Department of the Interior, U.S. Geological Survey, 345 Middlefield Road,Mail Stop 285, Menlo Park, CA 94025-3591

99 -- DRILLING OF TEST HOLE AND INSTALLATION OF MONITORING WELL(S) DUE 011298 POC Richard C. Schwaberow, Contracting Officer, (650) 329-4171, fax (650) 329-5517 PROCESS TO POINT OF AWARD PENDING AVAILABILITY OF FUNDS The U.S. Geological Survey (USGS) Menlo Park, California has a requirement for drilling of test hole and installation of monitoring well(s) near Fallon, Nevada in Churchill County. The purpose of the test hole and wells is to obtain geologic, water level and water chemistry data at different depths in and near the Fallon basalt aquifer. The upper portion of the hole will be drilled through approximately 400 feet of basin-fill sediments (gravel, sand, silt and clay) overlying the basalt aquifer. The lower portion of the hole will be drilled through the basalt and possibly into an underlying sedimentary aquifer. The thinkness of basalt aquifer to be drilled is decribed by three alternative test hold and well designs (contained in the Statement of Work). The holes and permanent steel casing shall be of minimum diameter to meet Nevada State Regulations and allow test hole drilling and installation of monitoring wells, as described by the Alternatives (contained in the Statement of Work)., constructed of 2 inch diameter, flush-joint threaded Schedule 80 PVC casing and screen at specified depths and emplacement of gravel pack near screened intervals and bentonite grout between screened intervals using a tremie pipe. Listed diameters are suggested minimum nominal values. Nevada State Regulations require the test hole to be 4 inches greater than the diameter of a single casing, or the combined diameter of multiple casings. A Site Visit is scheduled for December 29, 1997, 10:00AM PST. Prospective bidders must contact the COR Representative Doug Mauren at (702) 887-7631 to ensure that they will be attending the site visit. This must be done prior to 5:00pm PST on December 23, 1997. The on-site driller shall be licensed by the State of Nevada as a well driller. All work shall conform to applicable state and local requirements. Water and electrical power are not available at the site. Exact location is contained in the Statementof Work. Request for quotation and applicable (FAR) Federal Aquisition Regulations along with the statement of work (SOW) will be provided to prospective bidders prior to the site visit by contacting the Contracting Officer prior to 3:00pm, PST, December 19, 1997 (0342)

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