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<br />150 U.S. sieve size (BMG, 1989). MK personnel did not access the site area; therefore, <br />samples of potential, uncontained source material were not collected during this SI. <br />The historic cyanide heap leach pad covered an area of approximately 8 acxes. Material <br />composing the historic heap leach pad has been removed and entered into the mine's <br />process flow at the mill faality. The former areal extent of the heap leach pad has been <br />graded and reportedly seeded to encourage revegetation (BMG, 1994). <br />4.0 DATA USABILITY <br />All surface water and sediment samples were submitted to a contract laboratory program <br />(CIp) laboratory and analyzed under RAS CLP protocols for Target Analyte Ust total <br />metals and cyanide. Analytical results were validated by the ESAT contractor, according <br />to CLP Data Validation Functional Guidelines. The laboratory data sheets and data <br />validation summaries are included in Appends B. The quality assurance review indicated <br />that the analytical data are acceptable with the qualfications noted below. <br />Cyanide results for all aqueous and sediment samples were qualified as estimated- <br />undetected 'UJ' due to a failure to distill and analyze amid-range standard in assocation <br />with the sample analyses. Due to the lack of other quality affecting issues related to the <br />cyanide analyses, there is no clear indication that the laboratory's ability to detect cyanide <br />at concentrations near the detection limit was. compromised. <br />Arsenic, lead, thallium and zinc were detected in preparation and continuing calibration <br />blanks in association with the analysis of multiple aqueous samples. Results for these <br />elemenrts were qualified as estimated-undetected in corresponding field samples. Iron <br />and manganese concentrations for all sediment samples were qualfied as estimated due <br />to duplicate analyses outside of control limits, producing an unknown bias to the results. <br />All arsenic sediment concermations were qualfied as estimated due to negative blank <br />contamination, indicating low biased results. <br />Multiple elements were detected in the equipment decontamination rinse blank BM-SW- <br />07/MHCR77 at concentrations below contract required detection limits (CRDLS). <br />angxua~.mworanc - 5 - ~ a o~~na <br />