# Meteorological and Hydrogen Cyanide (HCN) Fence Line Monitoring Final Report

H OMESTAKE 

# M INING 

# C OMPANY OF 

# C ALIFORNIA 

# , B

ARRICK 

# R UBY 

# H ILL 

# M INE

P ROJECT 

### 59-57-4 J UNE 

### 2010

### ii 

# CONTENTS Page 1.0 INTRODUCTION .............................................................................................................. ........................................... 1 1.1 HCN Monitor Location ...................................................................................................... ...................................... 1 1.2 HCN Monitoring System Description ......................................................................................... ............................. 5 1.3 Data Recovery ............................................................................................................. .......................................... 5 1.4 Quality Control ........................................................................................................... ............................................. 6 2.0 METEOROLOGY ............................................................................................................... ........................................ 7 2.1 Winds ..................................................................................................................... ................................................ 7 2.2 Temperature, Relative Humidity, and Barometric Pressure ................................................................... ............ 11 2.3 HCN Concentration ......................................................................................................... ..................................... 11 3.0 DATA ANALYSI S ............................................................................................................. ........................................ 14



## Tables Table 1: Sensor Locations .................................................................................................... ........................................... 5 Table 2: Data Recovery ....................................................................................................... ............................................ 6 Table 3: Frequency of Hourly Averaged Winds by Direction and Speed ........................................................... .............. 8 Table 4: Frequency of Hourly Averaged Winds by Direction and Stability ....................................................... ................ 9 Table 5: Temperature, Relative Humidity, and Barometric Pressure ............................................................. ................ 11 Table 6: HCN Concentration ................................................................................................... ....................................... 13 Table 7: Measured HCN Concentration Analysis ................................................................................. .......................... 15 

## Figures Figure 1: HCN Monitoring Site ................................................................................................ ......................................... 2 Figure 2: Large Scale Area Map ............................................................................................... ....................................... 3 Figure 3: Refinery ........................................................................................................... .................................................. 4 Figure 4: Wind Frequency Distribution ........................................................................................ ................................... 10 Figure 5: Measured HCN Concentration Analysis ................................................................................ ......................... 16 Figure 6: Wind Frequency for February 16, 2010 (Highest Concentration Day) ................................................... ......... 17 Figure 7: Wind Frequency for December 30, 2009 (Day with Hi ghest Percent of Winds Blowing Towards Monitor) .... 17 

## Appendices Appendix A: Hourly Meteorological Data Appendix B: HCN Data Appendix C: Site Check Forms, Audits, and Calibration Appendix D: Hydrogen Cyanide (HCN) Fence Line Monitoring Plans

### 1 

### SECTION 1 

# INTRODUCTION This report summarizes the meteorological and hydrogen cyanide (HCN) data collected at the Homestake Mining Company of California, Barrick Ruby Hill Mine (Ruby Hill) HCN monitor from December 9, 2009, through April 11, 2010. The HCN monitoring station became operational on December 7, 2009, at 1:00 p.m., and the first 24-h our HCN sample was taken on December 9, 2009. The HCN monitoring equipment and samp ling procedures followed Ruby Hill’s Site-Specific Hydrogen Cyanide (HCN) Fence Line Monitoring Plan , approved by EPA on November 25, 2009, and the general Hydrogen Cyanide (HCN) Fence Line Monitoring Plan , approved by EPA on October 9, 2009. The meteorological sampling procedures were performed in accordance with the U. S. EPA Quality Assurance Handbook of Air Pollution Measurement Sy stems Volume IV - Meteorological Measurements (EPA-600/R94-038D), March 1995. Ruby Hill operates a gold mining facility located 0.7 mile northwest of Eureka, Nevada on Highway 50. The facility operates an open-pit mine. Gold recovery operations include: ore crushing, heap leaching, carbon adsorption, stripping and regenerati on, electrowinning, retorting, and refining. The leach solutions used in the gold recovery processes contain cyanide. These solutions have the potential for low levels of hydrogen cyanide (HCN ) formation and emission to the atmosphere. To assess the ambient concentrations of HCN, Ruby Hill installed and operated an HCN monitor downwind of the potential HCN sources ne ar the Ruby Hill operations area. 

# 1.1 HCN Monitor Location Aerial photos and shaded relief maps are provided in Figures 1 through 3. Figure 1 provides an aerial photo of the mine site, the operations boundary, the potential HCN sources, and the HCN monitor location. Figure 2 provides a shaded relief map of the area surrounding the Ruby Hill mine and shows the location of the HCN monitor. The HCN monitor is located at 588,792 meters east, 4,375,085 meters north, UTM Zone 11N, NAD83, elevation 6,544 feet. Figures 1 and 3 highlight the potential sources of HCN emissions at Ruby Hill. These sources include an active leach pad, Carbon-in-Column (CIC) tank s, pregnant and barren po nds, a pregnant tank adjacent to the pregnant and barren ponds, a barren tank adjacent to the leach pad, and a single stack for the electrowinning cells and pregnant and barre n tanks at the refinery. A closer view of the refinery area is shown in Figure 3.

### 5 

# 1.2 HCN Monitoring System Description The HCN monitoring system consisted of a data logger connected to a low-flow pump which is connected through sorbent tubes to an ambient air inlet. The sorbent tubes captured any HCN in the ambient air and were sent to the ALS Laboratory Gr oup in Salt Lake City, Utah, for analysis. The laboratory analysis was based on NIOSH Method 601 0. The sampling schedule followed a 1-in-3 day calendar and continued for a total sa mpling period of four months. During a run day, all meteorologic al parameters were collected at two-second intervals and timeaveraged into 15-minute values. Wind speed, wi nd direction, ambient temperature, relative humidity, and barometric pressure as well as flow rate through the sorbent tubes were collected at the HCN monitor. The parameters collected are shown in Table 1. The measurement height of the HCN monitor inlet was two meters. The height of the wind instruments was 10 meters. All other pa rameters were measured at two meters. Table 1: Sensor Locations (meters above the ground)



### Parameter Height Wind speed* 10.0 Wind direction* 10.0 Ambient temperature 2.0 Relative humidity 2.0 Barometric pressure 2.0 Sampler flow 2.0 *Wind data from December 9, 2009, through January 6, 2010, and from March 2, 2010, through March 9, 2010, were obtained from the collocated Ruby Hill meteorological station (see Section 2.1). 

### The meteorological data from the HCN monitor were recorded by the onsite digital Data Acquisition System (DAS) equipped with cellular internet for data transfer. The parameters were digitally processed by the DAS into 15-minute averages. The 15-minute averages were transmitted to Air Sciences for quality assurance checks, population into the database, and calculation of one-hour averages. 

# 1.3 Data Recovery Data recovery rates for all paramete rs are presented in Table 2. The data recovery rate for the wind parameters from the combined data set from the HCN monitor and the Ruby Hill meteorological station was 99.4 percent. The data recovery rate for the ambient temperature and relative humidity parameters was 96.9 percent. The data recovery rate for the barometric pressure was 86.0 percent. The data recovery rates for the meteorological parameters were due to the site being shut down for mainte nance and data logger program updates. The lower

### 6 

### data recovery rate for the barometric pressure pa rameter was due to a data logger error, which was corrected on December 18, 2009. A second data logger error resulted in invalid barometric pressure readings from March 2, 2010, at 12:00 p.m., to March 9, 2010, at 9:30 a.m. The data recovery rates at the HCN monitor are above the recommended rate of 90 percent for each meteorological parameter, except for the barometric pressure. The data recovery rate for the flow rate through th e sorbent tubes was 96.9 percent. The data recovery rate for the HCN concentration from the sorbent tu bes was 100 percent. Both parameters are above the recommended recovery rate of 75 percent. Table 2: Data Recovery December 9, 2009 - April 11, 2010 (percent) 

### Recorded Recommended

Parameter Observations Recovery Rate Recovery Rate HCN Station Wind speed* 2,959 99.4 90 Wind direction* 2,959 99.4 90 Ambient temperature 977 96.9 90 Relative humidity 977 96.9 90 Barometric pressure 867 86.0 90 Sampler flow 977 96.9 75 HCN concentration 42 100.0 75 *The data recovery rate is for the combined data set from the HCN monitor and the Ruby Hill meteorological station. 

# 1.4 Quality ControlThe primary meteorological quality objectives are based on U.S. EPA guideline documents (EPA454/4-87-007, Section 6.1.1, Ambient Monitoring Guidelines for Prevention of Significant Deterioration [PSD] and EPA-454/R-99-005, February 2000, Table 5-1, Meteorological Monitoring Guidance for Regulatory Modeling Applications). The quality control objectives for the HCN monitor can be found in Appendix D.

### 7 

### SECTION 2 

# METEOROLOGY The instantaneous wind speed, wind direction, te mperature, relative humidity, and barometric pressure data collected at the HCN station during the monitored period were processed into hourly averages. Wind speed and wind direction are repo rted for all days during the sample period. Temperature, relative humidity, and barometric pr essure are reported for the run days during the period. Appendix A presents the hourly averages for each parameter in SAROAD (Storage and Retrieval of Aerometric Data) format. A summary of this data for each parameter is shown in the following sections. 

# 2.1 Winds The HCN monitor began collecting wind speed and wind direction data on January 6, 2010, at 11:00 p.m. Due to a data logger error, wind speed and wind direction data was also not collected from the HCN monitor between March 2, 2010, at 12:00 p.m. an d March 9, 2010, at 9:30 a.m. Hourly-averaged wind speed and wind direction data from December 9, 2009, through January 6, 2010, and from March 2, 2010, through March 9, 2010, was obtained from the monitoring station operated by Ruby Hill, which is collocated with the HCN monitor. These hourly averaged wind data were sent electronically to Air Sciences, where they were tran sferred into the database along with the data from the HCN monitor. The combined wind data set had a 99.4 percent data recovery rate. Hourly averaged winds measured at the site duri ng the sampling period are summarized in Table 3 as frequency distributions of winds by direction and speed. The data period contains approximately 124 days (2,959 hours) of wind information. Figure 4 shows the distribution of hourly averag ed winds by direction and speed for the sampling period. The mean wind speed for the period was 3.2 m/s (7.2 mph). The winds were predominately from the southeast to the south with a secondary peak from the west-northwest to the north. A breakdown of the wind speed profile for this period yields the following: There were 4.7 percent calm wind speeds (<0.447 m/s), 29.7 percent of th e winds were between 0.5 m/s (1.1 mph) and 1.5 m/s (3.4 mph), 44.9 percent of the winds were between 1.5 m/s and 5 m/s (11.2 mph), and 20.9 percent of the wind speeds were greater than 5 m/s. Table 4 shows a frequency distribution of hourly av eraged winds by directio n and stability class. Stability classes A, B, and C indicate low-speed daytime winds, which are categorized as unstable or high-dispersion-potential winds with class A being the least stable. Stability classes E and F indicate the frequency of low-speed nighttime winds, whic h are categorized as stable or low-dispersionpotential winds with class E being the least stable. The D stability class is a mixture of daytime and nighttime winds, generally at higher speeds. This class is also referred to as neutral stability.

### 8 

### The lower-speed daytime winds (classes A, B, and C) made up 31.0 percent of the total winds and were predominately from the northwest to the north with a secondary peak from the south-southeast. The lower-speed nighttime winds (classes E and F) constituted 32.0 percent of the total winds and were predominately from the south-southeast to the south. The higher-speed winds (class D) comprised 36.7 percent of the total winds and were pr edominately from the southeast to the south. Table 3: Frequency of Hourly Averaged Winds by Direction and Speed December 9, 2009 - April 11, 2010 (percent of occurrence)



### Calm (< 0.447 m/s) = 4.7% Mean wind speed = 3.2 m/s Data presented as direction from which wind is blowing. Mean Direction 0.5 <1.5 1.5 <3 3 <5 5 <7 7 <10 >=10 All Speed N 4.1 2.7 0.3 0.1 0.0 0.0 7.3 1.6 NNE 3.2 0.4 0.0 0.0 0.0 0.0 3.6 1.0 NE 1.1 0.2 0.0 0.0 0.0 0.0 1.3 0.9 ENE 1.1 0.1 0.0 0.0 0.0 0.0 1.2 0.9 E 0.5 0.2 0.1 0.1 0.0 0.0 1.0 2.0 ESE 0.7 0.2 0.3 0.2 0.3 0.0 1.6 3.5 SE 0.8 0.6 1.3 1.5 1.4 0.1 5.7 4.9 SSE 2.5 8.6 12.1 8.0 3.9 0.8 35.9 4.4 S 1.4 2.7 3.7 1.5 1.2 0.3 10.8 4.0 SSW 1.0 1.0 0.4 0.1 0.0 0.0 2.5 2.2 SW 1.0 0.4 0.3 0.0 0.0 0.0 1.8 1.9 WSW 1.0 0.6 0.1 0.0 0.0 0.0 1.8 1.6 W 1.2 0.4 0.3 0.1 0.1 0.0 2.0 2.0 WNW 1.8 1.3 1.4 1.0 0.1 0.0 5.4 3.0 NW 3.5 2.7 0.7 0.0 0.0 0.0 6.9 1.7 NNW 4.8 1.5 0.3 0.1 0.0 0.0 6.7 1.4 All 29.7 23.6 21.3 12.7 7.0 1.2 95.3 3.2 Speed Class Intervals (m/s)

### 9 

### Direction A B C D E F All N 2.7 1.8 0.7 0.6 0.7 1.1 7.7 NNE 1.4 0.7 0.7 0.5 0.3 0.3 4.1 NE 0.5 0.3 0.2 0.1 0.2 0.4 1.7 ENE 0.5 0.2 0.1 0.1 0.1 0.4 1.5 E 0.3 0.2 0.2 0.1 0.2 0.3 1.3 ESE 0.3 0.3 0.3 0.5 0.1 0.3 1.8 SE 0.2 0.3 0.4 3.9 0.3 0.7 5.9 SSE 0.1 1.4 2.6 20.1 10.3 1.5 36.1 S 0.2 0.5 1.2 5.8 1.8 1.6 11.1 SSW 0.3 0.4 0.3 0.6 0.6 0.7 2.8 SW 0.1 0.2 0.2 0.3 0.5 0.6 1.8 WSW 0.2 0.1 0.2 0.3 0.6 0.5 1.9 W 0.2 0.3 0.4 0.4 0.5 0.4 2.2 WNW 0.3 0.7 1.3 1.6 1.0 0.9 5.9 NW 1.1 1.5 0.8 0.9 1.1 1.6 7.1 NNW 1.8 1.0 1.2 0.8 0.6 1.5 6.9 All 10.2 9.9 10.9 36.7 19.0 13.0 99.7 Stability Class Table 4: Frequency of Hourly Averag ed Winds by Direction and Stability December 9, 2009 - April 11, 2010 (percent of occurrence)

### 10 Figure 4: Wind Frequency Distribution

4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

0.5 1 5 8 10 m/s Hourly Met Data Wind Frequency Distribution: 12/09/09 - 04/11/10 Calm = 138 Missing = 16 Number of non-calm/missing = 2,821

### 11 

# 2.2 Temperature, Relative Humi dity, and Barometric Pressure The temperature mean and extremes for the sampling period are presented in Table 5. The average 2-meter temperature for the period was -1.6 ° C (29.1 ° F). The maximum hourly averaged 2-meter temperature was 14.2 ° C (57.6 ° F) and occurred on the afternoon of April 8, 2010. The minimum hourly averaged 2-meter temperature was -16.9 ° C (1.6 ° F) and occurred on the morning of December 9, 2009. The relative humidity mean and extremes for the sampling period are presented in Table 5. The average relative humidity for the period was 65 percent. The maximum hourly average was 100 percent and the minimum was 13 percent. Barometric pressure data collected during the sa mpling period (beginning December 18, 2009, and excluding March 2, 2010, to March 9, 2010) are summarized in Table 5. The average barometric pressure for the period was 599 mmHg. The maximu m hourly averaged barometric pressure for the period was 608 mmHg and occurred for five consecut ive hours in the evening of March 15, 2010. The minimum hourly averaged barome tric pressure for the period was 582 mmHg and occurred for two consecutive hours in the evening of January 20, 2010. Table 5: Temperature, Relative Humidity, and Barometric Pressure December 9, 2009 - April 11, 2010



### Parameter Temperature ( ° C) 

### Relative Humidity (%) Barometric Pressure (mmHg) Avg. -1.6 65 599 Max. 14.2 100 608 Min. -16.9 13 582 

# 2.3 HCN Concentration As mentioned in Section 1.3 above, the barometric pressure began recording on December 18, 2009, and was not recorded for the period between March 2, 2010, and March 9, 2010. For the run days on December 9, 2009, December 12, 2009, December 15, 2009, March 3, 2010, and March 6, 2010, the standard barometric pressure at the site elevation (597 mmHg) was used to calculate the HCN concentration from the mass of HCN collected. As shown in Table 5, the average barometric pressure from the data collected (599 mmHg) was within 2 mmHg of the standard pressure. The HCN concentration data collected during the samp ling period are summarized in Table 6. For all of the run days, except January 8, 2010, January 29 , 2010, February 10, 2010, and February 16, 2010, the HCN concentration was below the detection level of 0.21 μg/sample. Of the days with a

### 12 

### detectible level of HCN, the highest HCN concentration corrected to standard conditions 1 

### was 0.24 μg/m 3 

### and occurred on February 16, 2010. Using the detection level mass of HCN and the sample flow rate, the HCN concentration for all of the non-detect days was estimated. Based on the sample flow rates and the detection level, it is possi ble for non-detect days to show a higher HCN concentration than the days that had a detectable amount of HCN; however, the actual HCN concentration for the non-detect days is below the calculated amount. The HCN concentration in the field blank was below the detection level of 0.21 μg/sample. All HCN concentrations were below the EPA reference concentration of 3E-3 mg/m 3 

### . 2

1 Standard conditions are 1 atmosphere and 25 ° C. 2 U.S. EPA Integrated Risk Information Syst em. http://www.epa.gov/iris/subst/0060.htm.

### 13 Table 6: HCN Concentration December 9, 2009 - April 11, 2010 (μg/m 3 

### ) HCN Concentration Actual Standard Run Da y * Conditions Conditions C 12/09/2009 <0.07 a 

### <0.08 a 

### 12/12/2009 <0.06 a 

### <0.07 a 

### 12/15/2009 <0.07 a 

### <0.07 a 

### 12/18/2009 <0.07 a 

### <0.08 a 

### 12/21/2009 <0.06 a 

### <0.07 a 

### 12/24/2009 <0.07 a 

### <0.07 a 

### 12/27/2009 <0.11 <0.12 12/30/2009 <0.11 <0.13 01/02/2010 <0.12 <0.14 01/05/2010 <0.15 <0.17 01/08/2010 0.14 0.16 01/11/2010 <0.11 <0.12 01/14/2010 <0.12 <0.14 01/17/2010 <0.16 <0.19 01/20/2010 <0.14 <0.16 01/23/2010 <0.11 <0.13 01/26/2010 <0.11 <0.13 01/29/2010 0.16 0.18 02/01/2010 <0.19 <0.22 02/04/2010 <0.12 <0.14 02/07/2010 <0.14 <0.16 02/10/2010 0.19 0.22 02/13/2010 <0.14 <0.16 02/16/2010 0.20 0.24 02/19/2010 <0.13 <0.15 02/22/2010 <0.17 <0.19 02/25/2010 <0.13 <0.15 02/28/2010 <0.17 <0.19 03/03/2010 <0.41 <0.48 03/06/2010 <0.41 <0.49 03/09/2010 <0.23 <0.27 03/12/2010 <0.12 <0.14 03/15/2010 <0.10 <0.11 03/18/2010 <0.13 <0.16 03/21/2010 <0.13 <0.15 03/24/2010 <0.17 <0.20 03/27/2010 <0.14 <0.16 03/30/2010 <0.20 <0.24 04/02/2010 <0.12 <0.14 04/05/2010 <0.44 <0.51 04/08/2010 <0.13 <0.16 04/11/2010 <0.13 <0.16 Avera g e <0.15 <0.18 *Start time = 0:00:02; stop time = 0:00:00. a 

### 12/9/09 and 12/18/09 were sampled on the same sorbent tube, 12/12/09 and 12/21/09 were sampled on the same sorbent tube, and 12/15/09 and 12/24/09 were sampled on the same sorbent tube. The HCN concentrations for these run days were estimated based on the mass of HCN collected and the total volume for the 48-hour period.

### 14 

### SECTION 3 

# DATA ANALYSIS Based on the data collected during the monitori ng period, an analysis of wind direction and measured HCN concentration was conducted. As shown in Figures 1 and 2, winds from 302 ° through 311 ° (approximately west-northwest through northwest) blow from the potential HCN sources at the Ruby Hill mine towards the HCN monitor. The percent of winds blowing within this range of directions on each sample day is shown in Table 7 and Figure 5. Table 7 and Figure 5 provide information regarding the correlation between wind direction and measured HCN concentration. The coefficient of determination (R 2 

### ) value for the wind direction and HCN concentration data set is 0.05. Table 7 also provides information regarding the correlation between wind speed and measured HCN concentration. The R 2 

### value for the wind speed and HCN concentration data set is 0.01.

### 15 Table 7: Measured HCN Concentration Analysis December 9, 2009 - April 11, 2010 

### HCN Average Wind Concentration Speed Run Day (μg/m3) No. of Hours Percent (m/s) 12/09/2009 <0.08 0 0 2.1 12/12/2009 <0.07 0 0 8.3 12/15/2009 <0.07 0 0 7.2 12/18/2009 <0.08 2 8 2.4 12/21/2009 <0.07 2 8 5.1 12/24/2009 <0.07 0 0 1.3 12/27/2009 <0.12 0 0 1.6 12/30/2009 <0.13 3 13 1.9 01/02/2010 <0.14 0 0 2.6 01/05/2010 <0.17 0 0 2.1 01/08/2010 0.16 1 4 1.2 01/11/2010 <0.12 1 4 4.0 01/14/2010 <0.14 1 4 1.8 01/17/2010 <0.19 0 0 5.6 01/20/2010 <0.16 0 0 8.8 01/23/2010 <0.13 0 0 1.4 01/26/2010 <0.13 0 0 2.9 01/29/2010 0.18 0 0 1.8 02/01/2010 <0.22 0 0 2.9 02/04/2010 <0.14 1 4 4.1 02/07/2010 <0.16 1 4 1.6 02/10/2010 0.22 1 4 1.8 02/13/2010 <0.16 2 8 2.0 02/16/2010 0.24 0 0 1.7 02/19/2010 <0.15 1 4 1.0 02/22/2010 <0.19 0 0 1.4 02/25/2010 <0.15 2 8 1.7 02/28/2010 <0.19 2 8 1.7 03/03/2010 <0.48 0 0 5.5 03/06/2010 <0.49 0 0 5.5 03/09/2010 <0.27 1 4 3.1 03/12/2010 <0.14 1 4 3.9 03/15/2010 <0.11 0 0 2.5 03/18/2010 <0.16 0 0 2.3 03/21/2010 <0.15 1 4 3.2 03/24/2010 <0.20 0 0 4.6 03/27/2010 <0.16 0 0 2.3 03/30/2010 <0.24 0 0 5.8 04/02/2010 <0.14 0 0 4.4 04/05/2010 <0.51 0 0 3.3 04/08/2010 <0.16 0 0 2.7 04/11/2010 <0.16 0 0 9.2 Average <0.18 Winds Blowing from HCN Sources Towards Monitor

### 16 Figure 5: Measured HCN Concentration Analysis



### Figures 6 and 7 summarize the 24-hour wind dire ction (the direction from which the wind is blowing) and wind speed for the highest HCN concentration day, and the day with the highest percent of winds blowing from the potential HCN sources towards the monitor. The highest abovedetection level HCN concentration was measured on February 16, 2010, when the winds werepredominantly from the south-southeast with a secondary peak from the north to the northnortheast. The day with the highest percent of winds blowing towards the monitor was December 30, 2009, when 13 percent of winds blew from the potential HCN sources towards the HCN monitor. The HCN concentration on December 30, 20 09, was below the detection level. 0 2 4 6 8 10 12 14

0.00 0.10 0.20 0.30 0.40 0.50 0.60PercentofWinds(%)HCNConcentration(μg/m3)



## Run Day HCN Concentration Percent of Winds Towards Monitor

### 17 3% 6% 9% 12% 15% 18% 21% 24% 27% 30% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

0.5 1 5 8 10 m/s

Hourly Met Data Wind Frequency Distribution: 12/30/2009 Calm = 1 Missing = 0 Number of non-calm/missing = 23 

### Figure 6: Wind Frequency for February 16, 2010 (Highest Concentration Day)

Figure 7: Wind Frequency for December 30, 2009 (Day with Highest Percent of Winds Blowing Towards Monitor) 4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

0.5 1 5 8 10 m/s

Hourly Met Data Wind Frequency Distribution: 2/16/2010 Calm = 1 Missing = 0 Number of non-calm/missing = 23

# APPENDIX A 

# Hourly Meteorological DataDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min 12/9/2009 1.1 1.4 1.8 1.4 1.0 0.7 0.9 0.7 0.2 1.2 1.8 1.3 1.4 0.9 0.5 0.4 2.2 4.7 4.8 5.7 5.5 5.3 5.3 4.1 2.3 5.7 0.2 12/10/2009 2.2 2.5 0.9 1.5 3.0 3.7 1.7 0.7 0.1 0.3 0.6 0.8 0.6 0.1 0.3 0.9 3.3 5.8 5.7 4.9 5.1 2.4 0.3 0.2 2.0 5.8 0.1 12/11/2009 1.1 0.9 1.1 0.4 0.5 0.2 0.3 0.7 4.1 5.9 7.4 8.8 9.2 8.5 8.1 8.1 6.4 7.1 6.7 5.0 4.8 5.6 7.1 8.0 4.8 9.2 0.2 12/12/2009 9.5 9.7 10.5 9.4 10.0 10.2 10.2 9.2 9.0 8.3 8.8 9.6 8.8 7.8 9.5 8.2 7.9 5.0 6.7 4.6 5.6 7.9 4.3 6.1 8.2 10.5 4.3 12/13/2009 1.5 0.5 0.5 1.3 0.9 1.8 1.9 2.1 0.8 3.8 2.9 4.6 4.9 4.6 4.2 2.3 0.7 0.7 1.0 0.2 1.6 0.9 0.3 1.4 1.9 4.9 0.2 12/14/2009 2.2 1.8 2.3 0.6 2.4 2.3 2.5 2.8 1.2 0.8 2.1 1.3 0.6 1.2 1.1 1.5 4.7 5.8 6.7 6.7 6.5 4.3 6.1 7.5 3.1 7.5 0.6 12/15/2009 8.3 10.7 8.1 7.1 8.1 8.7 7.8 8.2 7.5 7.1 8.3 7.4 6.0 6.1 7.0 7.3 6.4 7.0 5.0 0.6 3.8 9.0 9.7 7.9 7.2 10.7 0.6 12/16/2009 4.1 1.2 2.4 2.4 1.0 4.3 6.3 2.2 1.7 1.1 0.7 0.9 1.2 0.6 1.1 0.7 2.9 3.2 4.1 4.8 4.9 3.7 2.5 3.9 2.6 6.3 0.6 12/17/2009 3.5 4.0 3.0 3.2 4.4 2.7 2.8 1.9 0.0 0.4 1.1 0.7 0.8 1.8 0.4 0.6 1.5 1.4 2.0 3.0 3.8 3.9 1.7 3.4 2.2 4.4 0.0 12/18/2009 2.3 4.3 4.9 2.4 2.8 2.0 3.0 1.5 0.6 1.0 0.6 1.1 1.3 0.7 1.5 1.0 0.9 2.8 4.1 3.9 4.4 3.8 3.7 3.7 2.4 4.9 0.6 12/19/2009 4.1 5.2 5.1 3.8 2.2 4.3 4.9 4.1 0.9 0.6 1.0 0.5 1.0 0.7 0.9 0.4 1.7 1.3 0.0 0.3 1.6 2.8 1.3 1.9 2.1 5.2 0.0 12/20/2009 0.3 0.6 0.8 1.0 1.1 0.5 0.3 1.2 1.1 1.3 2.5 1.7 2.2 1.5 6.2 5.3 4.1 5.2 5.5 5.4 6.5 1.8 2.6 3.9 2.6 6.5 0.3 12/21/2009 2.7 2.1 2.3 1.0 2.8 5.9 8.2 4.5 2.2 5.1 2.2 1.7 1.9 4.3 6.8 5.5 6.0 7.7 7.5 9.7 10.4 9.4 8.3 8.2 5.3 10.4 1.0 12/22/2009 4.4 1.1 0.7 0.6 1.9 1.7 1.4 1.5 2.9 5.9 5.3 6.7 6.4 5.6 5.5 4.5 3.3 3.8 2.7 2.7 2.4 2.7 2.4 2.4 3.3 6.7 0.6 12/23/2009 1.9 1.8 1.9 2.1 2.5 2.4 1.6 1.6 1.2 2.1 1.6 1.8 2.1 2.1 1.9 2.0 2.1 1.7 1.7 2.0 1.7 1.6 0.7 1.5 1.8 2.5 0.7 12/24/2009 1.4 1.8 0.8 0.2 0.5 0.1 0.4 2.0 0.5 0.7 0.5 0.9 1.9 0.8 0.9 0.3 2.0 2.6 3.1 3.1 3.0 2.0 1.0 2.2 1.4 3.1 0.1 12/25/2009 2.2 2.6 0.8 0.0 0.8 1.2 1.0 2.2 0.7 0.6 1.1 1.0 1.0 1.3 1.8 2.0 1.1 0.3 1.8 3.8 4.3 4.7 4.7 5.2 1.9 5.2 0.0 12/26/2009 5.0 4.2 2.9 0.9 1.5 0.6 0.8 2.3 1.2 2.3 3.6 4.4 1.9 6.9 7.8 6.1 3.5 2.3 5.4 3.3 4.9 3.1 1.2 1.3 3.2 7.8 0.6 12/27/2009 0.9 0.1 2.2 3.2 2.8 2.6 1.9 0.3 1.4 0.7 1.3 1.1 1.1 1.3 0.5 0.2 1.1 2.6 3.6 2.8 0.4 2.9 3.0 1.2 1.6 3.6 0.1 12/28/2009 0.4 0.8 0.5 0.8 0.7 0.5 0.8 2.0 0.4 1.1 1.5 1.4 1.4 1.5 1.6 3.1 4.6 2.9 0.9 2.3 4.1 3.6 4.9 1.4 1.8 4.9 0.4 12/29/2009 1.8 1.7 2.8 0.8 0.2 0.1 0.0 0.0 0.0 0.6 1.0 1.0 1.9 1.3 1.6 1.4 0.5 2.8 3.0 3.9 3.4 1.4 0.8 4.6 1.5 4.6 0.0 12/30/2009 3.0 2.4 1.6 1.0 0.1 2.2 1.1 0.5 3.1 1.7 2.5 4.0 3.6 2.9 0.9 0.9 2.0 0.7 0.7 0.7 1.1 0.7 3.2 4.1 1.9 4.1 0.1 12/31/2009 5.0 4.7 4.4 4.4 5.9 5.8 5.5 2.8 1.8 1.9 1.9 1.2 0.5 1.2 5.1 8.3 3.9 7.8 3.6 4.2 0.7 3.2 1.7 4.6 3.7 8.3 0.5 1/1/2010 2.4 2.3 2.3 3.4 0.8 0.5 0.9 1.2 5.2 2.1 1.2 1.0 1.0 0.1 0.3 1.6 2.5 4.3 3.4 2.9 1.8 1.6 4.5 2.7 2.1 5.2 0.1 1/2/2010 4.7 4.8 2.3 1.1 1.0 1.6 3.4 3.9 2.0 1.4 0.4 1.2 0.9 1.5 0.2 0.1 1.5 4.0 4.7 4.4 4.0 5.4 5.1 4.4 2.7 5.4 0.1 1/3/2010 4.2 4.8 2.8 3.8 4.4 2.5 2.4 1.8 0.6 0.1 1.0 0.8 0.7 0.8 0.3 0.2 0.0 0.1 0.5 1.0 0.7 0.2 0.0 0.7 1.4 4.8 0.0 1/4/2010 0.2 0.1 0.9 0.2 0.1 0.0 0.0 0.4 0.2 0.8 0.6 0.6 0.9 0.7 0.4 0.4 2.9 2.3 5.1 5.8 4.9 2.8 1.8 3.7 1.5 5.8 0.0 1/5/2010 2.2 5.7 5.2 1.1 4.0 5.4 3.1 1.6 0.6 1.8 1.1 0.6 1.0 0.2 0.0 0.2 2.0 2.7 1.6 0.1 1.8 1.2 2.3 2.9 2.0 5.7 0.0 1/6/2010 2.7 2.0 2.5 3.0 3.8 4.2 3.8 3.0 0.8 0.4 0.9 1.1 1.3 1.5 1.1 0.2 0.8 1.8 2.7 1.1 0.4 0.4 0.3 0.5 1.7 4.2 0.2 1/7/2010 0.5 0.4 0.4 0.6 0.5 0.6 0.7 0.8 0.7 1.1 1.0 1.0 0.9 0.9 0.5 1.1 1.9 1.5 1.8 2.1 2.1 2.4 3.0 2.6 1.2 3.0 0.4 1/8/2010 3.3 3.7 3.2 1.0 0.4 0.3 0.7 0.8 0.8 0.8 0.7 0.9 0.7 0.9 0.6 0.4 1.0 0.5 1.3 2.0 1.2 0.9 1.1 1.1 1.2 3.7 0.3 1/9/2010 0.6 0.6 2.1 2.1 1.8 1.5 3.4 1.7 0.5 0.5 0.7 0.7 0.4 0.5 0.5 0.8 2.0 1.2 0.6 0.5 1.1 0.7 1.5 0.8 1.1 3.4 0.4 1/10/2010 0.6 1.2 2.2 1.6 1.0 1.7 1.1 0.5 0.4 0.8 1.0 0.8 0.5 0.4 0.5 0.6 1.7 1.3 1.6 2.2 2.0 1.5 2.0 1.1 1.2 2.2 0.4 1/11/2010 2.3 3.0 3.7 3.0 2.2 1.2 0.8 0.7 2.0 1.0 1.3 0.7 3.5 5.4 4.2 4.9 6.0 7.2 8.2 7.8 8.0 9.4 7.3 5.7 4.2 9.4 0.7 1/12/2010 5.9 7.6 6.1 7.6 5.9 5.0 5.3 7.2 6.6 6.6 6.4 7.6 9.8 8.2 5.6 7.4 8.9 7.9 7.5 8.1 8.3 7.6 7.2 5.5 7.1 9.8 5.0 1/13/2010 6.6 7.3 7.4 8.8 8.3 4.2 5.1 5.9 3.1 1.7 1.0 1.5 3.4 2.6 4.8 4.6 3.7 3.7 3.4 2.3 1.9 1.9 1.6 2.4 4.0 8.8 1.0 1/14/2010 2.5 1.3 0.9 1.7 1.5 0.9 0.9 0.8 0.7 1.2 1.5 1.5 1.2 1.1 0.8 0.6 1.5 3.0 3.5 3.1 3.0 3.2 3.8 3.6 1.8 3.8 0.6 1/15/2010 3.6 4.1 1.6 0.8 1.7 1.3 1.5 1.2 0.8 1.3 0.9 1.2 1.7 2.4 6.0 5.6 6.5 4.7 3.8 3.6 2.9 1.5 3.2 5.0 2.8 6.5 0.8 1/16/2010 5.9 3.9 5.1 4.7 3.6 5.0 3.2 5.0 5.7 4.3 4.2 3.9 3.2 2.6 3.1 4.7 5.1 6.4 5.2 4.3 4.3 4.7 5.4 4.3 4.5 6.4 2.6 1/17/2010 4.0 3.9 4.0 4.5 4.2 3.8 4.5 6.5 6.3 7.7 6.8 7.2 6.1 5.9 5.0 5.8 6.2 5.7 6.1 6.4 7.2 6.2 6.6 6.8 5.7 7.7 3.8 1/18/2010 5.4 5.5 6.3 5.2 5.3 6.2 6.2 5.4 4.3 5.2 6.8 8.8 10.0 10.7 8.4 10.4 8.9 9.8 9.0 8.6 7.7 4.9 3.5 4.4 7.0 10.7 3.5 1/19/2010 4.0 4.3 4.7 5.3 5.8 7.1 8.7 8.5 9.5 10.5 12.3 10.6 8.4 6.4 5.3 7.8 10.4 7.2 2.6 2.5 4.0 3.8 3.8 2.0 6.5 12.3 2.0 1/20/2010 3.2 4.2 5.1 6.1 7.0 8.6 8.6 8.6 9.3 9.1 9.1 10.4 10.9 9.3 7.8 13.0 12.8 12.6 11.2 11.1 10.8 9.0 10.9 7.7 9.0 13.0 3.2 1/21/2010 3.0 3.8 3.8 3.8 4.5 3.5 5.9 8.0 7.7 7.3 7.0 6.0 4.9 4.6 4.9 3.7 3.8 2.7 2.0 2.4 4.3 3.6 6.6 6.6 4.8 8.0 2.0 1/22/2010 6.3 5.6 6.5 6.8 5.5 6.1 6.2 4.8 5.2 1.1 0.8 0.9 2.2 2.4 1.0 0.8 2.2 3.4 3.0 2.9 3.2 3.1 1.4 1.3 3.4 6.8 0.8 1/23/2010 2.4 2.0 1.5 0.8 0.9 1.7 2.4 1.2 0.6 0.9 1.4 2.2 2.2 2.8 1.9 1.4 0.5 0.9 1.6 1.7 0.8 0.5 0.6 1.6 1.4 2.8 0.5 1/24/2010 2.8 2.8 2.8 3.4 3.9 3.8 3.9 3.2 0.9 0.8 1.1 1.0 0.8 0.5 3.0 4.0 3.9 3.4 1.5 0.6 0.4 1.5 0.4 0.8 2.1 4.0 0.4 1/25/2010 1.4 0.6 0.3 0.6 0.9 1.9 0.8 1.9 2.6 1.5 0.8 2.9 5.0 4.4 3.9 3.8 7.2 7.8 7.7 7.6 8.2 6.2 5.8 7.0 3.8 8.2 0.3 1/26/2010 7.0 5.2 5.6 4.1 3.0 4.0 5.7 4.8 0.9 0.9 1.1 0.7 1.2 1.5 3.3 1.9 1.4 1.8 1.6 2.4 1.8 1.9 1.7 5.0 2.9 7.0 0.7 1/27/2010 4.9 2.1 0.8 0.6 0.4 0.6 0.5 0.8 1.3 1.3 1.5 2.6 2.9 2.7 1.8 1.8 1.4 1.1 1.0 0.4 0.6 0.9 0.7 0.3 1.4 4.9 0.3 1/28/2010 0.1 0.5 1.0 1.1 0.9 0.4 0.5 0.6 1.2 0.9 0.7 0.8 0.9 0.9 0.7 0.5 0.5 1.0 1.7 1.0 0.8 0.8 0.6 0.7 0.8 1.7 0.1 1/29/2010 0.5 0.5 1.4 2.5 1.7 0.7 0.4 0.3 0.6 0.8 0.7 0.8 1.0 1.3 0.6 0.5 0.7 1.2 4.0 6.9 6.1 4.7 4.6 6.9 2.1 6.9 0.3 1/30/2010 3.6 4.4 3.3 3.6 5.8 6.2 3.5 4.1 4.0 4.8 3.8 1.6 0.7 0.4 0.8 0.6 0.6 0.9 1.2 1.0 0.9 0.5 1.1 1.5 2.5 6.2 0.4 1/31/2010 2.4 2.4 1.7 1.4 1.9 0.8 1.3 1.6 0.5 0.6 1.3 1.5 1.2

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 1.4 2.4 0.5 2/1/2010

‐‐ ‐‐ ‐‐ ‐‐ 1.4 1.1 1.7 1.1 0.9 0.9 1.0 1.6 2.2 2.0 3.3 2.7 5.2 5.4 4.9 6.2 6.3 4.3 2.8 1.4 2.8 6.3 0.9 2/2/2010 3.1 3.6 3.6 3.4 1.7 2.2 3.3 2.3 1.3 0.9 0.9 3.5 4.4 4.5 4.2 2.2 3.7 4.2 3.1 2.9 2.2 4.0 2.3 2.9 2.9 4.5 0.9 2/3/2010 4.0 3.0 3.4 4.3 3.7 2.2 2.5 2.7 1.3 1.0 0.7 0.9 0.9 1.8 2.2 0.9 1.0 2.5 3.4 3.1 3.5 3.5 3.6 3.7 2.5 4.3 0.7 2/4/2010 3.0 2.5 2.0 0.9 0.7 0.6 0.6 0.6 1.3 1.7 3.0 5.5 4.9 5.3 4.7 5.8 6.8 7.7 8.0 7.3 8.1 7.1 5.6 5.8 4.1 8.1 0.6 2/5/2010 6.4 6.7 6.8 7.3 8.2 7.8 6.7 6.5 7.0 7.2 7.3 7.1 6.6 5.4 6.1 6.5 7.1 7.3 6.2 5.8 5.7 4.0 4.1 5.6 6.5 8.2 4.0 2/6/2010 5.1 4.6 3.8 4.4 4.8 4.3 5.6 6.5 6.4 4.5 3.7 4.0 5.6 5.6 3.7 1.7 4.2 4.3 3.3 2.3 0.4 0.4 0.4 0.7 3.8 6.5 0.4 2/7/2010 0.9 0.9 1.1 1.2 1.2 1.7 1.0 1.7 2.2 2.9 3.2 2.8 2.7 3.0 1.8 1.8 1.2 1.2 0.8 0.7 1.5 0.6 1.7 1.4 1.6 3.2 0.6 2/8/2010 0.6 0.6 0.6 0.3 0.4 0.2 0.2 0.6 0.7 0.8 1.0 0.7 0.7 0.7 0.4 0.7 3.1 3.8 3.0 3.4 2.9 4.4 4.1 3.1 1.5 4.4 0.2 2/9/2010 3.2 2.2 2.2 3.2 2.8 4.0 4.7 3.8 3.8 3.9 4.1 5.1 4.8 4.4 4.3 4.2 4.1 4.5 4.7 4.3 3.1 2.2 1.7 2.4 3.7 5.1 1.7 2/10/2010 3.0 3.3 2.7 2.2 2.7 2.0 1.6 0.5 0.5 0.9 0.8 0.8 1.1 0.6 1.3 1.0 1.5 2.9 3.7 3.2 2.9 1.3 0.9 0.7 1.8 3.7 0.5 2/11/2010 0.7 0.6 1.1 0.5 0.6 0.6 0.3 0.5 0.7 0.6 1.1 0.8 0.7 0.6 0.6 1.2 3.7 4.8 5.1 4.6 4.5 5.0 4.7 1.9 1.9 5.1 0.3 2/12/2010 2.1 0.8 1.1 1.2 1.0 2.3 2.1 0.5 0.7 1.2 0.8 1.2 1.4 1.2 1.1 0.7 1.5 1.0 1.5 2.3 2.0 2.3 2.3 1.8 1.4 2.3 0.5 2/13/2010 2.0 2.2 2.5 2.7 2.7 2.0 2.8 1.4 0.7 1.4 2.0 2.5 2.1 1.8 1.1 0.7 0.7 2.2 1.8 1.9 3.4 3.6 2.8 2.5 2.1 3.6 0.7 2/14/2010 3.3 2.9 2.2 3.4 4.0 3.7 3.1 0.7 0.5 0.8 0.9 0.7 0.6 0.5 0.7 0.7 3.4 3.8 3.9 3.1 2.1 1.8 2.8 2.2 2.1 4.0 0.5 2/15/2010 1.8 1.8 0.8 1.5 0.8 1.6 0.6 0.3 1.1 1.5 1.3 1.6 1.1 0.9 1.0 0.9 0.6 1.9 2.8 3.4 3.9 3.6 3.1 3.5 1.7 3.9 0.3 SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: WS_ms_10m Month: 12/09/2009 ‐ 04/11/2010 Hour of dayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: WS_ms_10m Month: 12/09/2009 ‐ 04/11/2010 Hour of day 2/16/2010 3.2 3.7 3.2 3.1 3.4 3.4 2.9 1.1 0.8 0.8 0.8 1.0 0.7 0.9 1.0 1.0 0.5 0.3 0.6 0.7 0.9 2.4 1.9 2.2 1.7 3.7 0.3 2/17/2010 2.9 3.0 2.7 2.9 2.8 2.8 2.2 0.9 0.4 0.7 1.0 1.1 1.0 1.1 1.1 1.2 2.1 3.3 3.6 3.9 3.8 3.6 4.1 3.0 2.3 4.1 0.4 2/18/2010 1.9 2.5 1.7 2.4 3.0 3.1 1.3 1.3 1.3 1.1 1.0 1.3 1.6 0.9 1.4 1.5 0.6 0.5 2.0 3.1 3.3 2.6 1.9 1.1 1.8 3.3 0.5 2/19/2010 1.5 1.8 1.0 0.6 0.6 0.2 0.4 0.4 0.8 1.0 2.0 2.5 1.6 1.5 1.1 1.2 0.3 0.4 0.3 0.5 0.4 0.6 1.6 1.9 1.0 2.5 0.2 2/20/2010 1.7 1.0 1.4 1.3 1.6 1.4 1.5 0.9 1.1 1.9 2.1 2.0 2.6 3.2 2.3 1.4 1.0 0.8 1.2 0.9 0.4 0.5 0.2 0.3 1.4 3.2 0.2 2/21/2010 0.2 0.5 0.7 1.6 1.2 0.6 0.7 1.0 1.3 0.8 1.0 1.2 1.4 1.8 1.2 0.6 0.6 0.6 0.6 0.7 0.5 0.9 1.0 1.0 0.9 1.8 0.2 2/22/2010 1.1 0.8 0.6 0.6 0.4 0.7 1.0 0.8 0.8 1.3 1.7 1.4 1.9 2.4 2.3 1.8 0.8 0.6 1.9 1.8 1.4 2.4 2.9 3.5 1.5 3.5 0.4 2/23/2010 3.7 3.8 3.7 3.6 3.6 1.1 1.2 0.6 0.7 1.0 1.9 5.2 5.5 6.1 6.2 6.8 5.9 5.2 5.8 4.5 4.2 5.6 6.9 5.1 4.1 6.9 0.6 2/24/2010 5.2 5.4 5.6 7.6 7.1 6.3 3.0 1.1 1.3 2.6 5.5 3.2 1.8 1.4 1.7 2.3 2.0 0.8 1.2 0.9 2.1 1.0 1.0 0.6 2.9 7.6 0.6 2/25/2010 1.2 1.3 0.6 0.3 0.2 0.4 0.9 0.5 1.1 1.2 1.2 1.2 1.1 3.0 1.3 0.6 1.7 3.3 3.6 4.0 4.1 4.2 4.2 4.4 1.9 4.4 0.2 2/26/2010 4.5 5.2 5.7 4.5 7.3 9.0 10.0 8.9 7.3 8.9 10.2 10.1 7.0 6.9 6.1 3.0 2.5 2.3 5.8 6.8 6.2 7.3 7.9 7.6 6.7 10.2 2.3 2/27/2010 7.2 7.0 6.0 4.3 6.1 5.4 8.5 5.2 6.8 7.7 7.5 6.6 5.8 5.0 4.2 3.1 2.1 2.4 2.2 0.4 0.0 0.5 0.6 1.0 4.4 8.5 0.0 2/28/2010 0.8 1.4 0.6 0.9 1.4 1.2 0.8 1.5 1.4 2.3 2.8 2.6 2.6 3.2 3.1 2.6 1.8 1.3 1.1 0.6 0.5 1.6 2.5 2.8 1.7 3.2 0.5 3/1/2010 3.1 4.0 4.0 3.7 3.0 3.3 2.8 1.5 3.8 2.9 3.9 4.9 5.6 4.8 4.8 4.8 4.8 6.3 5.1 4.9 4.9 4.3 3.7 3.0 4.1 6.3 1.5 3/2/2010 3.4 3.2 2.3 4.4 2.5 3.4 3.5 3.1 2.4 2.8 5.1 6.6 7.3 7.5 6.7 6.3 6.7 6.7 5.3 1.7 1.4 1.7 3.6 3.7 4.2 7.5 1.4 3/3/2010 2.2 4.1 2.5 3.4 3.8 3.9 4.3 4.2 4.6 7.9 9.7 8.5 6.2 4.8 5.5 4.3 2.7 2.6 7.5 8.0 9.8 8.6 8.4 11.6 5.8 11.6 2.2 3/4/2010 13.0 9.9 5.4 4.4 1.7 1.7 3.5 5.0 4.6 5.2 5.2 4.8 6.7 7.1 7.0 6.0 6.7 6.5 6.2 4.9 2.8 1.5 1.8 1.7 5.1 13.0 1.5 3/5/2010 2.8 1.6 1.1 0.7 0.2 0.0 0.4 0.2 0.9 0.8 2.5 5.3 3.6 3.6 4.2 3.6 4.8 3.1 2.8 3.7 5.6 7.2 9.1 7.9 3.2 9.1 0.0 3/6/2010 5.5 8.1 9.9 7.9 7.1 5.4 3.5 4.6 5.6 5.3 6.9 8.2 6.8 5.5 5.4 4.6 4.2 3.0 2.1 1.5 3.3 5.1 4.2 3.5 5.3 9.9 1.5 3/7/2010 2.5 0.8 2.5 2.3 1.1 0.3 0.1 0.6 0.4 0.9 0.7 0.9 2.2 2.4 1.3 1.4 1.9 2.6 3.4 4.3 3.3 3.1 3.6 2.8 1.9 4.3 0.1 3/8/2010 1.6 2.7 3.2 3.9 4.1 2.1 1.5 2.2 1.5 1.4 1.0 3.7 5.7 6.0 5.9 6.1 5.2 2.7 1.5 4.9 4.1 4.6 4.3 5.8 3.6 6.1 1.0 3/9/2010 7.5 6.5 5.1 5.9 3.9 3.7 4.2 3.5 2.7 3.7 3.8 3.3 3.4 1.7 1.4 1.3 1.8 1.5 0.4 0.3 0.9 1.1 0.9 0.7 2.9 7.5 0.3 3/10/2010 1.3 2.4 1.1 0.5 0.6 0.6 0.7 1.3 0.7 1.2 1.1 1.7 1.8 1.7 1.8 1.7 1.2 1.5 1.5 2.1 1.6 1.8 1.9 1.1 1.4 2.4 0.5 3/11/2010 1.2 0.8 1.3 2.3 3.0 3.0 2.4 1.5 1.0 1.0 0.7 0.8 0.6 0.7 0.6 1.0 2.4 3.5 4.1 4.3 4.6 3.0 0.7 0.6 1.9 4.6 0.6 3/12/2010 0.6 1.3 0.7 0.9 1.1 0.9 1.1 4.1 4.6 1.5 1.7 5.9 5.1 5.8 7.0 6.9 6.9 5.6 6.0 4.0 6.1 6.3 8.1 6.6 4.1 8.1 0.6 3/13/2010 1.6 3.9 6.2 5.6 3.8 5.6 3.8 3.3 3.8 6.2 4.5 3.6 3.7 3.4 3.9 3.3 3.8 1.9 2.5 1.9 1.8 1.5 1.6 1.4 3.4 6.2 1.4 3/14/2010 1.8

‐‐ ‐‐ 0.7 0.3 0.9 1.3 1.3 1.3 1.7 1.8 1.5 1.6 1.6 1.4 1.2 0.7 0.6 2.6 3.4 3.7 4.1 3.9 3.4 1.9 4.1 0.3 3/15/2010 3.6 3.4 3.2 2.8 2.1 1.7 0.6 0.5 0.7 1.4 1.4 2.2 3.9 4.1 3.8 4.0 1.8 2.1 1.2 1.9 4.2 3.0 3.8 3.7 2.6 4.2 0.5 3/16/2010 3.4 4.1 3.5 3.0 4.0 3.8 4.3 4.2 5.3 6.1 5.7 5.7 5.3 3.5 3.2 3.5 4.2 5.0 5.1 4.3 3.6 3.1 3.7 2.4 4.2 6.1 2.4 3/17/2010 2.7 2.4 3.2 2.7 1.9 1.8 0.4 0.5 0.7 0.8 0.9 1.6 3.2 2.6 1.9 1.8 1.9 3.1 3.0 4.0 3.9 3.5 2.7 3.5 2.3 4.0 0.4 3/18/2010 4.3 4.1 3.6 2.7 1.8 2.0 1.2 1.7 1.7 2.3 2.8 1.7 2.4 3.5 3.4 3.8 2.3 1.4 1.5 1.3 1.1 1.1 0.8 1.0 2.2 4.3 0.8 3/19/2010 1.3 0.6 0.5 0.3 0.5 0.4 1.1 1.3 1.6 2.0 2.4 2.4 2.4 2.3 2.2 1.8 1.4 0.8 0.8 1.6 1.9 1.3 2.0 2.0 1.4 2.4 0.3 3/20/2010 3.2 3.6 3.3 3.8 4.0 3.8 3.8 2.3 1.0 1.4 3.6 4.5 4.4 2.0 1.4 2.6 4.1 5.6 6.5 6.3 6.4 5.6 4.5 5.3 3.9 6.5 1.0 3/21/2010 6.1 4.5 4.2 3.9 4.5 4.6 3.8 3.6 3.3 1.5 3.7 3.2 1.4 3.5 1.6 0.7 1.6 3.6 3.5 2.7 2.2 1.6 1.2 2.0 3.0 6.1 0.7 3/22/2010 1.2 1.3 1.4 2.5 1.7 1.5 1.8 2.1 2.9 2.9 3.1 3.9 4.1 3.3 3.6 2.4 2.1 1.9 1.5 1.1 1.3 1.9 2.2 1.2 2.2 4.1 1.1 3/23/2010 1.5 1.0 0.7 0.8 0.3 0.4 0.7 1.3 1.1 1.4 2.0 1.9 2.2 2.2 2.4 2.1 1.4 0.4 0.9 2.4 2.8 2.9 3.8 3.8 1.7 3.8 0.3 3/24/2010 3.0 2.9 3.4 3.3 3.2 3.1 1.0 0.9 2.3 3.5 3.5 4.5 5.4 5.1 5.2 5.5 6.2 6.6 6.7 7.2 7.5 7.9 8.0 8.0 4.7 8.0 0.9 3/25/2010 7.4 5.0 6.2 6.2 3.6 1.6 0.8 4.4 4.0 4.7 5.6 5.2 4.2 4.8 3.2 3.0 2.7 1.8 1.9 2.2 2.2 4.3 2.8 1.4 3.7 7.4 0.8 3/26/2010 1.9 1.8 2.8 2.8 3.1 4.4 5.1 4.1 3.9 3.0 3.6 4.0 4.9 5.7 6.4 6.1 4.6 2.3 3.1 2.0 2.2 2.4 1.3 0.8 3.4 6.4 0.8 3/27/2010 0.6 0.8 1.2 1.6 1.7 1.7 0.9 0.7 0.9 1.1 1.2 1.7 2.1 3.1 2.9 2.5 1.9 3.1 3.7 4.5 5.7 5.6 5.2 5.9 2.5 5.9 0.6 3/28/2010 5.5 5.3 4.3 6.1 4.9 6.8 6.7 5.6 5.7 6.5 6.7 6.4 5.6 5.3 5.7 5.2 6.0 5.4 5.0 6.0 5.5 5.7 6.0 6.4 5.8 6.8 4.3 3/29/2010 5.9 5.4 6.3 6.9 5.2 0.8 4.3 5.0 4.9 6.4 7.0 6.5 5.7 4.7 5.7 6.8 7.0 6.1 5.9 7.4 7.4 7.6 8.2 7.3 6.0 8.2 0.8 3/30/2010 7.1 7.4 6.1 4.6 7.0 7.8 7.3 6.8 7.2 8.1 8.7 8.9 6.4 4.7 5.4 5.8 5.9 5.1 5.2 3.1 0.8 0.7 0.6 0.7 5.5 8.9 0.6 3/31/2010 0.9 0.7 0.9 0.4 0.3 1.0 2.2 2.7 2.2 2.0 1.8 1.7 1.1 1.0 0.7 1.0 0.5 0.6 0.2 0.7 0.7 0.6 0.6 0.3 1.0 2.7 0.2 4/1/2010 0.5 0.7 0.9 0.7 0.9 0.9 0.6 0.7 0.9 2.1 2.3 1.6 2.1 2.7 1.7 2.4 1.8 1.6 0.8 0.4 1.5 0.8 0.5 0.5 1.2 2.7 0.4 4/2/2010 0.9 0.7 1.9 3.5 2.7 3.0 3.0 3.9 5.9 6.4 6.2 7.2 7.9 6.7 7.7 7.5 5.8 2.8 2.6 4.1 3.1 5.1 6.4 5.6 4.6 7.9 0.7 4/3/2010 4.6 1.7 1.8 2.2 2.9 1.6 1.2 0.9 0.9 1.3 1.0 1.3 3.4 2.7 1.8 2.2 2.4 2.4 3.0 1.2 0.9 0.5 1.9 2.1 1.9 4.6 0.5 4/4/2010 2.8 3.3 3.5 3.0 3.4 5.5 5.5 6.7 6.4 6.5 7.0 7.0 6.3 6.0 5.3 4.4 4.0 3.9 4.8 4.0 3.3 1.1 1.6 3.2 4.5 7.0 1.1 4/5/2010 5.6 5.3 4.8 4.8 4.1 4.0 3.0 2.8 4.7 3.0 1.6 1.9 4.6 6.0 5.3 4.3 2.0 1.3 1.6 0.7 1.7 1.3 1.3 1.9 3.2 6.0 0.7 4/6/2010 2.0 2.3 2.2 0.7 0.6 1.1 3.0 5.1 4.3 3.3 2.6 1.6 2.0 2.6 2.8 2.7 2.0 1.0 1.2 0.7 1.1 1.0 1.0 1.2 2.0 5.1 0.6 4/7/2010 2.5 2.8 2.9 3.5 2.9 1.9 0.7 0.8 0.8 0.9 0.9 0.8 0.8 0.9 0.7 0.6 0.7 2.9 3.6 2.9 4.2 4.8 4.1 3.8 2.1 4.8 0.6 4/8/2010 3.5 3.4 3.0 2.8 4.1 4.2 4.6 4.5 3.5 1.6 1.3 2.4 3.4 2.9 3.5 3.6 2.5 1.0 1.1 1.1 1.1 1.1 0.5 0.6 2.6 4.6 0.5 4/9/2010 1.2 0.6 0.9 0.5 0.9 1.2 0.7 1.1 1.3 1.0 1.2 1.3 1.3 1.8 1.7 1.6 2.0 0.7 0.7 1.0 1.7 1.9 1.1 0.6 1.2 2.0 0.5 4/10/2010 1.0 1.1 1.2 6.3 5.9 5.0 4.5 6.7 7.6 6.3 6.8 6.8 6.1 6.1 5.5 5.4 4.1 3.9 5.3 6.7 6.6 5.7 6.1 5.7 5.3 7.6 1.0 4/11/2010 6.8 9.2 10.3 11.1 11.0 10.0 11.7 10.9 10.3 8.8 9.2 8.9 9.6 9.5 10.1 10.3 9.1 8.5 8.3 8.3 7.4 7.5 7.1 9.0 9.3 11.7 6.8

Avg 3.1 3.1 3.0 2.9 2.8 2.8 2.8 2.7 2.6 2.7 2.9 3.2 3.2 3.2 3.1 3.1 3.2 3.3 3.4 3.4 3.4 3.3 3.2 3.3 3.1 ‐‐ ‐‐ Max 13.0 10.7 10.5 11.1 11.0 10.2 11.7 10.9 10.3 10.5 12.3 10.6 10.9 10.7 10.1 13.0 12.8 12.6 11.2 11.1 10.8 9.4 10.9 11.6 ‐‐ 13.0 ‐‐ Min 0.1 0.1 0.3 0.0 0.1 0.0 0.0 0.0 0.0 0.1 0.4 0.5 0.4 0.1 0.0 0.1 0.0 0.1 0.0 0.1 0.0 0.2 0.0 0.2 ‐‐ ‐‐ 0.0

‐‐ Indicates invalid data. Wind data from December 9, 2009, through January 6, 2010, and from March 2, 2010, through March 9, 2010, were obtained from the collocated Ruby Hill meteorological station.Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Max Min 12/9/2009 242 209 241 232 177 202 175 157 173 37 47 31 3 17 322 27 166 166 165 164 166 165 165 168 322 3 12/10/2009 169 155 185 157 158 163 170 167 174 45 354 17 28 26 30 155 162 166 165 163 164 182 151 171 354 17 12/11/2009 149 293 313 283 312 294 357 300 164 158 153 150 142 148 151 158 156 164 161 152 152 154 163 161 357 142 12/12/2009 160 159 156 156 156 160 158 159 156 155 157 152 151 147 157 148 143 138 175 156 169 172 150 202 202 138 12/13/2009 309 53 327 360 245 258 228 238 27 274 302 273 261 275 283 286 301 277 0 90 155 238 184 200 360 0 12/14/2009 192 200 259 68 163 170 165 170 299 27 37 46 354 66 79 123 168 169 167 165 171 178 167 163 354 27 12/15/2009 158 159 172 168 156 157 157 156 156 160 163 165 156 160 166 164 159 167 184 43 143 154 155 158 184 43 12/16/2009 219 275 235 177 197 158 172 222 288 324 7 24 333 324 295 357 165 158 163 165 165 170 172 164 357 7 12/17/2009 165 165 162 160 169 178 160 165 250 342 340 7 17 329 343 314 157 170 153 165 168 164 173 165 343 7 12/18/2009 171 165 164 166 161 155 163 163 132 337 22 4 348 330 307 306 163 165 168 166 165 166 166 167 348 4 12/19/2009 165 165 166 171 156 163 168 165 308 30 311 15 324 27 0 307 187 145 235 123 163 159 164 165 324 0 12/20/2009 167 300 229 27 304 140 135 297 359 353 319 309 314 226 158 175 171 182 176 177 173 253 150 165 359 27 12/21/2009 191 135 193 187 151 162 162 159 315 138 303 312 311 141 158 162 155 156 156 152 152 148 149 151 315 135 12/22/2009 156 349 322 157 310 12 281 303 303 352 360 2 355 329 336 330 327 347 328 323 313 318 320 344 360 2 12/23/2009 325 327 330 329 306 308 314 318 314 313 331 7 359 334 337 304 310 304 293 286 290 282 293 301 359 7 12/24/2009 273 273 311 342 283 333 197 171 221 346 24 24 38 24 348 354 161 163 164 167 164 152 173 166 354 24 12/25/2009 165 163 155 152 157 155 166 162 172 23 27 335 351 340 20 0 277 194 164 165 167 165 169 163 351 0 12/26/2009 167 165 166 169 160 265 293 152 133 121 204 166 326 150 159 168 178 199 178 189 183 226 338 314 338 121 12/27/2009 296 290 166 161 171 141 175 203 141 5 346 11 329 1 41 134 157 167 178 213 224 161 170 162 346 1 12/28/2009 169 275 271 301 249 282 170 193 328 346 320 340 4 2 1 176 164 177 335 166 147 153 164 219 346 1 12/29/2009 233 152 185 335 321 309 0 0 0 8 35 326 313 308 320 318 287 166 167 169 179 211 269 153 335 0 12/30/2009 191 284 257 282 197 169 187 243 299 326 321 309 340 333 310 340 347 351 208 175 307 161 164 166 351 161 12/31/2009 166 162 166 165 164 164 184 196 271 5 349 330 309 1 130 160 116 169 97 202 24 179 88 168 349 1 1/1/2010 190 177 133 185 268 293 73 148 165 204 345 102 248 43 183 154 173 165 188 168 165 172 165 166 345 43 1/2/2010 167 167 164 169 176 162 166 166 173 312 39 19 60 67 72 207 163 165 165 166 167 167 165 163 312 19 1/3/2010 167 177 170 168 164 154 169 152 174 326 17 40 42 29 27 331 210 295 302 337 319 272 158 300 337 17 1/4/2010 1 148 311 76 25 285 80 111 17 27 3 15 17 360 35 4 164 152 164 163 159 169 174 161 360 1 1/5/2010 184 162 167 159 162 164 174 216 172 150 348 335 29 81 145 57 204 160 167 244 158 163 160 167 348 29 1/6/2010 167 173 170 161 164 166 167 163 151 353 13 25 19 311 322 188 44 175 167 164 295 15 288 285 353 13 1/7/2010 358 300 261 321 335 48 49 310 338 309 356 3 8 17 359 174 150 161 168 163 153 152 155 155 359 3 1/8/2010 154 156 154 156 41 116 143 325 353 3 8 7 5 240 244 95 309 161 131 179 216 232 148 169 353 3 1/9/2010 313 244 173 179 161 137 154 92 2 21 16 14 83 296 16 279 165 158 193 188 167 302 186 321 321 2 1/10/2010 125 181 157 181 169 171 304 161 82 3 348 17 45 31 3 51 172 170 155 161 156 152 156 148 348 3 1/11/2010 157 160 153 165 167 248 116 141 309 327 312 340 215 141 148 161 150 145 142 134 147 146 152 159 340 116 1/12/2010 160 141 135 153 147 138 132 147 147 135 132 149 156 150 131 141 145 151 140 141 137 141 145 148 160 131 1/13/2010 145 143 144 153 152 143 138 151 172 352 346 312 302 312 304 304 300 304 302 302 303 305 309 303 352 138 1/14/2010 300 297 318 349 326 325 335 6 38 7 359 9 25 358 1 298 162 156 154 155 154 155 155 159 359 1 1/15/2010 156 163 160 166 167 85 175 332 108 333 16 342 316 78 156 156 161 170 181 188 186 184 181 161 342 16 1/16/2010 151 176 164 156 171 160 183 160 152 179 157 186 191 193 177 150 148 140 147 163 164 163 154 162 193 140 1/17/2010 173 175 174 167 179 178 173 150 158 148 148 150 161 166 161 153 137 134 137 147 148 148 147 154 179 134 1/18/2010 149 152 147 145 145 147 156 166 172 160 145 145 138 140 150 149 158 161 159 168 179 221 227 213 227 138 1/19/2010 198 203 155 147 149 151 151 150 151 152 157 155 158 148 155 167 169 146 127 153 154 157 152 165 203 127 1/20/2010 166 160 150 150 150 144 141 139 142 139 137 152 154 160 163 164 159 155 165 165 165 170 174 182 182 137 1/21/2010 146 154 166 161 146 147 147 148 148 150 148 155 132 104 112 123 111 92 100 96 115 144 161 172 172 92 1/22/2010 170 168 162 159 155 159 166 163 166 39 60 68 290 283 311 303 151 151 156 156 161 157 164 141 311 39 1/23/2010 159 155 147 141 142 154 158 175 347 351 344 318 319 302 329 319 328 299 279 280 249 246 138 151 351 138 1/24/2010 157 158 155 156 155 154 153 150 52 25 27 341 13 61 143 158 163 168 239 83 79 154 56 105 341 13 1/25/2010 212 335 169 8 203 151 254 152 151 152 3 127 149 165 141 170 146 152 155 146 150 147 145 139 335 3 1/26/2010 155 157 156 164 156 180 160 149 62 24 350 82 290 121 157 188 172 164 171 171 173 179 193 155 350 24 1/27/2010 154 232 277 195 260 253 241 336 301 329 341 354 354 349 0 358 355 358 357 29 147 227 293 41 358 0 1/28/2010 32 344 327 314 347 78 23 1 353 328 34 349 8 5 42 347 195 175 148 149 288 147 137 336 353 1 1/29/2010 0 87 148 157 159 221 100 132 77 357 3 30 342 315 352 141 152 275 148 149 164 178 176 163 357 0 1/30/2010 189 191 218 184 165 157 168 148 155 155 162 288 353 41 58 305 359 331 229 222 172 63 171 186 359 41 1/31/2010 160 161 171 175 169 79 194 152 93 345 340 343 342

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 345 79 2/1/2010

‐‐ ‐‐ ‐‐ ‐‐ 180 143 152 330 264 9 1 338 84 256 189 198 149 160 167 152 152 164 198 243 338 1 2/2/2010 171 170 176 177 181 169 169 233 21 340 334 140 150 153 160 149 166 164 188 169 216 152 190 181 340 21 2/3/2010 162 181 171 164 174 181 157 161 320 4 17 57 44 330 305 324 206 153 156 161 158 158 159 163 330 4 2/4/2010 153 156 150 138 330 15 331 5 318 311 170 149 155 152 156 147 148 149 156 154 152 142 148 151 331 5 2/5/2010 151 143 146 147 154 150 151 153 146 147 146 146 145 153 162 156 157 160 166 147 135 146 141 160 166 135 2/6/2010 166 157 144 143 148 150 152 151 150 154 141 140 142 149 152 169 138 148 143 127 57 52 29 327 327 29 2/7/2010 323 315 330 341 345 348 342 358 355 355 356 358 354 359 11 348 347 4 345 330 308 266 300 295 359 4 2/8/2010 232 293 317 83 290 44 147 313 319 15 336 12 47 74 116 170 156 156 152 144 161 169 188 190 336 12 2/9/2010 187 187 174 169 184 166 161 150 140 145 142 152 158 151 151 162 155 160 163 167 176 170 160 166 187 140 2/10/2010 155 178 161 151 155 156 154 319 40 346 54 37 15 42 350 305 193 152 155 156 159 162 168 72 350 15 2/11/2010 309 360 251 153 238 7 49 148 57 100 33 41 103 123 25 91 157 157 153 159 167 167 164 147 360 7 2/12/2010 160 124 160 110 160 159 152 101 73 18 56 29 331 319 320 31 166 203 187 169 164 165 165 163 331 18 2/13/2010 156 156 157 157 157 162 165 153 112 322 313 305 306 333 350 53 100 156 146 157 154 156 156 158 350 53 2/14/2010 156 158 155 153 155 156 155 82 27 25 11 11 33 43 32 125 158 162 168 179 135 169 157 186 186 11 2/15/2010 186 143 184 187 179 156 205 121 18 312 313 309 5 357 348 341 65 153 155 155 159 164 153 156 357 5 SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: WD_10m Month: 12/09/2009 ‐ 04/11/2010 Hour of dayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Max Min SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: WD_10m Month: 12/09/2009 ‐ 04/11/2010 Hour of day 2/16/2010 153 157 158 157 153 158 154 74 13 19 5 355 29 18 10 357 29 203 220 251 202 176 156 163 357 5 2/17/2010 156 157 155 155 155 155 155 115 65 24 15 2 349 345 16 320 174 155 154 154 156 156 157 158 349 2 2/18/2010 156 155 164 156 155 157 317 229 191 156 17 13 8 12 359 346 323 121 156 160 158 152 172 233 359 8 2/19/2010 169 242 321 229 180 211 3 222 153 30 321 305 357 2 3 354 284 181 21 341 266 202 169 160 357 2 2/20/2010 155 160 155 154 155 152 152 151 350 313 326 308 289 303 318 334 6 338 347 16 286 299 75 35 350 6 2/21/2010 54 151 144 166 172 64 346 344 315 335 328 357 3 1 19 342 213 280 343 321 325 337 352 340 357 1 2/22/2010 326 333 336 346 322 214 161 224 12 346 359 358 347 351 1 27 27 108 157 157 161 155 156 154 359 1 2/23/2010 153 154 155 153 167 163 139 118 355 340 59 151 155 149 150 150 156 151 155 165 163 148 146 155 355 59 2/24/2010 154 161 152 147 146 153 211 315 295 175 154 164 6 225 292 264 255 228 251 286 266 248 327 58 327 6 2/25/2010 161 163 208 15 120 182 267 310 328 340 306 313 327 296 27 66 165 160 155 153 157 167 166 161 340 15 2/26/2010 159 156 161 165 143 146 146 147 165 145 151 149 163 149 161 134 123 117 149 146 142 145 142 138 165 117 2/27/2010 129 136 144 142 136 127 143 157 141 145 143 146 145 145 155 154 148 156 161 209 210 334 333 306 334 127 2/28/2010 331 352 3 323 308 344 1 353 337 349 355 2 1 356 354 350 353 342 327 25 276 163 153 155 356 1 3/1/2010 156 155 153 153 152 154 154 147 132 101 139 161 158 168 165 161 158 155 164 154 146 159 169 172 172 101 3/2/2010 153 153 197 176 209 170 151 143 141 151 168 181 180 174 169 174 178 174 200 333 277 161 184 186 333 141 3/3/2010 197 167 179 188 175 170 169 160 176 150 159 154 158 185 184 155 156 180 187 181 176 177 181 182 197 150 3/4/2010 181 182 182 262 238 305 293 290 295 295 294 295 299 294 294 296 301 297 293 296 331 333 41 299 333 41 3/5/2010 290 325 327 179 241 0 264 137 90 114 87 112 169 185 197 176 113 151 150 139 124 114 110 119 327 0 3/6/2010 127 111 107 108 110 103 140 106 123 122 101 108 103 97 93 99 96 136 164 187 146 139 135 162 187 93 3/7/2010 188 169 165 171 179 320 352 285 310 298 346 342 346 17 32 324 291 221 170 167 167 162 164 171 352 17 3/8/2010 158 163 164 162 167 182 155 145 152 342 306 163 163 157 156 158 182 303 351 281 291 299 301 300 351 145 3/9/2010 294 295 302 309 321 321 313 324 341 348 350 357 355 10 10 334 281 280 301 64 235 257 268 244 357 10 3/10/2010 278 282 268 276 270 196 287 301 340 6 355 358 358 357 357 353 329 326 305 305 309 309 309 295 358 6 3/11/2010 269 194 211 155 155 156 155 155 346 347 62 12 38 86 71 135 159 156 159 171 173 190 166 342 347 12 3/12/2010 222 156 269 315 295 235 309 167 165 329 290 155 162 168 168 173 171 162 163 140 152 152 163 166 329 140 3/13/2010 148 171 168 249 304 296 295 312 308 299 312 318 342 326 317 332 348 340 348 358 350 331 325 343 358 148 3/14/2010 349

‐‐ ‐‐ 309 282 295 298 314 334 1 6 3 0 5 5 4 342 72 154 154 154 153 153 154 349 0 3/15/2010 155 152 157 155 154 159 160 107 20 331 336 170 152 154 166 162 134 126 109 141 160 174 176 184 336 20 3/16/2010 193 175 191 206 189 189 165 155 152 148 148 151 152 160 158 166 166 162 161 173 171 164 158 161 206 148 3/17/2010 151 149 151 162 159 169 315 351 332 337 16 207 152 148 153 175 182 154 165 158 159 158 155 154 351 16 3/18/2010 156 154 154 156 167 158 290 324 330 346 344 335 318 353 355 350 342 331 345 323 318 312 333 283 355 154 3/19/2010 303 290 247 203 255 265 311 354 11 351 7 6 3 7 15 18 17 340 231 157 152 155 156 162 354 3 3/20/2010 158 155 155 153 153 155 152 156 288 114 154 151 153 160 127 150 146 149 143 148 150 154 158 158 288 114 3/21/2010 156 172 173 168 164 160 164 153 147 309 171 168 280 159 249 268 212 165 191 239 237 232 201 165 309 147 3/22/2010 164 194 212 163 169 232 276 314 306 299 301 296 298 305 354 12 8 1 2 331 332 329 322 4 354 1 3/23/2010 354 339 4 305 300 112 40 323 350 5 342 350 354 3 9 7 7 353 203 155 157 152 152 156 354 3 3/24/2010 162 159 161 164 148 145 334 328 221 151 145 153 148 149 154 161 164 165 168 163 157 148 140 143 334 140 3/25/2010 168 179 177 172 223 201 70 296 298 299 301 300 298 298 307 310 315 310 329 318 330 299 333 333 333 70 3/26/2010 319 319 303 305 301 298 295 301 305 304 300 295 301 303 301 297 317 313 333 338 329 350 336 348 350 295 3/27/2010 36 297 201 190 161 160 156 20 335 100 105 128 129 166 148 155 162 146 142 148 154 159 158 156 335 20 3/28/2010 153 160 174 151 159 143 143 143 145 144 151 147 169 157 158 166 164 161 164 148 151 153 155 153 174 143 3/29/2010 158 161 155 159 168 265 179 151 145 151 158 163 179 193 174 168 167 168 165 167 168 166 170 176 265 145 3/30/2010 177 173 180 172 170 171 170 209 235 251 259 261 284 300 270 288 299 295 289 293 312 4 10 48 312 4 3/31/2010 349 348 336 57 356 318 353 352 1 24 8 0 11 1 226 270 255 216 95 211 316 308 318 20 356 0 4/1/2010 186 249 268 207 151 154 327 2 350 308 270 318 308 304 40 325 338 356 81 281 272 274 8 181 356 2 4/2/2010 229 173 148 155 152 153 150 143 144 147 160 162 158 162 165 174 215 239 197 215 266 280 285 288 288 143 4/3/2010 298 321 303 307 313 3 23 1 2 328 56 74 135 161 13 331 318 315 320 325 302 22 155 151 331 1 4/4/2010 154 154 152 153 175 149 147 148 146 148 149 150 154 166 178 188 201 206 220 247 251 78 205 185 251 78 4/5/2010 169 165 162 166 172 174 295 299 296 316 323 358 302 292 297 301 312 12 320 78 204 242 264 221 358 12 4/6/2010 201 237 258 187 336 305 293 296 296 336 338 353 351 349 326 337 351 10 338 336 24 328 163 164 353 10 4/7/2010 156 156 154 153 155 154 61 314 22 10 29 338 305 46 65 106 130 153 155 148 159 158 168 180 338 10 4/8/2010 177 186 183 180 175 165 152 145 148 252 155 196 266 258 279 285 312 329 187 100 5 359 31 346 359 5 4/9/2010 316 294 303 314 178 145 21 2 351 14 5 3 11 8 12 13 359 8 317 240 167 194 259 251 359 2 4/10/2010 261 310 299 153 149 157 145 148 152 157 183 191 189 191 187 182 204 190 184 182 177 183 184 181 310 145 4/11/2010 171 173 170 169 165 162 167 170 171 172 170 180 178 173 176 175 175 177 172 166 170 176 181 179 181 162

Max 358 360 336 360 356 348 357 358 359 357 360 358 359 360 359 358 359 358 357 358 350 359 352 348 360 ‐‐ Min 0 53 3 8 25 0 0 0 0 1 1 0 0 1 0 0 6 1 0 16 5 4 8 4 ‐‐ 0

‐‐ Indicates invalid data. Wind data from December 9, 2009, through January 6, 2010, and from March 2, 2010, through March 9, 2010, were obtained from the collocated Ruby Hill meteorological station.Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min 12/9/2009

‐ 15.8 ‐ 16.1 ‐ 15.7 ‐ 16.7 ‐ 16.9 ‐ 16.5 ‐ 16.1 ‐ 16.0 ‐ 12.8 ‐ 8.6 ‐ 7.3 ‐ 6.1 ‐ 6.0 ‐ 5.3 ‐ 5.2 ‐ 6.3 ‐ 10.0 ‐ 13.4 ‐ 14.3 ‐ 14.0 ‐ 13.9 ‐ 13.7 ‐ 13.0 ‐ 13.0 ‐ 12.2 ‐ 5.2 ‐ 16.9 12/10/2009 12/11/2009 12/12/2009

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐ 3.1 ‐ 2.8 ‐ 2.4 ‐ 2.0 ‐ 1.5 ‐ 2.4 ‐ 1.5 ‐ 3.1 12/13/2009 12/14/2009 12/15/2009

‐ 2.9 ‐ 2.8 ‐ 2.8 ‐ 2.9 ‐ 2.5 ‐ 2.6 ‐ 2.5 ‐ 2.2 ‐ 1.8 ‐ 1.3 ‐ 0.8 ‐ 0.6 ‐ 0.3 ‐ 0.3 ‐ 0.6 ‐ 0.2 ‐ 0.1 ‐ 0.1 ‐ 0.4 ‐ 2.2 ‐ 1.4 0.3 0.4 0.5 ‐ 1.3 0.5 ‐ 2.9 12/16/2009 12/17/2009 12/18/2009

‐‐ ‐‐ ‐ 3.1 ‐ 3.3 ‐ 4.6 ‐ 4.7 ‐ 3.7 ‐ 3.1 0.0 2.3 2.9 4.2 4.7 5.0 4.5 3.3 1.2 ‐ 2.2 ‐ 3.0 ‐ 3.3 ‐ 4.0 ‐ 4.3 ‐ 5.0 ‐ 5.3 ‐ 1.0 5.0 ‐ 5.3 12/19/2009 12/20/2009 12/21/2009

‐ 2.1 ‐ 2.5 ‐ 3.3 ‐ 3.4 ‐ 4.7 ‐ 2.3 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐ 0.6 ‐ 0.6 1.3 0.9 0.3 ‐ 0.2 ‐ 0.4 ‐ 0.7 ‐ 0.9 ‐ 1.3 ‐ 1.8 ‐ 2.1 ‐ 2.1 ‐ 1.4 1.3 ‐ 4.7 12/22/2009 12/23/2009 12/24/2009

‐ 11.2 ‐ 10.6 ‐ 10.9 ‐ 11.5 ‐ 11.4 ‐ 11.7 ‐ 12.1 ‐ 11.7 ‐ 8.6 ‐ 5.0 ‐ 3.9 ‐ 2.7 ‐ 2.9 ‐ 2.2 ‐ 2.3 ‐ 3.8 ‐ 7.2 ‐ 10.2 ‐ 10.6 ‐ 10.5 ‐ 10.4 ‐ 10.0 ‐ 10.4 ‐ 10.2 ‐ 8.4 ‐ 2.2 ‐ 12.1 12/25/2009 12/26/2009 12/27/2009

‐ 8.8 ‐ 9.2 ‐ 9.2 ‐ 7.5 ‐ 8.1 ‐ 8.6 ‐ 8.9 ‐ 10.0 ‐ 8.1 ‐ 3.1 ‐ 3.1 ‐ 1.4 ‐ 2.0 ‐ 1.4 ‐ 0.4 ‐ 2.9 ‐ 4.6 ‐ 5.4 ‐ 6.1 ‐ 7.4 ‐ 8.5 ‐ 8.6 ‐ 8.3 ‐ 8.7 ‐ 6.3 ‐ 0.4 ‐ 10.0 12/28/2009 12/29/2009 12/30/2009

‐ 5.1 ‐ 5.2 ‐ 5.5 ‐ 5.8 ‐ 5.8 ‐ 5.9 ‐ 6.0 ‐ 5.4 ‐ 4.5 ‐ 4.4 ‐ 4.1 ‐ 4.8 ‐ 4.8 ‐ 5.1 ‐ 5.2 ‐ 5.0 ‐ 5.7 ‐ 6.3 ‐ 7.3 ‐ 7.6 ‐ 8.0 ‐ 8.2 ‐ 9.8 ‐ 10.6 ‐ 6.1 ‐ 4.1 ‐ 10.6 12/31/2009 1/1/2010 1/2/2010

‐ 3.8 ‐ 3.7 ‐ 3.3 ‐ 2.8 ‐ 3.9 ‐ 4.0 ‐ 4.5 ‐ 5.2 ‐ 3.0 1.2 4.0 4.1 4.9 4.2 3.7 2.2 ‐ 0.3 ‐ 2.8 ‐ 4.2 ‐ 4.7 ‐ 5.8 ‐ 4.8 ‐ 5.2 ‐ 5.9 ‐ 1.8 4.9 ‐ 5.9 1/3/2010 1/4/2010 1/5/2010

‐ 4.9 ‐ 5.2 ‐ 3.5 ‐ 4.3 ‐ 5.6 ‐ 4.1 ‐ 3.4 ‐ 4.1 ‐ 4.0 0.2 2.3 2.0 3.3 5.6 5.1 4.2 2.2 0.7 0.5 0.5 0.3 0.1 ‐ 0.7 ‐ 0.6 ‐ 0.5 5.6 ‐ 5.6 1/6/2010 1/7/2010 1/8/2010

‐ 9.4 ‐ 9.5 ‐ 8.7 ‐ 8.9 ‐ 8.0 ‐ 9.5 ‐ 11.5 ‐ 11.8 ‐ 10.4 ‐ 8.7 ‐ 6.4 ‐ 4.8 ‐ 4.3 ‐ 3.3 ‐ 2.8 ‐ 2.6 ‐ 2.8 ‐ 3.2 ‐ 3.4 ‐ 1.4 ‐ 1.4 ‐ 2.4 ‐ 2.6 ‐ 1.8 ‐ 5.8 ‐ 1.4 ‐ 11.8 1/9/2010 1/10/2010 1/11/2010

‐ 3.0 ‐ 3.5 ‐ 3.0 ‐ 3.0 ‐ 2.4 ‐ 2.7 ‐ 3.5 ‐ 4.1 ‐ 0.4 1.6 2.7 2.5 2.8 3.3 3.9 3.4 2.3 1.7 2.4 3.0 3.0 2.3 1.9 1.8 0.5 3.9 ‐ 4.1 1/12/2010 1/13/2010 1/14/2010

‐ 2.4 ‐ 2.6 ‐ 3.3 ‐ 3.1 ‐ 3.1 ‐ 4.1 ‐ 4.6 ‐ 5.0 ‐ 4.0 ‐ 1.2 ‐ 0.3 0.2 0.8 1.7 1.5 0.9 ‐ 1.2 ‐ 4.0 ‐ 5.8 ‐ 6.3 ‐ 6.8 ‐ 7.4 ‐ 7.2 ‐ 7.3 ‐ 3.1 1.7 ‐ 7.4 1/15/2010 1/16/2010 1/17/2010 0.1

‐ 0.7 ‐ 1.3 ‐ 1.3 ‐ 1.2 ‐ 1.5 ‐ 1.6 ‐ 1.7 ‐ 0.6 0.2 0.3 0.4 0.9 1.5 1.6 1.0 0.4 0.2 0.2 ‐ 0.1 ‐ 0.9 ‐ 1.6 ‐ 2.3 ‐ 2.3 ‐ 0.4 1.6 ‐ 2.3 1/18/2010 1/19/2010 1/20/2010

‐ 4.5 ‐ 5.5 ‐ 6.1 ‐ 5.8 ‐ 5.7 ‐ 6.1 ‐ 6.4 ‐ 6.3 ‐ 6.1 ‐ 6.1 ‐ 5.1 ‐ 4.6 ‐ 4.6 ‐ 4.9 ‐ 4.6 ‐ 4.4 ‐ 4.5 ‐ 4.5 ‐ 4.4 ‐ 4.2 ‐ 4.0 ‐ 3.6 ‐ 3.5 ‐ 3.2 ‐ 4.9 ‐ 3.2 ‐ 6.4 1/21/2010 1/22/2010 1/23/2010

‐ 10.7 ‐ 10.9 ‐ 11.3 ‐ 11.5 ‐ 10.4 ‐ 10.1 ‐ 11.2 ‐ 11.3 ‐ 9.0 ‐ 5.6 ‐ 4.7 ‐ 4.3 ‐ 3.8 ‐ 2.7 ‐ 3.2 ‐ 2.7 ‐ 4.0 ‐ 5.0 ‐ 5.4 ‐ 5.6 ‐ 5.7 ‐ 6.0 ‐ 6.2 ‐ 7.1 ‐ 7.0 ‐ 2.7 ‐ 11.5 1/24/2010 1/25/2010 1/26/2010

‐ 1.4 ‐ 1.5 ‐ 2.0 ‐ 2.1 ‐ 2.3 ‐ 2.8 ‐ 3.5 ‐ 2.6 ‐ 1.5 ‐ 0.5 0.8 0.8 2.8 2.5 3.0 1.0 0.0 ‐ 1.0 ‐ 1.7 ‐ 1.7 ‐ 1.3 ‐ 0.9 ‐ 0.9 ‐ 1.6 ‐ 0.8 3.0 ‐ 3.5 1/27/2010 1/28/2010 1/29/2010

‐ 10.5 ‐ 10.4 ‐ 11.0 ‐ 10.4 ‐ 9.1 ‐ 8.7 ‐ 9.6 ‐ 11.0 ‐ 5.6 ‐ 3.0 ‐ 3.2 ‐ 1.5 ‐ 0.2 ‐ 0.2 ‐ 0.2 ‐ 1.6 ‐ 2.9 ‐ 3.9 ‐ 3.8 ‐ 0.5 ‐ 0.4 ‐ 1.4 ‐ 1.9 ‐ 1.8 ‐ 4.7 ‐ 0.2 ‐ 11.0 1/30/2010 1/31/2010 2/1/2010

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐ 6.5 ‐ 8.9 ‐ 5.9 ‐ 5.9 ‐ 4.3 ‐ 2.2 ‐ 0.3 ‐ 0.4 1.3 0.7 ‐ 0.2 ‐ 0.9 ‐ 0.8 ‐ 1.5 ‐ 1.1 ‐ 1.2 ‐ 1.3 ‐ 1.1 ‐ 1.6 ‐ 2.2 1.3 ‐ 8.9 2/2/2010 2/3/2010 2/4/2010

‐ 5.0 ‐ 6.1 ‐ 6.2 ‐ 6.8 ‐ 5.3 ‐ 4.6 ‐ 4.8 ‐ 4.9 ‐ 2.9 ‐ 1.0 ‐ 1.1 0.8 2.2 3.0 2.4 2.0 1.5 0.7 0.3 ‐ 0.3 ‐ 0.6 ‐ 0.9 ‐ 1.1 ‐ 0.2 ‐ 1.6 3.0 ‐ 6.8 2/5/2010 2/6/2010 2/7/2010

‐ 2.1 ‐ 2.6 ‐ 2.8 ‐ 2.9 ‐ 3.0 ‐ 3.1 ‐ 3.1 ‐ 2.9 ‐ 2.5 ‐ 2.4 ‐ 2.1 ‐ 1.8 ‐ 1.7 ‐ 1.6 ‐ 1.9 ‐ 2.4 ‐ 2.5 ‐ 2.9 ‐ 3.4 ‐ 3.9 ‐ 4.2 ‐ 4.8 ‐ 5.3 ‐ 5.0 ‐ 2.9 ‐ 1.6 ‐ 5.3 2/8/2010 2/9/2010 2/10/2010

‐ 7.8 ‐ 7.6 ‐ 5.3 ‐ 6.4 ‐ 8.5 ‐ 9.3 ‐ 8.7 ‐ 6.9 ‐ 4.6 ‐ 2.2 ‐ 1.2 1.1 1.5 1.8 2.9 0.7 ‐ 1.0 ‐ 2.7 ‐ 5.0 ‐ 5.5 ‐ 5.4 ‐ 5.1 ‐ 4.3 ‐ 4.5 ‐ 3.9 2.9 ‐ 9.3 2/11/2010 2/12/2010 2/13/2010

‐ 0.1 ‐ 1.8 ‐ 3.2 ‐ 3.3 ‐ 3.9 ‐ 4.3 ‐ 3.6 ‐ 2.3 ‐ 0.5 3.8 4.2 4.5 4.6 5.2 5.4 5.6 5.1 2.6 ‐ 0.1 ‐ 0.9 ‐ 1.0 ‐ 2.2 ‐ 2.2 ‐ 2.1 0.4 5.6 ‐ 4.3 2/14/2010 2/15/2010 Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: T_AMB_C Month: 12/09/2009 ‐ 04/11/2010 Hour of day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ DayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: T_AMB_C Month: 12/09/2009 ‐ 04/11/2010 Hour of day 2/16/2010

‐ 1.8 ‐ 2.1 ‐ 2.1 ‐ 1.8 ‐ 2.6 ‐ 3.3 ‐ 3.1 ‐ 2.6 1.4 2.4 3.8 5.6 5.6 7.1 7.2 6.5 5.5 3.5 2.4 1.7 1.1 0.9 0.4 ‐ 1.4 1.4 7.2 ‐ 3.3 2/17/2010 2/18/2010 2/19/2010

‐ 2.9 ‐ 2.5 ‐ 2.0 ‐ 2.7 ‐ 3.3 ‐ 3.1 ‐ 3.0 ‐ 2.8 ‐ 1.7 ‐ 0.5 0.9 1.5 1.7 1.2 0.4 0.8 ‐ 0.6 ‐ 1.7 ‐ 2.4 ‐ 2.9 ‐ 3.0 ‐ 3.7 ‐ 4.7 ‐ 5.6 ‐ 1.8 1.7 ‐ 5.6 2/20/2010 2/21/2010 2/22/2010

‐ 9.1 ‐ 9.6 ‐ 10.3 ‐ 10.8 ‐ 11.3 ‐ 12.4 ‐ 13.2 ‐ 13.0 ‐ 9.8 ‐ 7.6 ‐ 7.5 ‐ 6.4 ‐ 5.1 ‐ 4.6 ‐ 4.1 ‐ 4.1 ‐ 4.3 ‐ 6.1 ‐ 7.4 ‐ 9.1 ‐ 9.2 ‐ 9.3 ‐ 10.2 ‐ 11.2 ‐ 8.6 ‐ 4.1 ‐ 13.2 2/23/2010 2/24/2010 2/25/2010

‐ 4.4 ‐ 4.9 ‐ 5.0 ‐ 5.2 ‐ 4.7 ‐ 4.3 ‐ 3.7 ‐ 2.8 ‐ 0.8 ‐ 0.3 0.2 1.1 1.8 2.3 2.2 2.0 2.2 ‐ 0.2 ‐ 2.0 ‐ 3.4 ‐ 4.5 ‐ 4.3 ‐ 3.5 ‐ 3.3 ‐ 1.9 2.3 ‐ 5.2 2/26/2010 2/27/2010 2/28/2010

‐ 2.2 ‐ 2.2 ‐ 2.3 ‐ 2.4 ‐ 2.4 ‐ 2.3 ‐ 2.3 ‐ 2.2 ‐ 1.9 ‐ 1.4 ‐ 0.3 0.4 1.6 1.8 1.9 1.7 1.5 0.5 ‐ 0.4 ‐ 0.7 ‐ 1.3 ‐ 2.2 ‐ 3.0 ‐ 4.4 ‐ 1.0 1.9 ‐ 4.4 3/1/2010 3/2/2010 3/3/2010

‐ 0.4 ‐ 0.8 ‐ 0.4 ‐ 1.0 ‐ 1.5 ‐ 1.6 ‐ 1.6 ‐ 0.7 0.4 0.8 1.1 2.0 2.9 3.9 4.2 4.4 4.2 3.2 3.0 2.3 1.8 1.2 0.9 0.4 1.2 4.4 ‐ 1.6 3/4/2010 3/5/2010 3/6/2010 0.0

‐ 0.1 ‐ 0.1 0.0 ‐ 0.1 ‐ 0.1 0.0 0.5 0.9 1.9 3.5 4.7 5.4 6.2 5.6 5.4 4.8 3.5 1.9 2.0 2.2 2.3 ‐ 0.1 ‐ 0.9 2.1 6.2 ‐ 0.9 3/7/2010 3/8/2010 3/9/2010

‐ 5.6 ‐ 5.9 ‐ 5.9 ‐ 5.9 ‐ 6.0 ‐ 6.0 ‐ 5.9 ‐ 5.3 ‐ 5.3 ‐ 5.0 ‐ 4.8 ‐ 4.8 ‐ 4.4 ‐ 4.6 ‐ 4.2 ‐ 4.5 ‐ 5.0 ‐ 6.5 ‐ 6.9 ‐ 7.1 ‐ 7.5 ‐ 8.2 ‐ 8.8 ‐ 8.5 ‐ 5.9 ‐ 4.2 ‐ 8.8 3/10/2010 3/11/2010 3/12/2010

‐ 4.3 ‐ 4.7 ‐ 4.5 ‐ 4.3 ‐ 4.5 ‐ 4.7 ‐ 3.1 ‐ 1.7 1.0 2.2 2.9 3.1 4.5 4.4 5.0 4.7 4.1 3.7 3.0 3.1 2.2 2.3 1.7 2.1 0.7 5.0 ‐ 4.7 3/13/2010 3/14/2010 3/15/2010

‐ 8.2 ‐ 8.2 ‐ 8.4 ‐ 8.0 ‐ 7.9 ‐ 8.4 ‐ 8.0 ‐ 4.1 0.1 1.8 2.3 5.0 7.0 6.7 7.2 7.4 7.2 5.9 3.6 2.3 2.4 3.6 3.3 2.5 0.3 7.4 ‐ 8.4 3/16/2010 3/17/2010 3/18/2010 1.8 1.8 1.7 1.2 0.7

‐ 0.5 ‐ 0.3 2.2 2.3 1.8 2.2 0.8 1.2 3.0 4.2 4.8 4.7 3.0 0.7 ‐ 0.6 ‐ 1.4 ‐ 2.0 ‐ 2.6 ‐ 3.1 1.2 4.8 ‐ 3.1 3/19/2010 3/20/2010 3/21/2010 5.1 5.1 4.4 4.3 3.8 3.6 4.0 4.5 6.5 8.1 8.4 9.7 10.2 11.8 11.0 12.0 11.0 10.1 6.5 7.6 7.0 5.8 5.0 3.6 7.0 12.0 3.6 3/22/2010 3/23/2010 3/24/2010

‐ 3.6 ‐ 3.6 ‐ 4.1 ‐ 4.5 ‐ 4.5 ‐ 4.7 ‐ 3.5 ‐ 0.4 2.4 3.7 5.4 6.8 7.7 8.3 8.8 8.8 8.2 6.8 5.9 5.1 4.0 3.1 3.1 2.7 2.6 8.8 ‐ 4.7 3/25/2010 3/26/2010 3/27/2010

‐ 6.7 ‐ 7.3 ‐ 8.0 ‐ 8.3 ‐ 8.3 ‐ 8.5 ‐ 7.7 ‐ 4.0 ‐ 1.6 ‐ 0.4 2.1 3.9 5.1 6.5 6.3 6.3 6.2 5.0 1.9 0.9 0.5 1.4 1.6 0.7 ‐ 0.5 6.5 ‐ 8.5 3/28/2010 3/29/2010 3/30/2010 7.0 7.0 6.9 6.5 6.2 5.6 5.6 5.8 9.1 11.2 12.1 12.4 12.8 10.7 10.1 11.3 10.0 6.7 3.2 0.3

‐ 0.2 ‐ 1.0 ‐ 1.2 ‐ 1.6 6.5 12.8 ‐ 1.6 3/31/2010 4/1/2010 4/2/2010

‐ 6.4 ‐ 7.2 ‐ 7.4 ‐ 9.3 ‐ 9.4 ‐ 8.4 ‐ 7.4 ‐ 4.9 ‐ 2.8 ‐ 2.2 ‐ 1.2 0.1 0.9 2.0 2.7 4.3 4.4 4.3 1.1 0.9 2.5 2.2 1.7 1.1 ‐ 1.6 4.4 ‐ 9.4 4/3/2010 4/4/2010 4/5/2010 0.2

‐ 0.4 ‐ 1.1 ‐ 1.2 ‐ 1.3 ‐ 1.3 ‐ 0.9 ‐ 3.0 ‐ 4.0 ‐ 4.5 ‐ 4.6 ‐ 3.2 ‐ 2.9 ‐ 3.9 ‐ 4.1 ‐ 3.4 ‐ 4.0 ‐ 3.8 ‐ 5.4 ‐ 5.7 ‐ 6.8 ‐ 7.0 ‐ 6.4 ‐ 5.7 ‐ 3.5 0.2 ‐ 7.0 4/6/2010 4/7/2010 4/8/2010 1.6 2.0 1.8 1.9 1.4 2.1 2.6 4.5 5.6 7.5 9.3 10.6 11.7 12.9 14.0 14.2 13.8 12.5 8.9 7.2 4.6 3.1 1.0

‐ 0.5 6.4 14.2 ‐ 0.5 4/9/2010 4/10/2010 4/11/2010 6.4 5.9 6.0 6.1 5.9 5.4 5.2 5.5 6.2 7.3 9.2 10.7 11.3 11.8 11.6 11.5 11.1 10.3 9.5 8.8 8.1 7.9 7.7 6.7 8.2 11.8 5.2

Avg ‐ 3.7 ‐ 4.0 ‐ 4.1 ‐ 4.2 ‐ 4.4 ‐ 4.6 ‐ 4.6 ‐ 4.0 ‐ 2.2 ‐ 0.5 0.4 1.2 1.9 2.4 2.4 2.1 1.2 ‐ 0.1 ‐ 1.2 ‐ 1.6 ‐ 2.0 ‐ 2.2 ‐ 2.5 ‐ 2.9 ‐ 1.6 ‐‐ ‐‐ Max 7.0 7.0 6.9 6.5 6.2 5.6 5.6 5.8 9.1 11.2 12.1 12.4 12.8 12.9 14.0 14.2 13.8 12.5 9.5 8.8 8.1 7.9 7.7 6.7 ‐‐ 14.2 ‐‐ Min ‐ 15.8 ‐ 16.1 ‐ 15.7 ‐ 16.7 ‐ 16.9 ‐ 16.5 ‐ 16.1 ‐ 16.0 ‐ 12.8 ‐ 8.7 ‐ 7.5 ‐ 6.4 ‐ 6.0 ‐ 5.3 ‐ 5.2 ‐ 6.3 ‐ 10.0 ‐ 13.4 ‐ 14.3 ‐ 14.0 ‐ 13.9 ‐ 13.7 ‐ 13.0 ‐ 13.0 ‐‐ ‐‐ ‐ 16.9

‐‐ Indicates invalid data. Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ DayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min 12/9/2009 64 63 61 68 68 71 71 72 61 47 43 37 40 37 32 36 50 61 63 61 60 58 57 55 56 72 32 12/10/2009 12/11/2009 12/12/2009

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 93 93 88 90 93 92 93 88 12/13/2009 12/14/2009 12/15/2009 66 68 69 68 68 72 73 72 68 66 62 63 60 61 63 59 56 57 55 69 64 50 50 48 63 73 48 12/16/2009 12/17/2009 12/18/2009

‐‐ ‐‐ 77 77 78 80 80 79 65 57 57 53 51 49 50 55 62 74 77 78 78 79 81 82 69 82 49 12/19/2009 12/20/2009 12/21/2009 60 63 64 63 68 62

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 59 58 52 54 57 59 60 62 63 65 68 71 73 62 73 52 12/22/2009 12/23/2009 12/24/2009 81 78 77 80 79 78 78 75 63 55 52 41 44 45 43 48 57 66 66 65 64 61 62 60 63 81 41 12/25/2009 12/26/2009 12/27/2009 71 71 69 61 63 64 65 72 63 45 49 45 48 46 42 51 59 59 58 63 72 64 63 66 60 72 42 12/28/2009 12/29/2009 12/30/2009 87 89 93 97 97 96 97 97 95 96 95 96 95 95 95 95 96 95 95 93 93 92 91 90 94 97 87 12/31/2009 1/1/2010 1/2/2010 73 73 71 65 71 72 71 73 66 55 49 50 45 43 42 47 54 61 60 57 58 52 52 52 59 73 42 1/3/2010 1/4/2010 1/5/2010 54 55 46 46 51 46 45 49 52 40 38 37 37 30 27 31 37 46 49 50 50 53 57 58 45 58 27 1/6/2010 1/7/2010 1/8/2010 90 90 92 93 89 92 95 94 93 94 88 79 78 74 68 67 68 73 78 61 64 70 65 58 80 95 58 1/9/2010 1/10/2010 1/11/2010 79 80 78 78 75 76 84 85 68 63 61 62 62 55 48 51 57 61 56 48 46 51 55 56 64 85 46 1/12/2010 1/13/2010 1/14/2010 87 87 91 90 91 94 96 97 92 78 72 64 59 55 53 54 61 73 78 79 79 80 79 80 78 97 53 1/15/2010 1/16/2010 1/17/2010 50 53 56 56 54 53 54 55 53 53 53 54 53 53 53 55 57 56 58 61 74 85 92 92 60 92 50 1/18/2010 1/19/2010 1/20/2010 82 85 88 88 86 87 86 86 85 91 85 83 84 89 88 88 90 91 91 91 90 89 89 88 87 91 82 1/21/2010 1/22/2010 1/23/2010 84 86 86 87 88 88 91 90 86 76 72 69 62 57 57 56 61 64 67 70 72 75 76 77 75 91 56 1/24/2010 1/25/2010 1/26/2010 84 83 83 81 78 77 80 79 72 68 64 66 59 60 59 67 70 74 73 71 66 67 69 74 72 84 59 1/27/2010 1/28/2010 1/29/2010 95 94 94 95 93 84 85 91 71 67 70 63 57 59 58 63 66 71 69 52 51 55 61 62 72 95 51 1/30/2010 1/31/2010 2/1/2010

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 64 71 66 69 64 58 53 53 44 49 53 56 48 51 47 49 49 48 52 55 71 44 2/2/2010 2/3/2010 2/4/2010 74 76 75 77 76 80 83 81 71 64 65 56 50 45 49 50 51 53 57 63 66 71 78 72 66 83 45 2/5/2010 2/6/2010 2/7/2010 98 99 99 99 99 99 99 99 99 99 98 98 98 98 97 98 98 97 96 96 96 94 93 89 97 99 89 2/8/2010 2/9/2010 2/10/2010 87 87 84 86 89 91 90 89 84 75 69 57 55 54 51 57 65 70 78 77 76 76 73 77 75 91 51 2/11/2010 2/12/2010 2/13/2010 45 52 57 58 60 62 59 56 54 43 48 50 48 46 46 46 48 57 69 71 71 74 74 74 57 74 43 2/14/2010 2/15/2010 Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: RH_percen t Month: 12/09/2009 ‐ 04/11/2010 Hour of day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ DayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: RH_percen t Month: 12/09/2009 ‐ 04/11/2010 Hour of day 2/16/2010 77 78 77 76 79 81 81 79 67 66 60 54 54 50 48 50 56 65 69 73 78 80 81 86 69 86 48 2/17/2010 2/18/2010 2/19/2010 85 90 97 98 99 99 99 99 96 87 73 63 58 66 71 71 80 88 91 91 81 88 89 89 85 99 58 2/20/2010 2/21/2010 2/22/2010 95 94 94 93 92 92 90 87 79 69 63 60 52 51 48 50 52 59 63 69 68 67 69 70 72 95 48 2/23/2010 2/24/2010 2/25/2010 92 94 92 92 94 96 97 91 77 75 72 66 59 56 50 55 51 59 64 67 66 64 62 65 73 97 50 2/26/2010 2/27/2010 2/28/2010 100 100 100 100 100 100 99 99 98 96 87 76 68 65 61 62 62 69 76 78 80 85 86 87 85 100 61 3/1/2010 3/2/2010 3/3/2010 88 87 82 82 87 88 86 85 81 80 80 73 70 61 53 53 56 59 53 55 59 63 63 64 71 88 53 3/4/2010 3/5/2010 3/6/2010 63 63 63 62 62 61 60 57 55 51 47 44 43 42 44 44 46 50 57 54 53 56 83 87 56 87 42 3/7/2010 3/8/2010 3/9/2010 97 97 97 97 97 97 97 97 97 97 96 95 92 88 87 80 78 85 90 93 95 94 88 86 92 97 78 3/10/2010 3/11/2010 3/12/2010 65 66 64 62 64 66 53 52 39 39 46 50 42 46 42 42 47 52 55 50 55 51 54 50 52 66 39 3/13/2010 3/14/2010 3/15/2010 74 77 79 77 77 80 79 65 50 46 50 44 40 40 38 39 42 47 56 60 58 55 54 57 58 80 38 3/16/2010 3/17/2010 3/18/2010 60 62 62 64 66 71 71 66 72 80 80 88 90 75 57 47 37 40 50 58 63 63 64 64 65 90 37 3/19/2010 3/20/2010 3/21/2010 32 31 32 32 33 34 32 32 28 27 31 28 27 24 27 20 27 23 30 23 24 29 29 32 29 34 20 3/22/2010 3/23/2010 3/24/2010 59 59 60 60 59 60 57 49 40 36 30 27 23 26 25 24 26 28 23 22 28 31 34 37 38 60 22 3/25/2010 3/26/2010 3/27/2010 88 87 87 89 86 84 82 68 58 54 46 39 28 22 22 21 20 26 39 42 39 31 30 32 51 89 20 3/28/2010 3/29/2010 3/30/2010 31 32 32 33 35 36 37 38 30 24 20 18 16 26 30 19 18 23 34 51 54 59 59 60 34 60 16 3/31/2010 4/1/2010 4/2/2010 93 90 88 89 88 86 82 74 64 63 56 54 56 52 56 49 48 51 85 86 70 67 53 52 69 93 48 4/3/2010 4/4/2010 4/5/2010 37 39 47 56 61 69 73 92 98 97 97 97 96 91 81 70 77 71 89 93 94 89 84 78 78 98 37 4/6/2010 4/7/2010 4/8/2010 57 55 54 54 55 51 49 43 42 37 37 34 31 28 24 21 20 23 35 38 50 63 78 83 44 83 20 4/9/2010 4/10/2010 4/11/2010 24 26 27 27 27 28 26 24 24 23 20 17 17 16 17 15 13 14 16 20 22 22 25 31 22 31 13

Avg 73 73 74 74 75 75 75 74 68 63 61 58 55 53 51 52 55 59 63 64 65 66 67 68 65 ‐‐ ‐‐ Max 100 100 100 100 100 100 99 99 99 99 98 98 98 98 97 98 98 97 96 96 96 94 93 93 ‐‐ 100 ‐‐ Min 24 26 27 27 27 28 26 24 24 23 20 17 16 16 17 15 13 14 16 20 22 22 25 31 ‐‐ ‐‐ 13

‐‐ Indicates invalid data. Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ DayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min 12/9/2009

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 12/10/2009 12/11/2009 12/12/2009

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 12/13/2009 12/14/2009 12/15/2009

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 12/16/2009 12/17/2009 12/18/2009

‐‐ ‐‐ 604 604 604 604 605 605 605 605 605 604 604 604 604 604 604 604 604 604 604 605 605 605 604 605 604 12/19/2009 12/20/2009 12/21/2009 600 600 600 600 600 599

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 597 597 596 596 595 595 595 594 594 593 593 593 592 596 600 592 12/22/2009 12/23/2009 12/24/2009 604 604 604 604 604 604 604 604 604 605 604 604 604 604 604 604 603 604 604 603 603 603 603 603 604 605 603 12/25/2009 12/26/2009 12/27/2009 600 600 600 600 600 600 600 601 601 601 601 601 601 601 601 602 602 602 602 602 602 602 603 603 601 603 600 12/28/2009 12/29/2009 12/30/2009 597 597 597 597 597 597 598 598 598 599 599 599 599 599 600 600 601 601 602 602 603 603 603 604 600 604 597 12/31/2009 1/1/2010 1/2/2010 603 603 603 603 603 604 604 604 604 604 604 604 604 603 603 603 604 604 604 604 604 604 605 605 604 605 603 1/3/2010 1/4/2010 1/5/2010 604 603 603 603 603 603 603 603 604 604 604 603 603 603 602 602 602 603 603 603 603 603 603 603 603 604 602 1/6/2010 1/7/2010 1/8/2010 604 604 604 604 604 604 604 604 604 604 604 604 604 603 603 603 604 604 604 604 604 604 605 605 604 605 603 1/9/2010 1/10/2010 1/11/2010 606 606 606 606 606 605 605 606 606 606 606 605 604 604 604 603 603 603 603 603 603 603 603 602 604 606 602 1/12/2010 1/13/2010 1/14/2010 603 603 604 604 604 604 605 605 606 606 606 606 606 606 606 606 606 607 607 607 607 607 606 606 606 607 603 1/15/2010 1/16/2010 1/17/2010 597 597 597 597 596 596 596 596 596 596 596 596 595 594 594 594 594 594 595 595 595 595 595 595 595 597 594 1/18/2010 1/19/2010 1/20/2010 587 587 587 587 587 588 588 588 588 588 588 587 586 584 584 584 583 583 583 583 583 583 582 582 585 588 582 1/21/2010 1/22/2010 1/23/2010 589 589 590 590 591 592 592 593 593 594 595 595 595 595 596 596 597 597 598 598 599 599 599 600 595 600 589 1/24/2010 1/25/2010 1/26/2010 596 596 596 596 596 596 596 596 597 597 598 598 597 597 597 597 597 597 597 597 597 597 597 597 597 598 596 1/27/2010 1/28/2010 1/29/2010 601 601 601 601 600 600 600 600 600 600 600 600 599 599 599 599 599 599 599 598 598 598 598 598 599 601 598 1/30/2010 1/31/2010 2/1/2010

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 598 598 598 598 598 598 598 597 597 597 597 597 597 597 597 597 597 597 597 597 598 597 2/2/2010 2/3/2010 2/4/2010 595 595 595 595 595 595 595 596 596 596 596 595 595 595 594 594 594 595 595 595 595 595 595 596 595 596 594 2/5/2010 2/6/2010 2/7/2010 593 593 593 592 592 592 593 593 593 594 594 594 594 594 594 595 595 595 596 596 596 596 596 597 594 597 592 2/8/2010 2/9/2010 2/10/2010 597 597 597 597 597 597 597 598 598 598 599 598 598 598 597 597 598 598 598 598 598 598 598 598 598 599 597 2/11/2010 2/12/2010 2/13/2010 602 602 602 602 602 602 603 603 603 603 603 603 603 603 603 603 603 603 603 603 604 604 603 604 603 604 602 2/14/2010 2/15/2010 Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: BP_mmH g Month: 12/09/2009 ‐ 04/11/2010 Hour of day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day

Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ DayDay 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Max Min SAROAD for Barrick, RubyHill ‐ HCN Monito r Channel: BP_mmH g Month: 12/09/2009 ‐ 04/11/2010 Hour of day 2/16/2010 602 602 602 602 602 602 602 603 603 603 603 603 603 602 602 602 602 602 602 603 603 603 602 603 602 603 602 2/17/2010 2/18/2010 2/19/2010 595 595 595 595 595 595 595 595 595 595 595 595 594 594 594 594 594 594 594 594 594 594 594 594 595 595 594 2/20/2010 2/21/2010 2/22/2010 597 597 597 598 598 598 599 600 600 601 601 601 601 601 602 602 602 602 602 603 603 603 603 603 601 603 597 2/23/2010 2/24/2010 2/25/2010 600 601 601 601 601 601 601 602 602 602 603 603 603 603 603 603 603 603 603 603 603 603 603 603 602 603 600 2/26/2010 2/27/2010 2/28/2010 594 594 594 594 595 595 596 596 597 597 598 598 598 598 598 599 599 599 600 600 601 601 601 601 598 601 594 3/1/2010 3/2/2010 3/3/2010

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 3/4/2010 3/5/2010 3/6/2010

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 3/7/2010 3/8/2010 3/9/2010

‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 594 594 595 595 595 595 595 595 595 595 595 595 595 595 594 595 595 594 3/10/2010 3/11/2010 3/12/2010 601 601 601 601 600 600 600 600 600 600 600 599 598 598 597 597 596 596 596 596 596 595 595 594 598 601 594 3/13/2010 3/14/2010 3/15/2010 606 606 606 606 606 606 606 606 607 607 607 607 607 607 607 606 606 607 607 608 608 608 608 608 607 608 606 3/16/2010 3/17/2010 3/18/2010 601 600 600 600 600 600 600 600 601 601 601 601 601 600 600 600 600 600 600 601 601 602 602 602 601 602 600 3/19/2010 3/20/2010 3/21/2010 604 604 603 603 603 603 603 603 603 603 603 603 602 602 601 601 601 601 600 600 601 601 601 601 602 604 600 3/22/2010 3/23/2010 3/24/2010 603 603 602 602 602 602 602 602 602 602 602 601 601 600 600 600 599 599 599 599 598 598 597 597 600 603 597 3/25/2010 3/26/2010 3/27/2010 604 604 604 605 605 605 606 606 606 606 606 606 606 605 605 605 605 605 605 605 606 606 606 605 605 606 604 3/28/2010 3/29/2010 3/30/2010 592 592 591 591 591 590 590 590 590 590 589 590 590 590 590 590 590 591 591 592 593 593 593 593 591 593 589 3/31/2010 4/1/2010 4/2/2010 598 598 598 598 598 598 598 598 598 597 597 596 596 595 594 593 593 593 594 594 593 594 594 594 596 598 593 4/3/2010 4/4/2010 4/5/2010 590 590 590 589 589 589 589 590 590 591 592 592 592 593 594 594 595 596 596 597 598 598 598 599 593 599 589 4/6/2010 4/7/2010 4/8/2010 602 601 601 601 600 600 600 600 600 600 600 599 599 598 597 597 597 597 597 597 598 598 598 599 599 602 597 4/9/2010 4/10/2010 4/11/2010 596 595 595 595 595 595 596 596 596 596 596 595 595 594 594 593 593 593 593 592 592 592 592 592 594 596 592

Avg 599 599 599 599 599 599 599 599 600 600 600 599 599 599 599 599 599 599 599 599 599 599 599 599 599 ‐‐ ‐‐ Max 606 606 606 606 606 606 606 606 607 607 607 607 607 607 607 606 606 607 607 608 608 608 608 608 ‐‐ 608 ‐‐ Min 587 587 587 587 587 588 588 588 588 588 588 587 586 584 584 584 583 583 583 583 583 583 582 582 ‐‐ ‐‐ 582

‐‐ Indicates invalid data. Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day Non ‐ Run ‐ Day

# APPENDIX B 

# HCN DataPage 1 of 2 Wed, 01/06/10 5:25 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date January 06, 2010

Project Manager 

### Rand Potter Workorder: 9365024 Purchase Order: Client Project ID: 

### Air Sciences 123109

59-57-5 Analytical Results 12/26/2009 12/31/2009 9365024001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 595712262009-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/6/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 12/26/2009 12/31/2009 9365024002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 595712262009-2 

### Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/6/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 12/26/2009 12/31/2009 9365024003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 595712262009-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/6/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123

IHREP-V9.8Page 2 of 2 Wed, 01/06/10 5:26 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 9365024 Purchase Order: Client Project ID: 

### Air Sciences 123109

59-57-5

The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Wed, 01/13/10 2:14 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date January 13, 2010

Project Manager 

### Rand Potter Workorder: 1000617 Purchase Order: Client Project ID: 

### Ruby Hill 59-57-5 010610

59-57-5 Analytical Results 1/3/2010 1/6/2010 1000617001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 595701032010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/12/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/3/2010 1/6/2010 1000617002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 595701032010-2 

### Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/12/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/3/2010 1/6/2010 1000617003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 595701032010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/12/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123

IHREP-V9.8Page 2 of 2 Wed, 01/13/10 2:14 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1000617 Purchase Order: Client Project ID: 

### Ruby Hill 59-57-5 010610

59-57-5

The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Wed, 01/20/10 1:23 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date January 20, 2010

Project Manager 

### Rand Potter Workorder: 1001934 Purchase Order: Client Project ID: 

### Air Sciences Inc 011910

59-57-5 Analytical Results 1/5/2010 1/19/2010 1001934001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957152010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/19/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/5/2010 1/19/2010 1001934002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957182010-2 

### Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/19/2010 RL (ug/sample)

0.21 NA 0.32 

### NA Hydrogen Cyanide 

### 1/5/2010 1/19/2010 1001934003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59571112010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/19/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/5/2010 1/19/2010 1001934004 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 Field Blank Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/19/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide

IHREP-V9.8Page 2 of 2 Wed, 01/20/10 1:23 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1001934 Purchase Order: Client Project ID: 

### Air Sciences Inc 011910

59-57-5 Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Fri, 01/29/10 3:39 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date January 29, 2010

Project Manager 

### Rand Potter Workorder: 1002525 Purchase Order: Client Project ID: 

### Air Sciences Inc 012510

59-57-5 Analytical Results 1/21/2010 1/25/2010 1002525001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59571232010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/28/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/21/2010 1/25/2010 1002525002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59571262010-2 

### Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/28/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/21/2010 1/25/2010 1002525003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59571292010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 1/28/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123

IHREP-V9.8Page 2 of 2 Fri, 01/29/10 3:39 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1002525 Purchase Order: Client Project ID: 

### Air Sciences Inc 012510

59-57-5

The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Tue, 02/09/10 11:18 AM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date February 09, 2010

Project Manager 

### Rand Potter Workorder: 1003529 Purchase Order: Client Project ID: 

### Air Sciences 020410

59-57-5 Analytical Results 1/31/2010 2/4/2010 1003529001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957212010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/8/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/31/2010 2/4/2010 1003529002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957242010-2 

### Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/8/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide 

### 1/31/2010 2/4/2010 1003529003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957272010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/8/2010 RL (ug/sample)

0.21 NA 0.24 

### NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123

IHREP-V9.8Page 2 of 2 Tue, 02/09/10 11:18 AM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1003529 Purchase Order: Client Project ID: 

### Air Sciences 020410

59-57-5

The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Fri, 02/19/10 11:02 AM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date February 19, 2010

Project Manager 

### Rand Potter Workorder: 1004717 Purchase Order: Client Project ID: 

### Ruby Hill 59-57-5 021610

59-57-5 Analytical Results 2/8/2010 2/16/2010 1004717001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572102010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/18/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 2/8/2010 2/16/2010 1004717002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572132010-2 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/18/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 2/8/2010 2/16/2010 1004717003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572162010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/18/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Fri, 02/19/10 11:02 AM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1004717 Purchase Order: Client Project ID: 

### Ruby Hill 59-57-5 021610

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Wed, 02/24/10 4:02 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date February 24, 2010

Project Manager 

### Rand Potter Workorder: 1005311 Purchase Order: Client Project ID: 

### Air Sciences 022210

59-57-5 Analytical Results 2/17/2010 2/22/2010 1005311001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572192010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/24/2010 RL (ug/sample)

0.21 NA 0.27 

### NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA 0.27 

### NA Hydrogen Cyanide 

### 2/17/2010 2/22/2010 1005311002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572222010-2 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/24/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 2/17/2010 2/22/2010 1005311003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572252010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 2/24/2010 RL (ug/sample)

0.21 NA 0.27 

### NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA 0.27 

### NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Wed, 02/24/10 4:02 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1005311 Purchase Order: Client Project ID: 

### Air Sciences 022210

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Tue, 03/16/10 1:10 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date March 16, 2010

Project Manager 

### Rand Potter Workorder: 1006345 Purchase Order: Client Project ID: 

### Air Sciences 030410 1

59-57-5 Analytical Results 2/26/2010 3/4/2010 1006345001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957212010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/15/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 2/26/2010 3/4/2010 1006345002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957242010-2 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/15/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 2/26/2010 3/4/2010 1006345003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957272010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/15/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Tue, 03/16/10 1:10 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1006345 Purchase Order: Client Project ID: 

### Air Sciences 030410 1

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Tue, 03/23/10 6:39 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date March 23, 2010

Project Manager 

### Rand Potter Workorder: 1008123 Purchase Order: Client Project ID: 

### Air Sciences 032210 3

59-57-5 Analytical Results 3/8/2010 3/22/2010 1008123001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572102010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/23/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 3/8/2010 3/22/2010 1008123002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572132010-2 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/23/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 3/8/2010 3/22/2010 1008123003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572162010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/23/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Tue, 03/23/10 6:39 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1008123 Purchase Order: Client Project ID: 

### Air Sciences 032210 3

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Tue, 03/23/10 6:38 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date March 23, 2010

Project Manager 

### Rand Potter Workorder: 1008122 Purchase Order: Client Project ID: 

### Air Sciences 032210 2

59-57-5 Analytical Results 3/17/2010 3/22/2010 1008122001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572192010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/23/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 3/17/2010 3/22/2010 1008122002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572222010-2 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/23/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 3/17/2010 3/22/2010 1008122003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59572252010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 3/23/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Tue, 03/23/10 6:38 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1008122 Purchase Order: Client Project ID: 

### Air Sciences 032210 2

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Wed, 04/07/10 4:02 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date April 07, 2010

Project Manager 

### Rand Potter Workorder: 1008809 Purchase Order: Client Project ID: 

### Air Sciences 032910

59-57-5 Analytical Results 3/25/2010 3/29/2010 1008809001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59573272010-1 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 4/7/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 3/25/2010 3/29/2010 1008809002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59573302010-2 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 4/7/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 3/25/2010 3/29/2010 1008809003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 59574022010-3 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 4/7/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Wed, 04/07/10 4:02 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1008809 Purchase Order: Client Project ID: 

### Air Sciences 032910

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Fri, 04/16/10 5:23 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date April 16, 2010

Project Manager 

### Rand Potter Workorder: 1009711 Purchase Order: Client Project ID: 

### Air Sciences Inc 040710

59-57-5 Analytical Results 4/4/2010 4/7/2010 1009711001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957-001 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 4/16/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 4/4/2010 4/7/2010 1009711002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957-002 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 4/16/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 4/4/2010 4/7/2010 1009711003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957-003 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 4/16/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Fri, 04/16/10 5:23 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1009711 Purchase Order: Client Project ID: 

### Air Sciences Inc 040710

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8Page 1 of 2 Tue, 05/11/10 4:51 PM 

## ANALYTICAL REPORT

Tom Brauch Air Sciences, Inc. 1301 Washington Ave, Suite 200 Golden, CO 80401 Phone: E-mail: (303) 988-2960 x 207 tbrauch@airsci.com Report Date May 11, 2010

Project Manager 

### Rand Potter Workorder: 1012316 Purchase Order: Client Project ID: 

### Air Sciences 050310

59-57-5 Analytical Results 4/12/2010 5/3/2010 1012316001 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957-001 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 5/11/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 4/12/2010 5/3/2010 1012316002 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957-002 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 5/11/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### 4/12/2010 5/3/2010 1012316003 Sample ID: Lab ID: Media: Collected: Received: SKC 226-28, Soda Lime-200/600 5957-003 Sampling Location: Ruby Hill Method: Analyte ug/sample mg/m3 ppm 

### NIOSH 6010 Analyzed: 5/11/2010 RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide(Front) 0.21 NA <0.21 NA Hydrogen Cyanide(Back) 0.21 NA <0.21 NA Hydrogen Cyanide 

### Report Authorization Method: NIOSH 6010 Sarah E. Adamson Rosemary Hanks Analyst Peer Review

IHREP-V9.8Page 2 of 2 Tue, 05/11/10 4:51 PM 

## ANALYTICAL REPORT

Project Manager 

### Rand Potter Workorder: 1012316 Purchase Order: Client Project ID: 

### Air Sciences 050310

59-57-5

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com 

### Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123 The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods. 

### ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted. All quality control samples processed with the samp les in this report yielded acceptable results unles s otherwise noted. 

### General Lab Comments

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. 

### Definitions

IHREP-V9.8

# APPENDIX C 

# Site Check Forms, Audits, and Calibration

## Calibration Form Ruby Hill A ir Quality and Meteorological Monitoring Site: Ruby Hill Technician: Tom Brauch Date: Site Conditions: Cold, Windy Invalid Data Range: Before 12/07/2009 Logger Serial Number: 3012 Initial Prior to Departure Initials Data download (record date and time). TWB Time and date verified on datalogger. TWB Communications verified. TWB All public real ‐ time values are confirmed and as expected. TWB WS/WD verification performed (complete audit form). N/A Temperature and RH verification performed (complete audit form). TWB Precipitation verification performed (complete audit form). N/A Barometric pressure verification performed (complete audit form). TWB Solar panel cleaned. TWB Comments: Site was installed and became operational on 12/07/2009 All sensors were calibrated

Signature Date: 12/7/2009

12/7/2009

59 ‐ 57 ‐ 12072009CALAQ ‐ MET 1

### Calibration Form 

## Ruby Hill A ir Quality and Meteorological Monitoring

Time: 17:00 to 18:00 PST Time: 17:00 to 18:00 PST Diff Diff 1. ‐ 4.1 1. ‐ 3.9 ‐ 0.2 1. 63 1. 60 3 2. ‐ 4.1 2. ‐ 3.9 ‐ 0.2 2. 63 2. 60 3 3. ‐ 4.2 3. ‐ 4.1 ‐ 0.1 3. 62 3. 60 2 4. ‐ 4.2 4. ‐ 4.1 ‐ 0.1 4. 62 4. 61 1 5. ‐ 4.2 5. ‐ 4.2 0.0 5. 63 5. 61 2 6. ‐ 4.3 6. ‐ 4.2 ‐ 0.1 6. 62 6. 61 1 7. ‐ 4.3 7. ‐ 4.3 0.0 7. 62 7. 62 0 8. ‐ 4.3 8. ‐ 4.3 0.0 8. 62 8. 62 0 9. ‐ 4.3 9. ‐ 4.3 0.0 9. 60 9. 62 ‐ 2 10. ‐ 4.4 10. ‐ 4.3 ‐ 0.1 10. 60 10. 61 ‐ 1 Average Difference ‐ 0.1 0.9 Difference = Site ‐ Measured

Time: 17:00 PST Diff * 1. 611.0 1. 610 1 2. 611.0 2. 610 1 3. 612.0 3. 610 2 4. 611.0 4. 610 1 Average Difference 1.25 *Difference = Site ‐ Measured Measured Brunton Altimeter VWR Thermo Hygro SN: D3250101 SN: 80357103 VWR Thermo Hygro HMP45C Logger Temperature HMP45C Logger Measured

mmHg 

### Barometric Pressure ‐ Co ‐ Located Calibration

SN: NA Barometric Pressure SN: D3250101

mmHg SN: 80357103 

### Temperature and Relative Humidity ‐ Co ‐ Located Calibration

Relative Humidity Measured

Logger Reading SN: D3140098

59 ‐ 57 ‐ 12072009CALAQ ‐ MET 2

## Calibration Form Ruby Hill A ir Quality and Meteorological Monitoring Time : 17:00 to 18:00 MST

Diff * Diff * 1. 0.0 1. 0.0 0.0 1. 0 1. 2 ‐ 2 2. 1.0 2. 1.0 0.0 2. 45 2. 44 1 3. 2.0 3. 2.0 0.0 3. 90 3. 89 1 4. 3.1 4. 3.1 0.0 4. 135 4. 132 3 5. 4.1 5. 4.1 0.0 5. 180 5. 179 1 6. 5.1 6. 5.1 0.0 6. 225 6. 223 2 7. 10.2 7. 10.2 0.0 7. 270 7. 270 0 8. 15.4 8. 15.4 0.0 8. 315 8. 312 3 9. 20.5 9. 20.5 0.0 10. 25.6 10. 25.6 0.0 Average Difference 0 1.125 *Difference = Site ‐ Measured

Comments:

Signature Date: Wind Speed Wind Speed Wind Direction Wind Direction

Standard Site Standard Site

Motor R. M. Young (m/s) Sensor Base R. M. Young (deg) SN: Set C SN: 79696 

### Wind Speed and Wind Direction Gill 2 ‐ D Sonic ‐ Co ‐ Located Sensor Comparison ‐ Real ‐ Time Comparison

SN: 79696

12/7/2009

59 ‐ 57 ‐ 12072009CALAQ ‐ MET 3

### Calibration Form 

## Ruby Hill A ir Quality and Meteorological Monitoring

Time: 17:00 ‐ 18:00 PST

1. 33.9 1. 49.97 1. 49.6 1. 1.060 1. 0.847 1. 0.06461 2. 31.1 2. 45 2. 45.1 2. 1.000 2. 0.862 2. 0.06095 3. 28.37 3. 40.5 3. 40.7 3. 0.927 3. 0.876 3. 0.0565 4. 23.58 4. 34.1 4. 34.3 4. 0.808 4. 0.896 4. 0.04925 5. 20.16 5. 30.1 5. 30.2 5. 0.731 5. 0.908 5. 0.04456 6. 16.75 6. 25.1 6. 25.1 6. 0.634 6. 0.923 6. 0.03864 7. 7. 7. 7. 7. 7. 8. 8. 8. 8. 8. 8. 9. 9. 9. 9. 9. 9. 10. 10. 10. 10. 10. 10. 25.643333 37.4617 37.5 0.86

a Difference = Site ‐ Measured b Difference = ((Site – Measured)/Measured)*100

Notes for next trip:

Signature Date: Temp ( o C) BP (mm Hg)

‐ 4 611 P1/Pa Qa (Flow Meter)

Tube 1 Flow Tube 2 Flow Tube 3 Flow

‐ 2.8628 1.0356 ‐ 0.9972 SN: 35543F3

Slope Intercept Correlation SN: 35542F3 SN: 35583F3 SN: 35545F3 Inches Digital Manometer Raw Inches Sampler 

### HCN Sampler System

Flow (L/min) Low Flow BIOS

12/7/2009 mV Pressure Transducer

59 ‐ 57 ‐ 12072009CALAQ ‐ MET 4

# APPENDIX D 

# Hydrogen Cyanide (HCN) Fence Line Monitoring Plans

# Site-Specific Hydrogen Cyanide (HCN) Fence Line Monitoring Plan

H OMESTAKE 

# M INING 

# C OMPANY OF 

# C ALIFORNIA 

# , B

ARRICK 

# R UBY 

# H ILL 

# M INE

P ROJECT 

### 59-51-3 O

CTOBER 

### 2009 U PDATED 

### N OVEMBER 

### 24, 2009

### ii 

# CONTENTS Page 1 INTRODUCTION ................................................................................................................ ............................................ 1 1.1 Mine Description and Proposed Monitoring .................................................................................. .......................... 1 2 METEOROLOGY ................................................................................................................. .......................................... 2 2.1 Prevailing Wind Direction ................................................................................................. ....................................... 2 3 PROPOSED HCN MONITORING SITE ................................................................................................ ......................... 4 3.1 Operations Boundary and Nearest Population Areas .......................................................................... ................... 4 3.2 Potential Sources of HCN .................................................................................................. ..................................... 4 3.3 Proposed HCN Monitor Location ............................................................................................. ............................... 4 4 PROPOSED MODIFICATIONS TO THE GENERAL HCN MONITORING PLAN ......................................................... 8 

## Figures Figure 2.1: Calendar Year 2008 Wind Rose ..................................................................................... ............................... 2 Figure 2.2: Calendar Quarter Wind Roses for 2008 ............................................................................. ............................ 3 Figure 3.1: Proposed HCN Monitoring Site ..................................................................................... ................................. 5 Figure 3.2: Large Scale Area Map ............................................................................................. ...................................... 6 Figure 3.3: Refinery ......................................................................................................... ................................................. 7 

## Appendices Appendix A: Hydrogen Cyanide (HCN) Fence Line Monitoring Plan

### 1 

### SECTION 1 

# INTRODUCTION 1.1 Mine Description and Proposed Monitoring Homestake Mining Company of California, Barrick Ruby Hill Mine (Ruby Hill) operates a gold mining facility located 0.7 mile northwest of Eureka, Nevada on Highway 50. The facility operates an open-pit mine. Gold recovery oper ations include: ore crushing, heap leaching, carbon adsorption, stripping and regeneration, elec trowinning, retorting, an d refining. The leach solutions used in the gold recovery processes contain cyanide. These solutions have the potential for low levels of hydrogen cyanide (HCN) formation and emission to the atmosphere. To assess the ambient concentrations of HCN, Ruby Hill plans to install and operate an HCN monitor downwind of the potential HCN sources ne ar the Ruby Hill operations area. The HCN monitoring equipment and sa mpling procedures will follow the Hydrogen Cyanide (HCN) Fence Line Monitoring Plan , approved by EPA on October 9, 2009 (General HCN Monitoring Plan). This plan is provided in Appe ndix A. The purposes of the site-specific plan described herein are to identify the location where the monitor will be sited and to identify any modifications to the monitoring equipment and sampling procedures described in the General HCN Monitoring Plan that are specific to Ruby Hill. Per EPA’s instructions, the site location takes into consideration the proximity of the HCN sources to public access areas and the prevailing wind direction. The site location also takes into consideration accessibility for the Ruby Hill maintenance and project technicians. The following sections describe the predominan t wind direction, the Ruby Hill operations boundary, the nearest population areas to this boundary, the potential sources of HCN emissions and their locations, and the proposed HCN monitor site. The HCN monitoring system proposed herein is a new system. Typically, a full field test and system verification of such a prototype monitor would be scheduled in advance of deploying the monitor for data collection. This is done in orde r to identify system design problems, and refine the system configuration and operating and mainte nance procedures as appropriate. Due to the schedule that EPA has requested, only limited field testing and system verification will be possible prior to data collection. Because of this , it is possible that problems may arise with the monitoring system which will affect data collection; however, Ruby Hill will take all reasonable measures to avoid such problems in an effort to minimize any disruptions to the monitoring program.

### 2 

### SECTION 2 

# METEOROLOGY 2.1 Prevailing Wind Direction Ruby Hill currently operates a meteorological station. This station is located in the nearby town of Eureka, Nevada, approximately 0.7 mile southeast of the mine. Figure 2.1 summarizes the hourly wind directions (the direction from which the wind is blowing) and wind speeds for the 2008 calendar year. Figure 2.2 provides wind roses for each calendar quarter of 2008. As shown by the annual and quarterly wind roses, the prevailing wind direction is from the southsoutheast. 1 

### However, there is also a significant amou nt of winds (26 percent combined) from the west-northwest to the north-northwest. These wi nds blow directly towards the town of Eureka from the potential HCN sources at Ruby Hill. Figure 2.1: Calendar Year 2008 Wind Rose

1 The Ruby Hill meteorological station is missing data for nearl y the entire month of October 2008. Therefore, data from the Eureka airport National Weather Service meteorological station was substituted for this period. This airport station is approximately 4.5 miles north of the mine. 4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

2 4 8 12 18 mph Wind Frequency Distribution - Hourly Met. Data 01/01/08 - 12/31/08 Calm hours = 380 Missing hours =62 Number of non-calm/missing hours = 8342

### 3 Figure 2.2: Calendar Quarter Wind Roses for 2008 

### First Quarter Second Quarter 01/01/08 - 03/31/08 04/01/08 - 06/30/08

Third Quarter Fourth Quarter 07/01/08 - 09/30/08 10/01/08 - 12/31/08 4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

2 4 8 12 18 mph Wind Frequency Distribution - Hourly Met. Data 01/01/08 - 03/31/08 Calm hours = 109 Missing hours = 0 Number of non-calm/missing hours = 2,075 4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

2 4 8 12 18 mph Wind Frequency Distribution - Hourly Met. Data 04/01/08 - 06/30/08 Calm hours = 47 Missing hours = 0 Number of non-calm/missing hours = 2,137

4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

2 4 8 12 18 mph Wind Frequency Distribution - Hourly Met. Data 07/01/08 - 09/30/08 Calm hours = 61 Missing hours = 0 Number of non-calm/missing hours = 2,147 4% 8% 12% 16% 20% 24% 28% 32% 36% 40% N NNE

NE

ENE

E

ESE

SE

SSE S SSW SW WSW W WNW NW NNW

2 4 8 12 18 mph Wind Frequency Distribution - Hourly Met. Data 10/01/08 - 12/31/08 Calm hours = 163 Missing hours = 62 Number of non-calm/missing hours = 1,983

### 4 

### SECTION 3 

# PROPOSED HCN MONITORING SITE 3.1 Operations Boundary a nd Nearest Population Areas Aerial photos and shaded relief maps are proved as Figures 3.1 through 3.3. Figure 3.1 provides an aerial photo of the mine site, the operations boundary, and the potential HCN sources. The operations boundary represents a fence line on the east side and the boundary of the land privately owned and controlled by Ruby Hill on the west side. Figure 3.2 provides a shaded relief map of the area surrounding the Ruby Hill mine. The nearest town is Eureka, located approximately 0.7 mile southeast of the Ruby Hill mine. Eureka is a town of approximately 1,600 residents. There is also a small community approximately 1.5 miles northwest of the mine. Based on a visual surv ey from Google Earth©, there are approximately two dozen structures in the community. 

# 3.2 Potential Sources of HCN Figures 3.1 and 3.3 highlight the potential sources of HCN emissions at Ruby Hill. These sources include an active leach pad, Carbon-in-Column (CIC) tanks, pregnant and barren ponds, a pregnant tank adjacent to the pregnant and barren ponds, a barren tank adjacent to the leach pad, and a single stack for the electrowinning cells an d pregnant and barren tanks at the refinery. A closer view of the refinery area is shown in Figure 3.3. 

# 3.3 Proposed HCN Monitor Location Ruby Hill proposes to place the HCN monitor at a property owned by Ruby Hill on the north end of the town of Eureka. As shown in Figure 3.1, the proposed location is approximately 0.5 mile southeast of the mine. As discussed in Se ction 2.1, 29 percent of the winds are from the south-southeast and 26 percent of the winds are fr om the west-northwest to the north-northwest. The west-northwest to the north-northwest winds bl ow directly towards the town of Eureka from the potential HCN sources. Eureka is the larges t population center near the mine site and the monitoring data collected here will inform the EPA of the HCN exposure to the Eureka residents. The proposed monitor location has line power and is accessible via a road maintained by Ruby Hill. The proposed site coordinates are 588,792 meters east, 4,375,085 me ters north, UTM Zone 11N, NAD83, elevation 6,544 feet.

### 8 

### SECTION 4 

# PROPOSED MODIFICATIONS TO THE GENERAL HCN MONITORING PLAN Ruby Hill does not propose any modifications to the General HCN Monitori ng Plan with regards to the HCN and meteorological sampling equipment. Ruby Hill does propose to modify the sampling duration in the General HCN Monitoring Plan to monitor HCN concentrations at the proposed location for an extra month, totaling three months of monitoring. As discussed in Section 3.3, line power is available at the proposed HCN monitor location. Therefore, the solar power system described in the General HCN Monitoring Plan will not be needed.

# APPENDIX A 

# Hydrogen Cyanide (HCN) Fence Line Monitoring Plan

# Hydrogen Cyanide (HCN) Fence Line Monitoring Plan

N EVADA 

# M INING 

# A SSOCIATION

P ROJECT 

### 59-43-70 O

CTOBER 

### 2009Hcn Sampling Plan_V7.Docx 

### ii 

# CONTENTS Page 1 PROJECT MANAGEMENT ELEMENTS ................................................................................................. ...................... 1 1.1 Sampling Purpose .......................................................................................................... ........................................ 1 1.2 System Description ........................................................................................................ ......................................... 1 2 QUALITY OBJECTIVES AND CRITERIA FOR DATA MEASUREMENT ...................................................................... 3 2.1 Data Quality Objectives and Criteria ...................................................................................... ................................. 3 3 SPECIAL TRAINING REQUIREMENTS/CERTIFICATION ................................................................................. .......... 4 4 DOCUMENTATION OF RECORDS .................................................................................................... .......................... 5 4.1 Data Reporting Package Format and Documentation Control ................................................................... ............ 5 5 DATA GENERATION AND ACQUISITION ............................................................................................. ....................... 6 5.1 Sampling Process Design and Methods Requirements .......................................................................... ............... 6

5.1.1 Purpose ................................................................................................................. .......................................... 6 5.1.2 Sampling Network Design ................................................................................................. .............................. 6 5.1.3 Equipment Description ................................................................................................... ................................. 7 5.1.4 Data Logger ............................................................................................................. ........................................ 7 5.1.5 Wind Speed .............................................................................................................. ....................................... 7 5.1.6 Wind Direction .......................................................................................................... ....................................... 8 5.1.7 Temperature Sensor and Radiation Shield ................................................................................. .................... 8 5.1.8 Relative Humidity ....................................................................................................... ..................................... 8 5.1.9 Barometric Pressure ..................................................................................................... ................................... 8 5.1.10 HCN Sampling System .................................................................................................... .............................. 8 5.1.11 Power and Data Transfer ................................................................................................ ............................ 12 5.1.12 Meteorological Towers .................................................................................................. .............................. 12 5.2 Rationale for Design ...................................................................................................... ....................................... 12 5.3 Scheduled Measurement Activities .......................................................................................... ............................. 12 5.4 Measurement System Failure Response ....................................................................................... ....................... 13 6 SAMPLING METHOD REQUIREMENTS ................................................................................................ .................... 14 6.1 Sample Handling and Custody Requirements .................................................................................. .................... 14 6.2 Analytical Methods Requirements and Breakthrough Check .................................................................... ........... 14 6.3 Quality Control Requirements .............................................................................................. ................................. 14 7 INSTRUMENT/EQUIPMENT TESTING, INSPECTI ON, AND MAINTENANCE REQUIREMENTS ............................ 16 7.1 General Procedures ........................................................................................................ ...................................... 16 7.2 Instrument Calibration and Frequency ...................................................................................... ............................ 16

7.2.1 Calibration Equipment Maintenance ....................................................................................... ...................... 16 7.2.2 Calibration Records and Traceability .................................................................................... ........................ 17 8 INSPECTION/ACCEPTANCE REQUIREMENTS FOR SUPPLIES AND CONSUMABLES ....................................... 18 9 DATA MANAGEMENT ............................................................................................................. .................................... 19 9.1 Data Custody .............................................................................................................. .......................................... 19 10 DATA VALIDATION AND USABILITY .............................................................................................. ......................... 20 10.1 Data Review, Validation, and Certification ............................................................................... ........................... 20

10.1.1 Data Validation ........................................................................................................ .................................... 20 10.1.2 Data Collection ........................................................................................................ .................................... 20 10.1.3 Data Reduction ......................................................................................................... ................................... 20 10.2 Validation Methods ....................................................................................................... ...................................... 21

10.2.1 Data Review and Validation Requirements ................................................................................ ................. 21Hcn Sampling Plan_V7.Docx 

### iii 

# CONTENTS - Continued Page 

## Tables Table 1: Sensor Height on Towers ............................................................................................. ...................................... 2 Table 2: System Accuracies and Resolution .................................................................................... ................................ 3 Table 3: System Performance and Data Custody Forms ........................................................................... ...................... 5 Table 4: System Components ................................................................................................... ....................................... 6 Table 5: Sampling Frequency .................................................................................................. ...................................... 12 Table 6: Scheduled Sampling Activities ....................................................................................... .................................. 13 Table 7: Project Quality Control Checks ...................................................................................... .................................. 15 Table 8: Preventive Maintenance Schedule ..................................................................................... .............................. 16 Table 9: Calibration Equipment Testing ....................................................................................... .................................. 17 Table 10: Data Recorded on Site .............................................................................................. ..................................... 20



## Figures Figure 1: HCN Sampling System Flow Diagram - Static Mode ..................................................................... ................... 9 Figure 2: HCN Sampling System Flow Diagram - Warm-Up Mode .................................................................... ........... 10 Figure 3: HCN Sampling System Flow Diagram - Sampling Mode Sorbent Tube 1 .................................................... .. 11



## Appendices Appendix A: NIOSH Method 6010Hcn Sampling Plan_V7.Docx 

### 1 

### SECTION 1 

# PROJECT MANAGEMENT ELEMENTS 1.1 Sampling Purpose This sampling plan is being developed to determine the levels of hydrogen cyanide (HCN) in ambient air at the fence line of a mine site. This plan describes the general HCN sampling equipment, collection methods, and data recording procedures. Separate site-specific plans will be submitted for individual mine sites where HCN monitoring will take place. The site-specific plans will be in accordance with this general plan unless otherwise noted, in which case the specific plan will take precedence. There is currently no EPA method for measuring trace levels of HCN in ambient air. The method described in this monitoring plan was develope d using some elements of both EPA and NIOSH sampling and analytical guidelines. Meteorological parameters will be collected. In addition, an optional video surveillance system may be deployed to determine the operability of the sampler as well as identify any unusual conditions at the sampler. The design of the system uses elements of U.S. EPA Quality Assurance Handbook of Air Pollution Measurement Systems Volume II as well as the NIOSH Manual of Analytical Methods, Method 6010. All meteorological parameters will be collected consistent with U.S. EPA Quality Assurance Handbook of Air Pollution Measurement System s Volume IV - Meteorological Measurements (EPA600/R94-038D), March 1995, and as provided in this plan. 

# 1.2 System Description The system will consist of a data logger connected to a low-flow pump which is connected through sorbent tubes to an ambient air inlet. The sorbent tubes will capture any HCN in the ambient air and will be sent to a certified lab for analysis. The sampling schedule will follow a 1- in-3 day calendar for a period of two months. During a run day, all parameters will be collected every two seconds and time-averaged into 15-minute values. The parameters collected are shown in Table 1. Wind speed, wind direction, ambient temperature, relative humidity, and barometric pressure are collected as well as flow rate through the sorbent tubes. The measurement height of the inlet is two meters. The height of the wind instruments will be 3.5 meters. All other parameters are measured at 2 meters.Hcn Sampling Plan_V7.Docx 

### 2 Table 1: Sensor Height on Towers (meters above ground)



### Parameter Height Wind speed 3.5 Wind direction 3.5 Ambient temperature 2 Relative humidity 2 Barometric pressure 2 Sampler Flow 2Hcn Sampling Plan_V7.Docx 

### 3 

### SECTION 2 

# QUALITY OBJECTIVES AND CRITERIA FOR DATA MEASUREMENT 2.1 Data Quality Objectives and Criteria The primary quality objectives are taken from EPA guidance where applicable. The following tables present the guidelines for each sensor as well as the relevant references for each. Table 2: System Accuracies and Resolution

Parameter Sensor* Range Accuracy Standard Measurement Resolution Reference Wind direction R.M. Young 05305-AQ Range: 0 ° to 360 ° + 3 ° Accuracy: + 5 ° 1.0 ° EPA-454/4-87-007 Section 6.1.1, EPA-454/R-99-005, February 2000, Table 5-1 Wind speed R.M. Young 05305-AQ 0.4 to 45 m/s + 0.2 m/s Accuracy: + 0.25 m/s

up to speeds of 5

m/s and

+ 5% thereafter 0.1 m/s EPA-454/4-87-007 Section 6.1.1 EPA-454/R-99-005, February 2000, Table 5-1 Ambient temp. Campbell Scientific Model HMP45C -39.2 ° C to +60 ° C + 0.3 ° + 0.5 ° C 0.1 ° C EPA-454/4-87-007 Section 6.1.5 EPA-454/R-99-005, February 2000, Table 5-1 Relative humidity Campbell Scientific Model HMP45C 0.8 to 100% + 2% (0-90% RH) and + 3% (90- 100% RH) 1.5 ° C dew point temperature error 1% EPA-454/4-87-007 Section 6.1.4 EPA-454/R-99-005, February 2000, Table 5-1 Barometric pressure Vaisala PT101B -40 ° C to 60 ° C + 0.5 mb + 3 mb + 0.1 mb EPA-454/4-87-007 Section 6.1.7 EPA-454/R-99-005, February 2000, Table 5-1 Flow rate Pressure transducer N/A + 5% + 10% of observed 0.1 l/min N/A * Or equivalent sensor.Hcn Sampling Plan_V7.Docx 

### 4 

### SECTION 3 

# SPECIAL TRAINING REQUIREMENTS/CERTIFICATION The monitoring equipment should be operated unde r the guidance of the Project Technician. The Project Technician will receive training in the equipment operation. Any non-routine work on this system must be conducted by a qualified technician.Hcn Sampling Plan_V7.Docx 

### 5 

### SECTION 4 

# DOCUMENTATION OF RECORDS All of the forms which will be used to document the system performance and data custody are listed in Table 3. Table 3: System Performance and Data Custody Forms



### Component Hard Copy or Electronic Copy Comments Site Check Form Hard Copy Include check of flow and meteorological sampling. Chain of Custody Form Hard Copy Record handling of sorbent tube through analytical process. Site-Specific Journal Record Hard Copy and Electronic Copy Record any anomalous occurrences. Flow Audit Hard Copy and Electronic Copy Conduct at end of 2 month sampling period. 

# 4.1 Data Reporting Package Format and Documentation Control A report will be prepared and submitted to EPA within 30 days of the conclusion of the data collection program. The report will contain:

• A calculation of the percentage of valid data collected with an explanation of any instrument malfunction for each parameter,

• All valid hourly meteorological data,

• All valid flow data,

• All HCN concentrations determined by laboratory analysis,

• Copies of Site Check Forms,

• Copies of any calibrations and audits performed,

• Anecdotally conveyed no tes and anomalies, and

• Corrective actions taken (if any). After the first four weeks of sampling, prelim inary data will be supplied to EPA after the analyses are received from the laboratory.Hcn Sampling Plan_V7.Docx 

### 6 

### SECTION 5 

# DATA GENERATION AND ACQUISITION 5.1 Sampling Process Design and Methods Requirements 5.1.1 Purpose The monitoring requirements subject to EPA an d federal guidelines are strictly defined for meteorology but not for HCN. The equipment se lection and operation of the station is in accordance with available guidelines. In cases where an existing meteorological station at the mine meets all applicable guidelines, this station may be used in lieu of the meteorological equipment specified herein. The site-specific pl an submitted by each mine will address the proposed location of the meteorological monito ring station that will be used to provide meteorological data for the ambient fence line monitoring program. 

# 5.1.2 Sampling Network DesignThe monitoring system will consist of the following parts, or equivalent, as specified in the sitespecific plan. Each part will have a serial number and will be calibrated upon installation. Table 4: System Components



### Item Manufacturer Model Name Enclosure Campbell Scientific ENC 12/14 3-meter tower Campbell Scientific 25G Wind sensor mount Campbe ll Scientific 019ALU Pyranometer mounting arm Campbell Scientific 015ARM Data logger CR3000 Campbell Scientific CR23X or CR10X Power supply with battery Ca mpbell Scientific PS12LA Solar panel Campbell Scientific MSX10R Wind sensor R.M. Youn g Wind Monitor 05305-AQ Wind sensor cable R.M. Young Solar power system Kyocera Solar Electric System Temperature and relative humidity sensor Campbell Scientific HMP45C Barometric pressure sensor Vaisala PT101B Flow meter Newark Electronics TE525 Flow meter Newark Electronics Pressure TransducerHcn Sampling Plan_V7.Docx 

### 7 

# 5.1.3 Equipment Description The following section describes the air quality and meteorological instrumentation that will be used for the HCN monitoring program. The inst rumentation is selected consistent with the requirements of:

• U.S. EPA Quality Assurance Handbook of Air Pollution Measurement Systems Volume II, September 1997.

• NIOSH Manual of Analytical Methods, Method 6010, August 1994 .

• U.S. EPA Quality Assurance Handbook of Air Pollution Measurement Systems Volume IV - Meteorological Measurements (EPA-454/B-08-002), March 2008. The data collection systems are designed to ex ceed the recommended quarterly data recovery rate of 90 percent for all meteorological parameters and 75 percent for HCN. 

# 5.1.4 Data Logger A Campbell Scientific, Inc. Model CR3000 data logger is used as the digital acquisition system for the stations. The data logger records the data every two seconds, computes 15-minute averages of each of the meteorological parameters, and stores the averages in its internal memory. The CR3000 has 4 mB of Flash Electrically Erasable Programmable Read Only Memory (EEPROM) for the operating system and user programs. It also has 512K of Static Random Access Memory (SRAM) used for storing approximately three months of data and running the program. It has a 16-bit micro-controller with 32-bit internal CPU ar chitecture. The resolution and accuracy of the analog inputs are 6.67 microvolts and ± 0.04%, respectively. The CR3000 is equipped with a solidstate storage module. The 15-minute averages are written to the CR3000's internal memory and to the external storage module. The storage module can store nearly six mo nths of data and will provide a backup of the data and the CR3000 prog ram in the unlikely event of a power loss. The data logger is designed to operate in temperatures from –25 ° C to 50 ° C. 

# 5.1.5 Wind Speed Wind speed is continuously measured using an R.M. Young Model 05305 sensor interfaced directly to the data logger. The wind speed sens or of the Model 05305 is a helicoid-shaped, fourblade propeller. Rotation of th e propeller produces an AC sine wave; the frequency is directly proportional to the wind speed. The AC signal is induced in a transducer coil by a six-pole magnet mounted on the propeller shaft. The coil is located on the non-rotating central portion of the main mounting assembly, eliminating the need for slip rings and brushes. Power for the sensor is supplied by the data logger. The Model 05305 has a range of 0.4 - 45 m/s, a starting threshold of 0.4 m/s, an accuracy of 0.2 m/s, and a distance constant of 2.1 meters.Hcn Sampling Plan_V7.Docx 

### 8 

# 5.1.6 Wind Direction Wind direction is also continuously measured using an R.M. Young Model 05305 sensor interfaced directly to the data logger. The Model 05305 sensor provides a 1 ° to 360 ° format through the use of a precision potentiometer powered by the data logger. The potentiometer outputs a varying voltage proportional to the wind direction in degrees. The sensor is constructed from lightweight thermoplastic materials to give it a starting threshold of less than 0.5 m/s. The sensor has an accuracy of ±3 ° , a damping ratio of 0.45, and a delay distance of less than 2 meters. 

# 5.1.7 Temperature Sensor and Radiation Shield The temperature measurements are continuously monitored using a Campbell Scientific HMP45C Platinum Resistance Temperature (PRT) detector. Temperature is measured by the data logger as a varying resistance across a platin um resistor that is proportional to the ambient temperature. The range of the sensor is –40°C to +60°C. The radiation shield for the temperature sensor prevents interference from solar radiatio n. The radiation error is less than 0.1°F. 

# 5.1.8 Relative Humidity Relative humidity is continuously measured using a Campbell Scientific Model HMP45C sensor. The HMP45C contains a Vaisala HUMICAP TM 

### 180 capacitive relative humidity sensor. The HMP45C sensor is housed inside a non-aspirated shield. Relative humidity is measured by the data logger as an output voltage. The range of the sensor is from 0.8 to 100% (non-condensing) with an accuracy of ±2% when the humidity is less than 90%, and ±3% when the humidity is greater than 90%. The response time for th e relative humidity sensor is 15 seconds. 

# 5.1.9 Barometric Pressure Barometric pressure is measured every 15 minute s using a Vaisala PT101B sensor. The sensor is mounted inside the data logger enclosure. Barome tric pressure is measured by the data logger using Vaisala’s Barocap silicon capacitive pressu re sensor, which outputs a linear 0 to 2.5 VDC signal. The operating range of the sensor is –40 ° C to 60 ° C. The CS105 has a warm-up time of one second, an uncertainty of 0.15 millibar, and a linearity of 0.45 millibar. 

# 5.1.10 HCN Sampling System This instrument is designed to measure HCN at trace levels in ambient air. There is currently no EPA certified method for this determination. Th e design combines elements of EPA air quality measuring guidelines along with NIOSH sampling protocols. The sampler consists of soda lime sorbent tubes (SKC part number 226-28) connected to a glass inlet. On the other side of the sorbent tubes is a low flow pump controlled by a data logger via a feedback loop with a pressure transducer. The flow is regulated by a critical orifice, and ambient meteorological parameters are collected to determine the exact volume of gas pass ed through the sorbent tubes. Data collection is in twenty-four hour increments. Upon complete exposure of a sorbent tube, it is sealed andHcn Sampling Plan_V7.Docx 

### 9 

### shipped to a certified laboratory for analysis in accordance with NIOSH Method 6010. The complete NIOSH Method 6010 is included as Appendix A. 

## 5.1.10.1 Operating Principle As discussed above, the HCN sampling system consis ts of an open-air inlet, sorbent tubes, and a pump which pulls air through the sorbent tubes at a rate of 1 liter per minute. The system is designed to hold two or more sorbent tubes, where each tube will collect a 24-hour sample. Based on the 1-in-3 day schedule, a site visit to change out the tubes will be required every 5-7 days (or longer if more than two tubes are design ed into the system). The total volume of air pulled through each sorbent tube is 1,440 liters. This exceeds the recommended total volume of NIOSH Method 6010 but is within the capture volu me of the sorbent tube and necessary to reach the required limits of detection. A data logger turns the pump on and off and cont rols the solenoid valve according to the 1-in-3 day schedule. The solenoid valve opens and closes to allow air to pass through a sorbent tube only during a run day. The data logger al so records ambient barometric pressure and temperature to calculate the volume of air passed through the sorbent tube during the run day. Flow diagrams of the HCN sampling system, show ing the system in static mode, warm-up mode, and sampling mode, are provided in Figures 1 through 3. Figure 1: HCN Sampling System Flow Diagram - Static Mode INLET

SOLENOID VALVE

SORBENT TUBE 1



### PRESSURE TRANSDUCER PUMP

POWER RELAY 

### POWER 

### OUTLET DATA LOGGER

BAROMETRIC PRESSURE TEMPERATURE SORBENT TUBE 2



### CHECK VALVE 

### CALIBRATION VALVEHcn Sampling Plan_V7.Docx 

### 10 Figure 2: HCN Sampling System Flow Diagram - Warm-Up Mode

INLET

SOLENOID VALVE

SORBENT TUBE 1



### PRESSURE TRANSDUCER PUMP

POWER RELAY 

### POWER 

### OUTLET DATA LOGGER

BAROMETRIC PRESSURE TEMPERATURE SORBENT TUBE 2



### CHECK VALVE 

### CALIBRATION VALVEHcn Sampling Plan_V7.Docx 

### 11 Figure 3: HCN Sampling System Flow Diagram - Sampling Mode Sorbent Tube 1



### On a run day, at 15 minutes before the sampling commences, the data logger turns the pump on and switches the solenoid valve to allow air to flow around the sorbent tubes and through the pump. This gives the pump time to warm up and ensures that the air in the inlet is homogenous when the sampling begins. To initiate sampling, the data logger switches the solenoid valve to allow air to flow through the first sorbent tube an d the sampling begins. After 24 hours, the data logger closes the solenoid valve, stopping flow to the sorbent tube, and turns the pump off. On the next run day, after the warm-up period, to initiate sampling, the data logger switches the solenoid valve to allow air flow through the second sorbent tube. After 24 hours, the data logger closes the solenoid valve, stopping flow to the second sorbent tube. The tubes are replaced before the next run day and the sampling process repeats. After the 24-hour sampling is complete, each sorbent tube is sealed and shipped to a certified laboratory where the HCN is extracted and anal yzed using spectroscopy. One in every five sorbent tubes will be a field bl ank. The blank tubes will follow the same path as the sampled tubes, with the exception of being inserted into the sampling system. INLET

SOLENOID VALVE

SORBENT TUBE 1



### PRESSURE TRANSDUCER PUMP

POWER RELAY 

### POWER 

### OUTLET DATA LOGGER

BAROMETRIC PRESSURE TEMPERATURE SORBENT TUBE 2



### CHECK VALVE 

### CALIBRATION VALVEHcn Sampling Plan_V7.Docx 

### 12 

### The detection limit for this HCN sampling method is reported to be approximately 0.2 ppb 1 

### , which is an order of magnitude less than the EPA reference concentration of 2.8 ppb. 

# 5.1.11 Power and Data Transfer Solar power is used to operate the equipment. The data logger is powered separately via a smaller solar cell to prevent total data and commu nications loss during periods of power loss. A cellular Internet modem is installed providing real-time satellite communications. 

# 5.1.12 Meteorological Towers A 10-foot Rohn 25G meteorological tower will be installed for the purpose of mounting the sensors. The tower will be grounded, and lightning protection will be installed on all signal lines. 

# 5.2 Rationale for Design The equipment has been selected based on its conformity to current EPA standards for meteorology and current NIOSH standards for HCN monitoring. 

# 5.3 Scheduled Measurement Activities The sampler pump will be activated on 1-in-3 da y schedule. During this period all parameters, with the exception of HCN concentration, will be collected every two seconds. This is summarized in Table 5 and Table 6. Table 5: Sampling Frequency



### Parameters Engineering Units Sampling Rate Averaging Rate Number of Samples per 24-Hour Period Wind speed Meters/second Every 2 seconds Every 15 minutes 96 Wind direction Degrees Every 2 seconds Every 15 minutes 96 Ambient temperature and relative humidity Degrees Celsius and percent Every 2 seconds Every 15 minutes 96 Barometric pressure Millibar Every 2 seconds Every 15 minutes 96 HCN sampler flow Liters/minute Every 2 Seconds Every 15 minutes 96 HCN concentration* Parts per billion Every 24 hours Every 24 hours 1 *HCN concentration can only be determined upon completion of laboratory analysis.

1 Kenneth G. Orloff et al., Hydrogen cyanide in ambient air near a gol d heap leach field: Measured vs. modeled concentrations, Atmospheric Environment, 2006, p. 3023.Hcn Sampling Plan_V7.Docx 

### 13 Table 6: Scheduled Sampling Activities



### Activity Frequency Required Personnel Site Check Every 5-7 days Maintenance Technician Calibration At installation Project Technician Flow Audit At close out Auditor 

# 5.4 Measurement Syst em Failure Response The primary mechanism for ensuring normal sy stem operation will be comprised of on-site checks conducted after the tubes have been sample d and before the next run day. The site check schedule will be every 5-7 days (or longer if more than two tubes are designed into the system). The Maintenance Technician is responsible for on-site checks and completion of Site Check Forms. Any issues that are detected during the site checks will be resolved as soon as possible. If a run day sampling is missed or incomplete, a substitute 24-hour sampling can be used if it is completed before the next scheduled run day.Hcn Sampling Plan_V7.Docx 

### 14 

### SECTION 6 

# SAMPLING METHOD REQUIREMENTS 6.1 Sample Handling and Custody Requirements A new sorbent tube will be inserted into the sampler system prior to midnight of a run day. After completion of the run, the sorbent tube will be removed and prepared for shipment to a certified lab. All sorbent tubes used for sampling will be tracked in a Chain of Custody Form. 

# 6.2 Analytical Methods Requi rements and Breakthrough Check The sample will be digested at the lab and a coloring agent will be added to make the cyanide spectroscopically active. UV/Vis spectroscopy will be employed to determine the cyanide concentration. The quantity of cyanide present will be combined with the known flow of the sample exposure to generate a 24-hour HCN sample concentration. The analysis will be conducted in accordance with NIOSH Me thod 6010 (included as Appendix A). As part of the HCN analysis, each tube will be checked for breakthrough. The sorbent tubes consist of a front half and back half. Each half will be analyzed separately to determine the mass of cyanide. Any sample where the mass of cyanid e in the back half is greater than one-tenth of the mass of cyanide in the front half will be flagged indicating that breakthrough has occurred. 

# 6.3 Quality Control Requirements Quality control for the program will be affected through the use of site checks, post-installation calibration, and close out audits. Information pr ovided by each of these methods is documented in the Table 7 below.Hcn Sampling Plan_V7.Docx 

### 15 Table 7: Project Quality Control Checks



### QC Check Information Provided Frequency Site Checks All information about the station status, which cannot be determined from the raw data. Additionally, it provides real-time data for comparison with hourly averages to insure that station is functioning within prescribed guidelines. Every 5-7 days

Calibrations Determines the serviceability, accuracy, and precision of the equipment operating on site. Sensors are tested over a full range of operating conditions to ensure that they are performing within prescribed guidelines. At installation

Flow Audit Determines the serviceability, accuracy, and precision of the equipment operating on site. Sensors are tested over a full range of operating conditions to ensure that they are performing within prescribed guidelines. At close outHcn Sampling Plan_V7.Docx 

### 16 

### SECTION 7 

# INSTRUMENT/EQUIPMENT TESTING, INSPECTION, AND MAINTENANCE REQUIREMENTS The sensor/equipment maintenance schedule is based on the manufacturer’s guidelines. All routine maintenance tasks will be accomplishe d by the Project Technician. In addition, preventive maintenance tasks are summarized in Table 8. Table 8: Preventive Maintenance Schedule



### Parameter Sensor Replacement Frequency Wind speed and direction R.M. Young 05305-AQ Every 2 years. Temperature/relative humidity Campbe ll Scientific HMP45C Every 2 years. Barometric pressure Vaisala PT101B Every 2 years. Sampling pump SKC Low Flow Pump to be refurbished annually. *Due to the duration of the sampling program, it is anticipated that preventive maintenance will not be needed. 

# 7.1 General Procedures The Project Technician will review the Site Chec k Forms and compare them to the 15-minute data averages to ensure proper syst em operation and data transfer. 

# 7.2 Instrument Calibration and Frequency The following section outlines the preventive ma intenance/recalibration of the equipment used to test the performance of the on-site systems. 

# 7.2.1 Calibration Eq uipment Maintenance The identity, frequency, and governing standard for all calibration equipment can be found in Table 9.Hcn Sampling Plan_V7.Docx 

### 17 Table 9: Calibration Equipment Testing



### Parameter Calibration Equipment Calibration Frequency Reference Wind speed Anemometer Drive 200 to 15,000 RPM Biannually EPA 600/R-94/038D, Section 4.2.2 Wind direction Degree Wheel N/A EPA 600/R-94/038D, Section 4.2.2 Temperature Temperature Standard Annually EPA 600/R-94/038D, Section 4.3.2 Barometric pressure Altimeter N/A EPA 600/R-94/038D, Section 4.6 Relative humidity Collocated HMP45C Biannually EPA 600/R-94/038D, Section 4.6 Data logger Voltmeter Annually EPA 600/R-94/038D, Section 4.1.4.1 Flow Flow Meter Annually N/A The equipment supplier will be required to maintain calibration equipment certifications in hard copy. 

# 7.2.2 Calibration Reco rds and Traceability Calibration Forms are completed and maintained by project personnel. All Calibration Forms indicate the sensor calibrated, its serial numb er, the date calibrated, and any other pertinent information/anomalies.Hcn Sampling Plan_V7.Docx 

### 18 

### SECTION 8 

# INSPECTION/ACCEPTANCE REQUIREMENTS FOR SUPPLIES AND CONSUMABLES The only consumable used in this process is the sorbent tubes. All tubes will be inspected upon receipt. Any tubes which show signs of physical damage will be discarded. Documentation sent with the maintenance items are kept on file as they apply to each sensor and its serial number.Hcn Sampling Plan_V7.Docx 

### 19 

### SECTION 9 

# DATA MANAGEMENT The data will be collected and stored in the da ta logger and backed up in the on-site storage module. The data can be automatically or manually transferred to the user’s database. The data will then be quality controlled/quality assura nce checked (QA/QC’d) and stored on a server. 

# 9.1 Data Custody Data retrieval, quality control, and processing will be documented. Site Check Forms and all other program documentation will be archived. Additionally, a journal will be kept to record any anomalous occurrences.Hcn Sampling Plan_V7.Docx 

### 20 

### SECTION 10 

# DATA VALIDATION AND USABILITY 10.1 Data Review, Validation, and Certification 10.1.1 Data Validation The data will be reviewed, quality controlled/quality assurance checked (QA/QC’d), and validated in accordance with EPA guidelines. 

# 10.1.2 Data Collection Data received from the site will consist of 15-minute averages for all parameters. A complete list of parameters from the site can be found in Table 10. Table 10: Data Recorded on Site



### Parameter Units Frequency Array ID N/A Every 15 minutes Year -- Every 15 minutes Day Julian Day Every 15 minutes Time Hour/Minute Every 15 minutes Wind speed Meters/Second Every 15 minutes Wind direction Degrees from Every 15 minutes Wind direction standard devi ation None Every 15 minutes Barometric pressure Millibar Every 15 minutes Relative humidity Percent Every 15 minutes Ambient temperature Degrees Celsius Every 15 minutes Data logger battery voltage DCV Every 15 minutes SIN wind direction None Every 15 minutes COSINE wind direction None Every 15 minutes Flow l/min. Every 15 minutes 

# 10.1.3 Data Reduction On-site data is collected every two seconds and pl aced into temporary storage. Every 15 minutes the data is reduced and stored in the ring memory of the data logger. The wind speed, temperature, relative humidity, barometric pressure, and flow data are reduced as scalar averages using the equation below. 

# ∑ = N i 

## u N u 1 

## 1 The wind direction data is reduced as a unit vector according to the following equations.Hcn Sampling Plan_V7.Docx 

### 21 

# ∑ = N i S 

## Sin N V 1 

## 1 θ 

# ∑ = N i C 

## Cos N V 1 

## 1 θ



## X V V ArcTan C S 

## + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = θ If Vc < 0 then X = +180 If Vs < 0 then X = +360 If Vs > 0 then X = +0 The wind direction deviation is reduced using the Yamartino algorithm found below. 

# ( ) ( ) 

# [ ] 3 

## 1547 . 0 1 1 ε ε θ σ + = ArcSin where, 

# () () 

# ( ) 

# [ ] 2 1 2 2 

## 1 C S 

## V V + − = ε and Vs and Vc are as defined above. After the 15-minute data has been downloaded, it is processed into one-hour averages using the same equations listed above. 

# 10.2 Validation Methods 10.2.1 Data Review and Validation Requirements The data review and validation requirements follow the protocols outlined in Section 5 of this monitoring plan. The validation is accomplished by using quality control standards based on federal and manufacturer’s guidelines as well as expected sampler performance. If a quality control standard is not met, the data will be flagged initially, and the causes immediately investigated. All data, which is found to be invali d, will be removed from the data set. All data, which is subsequently proven to be valid, will be processed for inclusion in the reports.

# APPENDIX A 

# NIOSH Method 6010

## HYDROGEN CYANIDE 6010 

## HCN MW: 27.03 CAS: 74-90-8 RTECS: MW6825000 METHOD: 6010, Issue 2 EVALUATION: FULL Issue 1: 15 May 1989 Issue 2: 15 August 1994 OSHA : 10 ppm (skin) NIOSH: STEL 4.7 ppm ACGIH: C 10 ppm (skin)

(1 ppm = 1.105 mg/m 3 @ NTP) PROPERTIES: gas; BP 26 °C; vapor density 0.93 (air = 1.00); d(liq) 0.69 g/mL @ 20 °C; VP 82.7 kPa (620 mm Hg) @ 20 °C; explosive range 5 to 40% v/v in air SYNONYMS: hydrocyanic acid, prussic acid, formonitrile SAMPLING SAMPLER: SOLID SORBENT TUBE

(soda lime, 600 mg/200 mg) FLOW RATE: 0.05 to 0.2 L/min VOL-MIN: 2 L @ 5 ppm -MAX: 90 L SHIPMENT: routine SAMPLE STABILITY: at least 2 weeks @ 25 °C [1] BLANKS: 2 to 10 field blanks per set MEASUREMENT TECHNIQUE: SPECTROPHOTOMETRY,

VISIBLE ABSORPTION ANALYTE: cyanide ion complex DESORPTION: 10 mL deionized water; stand 60 min COLOR DEVELOPMENT: N-chlorosuccinimide/ succinimide oxidizing agent and barbituric acid/pyridine coupling agent; absorption @ 580 nm in 1-cm cuvette CALIBRATION: standard solutions of KCN in 0.1 N NaOH RANGE: 10 to 300 μg CN - per sample [1] ESTIMATED LOD: 1 μg CN - per sample [1] PRECISION ( S r ): 0.041 @ 10 to 50 mg per sample [1] ACCURACY RANGE STUDIED: 2 to 15 mg/m 3 [1] (3-L samples) BIAS: Not significant OVERALL PRECISION ( S ˆ rT ): 0.076 [1] ACCURACY: ± 15.0% APPLICABILITY: The working range is 0.3 to 235 ppm (3 to 260 mg/m 3 ) for a 3-L air sample. This method is applicable to STEL measurements. Particulate cyanides are trapped by the initial glass fiber membrane disk. This method is more sensitive a nd subject to fewer interferences than NIOSH Method 7904, which uses ion specific electrode analysis. The method was used t o determine HCN in firefighting environments [2]. INTERFERENCES: A high concentration of hydrogen sulfide gives a negative interference. OTHER METHODS: This is based on the method of Lambert, et al. [3]. NIOSH Method 7904 uses an ion specific electrode for measurement. The method has been adapted for use with a Technicon Autoanalyzer [4].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94

### HYDROGEN CYANIDE: METHOD 6010, Issue 2, dated 15 August 1994 - Page 2 of 5

SAMPLING: REAGENTS: 1. Potassium cyanide*, reagent grade. 2. Succinimide, reagent grade. 3. N-Chlorosuccinimide, reagent grade. 4. Barbituric acid, reagent grade. 5. Pyridine, spectrophotometric quality. 6. Phenolphthalein, 1% (w/v) in ethanol or methanol, reagent grade. 7. Hydrochloric acid, concentrated, reagent grade. 8. Sodium hydroxide (NaOH), reagent grade.* 9. Sodium lime (CaO + 5-20% NaOH), reagent grade (Aldrich #26,643-4 or equivalent). Crush and sieve to 10/35 mesh. Store in capped container.* 10. Water deionized-distilled. 11. Sodium hydroxide solution, 0.1 N .* 12. Calibration stock solution. 1 mg /mL CN - 

### . Dissolve 0.125 g KCN in 0.1 N NaOH in a 50- mL volumetric flask. Dilute to mark with 0.1 N NaOH. Standardize by titration with standard AgNO 3 

### solution (see APPENDIX). 13. Hydrochloric acid solution, 0.15 N . 14. N-Chlorosuccinimide/succinimide oxidizing reagent. Dissolve 10.0 g succinimide in about 200 mL distilled water. Add 1.00 g Nchlorosuccinimide. Stir to dissolve. Adjust volume to 1 liter with distilled water. Stable 6 months when refrigerated. 15. Barbituric acid/Pyridine reagent. Add about 30 mL distilled water to 6.0 g barbituric acid in a 100-mL Erlenmeyer flask. Slowly add 30 mL pyridine with stirring. Adjust the volume to 100 mL with water. Stable 2 months when refrigerated. EQUIPMENT: 1. Sampler, glass tube, 9 cm long, 7-mm OD, 5-mm ID, with plastic caps, containing two sections (front = 600 mg; back = 200 mg) granular soda lime 10/35 mesh, separated and contained with silanized glass wool plugs, with a 5-mm diameter glass fiber filter disk placed before the plug on inlet side. Tubes are commerically available. (SKC, Inc. 226-28 or equivalent.) 2. Spectrophotometer, visible, 580 nm, with cuvettes, 1-cm light path. 3. Personal sampling pump, 0.05 to 0.2 L/min, with flexible connecting tubing. 4. Pipets, volumetric 0.1-, 0.5-, 1.0-, 2.0-, 10.0-mL. 5. Vials, glass or plastic, 15-mL with PTFE-lined caps. 6. Flasks, volumetric, 25-, 50-, 100-, 1000-mL, with stoppers. 7. Pipets, transfer, disposable. 8. Syringes, 10-μL, readable to 0.1 μL. 9. Flask, Erlenmeyer, 100-mL. 10. Syringes, 10-mL, polyethylene with luer tip. 11. Filter cassette, with membrane filter, 13-mm diameter, 0.45-μm pore size, with luer fitting. * See SPECIAL PRECAUTIONS

SPECIAL PRECAUTIONS: HCN gas and cyanide particulates are highly toxic and may be fatal if swallowed, inhaled, or absorbed through the skin [5]. Soda lime and NaOH are very caustic [5]. Use gloves and a fume hood for handling these chemicals. 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Break ends of sampler immediately before sampling. Attach sampler to personal sampling pump with flexible tubing. 3. Sample at an accurately known flow rate between 0.05 and 0.2 L/min for a total sample size of 0.6 to 90 L. 4. Cap tube. Pack securely for shipment.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94

### HYDROGEN CYANIDE: METHOD 6010, Issue 2, dated 15 August 1994 - Page 3 of 5

SAMPLE PREPARATION: 5. Score each sampler with a file. Break sampler at score line. 6. Transfer front and back sorbent sections to separate vials. Discard glass wool plugs separating and retaining sorbent sections. NOTE: An estimate of particulate cyanide may be obtained by analyzing the initial glass fiber filter disk as follows; however, no evaluation data are available for particulate cyanides determined in this manner. (i) Transfer the glass wool plug at the tube inlet and the glass fiber filter disk immediately behind it to a third vial. (ii) Add 10.0 mL 0.1 N NaOH to each vial. (iii) Proceed with step 8. 7. Add 10.0 mL deionized-distilled water to each vial containing a sorbent section. Cap each vial. 8. Allow to stand 60 minutes, with occasional agitation. Transfer to a 10-mL plastic syringe fitted with an in-line 0.45-μm filter. Collect the filtrate in a clean vial. CALIBRATION AND QUALITY CONTROL: 9. Calibrate daily with at least six working standards over the range 1 to 300 μg CN - 

### per sample. a. Prepare a working standard solution, 1.00 μg /mL.CN - 

### , by diluting 100 μL of calibration stock solution to 100 mL with 0.1 N NaOH. b. Pipet 0.5-, 1.00-, 1.50-, 2.00- and 2.50-mL of the working standard solution into 25-mL volumetric flasks to make 0.50-, 1.00-, 1.50-, 2.00- and 2.50- μg CN - 

### standards. c. Analyze together with field samples and blanks (steps 12 through 19). d. Prepare calibration graph (absorbance vs. μg CN - 

### ). 10. Determine desorption efficiency (DE) at least once for each lot of soda lime used for sampling. Prepare at least three tubes at each of five levels plus three media blanks. a. Remove and discard back sorbent section of a blank sampler. b. Inject a known amount of calibration stock solution directly onto the soda lime with a microliter syringe. c. Cap, and allow to stand overnight. d. Desorb (steps 5 through 8) and analyze together with working standards and blanks (steps 12 through 19). e. Prepare a graph of DE vs. μg CN - 

### recovered. 11. Analyze three quality control blind spikes and three analyst spikes to ensure that the calibration graph and DE graph are in control. MEASUREMENT: 12. Set spectrophotometer according to manufacturer's recommendations and to conditions on p. 6010-1. 13. Pipet a sample aliquot estimated to contain 0.5 to 2.5 μg CN - 

### into a 25-mL volumetric flask. Alternately, to cover an unknown sample concentration range, pipet 0.5-, 1.00-, and 3.00-mL aliquots into separate 25-mL vol. flasks for each field sample. Larger or smaller aliquots may be taken, based on prior knowledge of expected analyte level. 14. Pipet 0.5 mL 0.1 N NaOH into a 25-mL volumetric flask for reagent blank. 15. Add one drop phenolphthalein solution to each standard or sample. NOTE: Add a little deionized-distilled water to increase volume for easier mixing. All solutions should be alkaline (pink) at this point. 16. Starting with the reagent blank, add dropwise 0.15 N HCl, with mixing, until pink color just disappears. CAUTION: HCN may be produced. Work in hood. Immediately add 1.0 mL N-chlorosuccinimide/succinimide oxidizing reagent. Mix and let stand.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94

### HYDROGEN CYANIDE: METHOD 6010, Issue 2, dated 15 August 1994 - Page 4 of 5 NOTE 1: To avoid possible loss of HCN, add the oxidizing agent before proceeding to the

next sample. NOTE 2: Do not prepare more samples than can be analyzed within the 30-minute maximum

time for color development. 17. After at least 5 min. standing (but not longer than 15 min), starting with the reagent blank, add 1.0-mL barbituric acid-pyridine coupling reagent. Mix. 18. Adjust sample volume to 25 mL with deionized-distilled water and allow to stand at least 12 min (but not longer than 30 min) for color development. 19. Read absorbance at 580 nm in a 1-cm light path cuvette on a spectrophotometer. If sample absorbance is outside the range of the calibration standards, take an aliquot, re-analyze (steps 12 through 19), and apply the appropriate aliquot factor in calculations. CALCULATIONS: 20. Calculate the mass, μg, of CN - 

### in aliquot analyzed. Apply the appropriate aliquot factor to calculate the mass, μg, of CN - 

### in the original 10-mL solution. 21. Determine the mass, μg CN - 

### (corrected for DE), found in the sample front (W f 

### ) and back (W b 

### ) sorbent sections and in the average media blank front (B f 

### ) and back (B b 

### ) sorbent sections. If W b 

### > W f 

### /10, report breakthrough and possible sample loss. 22. Calculate concentration, C, of HCN in the air volume sampled, V(L).

where 1.039 = conversion factor, CN - 

### to HCN EVALUATION OF METHOD: The method was evaluated by sampling the test atmospheres of HCN generated from a compressed mixture of HCN in nitrogen [1]. The range of HCN concentration was equivalent to 2 to 15 mg/m 3 

### for a 3-L air sample. Twenty-two samples collected at 0.2 L/min for 15 minutes indicated overall precision S ˆ rT 

### of 0.076 with nearly 100% recovery. Breakthrough occurred after 40 minutes of sampling at the flow rate of 0.2 L/min at an HCN concentration of 148 mg/m 3 

### . Sample tubes spiked with solutions of KCN and analyzed after storage, indicated that the samples of cyanide ions were stable on the tube for at least 2 weeks. Analysis of 22 tubes which were spiked with KCN standard solutions in the range 10 to 50 μg indicated a recovery of nearly 100% with a pooled precision of 0.041. Desorption efficiency may be poor below 10 μg CN - 

### [6]. REFERENCES: [1] Williamson, George. "Method Development Protocol and Backup Data Report on Hydrogen Cyanide" Internal NIOSH/MRSB Report, Unpubl. NIOSH (1988). [2] Williamson, George. "Analysis of Air Samples on Project 166 (Firesmoke) on HCN; Sequence NIOSH/MRSB-6366A, Unpubl. NIOSH, (1988). [3] Lambert, J. L., Ramasamy, J., and J. V. Paukstelis, "Stable Reagents for the Colorimetric Determination of Cyanide by Modified Konig Reactions," Analyt. Chem. , 47 , 916-918 (1975). [4] DataChem Laboratories, NIOSH Sequence #6837-K (unpublished, March 21, 1990). [5] NIOSH/OSHA Occupational Health Guidelines for Chemical Hazards, U.S. Department of Health and Human Services. Publ. (NIOSH) 81-123 (1981), available as stock #PB 83-154609 form NTIS, Springfield, VA 22161. [6] DataChem Laboratories, User Check, NIOSH Sequence #6837-J (unpublished, March 19, 1990). METHOD WRITTEN BY: George Williamson, NIOSH/DPSE. NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94

### HYDROGEN CYANIDE: METHOD 6010, Issue 2, dated 15 August 1994 - Page 5 of 5

APPENDIX: STANDARDIZATION OF CALIBRATION STOCK SOLUTION Titrate an aliquot of the cyanide standard stock solution (Reagent 12) with standard silver nitrate (AgNO 3 

### ) solution. The end point is the first formation of a white precipitate, Ag[Ag(CN) 2 

### ]. Calculate the cyanide concentration with the following equation: M c 

### = 52.04 V a 

### (M a 

### /V c 

### ) Where M c



### = cyanide concentration (mg/mL) V a 

### = volume (mL) of standard silver nitrate solution M a 

### = concentration (moles/L) of standard silver nitrate solution V c 

### = volume (mL) of calibration stock solution titrated

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94