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California Reonal Water Quality Ontrol Board <br /> Central Valley Region s ' <br /> Peter M.Rooney Sacramento Main Office Ed J.Schnabel <br /> Secretaryfor Internet Address: http://www.swrcb.ca.gov/—mgcb5/home.html Chair <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Protection Phone(916)255-3000•FAX(916)255-3015 <br /> 5 August 1998 <br /> Mr. Donald T. Bradshaw <br /> c/o Jae Anderson <br /> Levine Fricke Recon, Inc. <br /> 1900 Powell Street, 12th Floor <br /> Emeryville, CA 94608-1827 <br /> RESULT OFADDITIONAL PLUME PERIMETER CPT INVESTIGATION,LINCOLN CENTER, <br /> SAN JOAQUIN COUNTY <br /> I have reviewed the 4 June 1998 Results ofAdditional CPT Investigation and Proposed Additional <br /> Investigation, Plume Perimeter Investigation, Lincoln Center, Stockton, California submitted by Levine <br /> Fricke Recon for the Settling Dry Cleaning Defendants. This report presents the results of cone <br /> penetration testing and push-in polyvinyl chloride piezometer(CPT/PIPP) testing of the A-, B-, and C- <br /> zone aquifers to delineate the lateral and vertical extent of groundwater contamination at the plume <br /> perimeter. The results of this investigation are that the plume perimeter is not yet defined and additional <br /> investigation is required. Additional CPT/PIPP investigations are proposed for the A- and B-zones at <br /> upgradient locations 12 and 13 and for the A-zone at downgradient locations 14, 15 and 16. If <br /> contamination is not found in these groundwater samples, monitoring wells will be installed to establish <br /> plume perimeter monitoring. The report and proposal for additional CPT/PIPP investigation are <br /> approved provided that the results of the additional investigation be reported to the Board no later than <br /> four weeks following completion of the work. <br /> KIT CUSTIS <br /> Associate Engineering Geologist <br /> cc: San Joaquin County Environmental Health, Stockton <br /> Mr. A.J. Birkbeck, ESQ., Fulcrum Environmental Law, Oak Park, IL <br /> Ms. Anne Farr, Farr Associates, Folsom <br /> Mr. John Gregory, Esq., LeBoeuf, Lamb, Greene & MacRae, San Francisco <br /> Mr. Wilbur Smith 11, Esq., Lincoln Properties, Ltd., Stockton <br /> Mr. Barry Williams, Esq., JAMS/ENDISPUTE, San Francisco <br /> kh c\dl k\u:\20513 o.doc <br /> California Environmental Protection Agency r Recycled Paper <br />