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8 <br />3.1.4 Quality Control Samples <br />Field and Rinse Blank. The field blank and rinse blank again used second-stage DI water <br />from the BMRI laboratory. Total cyanide, WAD cyanide, copper, iron and zinc <br />concentrations were all below detection in both the field and rinse blanks. Al] <br />concentrations measured were below detection in the field blank, but the rinse blank had <br />detectable concentrations of calcium and sodium. The detection limit for calcium in May <br />was 10 times higher than in April (1 vs. 0.1 mg/I). <br />3.2 QUALTPY CONTROL ANALYSES AND RESULTS <br />The Quality Control Report is included as Appendix D of this summary report. In some <br />cases Core Laboratories used samples from the fourth third-party monitoring trip to perform <br />spike and duplicate QA/QC analyses. The identity of the sample (e.g., M-9) is noted in <br />Appendix D next to the analysis I.D. All spike and duplicate analyses involving samples <br />from the fourth third-party monitoring met the required quality control criteria in TR-006. <br />The following samples from the fourth third-party monitoring trip were used for cyanide <br />QA/QC spike analyses: M-9 (WAD cyanide); M-12 (total cyanide); M-13 (WAD cyanide); <br />M-13 duplicate (total cyanide). The following samples were used for cyanide QA/QC <br />duplicate analyses: M-9 (WAD cyanide); RS-5 (total cyanide); upper tailings impoundment <br />(total cyanide), and M-12 (WAD cyanide). All samples were unfiltered. <br />Only one sample, the upper tailings impoundment sample, had any detectable cyanide and <br />only duplicate, not spike, analyses were performed on the sample. For the next third-party <br />monitoring trip, total and WAD cyanide spike recovery analyses should be performed on > <br />unfiltered process point samples to evaluate possible analytical interferences with the cyanide <br />methods as performed on critical samples from the site. <br />33 LABORATORY TURNAROUND TIME <br />Core Laboratories received the samples on May 29, 1993. The date of the Analytical <br />Report from Core Laboratories was June 24, 1993, which is a turnaround time of slightly <br />under one month. <br />RCG/Hagler, Badly, Inc <br />