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STANDARD OPERATING PROCEDURE - <br /> GROUNDWATER SAMPLING <br /> Gettler-Ryan Inc. field personnel adhere to the following procedures for the collection and <br /> handling of groundwater samples prior to analysts by the analytical laboratory. Prior to <br /> sample collection, the type of analysts to be performed is determined. Loss prevention of <br /> volatile compounds is controlled and sample preservation for subsequent analysts is <br /> maintained. <br /> Prior to sampling, the presence or absence of free-phase hydrocarbons is determined using <br /> a MMC flexr-dip interface probe Product <br /> nt addttton,fpresent, is measured to stat c water levelmeasurehmentsrest <br /> a e <br /> o.o1 foot and is noted to the field notes <br /> collected with the interface probe and are also recorded to the field notes <br /> After water levels are collected and prior to sampling, each well is purged a minimum of three <br /> well casing volumes of water using pre-cleaned pumps (stack, suction, Grundfos), or polyvinyl <br /> chloride bailers Temperature, pH and electrical conductivity are measured a minimum of <br /> three times during the purging. Purging continues until these parameters stabilize. <br /> Groundwater samples are collected using Chevron-designated disposable bailers The water <br /> samples are transferred from the bailer into apprtipnate containers Pre-preserved containers, <br /> supplied by analytical laboratories, asetruistru when�preserve the samplepre-preserved <br /> as appropriate are not available, the laboratory <br /> Duplicate samples are collected for the laboratory to use in maintaining quality <br /> assurance/quality control standards The samples are labeled to include the job number, <br /> sample identification, collection date and time, analysts, preservation (if any), and the sample <br /> collector's initials The water samples are placed in a cooler, maintained at 4oC for transport <br /> to the laboratory Once collected in the field, all samples are maintained under chain of <br /> custody until delivered to the laboratory. <br /> The chain of custody document includes the job number, type of preservation, if any, analysis <br /> requested, sample identification, date and time collected, and the sample collector's name. <br /> The chain of custody is signed and dated (including <br /> lnclw thgh field personnelby each person who <br /> and end ng with the <br /> receives or surrenders the samples, beginning <br /> laboratory personnel. <br /> A laboratory supplied trip blank accompanies each sampling set. For sampling sets greater <br /> than 20 samples, 5% trip blanks are included. The tnp blank is analyzed for some or all of <br /> the same compounds as the groundwater samples. <br /> As requested by Chevron Products Company, the purge water and decontamination water <br />. generated during sampling activities is transported by IWM to McKittnck Waste Management <br /> located in McKittrick, California. <br /> acv�z� <br />