Compliance Summary Table for the Barker Draw NPDES permit WY ph Results at outfall 001 Associated with Barker Draw NPDES permit WY Statu

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47 Compliance Summary Table for the Barker Draw NPDES permit WY ph Results at outfall 001 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Permit Limit Concentration Lab Sample ID In 5/5/ s.u. G ph s.u. Compliance 7/27/ s.u.* G *The exceedance was not verified. SAR Results at outfall 002 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Permit Limit Concentration Lab Sample ID In 3/1/ G SAR, unitless 6, unitless* Compliance 5/5/2002 No Flow at POC. N/A *This limit is established at the POC and flow was not reaching that point. This was not an exceedance. Dissolved Iron Results at outfall 003 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID In 3/26/ ug/l G Fe, dissolved 1000 ug/l Compliance 12/12/2003 ND (<30 ug/l)* G *The exceedance was not verified. Total Barium Results at outfall 005 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID In 2/7/ ug/l G Ba, total 400 ug/l* Compliance 5/5/2002 No flow at POC N/A *This limit is established at the POC and flow was not reaching that point. This was not an exceedance. SAR Results at outfall 005 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Permit Limit Concentration Lab Sample ID In 2/7/ G SAR, unitless 6, unitless* Compliance 5/5/2002 No flow at POC N/A *This limit is established at the POC and flow was not reaching that point. This was not an exceedance.

48 Compliance Summary Table for the Barker Draw NPDES permit WY ph Results at outfall 005 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Permit Limit Concentration Lab Sample ID In 4/26/ G ph, s.u s.u. Compliance 5/19/ * G *The exceedance was not verified. Total Recoverable Aluminum Results at outfall 008 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID In Al, total *no record of initial exceedance ug/l Compliance 11/11/2002 recoverable 540 ug/l* G *The exceedance was not verified. Total Recoverable Aluminum Results at outfall 009 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID No data *no record of initial exceedance. In Al, total 009 9/11/ ug/l 820 ug/l G Compliance recoverable 9/28/ ug/l G *The exceedance was not verified. Total Recoverable Arsenic Results at outfall 009 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID In 4/26/2004 As, total 9.7 ug/l G ug/l Compliance 5/19/2004 recoverable 1.6 ug/l G *The exceedance was not verified. Total Barium Results at outfall 009 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID In 4/26/ ug/l G Ba, total 1800 ug/l Compliance 5/19/ ug/l G *The exceedance was not verified.

49 Compliance Summary Table for the Barker Draw NPDES permit WY Total Recoverable Aluminum Results at outfall 010 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID In no data Al, total *no record of initial exceedance ug/l Compliance 9/28/2002 recoverable 180 ug/l G *The exceedance was not verified. Dissolved Iron Results at outfall 010 Associated with Barker Draw NPDES permit WY Status Outfall Date Sampled Constituent Chapter 1 Limit Concentration Lab Sample ID 2/27/ ug/l G /3/ ug/l* G In Compliance 010 4/26/2004 Fe, dissolved 1000 ug/l 3980 ug/l** G /19/ ug/l G /24/2004 ND (<30 ug/l)*** G *The exceedance was not verified. A compliance letter was submitted. **The exceedance showed up again during 2004 annual sampling. ***This compliance sample was collected post-refurbishment.

50 Barker Draw Area Watersheds Pennaco Energy, Inc. Storm Runoff Calculations using SCS and HEC-HMS WY Soils C CN = 75 Ia = in. Watershed Watershed Area Hydraulic Length of Watershed Basin Slope (%) Time of Concentration SCS Lag Time Reservoir Volume Precipitation Calculated Runoff Volume from Event (sq mi) (feet) (hours) (hours) (acre-ft) (acre-ft) Barker Draw ICP , Instream LX Bar Creek Water Quality Precip 25yr-24hr 2.9 in Na Mg Ca EC Precip 10yr-24hr 2.5 in mg/l mg/l mg/l umhos/cm Precip 2yr-24hr 1.5 in Barker Draw ICP , Precip 25yr-24hr 2.9 in Precip 10yr-24hr 2.5 in CBM Water from NPDES Permit WY Precip 2yr-24hr 1.5 in Na Mg Ca EC mg/l mg/l mg/l umhos/cm

51 Barker Draw Specific Conductance Mixing Calculations Pennaco Energy, Inc. WY Instream LX Bar Creek Water Quality EC umhos/cm Year Storm Mix Runoff Water CBM Water from NPDES Permit WY Resultant Concentrations for 2-year event CBM Water Runoff Water Produced 2-Year Storm Volume Volume Drainage EC EC Resultant EC mg/l (acre-feet) (acre-feet) Barker Draw ICP Barker Draw ICP Year Storm Mix Runoff Water CBM Water from NPDES Permit WY Resultant Concentrations for 10-year event CBM Water Runoff Water Produced 10-Year Storm Volume Volume Drainage EC EC Resultant EC mg/l (acre-feet) (acre-feet) Barker Draw ICP Barker Draw ICP Year Storm Mix Runoff Water CBM Water from NPDES Permit WY Resultant Concentrations for 25-year event CBM Water Runoff Water Produced 25-Year Storm Volume Volume Drainage EC EC Resultant EC mg/l (acre-feet) (acre-feet) Barker Draw ICP Barker Draw ICP

52 Barker Draw SAR Mixing Calculations Pennaco Energy, Inc. WY Instream LX Bar Creek Water Quality Na Mg Ca mg/l mg/l mg/l Year Storm Mix Runoff Water CBM Water from NPDES Permit WY Resultant Concentrations for 2-year event CBM Water Runoff Water Drainage Na Mg Ca Na Mg Ca SAR Na Mg Ca Na Mg Ca SAR Na Mg Ca Na Mg Ca Resultant SAR Produced Volume 2-Year Storm Volume mg/l mg/l mg/l meq/l meq/l meq/l mg/l mg/l mg/l meq/l meq/l meq/l mg/l mg/l mg/l meq/l meq/l meq/l (acre-feet) (acre-feet) Barker Draw ICP Barker Draw ICP Year Storm Mix Runoff Water CBM Water from NPDES Permit WY Resultant Concentrations for 10-year event CBM Water Runoff Water Drainage Na Mg Ca Na Mg Ca SAR Na Mg Ca Na Mg Ca SAR Na Mg Ca Na Mg Ca Resultant SAR Produced Volume 10-Year Storm Volume mg/l mg/l mg/l meq/l meq/l meq/l mg/l mg/l mg/l meq/l meq/l meq/l mg/l mg/l mg/l meq/l meq/l meq/l (acre-feet) (acre-feet) Barker Draw ICP Barker Draw ICP Year Storm Mix Runoff Water CBM Water from NPDES Permit WY Resultant Concentrations for 25-year event CBM Water Runoff Water Drainage Na Mg Ca Na Mg Ca SAR Na Mg Ca Na Mg Ca SAR Na Mg Ca Na Mg Ca Resultant SAR Produced Volume 25-Year Storm Volume mg/l mg/l mg/l meq/l meq/l meq/l mg/l mg/l mg/l meq/l meq/l meq/l mg/l mg/l mg/l meq/l meq/l meq/l (acre-feet) (acre-feet) Barker Draw ICP Barker Draw ICP

53 NDPES Permit Renewal Application Pennaco Energy, Inc. LS Draw - Spotted Horse WY HUC March 11, 2004 Page 21 of 25

NM Water Resources Research Institute Environmental Conditions of the Animas and San Juan Watersheds with Emphasis on Gold King Mine

The Gold King Mine Spill in the Context of Historical Water Quality Impacts to Utah s San Juan River and Lake Powell NM Water Resources Research Institute Environmental Conditions of the Animas and San