic data (i.e. latitude/longitude, start location, start time, canal stage at start of transect, state planar coordinates, finish location, finish time, canal stage at end of transect, and elevations.)
    3. Digital ASCII text navigation files in either of the following formats: latitude (dms), longitude (dms), time or UTM easting, UTM northing.
    4. Electronic (CD) copies (6) of digital seismic data files.
    5. Maps of each of the study areas.

The SFWMD will:

1. Provide equipment and staff to launch and pull the boat from the water when a boat ramp is not readily accessible.
2. Assist the USGS to obtain permission for ingress and egress at each project site.