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Morita Bmthers Service Station 16 July 16, 1992 <br /> 6�Z�:V <br /> measured with a portable electronic meter and recorded The meter will be calibrated <br /> prior to the sampling event The purging will continue until the monitored <br /> parameters stabilize (usually after three to four casing volumes of groundwater have <br /> been removed) The groundwater monitoring well will be sampled after water in the <br /> wells has recharged to approximately 80% of the original ground water elevation If, <br /> ' during purging, the monitoring well is purged dry, purging will be stopped for five <br /> minutes to allow the well to recharge If the well does not recharge at a sufficient <br /> ' rate to continue purging the three to four casing volumes, the well will be allowed to <br /> recharge and will be sampled <br /> Following purging, a groundwater sample will be collected with pre-cleaned TeflonTM <br /> bailer, and discharged with a non-aerating bottom emptying device into sterilized <br /> glass containers, capped with TeflonTm septa, labeled, and chilled in an tee chest for <br /> transport The water sample will be handled and transported according to the United <br /> States Environmental Protection Agency (USEPA) protocol to the DHS certified <br /> laboratory requested Sample identification and chain of custody procedures will be <br /> utilized to ensure sample integrity and to document sample possession from the time <br /> of collection to its ultimate disposal The sample labels will identify the fob number, <br /> sampler, date, time of collection, and sample number unique to the sample The <br /> ' proposed monitoring wells will be surveyed relative to a permanent structure, and <br /> from a designated point on the north side of the top of the well casing, the <br /> groundwater level will be measured in the well to an accuracy of 001 feet <br /> ' Chemical Analysis of Soil and Groundwater Samples <br /> Soil samples will be sent to a State of California certified laboratory Based on field <br /> ' observations, two soil samples from the boring will be selected for laboratory <br /> analysis Soil samples will be analyzed for total petroleum hydrocarbons (TPH) as <br /> gasoline, and the gasoline constituent volatile aromatics benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) by the California DHS LUFT Method, and USEPA <br /> Method 8020, respectively The groundwater sample will be analyzed for TPH as <br /> ' gasoline, and BTEX by the USEPA Method 502 1, respectively <br /> ' EB-8101-3 9207-EO37 WP <br />