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i <br /> GROUNDWATER SAMPLING PROTOCOL <br /> i <br /> i <br /> All purging and sampling equipment will be completely disassembled and j <br /> r <br /> washed with a non-phosphate detergent solution, rinsed with clean tap water and <br /> deionized water, then allowed to air dry before purging and': sampling each well to <br /> reduce the possibility of cross-contamination. Prior to sampling, the groundwater <br /> monitoring wells will be purged with a pre-cleaned bailer to remove stagnant water <br /> in the wells. During, purging, key, ,parameters .including temperature, conductivity,..._...., 40 <br /> and pH will be measured with a portable electronic meter and' noted. The meter will <br /> be calibrated prior to the sampling event. Purging will continue until the key <br /> parameters stabilize. Approximately three to four well casing volumes of <br /> groundwater will be removed (approximately 6 to. 12 gallons). The groundwater <br /> monitoring wells will be sampled after - water in the 'wells has recharged. to <br /> approximately 80% of the original groundwater elevation. If during purging, the <br /> monitoring well is purged dry, purging will be stopped for approximately 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 purged � <br /> dry 'two times and allowed to recharge until sampling. E <br /> Following purging, groundwater samples will be collected with pre-cleaned <br /> TeflonTM bailers, and discharged with a- non-aerating bottom emptying device into <br /> sterilized glass containers,' capped with TeflonTm septa, labeled, and chilled in an ice <br /> chest, for transport to a State of California Department of Health Services (DOHS) <br /> laboratory certified for the analyses requested. Water samples will be handled and <br /> transported according to the Environmental-Protection - Agency -(EPA) protocol. <br /> Sample identification and chain of custody procedures will be utilized for the samples <br /> to ensure sample integrity and to document sample possession from the time of <br /> Collection, to its ultimate disposal. The sample labels identify the job number, <br /> sampler, date and time of collection and sample number unique to the sample. <br /> 3' <br /> y <br /> L i <br /> i 3 <br />