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ACTON • <br /> MICKELSON • <br /> ENVIRONMENTAL, INC. <br /> Consulting Scientists,Engineers,and Geologists <br /> April 27,2004V �� <br /> Ms. Devra Lewis <br /> Private Sites Cleanup Unit APR 2 9 2004 <br /> California Regional Water Quality Control Board <br /> Central Valley Region ENVIRONMENT HEALTH <br /> 11020 Sun Center Drive#200 PERMIT/SE <br /> ♦jVl&FD$2/7 <br /> Rancho Cordova,California 95670 16 1 <br /> Subject: Semi-Annual Ground Water Monitoring Report, First Half 2004 <br /> Former Georgia-Pacific Corporation Chemical Packaging Facility <br /> 75 West Valpico Road, Tracy, California <br /> Dear Ms. Lewis: <br /> Enclosed is the Semi Annual Ground Water Monitoring Report, First Half 2004, presenting the <br /> results of the monitoring event conducted January 20 and 21, 2004, at the former Georgia-Pacific <br /> Corporation Chemical Packaging Facility, 75 West Valpico Road, in Tracy, California(site). <br /> The inferred flow direction and hydraulic gradient for the fust half 2004 are consistent with those in <br /> previous monitoring events. The chloroform concentrations reported in samples collected from site <br /> monitoring wells ranged from less than the laboratory reporting limit of 0.5 micrograms per liter <br /> (µg/L) to 49 pg/L. The analytical results for the first half 2004 are generally consistent with historic <br /> trends. The next monitoring event at the site is scheduled for July 2004. <br /> Please call me at(916) 939-7550 should you have any questions regarding the material presented. <br /> Very truly yours, <br /> ACTON•NUCKELSON•E NTAL,INC. <br /> Z� <br /> r ara .Mick on,P.E. <br /> California Registered Professional <br /> Engineer#43417 <br /> BJM:ddb <br /> cc: Ms. Julie Raming, Georgia-Pacific Corporation <br /> Mr.Michael Infurna, San Joaquin County,w/o appendices <br /> Mr. Steve Bayley, City of Tracy Public Works Department,w/o appendices <br /> Mr.Nick Pinhey, City of Tracy Public Works Department,w/o appendices <br /> CAWA2004 Letters\04-091doe <br /> 5175 Hillsdale Circle,Suite 100 (916)939-7550 <br /> EI Dorado Hills,California 95762 Fax(916)939-7570 <br />