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_ •s tt � it SIERRA STANDARD OPERA'T'ING PROCEDURE GROUND WA'T'ER SAMPLING The l0110%011i4 dtscrihes s:unplfttg procedures used by SITS tFrlrl prrsrsrulcl to rullcet alsd llandlc f+rotlnd water sampkc s, l3cf()re samples arc collected.c.lrellil consideration is gil•en to[lie type of i1lla1}'sls to Ile perfornit(I so that preca+stions art. lafcetl to prcvtnt loss of volatile cunlpunulls urconlanrinatloli of the sample,ane]Ul prcticn"c the;;Mlsple lair silbsc(plent ,ttlalysis. 1Vel1s will be sampled nn less hunt 24 hull's alley well dcvel(�psnc itt. C'ol1t�"ttun tuctlulcks spcclflc to ground water sant{Mini arc prestmrd lxiluu. Prior to salupling, earls well is Owcht•cl for the prescncr offrcc-phase hycirocarbons uslog all MMC llexl-dip imerlOce probe, Produc:l thtcicncss (tneaslll'ee! to the ucaresl 0.01 ill is noted on the sampling fol"n. water level lurasurcments arc also mill'usilsg either a Water level meter or the Interface probe. The Water level tncasurements arc also noted on the sampling brut. Prior la sutrlpltng, cacll 'c" IS purged of a]ltinillltnll of fok"-Well casing volifilies Of wafer ush11; a stealn•cicanc(1 PVC bailer. or a pre cic:nled pump. '!'cmperattlrc. {)11 and electrical conductivity are measured at least three limes during purglng. Purging is continued until these re, pH ur conductivity do not exceed±o.5'F, parameters have stabilized ti.e.,changes in temperatu {].1 or 51%, The purge Water is stored temporarily on-site in 55-gallon Department of Transportation- Approved drums pending analytic results. The cinlms are labeled with the date.contents.the SES field personnel Initials and SES phone number. Ground water samples are collected front the wells with steam-cleaner}Teflon bailers. The water samples are decanted Into the appropriate container for the analysis to be performed. Pre- preserved sample containers may be lased 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/or to provide quality control. The samples are labeled to include the project number, sample 1D. date,preservative,and the field person's initials. Tile samples are placed in polyethylene bags and in an ice chest(maintained at 4'C with blue"ice or ice)for transport under chain-of-custody to the laboratory.