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+7 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 analysts 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 s determined 0 O1 foot g a �s flexi-dip interface probe. Product thickness, if present, is meas urednoted in the field notes In addition, static water level measurements are collected with the interface probe and are also recorded in the field notes After water levels are collected and prior to sampling, eacs well is sGurged a n po m Of three de ell casing volumes of water using pre-cleaned pumps (stack, bailers Temperature, pH and electrical conductivity are measured 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 rs areinotsava lablleathe laboratory by ical ltsbonstructed are used when possible When pre-preserved con 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 include �� le number, sample identification, collection date and time, analysis, preservation (if any), P collector's initials The water samples are placed in a cooler, maintained at 4oC for transport to e 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 fob 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 c�e laboratory personnel.erson who receives or surrenders the samples, beginning with the field personnel and ending ` ith A laboratory supplied trip blank accompanies each sampling analyzed ed sampor ling ors greater ll of Hite an 2sam0 samples, 5% trip blanks are included. The trip blank,is y compounds as the groundwater samples As requested by Unocal Corporation, the purge water and decontamination water generated during sampling activities is transported to Tosco - San Francisco Area Refinery, located in Rodeo, California. h%fanw%uaoca"fro-1198