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• � � . • t <br /> ACTON <br /> MICKELSON <br /> ENVIRONMENTAL, INC. <br /> Consulting Scientists, Engineers, and Geologists <br /> RECEIVED <br /> AUG 19 2002 <br /> ENVIRONMENT HEALTH <br /> August 16, 2002 1ERMIT/1gyI6%mi ht Mail <br /> Mr. Brian Taylor <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827 16014.02 <br /> Subject: Semi-Annual Ground Water Monitoring Report, Second Half 2002 <br /> Former Georgia-Pacific Corporation Chemical Packaging Facility <br /> 75 West Valpico Road, Tracy, California <br /> Dear Mr. Taylor: <br /> Enclosed for your review is the document entitled Semi-Annual Ground Water Monitoring <br /> Report, Second Half 2002, detailing results of the monitoring event conducted July 25 and 26, <br /> 2002, at the former Georgia-Pacific Corporation Chemical Packaging Facility, 75 West Valpico <br /> Road, in Tracy, Califomia(site). <br /> The inferred flow direction and hydraulic gradient for the second half 2002 are consistent with <br /> those in previous monitoring events. The chloroform concentrations reported in samples <br /> collected from site monitoring wells ranged from less than the laboratory reporting limit of <br /> 0.5 micrograms per liter (pg/L) to 39 pg/L. The analytical results for the second half 2002 are <br /> consistent with historic trends and demonstrate that the chloroform plume is generally stable or <br /> contracting. The plume's upgradient edge appears to remain undefined, however, as the sample <br /> from monitoring well MW-21 was reported to contain chloroform at 34 pg/L. A work plan <br /> proposing additional soil and ground water investigation in the vicinity of monitoring well <br /> MW-21 is currently under preparation. The next monitoring event at the site is scheduled for <br /> January 2003. <br /> CAWP\2002 Letters\02-217Am <br /> 5049 Robert J.Mathews Parkway,Suite 200 (916)939-7550 <br /> El Dorado Hills,California 95762 Fax(916)939-7570 <br />