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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 deternuned 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 duckness, 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 numinum of three times during the purging. Purging continues until these parameters stabilize. 0 Groundwater samples are collected using Chevron -designated disposable bailers. The water samples are transferred from the bailer into appropriate containers. Pre -preserved containers, supplied by analytical • laboratories, are used for all samples. 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 4oC for transport to the ., laboratory. Once collected in the field, all samples are maintained under chain of custody until delivered L to the laboratory. The chain of custody document includes the job number, type of pieservvation, if any, analysis requested, sample identification, date and time collected, and the sample collectofs 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 trip blank accompanies each sampling set or sampling sets greater than 20 samples, 5% trip blanks am included. The trip blank is analyzed for some or all of the same compounds as the groundwater samples. As requested by Chevron Products Company, the purge water and decontamination water generated during sampling activities is transported by IWM to McKittnck Waste Management located in McKittrick, California. i N;4Cal&n=Voffr* *evroo-SOP IQW