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i � <br /> ACTON AUG 15 2003 <br /> MICKELSON <br /> ENVIRONMENTAL 9 INC. ENVIRONMENT HEALTH <br /> PFRMITISE VR ICES <br /> Consulting Scientists, Engineers,and Geologists <br /> August 14,2003 <br /> Ms. Devra Lewis <br /> Private Sites Cleanup Unit <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A 16014.02/7 <br /> Sacramento, California 95827 <br /> Subject: Semi-Annual Ground Water Monitoring Report, Second Half 2003 <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, Second Half 2003, presenting the <br /> results of the monitoring event conducted July 2 and 3, 2003, 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 first half 2003 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 /> (pg/L) to 55 pg/L. The reported chloroform concentration in several monitoring wells trended up <br /> this monitoring event. However, the maximum reported chloroform concentration in site ground <br /> water, currently 55 pg/L, remains significantly below historic values. The next monitoring event at <br /> the site is scheduled for January 2004. <br /> Please call either of the undersigned at (916) 939-7550 should you have any questions regarding the <br /> material presented. <br /> Very truly yours, <br /> ACTON a MICKELSON•ENVIRONMENTAL,INC. <br /> Robert L. Hammond / ara J. Mickelson <br /> Project Engineer California Registered rofessional <br /> Engineer#43417 <br /> RLH:BJM:ddb <br /> cc: Ms. Julie Raining, 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 /> CAWP\2003 Letters\03-234.do <br /> 5175 Hillsdale Circle,Suite 100 (916)939-7550 <br /> Fax(916)939-7570 <br /> EI Dorado Hills,California 95762 <br />