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Well Upgrade Technical Report
Section 1 - Introduction
This report describes three well upgrades performed for Camp Stanley Storage Activity (CSSA), between December 14, 1995 and November 11, 1997. The upgrade work was performed under the Air Force Center for Environmental Excellence (AFCEE) contract F41624-94-D-8136, delivery order 002301. AFCEE and its subcontractor, Booz-Allen, and Hamilton, Inc. also provided technical oversight. The December 1995 work was conducted by a Parsons subcontractor under a previous contract with United States Air Force (USAF) Armstrong Laboratory/OEB. Parsons. provided oversight to several subcontractors for this task. ECO2 Solutions was subcontracted by Parsons to provide treatment of the wells with carbon dioxide, and Venture II, Inc. was subcontracted to remove the pump and piping from CSSA�s Well CS-11.
Well upgrade work was approved by the Texas Natural Resources Conservation Commission (TNRCC) on April 8, 1997 (Appendix A). All well upgrade work was performed in accordance with information supplied to the TNRCC on March 12, 1997 and TNRCC�s Chapter 290-Rules and Regulations for Public Water Systems. A written log of the downhole camera surveys may be found in Appendix B. A VHS video copy of each camera survey was provided to CSSA and Parsons on November 27, 1997.
The upgrades were performed on three wells to enhance CSSA�s existing capability to provide post-wide potable water and fire suppression reserves. Wells CS-1, CS-9, and CS-11 were specified by the delivery order scope of work (SOW) for upgrades. The upgrade for Well CS-1 included a downhole camera survey, installation of new surface casing to a depth as determined from the camera survey, installation of e-line tubing, treatment of the well with carbon dioxide, and installation of new column pipe and submersible pump. The upgrades for Wells CS-9 and CS-11 included downhole camera surveys, installation of e-line tubing, treatment of the wells with carbon dioxide, installation of new column pipe, and the installation of a new submersible pump at Well CS-11. Treatment of the wells with carbon dioxide, a proprietary well enhancement technique, was conducted by ECO2 Solutions. Well development after carbon dioxide treatment was also performed by ECO2 Solutions. CSSA removed and reinstalled the prefabricated building for Wells CS-9 and CS-11, and provided access to Well CS-1.
The downhole camera survey provided information to assist in determining surface casing condition and extent: borehole condition, lithologic character to aid in setting depth for carbon dioxide injection pipe, and total depth. Available well information, particularly for Well CS-1, was unreliable. Surface casing replacement in Well CS-1 was intended to block possible contaminant routes that might contribute to repeated water quality failures of the bacterial tests required for public water well testing by regulations. The carbon dioxide treatments were intended to enhance well yield, and in conjunction with redevelopment, reduce silting at Well CS-11. Pump and column pipe removal at Well CS-11 were performed December 14, 1995, prior to selection of the well treatment method and vendor.