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C-:All 1, <br /> i`.' <br /> Tonal Water Quality Control Board <br /> California Reg -� <br /> Central Valley Region Ed I Schnabel <br /> Peter M.Rooney <br /> Chair <br /> Secretaryfor Sacramento Main Office _! _.1 - <br /> Environmental Intemet Address: http://w�.swmb.ca.gov/-mqcl�lb.;e.h.;I: Cc <br /> Protection 3443 Routier Road,Suite A,Sacramento,Califomia 95927-3003 <br /> Phone(916)255-3o00•FAX(916)255-3015 <br /> 6 July 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 /> ESTIGA TION RESUL IS AND PROPOSED A <br /> IPL UME PERIMETER NVESTIGATION WORK•LINCOLN CENTER, SAN JOAQUIN COUNTDDITIONAL <br /> I have reviewed the 4 June 1998 Results of Additional CPT Investigation and Proposed <br /> Additional Investigation, Plume Perimeter Investigation,, Lincoln Defendants. ton, Californiarepo <br /> submitted by Levine Fricke Recon for the Settling Dry <br /> presents the results of CPT/PIPP borings and groundwater samples taken in the A-, B-, and <br /> C-zone aquifers. <br /> In March 1998, two CPT borings were advanced west of Lincoln Center and t`� Disc etc PIPP <br /> the east to depths that ranged from 142 ced to <br /> to 178 feet below ground surface (bis). <br /> groundwater samples were taken from selected zones in these boring. Results of this <br /> investigation show that the hazardous substances plume boundary has not been defined to <br /> tional <br /> 0.5 µg/1. The report also makes upgr adient bo�ringsalocations 1endtions for 2and 13,nwilltigations to avance fiv <br /> be advancedto a depthe <br /> CPT/PIPP borings. Two upg <br /> of approximately 140 feet bgs, and three downgradient borings, locations 14, 15, and 16,will <br /> be advanced to a depth of approximately 90 feet bgs. PIPP groundwater samples will be <br /> analyzed for volatile organic compounds using EPA Method 8260A. I approve this additional <br /> plume perimeter investigation work. <br /> of Please submit thepreliminary <br /> rel myou may results <br /> me at me at 255-3077.itional work in the bi-monthly status reports. <br /> If you have any questions, <br /> KIT CUSTIS <br /> Associate Engineering Geologist <br /> cc: (see attached list) <br /> California Environmental Protection Agency <br /> ¢r}Recycled Paper <br />