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STANDARD OPERATING PROCEDURE - <br /> GROUNDWATER SAMPLING ' <br /> Gettler-Ryan Inc field peisonnel adhere to the following procedures for the collection and handling of <br /> groundv,ater saniplcs prior to analysts by the analytical Iaboratoi3 Prior to sample collection,the type of ' <br /> analysis to be pei foimed is deteririined Loss prevention of v olatile compounds is controlled and sample <br /> piesei�,ation for subsequent analysis is maintained <br /> Prior to sampling the piesence or absence of free-phase hydrocarbons is detennined using an interface <br /> probe Product thickness, if piesent, is rneasuied to the nearest 0 01 foot and is noted in the field notes <br /> In addition all depth to watci le,.el measurements are collected with a static water level indicator and are <br /> also recorded in the field notes prior to purging and sampling any wells <br /> After eater levels aie collected and prior to sampling,, if purging is to occur, each well is purged a <br /> minimum of three yell casing volumes of N\atei using pre-cleaned pumps(stack, suction Grundfos),or <br /> disposable bailei s Temperature,plt and elccti real conductivit} are measured a rninimurn of three times <br /> during the purging Purging continues until these parameters stabilize I <br /> Groundwater samples aie collected using disposable bailers The water samples are tiansferred from the <br /> bailer into appropriate containeis Pre-preser-,ed containers,supplied by analytical laboratories are used ' <br /> \.when possible NVIien pre-presen ed containei ,are not a-\ailable,the laboratory is instructed to preserve . <br /> the sample as appropriate Duplicate samples are collected for the laboratory to use in maintaining <br /> quality &,suiance/quality control standards The Samples are labeled to include the job number sample <br /> identification collection date and time analysis pieservation(if any) and the sample collector's initials ' <br /> The vatei samples are placed in a cooler maintained at 4°C for tiansport to the laboratory Once <br /> collected in the field all samples aie maintained under chain of custody until delivered to the laboratory ' <br /> The chain of custodx document includes the fob number,tvpe of pi eser-,ation if any,analysis requested, <br /> sample identification date and time collected and the sample collector's name The chain ofcustody is <br /> signed and dated (includim, time of transfer) by each peison vvlio recei,,es or surrenders the samples <br /> beginning %%ith the field personnel and ending vtiith the laboratory personnel <br /> A laboiatoiv supplied flip blank a"ompames each sampling set For sampling sets greater than 20 <br /> sainples 5%trip hlanks are included The trip blank is analyzed for Sonic or all of the same compounds <br /> as the groundwater samples <br /> As requested by Che\lora f_riyironniental A/lanagenient Company, the purge water and ' <br /> l � � <br /> decontamination t\atei genciated dui ing sampling actin ities is transported by IWM to Chemical <br /> Waste Management located in Kettleman Hill California <br /> 1 <br /> h'Cihionim foniis chevron-SOY]Ah 2006 <br /> 1 <br />