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LBoyett Petroleum May 18, 2000 <br /> 419 Soutlz Main Street, Manteca, California Page 7 <br /> Work Plan for Lateral Extent <br /> Lof Grountlwater Contamination (Addendum) <br /> and electrical conductivity of the water will be noted on a field log. Instruments calibrated <br /> to known standards will be used to monitor these parameters. <br /> At least five (5) well volumes will be evacuated from each well, and more, if necessary, until <br /> the above parameters have stabilized. Wells that are de-watered before evacuation of five <br /> (5) well volumes has been accomplished will be sampled upon eighty percent of recovery of <br /> the initial water level. The wells or other sampling points will be sampled in order of the <br /> L least to most contaminated, as best known or estimated. The samples will be pumped from <br /> a stainless steel bladder pump or carefully poured from a Teflon® bailer into clean glass <br /> L vials with Teflon® lined screw caps and half-gallon plastic containers provided by the <br /> laboratory. Care will be taken to ensure that no air space exists in the vials by inverting to <br /> check for bubbles and re-sampling if necessary. <br /> LAll water samples will be analyzed or extracted within fourteen days according to their EPA <br /> methods. The samples will be analyzed using EPA method 5030/LUFT for gasoline <br /> Lpetroleum hydrocarbons, EPA method 8020 for BTX&E compounds, and EPA Method <br /> 8260 for oxygenates. <br /> L <br /> 6. <br /> L <br /> L <br /> L <br /> L <br /> L <br /> 6. <br /> L <br /> L <br />