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II { <br /> 1 <br /> GROUNDWATER SAMPLING PROTOCOL <br /> All purging and sampling equipment will be completely disassembled and <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, <br /> and p4 will be measured with a portable electronic meter and rioted. The meter will a <br /> be calibrated prior to the. sampling event. Purging will continue .until the key <br /> ;� 4 <br /> parameters stabilize. Approximately three to four well casing volumes of <br /> groundwater will be removed (approximately 5 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. <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 I <br /> transported according to the .Environmental Protection . Agency (EPA) protocol.,.,N_._ <br /> Sample'F 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 /> I� <br /> i <br /> �I <br /> jl <br /> IS�I <br /> it <br /> } ly <br />