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CONFIRMATORY O, / WATER SAMPLES <br />The type and number of samples to be collected will depend on whether or not water is <br />! present in the excavation, and whether obviously contaminated areas are detected in <br />locations other than those proposed. <br />! If water is not present in the tank excavation, only soil samples will be collected. Samples <br />will be collected from beneath the base of the excavation a maximum of 3 feet into the <br />underlying soil. Two soil samples will be collected, one at each end of each tank as it was <br />! formerly positioned in the excavation. One soil sample will also be collected beneath every <br />20 feet of UST related pipes removed. <br />If water is present in the tank excavation, both soil and water samples will be collected as <br />• described previously, except that they will be collected from the excavation wall at the <br />soil/groundwater interface at each end of the tank. A single water sample will be collected <br />from the excavation. Before sampling, the presence of floating product will be determined. <br />The excavation will be carefully purged of all standing water by pumping and allowed to <br />refill before sample collection. All purged water will be stored separately onsite pending <br />the receipt of analytical results which will indicate final disposition: either transport and <br />! disposal as a hazardous waste, or disposal into the storm drain system. If the purge water is <br />determined to be a hazardous waste, it will be transported by a State of California licensed <br />hazardous waste hauler (AEMC) under hazardous waste manifest to a TSD facility for <br />! disposal. <br />Soil samples will be collected in 3- to 6 -inch long brass liners using a drive -tube type <br />sampler which will be driven into the ground using a rubber mallet. The sampler will be <br />sufficiently driven into the soil profile so as to allow no headspace in the brass liner. <br />h1pbe-12(do4) <br />El <br />