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STA.NDARD 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 determined. Loss prevention of volatile compounds is controlled and sample preservation for subsequent analysis is maintained. Prior io 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, if purging is to occur, each well is purged a minimum of three well casing volumes of water using pre-cleaned pumps(stack, suction,Grundfos),or disposable bailers. Temperature,pB and electrical conductivity are measured a minimum of three times during the purging. Purging continues until these parameters stabilize. samples are collected using disposable bailers. The water samples are transferred from the ,Groundwater bailer 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 to.use in The sample as appropriate. Duplicate samples are c les are labeledthe toairnclude the job numbernsample taining quality assurance/quality control standards. The same 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 chain of custody document includes the job number,type of preseryation,if any,analysis requested, sample identification, date and time collected, and the sample collecior'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 tip 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 Chevron Products Company, the purge water and decontamination water generated during sampling activities is transported by IWM to- McKittrick Waste Management located in McKiltrick. Califomia. N;Califomialfan�lchevrvrrSOP.0200-03