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

B

ARRICK 

# G OLDSTRIKE 

# M INES


# , I NC



# .

P ROJECT 

## 59-55-4 J ANUARY 

## 2010Goldstrike Hcn Monitoring Report_R2.Docx 

### ii 

# CONTENTS Page

1.0 INTRODUCTION .............................................................................................................. ........................................... 1 1.1 HCN Monitor and Meteorological Station Locations .......................................................................... ..................... 1 1.2 HCN Monitoring System Description ......................................................................................... ............................. 6 1.3 Data Recovery ............................................................................................................. .......................................... 7 1.4 Quality Control ........................................................................................................... ............................................. 7

2.0 METEOROLOGY AT THE METEOROLOGICAL STATION ................................................................................. .... 8

2.1 Winds ..................................................................................................................... ................................................ 8 2.2 Temperature, Relative Humidity, and Barometric Pressure ................................................................... ............ 11

3.0 HCN STATION ............................................................................................................... .......................................... 12

3.1 Winds ..................................................................................................................... .............................................. 12 3.2 Temperature, Relative Humidity, and Barometric Pressure ................................................................... ............ 12 3.3 HCN Concentration ......................................................................................................... ..................................... 13

4.0 DATA ANALYSI S ............................................................................................................. ........................................ 15



## Tables

Table 1: Sensor Locations .................................................................................................... ........................................... 6 Table 2: Data Recovery ....................................................................................................... ............................................ 7 Table 3: Frequency of Hourly Averaged Winds by Direction and Speed ........................................................... .............. 9 Table 4: Frequency of Hourly Averaged Winds by Direction and Stability ....................................................... ................ 9 Table 5: Temperature, Relative Humidity, and Barometric Pressure ............................................................. ................ 11 Table 6: Temperature, Relative Humidity, and Barometric Pressure ............................................................. ................ 12
Table 7: HCN Concentration ................................................................................................... ....................................... 13 Table 8: Measured HCN Concentration Analysis ................................................................................. .......................... 15



## Figures
Figure 1: HCN Monitoring Site ................................................................................................ ......................................... 2 Figure 2: Large Scale Area Map ............................................................................................... ....................................... 3 Figure 3: Roaster Mill ....................................................................................................... ................................................ 4 Figure 4: Wet Mill ........................................................................................................... .................................................. 5 Figure 5: Wind Frequency Distribution ........................................................................................ ................................... 10 Figure 6: Measured HCN Concentration Analysis ................................................................................ ......................... 16 Figure 7: Wind frequency for December 21, 2009 (Highest Concentration Day) ................................................... ........ 17 Figure 8: Wind frequency for December 15, 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 PlansGoldstrike Hcn Monitoring Report_R2.Docx 

### 1 

## SECTION 1 

# INTRODUCTION

This report summarizes the meteorological and hydrogen cyanide (HCN) data collected at the Barrick Goldstrike Mines, Inc. (Goldstr ike) meteorological station and HCN monitor through January 11, 2010. The HCN monitor station became operational on December 12, 2009, at 8:00 p.m. and the first 24-hour HCN sample was taken on December 15, 2009. The HCN monitoring equipment and sampling procedures followed Goldstrike’s Site-Specific Hydrogen Cyanide (HCN) Fence Line Monitoring
Plan (Site Specific Plan), approved by EPA on November 5, 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 Systems Volume IV - Meteorological Measurements (EPA-600/R94-038D),
March 1995.

Goldstrike operates a gold mining facility located approximately 23 miles northwest of Carlin, Nevada. The facility operates both open-pit and underground mines. Gold recovery operations include: crushing, milling, roasting, autoclaving, tank leaching, carbon adsorption, stripping and regeneration, 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 emissions, Goldstrike installed and continues to operate an HCN monitor downwind of the potential HCN sources, just inside the boundary of the Goldstrike operations area.



# 1.1 HCN Monitor and Meteorol ogical Station Locations

Aerial photos and shaded relief maps are provided in Figures 1 through 4. 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 Goldstrike mine and shows the location of the HCN monitor. The meteorological station is collocated with the HCN
monitor at 552,464 meters east, 4,539,909 meters nort h, UTM Zone 11N, NAD83, elevation 5,546 feet.

Figures 1, 3, and 4 highlight the potential source s of HCN emissions at Goldstrike. These sources include an active and an inactive tailings impoundm ent, tanks at the roaster mill area, and stacks and
tanks at the wet mill area. Closer views of the HC N sources at the mill areas are shown in Figures 3
and 4.Goldstrike Hcn Monitoring Report_R2.Docx 

### 6 

# 1.2 HCN Monitoring System Description

The HCN monitoring system consists of a data logger connected to a low-flow pump which is connected through sorbent tubes to an ambient air inlet. The sorbent tubes capture any HCN in the ambient air and are sent to the ALS Laboratory Group in Salt Lake City, Utah for analysis. The lab analysis is based on NIOSH Method 6010. The sa mpling schedule follows a 1-in-3 day calendar and will continue for a total sampling period of two months.

During a run day, all meteorological parameters ar e collected at more frequent intervals and timeaveraged into 15-minute values. Wind speed and wi nd direction are collected at the meteorological station. Ambient temperature, relative humidity , and barometric pressure as well as flow rate through the sorbent tubes are collected at the HCN monitor. Ambient temperature, relative humidity, and barometric pressure are also collected at the meteorological station and serve as a quality check for the HCN monitor data. The parameters collected are shown in Table 1.

The measurement height of the inlet is two meters. The height of the wind instruments is 10 meters. All other parameters are 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 are from the meteorological station.



## The hourly averaged data from the meteorological station are downloaded from the client website by Air Sciences Inc. (Air Sciences) and are then tran sferred into a database. The meteorological data from the HCN monitor are recorded by the onsite digital Data Acquisition System (DAS) equipped with cellular internet for data transfer. The para meters are digitally processed by the DAS into 15- minute averages. The 15-minute averages are tr ansmitted to Air Sciences for quality assurance checks, population into the database, and calculation of one-hour averages.Goldstrike Hcn Monitoring Report_R2.Docx 

### 7 

# 1.3 Data Recovery

Data recovery rates for all paramete rs are presented in Table 2.

The meteorological data recovery rate was 100 percen t for all parameters at the meteorological station and 97.1 percent at the HCN monitor. The lower da ta recovery rate at the HCN monitor was due to the site being shut down for maintenance and data logger program updates. The data recovery rates at the meteorological and HCN station are above the recommended rate of 90 percent for all meteorological parameters.

The data recovery rate for the flow rate to the sorb ent tubes was 97.1 percent. The data recovery rate for the HCN concentration from the sorbent tubes was 100 percent. Both parameters are above the recommended recovery rate of 75 percent.

Table 2: Data Recovery December 15, 2009 - January 11, 2010 (percent)



## Recorded Recommended

Parameter Observations Recovery Rate Recovery Rate Meteorological Station Wind speed 672 100.0 90
Wind direction 672 100.0 90 Ambient temperature 672 100.0 90 Relative humidity 672 100.0 90 Barometric pressure 672 100.0 90
HCN Station Ambient temperature 233 97.1 90 Relative humidity 233 97.1 90 Barometric pressure 233 97.1 90
Flow 233 97.1 75
HCN concentration 10 100.0 75



# 1.4 Quality Control

The 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.Goldstrike Hcn Monitoring Report_R2.Docx 

### 8 

## SECTION 2 

# METEOROLOGY AT THE METEOROLOGICAL STATION

The instantaneous wind speed, wind direction, te mperature, relative humidity, and barometric pressure data collected at the meteorological st ation during the monitored period were processed into hourly averages. 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

Hourly averaged winds measured at the site duri ng the sampling period are summarized in Table 3 as frequency distributions of winds by direction an d speed. The data period contains 28 days (672 hours) of complete wind information.

Figure 5 shows the distribution of hourly averag ed winds by direction and speed for the sampling period. The mean wind speed for the period was 1.4 m/s (3.1 mph). The winds were predominately from the northeast to the southeast with a secondary peak from the south-southwest to the west. The winds ranged from moderate to brisk this period. A breakdown of the wind speed profile for this period yields the following: There were 7.4 percen t calm wind speeds (<0.447 m/s), 64.0 percent of the winds were between 0.5 m/s (1.1 mph) and 1.5 m/s (3.4 mph), 26.7 percent of the winds were between 1.5 m/s and 5 m/s (11.2 mph), and 1.9 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.

The lower-speed daytime winds (classes A, B, and C) made up 31.4 percent of the total winds and were predominately from the west-southwest to the west with a secondary peak from the southeast. The lower-speed nighttime winds (classes E and F) constituted 52.2 percent of the total winds and were predominately from the northeast to the east -northeast. The higher-speed winds (class D) comprised 16.4 percent of the total winds and were evenly distributed.Goldstrike Hcn Monitoring Report_R2.Docx 

### 9 Direction A B C D E F All

N 0.2 0.5 0.3 2.3 0.2 2.8 6.2

NNE 0.3 0.5 0.5 0.0 1.1 1.2 3.5

NE 0.3 0.5 0.8 0.3 2.2 5.1 9.1

ENE 0.2 0.6 0.6 1.1 0.9 6.5 9.9

E 0.2 0.9 0.8 0.9 0.8 3.7 7.3

ESE 0.2 1.1 1.2 0.9 0.8 3.4 7.6

SE 1.2 0.9 1.1 2.3 1.9 1.9 9.3

SSE 0.6 0.6 0.3 1.1 0.6 1.9 5.1

S 0.5 0.8 0.5 0.6 0.5 1.1 3.9

SSW 0.5 0.3 1.7 1.1 0.6 2.2 6.3

SW 0.8 0.6 1.1 1.2 1.1 2.8 7.6

WSW 0.8 1.2 1.5 1.1 0.5 2.8 7.9

W 0.5 1.9 2.2 2.2 0.9 1.9 9.4

WNW 0.3 0.8 0.3 0.5 0.2 0.8 2.8

NW 0.6 0.2 0.0 0.2 0.2 1.2 2.3

NNW 0.0 0.2 0.3 0.6 0.5 0.5 2.0

All 6.9 11.4 13.1 16.4 12.7 39.5 100.0 Stability Class 

### Table 3: Frequency of Hourly Averaged Winds by Direction and Speed December 15, 2009 - January 11, 2010 (percent of occurrence)



## Calm (< 0.447 m/s) = 7.4% Mean wind speed = 1.4 m/s Data presented as direction from which wind is blowing.

Table 4: Frequency of Hourly Averag ed Winds by Direction and Stability December 15, 2009 - January 11, 2010 (percent of occurrence) 

### Mean

Direction 0.5 <1.5 1.5 <3 3 <5 5 <7 7 <10 >=10 All Speed

N 2.9 0.2 1.1 0.2 0.8 0.5 5.6 3.5

NNE 2.8 0.3 0.0 0.0 0.0 0.0 3.1 0.8

NE 7.1 0.9 0.0 0.0 0.0 0.0 8.0 0.9

ENE 8.0 0.8 0.2 0.0 0.0 0.0 9.0 1.0

E 4.2 1.9 0.8 0.0 0.0 0.0 6.8 1.4

ESE 2.9 2.9 0.9 0.0 0.0 0.0 6.8 1.8

SE 3.5 3.4 1.9 0.0 0.0 0.0 8.8 1.9

SSE 2.3 2.5 0.2 0.0 0.0 0.0 4.9 1.6

S 3.1 0.6 0.2 0.0 0.0 0.0 3.9 1.1

SSW 4.6 1.4 0.2 0.0 0.0 0.0 6.2 1.2

SW 5.2 1.2 0.0 0.0 0.0 0.0 6.5 1.0

WSW 5.6 1.9 0.0 0.0 0.0 0.0 7.4 1.1

W 6.6 2.0 0.2 0.0 0.0 0.0 8.8 1.2

WNW 2.2 0.3 0.3 0.0 0.0 0.0 2.8 1.4

NW 2.0 0.3 0.0 0.0 0.0 0.0 2.3 1.0

NNW 0.9 0.3 0.2 0.0 0.2 0.3 1.9 3.4

All 64.0 20.8 5.9 0.2 0.9 0.8 92.6 1.4 Speed Class Intervals (m/s)Goldstrike Hcn Monitoring Report_R2.Docx 

### 10 Figure 5: Wind Frequency Distribution



### 2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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: 12/15/09 - 1/11/10 Calm = 51 Missing = 0 Number of non-calm/missing = 621Goldstrike Hcn Monitoring Report_R2.Docx 

### 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 -1.9 ° C (28.6 ° F). The maximum hourly averaged 2-meter temperature was 6.8 ° C (44.2 ° F) and occurred on the afternoon of January 11, 2010. The minimum hourly averaged 2-meter temperature was -12.6 ° C (9.3 ° F) and occurred on the morning of December
23, 2009.

The relative humidity mean and extremes for the sampling period are presented in Table 5. The average relative humidity for the period was 78 percent. The minimum hourly average was 44 percent and the maximum was 100 percent.

Barometric pressure data collected during the sa mpling period are summarized in Table 5. The average barometric pressure for the period was 24.6 inHg (624.8 mmHg). The maximum hourly averaged barometric pressure for the period wa s 24.8 inHg (629.9 mmHg) and occurred for two consecutive hours in the morning of January 9, 20 10, for four consecutive hours in the evening of January 10, 2010, and again for two consecutive hours in the morning of January 11, 2010. The minimum hourly averaged barometr ic pressure for the period was 24.2 inHg (614.7 mmHg) and occurred for one hour in the evening of December 21, 2009, and again for ei ghteen consecutive hours on December 21 through December 22 , 2009, beginning in the evening.

Table 5: Temperature, Relative Humidity, and Barometric Pressure December 15, 2009 - January 11, 2010



## Parameter Temperature ( ° C) 

## Relative Humidity (%) Barometric
Pressure (inch Hg) Avg. -1.9 78 24.6
Max. 6.8 100 24.8
Min. -12.6 44 24.2Goldstrike Hcn Monitoring Report_R2.Docx 

### 12 

## SECTION 3 

# HCN STATION

The instantaneous temperature, relative humidity, and barometric pressure data collected at the HCN monitor on each run day duri ng the monitored period were processed into hourly averages. 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.



# 3.1 Winds

There was no wind data collected at the HCN monitor, see Section 2.1 above for wind data.


# 3.2 Temperature, Relative Humi dity, and Barometric Pressure

The temperature mean and extremes for the sampling period are presented in Table 6. The average 2-meter temperature for the period was -2.27 ° C (27.9 ° F). The maximum hourly averaged 2-meter temperature was 5.94 ° C (42.7 ° F) and occurred on the afternoon of January 11, 2010. The minimum hourly averaged 2-meter temperature was -12.96 ° C (8.7 ° F) and occurred on the morning of December
24, 2009.

The relative humidity mean and extremes for the sampling period are presented in Table 6. The average relative humidity for the period was 74 percent. The minimum hourly average was 48 percent and the maximum was 99 percent.

Barometric pressure data collected during the sa mpling period are summarized in Table 6. The average barometric pressure for the period was 625 mmHg. The maximum hourly averaged barometric pressure for the period was 629 mmHg and occurred for one hour in the morning of December 24, 2009, and again for three consecutive hours in the morning of January 11, 2010. The minimum hourly averaged barome tric pressure for the period was 615 mmHg and occurred for one hour in the evening of December 21, 2009.

Table 6: Temperature, Relative Humidity, and Barometric Pressure December 15, 2009 - January 11, 2010



## Parameter Temperature ( ° C) 

## Relative Humidity (%) Barometric
Pressure (mmHg) Avg. -2.27 74 625
Max. 5.94 99 629
Min. -12.96 48 615Goldstrike Hcn Monitoring Report_R2.Docx 

### 13 

# 3.3 HCN Concentration

The HCN concentration data collected during the sa mpling period are summarized in Table 7. The average HCN concentration corrected to standard conditions 1 

## was 3.41 μg/m 3 

## . The minimum HCN concentration for the period was 0.50 μg/m 3 

## and occurred on December 27, 2009. The maximum HCN concentration for the period was 7.94 μg/m 3 

## and occurred on December 21, 2009. The HCN concentration in the field blank was below the detection level of 0.21 μg/sample.

Table 7: HCN Concentration December 15, 2009 - January 11, 2010 (μg/m 3 

### )



## HCN Concentration

Run Day* Actual
Conditions Standard
Conditions 12/15/2009 1.70 1.90 12/18/2009 2.06 2.29 12/21/2009 7.05 7.94 12/24/2009 2.61 2.80 12/27/2009 0.46 0.50 12/30/2009 4.26 4.68 01/02/2010 3.59 3.98 01/05/2010 5.89 6.52 01/08/2010 1.47 1.61 01/11/2010 1.70 1.90 Average 3.08 3.41

*Start time = 0:00:02; stop time = 0:00:00.



## The EPA lifetime exposure reference concentration is listed as 3E-3 mg/m 3



## . 2 

## Rounding the measured average HCN concentration from Table 7 of 3.41 μg/m 3 

## to one significant figure, consistent with the EPA reference concentration, yields 3E-3 mg/m 3 

## . Thus, the rounded HCN concentration is equal to
the reference concentration.

It is important to note that the HCN monitor is lo cated approximately 0.2 miles inside the operations area boundary and less than one mile from the ac tive tailings impoundment and roaster mill. See Figure 1. The monitor location was chosen to prov ide a conservatively high estimate of the ambient HCN concentrations to which the public could be ex posed. Goldstrike plans to explore with the EPA the possibility of moving the HCN monitor further from the HCN sources in order to collect ambient HCN concentration data that better represents po tential long-term human exposure levels. The measurements from this new location would provide data more directly comparable to the EPA
reference concentration.

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.Goldstrike Hcn Monitoring Report_R2.Docx 

### 14 

## The maximum measured HCN concentration of 7.94 μg/m 3 

## is three orders of magnitude smaller than the National Institute for Occupational Safety and Health (NIOSH) recommended short-term exposure limit of 4,700 ppb (5,190 μg/m 3 

## ). 3 

## In addition, the EPA refe rence concentration of 3 μg/m 3 

## was developed with a total uncertainty factor of 1,000, where the Lowest Observed Adverse Effect Level (LOAEL) was 7,070 μg/m 3



## . 2

3 Occupational Safety and Health Guideline for Hydrogen Cyanide. http://www.osha.gov/SLTC/healthguideli nes/hydrogencyanide/recognition.htmlGoldstrike Hcn Monitoring Report_R2.Docx 

### 15 

## SECTION 4 

# DATA ANALYSIS

Based on the data collected from the first four week s of monitoring, an analys is of wind direction and measured HCN concentration was conducted. As shown in Figures 1 and 2, winds from 82 ° through

189 ° (approximately east-northeast through south-southwest) blew from the potential HCN sources at the Goldstrike mine towards to the HCN monitor. The percent of winds blowing within this range of directions on each sample day is shown in Table 8 and Figure 6.

As shown by Table 8 and Figure 6, there does not appear to be a correlation between wind direction
and measured HCN concentration. On both the second-highest and second-lowest HCN concentration days, the winds blew from the potential HCN sources towards the monitor 8 percent of the time. On the highest concentration day, the winds blew towards the monitor 38 percent of the time; however, on the day the winds blew from the HCN sources towards the HCN monitor 92 percent of the time, the HCN concentration was third-lowest.

Table 8 also shows that there does not appear to be a correlation between wind speed and measured HCN concentration. The second-highest and the lo west HCN concentration days had the lowest and second-lowest average wind speed, respectively.

Table 8: Measured HCN Concentration Analysis December 15, 2009 - January 11, 2010



## HCN
Concentration Winds Blowing from HCN
Sources towards Monitor Average Wind Speed Run Day (μg/m 3 

## ) No. of Hours Percent (m/s) 12/15/09 1.90 22 92 2.8 12/18/09 2.29 7 29 0.9 12/21/09 7.94 9 38 1.3 12/24/09 2.80 2 8 0.9 12/27/09 0.50 5 21 0.8 12/30/09 4.68 6 25 1.8 01/02/10 3.98 10 42 1.0 01/05/10 6.52 2 8 0.7 01/08/10 1.61 2 8 1.2 01/11/10 1.90 17 71 2.9 Average 3.41Goldstrike Hcn Monitoring Report_R2.Docx 

### 16 Figure 6: Measured HCN Concentration Analysis



## Figures 7 and 8 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 HCN concentration was measured on December 21, 2009, when the winds had a slight predominance from the south-southeast. The day with the highest pe rcent of winds blowing towards the monitor was on December 15, 2009, when all but two hours of wi nd blew from the potential HCN sources towards
the monitor. 0 10 20 30 40 50 60 70 80 90 100

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0PercentofWinds(%)HCNConcentration(μg/m3)



### Run Day HCN Concentration Percent of Winds Towards MonitorGoldstrike Hcn Monitoring Report_R2.Docx 

### 17 2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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: 12/21/2009 Calm = 0 Missing = 0 Number of non-calm/missing = 24

5%

10%

15%

20%

25%

30%

35%

40%

45%

50% 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: 12/15/2009 Calm = 0 Missing = 0 Number of non-calm/missing = 24 

### Figure 7: Wind frequency for December 21, 2009 (Highest Concentration Day)

Figure 8: Wind frequency for December 15, 2009 (Day with Highest Percent of Winds Blowing Towards Monitor)

# 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 Min12/15/2009 3.6 3.0 2.4 3.0 3.1 2.1 3.7 1.8 3.0 1.0 1.5 2.3 3.1 3.3 3.5 3.3 2.9 2.7 1.9 2.6 3.0 3.1 2.8 3.1 2.7 3.7 1.012/16/2009 3.6 2.9 2.3 1.6 2.4 3.3 1.9 2.7 2.5 1.9 0.9 0.8 0.9 1.4 0.7 0.5 0.8 1.4 1.0 0.5 1.0 1.1 0.5 0.5 1.5 3.6 0.512/17/2009 0.8 1.7 0.5 1.5 0.6 0.6 1.2 0.4 0.5 0.7 1.1 1.1 1.5 1.3 0.6 1.7 1.6 1.0 0.8 0.6 1.0 0.5 1.1 0.6 1.0 1.7 0.412/18/2009 0.5 0.4 0.9 0.9 0.7 0.4 0.7 0.4 0.8 1.5 1.0 1.0 1.0 1.4 1.8 1.9 0.7 0.9 0.8 0.7 0.8 1.5 0.6 0.6 0.9 1.9 0.412/19/2009 0.6 0.6 1.5 1.1 1.0 0.9 0.5 0.8 0.8 0.5 1.9 1.1 1.2 1.5 1.7 1.4 0.6 0.7 0.7 0.6 0.8 0.5 0.4 0.6 0.9 1.9 0.412/20/2009 0.5 0.8 0.4 0.7 0.5 0.6 0.7 0.9 0.6 0.9 0.7 1.3 1.1 0.8 1.3 1.1 1.4 1.9 0.8 0.9 1.0 0.5 0.6 0.9 0.9 1.9 0.412/21/2009 0.7 1.1 1.0 0.8 1.2 1.6 0.5 1.5 0.5 0.6 0.5 1.7 1.5 0.8 1.0 0.7 1.5 3.5 2.9 1.6 2.9 1.4 1.8 2.4 1.4 3.5 0.512/22/2009 1.6 1.0 1.5 0.8 0.9 5.2 8.0 9.5 10.6 10.4 10.4 10.2 10.2 9.7 8.8 8.5 7.7 4.8 4.9 4.5 3.1 4.2 4.8 3.4 6.0 10.6 0.812/23/2009 1.8 3.7 1.5 0.7 0.9 0.7 1.2 0.9 0.6 0.2 1.7 1.7 2.1 2.1 1.8 1.4 0.7 0.7 0.4 0.7 1.0 0.7 1.4 0.9 1.2 3.7 0.212/24/2009 0.8 0.7 0.4 0.6 0.5 0.7 0.6 0.8 0.5 0.5 1.6 1.8 1.3 1.1 1.2 1.0 0.7 1.1 0.7 0.7 0.7 1.6 1.0 0.7 0.9 1.8 0.412/25/2009 0.7 0.5 0.3 0.2 0.4 0.4 1.0 0.5 0.5 0.6 1.3 1.9 2.2 1.1 1.4 1.6 1.0 1.3 0.7 0.6 1.2 0.9 0.9 0.8 0.9 2.2 0.212/26/2009 0.6 0.6 0.6 3.2 1.5 0.4 0.5 1.5 1.5 2.8 3.2 2.5 2.5 3.4 2.5 3.1 3.2 2.3 2.9 1.8 1.1 1.1 1.4 0.8 1.9 3.4 0.412/27/2009 0.7 1.2 1.1 0.6 0.7 0.8 0.7 0.8 0.9 0.7 1.2 0.8 1.8 0.8 1.3 1.0 0.7 0.6 1.1 0.7 0.5 0.3 0.3 1.4 0.9 1.8 0.312/28/2009 0.5 0.8 0.5 0.6 0.5 0.6 0.9 1.3 1.6 1.1 1.0 1.1 1.7 1.8 2.5 1.0 0.5 1.0 0.5 1.2 1.0 1.0 0.8 0.8 1.0 2.5 0.512/29/2009 0.7 0.4 0.5 0.6 0.1 0.0 0.3 0.3 1.0 1.3 0.8 2.1 1.3 0.9 1.4 0.6 1.5 2.1 1.6 2.1 2.0 2.7 2.4 2.7 1.2 2.7 0.012/30/2009 2.4 2.2 1.2 0.6 0.9 0.7 0.5 0.7 1.2 1.1 1.6 2.0 2.9 4.4 3.2 3.9 2.7 1.7 1.2 1.2 0.8 1.2 1.6 1.1 1.7 4.4 0.512/31/2009 1.8 1.8 0.8 1.6 2.0 3.3 3.6 1.2 1.5 1.2 1.7 1.1 1.4 1.4 2.2 0.5 2.2 2.0 3.0 2.2 2.0 1.3 0.7 1.1 1.7 3.6 0.501/01/2010 0.7 0.6 0.7 0.6 0.9 1.0 1.5 2.0 1.0 1.4 2.5 3.0 2.3 1.9 1.9 2.3 0.8 2.1 1.5 0.9 1.4 2.1 2.1 1.1 1.5 3.0 0.601/02/2010 0.8 1.0 0.8 1.0 1.2 0.9 1.5 2.0 1.4 0.6 0.9 1.6 0.8 1.4 1.0 0.7 1.2 1.2 1.0 0.6 0.6 0.4 0.5 0.8 1.0 2.0 0.401/03/2010 1.3 1.0 1.0 0.6 0.4 1.1 1.2 0.9 0.5 0.5 0.5 1.2 1.0 0.6 1.0 0.8 0.7 0.7 0.6 0.7 0.6 0.6 0.7 0.6 0.8 1.3 0.401/04/2010 0.8 0.8 0.6 0.6 0.7 0.3 0.4 0.6 0.3 0.4 1.1 1.5 1.3 0.7 0.9 0.9 0.5 0.4 0.4 0.4 0.4 0.4 0.5 0.3 0.6 1.5 0.301/05/2010 0.7 0.6 0.4 0.4 0.5 0.6 1.1 0.8 0.8 0.6 0.6 0.8 1.0 0.9 0.8 0.6 0.4 1.1 0.8 1.2 1.3 0.4 0.5 0.7 0.7 1.3 0.401/06/2010 0.7 0.5 0.6 1.2 0.5 0.5 0.5 1.5 1.3 1.0 1.4 1.1 0.5 0.7 0.6 1.0 0.6 0.4 1.0 1.2 1.3 0.7 0.9 0.4 0.8 1.5 0.401/07/2010 0.4 0.4 0.3 0.3 0.7 0.4 0.5 1.2 0.6 1.3 2.5 2.1 0.9 0.6 2.0 1.2 2.1 2.2 3.2 1.0 0.6 0.6 1.3 1.1 1.1 3.2 0.301/08/2010 0.5 1.3 0.7 1.2 0.7 0.7 1.0 0.6 0.5 0.8 1.0 3.8 1.9 2.2 1.8 1.4 0.5 1.8 0.7 1.0 1.2 0.8 1.3 0.8 1.2 3.8 0.501/09/2010 1.1 0.7 1.0 0.7 1.7 1.0 0.9 0.7 0.8 1.1 1.6 1.3 1.5 0.7 0.5 1.6 1.2 2.2 1.1 0.9 1.2 0.4 0.6 0.3 1.0 2.2 0.301/10/2010 0.7 0.3 0.5 0.9 1.1 1.6 1.7 0.9 0.5 1.4 1.7 1.1 2.1 2.0 1.2 1.3 0.5 0.6 1.3 0.8 1.1 0.4 0.7 0.5 1.0 2.1 0.301/11/2010 0.3 0.4 0.6 0.4 0.6 1.0 1.0 0.9 2.1 1.3 2.8 2.6 3.7 2.7 4.4 4.6 5.0 5.4 5.6 6.1 6.3 5.4 5.7 5.4 3.1 6.3 0.3Avg 1.1 1.1 0.9 1.0 1.0 1.1 1.4 1.4 1.4 1.3 1.7 2.0 2.0 1.8 1.9 1.8 1.6 1.7 1.5 1.4 1.4 1.3 1.4 1.2 1.4‐‐ ‐‐Max 3.6 3.7 2.4 3.2 3.1 5.2 8.0 9.5 10.6 10.4 10.4 10.2 10.2 9.7 8.8 8.5 7.7 5.4 5.6 6.1 6.3 5.4 5.7 5.4‐‐10.6‐‐Min 0.3 0.3 0.3 0.2 0.1 0.0 0.3 0.3 0.3 0.2 0.5 0.8 0.5 0.6 0.5 0.5 0.4 0.4 0.4 0.4 0.4 0.3 0.3 0.3‐‐ ‐‐0.0SAROADforBarrick,GoldstrikeChannel:WS_ms_10mMonth:12/15/09‐01/11/10HourofdayDay 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 Min12/15/2009 138 138 136 115 128 125 127 111 158 43 181 151 136 135 123 136 119 137 189 163 169 124 102 88 132 189 4312/16/2009 130 114 115 167 145 109 148 62 129 149 126 182 224 144 291 321 257 59 92 73 61 62 73 87 138 321 5912/17/2009 86 55 262 55 71 103 39 122 197 225 222 244 261 273 203 121 54 51 103 177 52 136 146 39 137 273 3912/18/2009 104 269 266 39 77 139 104 69 230 265 266 250 251 254 252 261 64 98 56 148 88 59 96 249 165 269 3912/19/2009 99 146 11 60 79 123 225 152 198 278 238 202 279 204 257 314 69 353 185 14 63 54 150 160 163 353 1112/20/2009 55 31 36 360 359 167 179 271 167 272 237 225 269 282 287 228 140 150 61 191 213 304 12 110 192 360 1212/21/2009 68 75 72 156 141 164 249 166 282 225 281 212 230 287 266 348 79 116 162 98 92 360 44 120 179 360 4412/22/2009 212 206 243 276 312 350 341 351 353 351 349 347 346 352 352 352 353 9 0 352 352 355 355 355 301 355 012/23/2009 340 347 22 36 353 53 56 53 73 142 255 246 256 244 259 266 14 37 103 64 56 78 49 53 144 353 1412/24/2009 47 211 350 146 59 84 272 53 245 235 210 253 261 260 242 243 11 51 281 41 71 46 43 257 166 350 1112/25/2009 207 23 229 251 97 42 57 228 38 224 207 208 264 270 264 264 11 64 52 57 44 122 32 93 140 270 1112/26/2009 73 23 51 67 226 53 2 122 201 160 130 107 127 139 147 128 99 92 99 93 271 80 111 122 113 271 212/27/2009 267 234 48 303 245 26 59 10 180 212 215 230 254 102 263 305 268 281 116 30 73 96 252 41 171 305 1012/28/2009 86 232 264 302 10 214 234 246 321 292 261 236 226 143 118 313 226 237 278 194 250 331 238 80 222 331 1012/29/2009 324 118 319 26 53 110 240 277 276 264 269 228 266 246 172 163 135 164 113 123 157 136 153 137 186 324 2612/30/2009 185 176 253 340 117 316 261 206 197 234 262 264 269 284 289 280 290 30 9 77 99 76 90 125 197 340 912/31/2009 92 123 117 130 130 119 122 146 140 165 203 205 210 236 125 129 83 118 100 91 67 164 0 100 130 236 001/01/2010 3 93 350 199 111 130 114 135 224 124 133 99 107 119 126 152 191 142 157 141 129 128 138 141 141 350 301/02/2010 49 59 223 96 60 61 80 67 83 50 151 218 197 202 151 150 126 131 91 66 48 61 88 111 109 223 4801/03/2010 70 75 83 87 111 68 69 83 221 181 186 213 222 258 204 247 18 175 81 126 36 20 199 113 131 258 1801/04/2010 94 248 257 20 184 219 214 215 217 215 208 214 262 250 243 239 10 15 74 227 81 46 62 236 169 262 1001/05/2010 59 49 278 69 210 43 37 254 68 231 249 228 224 220 262 304 42 182 33 77 111 26 57 85 142 304 2601/06/2010 179 76 82 155 57 135 174 118 151 203 210 270 270 284 245 241 236 20 138 72 110 14 108 5 148 284 501/07/2010 35 5 57 212 345 270 64 73 240 266 317 335 298 272 292 272 120 124 95 32 41 48 69 322 175 345 501/08/2010 48 58 28 45 46 45 349 291 237 339 225 197 265 267 261 277 187 225 328 301 129 251 292 36 197 349 2801/09/2010 315 59 212 238 49 237 56 176 19 53 211 212 264 270 262 142 131 81 185 147 178 357 235 64 173 357 1901/10/2010 66 345 197 258 9 62 234 358 75 204 245 182 200 253 286 268 0 53 51 196 71 142 222 315 179 358 001/11/2010 64 113 184 242 75 29 117 68 140 304 128 142 143 182 144 137 139 138 124 124 126 118 119 124 134 304 29Avg 125 132 169 159 138 128 151 160 181 211 221 218 235 230 228 236 124 119 120 125 116 136 126 135 163‐‐ ‐‐Max 340 347 350 360 359 350 349 358 353 351 349 347 346 352 352 352 353 353 328 352 352 360 355 355‐‐360‐‐Min 3 5 11 20 9 26 2 10 19 43 126 99 107 102 118 121 0 9 0 14 36 14 0 5‐‐ ‐‐0SAROADforBarrick,GoldstrikeChannel:WD_10mMonth:12/15/09‐01/11/10HourofdayDay 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 Min12/15/2009‐0.5‐0.8‐1.1‐1.1‐0.3‐0.1 0.5 0.3 0.8 0.6 1.6 2.5 2.8 3.1 3.4 3.3 3.7 3.9 3.2 2.9 3.4 2.5 2.9 4.1 1.7 4.1‐1.112/16/2009 3.6 2.9 3.9 3.2 3.6 3.6 3.0 2.8 2.8 3.3 4.1 5.4 5.7 5.4 4.4 3.8 2.6 1.6 1.4 0.5 0.7 0.8 0.9 1.0 3.0 5.7 0.512/17/2009 0.6 0.2‐0.4‐1.1‐1.6‐0.6‐0.9 0.3 0.7 2.0 2.8 3.5 3.6 4.3 4.7 3.5 2.3 1.8 1.5 1.1 0.6 1.1 0.9 0.6 1.3 4.7‐1.612/18/2009 1.0 0.5 0.1‐0.3‐0.1‐0.3 0.1‐0.3 0.0‐0.4 0.7 2.6 3.8 4.2 4.3 3.3 1.6 0.7‐0.7‐0.2‐0.9‐1.6‐0.7‐1.8 0.7 4.3‐1.812/19/2009‐1.5‐1.3‐3.0‐2.7‐2.1‐2.2‐2.2‐3.0‐1.5‐0.4 0.3 0.6 1.5 2.8 1.9 0.1 0.2 0.3‐0.2‐0.1‐0.8‐1.1‐1.6‐1.8‐0.7 2.8‐3.012/20/2009‐2.6‐3.0‐2.9‐3.8‐3.9‐3.5‐3.4‐3.8‐3.0‐1.5‐0.9‐0.5‐1.1‐0.5‐0.6‐0.5‐0.3 1.5 0.1‐1.2‐1.4‐1.7‐2.5‐0.3‐1.7 1.5‐3.912/21/2009‐0.7‐0.8‐0.6 0.0 0.9 0.6 0.0 0.0‐0.3 0.9 1.8 3.2 3.5 2.9 2.3 1.4 1.3 3.6 2.5 1.1 1.4‐0.2‐0.7 0.1 1.0 3.6‐0.812/22/2009‐0.8‐1.1‐1.8‐1.9‐2.1‐3.7‐4.4‐5.3‐5.7‐5.6‐5.3‐5.3‐5.4‐5.9‐5.7‐5.9‐6.7‐7.5‐7.8‐7.5‐7.2‐8.5‐9.0‐9.6‐5.4‐0.8‐9.612/23/2009‐11.0‐10.6‐11.1‐11.1‐12.6‐12.4‐11.6‐12.0‐11.4‐9.4‐8.0‐7.4‐6.8‐6.1‐6.3‐6.6‐8.1‐8.6‐8.7‐9.4‐10.2‐10.4‐11.2‐10.2‐9.6‐6.1‐12.612/24/2009‐11.1‐10.6‐10.9‐11.3‐12.0‐11.3‐11.2‐11.9‐10.7‐8.0‐6.8‐6.7‐6.1‐5.3‐4.6‐5.3‐8.4‐9.0‐8.3‐8.9‐9.6‐9.9‐10.0‐9.5‐9.1‐4.6‐12.012/25/2009‐9.2‐9.1‐9.6‐10.4‐10.5‐11.1‐10.6‐10.6‐9.3‐7.1‐5.5‐5.1‐5.9‐5.0‐4.6‐5.7‐8.5‐9.3‐9.0‐8.1‐8.5‐7.7‐8.7‐8.5‐8.2‐4.6‐11.112/26/2009‐8.8‐9.4‐9.1‐6.8‐8.0‐8.9‐9.1‐7.5‐6.4‐4.4‐3.0‐2.0‐0.7‐0.4‐0.5‐1.5‐3.5‐3.8‐3.5‐3.9‐4.7‐4.7‐5.0‐5.5‐5.0‐0.4‐9.412/27/2009‐6.0‐7.2‐8.3‐8.3‐8.4‐9.1‐8.3‐7.5‐6.3‐5.1‐4.0‐3.6‐3.4‐2.6‐2.8‐3.7‐3.5‐5.6‐5.3‐5.4‐5.6‐5.6‐6.9‐7.5‐5.8‐2.6‐9.112/28/2009‐6.9‐5.3‐6.0‐6.5‐6.8‐7.0‐6.6‐6.4‐6.7‐5.6‐5.0‐2.7‐0.8 1.3 1.3‐1.7‐2.7‐1.6‐2.8‐2.7‐4.0‐5.3‐5.6‐6.0‐4.3 1.3‐7.012/29/2009‐6.2‐6.1‐6.2‐6.8‐6.5‐6.1‐6.1‐6.2‐6.4‐6.3‐5.5‐4.8‐5.5‐4.9‐4.6‐4.7‐4.6‐4.6‐4.5‐4.1‐4.2‐4.3‐4.3‐4.3‐5.3‐4.1‐6.812/30/2009‐3.7‐3.6‐4.0‐4.4‐4.2‐4.2‐4.0‐3.5‐3.0‐2.8‐2.4‐1.8‐1.5‐1.1‐1.1‐1.0‐2.6‐3.4‐5.1‐6.2‐6.5‐7.3‐7.2‐6.9‐3.8‐1.0‐7.312/31/2009‐7.2‐7.3‐8.2‐7.3‐6.9‐6.8‐6.6‐8.4‐5.7‐3.8‐3.6‐3.0‐2.4‐3.3‐3.7‐2.7‐2.3‐2.4‐1.7‐0.8‐0.1‐1.3‐2.4‐2.3‐4.2‐0.1‐8.401/01/2010‐2.8‐2.5‐2.2‐1.7‐0.9‐0.3 0.2 0.8 0.0 0.5‐0.1 0.9 2.4 3.1 3.0 3.2 2.6 3.5 3.2 2.6 2.2 2.0 1.4 0.9 0.9 3.5‐2.801/02/2010 0.6 0.6 0.3‐0.8‐0.2‐1.0‐2.2‐2.1‐0.5‐0.1 2.5 2.4 3.0 3.2 2.3 1.7 0.3‐1.0‐1.1‐1.0‐0.3 0.1‐0.4‐1.3 0.2 3.2‐2.201/03/2010‐2.8‐2.9‐3.5‐3.4‐3.2‐3.7‐3.4‐3.3‐3.0‐1.3 0.6 1.2 1.8 1.8 2.8 1.6‐1.4‐1.4‐1.0‐1.7‐1.8‐2.2‐2.1‐3.1‐1.5 2.8‐3.701/04/2010‐1.6‐1.7‐3.3‐4.9‐5.3‐5.3‐5.9‐5.5‐4.4‐2.7‐1.2 0.0‐0.7 0.3 0.8 0.4‐1.1‐2.0‐1.6‐1.8‐2.9‐3.0‐3.5‐3.2‐2.5 0.8‐5.901/05/2010‐3.0‐2.0‐1.3‐1.2‐2.2‐2.7‐2.6‐3.0‐2.5‐0.8 0.5 1.7 2.2 2.7 2.4 1.9 0.7 0.5 0.2‐0.5‐0.4 0.1‐0.4‐0.5‐0.4 2.7‐3.001/06/2010 0.0 0.5 0.8 0.6 0.2 1.2 1.0 1.3 1.7 2.4 3.0 2.8 2.9 2.7 3.0 2.8 2.4 1.3 0.4‐0.2 0.3‐0.3 0.6 0.2 1.3 3.0‐0.301/07/2010 0.2 0.5 0.8 0.5 0.3 0.1‐0.3 0.1 0.5 1.3 1.6 1.8 2.0 2.2 1.8 0.8 0.6‐0.1‐1.0‐3.1‐3.1‐3.9‐3.6‐5.1‐0.2 2.2‐5.101/08/2010‐5.1‐4.9‐5.5‐5.3‐5.6‐5.8‐5.4‐5.9‐5.1‐2.9‐0.8 0.5 0.0‐1.3‐1.6‐2.1‐2.2‐2.7‐2.9‐2.8‐2.3‐2.6‐2.5‐2.8‐3.2 0.5‐5.901/09/2010‐2.0‐1.8‐1.2‐1.2‐0.9‐0.4‐0.5‐1.0‐1.3 1.6 3.5 4.2 3.9 4.2 4.0 4.8 4.0 4.9 4.0 3.2 2.7 2.1 2.2 1.9 1.7 4.9‐2.001/10/2010 1.8 2.6 2.0 0.8‐0.3 0.3 0.3‐0.7 0.9 3.1 3.8 5.3 6.1 5.8 5.7 5.2 3.9 2.6 1.4 1.9 1.6 2.1 1.6 1.1 2.5 6.1‐0.701/11/2010 0.6 0.4‐0.1‐0.6 0.2‐0.8‐0.7‐0.3 1.3 1.8 4.4 6.2 6.8 5.4 6.3 6.4 5.6 5.3 5.2 5.2 5.3 5.1 4.7 5.1 3.3 6.8‐0.8Avg‐3.0‐3.0‐3.3‐3.5‐3.6‐3.6‐3.6‐3.7‐3.0‐1.8‐0.7 0.1 0.4 0.7 0.7 0.1‐0.9‐1.1‐1.5‐1.8‐2.0‐2.3‐2.6‐2.7‐1.9‐‐ ‐‐Max 3.6 2.9 3.9 3.2 3.6 3.6 3.0 2.8 2.8 3.3 4.4 6.2 6.8 5.8 6.3 6.4 5.6 5.3 5.2 5.2 5.3 5.1 4.7 5.1‐‐6.8‐‐Min‐11.1‐10.6‐11.1‐11.3‐12.6‐12.4‐11.6‐12.0‐11.4‐9.4‐8.0‐7.4‐6.8‐6.1‐6.3‐6.6‐8.5‐9.3‐9.0‐9.4‐10.2‐10.4‐11.2‐10.2‐‐ ‐‐ ‐12.6SAROADforBarrick,GoldstrikeChannel:Temp_CMonth:12/15/09‐01/11/10HourofdayDay 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 Min12/15/2009 70 69 70 66 62 62 57 60 58 64 60 55 54 57 63 63 59 66 66 66 77 86 89 79 66 89 5412/16/2009 69 77 72 71 71 75 80 88 86 79 76 72 72 75 76 77 84 88 84 80 79 82 85 83 78 88 6912/17/2009 84 83 86 87 89 88 89 86 83 81 79 73 72 68 67 73 76 81 81 81 82 83 85 85 81 89 6712/18/2009 82 86 88 90 88 90 89 86 86 88 85 75 69 67 67 71 78 84 87 89 89 89 86 87 83 90 6712/19/2009 91 90 92 94 92 91 89 91 91 91 90 86 80 78 79 83 84 88 85 83 83 85 88 91 87 94 7812/20/2009 92 91 89 90 90 88 88 89 88 83 83 85 83 81 84 85 87 75 80 82 86 86 88 74 85 92 7412/21/2009 72 69 70 68 65 65 70 68 72 72 68 65 63 63 66 68 72 52 58 68 66 84 92 98 70 98 5212/22/2009 98 99 100 100 100 97 88 85 79 79 71 71 71 71 70 73 76 78 81 85 81 82 84 86 84 100 7012/23/2009 88 90 89 90 90 90 91 92 88 84 82 80 77 75 74 71 76 82 81 84 82 86 86 85 84 92 7112/24/2009 85 88 91 91 91 90 92 92 92 86 84 81 77 74 69 66 78 87 88 85 86 84 84 84 84 92 6612/25/2009 84 83 81 86 89 89 84 87 82 78 78 76 74 69 68 70 79 88 91 87 85 83 85 85 82 91 6812/26/2009 87 89 91 81 75 83 82 78 69 67 61 56 50 48 47 49 56 56 56 56 58 58 59 61 66 91 4712/27/2009 63 67 74 75 75 77 78 76 74 72 71 68 66 64 68 70 70 77 80 80 81 78 80 83 74 83 6312/28/2009 79 70 70 71 72 76 76 73 73 71 68 65 62 48 44 59 65 58 63 63 66 72 72 74 67 79 4412/29/2009 75 76 78 88 92 93 94 95 95 96 93 90 92 91 92 92 93 93 91 89 92 95 97 98 91 98 7512/30/2009 98 99 99 99 99 99 99 99 99 97 96 89 82 75 73 71 77 83 86 88 89 87 89 88 90 99 7112/31/2009 91 90 93 94 88 88 85 88 82 74 77 72 66 71 84 86 92 95 97 97 98 98 99 99 88 99 6601/01/2010 98 98 95 87 81 76 74 69 76 75 85 94 83 76 74 74 76 68 69 73 72 74 74 76 79 98 6801/02/2010 80 80 78 84 81 82 84 85 73 76 67 70 66 65 68 70 75 80 81 82 82 80 79 77 77 85 6501/03/2010 81 82 84 85 85 81 76 75 74 72 66 70 70 67 66 65 77 75 63 67 63 67 63 68 73 85 6301/04/2010 59 57 65 70 76 77 78 76 66 68 71 70 67 59 60 60 65 74 75 77 79 77 79 80 70 80 5701/05/2010 75 69 66 64 66 70 63 67 65 61 63 60 58 58 53 54 62 70 70 69 72 69 72 73 65 75 5301/06/2010 69 69 65 66 72 63 67 71 76 74 68 67 61 62 64 67 79 87 91 91 93 92 93 92 75 93 6101/07/2010 94 94 92 93 93 91 92 92 84 81 78 73 69 67 71 75 78 79 81 85 86 87 85 85 83 94 6701/08/2010 88 87 84 86 84 84 81 82 78 73 67 63 66 72 74 76 77 79 81 82 82 84 84 84 79 88 6301/09/2010 89 91 92 91 91 91 92 93 94 86 80 75 72 71 73 76 78 75 77 81 82 86 84 85 83 94 7101/10/2010 85 82 84 88 91 91 92 93 86 81 77 73 70 69 69 68 72 81 86 84 87 84 83 87 82 93 6801/11/2010 89 89 89 91 91 89 89 88 82 81 69 59 55 63 55 53 54 55 52 51 50 50 53 50 69 91 50Avg 83 83 83 84 84 83 83 83 80 78 75 73 69 68 68 70 75 77 78 79 80 81 82 82 78‐‐ ‐‐Max 98 99 100 100 100 99 99 99 99 97 96 94 92 91 92 92 93 95 97 97 98 98 99 99‐‐100‐‐Min 59 57 65 64 62 62 57 60 58 61 60 55 50 48 44 49 54 52 52 51 50 50 53 50‐‐ ‐‐44SAROADforBarrick,GoldstrikeChannel:RH_percentMonth:12/15/09‐01/11/10HourofdayDay 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 Min12/15/2009 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.6 24.6 24.6 24.6 24.7 24.612/16/2009 24.6 24.6 24.6 24.7 24.6 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.612/17/2009 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.712/18/2009 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.712/19/2009 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.7 24.7 24.612/20/2009 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.6 24.512/21/2009 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.4 24.4 24.4 24.4 24.3 24.3 24.3 24.3 24.2 24.3 24.2 24.2 24.2 24.2 24.2 24.4 24.5 24.212/22/2009 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.3 24.3 24.3 24.4 24.4 24.4 24.4 24.4 24.5 24.5 24.5 24.3 24.5 24.212/23/2009 24.5 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.512/24/2009 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.712/25/2009 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.612/26/2009 24.6 24.6 24.6 24.5 24.5 24.5 24.5 24.5 24.6 24.6 24.6 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.6 24.512/27/2009 24.5 24.6 24.5 24.5 24.5 24.5 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.6 24.7 24.512/28/2009 24.7 24.7 24.7 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.6 24.7 24.512/29/2009 24.5 24.5 24.5 24.4 24.4 24.4 24.4 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.4 24.4 24.5 24.4 24.4 24.4 24.4 24.4 24.5 24.412/30/2009 24.4 24.4 24.4 24.4 24.4 24.4 24.4 24.4 24.5 24.5 24.5 24.5 24.5 24.5 24.5 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.7 24.7 24.5 24.7 24.412/31/2009 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.701/01/2010 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.601/02/2010 24.6 24.6 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.601/03/2010 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.701/04/2010 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.7 24.7 24.6 24.6 24.7 24.7 24.7 24.7 24.7 24.601/05/2010 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.7 24.7 24.6 24.7 24.601/06/2010 24.6 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.7 24.7 24.7 24.7 24.7 24.6 24.7 24.601/07/2010 24.6 24.7 24.7 24.6 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.601/08/2010 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.701/09/2010 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.8 24.8 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.8 24.701/10/2010 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.8 24.8 24.8 24.8 24.7 24.8 24.701/11/2010 24.8 24.8 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.7 24.8 24.6Avg 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6 24.6‐‐ ‐‐Max 24.8 24.8 24.7 24.7 24.7 24.7 24.7 24.7 24.8 24.8 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.7 24.8 24.8 24.8 24.8‐‐24.8‐‐Min 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.3 24.3 24.3 24.3 24.2 24.3 24.2 24.2 24.2 24.2 24.2‐‐ ‐‐24.2SAROADforBarrick,GoldstrikeChannel:BP_inHgMonth:12/15/09‐01/11/10HourofdayDay 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 Min12/15/2009‐1.40‐1.74‐1.94‐2.11‐1.28‐0.96‐0.42‐0.60‐0.02 0.26 0.95 1.64 1.99 2.35 2.55 2.41 2.77 3.04 2.49 2.03 2.56 1.58 1.84 3.06 0.88 3.06‐2.1112/16/200912/17/200912/18/2009‐‐ ‐‐ ‐0.85‐1.26‐0.94‐1.19‐0.90‐1.09‐0.51‐0.72 0.88 2.69 4.29 4.37 4.17 3.00 0.88‐0.20‐1.58‐1.09‐1.90‐2.52‐1.63‐2.55 0.06 4.37‐2.5512/19/200912/20/200912/21/2009‐1.51‐1.67‐1.65‐0.94 0.08‐0.20‐‐ ‐‐ ‐‐ ‐‐ ‐‐2.50 2.81 2.69 1.72 0.72 0.40 2.59 1.65 0.15 0.51‐1.13‐1.63‐1.13 0.31 2.81‐1.6712/22/200912/23/200912/24/2009‐12.06‐11.42‐11.95‐12.22‐12.96‐12.32‐12.06‐12.86‐10.69‐7.80‐7.17‐6.77‐5.70‐4.68‐4.48‐5.19‐8.86‐10.12‐9.30‐9.99‐10.52‐10.78‐10.80‐10.41‐9.63‐4.48‐12.9612/25/200912/26/200912/27/2009‐6.98‐7.80‐9.28‐9.26‐9.16‐10.05‐9.23‐8.48‐7.00‐5.51‐4.43‐4.10‐4.09‐2.48‐3.23‐4.03‐4.24‐6.48‐6.32‐6.39‐6.58‐6.51‐7.93‐8.40‐6.58‐2.48‐10.0512/28/200912/29/200912/30/2009‐4.66‐4.63‐4.95‐5.24‐5.12‐5.07‐4.94‐4.46‐3.94‐3.56‐2.84‐2.34‐2.04‐1.60‐1.26‐1.55‐3.45‐4.36‐5.97‐7.12‐7.59‐8.27‐8.33‐7.88‐4.63‐1.26‐8.3312/31/200901/01/201001/02/2010‐0.44‐0.44‐0.62‐1.86‐1.17‐2.07‐3.23‐3.07‐0.68 0.51 3.86 1.98 3.31 2.72 2.28 1.48‐0.57‐1.92‐2.10‐1.95‐1.33‐0.83‐1.35‐2.34‐0.41 3.86‐3.2301/03/201001/04/201001/05/2010‐3.92‐3.12‐2.17‐2.17‐3.01‐3.70‐3.51‐3.77‐3.15‐0.96 0.50 1.38 1.95 2.70 2.16 1.35‐0.06‐0.41‐0.75‐1.50‐1.21‐0.86‐1.40‐1.36‐1.12 2.70‐3.9201/06/201001/07/201001/08/2010‐6.20‐5.85‐6.55‐6.46‐6.71‐6.76‐6.31‐6.84‐5.56‐2.70‐0.60‐0.13‐0.04‐1.86‐2.38‐2.90‐3.07‐3.60‐3.84‐3.65‐3.29‐3.49‐3.46‐3.68‐4.00‐0.04‐6.8401/09/201001/10/201001/11/2010‐0.44‐0.76‐0.96‐1.29‐0.95‐1.65‐1.58‐1.22 0.78 1.41 3.80 5.47 5.94 4.63 5.34 5.45 4.73 4.31 4.27 4.24 4.36 4.20 3.71 4.11 2.41 5.94‐1.65Avg‐4.18‐4.16‐4.09‐4.28‐4.12‐4.40‐4.69‐4.71‐3.42‐2.12‐0.56 0.23 0.84 0.88 0.69 0.07‐1.15‐1.71‐2.14‐2.53‐2.50‐2.86‐3.10‐3.06‐2.27‐‐ ‐‐Max‐0.44‐0.44‐0.62‐0.94 0.08‐0.20‐0.42‐0.60 0.78 1.41 3.86 5.47 5.94 4.63 5.34 5.45 4.73 4.31 4.27 4.24 4.36 4.20 3.71 4.11‐‐5.94‐‐Min‐12.06‐11.42‐11.95‐12.22‐12.96‐12.32‐12.06‐12.86‐10.69‐7.80‐7.17‐6.77‐5.70‐4.68‐4.48‐5.19‐8.86‐10.12‐9.30‐9.99‐10.52‐10.78‐10.80‐10.41‐‐ ‐‐ ‐12.96‐‐IndicatesinvaliddataNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DaySAROADforBarrick,Goldstrike‐HCNStationChannel:T_AMB_CMonth:12/15/09‐01/11/10HourofdayNon‐Run‐DayNon‐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 Min12/15/2009 69 68 68 65 62 61 57 59 57 61 57 53 52 55 62 62 58 66 66 64 76 87 88 78 65 88 5212/16/200912/17/200912/18/2009‐‐ ‐‐88 88 87 89 86 84 83 86 78 68 62 61 63 70 78 84 87 88 88 87 85 87 81 89 6112/19/200912/20/200912/21/2009 72 67 68 66 64 65‐‐ ‐‐ ‐‐ ‐‐ ‐‐63 60 60 64 67 71 51 57 67 65 85 95 99 69 99 5112/22/200912/23/200912/24/2009 85 89 93 91 91 91 93 93 87 81 78 76 70 66 62 65 80 87 87 84 87 83 83 83 83 93 6212/25/200912/26/200912/27/2009 62 67 74 74 75 77 78 73 72 69 67 65 64 60 66 67 70 77 79 80 81 78 81 82 72 82 6012/28/200912/29/200912/30/2009 98 98 99 99 99 98 99 98 96 95 92 84 77 72 69 69 77 82 87 88 88 87 90 89 89 99 6912/31/200901/01/201001/02/2010 78 79 79 84 79 82 84 83 73 70 56 67 60 61 63 66 75 80 80 81 81 78 78 78 75 84 5601/03/201001/04/201001/05/2010 73 67 64 61 66 68 61 66 62 58 59 57 54 53 50 51 61 67 69 68 71 67 71 72 63 73 5001/06/201001/07/201001/08/2010 87 85 84 84 84 82 79 81 78 69 61 60 62 70 73 75 77 79 80 81 82 84 83 84 78 87 6001/09/201001/10/201001/11/2010 89 89 89 92 88 89 88 86 80 79 65 56 52 61 53 52 53 53 50 49 49 49 52 48 67 92 48Avg 79 79 81 80 79 80 80 80 76 74 68 65 61 62 62 64 70 73 74 75 77 78 81 80 74‐‐ ‐‐Max 98 98 99 99 99 98 99 98 96 95 92 84 77 72 73 75 80 87 87 88 88 87 95 99‐‐99‐‐Min 62 67 64 61 62 61 57 59 57 58 56 53 52 53 50 51 53 51 50 49 49 49 52 48‐‐ ‐‐48‐‐IndicatesinvaliddataNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DaySAROADforBarrick,Goldstrike‐HCNStationChannel:RH_percentMonth:12/15/09‐01/11/10HourofdayNon‐Run‐DayNon‐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 Min12/15/2009 624 625 625 625 625 625 625 625 625 626 626 626 625 625 625 626 625 626 626 626 626 626 626 625 625 626 62412/16/200912/17/200912/18/2009‐‐ ‐‐627 627 627 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 62712/19/200912/20/200912/21/2009 622 622 622 622 622 621‐‐ ‐‐ ‐‐ ‐‐ ‐‐620 619 618 618 618 617 616 616 616 616 616 616 615 619 622 61512/22/200912/23/200912/24/2009 628 628 628 628 628 628 628 628 629 628 628 628 628 628 628 628 627 628 627 627 627 627 627 627 628 629 62712/25/200912/26/200912/27/2009 623 623 623 623 623 623 623 624 624 625 625 625 625 625 625 625 625 625 625 626 626 626 626 626 625 626 62312/28/200912/29/200912/30/2009 620 620 620 620 620 620 621 621 621 622 622 622 622 622 623 624 624 625 625 626 626 627 627 627 623 627 62012/31/2009Non‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DaySAROADforBarrick,GoldstrikeChannel:BP_mmHgMonth:12/15/09‐01/11/10Hourofday1/1/20101/2/2010 625 626 626 626 626 626 627 627 627 628 627 627 627 626 626 627 627 627 627 627 627 628 628 628 627 628 6251/3/20101/4/20101/5/2010 626 626 626 626 626 626 626 626 626 627 626 626 626 625 625 625 625 626 626 626 626 626 626 626 626 627 6251/6/20101/7/20101/8/2010 627 627 627 627 627 627 627 626 627 627 627 627 626 626 626 627 627 627 627 627 627 628 628 628 627 628 6261/9/20101/10/20101/11/2010 629 629 629 628 628 628 628 628 628 628 628 627 626 626 626 626 625 625 625 625 625 625 625 624 627 629 624Avg 625 625 625 625 625 625 626 626 626 627 627 626 625 625 625 625 625 625 625 625 625 626 626 625 625‐‐ ‐‐Max 629 629 629 628 628 628 628 628 629 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628‐‐629‐‐Min 620 620 620 620 620 620 621 621 621 622 622 620 619 618 618 618 617 616 616 616 616 616 616 615‐‐ ‐‐615‐‐IndicatesinvaliddataNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐DayNon‐Run‐Day

# APPENDIX B 

# HCN DataPage 1 of 2 Wed, 01/06/10 5:24 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: 9363005 Purchase Order: Client Project ID: 

## Air Sciences, Inc 122909

5955-5

Analytical Results
12/15/2009 12/29/2009 9363005001 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 59551215-1 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

0.21 NA 2.6 

### NA Hydrogen Cyanide



## 12/18/2009 12/29/2009 9363005002 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 59551218-2 

## Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

0.21 NA 3.1 

### NA Hydrogen Cyanide



## 12/21/2009 12/29/2009 9363005003 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 59551221-3 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

0.21 NA 8.8 

### NA Hydrogen Cyanide 

## Sample Comments

9363005001 The back section had a reportable result indicating that the sampler may have been

overloaded. Results may be less than acutal.

9363005002 The back section had a reportable result indicating that the sampler may have been

overloaded. Results may be less than acutal.

9363005003 The back section had a reportable result indicating that the sampler may have been

overloaded. Results may be less than acutal.

IHREP-V9.8Page 2 of 2 Wed, 01/06/10 5:24 PM 

# ANALYTICAL REPORT

Project Manager 

## Rand Potter Workorder: 9363005 Purchase Order: Client Project ID: 

## Air Sciences, Inc 122909

5955-5

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 Wed, 01/06/10 5:24 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: 1000503 Purchase Order: Client Project ID: 

## Air Sciences Inc 010510

59-55-5

Analytical Results
12/24/2009 1/5/2010 1000503001 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 595512242009-1 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

0.21 NA 3.5 

### NA Hydrogen Cyanide



## 12/24/2009 1/5/2010 1000503002 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 595512272009-2 

## Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

0.21 NA 0.76 

### NA Hydrogen Cyanide



## 12/24/2009 1/5/2010 1000503003 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 595512302009-3 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

0.21 NA 7.4 

### NA Hydrogen Cyanide 

## Sample Comments

1000503001 The back section had a reportable result indicating that the sampler may have been

overloaded. Results may be less than acutal.

1000503003 The back section had a reportable result indicating that the sampler may have been

overloaded. Results may be less than acutal.

Workorder Comments

1000503 The samples arrived without identification and the analyst could not determine which sample

tube corresponded to which sample ID. The samples were therefore analyzed and reported according to serial #. Sample # 1000503001 = seria l # 3031300148, sample # 1000503002 = serial # 3031300149 & sample ID 1000503003 = serial # 3031300151.

IHREP-V9.8Page 2 of 2 Wed, 01/06/10 5:24 PM 

# ANALYTICAL REPORT

Project Manager 

## Rand Potter Workorder: 1000503 Purchase Order: Client Project ID: 

## Air Sciences Inc 010510

59-55-5

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 Wed, 01/20/10 1:22 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: 1001517 Purchase Order: Client Project ID: 

## Air Sciences 011510

59-55-5

Analytical Results
1/13/2010 1/15/2010 1001517001 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 5955152010-1 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

0.21 NA 9.0 

### NA Hydrogen Cyanide



## 1/13/2010 1/15/2010 1001517002 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 59551B2010-2 

## Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

0.21 NA 1.8 

### NA Hydrogen Cyanide



## 1/13/2010 1/15/2010 1001517003 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 59551112010-3 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

0.21 NA 2.3 

### NA Hydrogen Cyanide



## 1/13/2010 1/15/2010 1001517004 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 5955122010-3 Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

0.21 NA 6.2 

### NA Hydrogen Cyanide

IHREP-V9.8Page 2 of 2 Wed, 01/20/10 1:22 PM 

# ANALYTICAL REPORT

Project Manager 

## Rand Potter Workorder: 1001517 Purchase Order: Client Project ID: 

## Air Sciences 011510

59-55-5

Analytical Results
1/13/2010 1/15/2010 1001517005 Sample ID:
Lab ID: Media: Collected:
Received: SKC 226-28, Soda Lime-200/600 59551132010-FB Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm 

## NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

0.21 NA <0.21 NA Hydrogen Cyanide



## Workorder Comments

1001517 Samples 1001517001-004 : The back section had a rep ortable result indicating that the

sampler may have been overloaded. Results may be l ess than acutal.

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-V9.8

# APPENDIX C 

# Site Check Forms, Audits, and Calibration

# Calibration Form Barrick Goldstrike A ir Quality and Meteorological Monitoring

Site: Goldstrike Technician: Tom Brauch

Date: Site Conditions: Cold, Clear

Invalid Data Range: Before 12/09/2009 Logger Serial Number: 2957

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 12/09/2009

All sensors were calibrated

12/9/2009
Signature Date: 12/9/2009

59

‐ 55

‐ 12092009CALAQ

‐ MET 1

### Calibration Form 

# Barrick Goldstrike A ir Quality and Meteorological Monitoring

Time: 14:00 to 15:00 PST Time: 14:00 to 15:00 PST

Diff Diff

1.

‐ 8.1 1.

‐ 8.0

‐ 0.1 1. 65 1. 62 3
2.

‐ 8.1 2.

‐ 8.0

‐ 0.1 2. 65 2. 62 3
3.

‐ 8.0 3.

‐ 7.8

‐ 0.2 3. 64 3. 62 2
4.

‐ 8.0 4.

‐ 7.8

‐ 0.2 4. 64 4. 62 2
5.

‐ 8.0 5.

‐ 7.9

‐ 0.1 5. 65 5. 62 3
6.

‐ 7.9 6.

‐ 7.8

‐ 0.1 6. 65 6. 63 2
7.

‐ 7.9 7.

‐ 7.8

‐ 0.1 7. 66 7. 63 3
8.

‐ 8.0 8.

‐ 8.0 0.0 8. 66 8. 63 3
9.

‐ 8.0 9.

‐ 8.0 0.0 9. 65 9. 63 2
10.

‐ 8.0 10.

‐ 7.9

‐ 0.1 10. 65 10. 62 3 Average Difference

‐ 0.1 2.6

Difference = Site ‐ Measured

Time: 14:00 PST

Diff *

1. 620.0 1. 622

‐ 2
2 620.0 2. 622

‐ 2
3. 621.0 3. 622

‐ 1
4. 621.0 4. 622

‐ 1 Average Difference

‐ 1.5

*Difference = Site ‐ Measured SN: D31400101 

### Temperature and Relative Humidity ‐ Co

‐ Located Calibration

Relative Humidity Measured

SN: 80357103

Logger Reading mmHg 

### Barometric Pressure ‐ Co

‐ Located Calibration

SN: NA Barometric Pressure SN: D3250073 VWR Thermo Hygro
SN: D3250073 SN: 80357103 VWR Thermo Hygro HMP45C Logger Temperature
HMP45C Logger Measured

mmHg Measured
Brunton Altimeter

59

‐ 55

‐ 12092009CALAQ

‐ MET 2

### Calibration Form 

# Barrick Goldstrike A ir Quality and Meteorological Monitoring

Time: 14:00 ‐ 15:00 PST

1. 30.82 1. 44.59 1. 43.5 1. 1.35 1. 0.866 1. 0.08291
2. 28.79 2. 40.66 2. 40.5 2. 1.28 2. 0.878 2. 0.07861
3. 24.72 3. 35.74 3. 35.1 3. 1.17 3. 0.893 3. 0.07185
4. 21.68 4. 31.8 4. 30.5 4. 1.07 4. 0.904 4. 0.06571
5. 17.95 5. 25.4 5. 25.2 5. 0.93 5. 0.924 5. 0.05711
6. 13.89 6. 19.98 6. 20.1 6. 0.79 6. 0.940 6. 0.04852
7. 7. 7. 7. 7. 7.
8. 8. 8. 8. 8. 8.
9. 9. 9. 9. 9. 9.
10. 10. 10. 10. 10. 10.
22.975 33.0283 32.4833 1.09833

a Difference = Site ‐ Measured

b Difference = ((Site

– Measured)/Measured)*100

Notes for next trip:

12/9/2009 Signature Date: mV Pressure Transducer Raw Inches Sampler 

### HCN Sampler System

Flow (L/min) Low Flow BIOS
SN: 35542F3 SN: 35583F3 SN: 35545F3 Inches Digital
Manometer

‐ 2.1336 1.0446

‐ 0.9990 SN: 35543F3

Slope Intercept Correlation Tube 1 Flow Tube 2 Flow Tube 3 Flow Temp ( o C) BP (mm Hg)

‐ 8 621

P1/Pa Qa (Flow Meter)

59

‐ 55

‐ 12092009CALAQ

‐ MET 3

# APPENDIX D 

# Hydrogen Cyanide (HCN) Fence Line Monitoring Plans

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

B

ARRICK 

# G OLDSTRIKE 

# M INES


# , I NC



# .

P ROJECT 

## 59-43-70 O

CTOBER 

## 2009Goldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 

### 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

3.2.1 Tailings Impoundment .................................................................................................... ................................. 4 3.2.2 Mill Areas .............................................................................................................. ........................................... 4 3.3 Proposed HCN Monitor Location ............................................................................................. ............................... 4

4 PROPOSED MODIFICATIONS TO THE GENERAL HCN MONITORING PLAN ....................................................... 10



## 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 ..................................................................................... ................................. 6 Figure 3.2: Large Scale Area Map ............................................................................................. ...................................... 7 Figure 3.3: Roaster Mill ..................................................................................................... ............................................... 8 Figure 3.4: Wet Mill ......................................................................................................... ................................................. 9



## Appendices Appendix A: Hydrogen Cyanide (HCN) Fence Line Monitoring PlanGoldstrike Site-Specific Hcn Monitoring Plan_V2.Docx 

### 1 

## SECTION 1 

# INTRODUCTION

1.1 Mine Description and Proposed Monitoring

Barrick Goldstrike Mines, Inc. (Goldstrike) operates a gold mining facility located approximately 23 miles northwest of Carlin, Nevada. The fa cility operates both op en-pit and underground mines. Gold recovery operations include: crushi ng, milling, roasting, autoclaving, tank 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 emissions, Goldstrike plans to install and operate an HCN monitor downwind of the potential HCN sources, just inside the boundary of the Goldstrike 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 Goldst rike. 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 Goldstrike maintenance and project technicians.

The following sections describe the predominant wind direction, the Goldstrike boundary of public access, the nearest population areas to this boundary, the po tential sources of HCN emissions and their locations, and the proposed HCN monitoring 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, Goldstrike will take all reasonable measures to avoid such problems in an effort to minimize any disruptions to the monitoring

program.Goldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 

### 2 

## SECTION 2 

# METEOROLOGY

2.1 Prevailing Wind Direction

Goldstrike currently operates a meteorological station. This station is located at 552,464 meters east, 4,539,909 meters north, UTM Zone 11N, NA D83, elevation 5,546 feet, approximately 1 mile north of the roaster mill. 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 wind rose, no single wind direction accounts for more than 10 percent of th e total hourly wind directions. However, there are slightly more hourly winds from the easterly and westerly directions than the northerly and southerly directions. The quar terly wind roses also do not show a clear prevailing wind direction. However, each quarter shows a slig ht predominance of wind from the easterly
directions.

Figure 2.1: Calendar Year 2008 Wind Rose

2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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 = 120 Missing hours = 0 Number of non-calm/missing hours = 8,664Goldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 

### 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 2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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 Calm hours = 18 Missing hours = 0 Number of non-calm/missing hours = 2,166 2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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 Calm hours = 100 Missing hours = 0 Number of non-calm/missing hours = 2,084

2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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 Calm hours = 0 Missing hours = 0 Number of non-calm/missing hours = 2,208 2%

4%

6%

8%

10%

12%

14%

16%

18%

20% 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 Calm hours = 2 Missing hours = 0 Number of non-calm/missing hours = 2,206Goldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 

### 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 3.4. Figure 3.1 provides an aerial photo of the mine site, the operations boundary, and the potential HCN sources.

Figure 3.2 provides a shaded relief map of the area surrounding the Goldstrike mine. The nearest town is Carlin located approximately 23 miles sout heast of the Goldstrike mine site. The other nearby towns are Elko and Battle Mountain. These towns are located more than 30 miles from
the Goldstrike mine site.



# 3.2 Potential Sources of HCN

Figures 3.1, 3.3, and 3.4 highlight the potential sources of HCN emissions at Goldstrike. These sources include an active and an inactive tailings impoundment, tanks at the roaster mill area,
and stacks and tanks at the wet mill area. Closer views of the HCN sources at the mill areas are shown in Figures 3.3 and 3.4.


# 3.2.1 Tailings Impoundment
Spent cyanide solution used in the mills to extrac t gold in the Carbon-in-Leach (CIL) tanks is first sent to a cyanide kill system and then discharg ed to the active tailings impoundment. The residual cyanide in the tails solution has the po tential to produce HCN air emissions from both the standing water within the impoundment and the wetted tailings material around the water. The tailings impoundments are shown in Figure 3.1.



# 3.2.2 Mill Areas
The roaster mill area, shown in Figure 3.3, contains tank sources of HCN emissions. The tank sources are the six CIL tanks, which are open to the atmosphere at the top. The wet mill area, shown in Figure 3.4, contains stack and tank sources of HCN emissions. The stack sources include the electrowinning cells and the pregnant and barren tanks. The tank sources are the 16 CIL tanks, which are open to the atmosphere at th e top. As discussed above, these processes use aqueous cyanide solutions, which have the potential for HCN emissions.


# 3.3 Proposed HCN Monitor Location

As discussed in Section 2.1, there appears to be a slight predominance of winds from the easterly directions. As discussed in Section 3.1, there are no nearby towns to consider for the monitor placement. Therefore, Goldstrike proposes to place the HCN monitor at the existing meteorological station, located to the west of the active tails pond. This location should provide a conservatively high assessment of ambient HCN concentrations as it is located inside theGoldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 

### 5 

## operations area boundary and less than one mile from the active tailings impoundment. See Figure 3.1.

The proposed monitor location has line power and can be reached via a road maintained by Goldstrike. The proposed site coordinates are 552,464 meters east, 4,539,909 meters north, UTM Zone 11N, NAD83, elevation 5,546 feet.Goldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 

### 10 

## SECTION 4 

# PROPOSED MODIFICATIONS TO THE GENERAL HCN MONITORING PLAN

Goldstrike does not propose any modifications to the General HCN Monitoring Plan with regards to the HCN sampling equipment. Goldstri ke does, however, propose to use its existing meteorological station to collect the meteorological parameters outlined in the General HCN Monitoring Plan in lieu of installing the meteor ological measurement equipment described in the general plan.

The existing station is located at the proposed HC N monitor site and, therefore, it will provide representative data for the overall mine and the monitor site. See Figure 3.1. The sensors for wind direction, wind speed, ambi ent temperature, relative humidi ty, and barometric pressure at the existing meteorological station meet the data quality objectives and criteria described in Section 2.1 of the General HCN Monitoring Plan. The existing station is also audited on a quarterly basis.

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 Design
The 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