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7/ ff SES STANDARD OPERATING PROCEDURE GROUND WATER SAMPLING lire Ioll(ly illo (1( "c i i})c , ,,iuiplinL1hitic C ii5c(I hvsf:Miced 1), i I 1- wi grouncl X�ater ,3111plcs lir lore Samples err r c ollu ted c arelLll cOnsiduatuin 11 L() the t}pe of <iu il� moi, to be perfoimed so that precautions uric Lakcii to prevent loss of volatile (oniponcnts of eontasmrl,)tIol of the sample and w preserve the -'ample for subsequciit analysis Wells \Ill lac Sampled no less 01,111 24 hours after well dcvclopincnt Collection methods specific to ground wdtf i ,amplinq ii(_ pi esc nic cl below Prior to sampling each well is checked for the presence of free-phase hydrocarbons using an MMC flexr-dip interface probe Pi oduct thickness (measured to the neai est 0 01 foot) is nolo d on the sampling form Watei level mcasui crnents ale also made using either a watei lc.el mcb-i oc she uZtei fac t probe The water level measui ements are also noted on the sampling form Prior to sampling each well is purged of a minimum of four well casing volumes of water using a steam-cleaned PVC bailee or a pre-cleaned pump Temperature pH and electrical conductivity ai e measured at ]cast three times during purging Purging is continued until thc,sc parameters ha\ c stabilized (i e , changes in temperature pH or conductivity do not exceed ±0 5 F O 1 of 5% r espectively) The purge water is taken to Chevron s Richiriond Refinery for disposal Ground water samples ai c collected from the wells with steam-cleaned Teflon bailers The water samples are decanted into the appropriate container foi the analysis to be performed Pic- preserved sample containers may be used or the analytic laboratory may add preservative to the sample. upon arrival Duplicate samples are collected from each well as a back-up sample and/ol to provide quality control The samples are labeled to include the project number sample ID date preservative, and the field person s initials "1'hc samples are placed in polyethylene bags and in an ice c hear (maintained at 4 C with blue ice or ice) for transport under chain of custody to the laboratory The chain of custody foim includes the project number analysis requested, sample ID, date analysis and the SES field person s name The form is signed and dated (with the transfer time) by each person who yields or receives the samples beginning with the field personnel and ceding «nth Llie laboratory personnel A tnp blank and bailer blank accompanies each sampling set or 5% trip blanks and 5% bailLi blanks are included for sets of greater than 20 samples The bailer blank is prepai ed by pouf i i ig previously boiled water into a steam-cleaned Teflon bailer prior to sampling a well The trip and b iilei blanks are analyred for some of all of the same compounds as the ground water Samples GWS-CHEZ SOP