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Baseline Hydrologic Monitoring Plan — Hansen Project 28 <br />Colorado National Pollution Discharge Elimination System (NPDES) requirements for hard rock and metal <br />mines. The regulatory basis for surface water quality is described in Section 4.6. <br />3.4.1 Field Parameters <br />Both field and laboratory parameters are evaluated. Field parameters include temperature, pH, electrical <br />conductivity, dissolved oxygen, oxidation/reduction potential (ORP, or Eh), and stream flow, as shown in <br />Table 9. <br />Table 9. Field Parameters for Surface Water Monitoring <br />Parameter Precision/Units <br />Stream Flow <br />0.01 cfs <br />Temperature <br />0.1 °C <br />pH <br />0.01 s.u. <br />Electrical Conductivity <br />1 µmhos /cm <br />Dissolved Oxygen <br />0.01 mg/L, 1% <br />ORP <br />1 my <br />3.4.2 Laboratory Analytical Suite <br />Surface water samples are analyzed for one of three analytical suites developed for the Project. Laboratory <br />quote IDs are given in parentheses. <br />• The initial comprehensive analytical suite ( "Taylor- Ranch -SW ") contains 74 parameters listed in <br />Table 10. <br />• The revised analytical suite developed in 2010 ( "T- Ranch -SW- Short") includes 43 laboratory <br />parameters listed in Table 10 and includes progressive rad screening described below. <br />• The expanded analytical suite developed in 2011 ( "Taylor -SW- NPDES -Bkg ") includes NPDES <br />parameters required under CDPHE rules for discharge permits from hardrock and metal mines. <br />This analytical suite includes all the analytes in the 2010 revised analytical suite (T- Ranch -SW- <br />Short) plus oil and grease, total phenols, total cobalt, dissolved cobalt, and WAD cyanide. <br />Bacteriological samples have also been collected from one sampling event. However, due to the <br />remoteness of the site and extremely short hold timesz, bacteriological samples are not routinely <br />analyzed. <br />Currently, samples from nine of the twelve surface stations are analyzed using the 2010 revised analytical <br />suite (T- Ranch -SW -Short) and three stations (SW10 -FC, SW11 -MT, and SW12 -HG) are analyzed using <br />the 2011 background NPDES analytical suite (Taylor -SW- NPDES -Bkg). <br />2 Samples for bacteriological analysis must be collected, couriered to the laboratory, and analyzed all within 24 hours. <br />4153A.140129 Whetstone Associates <br />