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Mr. Philip S. Isorena <br />December 12, 2001 <br />Page 2 <br />sampling of four monitoring wells (MW -5R, MW -6, MW -11, and MW -12) will occur in <br />alternate quarters (November and May). Water level measurements will continue to be <br />conducted quarterly to confirm that the groundwater capture area is being maintained. <br />Standard treatment system and extraction well O&M inspections and sampling of the <br />GWETS ports will continue to be performed bi-weekly to assure continuous system <br />operation and for compliance with the City of Stockton discharge permit. Only the <br />sampling and analysis of the six extraction wells will be reduced from monthly to bi- <br />monthly. <br />Implementation of the above -referenced changes commenced in November 2001. If you <br />have any questions regarding this letter, call me at our Oakland office at (510) 273-3623 <br />or contact Mr. William Barber at (216) 271-8038. <br />Very truly yours, <br />PARSONS <br />—0 - <br />Frederick C. Ki zer, C.E.G. <br />Project Manager <br />cc: Mr. William Barber, BP Amoco Corp. <br />Ms. Margaret Lagorio, San Joaquin County PHS, Environmental Health Div. <br />Mr. Lon Kitagawa, Applied Aerospace Structures Corp. <br />confirmation letter.doc <br />