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STANDARD OPERATING PROCEDURE- GROUNDWATER SAMPLING Gettler-Ryan Inc field personnel adhere to the following procedures for the collection and handling of groundwater samples prior to analysis by the analytical laboratory. Prior to sample collection,the type of analysis to be performed is determined Loss prevention of volatile compounds is controlled and sample preservation for subsequent analysis is maintained. Prior to sampling,the presence or absence of free-phase hydrocarbons is determined using an interface probe Product thickness,if present,is measured to the nearest 0.01 foot and is noted in the field notes.In addition, all depth to water level measurements are collected with a static water level indicator and are also recorded in the field notes,prior to purging and sampling any wells After water levels are collected and prior to sampling, temperature,pH and electrical conductivity are measured if purging is to occur,each well is purged a minimum of three well casing volumes of water using pre-cleaned pumps(stack,suction,Grundfos),or disposable bailers The measurements are taken a minimum of three times during the purging Purging continues until these parameters stabilize Groundwater samples are collected using disposable bailers The water samples are transferred from the bailer into appropriate containers Pre-preserved are notavailable, driplied by the laboratory i analytical instrted to preserve the tories,are used when possible When pre-preserved containers the sample as appropriate Duplicate samples are collected for the laboratory to use in maintaining quality assurance/quality control standards The samples are labeled to include the fob number,sample identification,collection date and time,analysis,preservation (if any),and the sample collector's initials The water samples are placed in a cooler, ed under chain of cuat 4oC stody until delivered tor transport to the oratory the laboratnce ory. collected in the field,all samples are maintain The chain of custody document includes thejob number,type of preservation,if any,analysis requested, sample identification, date and time collected, and the sample collector's name The chain of custody is signed and dated (including time of transfer) by each person who receives or surrenders the samples, beginning with the field personnel and ending with the laboratory personnel led as QA A laboratory supplied trip blank accompanieseach sampling strip blank is�analyzed for some oral] of Hite greater than 20 samples, 5%trip blanks are included same compounds as the groundwater samples As requested by Phillips 66 Company, the purge water and decontamination water generated dunng sampling activities is transported to Phillips 66 - San Francisco Refinery,located in Rodeo,California nvor,ns�pMiips-iossnarta.so�trm►ir1 f 102