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r .r . .. <br /> s <br /> Boyett Petroleum April 19, 2000 <br /> t419 South Main Street, Manteca, California Page 6 <br /> Work Plan for Lateral Extent <br /> of Groundwater Contamination <br /> ' should be listed on the Chain of Custody but will be analyzed only if all samples contain the <br /> same contaminants. <br /> All water sampling equipment will be thoroughly steam cleaned before and between <br /> sampling to prevent cross contamination. Water samples will be collected from the <br /> termination point at each boring. There will be a total of eight water samples, two from <br /> each boring. <br /> Y <br /> Immediately prior to sampling, water levels and well depth measurements will be taken in all <br /> wells at the site. Each well will be evacuated using a stainless steel bladder pump, which <br /> does not introduce air into the water column, or a Teflon@ bailer. The pH, temperature, <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 /> 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 /> vials with TeflonO 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 />' All 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 />' petroleum hydrocarbons, EPA method 8020 for BTX&E compounds, and EPA Method <br /> 8260 for oxygenates. The detection limit for Benzene, Toluene, and Ethyl Benzene is 0.03 <br /> ug/L. Total Xylenes have a detection limit of 0.06 ug/L. Gasoline has a detection limit of <br />' 0.05 mg/L. <br /> 1 <br /> 1 <br /> 1 <br />