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STANDARD OPERATING PROCEDURE - • <br /> GROUNDWATER SAMPLING <br /> Gettler-Ryan Inc <br /> field personnel adhere to the following procedures for the collection and handling of <br /> groundwater samples pnor to analyses by the analytical-laboratory—Pnor to sample collection,-the type of <br /> analysts to be performed is determined Loss prevention of volatile compounds is controlled and sample <br /> preservation for subsequent analysts is maintained <br /> Prior to sampling, the presence or absence of free-phase hydrocarbons is determined using an interface <br /> probe Product thickness,if present, is measured to the nearest 0 01 foot and is noted 3n the field notes <br /> In addition,all depth to water level measurements are collected with a static water level indicator and are <br /> also recorded in the field notes,prior to purging and sampling any wells <br /> After water levels are collected and prior to sampling, if purging is to occur, each well is purged a <br /> minimum of three well casing volumes of water using pre-cleaned pumps (stack, suction, Grundfos), or <br /> disposable bailers Temperature,pH and electrical conductivity are measured a minimum of three times- <br /> during the purging _Purging continues until these parameters stabilize <br /> Groundwater samples are collected using disposable bailers The water samples are transferred from the <br /> bailer into appropriate containers Pre-preserved containers,supplied by analytical laboratories,are used <br /> when possible When pre-preserved containers are not available,the laboratory is instructed to preserve . <br /> the sample as appropriate Duplicate samples are collected for the laboratory to use to maintaining <br /> quality assurance/quality control standards The samples are labeled to include the job number, sample <br /> identification,collection date and time,analysis,preservation(if any),and the sample collector's initials <br /> Tfie water sartiples-are-placed-in—a-eooler;maintained=at=4oC—for=transport-to-the-laboratory=Once =__ <br /> _collected in the field,all samples.are maintained under chain of custody until delivered to the laboratory <br /> The chain of custody document includes the job number,type of preservation,if any,analysts requested, <br /> sample identification, date and time collected, and the sample collector's name The chain of custody is <br /> —signed—and—dated—(including—time—offtransfer) by each person who receives or surrenders the samples, <br /> beginning with the field personnel and ending with the laboratory personnel <br /> A laboratory supplied trip blank accompanies each sampling set For sampling sets greater than 20 <br /> samples, 5%trip blanks are included The trip blank is analyzed for some or all of the same compounds <br /> as the groundwater samples <br /> As requested by Chevron Products Company, the purge water and decontamination water generated <br /> during sampling activities is transported by IWM to McKtttnck Waste Management located to <br /> McKIttr]ck California <br /> N,\Cahfomta\fortrtkhevron-soP 02-03-03 <br />