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sir+ <br /> HOLGLIN, FAHAN Mr. Michael J. Infurna <br /> &ASSOCIATES INC. SJ C E H D <br /> ENVIRONMENTAL MANAGEMENT CONSULTANTS August 17, 2009 - Page 2 f <br /> present an unacceptable safety and environmental risk. As such, pressure grouting is <br /> recommended for abandonment of well MW-10. <br /> • <br /> MW-11D: this well is installed inside a 10-inch-diameter steel conductor casing. Records <br /> indicate that this conductor casing extends to 70 feet below grade (fbg). Overdrilling would <br /> present a risk of damaging the integrity of the annular seal surrounding the outside of the <br /> conductor casing and removing the conductor casing presents an unacceptable safety risk. <br /> As such, pressure grouting is recommended for abandonment of well MW-1 1 D. <br /> HFA hereby requests a modification to the existing well destruction permit for the Site (permit <br /> #057985) to authorize abandonment of the above-referenced wells by pressure grouting. All <br /> other wells covered by the revised permit-will be abandoned by overdrilling. <br /> Holguin, Fahan & Associates, Inc. trusts that this work plan addendum meets the requirements of <br /> the San Joaquin County Environmental Health Department. If you have any questions or require f <br /> additional information, please contact Mr. Eli Scott at (805) 641-4091 or Eli_Scott@hfa.com. <br /> Respectfully submitted, <br /> L � I <br /> f <br /> Elias W. Scott Mark R. Fahan, PG, REA <br /> Associate Environmental Scientist Vice President <br /> Holguin,, Fahan & Associates, Inc. Holguin, Fahan & Associates, Inc. <br /> EWS:mrf:mgh <br /> cc: Ms. Stephanie A. (Furgal) McKenna, Chevron EMC <br /> Mr.James L.L. Barton, PG, California Regional Water Quality Control Board, Central <br /> Valley Region (5) <br /> Mr. Duncan Austin, California Regional Water Quality Control Board, Central Valley <br /> Region (5) 11 <br /> Mr. Phil Johnson, Sims-Group Management <br /> Mr. Mark A. Adams, Point Environmental <br /> I <br /> AL <br /> MAW <br /> GFO�o <br /> a� MARK R. FAfiAN <br /> MAMER 4279 <br /> CP <br /> �A EXP 7/10 <br /> 9�FoF cAL��°Q. <br />