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~ ~ Inc <br />7 ~ t~JC Y-'1J F~V.S'- ~ FTJ <br />o a <br />BOOItCLIFFS LABORATORY DIVISION <br />1475 PINE GROVE ROAD <br />P.O. BOX 77401 R <br />STEAMBOAT SPRINGS, CO 80477 <br />13031 879-6260 <br />TELEX 510-100-3880 <br />September 6, 1985 <br />Getty Twentymile Coal Company <br />29515 Routt County Road I:27 <br />P. O. Box 897 <br />Oak Creek, Colorado 80467 <br />Attn: Mr. Rick Tift <br />Dear Rick: <br />To follow-up on my phone call to you last week, this letter details the <br />problems we discussed regarding ACZ INC.'s performance of Total Zinc analyses <br />on samples received from Getty Twentymile Coal Company. Further, I have <br />outlined the steps we have taken to eliminate future problems. <br />ACZ INC. purchased a new Perkin-Elmer Inductively Coupled Plasma (ICP) <br />Spectrophotometer last spring. Since June 13, 1985, ACZ INC. has utilized <br />the ICP for the analysis of Total Zinc. Inspection of quality control data <br />for the Total Zinc analyses indicated the values were acceptable. However, <br />closer inspection revealed that the Total Zinc analyses by ICP are prone to <br />severe interferences. Therefore, I must recommend these figures not be used <br />for reporting purposes. <br />I sincerely apologize for the inconvenience these errors may have caused you. <br />We have issued you the enclosed Credit Memo to cover the cost of all past <br />Total Zinc analyses we performed for Getty Twentymile Coal Company using the <br />ICP. Also enclosed please find a complete list of samples which were <br />analyzed for Total Zinc since June 13th, along with sample date, lab and <br />sample identification, original and, where possible, corrected analytical <br />results. ACZ INC. reanalyzed your samples using Atomic Absorption <br />Spectroscopy (AAS) in order to attain these values. Unfortunately, we were <br />unable to re-analyze all your samples due to disposal of samples following <br />the 30-day retention period. <br />In addition to the use of AAS for all future Total Zinc analyses, ACZ INC. <br />has taken the following corrective action: <br />m In accordance with our Quality Assurance P,•ogram, ACZ I11C. will <br />strictly adhere to all inspection procedures for raw and QC data; <br />~ ACZ INC. has increased the number of Quality Control Samples on all <br />Total Zinc runs; <br />_~, ~~ <br />v ~ ~ L~ ~ S <br />