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MRR 09 '9H 14 58 RCGiHRGLER HRILLY ~ P.2 <br />MEMORANDUM <br />TO: Harry Pouy <br />FROM: Ann¢ Maest ,~ <br />DATE: 9 March 1993 <br />SUBJECT: Analytical work at Core Labs <br />It is my understanding that we decided at the February 19,1993 meeting in Dt;trver to collect <br />samples for nitrate-nitrite but only have them analyzed if the sample had detbctable ryanide <br />concentrations. Nitrate-nitrite is an interferant in the ryanide analytical procedure. To do <br />this would involve having Core Labs rua the samples for cyanide before the 14day holding <br />time elapses, give me an interim report, then log-in and analyze the relev~ttt samples for <br />nitrate-nitrite -= all within the 28-day holding time required for nitrate-nitrit@. Because this <br />is out of the normal order of things (i.e., the report usually comes at the e>~d of the whole <br />analytical process), Core Labs will charge 5% of the total invoice to make this change in the <br />normal procedure. The total invoice is estimated to be "$1700; 5% of thig is $85.00. To <br />run the samples collected at the process points for nitrate-nitrite would ost $136.00 (8 <br />samples x $17/sample). Whether or not the samples are run for nitrate-m e, the cost will <br />be at least $85.00. It seems to me that for a difference of only $51.00 it s more sense <br />to just run the samples nitrau-nitrite along with the other samples and 'not ask for an <br />interim report <br />On another topic, it turns out that Core Labs will only use our samples for the internal lab <br />CC check if we request it. In the interest of figuring out how well the lab is doing on its <br />cyanide determinations, !suggest that we ask the lab to use one of the process point <br />samples, preferably the collection pond sample, for the spike recovery~CC t$st. This would <br />cost an additional ~$ 5. I feel there is no need to use our sample fpr the internal <br />duplicate test, which uld cost an additional $155, because we collected field duplicates. <br />~o r' <br />Please advise me on how I should proceed on these two points as soon 8s possible. Tf <br />posstble, I would like to call Core labs back tomorrow with an answer so we don't run up <br />against the holding time for cyanide (the samples were delivered to the lab oq Friday, March <br />5th, and they must be analyzed for ryanide by next Friday, March 19th). <br />Thank you. <br />cc: Alana Scott <br />RCG/Hagler, Bai lly, Inc. <br />l o ` c~ a. ~ Z .~,~ er a.`l~„a-5 <br />