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F_ "tEP 21 ' 96 10 = 34 FROM GETTLER-RYAN INC TO 2773361 PAGE . 004i029 STANDARD OPERATING PROCEDURE - GROUNDWATER SAMPLING Gelder-Ryan Inc. field personnel adhere to the following procedures for the collection and handling of groundwater samples prior to analysis by the analytical Iaboratory. 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 a MMC flexi-dip interface probe. Product thickness, if present, is measured to the nearest 0.01 foot and is noted 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, each well is purged a minimum of three well casing volumes of water using pre-cleaned pumps (stack, suction, Grundfos), or polyvinyl chloride 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 hailer into appropriate containers. Pre-preserved containers, supplied by analytical laboratories, are used 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 40C for transport to the laboratory. Once collected in the field, all samples are maintained under chain of custody until delivered to the laboratory. The chairs 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, beghu-dng With the field personnel and ending with the laboratory personnel. A laboratory supplied trip blank accompanies each sampling set. 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 Tosco Marketing Company, the purge water and decontamination water generated during sampling activities is transported to Tosco - San Francisco Area Refinery, located in Rodeo, California: Wormskouo-wp.ren•1198