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r' ..fir , � ',. "4 N - � •'' r� � r�_ - "x - � � , `f�.r + �tx•�, 2Y-.- i a1, iso-�". ��3 .�• i§� � e�"� ;ri�7��'�.k- t• .gyp � •c � f �k '•�' �L SIF,HRA STANDARD OPERATING PROCEDURE • GROUND WATER SAMPLING I'iu I"ullouinl; dcsrribes tiattiphn.g procvdurer, wwd by S1;S fu-Id perr:arsncl to cnllrct, hartdic,and doc•rtrtu•lit f rnussd wata r s tmisles. ]!chore santpirs arc collreted,carrfasl cwo,A rrauoll Is gn•en to the lype of arsalvsl:, to use prrforntrd so that precaution,- arc t:alcett 10 prrcctst i0Y, ul volatile,coltalxrnrrtts or cotllaittfnation of thv saniplr, and to Arcs.stir thr-,ample•for s1111,w llrn! anah;sis. ColiveHotl rttrthocls sprclrlc to ground w.stcr s:tnuplttlg arc presented below. All wells arc s:unpk•d With cilher dedicated %inipling bailers or lsurrtp�, or uon•drdu•att•d equipment that is strain cleaned betwec n nelis. Ef Ihrra are hiraortcal analytic n sults,far glouncl water availimle for a site. water levels and water sailll des "'ill he cullectcd its Ihi ncils in ordt from div lootsl to higl,cst concentrations of hydros arburts. Prior to sampling;. each well is purged of a mininnarn of Ihrec wellcasing volutuc:.cal n•.t1ct for ti=e mutllrnnn r equfred by local retulotious)or until pl 1.elect ricaI condatct iVilV and 1 rntperut ury stabili;se in tile ground walrr removed from the well, 11 the well is purged dry during, removal (if' the water,the nater sample is collected When the nater lcvc•1 has recovered to 80,%, of the original static level. The purge water is stored on-site pending analytic results all is then t::ken In a Chevron-approved disposal liacllity. Nater samples are collected in steam cleaned teflon bailers or with dedicatee] bladder pumps. The water samples are decanted into 40 milliliter Mass volatile-organic-analysis(VO's) vials with teflon septa. The samples etre fillet(to the top.the cap is placed lightly on the VOA and the VOA is checked for trapped air bubbles. IICI,may be used as preservative in s.he satnples. A duplicate sample is collected from each well as a back-up sample and/or to provide quality control. This sample is held at the laboratory. The samples are then labeled, refrigerated and transported under chain-of-custody to the laboratory. Sample labels include the project number. sample number,date•and sampler's initials. The chain-of-custody includes the project number. the sample number, the date and cite sampler's name. A trip blank accompanies a sample set or 5%trip blanks are Included for sets of greater than 20 samples. A bailer blank is prepared for a site or 511,6 bailer blanks are prepared for sets of greater than 20 samples. The butler blank is prepared by pouring cleionizIA water Into a steam-cleaned bailer before it IS used to sample the well. The trip and bailer blanks are analyzed for some or all of the same compounds as the ground water samples.