SOLICITATION NOTICE
B -- HELICOPTER TIME DOMAIN ELECTROMAGNETIC SURVEY TO DETECT FLODDED MINES
- Notice Date
- 6/20/2005
- Notice Type
- Solicitation Notice
- Contracting Office
- 3610 Collins Ferry Road (MS-I07) P.O. Box 880 Morgantown, WV 26507-0880
- ZIP Code
- 26507-0880
- Solicitation Number
- DE-RQ26-05NT50606
- Response Due
- 7/7/2005
- Archive Date
- 8/6/2005
- Small Business Set-Aside
- N/A
- Description
- ITLE: DEA TECHNICAL STUDY PARTICIPATION. DESC: The U.S. Department of Energy???s National Energy Technology Laboratory (NETL), Pittsburgh, PA intends to award a purchase order on a sole-source basis to SkyTEM APS, Denmark, The Neatherlands for Helicopter time-domain electronmagentic survey of Pittsburgh Mine Pool using system with null-position receive and dual dipole moment transmitter in accordance with the statement of work listed below. STATEMENT OF WORK: Helicopter Time Domain Electromagnetic Survey to Detect Flooded Mines This requisition is for a helicopter time domain electromagnetic survey of three areas in Westmoreland, Washington, and Greene Counties in southwestern Pennsylvania, USA. A map of the flight areas that shows topographic features, cultural features, and overburden depth can be obtained by contacting Rick Hammack (412) 386-6585; email hammack@netl.doe.gov. The purpose of the survey is to detect and map flooded underground mines that occur at depths ranging from 50 m to 200 m. The thickness and conductivity of the mine pool conductor is 3 m and 200-1000 mS/m, respectively. The average conductivity of overlying and underlying layers is estimated to be 20 mS/m. The surveys will total 450 line kilometers (including replication of every 10th line and tie lines, if needed) and be flown at an interline spacing of 200 meters. Before being considered for this survey, each respondent must provide forward modeling evidence to show that their system can detect a 3-m thick mine pool with a conductivity of 1000 mS/m (modeled as an infinite conductive layer) beneath 150 m of overburden with an average conductivity of 20 mS/m. The respondent will provide everything needed to conduct the survey including helicopter, pilot, time domain electromagnetic instrument, field crew, and all fuel, supplies, and replacement parts. The total cost is to include mobilization/demobilization costs plus the cost of ferrying helicopter and equipment from site to site. The respondent will process selected lines of data acquired each day and provide results to an independent QA/QC reviewer and NETL personnel. The QA/QC reviewer, NETL personnel, and the airborne contractor will meet daily to discuss changes in instrumental parameters or flight plan that might improve survey results. When possible, these changes will be implemented by the airborne contractor on the next day???s flight. One of every ten flight lines will be reflown, either in the same direction to determine repeatability or in the opposite direction to determine spatial consistency. Further, NETL will require that flight lines be reflown when repeated flight lines show that results are not repeatable within an average of 10 pct in rhoa. The comparison is made on altitude corrected data and data must be measured on the same GPS location within a few meters. NETL will not compensate the airborne contractor for flight lines where the acquired data do not meet the requirements. However, NETL will compensate the airborne contractor for lines with acceptable data that are reflown at NETL???s request. Where available, NETL will provide the airborne contractor with down-hole induction conductivity logs from drill holes in the vicinity of flight areas. The location of drill holes will be supplied so that the airborne contractor can hover at these sites for the purpose of obtaining a priori data for the inversion model and for translation of the model layer resistivities to the geological settings. The airborne contractor will return to a test site close to the base station at each take off and landing to acquire a sounding. These soundings should be repeatable within 10 pct in rhoa when altitude corrected. A high altitude (out of the earth???s effect) sounding shall be made before and after the survey period if the weather permits. The airborne contractor will provide raw survey data to NETL and the QA/QC reviewer in a digital format (eg. a XYZ file or tem files) at the end of each survey day. Processed data is provided for selected lines. The contractor also will generate layered earth inversions that show the location of the target mine pool to the maximum depth possible. The layered earth inversions will be provided to NETL no later than 2.5 month after the completion of the survey. This request is considered to be sole source to SKYTem APS. Therefore, no solicitation will result from this announcement. This award shall be awarded using FAR 13, Simplified Acquisition Procedures. This purchase order is to be issued to SkyTEM APS because the vendors product is unique and there is not another similar device. The SkyTEM helicopter time domain electromagnetic (TDEM) system is believed to be the only TDEM system capable of detecting conductive pools of water within underground coal mines at depths greater than 100 m. Support for this conclusion comes from forward modeling the response of various airborne TDEM systems to mine pool type targets. The modeling results indicate that the relatively high noise levels in all commercial systems except SkyTEM will prevent the detection of the mine pool at depths exceeding 100 m. This is because most airborne TDEM systems were developed to detect commercial-size orebodies that are larger, more conductive, and generally deeper than the conductive water in the mine pools of the Pittsburgh Coalbed. For these systems, exploration depth is of more importance than the ability to resolve weak conductors at relatively shallow depths that may have only a 10-fold conductance contrast between the target layer (mine pool) and overlying and underlying layers. Unlike other airborne TDEM systems, the SkyTEM system was developed for groundwater exploration with low-contrast targets and where high resolution in the 0 to 300-m depth range is absolutely essential. The SkyTEM system has several features that permit higher resolutions to be achieved. First, the SkyTEM is the only system that uses two dipole moments, a low moment for low-noise data at early times that results in high resolution in the near surface, and a high dipole moment for detection of targets at greater depths. Second, in the SkyTEM system, the receiver is positioned in a low-field or null position with respect to the transmitter. This results in less transmitter-induced noise in the receiver and permits earlier time gates with lower noise floors, thereby increasing resolution. Finally, the SkyTEM uses large amounts of data stacking to further reduce the already low noise levels of the system. In previous research, NETL unsuccessfully attempted to detect mine pools using a helicopter TDEM system with coincident loop transmitter-receiver geometry, the geometry used by all commercial helicopter TDEM systems except SkyTEM. Although numerous factors contributed to the failure of this test, the high noise levels observed in data from the coincident-loop system made resolution of the thin, weakly conductive mine pools impossible. The current research attempts to correct mistakes made in the initial test and to improve the likelihood of detecting conductive mine pools by using a low-noise system such as SkyTEM. All responsible sources may submit a bid, proposal, or quotation which shall be considered by this agency. Offerors shall provide sufficient technical literature, documents, etc., in order for the Government evaluation team to make an adequate technical assessment of the quote as meeting technical acceptability. The purchase order shall be awarded on the basis of low cost. The Contracting Officer is Mr. Robert L. Mohn, FAX 412-386-5770. The Technical Representative for the above requirement is Mr. Rick Hammack 412-386-6585, email hammock@netl.doe.gov. All bids, proposals, or quotations must be received by 5:00 pm Eastern Time, July 7, 2005.
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- Record
- SN00832543-W 20050622/050620211743 (fbodaily.com)
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