projects > Biscayne Bay coastal wetlands well-site data acquisition > scope of work
Project Scope of Work
Project Scope of Work 2003
Biscayne Bay Coastal Wetlands Well-Site Data Acquisition
2. Objective. The objectives of this data acquisition project are to complete the downhole geophysical logging including video and flowmeter logging of two core holes (9A and 11A, Fig. 1), which are the deepest wells at monitor well sites 0009AB and 0011AB (Fig. 1). The USGS staff will provide and run gamma ray, fluid conductivity and temperature, EM-induction, 3-arm caliper, full wave form sonic tools, a heat-pulse flow meter, spinner flowmeter, an OBI-40 Mark III digital optical tool, the Laval video tool, and a computed vuggy porosity log. This data will be a benefit to the USGS and the BBCWP as data to fill a regional concept of the Biscayne aquifer.
3. Scope. The Corps will contract with a licensed drilling contractor to install two continuously cored monitor ground water wells in April-May 2004. Prior to completion of the wells, the USGS will complete geophysical logging of these wells. Drilling of the wells is expected to be complete within 2 months after initiation of well drilling. The USGS geophysical logging, processing nad and delivery of the data are expected to be complete within 1 month after the logging has been completed.
The purpose is to provide the Biscayne Bay Coastal Wetlands PDT with knowledgeable hydrogeologic staff with experience in the general area that will provide borehole geophysical and hydraulic data to be used by PDT decision makers in construction of monitor wells and an advanced suite of borehole logs for interpretation of the hydraulics and geology of coastal Biscayne Bay.
The USGS hydrogeologist will be on site while the drill crew develops monitor wells 9A and 11A (Figure 1) for logging and during geophysical borehole logging of the deepest well at each of the two monitor well sites. The site USGS hydrogeologist will: 1) Monitor the drilling contractor for adherence to correct borehole development and preparation for geophysical borehole logging, 2) Run geophysical logs, digital-image logs, video logs, flowmeter measurements, and 3) provide calculated computed vuggy-porosity logs.
USGS staff will run USGS geophysical tools, flow meters, and video tools to log the four core holes and deepest well at each monitor wells 9A and 11A (Figure 1).
The USGS will collect geophysical logs, digital-image and video logs, and flowmeter measurements at wells 9A and 11A.
4. Work Responsibilities of the Parties:
5. Schedule. Oversight of the drilling contractor during development of the well and geophysical logging of the wells will begin shortly after drilling commences at wells 9A and 11A (Fig. 1). It is expected that this will occur prior to May 30, 2004. All deliverables will be available to the PDT within one month of completion of geophysical logging of wells 9A and 11A (Figure 1). The schedule for collecting field data and providing all deliverables included in this scope of work is contingent on the actual start date of the project and drilling contractor's ability to provide borehole conditions that will allow collection of all geophysical logs, digital-image and video logs, and flowmeter measurements.
Statement of Work for Amended Work in support of L-31 North Canal Seepage Management Pilot Project
Downhole Geophysical Logging Support
1. Introduction. The L-31 North Canal Seepage Management Pilot Project is intended to curtail easterly seepage emanating from within Everglades National Park (ENP). The pilot project is examining various seepage management technologies as well as operational changes that could be implemented to reduce the water losses from ENP. This project is in close proximity to Biscayne Bay so an effort has been made to combine ongoing work efforts at the two project areas.
The project objective as developed by the L-31 North Project Delivery Team is:
"The purpose of this project is to determine the appropriate technology needed to control seepage from the Everglades National Park and provide the appropriate amount of wet season groundwater flow that will minimize potential impacts to the Miami-Dade County's West Wellfield and freshwater flows to Biscayne Bay."
Seepage emanating from ENP and traveling east is discharged to multiple sinks. First, a large percentage of seepage is discharged into the L-31 North Canal. Historical estimates and recent estimates prepared for the Seepage Management project suggest that total seepage into the L-31N Canal between Tamiami Trail and the G-211 structure amounts to a daily average of 250 to 500 cubic feet per second (cfs) (COE, 1952; Klein and Sherwood, 1961; Klein and Hampton, 1971; SFWMD, 1991; COE, 1999; USGS, 2002; COE, 2003). Second, seepage not captured by the L-31N Canal flows beneath the L-31 N Canal toward the east. The West Miami-Dade well field collects a portion of this seepage while the rest flows further toward the east to be discharged into local Miami-Dade County canals and Biscayne Bay. The distribution of seepage into the L-31 North Canal and beneath it is not known with any degree of certainty today. A canal draw down experiment is proposed to provide additional field data that will be utilized to refine seepage estimates in the study area as well as determine aquifer parameters in the study area. The canal drawdown experiment will be completed in two phases. First, a dry-season test would be conducted toward the end of May 2004. Second, a wet-season test would be conducted in late July 2004. Both portions of the test are envisioned to be at least four days in duration. During the test multiple sets of hydrologic instrumentation would be monitored on a continual basis. In addition, during the dry-season test, downhole flow logging would be completed in two open-hole interval wells adjacent to the L-31N Canal. It is envisioned that the United States Geological Survey (USGS), Miami Field office would provide the expertise and equipment to perform the required down-hole logging.
2. Scope. The USGS will acquire geophysical logs using the fluid conductivity and temperature probes, and heat-pulse and spinner flowmeters at two coreholes specified by the USACE and funded by the L-31N Seepage Management Pilot project. Two coreholes will be logged during the second day of the 48-hour duration of the drawdown test. The drawdown test will be conducted by USACE and South Florida Water Management District personnel in late May or early June 2004, during dry season conditions. The well location and schedule will be coordinated with the USACE POC, Chris Brown, 904-232-1008.
Project schedule for the modification is as follows:
Deliverables: The deliverables will include:
U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 04 September, 2013 @ 02:08 PM(KP)