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SC&D Boyett Petroleum <br /> 419 South Main Street March 18, 1999 <br /> Manteca, California Page: 5 <br /> s <br /> will be removed from its liner to be used as an aide to the on-site professional in <br /> logging the material at that depth. <br /> Soil samples collected for analysis will be analyzed using EPA Method 8015 <br /> modified for total petroleum hydrocarbons in the gasoline range, EPA Method <br /> 8020 for BTX&E compounds and EPA Method 8260 for oxygenates. The <br /> minimum detection limits used for each analyte will be .005 mg/kg for BTX&E, <br /> and 2.5 mg/kg for gasoline. Analyses are to be conducted by California <br /> Laboratory Services, Inc., a State-certified laboratory in Rancho Cordova, <br /> California. <br /> 3.5 Groundwater Sampling <br /> A travel blank provided by the laboratory will accompany the sample vials from <br /> the time they are picked up from the lab to the time they are delivered to the <br /> lab. This travel blank should be listed on the Chain of Custody but will be <br /> analyzed only if all samples contain the same contaminants. <br /> All sampling equipment including the pump, bailer, and cables, used by <br /> lie sampling personnel, will be disassembled, if appropriate, and steam-cleaned <br /> prior to commencement of sampling. These procedures will also be followed <br /> between each well, sampling point, and at the end of the sampling day. De- <br /> ionized or organic-free water (also provided by the laboratory) will then be <br /> introduced into the pump or bailer as a final stage of cleaning. This water will <br /> then be pumped or gently poured into sample vials to be used as pump or bailer <br /> blanks. These blanks will be tested only if their corresponding samples are <br /> found to contain contaminants. <br /> ' ImmediatelY Prior to sampling, water levels and well depth measurements� will <br /> be taken in all wells at the site. Each well will be evacuated using a stainless <br /> steel bladder pump, which does not introduce air into the water column, or a <br /> Teflon bailer. The pH, temperature, and electrical conductivity of the water <br /> will be monitored as the well is evacuated. These parameters will be noted on a <br /> field log. Instruments calibrated to known standards will be used to monitor <br /> these parameters. <br /> At least 5 well volumes will be evacuated from each well, and more, if <br /> _ necessary, until the above parameters have stabilized. Wells that are de-watered <br /> ' before evacuation of 5 well volumes has been accomplished will be sampled <br /> upon 80 percent recovery of the initial water level. The wells or other sampling <br /> points will be sampled in order of the least to the most contaminated, as best <br />