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1 <br />1 ~~~ <br />1 <br />' June 30, 1997 <br />CORE LABORATORIES <br />SAMPLE DELIVERY GROUP NARRATIVE <br />' Customer: Greystone <br />Project: COSTII,LA CO LANDFILL <br />Core Laboratories Project Number: 971377 <br />Method 624 GC/MS Volatiles Analysis: <br />The method blank analyzed on 6/1/97 had the surrogate 4-bromofluorobenzene below <br />acceptance criteria. All other associated quality control and samples had this surrogate <br />within acceptance criteria. <br />Method 8080 PCB/Pesticide Analysis: <br />The laboratory control sample analyzed on 6/6/97 had 2,4-D above acceptance criteria. <br />There were no detections for this compound in the associated samples. <br />Due to a computer limitation, the surrogates for the laboratory control samples and the <br />matrix spike/matrix spike duplicates are incorrectly flagged as being outside of acceptance <br />' criteria. The true recoveries for pesticides are 62% for tetrachloro-m-xylene and 109% <br />for decachlorobiphenyl in the laboratory control sample and 77% for tetrachloro-m-xylene <br />and 109% for decachlorobiphenyl in the laboratory control sample duplicate. The true <br />recoveries for PCB's are 52% for tetrachloro-m-xylene and 80% for decachlorobiphenyl in <br />the laboratory control sample and 64% for tetrachloro-m-xylene and 83% for <br />' decachlorobiphenyl in the laboratory control sample duplicate. <br />Toxaphene was above ]0% relative percent difference in the initial calibration. This <br />' compound was not recognized in the associated samples. Endrin and aldrin were <br />reported from the confirmation column in the LCS/I.CD due to coeluting compounds. <br />Gamma-BHC was within acceptance criteria in the LCS/LCD but outside of relative <br />' percent difference criteria. Endrin was also above acceptance criteria in the ending <br />calibration verification standard. These compounds were not detected in the associated <br />samples. <br />Linda L. Benkers Kathy lausmeier <br />' QA/QC Coordinator Laboratory Supervisor <br />.n. ~ y..0~ or e~ T~ wu : nn..h : u~c ~.c.-. ~ ._. ._ r x~ . ~ n..o~- ~~ ~m wm ~y~fawe i~ v em~~ ani .~ mm..v ~ +v o• ~ ca -e . e re r.~ _a •.aiv~ia ~~ <br />