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CRLIFORNIR <br />3443 1 Road L 1 Phone: • • 361-5600 <br />Sacramento, California 95827-3098 ATSS: 8-495-5600 <br />TO: !1Jon B. Marshack, D.Env. <br />Senior R Engineer Environmental••i: <br />Waste Discharge Land Unit Ground Water Protection <br />InvestigationsSection <br />40 <br />DATE: 10 September 1987 SIGNATURE: <br />SUBJECT: KLEINFELDER PROPOSAL FOR CONFIRMATORY PCB SAMPLING <br />D; ANALYSIS AT COVE S' SITE, STOCKTON <br />The following are my f on • 'ct work plan, dated 28 <br />August <br />The work plan • EPA test the second <br />• •` of 846The third editionof r dated November, <br />1986, has superseded the referenced edition and should be used for <br />guidance on future samQling and analytical work performed for this <br />The work plan claims that earlier analytical data, which indicates <br />that PCBs • i present er waste inexcess ofthe DHS <br />hazardous and Federal limit of 1. are •conclusive. <br />The analytical method used on these samples was Method 8080, gas <br />chromatography with an electron capture * or halogen -specific <br />detector. This method uses- the retention time in the <br />chromatographic column and the relative abundance of individual <br />PCB* species to identify and quantify the PCBs present in a sample. <br />Standards are • for r • • <br />Much of this error may be eliminated by using a gas <br />chromatography/mass spectrometry (GC/MS) method, such as Method <br />8270. This method may be used to confirm the presence of and to <br />better quantify the PCBs in a sample, as suggested in the work plan. <br />Detection limits will be higher with this method, however. <br />• The presence of phthalate esters can cause major interference with <br />sample analysis if an electron capture detector is used. According to <br />S-846, this interference may be completely eliminated by <br />substitution of a microcoulometric or electrolytic conductivity <br />