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be purged using a precleaned 4 inch PVC bailer by removing 4 to 5 <br /> i volumes of water from the casing. <br /> Ground water samples will be collected using the aforementioned <br /> Teflon bailers . Ground water samples will be analysed using a <br /> modified EPA 624 methodology . All soil and ground water samples <br /> will be placedon ice and shipped under chain of custody to the <br /> laboratory within 24 hours . <br /> Each soil boring will be logged by a supervising geologist and <br /> described according to the Unified Soil Classification System. <br /> In addition to the above described field activcities sufficient <br /> information on regional geology and hydrology will be collected <br /> to allow collection of all data into a problem assessment report. <br /> The problem assessment report will be developed according to the <br /> Central Valley Regional Water Quality Control Board' s Guidelines. <br /> 5 <br />