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STANDARD OPERATING PROCEDURE - GROUNDWATER SAMPLING Gettler-Ryan Inc field personnel adliere to the following procedures for the collection and handling o f groundwater samples prior to analysis by the analytical laboratory Prior to sample collection,the type o 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*olumes 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 transferrd are u ed ,,Gom the roundwater into appropriate containers Pre-preserved containers,supplied by analytical laboratories, when possible When pre-preserved containers are not;available,the laboratory is instructed to preserve 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 job 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, maintained at 4°C for transport to the laboratory Once collected in the field,all samples are maintained under chain of custody until delivered to the laboratory The chain of custody document includes the Job 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 A laboratory supplied tnp blank accompanies each sampling set and is labeled as QA For sampling sets greater than 20 samples, 5% trip blanks are included The trip blank is analyzed for some or all of the same compounds as the groundwater samples As requested by ConocoPhillips Company,the purge water and decontamination water generated during sampling activities is transported to ConocoPhilhps - San Francisco Refinery, located in Rodeo, California 0 h41muk0r'0c0ph11hps-m2rkeLsop fim-07103