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i r <br /> ` . ERI 205503.W01 Unocal Service Station 5886,Stockton, California March 28, 1997 <br /> �d evaluate groundwater flow direction and the extent of MTBE impacted groundwater beneath the site. <br /> The groundwater flow direction is based on the previous monitoring and sampling events by others. <br /> Laboratory Analyses <br /> The soil samples analyzed will include the sample producing the highest reading on the <br /> photoionization detector (PID) and the sample collected from directly above groundwater in each <br /> boring. Selected soil samples and groundwater samples will be analyzed for MTBE using EPA <br /> Method 8020. Detection limits for the tests requested and concentrations present will be stated on <br /> the laboratory reports. Analytical methods and detection limits will conform to Regional Water <br /> Quality Control Board guidelines. Laboratory analyses will be performed by a laboratory certified by <br /> the State of California. <br /> Report Preparation <br /> f ERI will prepare a report summarizing the system integrity evaluation and testing, soil stratigraphy <br /> (�J encountered in the borings; field and laboratory results, geology, hydrogeology, MTBE distribution, <br /> and conclusions which will be provided to 76 Products Company. <br /> SCHEDULE OF OPERATIONS <br /> ERI is prepared to implement the work plan within 2 weeks upon regulatory approval and obtaining <br /> appropriate permits. 76 Products Company and appropriate regulatory agencies will be notified <br /> should any delays occur. <br /> PROJECT STAFF <br /> Mr. Steve M. Zigan, a Registered Geologist (R.G. 4333) and Hydrogeologist (H.G. 133) in the State <br /> of California, will be in charge of this project. Mr. Keith A. Romstad, Branch Manager, will <br /> manage field and office operations. ERI employs a staff of geologists, engineers, and technicians <br /> who will help complete the project. <br /> 4 <br />