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STANDARD OPERATING PROCEDURE - GROUNDWATER SAMPLING procedures for the collection and handling of Gettler-Ryan Inc.field personnel adhere to the following groundwater samples prior to analysis by the analytical laboratory. Prior to d pSe octi is trolled type of and sample analysis to be performed is determined. Loss prevention ofvolatale comp preservation for subsequent analysis is maintained. Prior to sampling,the presence or absence of free-phase hydrocarbons is determined in the field notes. probe. Product thickness,if present,is measured an interface �°th n nearest wig stoattic water level indicator and are In addition,all depth to water level measur also recorded in the field notes,prior to purging and sampling any wells. After water levels are collected and prior to sampling, if pufging is to occur, each well is purged a minimum of three well casing volumes of water using pre-cleaned pumps(stack, disposable bailers. Temperature,pH and electrical conductivity are measured a minimum of three times during the purging. Purging continues until these parameters stabilize. roundwater samples are collected using disposable bailers. The water samples are ones,are utransferred frolm sed P �`ailer into appropriate containers. Pre-presen►ed containers,supplied by able,the story is when possible. When pre-preserved containers are not ava1ed for he aborti orysto use inmaintaining the sample as appropriate. Duplicate samples are collet quality assurance/duality control standards. The samples are labeled t in lu sample collector's ur,ma tial e identification,collection date and time;analysis,preservation C any), e laboratory. Once The water samples are placed in a cooler, maintained chain of custodfor y until delisP6Tt tov ered rered o the laboratory. collected in the field,all samples are maintained and The chain of custodydocument includes the job number,type of Preservation,if any,analysis requested, eof s name. The chain of custody is sample identification, date.and time collected;and the sample;olio receive or surrenders the samples, signed and dated (including time of transfer) by each person h beginning with the field personnel and ending with the laboratory personnel. 20 A laboratory supplied trip blank accompanies each sampling set. For ompr allingthe samsets e to pounds samples, 5%trip blanks are included. The trip blank is analyzed for so me as the groundwater samples. As requested b Chevron Products Company, the purge „nater and decontamination water generated q y during sampling activities is transported by I1NM to McKittrick Waste Management located m McKittrick. California. N. -03