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'~,' <br />WeeCarn At1eB <br />Intxrnetionel <br />. um~,oa,.. cmm.~, <br />CORE LABORATORIES <br />Sample Delivery Group Narrative <br />Date: November 15, 1993 <br />Customer: RCG Hagler-Bailly <br />Project: RCG Hagler-Bailly <br />Core Laboratories Project Number: 932003 <br />On October 13, 1993, Core Laboratories received 10 water samples for <br />metals and general inorganic analysis. The following information is <br />pertinent to the interpretation of this data package. <br />Please note that the total cyanide method duplicates analyzed on <br />October 20, 1993, for samples RCG-SU and RCG-6U (Core Laboratories <br />identification 932003 5-6), did not meet acceptance criteria. The <br />samples were reanalyzed for total cyanide and reported under Core <br />Laboratories identification 932003 11-12. In order to expedite the <br />reanalysis for T-CN on samples RCG-5U and RCG-6U, quality assurance <br />consisted of a laboratory control sample and calibration <br />verification. All reanalysis was performed past the recommended <br />holding time of 14 days. Problems with cyanide recovery on this type <br />of matrix have been encountered in the past with samples submitted by <br />RCG Hagler-Bailly. The problem is under investigation. <br />The weak acid dissociable cyanide matrix spike analyzed cn October <br />21, 1993, and a total cyanide matrix spike analyzed on October 20, <br />1993, reported high recoveries (1330 . Both samples were fortified <br />with 0.25 mg/L of cyanide. Dilution of the color was required to <br />bring the sample absorbance down to within the standard concentration <br />range. This dilution also reduced the amount of fortification, <br />significantly affecting the spike recoveries. <br />The analysis for total cyanide on sample RCG-3U (Core Laboratories <br />identification 932003-003) exceeded the recommended holding time by 2 <br />days. The sample was placed on the wrong shelf in the cold storage <br />area and was not found until after the holding time had expired. <br />Analysis was performed the day the sample was found. <br />Patrick J. McEntee <br />Senior Chemist <br />q`l~i~ 1%!L~e~-ate/ <br />Linda L. Benkers <br />QA/QC Coordinator <br />m.erye.oyv.n.sywm.m...~nme mm..ea.ewm m.weaunmmserrmeeWwu.n mrwv...umw .n mna.r.m win, npmw some .n e.rpw.mnw m~vs ep.aee np. <br />em ti si..P^.'. N fo. umn.n, Ce.lsv.ee sev. err.. n r.mebry w •.n. n.rnm, d npeM.nm~b ..pe+n ~mtl.e. o min vmomM1. VR. osma. a pen.u.rw a m, a 0e. mr e <br />me mmwr.ow,q...naen~m..om wn w.a rrn n.m. waw nraum~w nrnem...mw~ in.nom.wi mianvmoa..m~e.m.m..men m...n.n +mmwid ca.,.mm.. <br />