Meteorological and 

Hydrogen Cyanide 

(HCN) Fence Line 

Monitoring Report 

BARRICK GOLDSTRIKE MINES,

INC. 

PROJECT 59-55-4 

JANUARY 2010 
Goldstrike 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 ANALYSIS ..................................................................................................................................................... 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 Highest Percent of Winds Blowing Towards Monitor) ..... 17 

Appendices 

Appendix A: Hourly Meteorological Data

Appendix B: HCN Data

Appendix C: Site Check Forms, Audits, and Calibration

Appendix D: Hydrogen Cyanide (HCN) Fence Line Monitoring Plans 
Goldstrike 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. (Goldstrike) 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 Meteorological 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 north, UTM Zone 11N, NAD83, elevation 5,546 feet. 

Figures 1, 3, and 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 

and 4. 
Goldstrike Hcn Monitoring Report_R2.Docx 2
Goldstrike Hcn Monitoring Report_R2.Docx 3
Goldstrike Hcn Monitoring Report_R2.Docx 4
Goldstrike Hcn Monitoring Report_R2.Docx 5
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 sampling 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 are collected at more frequent intervals and timeaveraged into 15-minute values. Wind speed and wind 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 transferred 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 parameters are digitally processed by the DAS into 15-

minute averages. The 15-minute averages are transmitted 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 parameters are presented in Table 2. 

The meteorological data recovery rate was 100 percent for all parameters at the meteorological station 

and 97.1 percent at the HCN monitor. The lower data 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 sorbent 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, temperature, relative humidity, and barometric 

pressure data collected at the meteorological station 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 during the sampling period are summarized in Table 3 

as frequency distributions of winds by direction and speed. The data period contains 28 days (672 

hours) of complete wind information. 

Figure 5 shows the distribution of hourly averaged 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 percent 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 averaged winds by direction 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, which 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 Averaged 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 = 621
Goldstrike Hcn Monitoring Report_R2.Docx 11 

2.2 Temperature, Relative Humidity, 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 sampling 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 was 24.8 inHg (629.9 mmHg) and occurred for two 

consecutive hours in the morning of January 9, 2010, 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 barometric 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 eighteen 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 24.2 
Goldstrike 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 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. 

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 Humidity, 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 sampling 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 barometric 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 48 615 
Goldstrike Hcn Monitoring Report_R2.Docx 13 

3.3 HCN Concentration 

The HCN concentration data collected during the sampling period are summarized in Table 7. The 

average HCN concentration corrected to standard conditions1 was 3.41 μg/m3. The minimum HCN 

concentration for the period was 0.50 μg/m3 and occurred on December 27, 2009. The maximum 

HCN concentration for the period was 7.94 μg/m3 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/m3

) 

 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/m3.

2 Rounding the measured 

average HCN concentration from Table 7 of 3.41 μg/m3 to one significant figure, consistent with the 

EPA reference concentration, yields 3E-3 mg/m3. Thus, the rounded HCN concentration is equal to 

the reference concentration. 

It is important to note that the HCN monitor is located approximately 0.2 miles inside the operations 

area boundary and less than one mile from the active tailings impoundment and roaster mill. See 

Figure 1. The monitor location was chosen to provide a conservatively high estimate of the ambient 

HCN concentrations to which the public could be exposed. 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 potential 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 System. http://www.epa.gov/iris/subst/0060.htm. 
Goldstrike Hcn Monitoring Report_R2.Docx 14 

The maximum measured HCN concentration of 7.94 μg/m3 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/m3).3 In addition, the EPA reference concentration of 3 μg/m3

was developed with a total uncertainty factor of 1,000, where the Lowest Observed Adverse Effect 

Level (LOAEL) was 7,070 μg/m3.

2 

 

3 Occupational Safety and Health Guideline for Hydrogen Cyanide. 

http://www.osha.gov/SLTC/healthguidelines/hydrogencyanide/recognition.html 
Goldstrike Hcn Monitoring Report_R2.Docx 15 

SECTION 4 

DATA ANALYSIS 

Based on the data collected from the first four weeks of monitoring, an analysis 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 lowest 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/m3) 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 3.41 
Goldstrike Hcn Monitoring Report_R2.Docx 16 

Figure 6: Measured HCN Concentration Analysis 

Figures 7 and 8 summarize the 24-hour wind direction (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 percent of winds blowing towards the monitor was on 

December 15, 2009, when all but two hours of wind 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

9.0

Percent of Winds (%)

HCN Concentration (μg/m3)

Run Day

HCN Concentration Percentof Winds Towards Monitor
Goldstrike 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 Data 
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 

12/15/2009 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 12/16/2009 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 12/17/2009 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 12/18/2009 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 12/19/2009 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 12/20/2009 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 12/21/2009 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 12/22/2009 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 12/23/2009 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 12/24/2009 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 12/25/2009 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 12/26/2009 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 12/27/2009 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 12/28/2009 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 12/29/2009 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 12/30/2009 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 12/31/2009 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 01/01/2010 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 01/02/2010 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 01/03/2010 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 01/04/2010 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 01/05/2010 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 01/06/2010 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 01/07/2010 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 01/08/2010 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 01/09/2010 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 01/10/2010 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 01/11/2010 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 

Avg 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 

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 

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 

SAROAD for Barrick, Goldstrike

Channel: WS_ms_10m

Month: 12/15/09 ‐ 01/11/10

Hour of da

y
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

12/15/2009 138 138 136 115 128 125 127 111 158 43 181 151 136 135 123 136 119 137 189 163 169 12/16/2009 130 114 115 167 145 109 148 62 129 149 126 182 224 144 291 321 257 59 92 73 61 12/17/2009 86 55 262 55 71 103 39 122 197 225 222 244 261 273 203 121 54 51 103 177 52 12/18/2009 104 269 266 39 77 139 104 69 230 265 266 250 251 254 252 261 64 98 56 148 88 12/19/2009 99 146 11 60 79 123 225 152 198 278 238 202 279 204 257 314 69 353 185 14 63 12/20/2009 55 31 36 360 359 167 179 271 167 272 237 225 269 282 287 228 140 150 61 191 213 12/21/2009 68 75 72 156 141 164 249 166 282 225 281 212 230 287 266 348 79 116 162 98 92 12/22/2009 212 206 243 276 312 350 341 351 353 351 349 347 346 352 352 352 353 9 0 352 352 12/23/2009 340 347 22 36 353 53 56 53 73 142 255 246 256 244 259 266 14 37 103 64 56 12/24/2009 47 211 350 146 59 84 272 53 245 235 210 253 261 260 242 243 11 51 281 41 71 12/25/2009 207 23 229 251 97 42 57 228 38 224 207 208 264 270 264 264 11 64 52 57 44 12/26/2009 73 23 51 67 226 53 2 122 201 160 130 107 127 139 147 128 99 92 99 93 271 12/27/2009 267 234 48 303 245 26 59 10 180 212 215 230 254 102 263 305 268 281 116 30 73 12/28/2009 86 232 264 302 10 214 234 246 321 292 261 236 226 143 118 313 226 237 278 194 250 12/29/2009 324 118 319 26 53 110 240 277 276 264 269 228 266 246 172 163 135 164 113 123 157 12/30/2009 185 176 253 340 117 316 261 206 197 234 262 264 269 284 289 280 290 30 9 77 99 12/31/2009 92 123 117 130 130 119 122 146 140 165 203 205 210 236 125 129 83 118 100 91 67 01/01/2010 3 93 350 199 111 130 114 135 224 124 133 99 107 119 126 152 191 142 157 141 129 01/02/2010 49 59 223 96 60 61 80 67 83 50 151 218 197 202 151 150 126 131 91 66 48 01/03/2010 70 75 83 87 111 68 69 83 221 181 186 213 222 258 204 247 18 175 81 126 36 01/04/2010 94 248 257 20 184 219 214 215 217 215 208 214 262 250 243 239 10 15 74 227 81 01/05/2010 59 49 278 69 210 43 37 254 68 231 249 228 224 220 262 304 42 182 33 77 111 01/06/2010 179 76 82 155 57 135 174 118 151 203 210 270 270 284 245 241 236 20 138 72 110 01/07/2010 35 5 57 212 345 270 64 73 240 266 317 335 298 272 292 272 120 124 95 32 41 01/08/2010 48 58 28 45 46 45 349 291 237 339 225 197 265 267 261 277 187 225 328 301 129 01/09/2010 315 59 212 238 49 237 56 176 19 53 211 212 264 270 262 142 131 81 185 147 178 01/10/2010 66 345 197 258 9 62 234 358 75 204 245 182 200 253 286 268 0 53 51 196 71 01/11/2010 64 113 184 242 75 29 117 68 140 304 128 142 143 182 144 137 139 138 124 124 126 

Avg 125 132 169 159 138 128 151 160 181 211 221 218 235 230 228 236 124 119 120 125 116 

Max 340 347 350 360 359 350 349 358 353 351 349 347 346 352 352 352 353 353 328 352 352 

Min 3 5 11 20 9 26 2 10 19 43 126 99 107 102 118 121 0 9 0 14 36 

SAROAD for Barrick, Goldstrike

Channel: WD_10m

Month: 12/15/09 ‐ 01/11/10

Hour of da

y
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 

12/15/2009 ‐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 

12/16/2009 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 12/17/2009 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 

12/18/2009 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 

12/19/2009 ‐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 

12/20/2009 ‐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 

12/21/2009 ‐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 

12/22/2009 ‐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 

12/23/2009 ‐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 

12/24/2009 ‐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 

12/25/2009 ‐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 

12/26/2009 ‐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 

12/27/2009 ‐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 

12/28/2009 ‐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 

12/29/2009 ‐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 

12/30/2009 ‐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 

12/31/2009 ‐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 

01/01/2010 ‐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 

01/02/2010 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 

01/03/2010 ‐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 

01/04/2010 ‐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 

01/05/2010 ‐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 

01/06/2010 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 

01/07/2010 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 

01/08/2010 ‐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 

01/09/2010 ‐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 

01/10/2010 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 01/11/2010 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 

Avg ‐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 

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 

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 

SAROAD for Barrick, Goldstrike

Channel: Temp_C

Month: 12/15/09 ‐ 01/11/10

Hour of da

y
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

12/15/2009 70 69 70 66 62 62 57 60 58 64 60 55 54 57 63 63 59 66 66 66 77 12/16/2009 69 77 72 71 71 75 80 88 86 79 76 72 72 75 76 77 84 88 84 80 79 12/17/2009 84 83 86 87 89 88 89 86 83 81 79 73 72 68 67 73 76 81 81 81 82 12/18/2009 82 86 88 90 88 90 89 86 86 88 85 75 69 67 67 71 78 84 87 89 89 12/19/2009 91 90 92 94 92 91 89 91 91 91 90 86 80 78 79 83 84 88 85 83 83 12/20/2009 92 91 89 90 90 88 88 89 88 83 83 85 83 81 84 85 87 75 80 82 86 12/21/2009 72 69 70 68 65 65 70 68 72 72 68 65 63 63 66 68 72 52 58 68 66 12/22/2009 98 99 100 100 100 97 88 85 79 79 71 71 71 71 70 73 76 78 81 85 81 12/23/2009 88 90 89 90 90 90 91 92 88 84 82 80 77 75 74 71 76 82 81 84 82 12/24/2009 85 88 91 91 91 90 92 92 92 86 84 81 77 74 69 66 78 87 88 85 86 12/25/2009 84 83 81 86 89 89 84 87 82 78 78 76 74 69 68 70 79 88 91 87 85 12/26/2009 87 89 91 81 75 83 82 78 69 67 61 56 50 48 47 49 56 56 56 56 58 12/27/2009 63 67 74 75 75 77 78 76 74 72 71 68 66 64 68 70 70 77 80 80 81 12/28/2009 79 70 70 71 72 76 76 73 73 71 68 65 62 48 44 59 65 58 63 63 66 12/29/2009 75 76 78 88 92 93 94 95 95 96 93 90 92 91 92 92 93 93 91 89 92 12/30/2009 98 99 99 99 99 99 99 99 99 97 96 89 82 75 73 71 77 83 86 88 89 12/31/2009 91 90 93 94 88 88 85 88 82 74 77 72 66 71 84 86 92 95 97 97 98 01/01/2010 98 98 95 87 81 76 74 69 76 75 85 94 83 76 74 74 76 68 69 73 72 01/02/2010 80 80 78 84 81 82 84 85 73 76 67 70 66 65 68 70 75 80 81 82 82 01/03/2010 81 82 84 85 85 81 76 75 74 72 66 70 70 67 66 65 77 75 63 67 63 01/04/2010 59 57 65 70 76 77 78 76 66 68 71 70 67 59 60 60 65 74 75 77 79 01/05/2010 75 69 66 64 66 70 63 67 65 61 63 60 58 58 53 54 62 70 70 69 72 01/06/2010 69 69 65 66 72 63 67 71 76 74 68 67 61 62 64 67 79 87 91 91 93 01/07/2010 94 94 92 93 93 91 92 92 84 81 78 73 69 67 71 75 78 79 81 85 86 01/08/2010 88 87 84 86 84 84 81 82 78 73 67 63 66 72 74 76 77 79 81 82 82 01/09/2010 89 91 92 91 91 91 92 93 94 86 80 75 72 71 73 76 78 75 77 81 82 01/10/2010 85 82 84 88 91 91 92 93 86 81 77 73 70 69 69 68 72 81 86 84 87 01/11/2010 89 89 89 91 91 89 89 88 82 81 69 59 55 63 55 53 54 55 52 51 50 

Avg 83 83 83 84 84 83 83 83 80 78 75 73 69 68 68 70 75 77 78 79 80 

Max 98 99 100 100 100 99 99 99 99 97 96 94 92 91 92 92 93 95 97 97 98 

Min 59 57 65 64 62 62 57 60 58 61 60 55 50 48 44 49 54 52 52 51 50 

SAROAD for Barrick, Goldstrike

Channel: RH_percent

Month: 12/15/09 ‐ 01/11/10

Hour of da

y
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

12/15/2009 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 12/16/2009 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 12/17/2009 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 12/18/2009 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 12/19/2009 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 12/20/2009 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 12/21/2009 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 12/22/2009 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 12/23/2009 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 12/24/2009 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 12/25/2009 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 12/26/2009 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 12/27/2009 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 12/28/2009 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 12/29/2009 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 12/30/2009 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 12/31/2009 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 01/01/2010 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 01/02/2010 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 01/03/2010 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 01/04/2010 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 01/05/2010 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 01/06/2010 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 01/07/2010 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 01/08/2010 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 01/09/2010 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 01/10/2010 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 01/11/2010 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 

Avg 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 

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 

SAROAD for Barrick, Goldstrike

Channel: BP_inHg

Month: 12/15/09 ‐ 01/11/10

Hour of da

y
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 

12/15/2009 ‐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 

12/16/200912/17/200912/18/2009 ‐‐ ‐‐ ‐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 

12/19/200912/20/200912/21/2009 ‐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 

12/22/200912/23/200912/24/2009 ‐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 ‐10.7

12/25/200912/26/200912/27/2009 ‐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 ‐6.5

12/28/200912/29/200912/30/2009 ‐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 

12/31/200901/01/201001/02/2010 ‐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 

01/03/201001/04/201001/05/2010 ‐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 ‐0.8

01/06/201001/07/201001/08/2010 ‐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 

01/09/201001/10/201001/11/2010 ‐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 

Avg ‐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 

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 

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 ‐10.7

‐‐Indicates invalid data

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

SAROAD for Barrick, Goldstrike ‐ HCN Station

Channel: T_AMB_C

Month: 12/15/09 ‐ 01/11/10

Hour of da

y

Non‐Run‐DayNon‐Run‐Day
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

12/15/2009 69 68 68 65 62 61 57 59 57 61 57 53 52 55 62 62 58 66 66 64 76 12/16/200912/17/200912/18/2009 ‐‐ ‐‐ 88 88 87 89 86 84 83 86 78 68 62 61 63 70 78 84 87 88 88 

12/19/200912/20/200912/21/2009 72 67 68 66 64 65 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 63 60 60 64 67 71 51 57 67 65 

12/22/200912/23/200912/24/2009 85 89 93 91 91 91 93 93 87 81 78 76 70 66 62 65 80 87 87 84 87 12/25/200912/26/200912/27/2009 62 67 74 74 75 77 78 73 72 69 67 65 64 60 66 67 70 77 79 80 81 12/28/200912/29/200912/30/2009 98 98 99 99 99 98 99 98 96 95 92 84 77 72 69 69 77 82 87 88 88 12/31/200901/01/201001/02/2010 78 79 79 84 79 82 84 83 73 70 56 67 60 61 63 66 75 80 80 81 81 01/03/201001/04/201001/05/2010 73 67 64 61 66 68 61 66 62 58 59 57 54 53 50 51 61 67 69 68 71 01/06/201001/07/201001/08/2010 87 85 84 84 84 82 79 81 78 69 61 60 62 70 73 75 77 79 80 81 82 01/09/201001/10/201001/11/2010 89 89 89 92 88 89 88 86 80 79 65 56 52 61 53 52 53 53 50 49 49 

Avg 79 79 81 80 79 80 80 80 76 74 68 65 61 62 62 64 70 73 74 75 77 

Max 98 98 99 99 99 98 99 98 96 95 92 84 77 72 73 75 80 87 87 88 88 

Min 62 67 64 61 62 61 57 59 57 58 56 53 52 53 50 51 53 51 50 49 49 

‐‐Indicates invalid data

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

SAROAD for Barrick, Goldstrike ‐ HCN Station

Channel: RH_percent

Month: 12/15/09 ‐ 01/11/10

Hour of da

y

Non‐Run‐DayNon‐Run‐Day
Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

12/15/2009 624 625 625 625 625 625 625 625 625 626 626 626 625 625 625 626 625 626 626 626 626 12/16/200912/17/200912/18/2009 ‐‐ ‐‐ 627 627 627 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 628 12/19/200912/20/200912/21/2009 622 622 622 622 622 621 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 620 619 618 618 618 617 616 616 616 616 

12/22/200912/23/200912/24/2009 628 628 628 628 628 628 628 628 629 628 628 628 628 628 628 628 627 628 627 627 627 12/25/200912/26/200912/27/2009 623 623 623 623 623 623 623 624 624 625 625 625 625 625 625 625 625 625 625 626 626 12/28/200912/29/200912/30/2009 620 620 620 620 620 620 621 621 621 622 622 622 622 622 623 624 624 625 625 626 626 12/31/2009

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

SAROAD for Barrick, Goldstrike

Channel: BP_mmHg

Month: 12/15/09 ‐ 01/11/10

Hour of day

1/1/20101/2/2010 625 626 626 626 626 626 627 627 627 628 627 627 627 626 626 627 627 627 627 627 627 1/3/20101/4/20101/5/2010 626 626 626 626 626 626 626 626 626 627 626 626 626 625 625 625 625 626 626 626 626 1/6/20101/7/20101/8/2010 627 627 627 627 627 627 627 626 627 627 627 627 626 626 626 627 627 627 627 627 627 1/9/2010

1/10/20101/11/2010 629 629 629 628 628 628 628 628 628 628 628 627 626 626 626 626 625 625 625 625 625 

Avg 625 625 625 625 625 625 626 626 626 627 627 626 625 625 625 625 625 625 625 625 625 

Max 629 629 629 628 628 628 628 628 629 628 628 628 628 628 628 628 628 628 628 628 628 

Min 620 620 620 620 620 620 621 621 621 622 622 620 619 618 618 618 617 616 616 616 616 

‐‐Indicates invalid data

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day

Non‐Run‐DayNon‐Run‐Day

Non‐Run‐Day

Non‐Run‐Day
APPENDIX B 

HCN Data 
Page 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

9363005001 12/29/2009

Sample ID:

Lab ID:

Media: Collected:

Received:

59551215-1 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

Hydrogen Cyanide 2.6 NA NA 0.21

12/18/2009

9363005002 12/29/2009

Sample ID:

Lab ID:

Media: Collected:

Received:

59551218-2 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

Hydrogen Cyanide 3.1 NA NA 0.21

12/21/2009

9363005003 12/29/2009

Sample ID:

Lab ID:

Media: Collected:

Received:

59551221-3 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

Hydrogen Cyanide 8.8 NA NA 0.21

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-V9.8
Page 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 Laboratories, 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 unless otherwise noted.

Samples have not been blank corrected unless otherwise noted.

This test report shall not be reproduced, except in full, without written approval of ALS Laboratory Group.

ALS Laboratory Group is accredited by AIHA for specific fields of testing as documented in its current scope of accreditation

(ID#101574) which is available on request by contacting your project manager or view on the internet at http://www.aiha.org. The

quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group regardless of this current

scope of accreditation which does not include performance based methods, modified methods, and methods applied to matrices

not listed in the methods.

ALS DataChem provides professional analytical services for all samples submitted. ALS Laboratory Group is not in a position to

interpret the data and assumes no responsibility for the quality of the samples submitted.

All quality control samples processed with the samples in this report yielded acceptable results unless otherwise noted.

General Lab Comments

LOD = Limit of Detection = MDL = Method Detection Limit, A statistical estimate of method/media/instrument sensitivity.

LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensitivity.

ND = Not Detected, Testing result not detected above the LOD or LOQ.

** No result could be reported, see sample comments for details.

< This testing result is less than the numerical value.

( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values at or above the LOQ.

Definitions

IHREP-V9.8

Page 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

1000503001 1/5/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

595512242009-1 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

Hydrogen Cyanide 3.5 NA NA 0.21

12/24/2009

1000503002 1/5/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

595512272009-2 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

Hydrogen Cyanide 0.76 NA NA 0.21

12/24/2009

1000503003 1/5/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

595512302009-3 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/6/2010

RL (ug/sample)

Hydrogen Cyanide 7.4 NA NA 0.21

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 = serial # 3031300148, sample # 1000503002 =

serial # 3031300149 & sample ID 1000503003 = serial # 3031300151.

IHREP-V9.8
Page 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 Laboratories, 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 unless otherwise noted.

Samples have not been blank corrected unless otherwise noted.

This test report shall not be reproduced, except in full, without written approval of ALS Laboratory Group.

ALS Laboratory Group is accredited by AIHA for specific fields of testing as documented in its current scope of accreditation

(ID#101574) which is available on request by contacting your project manager or view on the internet at http://www.aiha.org. The

quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group regardless of this current

scope of accreditation which does not include performance based methods, modified methods, and methods applied to matrices

not listed in the methods.

ALS DataChem provides professional analytical services for all samples submitted. ALS Laboratory Group is not in a position to

interpret the data and assumes no responsibility for the quality of the samples submitted.

All quality control samples processed with the samples in this report yielded acceptable results unless otherwise noted.

General Lab Comments

LOD = Limit of Detection = MDL = Method Detection Limit, A statistical estimate of method/media/instrument sensitivity.

LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensitivity.

ND = Not Detected, Testing result not detected above the LOD or LOQ.

** No result could be reported, see sample comments for details.

< This testing result is less than the numerical value.

( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values at or above the LOQ.

Definitions

IHREP-V9.8

Page 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

1001517001 1/15/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

5955152010-1 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

Hydrogen Cyanide 9.0 NA NA 0.21

1/13/2010

1001517002 1/15/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

59551B2010-2 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

Hydrogen Cyanide 1.8 NA NA 0.21

1/13/2010

1001517003 1/15/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

59551112010-3 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

Hydrogen Cyanide 2.3 NA NA 0.21

1/13/2010

1001517004 1/15/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

5955122010-3 SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

Hydrogen Cyanide 6.2 NA NA 0.21

IHREP-V9.8
Page 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

1001517005 1/15/2010

Sample ID:

Lab ID:

Media: Collected:

Received:

59551132010-FB SKC 226-28, Soda Lime-200/600

Sampling Location: Goldstrike

Method:

Analyte ug/sample mg/m3 ppm

NIOSH 6010 Analyzed: 1/19/2010

RL (ug/sample)

Hydrogen Cyanide <0.21 NA NA 0.21

Workorder Comments

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

sampler may have been overloaded. Results may be less 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 Laboratories, 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 unless otherwise noted.

Samples have not been blank corrected unless otherwise noted.

This test report shall not be reproduced, except in full, without written approval of ALS Laboratory Group.

ALS Laboratory Group is accredited by AIHA for specific fields of testing as documented in its current scope of accreditation

(ID#101574) which is available on request by contacting your project manager or view on the internet at http://www.aiha.org. The

quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group regardless of this current

scope of accreditation which does not include performance based methods, modified methods, and methods applied to matrices

not listed in the methods.

ALS DataChem provides professional analytical services for all samples submitted. ALS Laboratory Group is not in a position to

interpret the data and assumes no responsibility for the quality of the samples submitted.

All quality control samples processed with the samples in this report yielded acceptable results unless otherwise noted.

General Lab Comments

LOD = Limit of Detection = MDL = Method Detection Limit, A statistical estimate of method/media/instrument sensitivity.

LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensitivity.

ND = Not Detected, Testing result not detected above the LOD or LOQ.

** No result could be reported, see sample comments for details.

< This testing result is less than the numerical value.

( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values at or above the LOQ.

Definitions

IHREP-V9.8


APPENDIX C 

Site Check Forms, Audits, and Calibration 
Calibration Form

Barrick Goldstrike Air 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 Air 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 Air 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: SN: 35545F3 35583F3

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 

BARRICK GOLDSTRIKE MINES,

INC. 

PROJECT 59-43-70 

OCTOBER 2009 
Goldstrike 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 Plan 

 
Goldstrike 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 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 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 sampling 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 Appendix 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 Goldstrike. 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 potential 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 order to identify system design problems, and refine 

the system configuration and operating and maintenance 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, NAD83, 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 the total hourly wind directions. However, there 

are slightly more hourly winds from the easterly and westerly directions than the northerly and 

southerly directions. The quarterly wind roses also do not show a clear prevailing wind 

direction. However, each quarter shows a slight 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 = 8,664
Goldstrike 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 = 2,206
Goldstrike Site-Specific Hcn Monitoring Plan_V1.Docx 4 

SECTION 3 

PROPOSED HCN MONITORING SITE 

3.1 Operations Boundary and 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 southeast 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 extract gold in the Carbon-in-Leach (CIL) tanks is first 

sent to a cyanide kill system and then discharged to the active tailings impoundment. The 

residual cyanide in the tails solution has the potential 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 the 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 the 
Goldstrike 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. 

 
6
7
8
9
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. Goldstrike 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 meteorological measurement equipment described in the 

general plan. 

The existing station is located at the proposed HCN 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, ambient temperature, relative humidity, 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 

NEVADA MINING ASSOCIATION

PROJECT 59-43-70 

OCTOBER 2009 
Hcn 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, INSPECTION, 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 ................................................................................................. 21 
Hcn 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 6010
Hcn 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 developed 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 Systems 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 2 
Hcn 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 under 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 notes and anomalies, and 

• Corrective actions taken (if any). 

After the first four weeks of sampling, preliminary 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 and federal guidelines are strictly defined for 

meteorology but not for HCN. The equipment selection 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 plan submitted by each mine will address the 

proposed location of the meteorological monitoring 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 Campbell Scientific 019ALU 

Pyranometer mounting arm Campbell Scientific 015ARM 

Data logger CR3000 Campbell Scientific CR23X or CR10X 

Power supply with battery Campbell Scientific PS12LA 

Solar panel Campbell Scientific MSX10R 

Wind sensor R.M. Young 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 Transducer 
Hcn 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 instrumentation 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 exceed 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 architecture. 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 months of data and will 

provide a backup of the data and the CR3000 program 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 sensor of the Model 05305 is a helicoid-shaped, fourblade propeller. Rotation of the 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 platinum 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 radiation. 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 HUMICAPTM 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 the relative humidity sensor is 15 seconds. 

5.1.9 Barometric Pressure 

Barometric pressure is measured every 15 minutes using a Vaisala PT101B sensor. The sensor is 

mounted inside the data logger enclosure. Barometric pressure is measured by the data logger 

using Vaisala’s Barocap silicon capacitive pressure 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. The 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 passed through the sorbent tubes. Data collection 

is in twenty-four hour increments. Upon complete exposure of a sorbent tube, it is sealed and 
Hcn 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 consists 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 designed 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 volume of the sorbent tube and necessary to reach 

the required limits of detection. 

A data logger turns the pump on and off and controls 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 also 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, showing 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 VALVE
Hcn 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 VALVE
Hcn 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 and 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 analyzed using spectroscopy. One in every five 

sorbent tubes will be a field blank. 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 VALVE
Hcn Sampling Plan_V7.Docx 12 

The detection limit for this HCN sampling method is reported to be approximately 0.2 ppb1, 

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 communications 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 day 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 gold 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 System Failure Response 

The primary mechanism for ensuring normal system operation will be comprised of on-site 

checks conducted after the tubes have been sampled 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 Requirements 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 Method 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 cyanide 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 provided 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 out 
Hcn 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 accomplished 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 Campbell 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 Check Forms and compare them to the 15-minute data 

averages to ensure proper system operation and data transfer. 

7.2 Instrument Calibration and Frequency 

The following section outlines the preventive maintenance/recalibration of the equipment used 

to test the performance of the on-site systems. 

7.2.1 Calibration Equipment 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 Records and Traceability 

Calibration Forms are completed and maintained by project personnel. All Calibration Forms 

indicate the sensor calibrated, its serial number, 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 data 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 assurance 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 deviation 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 placed 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

S i Sin

N

V

1

1 θ

= ∑

N

C Cos i 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 σ θ1 = ArcSin ε 1+ 0.1547ε

 where, [ ] (() () ) 2

1

2 2 1 = − VS + VC 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 invalid, 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/m3 @ 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 (Sr): 0.041 @ 10 to 50 mg per sample [1]

ACCURACY

RANGE STUDIED: 2 to 15 mg/m3 [1]

(3-L samples)

BIAS: Not significant

OVERALL PRECISION (Sˆ

rT): 0.076 [1]

ACCURACY: ± 15.0%

APPLICABILITY: The working range is 0.3 to 235 ppm (3 to 260 mg/m3) 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 and

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

AgNO3 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 (Wf) and back (Wb)

sorbent sections and in the average media blank front (Bf) and back (Bb) sorbent sections. If

Wb > Wf/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/m3 for a 3-L air sample. Twenty-two samples collected at 0.2 L/min for 15 minutes

indicated overall precision Sˆ

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/m3. 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

(AgNO3) solution. The end point is the first formation of a white precipitate, Ag[Ag(CN) 2]. Calculate the

cyanide concentration with the following equation:

Mc = 52.04 Va (Ma/Vc)

Where Mc = cyanide concentration (mg/mL)

Va = volume (mL) of standard silver nitrate solution

Ma = concentration (moles/L) of standard silver nitrate solution

Vc = volume (mL) of calibration stock solution titrated

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