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STANDARD OPERATING PROCEDURE - GROUNDWATER SAMPLING Gettler-Ryan Inc field personnel adhere to the following laboratory procedureho sampleson ollecaionnahe type ling of groundwater samples prior to analysis by the analytical rY Prior 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, static water level measurements are collected with the interface probe and are also recorded in the field notes mum of well After water levels are collected and prior to sampling,tack, suctionings G ndfos)�ori polyvinyl hchloride casing volumes of water using pre-cleaned pump 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 Chevron-designated disposable bailers The water samples are transferred from the bailer into appropriate containers Pre-preserved containers, supplied by or alytical laboratories, are used when possible When pre-preserved containers are not available, the 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 mplle are {f any), dd o ithencl sample e the job number,sample identification,collection date and time, analysis,p collector's initials The water samples are placed are maintcooler, ained under chain of custody until delisport vered laboratory Once collected in the field, all samples 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 spersonle colleor's ne. The chain of custody is or surrenders the samples, signed and dated (including time of transfer) by each who receives beginning with the field personnel and ending with the laboratory personnel ling sets ter than A laboratory supplied trip blank accompanies each sampling set far some or all of the same compounds samples,5% trip blanks are included The trip blank is y� 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 McKittrick Waste Management located in McKittrick, California N\CahformaVmw6\L ew0n•SOP 10100