# COLORADO

ANNUAL MONITORING

NETWORK PLAN

2009 - 2010

Prepared by the Air Pollu tion Control Division

Technical Services Program

June 30, 2009

# Table of Contents

INTRODUCTION

.............................................................................................................................. ...... 1

PURPOSE OF THE NETWORK PLAN

.............................................................................................. 1

Overview

.............................................................................................................................. ............ 1

APCD Monitoring Operations

.......................................................................................................... 1

Network Modification Procedures

.................................................................................................... 1

CARBON MONOXIDE

.......................................................................................................................... 14

Larimer and Weld Counties

........................................................................................................... 14

Metropolitan Denver Counties

....................................................................................................... 14

El Paso, Park & Teller Counties

.................................................................................................... 14

Western Counties

.......................................................................................................................... 14

Quality Assurance Checks for Carbon Monoxide Monitors

........................................................... 15

Planned Changes in Carbon Monoxide Monitoring for 2009

......................................................... 15

OZONE

.............................................................................................................................. ................... 16

Larimer and Weld Counties

........................................................................................................... 16

Metropolitan Denver Counties

....................................................................................................... 16

El Paso, Park & Teller Counties

.................................................................................................... 17

Western Counties

.......................................................................................................................... 17

Quality Assurance Checks for Ozone Monitors

............................................................................. 17

Planned Changes in Ozone Monitoring for 2009/2010

.................................................................. 18

NITROGEN DIOXIDE

........................................................................................................................... 19

Metropolitan Denver Counties

....................................................................................................... 19

Quality Assurance Checks for Oxides of Nitrogen Monitors

.......................................................... 19

Planned Changes in Nitrogen Dioxide Monitoring for 2009/2010

.................................................. 19

SULFUR DIOXIDE

................................................................................................................................ 20

Metropolitan Denver Counties

....................................................................................................... 20

Quality Assurance Checks for Sulfur Dioxide Monitors

................................................................. 20

Planned Changes in Sulfur Dioxide Monitoring for 2009/2010

...................................................... 20

METEOROLOGICAL MEASUREMENTS

............................................................................................. 21

Planned Changes in Meteorological Monitoring for 2009/2010

..................................................... 21

PARTICULATE MONITORING

............................................................................................................. 22

PM 10 

## Monitoring

................................................................................................................................ 22

Larimer and Weld Counties

........................................................................................................... 22

Metropolitan Denver Counties

....................................................................................................... 22

El Paso, Park & Teller Counties

.................................................................................................... 22

Western Counties

.......................................................................................................................... 23

Planned Changes in PM 10 

## Monitoring for 2009/2010

.................................................................... 23

PM 2.5 

## Monitoring

.............................................................................................................................. . 24

Larimer and Weld Counties

........................................................................................................... 24

Metropolitan Denver Counties

....................................................................................................... 24

El Paso, Park, Pueblo, Elbert & Teller Counties

............................................................................ 24

Western Counties

.......................................................................................................................... 25

PM 2.5 

## Sites not intended for NAAQS Comparison

......................................................................... 25

Planned Changes in PM 2.5 

## Monitoring for 2009/2010

.................................................................... 26

Total Suspended Particulates and Lead Monitoring

......................................................................... 26

Metropolitan Denver Counties

....................................................................................................... 26

New Lead NAAQS

......................................................................................................................... 27

Planned Changes in TSP and Lead Monitoring for 2009/2010

..................................................... 27

## Quality Assurance Accuracy Audits for Particulate Monitors

........................................................... 27

Quality Assurance Precision Checks for Particulate Monitors

......................................................... 29

Appendix A - Carbon Monoxide Site Descriptions

................................................................................ 30

Appendix B - Ozone Site Descriptions

.................................................................................................. 33

Appendix C - Nitrogen Dioxide Site Descriptions

................................................................................. 37

Appendix D - Sulfur Dioxide Site Descriptions

...................................................................................... 38

Appendix E - Meteorological Site Descriptions

..................................................................................... 39

Appendix F - PM 10 

## Site Descriptions

.................................................................................................... 42

Appendix G - PM 2.5 

## Site Descriptions

................................................................................................... 48

Appendix H - TSP/Lead Site Descriptions

............................................................................................ 52

Appendix I - National Core (NCore) Monitoring Station

........................................................................ 53



# Table of Tables

Table 1 - APCD Sites in Operation for 2009 - 2010

................................................................................ 3

Table 2 - Population Projections for 2005 - 2010

................................................................................. 10

Table 3 - Precision Checks for Carbon Monoxide in 2008

................................................................... 15

Table 4 - Accuracy Audits for Carbon Monoxide in 2008

..................................................................... 15

Table 5 - Precision Checks for Ozone in 2008

..................................................................................... 18

Table 6 - Accuracy Audits for Ozone in 2008

....................................................................................... 18

Table 7 - Precision Checks for Oxides of Nitrogen in 2008

.................................................................. 19

Table 8 - Accuracy Audits for Oxides of Nitrogen in 2008

.................................................................... 19

Table 9 - Precision Checks for Sulfur Dioxide in 2008

......................................................................... 20

Table 10 - Accuracy Audits for Sulfur Dioxide in 2008

......................................................................... 20

Table 12 - Accuracy Audits for Particulates in 2008

............................................................................. 28

Table 13 - Precision Checks for Particulates in 2008

........................................................................... 29

Table 14 - Parameters and Scale for the Denver Municipal Animal Shelter

......................................... 53

Table 15 - Traffic Information for the Denver Municipal Shelter

........................................................... 54

# INTRODUCTION

PURPOSE OF THE NETWORK PLAN

The purpose of the Network Plan is to provide an overview of the current Air Pollution Control

Division’s air quality monitoring network and projected plans for the coming year. This plan shows the

general reason for monitoring, the location of the monitor, and finally th e type and frequency of

measurements taken at each location. This is the thir d year that this review has been released to the

general public for comment prior to its submittal to th e U. S. Environmental Protection Agency (EPA) for

approval. This change was initiated because of a change in Federal Regul ations implemented in

December 2006.



# Overview

In 2009 the Colorado Air Pollution Control Divisi on (APCD) plans to operate monitors at 62

locations. In 2008 the APCD operated monitors at 59 separate locations. Particulate monitors including

Total Suspended Particulates (TSP), Partic ulate Matter 10 Microns and smaller (PM 10 

## ), Particulate Matter

2.5 Microns and smaller (PM 2.5 

## ) are the most abundant and widespr ead of monitoring types across the

state. Currently, there are PM 10 

## monitors at 30 separate locations and PM 2.5 

## monitors at 19 separate

locations. There are 23 meteorological sites in operation. These sites monitor wind speed, wind direction,

resultant speed, resultant direction, standard devi ation of horizontal wind direction and temperature.

Three meteorological sites also monitor for relative hum idity. Only 9 of the 62 locations will monitor for

3 or more parameters (w ith meteorological and PM 2.5 

## measurements counti ng as only one parameter

each). Only 3 locations monitored for more than 6 pa rameters, all of which are in the Denver Metro Area.

Increasing the amount of automated versus manual m onitoring will require modifications to the

particulate network since in the current network these are primarily manually operated monitors. The

APCD currently operates one TSP monitor that is used for lead analysis. Only 6 of the 30 PM 10 

## monitors

are continuous “hourly,” while 12 of the 19 PM 2.5 

## monitors are continuous. This difference reflects the

age of the technology more than anything else.

Thirty-seven of the 62 current monitoring sites ha ve been in operation for more than 10 years and

18 of these have been in operation for 20 or more y ears. Ten monitoring sites have been in operation for

more than 30 years. These sites are: Denver CAMP (44 years), Greeley-Hospital (42 years), Alamosa

Adams State College (39 years), Welby and Arvada (36 years), Pagosa Springs, Lamar Power Plant and

Steamboat Springs (34 years). Conversely, 24 of th e 62 monitoring sites have begun operation since the

start of the year 2000.



# APCD Monitoring Operations

The APCD attempts to operate all of its monito rs on an annual schedule. We attempt to begin

operation of new monitors in January and to term inate existing monitors in December. Circumstances

both in and out of our control make that desired schedule generally difficult to achieve. The primary

reason for this is that the Division does not own either the land or the buildings that most of our monitors

where most of the monitors are located.

When modifications to the network are required, the Division will provide EPA Region VIII with

the appropriate modification forms prior its implem entation for their approval. All currently operating

SLAMS monitors have been approved by EPA and ei ther meet the requirements set forth in Appendices

A, C, D and E or have received waivers.



# Network Modification Procedures

Colorado Air Monitoring Network Plan – 2009 –2010 

## 1 

## The APCD develops changes to its monitori ng network in several ways. New monitoring

locations have been added as the result of community concerns about air quality. An example of this

would be the PM 10 

## monitors that were established in Rifl e and Clifton. Other monitors have been

## established as a result of special studies. Examples of this would be the new ozone monitoring in Aurora,

Rifle, Cortez, Aspen Park, Rist Canyon, and Palisade. The Denver Firehouse #6 carbon monoxide

monitor was begun when models showed that it should have elevated carbon monoxide concentrations.

The most common reason for monitors being removed from the network is that either the

land/building is being modified, or the area surrounding the monitor is being modified in a way that

changes the monitoring location. The most cu rrent example of this is the Pueblo PM 10 

## monitor. It will

have to be moved this year because of the construc tion of a new multi story building on the next lot.

Monitors are also removed from the network after revi ew of the data shows that the levels have dropped

to the point where it is no longer reasonable to continue monitoring at that location. Examples of this are

the reduction of TSP lead monitoring around the state from six monitors to one. Another example of this

type of change is the termination of carbon m onoxide monitoring at the NJH-E location. The carbon

monoxide concentrations at that location have dropped to the point that the Division, with EPA’s

approval, felt that the monitor could be better used elsewhere in the system.

Finally, all monitors are reviewed on a regular basi s to determine if they are continuing to meet

their monitoring objectives. Has the population, la nd use or vegetation around the monitor changed

significantly since the monitor was established? If it has is there a “better” location for the monitor?

All changes to SLAMS monitoring are approved by EPA prior to the change being made. While

special purpose monitoring does not require EPA approva l, all efforts are made to follow siting criteria as

set forth in 40 CFR 58, Appendix D and Appendix E.

Colorado Air Monitoring Network Plan – 2009 –2010 

## 2 

## Table 1 lists the locations and monitoring parame ters of each site currently in operation, by

county alphabetically.

## Table 1 - APCD Sites in Operation for 2009 - 2010

Colorado Air Monitoring Network Plan – 2009 –2010 

## 3

AQS # Site Name Address Started Ended Latitude Longitude Elevation



# Adams

08 001 0006 Commerce City 7101 Birch St. 01/2001 39.826007 -104.937438 1,565



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 01/2001 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 2.5 1 01/2001 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 2.5 2 01/2001 P.O. Neigh Partisol 2025 SLAMS 1/6

PM 2.5 3 01/2001 P.O. Neigh TEOM-1400ab SPM Continuous

PM 2.5 5 01/2001 P.O. Neigh SASS Trends Spec 1/3

PM 2.5 Carbon 5 04/2009 P.O. Neigh URG 3000N Trends Spec 1/3

WS/WD/Temp 1 06/2003 Other Met - One Other Continuous

08 001 3001 Welby 3174 E. 78 th Ave. 07/1973 39.838119 -104.949840 1,554



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 07/1973 P.O. Neigh Thermo 48C SLAMS Continuous

SO 2 2 07/1973 P.O. Neigh API 100E SLAMS Continuous

NO 2 01/1976 P.O. Urban API 200E Other Continuous

NO 2 1 01/1976 P.O. Urban API 200E SLAMS Continuous

O 3 2 07/1973 P.O. Neigh API 400A SLAMS Continuous

WS/WD/Temp 1 01/1975 Other Met - One Other Continuous

PM 10 1 07/1990 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 10 3 06/1990 P.O. Neigh TEOM-1400ab SLAMS Continuous



# Alamosa

08 003 0001 Alamosa - ASU 208 Edgemont Blvd 01/1970 37.469391 -105.878691 2,302



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 06/1989 P.O. Neigh SA/GMW-1200 SLAMS 1/1

08 003 0003 Alamosa Municipal 425 4 th St. 04/2002 37.469584 -105.863175 2,301



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 04/2002 P.O. Neigh SA/GMW-1200 SLAMS 1/1



# Arapahoe

08 005 0002 Highland Reservoir 8100 S. University Blvd 06/1978 39.567887 -104.957193 1,747



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 06/1978 P.O. Neigh API 400A SLAMS Continuous

WS/WD/Temp 1 07/1978 Other Met - One Other Continuous

08 005 0005 Arapahoe Comm. Coll. 6190 S. Santa Fe Dr. 12/1998 39.604399 -105.01526 1,636



### Parameter POC Started Scale Monitor Type Sample

PM 2.5 1 03/1999 P.O. Neigh Partisol 2025 SLAMS 1/3

08 005 0006 Aurora - East 36001 W Quincy Ave. 04/2009 39.638540 -104.569130 1799



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 04/2009 SPM Region API 400E SPM Continuous

WS/WD/Temp + Other Met - One Other Continuous



# Archuleta

08 007 0001 Pagosa Springs 309 Lewis St. 08/1975 37.268420 -107.009659 2,165

Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 3 06/2001 P.O. Neigh SA/GMW-1200 SLAMS 1/1

## AQS # Site Name Address Started Ended Latitude Longitude Elevation

Colorado Air Monitoring Network Plan – 2009 –2010 

## 4 

# Boulder

08 013 0003 Longmont-Municipal 350 Kimbark St. 06/1985 40.164576 -105.100856 1520



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 2 04/1985 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 2.5 1 01/1999 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 2.5 3 01/1985 P.O. Neigh TEOM 1400ab SLAMS Continuous

08 013 0009 Longmont - Main 440 Main St. 11/1989 40.166586 -105.102402 1,519



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 11/1989 P.O. Micro Thermo 48C SLAMS Continuous

08 013 0011 Boulder - Foothills 1405 1⁄2 S. Foothills Parkway 06/1994 39.957159 -105.238513 1,669



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 06/1994 H.C. Urban API 400E SLAMS Continuous

08 013 0012 Boulder Chamber 2440 Pearl St. 12/1994 40.021097 -105.263382 1,619



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 12/1994 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 2.5 1 01/1999 P.O. Neigh Partisol 2025 SLAMS 1/3

08 013 1001 Boulder CU/Athens 2102 Athens St. 12/1980 40.012969 -105.264212 1,622



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 2.5 3 11/2004 P.O. Neigh TEOM FDMS SPM Continuous



# Delta

08 029 0004 Delta 560 Dodge St. 08/1993 38.739213 -108.073118 1,511



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 08/1993 P.O. Neigh SA/GMW-1200 SLAMS 1/3



# Denver

08 031 0002 Denver - CAMP 2105 Broadway 01/1965 39.751184 -104.987625 1,593



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 2 01/1971 P.O. Micro Thermo 48C SLAMS Continuous

SO 2 1 01/1967 P.O. Neigh API 100E SLAMS Continuous

NO 1 01/1973 Other API 200E Other Continuous

NO 2 1 01/1973 P.O. Neigh API 200E SLAMS Continuous

WS/WD/Temp 1 01/1965 Other Met - One Other Continuous

PM 10 1 01/1986 P.O. Micro SA/GMW-1200 SLAMS 1/6

PM 10 2 08/1986 P.O. Micro SA/GMW-1200 SLAMS 1/6

PM 10 3 01/1988 P.O. Micro TEOM-1400ab SLAMS Continuous

PM 2.5 1 01/1999 P.O. Micro Partisol 2025 SLAMS 1/1

PM 2.5 2 09/2001 P.O. Micro Partisol 2025 SLAMS 1/3

PM 2.5 3 01/1999 P.O. Micro TEOM FDMS SLAMS Continuous

08 031 0013 NJH-East 14 th Ave. & Albion St. 01/1983 39.738578 -104.939925 1,620



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 2.5 3 10/2003 P.O. Middle TEOM FDMS SPM Continuous

08 031 0014 Denver - Carriage 2325 Irving St. 06/1982 39.751761 -105.030681 1,621



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 2 01/1982 P.O. Neigh API 400E SLAMS Continuous

WS/WD/Temp 1 01/1983 Other Met - One Other Continuous

08 031 0017 Denver Visitor Center 225 W. Colfax Ave. 12/1992 39.740342 -104.991037 1,597



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 12/1992 P.O. Middle SA/GMW-1200 SLAMS 1/1

## AQS # Site Name Address Started Ended Latitude Longitude Elevation

Colorado Air Monitoring Network Plan – 2009 –2010 

## 5 08 031 0019 Denver Firehouse #6 1300 Blake St. 11/1993 39.748163 -105.002564 1,585



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 11/1993 P.O. Micro Thermo 48C SLAMS Continuous

08 031 0021 Auraria Campus Met 12 th St. and Auraria Parkway 03/1999 39.746955 -105.003604 1,586



### Parameter POC Started Orient/Scale Monitor Type Sample

WS/WD/Temp 1 03/1999 Other Met - One Other Continuous

Relative Humidity 1 03/1999 Other Rotronic Other Continuous

08 031 0023 Denver - Swansea 4650 Columbine St 07/2002 39.781083 -104.956650 1,583



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 2.5 1 12/2004 P.O. Neigh Partisol 2025 SPM 1/1

08 031 0025 Denver Municipal

Animal Shelter 678 S. Jason St. 07/2005 39.704005 -104.998113 1,594



### Parameter POC Started Orient/Scale Monitor Type Sample

CO (Trace) 1 04/2009 P.O. Neigh Thermo 48C-TLE NCore Continuous

SO 2 (Trace) 1 06/2009 P.O. Neigh Ecotech 9850T NCore Continuous

NO Y +

O 3 1 04/2008 Neigh/Urban API 400A NCore Continuous

WS/WD/Temp (U) 1 07/2008 P.O. Neigh Met - One NCore Continuous

Relative Humidity 1 + Rotronic NCore Continuous

Barometric Pressure 1 + NCore Continuous

Solar Radiation 1 + NCore Continuous

Precipitation 1 + NCore Continuous

Temp (L) 1 07/2008 P.O. Neigh Met - One NCore Continuous

TSP 1 07/2005 P.O. Neigh TSP SLAMS 1/6

TSP 2 07/2005 P.O. Neigh TSP SLAMS 1/6

Pb 1 07/2005 P.O. Neigh TSP SLAMS 1/6

Pb 2 07/2005 P.O. Neigh TSP SLAMS 1/6

PM 10 1 07/2005 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 10 2 07/2005 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 10 3 08/2005 P.O. Neigh TEOM-1400ab SLAMS Continuous

PM 2.5 1 10/2007 P.O. Neigh Partisol 2025 NCore 1/6

PM 2.5 3 10/2007 P.O. Neigh TEOM FDMS SPM Continuous



# Douglas

08 035 0004 Chatfield State Park 11500 N Roxborough Pk Rd 04/2004 39.534488 -105.070358 1,676



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 05/2005 H.C. Urban API 400E SLAMS Continuous

WS/WD/Temp 1 04/2004 Other Met - One Other Continuous

PM 2.5 1 07/2005 P.O. Neigh Partisol 2025 SPM 1/3

PM 2.5 3 05/2004 P.O. Neigh TEOM 2000 SPM Continuous



# Elbert

08 039 0001 Elbert County 24950 Ben Kelly Rd. 12/1998 39.231384 -104.634770 2,139



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 2.5 1 05/1999 Back Region Partisol 2025 SLAMS 1/6



# El Paso

08 041 0013 U. S. Air Force Academy USAFA Rd 640 05/1996 39.958341 -104.817215 1,971



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 06/1996 P.O. Urban ML 8810 SLAMS Continuous

08 041 0015 Colorado Springs Hwy-24 690 W. Hwy 24 11/1998 39.830895 -104.839243 1,824



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 11/1998 P.O. Micro Thermo 48C SLAMS Continuous

WS/WD/Temp + Other Met – One Other Continuous

## AQS # Site Name Address Started Ended Latitude Longitude Elevation

Colorado Air Monitoring Network Plan – 2009 –2010 

## 6 08 041 0016 Manitou Springs 101 Banks Pl. 04/2004 

### 38.853097 -104.901289 1,955

Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 04/2004 P.O. Neigh API 400E SLAMS Continuous

08 041 0017 Colorado College 130 W. Cache la Poudre 12/2007 38.848014 -104.828564 1,832



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 12/2007 P.O. Neigh Partisol 2000 SLAMS 1/6

PM 2.5 1 12/2007 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 2.5 3 01/2008 P.O. Neigh TEOM FDMS SPM Continuous



# Fremont

08 043 0003 Cañon City – City Hall 128 Main St. 10/2004 38.438290 -105.245040 1,626



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 10/2004 P.O. Neigh SA/GMW-1200 SLAMS 1/6



# Garfield

08 045 0005 Parachute 100 E. 2 n d St. 01/1982 38.453654 -108.053269 1,557



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 05/2000 P.O. Neigh SA/GMW-1200 SLAMS 1/3

08 045 0007 Rifle – Henry Bldg 144 3 r d St. 05/2005 39.531813 -107.782298 1,627



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 05/2005 P.O. Neigh SA/GMW-1200 SPM 1/3

PM 2.5 1 09/2008 P.O. Neigh TEOM 1405 SPM Continuous

PM 10 3 09/2008 P.O. Neigh TEOM 1405 SPM Continuous

PM Course 1 09/2008 P.O. Neigh TEOM 1405 SPM Continuous

WS/WD/Temp + Other Met - One Other Continuous

08 045 0012 Rifle - Health 195 W. 14 th Ave. 06/2008 39.541820 -107.784125 1,640



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 06/2008 SPM Neigh API 400E SPM Continuous



# Gunnison

08 051 0004 Crested Butte 603 6 th St. 09/1982 38.867595 -106.981436 2,714



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 2 03/1987 P.O. Neigh SA/GMW-1200 SLAMS 1/3

PM 10 3 10/2008 P.O. Neigh SA/GMW-1200 QA Collocated 1/6

08 051 0007 Mt. Crested Butte 19 Emmons Rd. 07/2005 38.900392 -106.966104 2,866



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 07/2005 P.O. Neigh SA/GMW-1200 SLAMS 1/1



# Jefferson

08 059 0002 Arvada 9101 W. 57 th Ave. 01/1973 39.800333 -105.099973 1,640



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 08/1973 P.O. Neigh API 400E SLAMS Continuous

WS/WD/temp 1 01/1975 Other Met - One Other Continuous

08 059 0005 Welch 12400 W. Hwy 285 08/1991 39.638781 -105.139480 1,742



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 08/1991 P.O. Urban API 400A SLAMS Continuous

WS/WD/temp 1 11/1991 Other Met - One Other Continuous

08 059 0006 Rocky Flats - N 16600 W. Hwy 128 06/1992 39.912899 -105.188587 1,802



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 09/1992 H.C. Urban API 400E SLAMS Continuous

WS/WD/temp 1 09/1992 Other Met - One Other Continuous

08 059 0008 Rocky Flats - SE 9901 Indiana St. 06/1992 39.876390 -105.165611 1,716



### Parameter POC Started Orient/Scale Monitor Type Sample

WS/WD/temp 1 08/1991 Other Met - One Other Continuous

## AQS # Site Name Address Started Ended Latitude Longitude Elevation

08 059 0011 NREL 2054 Quaker St. 06/1994 39.743724 -105.177989 1,832



### Parameter POC Started Scale Monitor Type Sample

O 3 1 06/1994 H.C. Urban API 400E SLAMS Continuous

08 059 0013 Aspen Park 26137 Conifer Rd. 04/2009 39.541515 -105.298410 2,473



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 04/2009 SPM Neigh API 400E SLAMS Continuous

WS/WD/Temp + Other Met - One Other Continuous



# La Plata

08 067 0004 Durango-RCH 1235 Camino del Rio 09/1985 37.277298 -107.880928 1,986



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 12/2002 P.O. Neigh API 400E SLAMS Continuous



# Larimer

08 069 0009 Fort Collins - CSU 251 Edison Dr 12/1998 40.571288 -105.079693 1,524



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 07/1999 P.O. Neigh SA/GMW-1200 SLAMS 1/3

PM 10 3 + P.O. Neigh Thermo 1405 DF SLAMS Continuous

PM 2.5 1 07/1999 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 2.5 3 + P.O. Neigh Thermo 1405 DF SPM Continuous

08 069 0011 Fort Collins - West 3416 La Porte Ave. 05/2006 40.592543 -105.141122 1,571



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 05/2006 H.C. Urban API 400E SLAMS Continuous

08 069 0012 Rist Canyon 11835 Rist Canyon Rd. 04/2009 40.642135 -105.275105 2,058



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 04/2009 SPM Urban API 400E SPM Continuous

WS/WD/Temp 1 04/2009 Other Met - One Other Continuous

Colorado Air Monitoring Network Plan – 2009 –2010 

## 7 08 069 1004 Fort Collins - Mason 708 S. Mason St. 12/1980 40.577470 -105.078920 1,524



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 12/1980 P.O. Neigh Thermo 48C SLAMS Continuous

O 3 1 12/1980 P.O. Neigh API 400E SLAMS Continuous

WS/WD/Temp 1 01/1981 Other Met - One Other Continuous



# Mesa

08 077 0017 Grand Junction - Powell 650 South Ave. 02/2002 39.063798 -108.561173 1,398



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 3 01/2005 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 10 4 03/2005 P.O. Neigh Partisol 2000 SPM 1/6

PM 2.5 1 11/2002 P.O. Neigh Partisol 2025 SLAMS 1/6

PM 2.5 3 01/2005 P.O. Neigh TEOM 1400ab SLAMS Continuous

PM 2.5 5 11/2002 P.O. Neigh SASS Supplemental Speciation 1/6

PM 2.5 Carbon 5 04/2009 P.O. Neigh URG 3000N Supplemental Speciation 1/6

08 077 0018 Grand Junction - Pitk in 645 1⁄4 Pitkin Ave. 01/2004 39.064289 -108.561550 1,398



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 01/2004 P.O. Neigh Met-One BAM SLAMS Continuous

CO 1 01/2004 P.O. Micro Thermo 48C SLAMS Continuous

WS/WD/Temp 1 01/2004 Other Met - One Other Continuous

Relative Humidity 1 01/2004 Other Rotronic Other Continuous

08 077 0019 Clifton Hwy 141 and D Rd. 10/2006 39.062514 -108.457382 1,413



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 10/2007 P.O. Neigh SA/GMW -1200 SLAMS 1/3

08 077 0020 Palisade Water Treatment Rapid Creek Rd. 04/2009 39.130575 -108.313835 1,421



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 04/2009 SPM Urban API 400E SLAMS Continuous

WS/WD/Temp + 04/2009 Other Met - One Other Continuous

## AQS # Site Name Address

Colorado Air Monitoring Network Plan – 2009 –2010 

## 8 Started Ended Latitude Longitude Elevation



# Montezuma

08 083 0006 Cortez 106 W. North St. 06/2006 37.349963 -108.587159 1,890



### Parameter POC Started Scale Monitor Type Sample

O 3 1 04/2009 SPM Urban API 400E SLAMS Continuous

WS/WD/Temp 1 04/2009 Other Met - One Other Continuous

PM 2.5 1 06/2008 SPM Region Patisol 2000 SPM 1/6



# Pitkin

08 097 0006 Aspen - Library 120 Mill St. 05/2002 39.191040 -106.818864 2,408



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 05/2002 P.O. Neigh SA/GWM 1200 SLAMS 1/3

PM 10 2 05/2002 P.O. Neigh SA/GWM 1200 SLAMS 1/3

PM 10 3 05/2002 P.O. Neigh TEOM-1400ab SLAMS Continuous



# Prowers

08 099 0001 Lamar Power Plant 100 N. 2 n d St. 08/1975 38.090949 -102.613912 1,107



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 2 03/1987 P.O. Neigh SA/GMW-1200 SLAMS 1/1

08 099 0002 Lamar Municipal 104 E. Parmenter St. 12/1976 38.084688 -102.618641 1,107



### Parameter POC Starte d Orient/Scale Moni tor Type Sample

PM 10 2 03/1987 P.O. Neigh SA/GMW-1200 SLAMS 1/1

08 099 0003 Lamar Port of Entry 7100 US Hwy 50. 03/2005 38.113792 -102.626181 1,108



### Parameter POC Started Orient/Scale Monitor Type Sample

WS/WD/Temp 1 03/2005 Other Met - One Other Continuous



# Pueblo

08 101 0012 Pueblo Public Works 211 D St. 07/1998 38.263058 -104.612133 1,421



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 07/1998 P.O. Neigh SA/GMW-1200 SLAMS 1/1

PM 2.5 1 02/1999 P.O. Neigh Partisol 2025 SLAMS 1/3



# Routt

08 107 0003 Steamboat Springs 136 6 th St. 09/1975 40.485201 -106.831625 2,054



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 2 03/1987 P.O. Neigh SA/GMW-1200 SLAMS 1/1



# San Miguel

08 113 0004 Telluride 333 W. Colorado Ave. 03/1990 37.937872 -107.813061 2,684



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 03/1990 P.O. Neigh SA/GMW-1200 SLAMS 1/3



# Summit

08 117 0002 Breckenridge 501 N. Park Ave. 04/1992 39.491461 --106.047325 2,904



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 1 04/1992 P.O. Neigh SA/GMW-1200 SLAMS 1/3



# Weld

08 123 0006 Greeley-Hospital 1516 Hospital Rd. 04/1967 40.414877 -104.706930 1,441



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 10 2 03/1987 P.O. Neigh SA/GMW-1200 SLAMS 1/3

PM 2.5 1 02/1999 P.O. Neigh Partisol 2025 SLAMS 1/3

PM 2.5 3 02/1999 P.O. Neigh TEOM - 1400ab SPM ContinuousColorado Air Monitoring Network Plan – 2009 –2010 

## 9 AQS # Site Name Address Started Ended Latitude Longitude Elevation

08 123 0008 Platteville 1004 Main St 12/1998 40.209387 -104.824050 1,469



### Parameter POC Started Orient/Scale Monitor Type Sample

PM 2.5 1 08/1999 P.O. Region Partisol 2025 SLAMS 1/3

PM 2.5 5 08/1999 P.O. Region SASS Supplemental Speciation 1/6

PM 2.5 Carbon 5 04/2009 P.O. Neigh URG 3000N Supplemental Speciation 1/6

08 123 0009 Greeley -Tower 3101 35 th Ave. 06/2002 40.386368 -104.737440 1,484



### Parameter POC Started Orient/Scale Monitor Type Sample

O 3 1 06/2002 P.O. Neigh API 400E SLAMS Continuous

WS/WD/Temp 1 + Other Met - One Other Continuous

08 123 0010 Greeley – West Annex 905 10 th Ave. 12/2003 40.423432 -104.694790 1,421



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 12/2003 P.O. Neigh Thermo 48C SLAMS Continuous



## The following abbreviations were used in Table 1, with orientation (Orient) referring to the reason why

the monitor was placed in that location, and scale refe rring to the size of the area that concentrations from

the monitor represent.

Orientation Scale

P.O. - Population oriented Micro - Micro-scale

Back - Background orientation Neigh - Neighborhood Scale

SPM - Special Projects Monitor Middle - Middle Scale

H.C. - Highest Concentration Urban - Urban Scale

Parm - Parameter Code Regional - Regional Scale

Also included in the above table are listings as “Oth er” which are meteorological monitors that do not

include either orientation or scale. The “+” in the “S tart” column indicates that the monitor has not been

installed. .Colorado Air Monitoring Network P10lan – 2009 - 2010Table 2 - Population Projections for 2005 - 2010REGIONS/CountiesProjected PopulationAnnual ChangeCOSO2NOXNOYO3MetR.H.PrecipTSPPbPM10PM10HPM2.5PM2.5HJuly, 2005July, 201000-0505-10COLORADO4,718,5625,207,8011.7%2.0%93321233112761612FRONT RANGE3,862,6334,250,3321.8%1.9%733161521194119DNVR-BLDR REGION2,623,8712,845,1751.6%1.6%DENVER PMSA2,337,9912,546,3532.0%1.7%Adams402,110452,4111.9%2.4%08 001 0006 Commerce City111/C/S108 001 3001 Welby1111111Arapahoe534,252581,8971.7%1.7%08 005 0002 Highland Reservoir1108 005 0005 Arapahoe Community College108 005 0006 Aurora Reservoir++Broomfield45,75551,970---2.6%Denver571,848606,6670.6%1.2%08 031 0002 Denver CAMP11111/C11/C108 031 0013 Denver NJH108 031 0014 Denver Carriage1108 031 0017 Denver Visitor Center108 031 0019 Denver Firehouse #6108 031 0021 Auraria Met1108 031 0023 Swansea108 031 0025 Denver Animal Shelter11+111+1/C1/C1/C111Douglas251,418303,3626.8%3.8%08 035 0004 Chatfield Reservoir11Jefferson532,608550,0460.2%0.6%08 059 0002 Arvada1108 059 0005 Welch1108 059 0006 Rocky Flats - N1108 059 0008 Rocky Flats - SE108 059 0011 NREL108 059 0013 Aspen Park++BOULDER PMSA/Co285,880298,822-0.7%0.9%BOULDER PMSA/Co08 013 0003 Longmont Municipal11108 013 0009 Longmont - Main108 013 0011 Boulder - Foothills108 013 0012 Boulder Chamber11Colorado Air Monitoring Network Plan – 2009 - 201011REGIONS/CountiesProjected Population Annual ChangeCOSO2NOXNOYO3MetR.H.PrecipTSPPb PM10PM10HPM2.5PM2.5HJuly, 2005 July, 2010 00-05 05-1008 013-1001 Boulder CU/Athens1NORTH FRONT RANGE499,962566,0722.7%2.5%FORT COLLINS MSA271,951299,0401.4%1.9%08 069 0009 Fort Collins - CSU11108 069 0011 Fort Collins - West108 069 0012 –Rist Canyon++08 069 1004 Fort Collins - Mason111GREELEY MSA228,011267,0324.4%3.2%08 123 0006 Greeley Hospital11108 123 0008 Platteville1/C08 123 0009 Greeley - Tower1+08 123 0010 Greeley - West Annex1COLO. SPRINGS MSA587,696674,1031.6%2.8%El Paso565,350649,2171.7%2.8%08 041 0013 USAFA108 041 0015 Colorado Springs - Hwy-241+08 041 0016 Manitou Springs108 041 0018 Colorado College111Teller22,34624,8861.1%2.2%PUEBLO MSA151,104164,9821.2%1.8%08 101 0012 Pueblo Public Works11WESTERN SLOPE513,332589,8361.9%2.8%REGION 987,01997,6201.5%2.3%Archuleta11,71614,1313.2%3.8%08 007 0001 Pagosa Springs1Dolores1,8462,0760.0%2.4%La Plata48,01953,2821.5%2.1%08 067 0004 Durango - RCH1Montezuma24,86227,5230.8%2.1%08 083 0006 Cortez11San Juan5766080.6%1.1%REGION 1094,835107,2871.8%2.5%Delta30,25734,2001.6%2.5%08 029 0004 Delta1Gunnison14,26415,2330.4%1.3%08 051 0004 Crested Butte1/C08 051 0007 Mt. Crested Butte1Hinsdale8219180.8%2.3%Montrose37,88043,8752.4%3.0%Colorado Air Mol 201012nitoring Network Pan – 2009 -REGIONS/CountiesProjected PopulationAnnual ChangeCOSO2NOXNOYO3MetR.H.PrecipTSPPbPM10PM10HPM2.5PM2.5HJuly, 2005July, 201000-0505-10Ouray4,3034,7812.7%2.1%San Miguel7,3108,2801.9%2.5%08 113 0004 Telluride1REGION 11222,739260,3042.1%3.2%Garfield50,67364,0972.7%4.8%08 045 0005 Parachute108 045 0007 Rifle - Henry Building1108 045 0012 Rifle - Health1Mesa130,662150,5042.1%2.9%08 077 0017 Grand Junction - Powell1/C1/C108 077 0018 Grand Junction - Pitkin1111108 077 0019 Clifton108 077 0020 Palisade Water Treatment11Moffat13,42614,4240.4%1.4%Rio Blanco6,0736,6510.3%1.8%Routt21,90524,6281.7%2.4%08 107 0003 Steamboat Springs1REGION 12108,739124,6251.8%2.8%Eagle49,37558,1962.6%3.3%Grand13,90615,9201.5%2.7%Jackson1,5311,584-0.6%0.7%Pitkin16,42017,4270.6%1.2%08 097 0006 Aspen - Library1/C1Summit27,50731,4981.3%2.7%08 117 0002 Breckenridge1CENTRAL MTNS.131,841145,2350.9%2.0%CLR CRK. & GILPIN14,51415,7370.5%1.6%Clear Creek9,51010,2420.3%1.5%Gilpin5,0045,4950.9%1.9%Park16,59519,6162.5%3.4%REGION 1376,52983,2840.6%1.7%Chaffee16,88917,9410.7%1.2%Custer3,9644,5992.3%3.0%Fremont47,72751,4540.5%1.5%08 043 0003 Cañon City - City Hall1Lake7,9499,2900.1%3.2%REGION 1424,20326,5980.9%1.9%Huerfano7,9328,7710.2%2.0%Las Animas16,27117,8271.3%1.8%Colorado Air Monitoring Network Plan – 2009 - 201013REGIONS/CountiesProjected PopulationAnnual ChangeCOSO2NOXNOYO3MetR.H.PrecipTSPPbPM10PM10HPM2.5PM2.5HJuly, 2005July, 201000-0505-10SAN LUIS VALLEY48,50650,6080.9%0.9%Alamosa15,76516,6920.8%1.1%08 003 0001 Alamosa - ASC108 003 0003 Alamosa - Municipal1Conejos8,5868,8810.4%0.7%Costilla3,6283,767-0.2%0.8%Mineral9461,0292.6%1.7%Rio Grande13,04313,2631.0%0.3%Saguache6,5386,9761.9%1.3%EASTERN PLAINS162,250171,7900.4%1.1%REGION 172,16577,3540.6%1.4%Logan21,60523,3270.7%1.5%Morgan28,34831,2410.8%2.0%Phillips4,6314,7450.7%0.5%Sedgwick2,6672,705-0.6%0.3%Washington4,9364,9900.1%0.2%Yuma9,97810,3460.2%0.7%REGION 538,69341,8841.1%1.6%Cheyenne2,1202,068-1.0%-0.5%Elbert22,78625,8482.4%2.6%08 035 0001 Elbert County1Kit Carson7,8828,002-0.3%0.3%Lincoln5,9055,966-0.9%0.2%REGION 651,39252,552-0.4%0.4%Baca4,2634,128-1.1%-0.6%Bent6,3146,4321.1%0.4%Crowley5,7406,2350.8%1.7%Kiowa1,5331,501-1.1%-0.4%Otero19,56919,971-0.7%0.4%Prowers13,97314,285-0.6%0.4%08 099 0001 Lamar Power Plant108 099 0002 Lamar - Municipal108 099 0003 Lamar Port of Entry1+ - indicates monitors that will be installed in 2009.C- Collocated monitorsS- SASS PM10monitor

# CARBON MONOXIDE

In 2009 as in 2008 the APCD will operate nine carbon monoxide monitors. The levels have

declined from a statewide maximum 8- hour value of 48.1 ppm in 1973 to a value of 3.1 ppm in 2008. The

level of the standard has not been exceeded sin ce 1999. The carbon monoxide monitors currently operated

by the APCD are associated with State Implementation Plan requirements.



# Larimer and Weld Counties

Larimer and Weld counties have a population of 532,759 (July 2007 population estimates), an

increase of 23.2 percent since the 2000 Census. The tw o major urban centers are Fort Collins in Larimer

County and Greeley in Weld County. Larimer County h as irrigated farmland in the eastern half while the

western half is mountainous. Weld County is pr edominantly grassland and irrigated farmland. Motor

vehicle activity is a major source of pollutants. However, there are several small industries and

manufacturing processes located within the two counties. These industries include a brewery, power

plants, cement plants, mining, electronics and film manufacturing facilities and rock quarries.

The carbon monoxide monitors in this area are:

08 069-1004 Fort Collins, 708 S. Mason Street

08 123 0010 Greeley -West Annex, 905 10 th 

## Avenue



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. Carbon monoxide

monitoring is conducted only in the Denver metropolitan area. This consists of all of Denver County, the

western half of Adams and Arapahoe counties, mo st of Boulder and Jefferson counties, the northern

portion of Douglas County and none of Clear Creek and Gilpin counties.

The carbon monoxide monitors in this area are:

08 001 3001 Welby, 3174 E. 78 th 

## Avenue

08 013 0009 Longmont -Main, 440 Main Street

08 031 0002 Denver CAMP, 2105 Broadway

08 031 0019 Denver Firehouse #6, 1300 Blake Street

08 031 0025 Denver Municipal Anim al Shelter, 678 S. Jason Street



# El Paso, Park & Teller Counties

This area has a population of 617,864 according to the July 2007 population estimate this is an

increase of 12.0 percent from the 2000 census. It is a very popular tourist area with rapid urban growth.

The land usage varies from open prairies in eastern El Paso County to very mountainous in Teller and

Park Counties. Only El Paso County has a large urba nized area, Colorado Springs, with a population of

394,177 according to the July 2007 estimate. This is an increase of 9.2 percent since the 2000 census. The

City of Colorado Springs and El Paso County both ope rate separate monitoring networks that are not

included as a part of this report.

The carbon monoxide monitors in this area are:

08 041 0015 Colorado Springs - Hwy-24, 690 W. Highway 24



# Western Counties

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 14 

## The Western Slope consists of the 21 counties w est of the Continental Divide. The population of

the area is 579,813 (July 2007 popul ation estimate). This is an increase of 14.4 percent over the 2000

census. However, the population is not evenly distributed among the counties and ranges from Mesa

## County with 140,416 to San Juan Count y with only 571 according to the July 2007 estimate. Short-term

special purpose monitoring for carbon monoxide has been done in Summit County at Vail and near the oil

shale projects of Rio Blanco County. Grand Junction is the largest city on the western slope with a

population of 53,662 (July 2007 estimate). This is an increase of 27.8 percent from the 2000 census.

The carbon monoxide monitors in this area are:

08 077 0018 Grand Junction-Pitkin, 6451⁄4 Pitkin Avenue



# Quality Assurance Checks for Carbon Monoxide Monitors

The APCD staff performs two types of gaseous analyzer performance audits, assessment audits

and accuracy audits. These audits challenge the anal yzer with pollutant gases of known concentration

within the range of the analyzer. The following tabl e shows the number of these audits conducted on the

carbon monoxide analyzers for 2008.

The APCD Quality Assurance staff conducts aud its on all of the carbon monoxide instruments at

least twice per year. The APCD Field staff conducts precision checks nominally once every two weeks.

The details and minimum standards for this program ar e set out in the Code of Federal Regulations (Part

58 Ambient Air Quality Surveillance). A complete description of the procedures and the results are

available from the APCD.

Table 3 - Precision Checks for Carbon Monoxide in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

Welby 6 7 7 7

Longmont 6 7 6 6

CAMP 6 8 8 7

Firehouse 6 8 6 6

Highway 24 7 7 7 7

Ft Collins 6 7 6 6

Grand Junction 7 6 7 7

Greeley - Annex 6 7 6 6



## Table 4 - Accuracy Audits for Carbon Monoxide in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

Welby 1 1

Longmont 1 1

CAMP 1 1

Firehouse 1 1

Highway 24 1 1 1

Ft Collins 1 1

Grand Junction 1 1

Greeley - Annex 1 1 1



# Planned Changes in Carbon Monoxide Monitoring for 2009

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 15 

## None

# OZONE

On March 12, 2008, the U.S. Environmental Protection Agency released the new level of the

National ambient ozone standard. The change in the level was from 0.08 ppm as an 8-hour average to

0.075 ppm. This made a significant change in the nu mber of ozone monitors that exceed the 3-year

average 8-hour concentration standard. The following locations have exceeded the new level: Highland

Reservoir, Boulder - Foothills, Chatfield Reservoir, Arvada, Rocky Flats, NREL Solar Radiation

Research, Welch Fort Collins-West and Greeley - To wer. The following monitors are listed as marginal

as they are close to exceeding the level of the standa rd but have not exceeded the standard in the past

three years: Fort Collins, Denver Carriage, USAF Academy and Manitou Springs. The only monitors

operated by the CDPHE that are not close to exceed ing the level of the new standard are the Denver

CAMP and Welby locations.

The non-CDPHE monitor in Colorado that has 3-y ear average concentrations greater than the

new standard is at Rocky Mountain National Park. The ozone monitors operated at Mesa Verde National

Park and the Shamrock Mine site located northeast of Bayfield, Colorado are listed as marginal for being

near to the level of the standard.



# Larimer and Weld Counties

Larimer and Weld counties have a population of 532,759 (July 2007 population estimates), an

increase of 23.2 percent since the 2000 Census. The tw o major urban centers are Fort Collins in Larimer

County and Greeley in Weld County. Larimer County h as irrigated farmland in the eastern half while the

western half is mountainous. Weld County is pr edominantly grassland and irrigated farmland. Motor

vehicle activity is a major source of pollutants. However, there are several small industries and

manufacturing processes located within the two counties. These industries include a brewery, power

plants, cement plants, mining, electronics and film manufacturing facilities and rock quarries.

The ozone monitors in this area are:

08 069 0011 Fort Collins-West, 3416 LaPorte Ave.

08 069 0012 Rist Canyon, 11838 Rist Canyon Road

08 069 1004 Fort Collins-Mason, 708 S. Mason Street

08 123 0009 Greeley-Tower, 3101 35 th 

## Avenue



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. The Denver metropolitan

area consists of all of Denver County, the western ha lf of Adams and Arapahoe counties, most of Boulder

and Jefferson counties, the northern portion of Do uglas County and none of Clear Creek and Gilpin

counties. Only Adams, Arapahoe, Boulder, Douglas, Jefferson and Denver Counties have ozone monitors.

The ozone monitors in this area are:

08 001 3001 Welby, 3174 E. 78 th 

## Avenue

08 005 0002 Highland Reservoir, 8100 S. University Boulevard

08 005 0006 Aurora-East, 36001 Quincy Avenue

08 031 0011 Boulder-Foothills, 1405 1⁄2 S. Foothills Parkway

08 031 0014 Denver-Carriage, 2325 Irving Street

08 031 0025 Denver Municipal Anim al Shelter, 678 S. Jason Street

08 035 0004 Chatfield State Park, 11500 N. Roxborough Park Road

08 059 0002 Arvada, 9101 W. 57 th 

## Avenue

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 16 

## 08 059 0005 Welch, 12400 W. Hwy 285

## 08 059 0006 Rocky Flats-N, 16600 W. Hwy 128

08 059 0011 NREL, 2054 Quaker Street

08 059 0013 Aspen Park, 26137 Conifer Road



# El Paso, Park & Teller Counties

This area has a population of 617,864 according to the July 2007 population estimate this is an

increase of 12.0 percent from the 2000 census. It is a very popular tourist area with rapid urban growth.

The land usage varies from open prairies in eastern El Paso County to very mountainous in Teller and

Park Counties. Only El Paso County has a large urba nized area, Colorado Springs, with a population of

394,177 according to the July 2007 estimate. This is an increase of 9.2 percent since the 2000 census. In

addition, the City of Colorado Springs and El Paso County both operate separate monitoring networks

that are not included as a part of this report.

The ozone monitors in this area are:

08 041 0013 U. S. Air Force Academy, USAFA Road 640

08 041 0016 Manitou Springs, 101 Banks Place



# Western Counties

The Western Slope consists of the 21 counties w est of the Continental Divide. The population of

the area is 579,813 (July 2007 popul ation estimate). This is an increase if 14.4 percent over the 2000

census. However, the population is not evenly distributed among the counties and ranges from Mesa

County with 140,416 to San Juan Count y with only 571 according to the July 2007 estimate. Short-term

special purpose monitoring for ozone has been done in Summit County at Vail and near the oil shale

projects of Rio Blanco County. Grand Junction is the largest city on the western slope with a population

of 53,662 (July 2007 estimate). This is an increase of 27.8 percent from the 2000 census.

The ozone monitors in this area are:

08 045 0012 Rifle-Health, 195 W. 14 th 

## Avenue

08 077 0020 Palisade Water Treatment, Hwy 141 and D Road

08 083 0006 Cortez, 106 W. North Street



# Quality Assurance Checks for Ozone Monitors

The APCD staff performs two types of gaseous analyzer performance audits, assessment audits

and accuracy audits. These audits challenge the anal yzer with pollutant gases of known concentration

within the range of the analyzer. The following tabl e shows the number of these audits conducted on the

ozone analyzers for 2008.

The APCD Quality Assurance staff conducts audits on all of the ozone instruments at least twice

per year. The APCD Field staff conducts precision ch ecks nominally once every two weeks. The details

and minimum standards for this program are set out in the Code of Federal Regulations (Part 58 Ambient

Air Quality Surveillance). A complete description of the procedures and the results are available from the

APCD.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 17

## Table 5 - Precision Checks for Ozone in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

Welby 6 7 7 7

Highlands 7 1

Boulder - Foothills 6 7 6 6

CAMP 1

Carriage 6 7 6 6

Denver Animal Shelter 4 7 7

Chatfield 6 6 6 6

A ir Force Academy 7 6 7 7

Manitou 7 7 7 7

A rvada 6 6 6 6

Welch 8 7 7 7

Rocky Flats - N. 6 6 6 6

NREL 6 6 8 6

Ft. Collins - West 7 6 6 6

Ft. Collins - Mason 6 6 6 6

Greeley - Tower 6 8 6 6



## Table 6 - Accuracy Audits for Ozone in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

Welby 1 1

Highlands 1

Boulder - Foothills 1 1

CAMP 1

Carriage 1 1

Chatfield 1 1

Air Force Academy 1 1 1

Manitou 1 1 1

Arvada 1 1

Welch 1 1

Rocky Flats - N. 1 1 1

NREL 1

Ft. Collins - West 1 1

Ft. Collins - Mason 1 1

Greeley - Tower 1 1



# Planned Changes in Ozone Monitoring for 2009/2010

1) Possible installation of additional monitors in western Colorado in 2010 to address oil and

gas development concerns.

2) Review of monitoring sites in North Front Range for possible enhancement.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 18 

## 3) Possible installation of new site in the Pueblo area in 2010 to meet possible new Federal

monitoring requirements.

# NITROGEN DIOXIDE

The Air Pollution Control Division has monitored nitrogen dioxide at eight locations in Colorado.

All but two of these locations are no longer operating. Only the CAMP monitor h as ever approached the

standard of 0.053 ppm. It recorded 0.052 in 1975, 1976 1979 and in 1983. In the past 20 years the levels

have been declining and in the past three years the le vels have been reduced to nearly one half of the

standard.



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. The Denver metropolitan

area consists of all of Denver County, the western ha lf of Adams and Arapahoe counties, most of Boulder

and Jefferson counties, the northern portion of Do uglas County and none of Clear Creek and Gilpin

counties.

The nitrogen dioxide monitors in this area are:

08 001 3001 Welby, 3174 E. 78 th 

## Avenue

08 031 0002 Denver-CAMP, 2105 Broadway



# Quality Assurance Checks for Oxides of Nitrogen Monitors

The APCD staff performs two types of gaseous analyzer performance audits, assessment audits

and accuracy audits. These audits challenge the anal yzer with pollutant gases of known concentration

within the range of the analyzer. The following tabl e shows the number of these audits conducted on the

oxides of nitrogen analyzers for 2007.

The APCD Quality Assurance staff conducts audits on all of the oxides of nitrogen instruments at

least twice per year. The APCD Field staff conducts precision checks nominally once every two weeks.

The details and minimum standards for this program ar e set out in the Code of Federal Regulations (Part

58 Ambient Air Quality Surveillance). A complete description of the procedures and the results are

available from the APCD.

Table 7 - Precision Checks for Oxides of Nitrogen in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

CAMP 3 6 4 3

Welby 5 7 7 7



## Table 8 - Accuracy Audits for Oxides of Nitrogen in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

CAMP 1 1

Welby 1 1



# Planned Changes in Nitrogen Dioxide Monitoring for 2009/2010

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 19 

## 1) Addition of NO Y 

## analyzer at the Denver Municipal Animal Shelter to meet NCore

requirements.

# SULFUR DIOXIDE

The Air Pollution Control Division has monitored sulfur dioxide at eight locations in Colorado.

All but two of these locations are no longer operating. Sulfur dioxide has never approached the level of

any of the sulfur dioxide standards even in the mid- 1970’s, when the levels were at their highest; they

were generally less than one half of the level of the standard. The primary reason for these low levels is

that what coal fired industry there is in Colorado us es low sulfur coal for combustion. In 2009 a new

trace/precursor-level sulfur dioxide monitor will be established as a part of the NCore monitoring at the

Denver Animal Shelter.



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. The Denver metropolitan

area consists of all of Denver County, the western ha lf of Adams and Arapahoe counties, most of Boulder

and Jefferson counties, the northern portion of Do uglas County and none of Clear Creek and Gilpin

counties.

The sulfur dioxide monitors in this area are:

08 001 3001 Welby, 3174 E. 78 th 

## Avenue

08 031 0002 Denver-CAMP, 2105 Broadway

08 031 0025 Denver Municipal Anim al Shelter, 678 S. Jason Street



# Quality Assurance Checks for Sulfur Dioxide Monitors

The APCD staff performs two types of gaseous analyzer performance audits, assessment audits

and accuracy audits. These audits challenge the anal yzer with pollutant gases of known concentration

within the range of the analyzer. The following tabl e shows the number of these audits conducted on the

sulfur dioxide analyzers for 2008.

The APCD Quality Assurance staff conducts audits on all of the sulfur dioxide instruments at

least twice per year. The APCD Field staff conducts precision checks nominally once every two weeks.

The details and minimum standards for this program ar e set out in the Code of Federal Regulations (Part

58 Ambient Air Quality Surveillance). A complete description of the procedures and the results are

available from the APCD.

Table 9 - Precision Checks for Sulfur Dioxide in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

CAMP 6 6 8 7

Welby 6 7 7 7



## Table 10 - Accuracy Audits for Sulfur Dioxide in 2008

Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

CAMP 1 1

Welby 1 1



# Planned Changes in Sulfur Di oxide Monitoring for 2009/2010

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 20 

## 1) None

# METEOROLOGICAL MEASUREMENTS

Meteorological measurements taken by the APCD consist of Wind Speed, Wind Direction,

Temperature and Humidity. The wind speed and direction measurements are made as both scalar and

vector averages. The last measurement that is made at the meteorological sites is the standard deviation of

horizontal wind direction. This is a calculation, not a direct measurement of the variation of wind

direction over time.

The meteorological monitors are:

08 001 0006 Commerce City, 7101 Birch Street

08 001 3001 Welby, 3174 E. 78 th 

## Avenue

08 005 0002 Highland Reservoir, 8100 S. University Boulevard

08 005 0006 Aurora-East, 36001 Quincy Avenue

08 031 0002 Denver-CAMP, 2105 Broadway

08 031 0014 Denver-Carriage, 2325 Irving Street

08 031 0021 Auraria Campus Met, 12 th 

## and Auraria Parkway

08 031 0025 Denver Municipal Anim al Shelter, 678 S. Jason Street

08 035 0004 Chatfield State Park, 11500 N. Roxborough Park Road

08 059 0002 Arvada, 9101 W. 57 th 

## Avenue

08 059 0005 Welch, 12400 W. Hwy 285

08 059 0006 Rocky Flats-N, 16600 W. Hwy 128

08 059 0008 Rocky Flats-SE, 9901 Indiana Street

08 059 0013 Aspen Park, 26137 Conifer Road

08 069 0012 Rist Canyon, 11838 Rist Canyon Road

08 069 1004 Fort Collins-Mason, 708 S. Mason Street

08 077 0018 Grand Junction-Pitkin, 645 1⁄4 Pitkin Avenue

08 077 0020 Palisade Water Treatment, Hwy 141 and D Road

08 099 0003 Lamar Port of Entry, 7100 US Hwy 50



# Planned Changes in Meteorolog ical Monitoring for 2009/2010

1) Elimination of the Rocky Flats SE site at the end of 2009.

2) Installation of sensors at the Greeley-Weld County Tower site.

3) Installation of sensors at the Colorado Springs - Hwy 24 site.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 21 

## 4) Installation of additional sensors at th e Denver Municipal Animal Shelter site.

# PARTICULATE MONITORING

PM 10 

# Monitoring

Larimer and Weld Counties

Larimer and Weld counties have a population of 532,759 (July 2007 population estimates), an

increase of 23.2 percent since the 2000 Census. The tw o major urban centers are Fort Collins in Larimer

County and Greeley in Weld County. Larimer County h as irrigated farmland in the eastern half while the

western half is mountainous. Weld County is pr edominantly grassland and irrigated farmland. Motor

vehicle activity is a major source of pollutants. However, there are several small industries and

manufacturing processes located within the two counties. These industries include a brewery, power

plants, cement plants, mining, electronics and film manufacturing facilities and rock quarries.

The PM 10 

## monitors in this area are:

08 069 0009 Fort Collins-CSU, 251 Edison Drive

08 123 0006 Greeley-Hospital, 1516 Hospital Road



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. The Denver metropolitan

area consists of all of Denver County, the western ha lf of Adams and Arapahoe counties, most of Boulder

and Jefferson counties, the northern portion of Do uglas County and none of Clear Creek and Gilpin

counties.

The PM 10 

## monitors in this area are:

08 001 0006 Commerce City, 7101 Birch Street

08 001 3001 Welby, 3174 E. 78 th 

## Avenue

08 013 0003 Longmont-Municipal, 350 Kimbark Street

08 013 0012 Boulder Chamber Building, 2440 Pearl Street

08 031 0002 Denver CAMP, 2105 Broadway

08 031 0017 Denver Visitor Center, 225 W. Colfax Avenue

08 031 0025 Denver Municipal Anim al Shelter, 678 S. Jason Street



# El Paso, Park & Teller Counties

This area has a population of 617,864 according to the July 2007 population estimate this is an

increase of 12.0 percent from the 2000 census. It is a very popular tourist area with rapid urban growth.

The land usage varies from prairie in eastern El Paso County to very mountainous in Teller and Park

Counties. Only El Paso County has a large urbani zed area, Colorado Springs, with a population of

394,177 according to the July 2007 estimate. This is an increase of 9.2 percent since the 2000 census. The

City of Colorado Springs and El Paso County both ope rate separate monitoring networks that are not

included as a part of this report.

The PM 10 

## monitors in this area are:

08 041 0017 Colorado College, 130 W. Cache la Poudre Street

08 043 0003 Cañon City-City Hall, 128 Main Street

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 22

# Western Counties

The Western Slope consists of the 21 counties w est of the Continental Divide. The population of

the area is 579,813 (July 2007 popul ation estimate). This is an increase if 14.4 percent over the 2000

census. However, the population is not evenly distributed among the counties and ranges from Mesa

County with 140,416 to San Juan County with only 571 according to the July 2007 estimate Grand

Junction is the largest city on the western slope with a population of 53,662 (July 2007 estimate). This is

an increase of 27.8 percent from the 2000 census.

The PM 10 

## monitors in this area are:

08 003 0001 Alamosa-Adams State College, 208 Edgemont Boulevard

08 003 0002 Alamosa Municipal, 425 4 th 

## Street

08 007 0001 Pagosa Springs, 309 Lewis Street

08 029 0004 Delta, 560 Dodge Street

08 045 0005 Parachute, 100 E. 2 nd 

## Street

08 045 0007 Rifle-Henry Building, 144 3 rd 

## Street

08 051 0004 Crested Butte, 603 6 th 

## Street

08 051 0007 Mount Crested Butte, 19 Emmons Road

08 067 0004 Durango-River City Hall, 1235 Camino del Rio

08 077 0017 Grand Junction-Powell, 650 South Avenue

08 077 0018 Grand Junction, 6451⁄4 Pitkin Avenue

08 077 0019 Clifton, Hwy 141 and D Road

08 097 0006 Aspen-Libr ary, 120 Mill Street

08 099 0001 Lamar Power Plant, 100 N. 2 nd 

## St.

08 099 0002 Lamar Municipal, 104 E. Parmenter Street

08 101 0012 Pueblo Public Works, 211 D St.

08 107 0003 Steamboat Springs, 136 6 th 

## Street

08 113 0004 Telluride, 333 W. Colorado Avenue

08 117 0002 Breckenridge, 501 N. Park Avenue



# Planned Changes in PM 10 

# Monitoring for 2009/2010

1) The Lamar Power Plant monitor will be consider ed for removal and replacement in 2009 due

to conversion of the plant to coal burning.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 23 

## 2) The Pueblo site will be relocated in 2009 due to the construction of a tall building next to the

current building.

# PM 2.5 

# Monitoring

Larimer and Weld Counties

Larimer and Weld counties have a population of 532,759 (July 2007 population estimates), an

increase of 23.2 percent since the 2000 Census. The tw o major urban centers are Fort Collins in Larimer

County and Greeley in Weld County. Larimer County h as irrigated farmland in the eastern half while the

western half is mountainous. Weld County is pr edominantly grassland and irrigated farmland. Motor

vehicle activity is a major source of pollutants. However, there are several small industries and

manufacturing processes located within the two counties. These industries include a brewery, power

plants, cement plants, mining, electronics and film manufacturing facilities and rock quarries. The

following PM 2.5 

## sites with manual method FRM sites are in the APCD network as of December 31, 2008,

and are suitable for comparisons to the annual PM 2.5 

## NAAQS.

The PM 2.5 

## monitors (with POC codes) in this area are:

08 069 0009-1 Fort Collins-CSU, 251 Edison Drive

08 123 0006-1 Greeley-Hospital, 1516 Hospital Road

08 123 0008-1 Platteville , 1004 Main Street



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. The Denver metropolitan

area consists of all of Denver County, the western ha lf of Adams and Arapahoe counties, most of Boulder

and Jefferson counties, the northern portion of Do uglas County and none of Clear Creek and Gilpin

counties. The following PM 2.5 

## sites with manual method FRM sites are in the APCD network as of

December 31, 2008, and are suitable for comparisons to the annual PM 2.5 

## NAAQS.

The PM 2.5 

## monitors (with POC codes) in this area are:

08 001 0006-1 Commerce City, 7101 Birch Street

08 005 0005-1 Arapahoe Community Co llege, 6190 S. Santa Fe Boulevard

08 013 0003-1 Longmont-Municipal, 350 Kimbark Street

08 013 0012-1 Boulder/Chamber Building, 2440 Pearl Street

– Middle scale site but determined to be representative of neighborhood scale with

several contiguous middle scale sites in that area of Boulder. EPA approved.

08 031 0002-1 Denver CAMP, 2105 Broadway

– micro scale but determined to be representative of neighborhood scale with several

contiguous micro scale sites in downtown Denver. EPA approved.

08 031 0023-1 Denver Swansea, 4650 Columbine Street

08 031 0025-1 Denver Animal Sh elter, 678 S. Jason Street

08 035 0004-1 Chatfield Reservoir, 11500 N. Roxborough Park Road



# El Paso, Park, Pueblo, Elbert & Teller Counties

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 24 

## This area has a population of 807,732 according to the July 2007 population estimate this is an

increase of 12.0 percent from the 2000 census. It is a very popular tourist area with rapid urban growth.

The land usage varies from open prairies in eastern El Paso County to very mountainous in Teller and

Park Counties. Only El Paso County has a large urba nized area, Colorado Springs, with a population of

394,177 according to the July 2007 estimate. This is an increase of 9.2 percent since the 2000 census. The

City of Colorado Springs and El Paso County both ope rate separate monitoring networks that are not

included as a part of this report. The following PM 2.5 

## sites with manual method FRM sites are in the

APCD network as of December 31, 2008, and are suitable for comparisons to the annual PM 2.5 

## NAAQS.

## The PM 2.5 

## monitors (with POC codes) in this area are:

08 039 0001-1 Elbert County, 24950 Ben Kelly Road

08 041 0017-1 Colorado College, 130 W. Cache la Poudre Street

08 101 0012-1 Pueblo, 211 E. D Street



# Western Counties

The Western Slope consists of the 21 counties w est of the Continental Divide. The population of

the area is 579,813 (July 2007 popul ation estimate). This is an increase if 14.4 percent over the 2000

census. However, the population is not evenly distributed among the counties and ranges from Mesa

County with 140,416 to San Juan Count y with only 571 according to the July 2007 estimate. Short-term

special purpose monitoring for carbon monoxide has been done in Summit County at Vail and near the oil

shale projects of Rio Blanco County. Grand Junction is the largest city on the western slope with a

population of 53,662 (July 2007 estimate). This is an increase of 27.8 percent from the 2000 census. The

following PM 2.5 

## sites with manual method FRM sites are in the APCD network as of December 31, 2008,

and are suitable for comparisons to the annual PM 2.5 

## NAAQS.

The PM 2.5 

## monitors (with POC codes) in this area are:

08 077 0017-1 Grand Junction- Powell, 650 South Avenue



# PM 2.5 

# Sites not intended for NAAQS Comparison

The following sites and POC codes are not intended for comparison with the NAAQS:

08 001 0006-3 Commerce City, 7101 Birch Street

08 013 0003-3 Longmont-Municipal, 350 Kimbark Street

08 013 1001-3 Boulder CU/Athens, 2440 Pearl Street

08 031 0002-3 Denver-CAMP, 2105 Broadway

08 031 0013-3 Denver NJH-E, 14 th 

## Avenue and Albion Street

08 031 0025-3 Denver Municipal Animal Shelter, 678 S. Jason Street

08 035 0004-3 Chatfield Reservoir, 11500 N. Roxborough Park Road

08 041 0017-3 Colorado College, 130 W. Cache la Poudre

08 045 0007-1 Rifle, Henry Building, 144 N. 3 rd 

## Street

08 069 0009-3 Fort Collins-CSU, 251 Edison Drive

08 077 0017-3 Grand Junction- Powell, 650 South Avenue

08 083 0006-1 Cortez, 106 W. North Street

08 123 0006-3 Greeley-Hospital, 1516 Hospital Road



# Community Monitoring Zones

Community monitoring zones are an additional method of defining an area for comparison with

the PM 2.5 

## NAAQS where two or more monitors are averaged together for comparison with the standard.

Currently, the APCD does not have any areas where this technique is used.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 25 

## The definition of community monitoring zone (CMZ) in 40 CFR Part 58.1 is as follows:

“Community monitoring zone (CMZ) means an optio nal averaging area with established, well defined

boundaries, such as county or census block, within an MPA that has relatively uniform concentrations of

annual PM 2.5 

## as defined by appendix N of part 50 of this chapter. Two or more community oriented

SLAMS monitors within a CMZ that meet certain requ irements as set forth in appendix N of part 50 of

this chapter may be averaged for making comparisons to the annual PM 2.5 

## NAAQS.” The CMZ is an

optional technique that averages the PM 2.5 

## 24-hour concentrations from two or more monitors located in

the same community.

## If the PM 2.5 

## monitoring network is changed by the cr eation/change of a CMZ or changing the

location of a violating monitor, then the APCD will ask EPA Region VIII for approval via the current

network modification process, and then notify the a ppropriate governments of affected communities. The

APCD will also provide the proposed changes to th e affected communities and concerned citizens on our

web site. A public comment period will be open for thir ty (30) days prior to the APCD selecting a new

site. Many times the APCD has no cont rol over a site closure. For example, a site is closed due to the

planned demolition of the building that hosts the mon itor. In such cases a new site must be found. The

PM 2.5 

## instruments may be moved to a temporary site and monitoring resumed. However, the final site

selection will go through the public vetting process to locate the best possible site.



# Planned Changes in PM 2.5 

# Monitoring for 2009/2010

1. The Pueblo site will be relocated in 2009 due to the construction of a tall building next to the

current building.

2. Addition of a PM 10/2.5 

## TEOM in Fort Collins in 2009.

3. Possible relocation of Boulder CU/Athens TEOM s ite due to new construction near the site.

4. Add URS carbon sampler for PM 2.5 

## chemical speciation at the Platteville and Grand Junction/

Powell sites in 2009.

5. Plan to move PM 2.5 

## chemical speciation sampler from the Grand Junction Powell to NCore

site at DMAS by December 31, 2009.



# Total Suspended Particulates and Lead Monitoring

In December 2006 Total Suspended Particulate (TSP) monitoring by the Air Pollution Control

Division was reduced from six monitors to a single m onitor at the Denver Municipal Animal Shelter. TSP

is monitored only as a first step in ambient lead anal ysis. In the past ten years the maximum quarter lead

concentration has generally been less than a tenth of the standard. In addition, Colorado has not recorded

an exceedance of the lead standard since the first quarter of 1980.

The Division reviewed its stationary sources da tabase for all point sources that emit lead in

Colorado. There were 32 lead sources identified in a database retrieval c onducted in November, 2008.

None of the sources emit greater than one ton per year (TPY) of total lead, which includes elemental lead

and all lead compounds. Thus, no lead monitors are re quired at any point source facility in Colorado.

The U.S. EPA calculated emissions for lead at general aviation airports due to piston engine

aircraft, which continue to use leaded aviation fuel . According to EPA, Centennial Airport has the second

highest lead emissions of any airport in the country at 1.18 TPY. Since, this emissions estimate exceeds

the threshold for lead; the Division will locate a lead samp ling site at or near the Centennial Airport. This

monitoring site must be installed by Jan. 1, 2010.



# Metropolitan Denver Counties

This area includes the Front Range Counties of Adams, Arapahoe, Boulder, Broomfield, Clear

Creek, Douglas, Gilpin, Jefferson and Denver. The population of the area is 2,749,032 (July 2007

population estimates). This is an increase of 12 percent from the 2000 census. The Denver metropolitan

area consists of all of Denver County, the western ha lf of Adams and Arapahoe counties, most of Boulder

and Jefferson counties, the northern portion of Do uglas County and none of Clear Creek and Gilpin

counties.

The TSP/Lead monitor in this area is:

08 031 0025 Denver Municipal Anim al Shelter, 678 S. Jason Street

– This site served as the CFR required regional lead site until the new lead standard was

promulgated in December 2008.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 26

# New Lead NAAQS

In November 2008, a new TSP lead NAAQS was pr omulgated at a level of 0.15 micrograms per

cubic meter based on a 3-month rolling average. Th is new standard set forth new requirements for

required monitoring sites to include:

1. At least one site located around sources with lead emissions greater than one TPY. Sourceoriented monitoring must commence by January 1, 2010.

2. At least one site in CBSAs with populati ons greater than 500,000. Population-oriented

monitoring must commence by January 1, 2011.

For Colorado, only one source has been identified with emissions greater than one TPY. It is

Centennial Airport. The ideal goal is have source-orient ed monitors located in ambient air at the predicted

maximum lead concentration area. Typically, the loca tion of maximum lead concentration for airports

will be downwind of the take off strip near the “b last fence.” Discussions will be undertaken with

Centennial Airport to meet this requirement as close as possible and a monitor will be installed by the end

of 2009. One other source, CENC Golden Energy, h as been identified in the NEI as possibly having over

one TPY of lead emissions. However, permit and actua l emission levels have s hown this facility does not

exceed this threshold.

In Colorado, there are two CBSAs that are ove r populations of 500,000. They are Denver and

Colorado Springs. The Denver area is already monitore d with the Denver Municipal Animal Shelter (08

031 0025) site. One additional site w ill be installed in Colorado Springs by the end of 2010 to meet the

monitoring requirements. At this time, the monitor will most likely be placed at the existing Colorado

College (08 041 0017) site unless modeling or other guidance indicates otherwise.



# Planned Changes in TSP and Lead Monitoring for 2009/2010

1. In 2009 the Division will establish a source-oriented TSP/Lead monitor at Centennial Airport.

This site is needed due to the changes in th e lead monitoring regulations that require sourceoriented monitoring at facilities with emi ssions of more than one ton per year.

2. A new population oriented led monitor will be established in Colorado Springs in 2010. This site

is in response to changes in new minimum population requirements for lead monitoring.



# Quality Assurance Accuracy Audits for Particulate Monitors

The audit checks performed on the particulate mon itors consist of calibrated flow checks. The

following table shows the number of these audits co nducted on the particulate samplers/analyzers for

2008.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 27

## Table 12 - Accuracy Audits for Particulates in 2008

Site / Station Name PM 2.5



### PEP PM 2.5



### FRM/FEM PM 10



### Low-Vol PM 10 

### High-Vol TSP TEOM (2.5) 

### TEOM (10)



### Commerce City 4 4 3

Commerce City (collocated) 4

Welby 4 4

Chatfield Reservoir 4 4

A lamosa - ASC 16

A lamosa - Municipal Bldg 16

A rapahoe Community College 4

Pagosa Springs. Middle School 16

Longmont - Municipal 4 4 4

Boulder Chamber of Commerce 4 4

Boulder - CU/Athens 4

Delta 8

Denver - CAMP 4 4 3 3

Denver - CAMP (collocated) 4 4

Denver Municipal Animal Shelter

(primary) 4 4 4 4 4

Denver Municipal Animal Shelter

(collocated) 4 4

Denver - Swansea 3

Denver Visitor Center 16

Denver - NJH 3

Elbert 4

Colorado Springs - RBD 1 1

Co. Springs - RBD (collocated) 1

Colorado College 4 4 3

Cañ on City – City Hall 4

Parachute 6

Rifle 8

Crested Butte 8

Mt. Crested Butte 16

Durango River City Hall 8

Ft. Collins - CSU 3 4 8

Grand Junction - Powell 3 4 4 3

Grand Junction - Powell (collocated) 4

Clifton 8

A spen Library 8

Lamar Power Plant 16

Lamar - Municipal 16

Pueblo Public Works 4 8

Steamboat Springs 12

Telluride 8

Breckenridge 16

Greeley - Hospital 4 8 4

Platteville 3

Total Particulate Audits 6 67 20 256 8 35 11

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 28

# Quality Assurance Precision Checks for Particulate Monitors

The precision checks that are made on particulate mo nitors consist of samplers that operate sideby-side on the same operating schedule. The samples are th en compared to ensure that the data are within

federal limits.

Table 13 - Precision Checks for Particulates in 2008

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 29 Site 1st Quarter 2nd Quarter 3rd Quarter 4th Quarte r

TSP

Denver Municipal Animal Shelte r 15 15 15 14

LEAD

Denver Municipal Animal Shelte r 15 15 15 10

PM 10 

## High-Volume

Denver - CAMP

Denver Municipal Animal Shelte r 15 14 15 14

Colorado Springs - RBD 16

Crested Butte 15

PM 10 

## Low-Volume

Grand Junction - Powell 15 15 15 12

PM 2.5 

## FEM

Commerce City 15 15 15 15

Denver - CAMP 16 15 15 15

Grand Junction - Powell

PM 2.5 

## Continuous

Commerce City 3 6 7 5

Longmont - Municipal 5 2 4 5

Boulder - CU/Athens 3 3 4 6

Denver - CAMP 5 4 6 6

Denver - NJH 6 6 6 5

Chatfield 6 6 6 5

Denver Municipal Animal Shelte r 3 6 7 6

Colorado College 4 6 7

Grand Junction - Powell 5 5 4 3

Greeley - Hospital 6 6 5 6

PM 10 

## Continuous TEOM

Welb y 8 7 7 6

Denver - CAMP 6 5 7 7

Denver Municipal Animal Shelte r 4 6 8 6

PM 10 

## Continuous Beta

Grand Junction - Pitkin 5 5 4 0

# Appendix A - Carbon Monoxide Site Descriptions

Welby, 3174 E. 78 th 

# Avenue (08 001 3001)

Located 8 miles north-northeast of the Denver Centra l Business District (CBD) on the bank of the

South Platte River, this site is ideally located to measure nighttime drainage of the air mass from the

Denver metropolitan area and the thermally driven, da ytime upriver flows. The monitoring shows that

high carbon monoxide levels are associated with winds from the south-southwest. While this is the

direction of five of the six major sources in the area, it is also the direction of the primary drainage winds

along the South Platte River.

Carbon monoxide monitoring began in 1973 an d continued through the spring of 1980.

Monitoring was stopped from the spring of 1980 until October 1986 when it began again as a special

study. Welby has not recorded an exceedance of either the 1-hour or 8-hour carbon monoxide standard

since January 1988. In the last few years its primary value has been as an indicat or of changes in the air

quality index (AQI).



# Longmont, 440 Main Street (08 013 0009)

The town of Longmont is a growing, medium sized, Front Range community. Denver/Boulder

Metro-area and Fort Collins. Longmont is both subur ban and rural in nature. There are no major carbon

monoxide sources within 12 miles of the monitor.

In January and February of 1988 and again in th e winter of 1988/89 the APCD conducted a study

at a site near 11 th 

## Avenue and Main Street, a few blocks north of the downtown area. Because two

exceedances of the standard were recorded during the study, the Division felt that a permanent carbon

monoxide site should be established closer to the downtown area. These exceedances resulted in

Longmont being designated as a carbon monoxide no nattainment area and required a SIP for carbon

monoxide be developed show ing attainment by December 31, 1995. The Air Quality Control Commission

accepted the Longmont SIP on June 16, 1995. In 1999, Longmont was redesignated as an attainment area.

Longmont has contended that its carbon monoxide problem s are generally the result of transport from the

Denver metropolitan area north to the Longmont area. The review of the time series plots for Longmont,

Denver CAMP, Greeley and Boulder show that th e carbon monoxide maximum at all four locations

generally coincide. In addition these peaks are bimoda l at 7 to 9 A.M. and 4 to 6 P.M. at all four

locations. This pattern is associated with locally generated emissions from traffic, not transport from

another area. The carbon monoxide emissions inventori es developed for the SIP show that 78 percent of

the carbon monoxide comes from on-road mobile so urces. These findings are consistent with the

observed distribution of the data.

Carbon monoxide monitoring is expected to conti nue for the next several years at the current

location since the monitoring is a part of the maintenance plan for Longmont.



# Denver CAMP, 2105 Broadway (08 031 0002)

The Denver CAMP site is located in the north-central part of the Denver CBD. Denver is the

largest city in Colorado. Carbon monoxide monitoring began in February 1965 as a part of the Federal

C ontinuous A ir M onitoring P roject. It was established as a maximum concentration, population-oriented

monitor. The CAMP site measures the exposure of the people who work or reside in the CBD. Its location

in a high traffic street canyon causes this site to r ecord most of the high pollution episodes in the metro

area. The street canyon effect at CAMP results in variable wind directions for high carbon monoxide

levels and as a result wind direction is less relevant to high concentrations than wind speed. Wind speeds

less than 1 mph, especially up-valley, combined with te mperature inversions trap the pollution in the area.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 30 

## Historically the CAMP monitor has recorded some of the highest carbon monoxide levels in the

state. It has not recorded an 8-hour concentration over the standard since 1995. The concentrations have

## continued their steady decline to the point that in 2008 they are now l ess than one third the level of the

standard.



# Denver Firehouse #6, 1300 Bl ake Street (08 031 0019)

The Denver Firehouse #6 is located on the block between Auraria Parkway and Blake Street

where they intersect with Speer Boulevard. This is one of the busiest intersections in downtown Denver

and computer modeling indicated that it would have high leve ls of carbon monoxide.

In the winter of 1995 the monitor was convert ed from a special purpose monitor to a SLAMS

monitor. In 1999 the Firehouse monitor recorded the last exceedance of the 8-hour CO standard in the

Denver Metro area. The levels have continued their decline and in 2008 the maximum 8-hour

concentration was 2.4 ppm.



# Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter (DMAS) site was established as a replacement for the

Denver Gates particulate monitor that was located at 1050 S. Broadway about one half mile southsoutheast and on the other side of the South Platte River and I-25 South. The DMAS location represents

the core area of the South Platte drainage in Denver. It has a good mixture of light industrial, residential

areas and is strongly affected by the mobile sources along I-25 as well as South Santa Fe Drive. The

openness of the area also permits the meteorological da ta to be representative of the larger core Denver

area. Finally the site is on City owned property a nd will presumably be available for long-term trend

analysis. When fully developed the site will be established as the NCore site for the Denver Metropolitan

area and will include a trace/precursor-level carbon monoxide analyzer.



# Colorado Springs Hwy-24, 690 W. Highway 24 (08 041 0015)

The 690 W. Highway 24 site is located just to the west of I-25 and just to the east of the

intersection of U.S. Highway 24 and 8 th 

## Street, approximately 0.8 miles to the west of the Colorado

Springs CBD. Commencing operation in November 1998, th is site is a replacement for the Tejon Street

(08 041 0004) carbon monoxide monitor. The site is locat ed in the Fountain Creek drainage and is in one

of the busiest traffic areas of Colorado Springs. Addi tionally, traffic is prone to back-up along Highway

24 due to a traffic light at 8 th 

## Street. Thus, this site is well suited to monitor maximum concentrations of

carbon monoxide in the area both from automotive sources and also from nearby industry which includes

a power plant. It also provides a micro-scale setti ng for the Colorado Springs area, which has not been

possible in the past.



# Fort Collins- Mason, 708 S. Mason Street (08 069 1004)

Fort Collins does not have the population to require a carbon monoxide monitor under Federal

regulation. However, it is one of the largest c ities along the Front Range and was declared in

nonattainment for carbon monoxide in the mid-1970s afte r exceeding the 8-hour standard in both 1974

and 1975. The current level of monitoring is in part a function of the resulting carbon monoxide SIP for

the area.

The 708 S. Mason Street site began operation in December 1980 and is located one block west of

College Avenue in the Central Business District. Th e 1-hour carbon monoxide standard of 35 ppm as a 1-

hour average has only been exceeded on December 1, 1983, at 4:00 P.M. and again at 5:00 P.M. The

values reported were 43.9 ppm and 43.2 ppm respectively. The 8-hour standard of 9 ppm, as an 8-hour

average, was exceeded one or more times a year from 1980 through 1989. The last exceedances were in

1991 on January 31 and December 6 when values of 9.8 ppm and 10.0 ppm respectively were recorded.



# Grand Junction - Pitkin, 6451⁄4 Pitkin Avenue (08 077 0018)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 31 

## The Grand Junction-Pitkin monitor began operati on in January 2004. This monitor replaced the

monitor at the Stocker Stadium. The Stocker Stadium lo cation had become less than ideal with the growth

## of the trees surrounding the park and the Division felt that a location nearer to the CBD would provide a

better representation of carbon monoxide concentration values for the city. The carbon monoxide

concentrations at the Stocker Stadium site had b een declining from an 8-hour maximum in 1991 of 7.8

ppm to a 3.3 ppm in 2003. The Powell monitor has shown a continuing decline in values to a 1.8 ppm in

2007. These levels are approaching the detec tion limits of the carbon monoxide monitor.



# Greeley West Annex Bldg, 905 10 th 

# Avenue (08 123 0010)

Greeley does not have the population to requi re a carbon monoxide monitor under Federal

regulation. However, it is one of the larger c ities along the Front Range and was declared in

nonattainment for carbon monoxide in the late-1970s af ter exceeding the 8-hour standard in 1976 and

1977. The first Greeley monitor operated from Decemb er 1976 to December 1980. It was located at 15 th



## Street and 16 th 

## Avenue and exceeded the 8-hour standa rd numerous times from 1976 through 1980.

The 811 15 th 

## Street location began operation in N ovember 1981 and was discontinued in 2002.

The current monitor is located in the Weld County H ealth Department Annex. This location is in the

Greeley Central Business District. The levels recorded at this site are comparable but slightly lower than

those at the former 811 15 th 

## Street site, about a quarter of the 8-hour standard.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 32

# Appendix B - Ozone Site Descriptions

Welby, 3174 E. 78 th 

# Avenue (08 001 3001)

The Welby ozone site began operation in July 1973. In 1974, Welby recorded a 1-hour

concentration of 0.375 ppm. This is the highest level of ozone ever reported in the State. Since then it has

experienced a declining trend of ozone and now records so me of the lowest levels in the area. It is unclear

if declining levels are due to controls on precursor s, increases in nitric oxide levels, high levels of

precursors present in the area of the site, or a shift in the path of the ozone “cloud.” Its location in the up

and down river drainage path of the Denver air mass th at has been “cooking” gives either a warning of the

events to come or the results of the day's exposure. The site serves as a good drainage location but it may

be a target for deletion or relocation farther dow n the South Platte River valley from Denver.

The Welby monitor has not recorded an exceedance of the old 1-hour standard since 1998. It

would not have recorded an exceedance of the new 8-hour standard since 1998. However, the trend in the

3-year average of the 4 th 

## maximum 8-hour average has been increasing since 2002. The site is still not

expected to exceed the new standa rd in the near future though.



# Highland Reservoir, 8100 S. University Boulevard (08 005 0002)

The Highlands site began operation in 1978. It was intended to be a background location.

However, with urban growth and the construction of C-470, it has become a long-term trend site that

monitors changes in the air quality of the area. It is currently believed to be near the southern edge of the

ozone “cloud,” although it may not be in the area of maximum concentrations. Th e Highlands site would

have exceeded the new standard eight of the last ten years.



# Aurora – East, 36001 Quincy Ave. (08 005 0006)

The Aurora East site began operation in June 2009 . It is intended to act as a background site and

an aid in the determination of the easternmost extent of the ozone “cloud” in the metro area. It is located

along the eastern edge of the former Lowry bombing range, on a flat, grassy plains area. This site is

currently outside of the rapid urban growth ar ea taking place around Aurora Reservoir. There are

currently plans to begin developing the Lowry area in the near future, however, which would shift the

focus of this site from being a backgr ound site to an urban corridor site.



# Boulder, 14051⁄2 S. Foothills Parkway (08 013 0011)

The city of Boulder is located about 30 miles to the northwest of Denver. The Boulder Foothills,

South Boulder Creek site was established as a special purpose ozone monitor as a part of the “Summer

1993 Denver Ozone Study.” During that summer a 1-hour level of 0.128 ppm was recorded on July 2,

1993. In 1994 the monitor was converted from an SPM to a seasonal SLAMS and in 1995 to a year-round

ozone monitor when the instruments were moved into a new shelter. The South Boulder Creek monitor

has not recorded an exceedance of th e 1-hour NAAQS since the summer of 1993.

Although the Foothills monitor had not exceeded th e previous standard of 0.085 ppm as an 8-hour

average. It would have exceeded the new standard of 0.075 ppm as an 8-hour average five of the past six

years.



# Denver - Carriage, 2325 W. Ir ving Street (08 031 0014)

Carriage is located 2.5 miles west of the CBD . The site represents an ideal neighborhood

exposure setting due to its unique location in an old carriage lot in the center of the block surrounded by

houses. The Carriage ozone site began operation in 1 981. It represents a good nei ghborhood site for ozone

exposure since it is isolated enough to be unaffected by local traffic. Ozone levels at this site have not

exceeded the old 1-hour NAAQS since 1987. The Denve r Carriage monitor would have exceeded the new

standard only once in the past ten years.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 33

# Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter (DMAS) wa s established as a replacement for the Denver

Gates particulate monitor that was located at 1050 S. Broadway about one half mile south-southeast and

on the other side of the South Platte River and I-25 South. The DMAS location represents the core area of

the South Platte drainage in Denver. It has a good mixture of light industrial, residential areas and is

strongly affected by the mobile sources along I-25 as well as South Santa Fe Drive. The openness of the

area also permits the meteorological data to be repr esentative of the larger core Denver area. Finally the

site is on City owned property and will presumably be available for long-term trend analysis. When fully

developed the site will be es tablished as the NCore site for the Denver Metropolitan area.



# Chatfield Reservoir, 11500 N. Roxborough Park Road (08 035 0004)

The Chatfield Reservoir location was establishe d as the result of the 1993 Summer Ozone Study.

The site is located on the south side of Chatfield R eservoir at the park offices. This location was selected

over the Corps of Engineers Visitor Center across the reservoir because it was more removed from the

influence of traffic along C-470. Located in the South Platte River drainage, th is location is well suited

for monitoring southwesterly ozone formation in the Denver metro area. The Chatfield monitor would

have exceeded the new standard each of the past f our years and the trend of the 3-year averages is

increasing.



# Colorado Springs, USAFA Road 640 (08 041 0013)

The United States Air Force Academy site was installed as a replacement maximum

concentration ozone monitor for the Chestnut Street (08 041 0012) site. Modeling in the Colorado Springs

area indicates that high ozone concentrations should generally be found along either the Monument Creek

drainage to the north of the Colorado Springs CBD or to a lesser extent along the Fountain Creek drainage

to the west of the CBD. The decision was made to lo cate this site near the Monument Creek drainage,

approximately 9 miles north of the CBD. This locatio n is near the south entrance of the Academy but

away from any roads.

The Academy monitor did record an exceedance of the old 1-hour standard in 2003 but it would

not have recorded any exceedances of the new 8-hour st andard. However the trend in values over the past

ten years is increasing.



# Manitou Springs, 101 Banks Place (08 041 0016)

Manitou Springs is a located 4 miles west of Co lorado Springs. It was established because of

concern that the “ozone cloud” was traveling farthe r up the canyon and the current monitoring network

was not adequate. The Manitou Springs monitor began operations in April 2004. It is located in the

foothills above Colorado Springs in the back of the maintenance area. In its four seasons of operation it

has not recorded any levels greater than the new standard. The trend in 8-hour concentrations is

increasing.



# Rifle - Health, 195 14 th 

# Ave. (08 045 0012)

The Rifle Health site is located at the Garfield County Health Department building. The site is

1km to the north of the downtown area and next to the Garfield County fairgrounds. The site is uphill

from the downtown area. A small residential area is to the north and a commercial area to the east. This

site was established to measure ozone in Rifle, whic h is the largest population center in the oil and gas

impacted area of the Grand Valley. Monitoring commenced in June 2008.



# Arvada, 9101 57 th 

# Avenue (08 059 0002)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 34 

## The city of Arvada is located 15 miles west-nor thwest of the Denver CBD. The Arvada site began

operation before 1973. It is located to the northwest of the Denver CBD near the western end of the

diurnal midday wind flow of the ozone “cloud.” As a result, when conditions are proper for daylong

## ozone production, this site has received some of the highest levels in the city. In the early and mid 1970s,

these wind patterns caused Arvada to have the most vi olations in the metro area. The Arvada monitor

would have exceeded the new standard six of the p ast ten years and the years that it would not have

exceeded the standard it was just below the level of the standard.



# Welch, 12400 W. Highway 285 (08 059 0005)

The Division conducted a short-term ozone study on the grounds of Chatfield High School from

June 14, 1989 until September 28, 1989. The Chat field location was chosen because it sits on a ridge

southwest of the Denver CBD. Wind pattern studies show ed a potential for elevated ozone levels in the

area on mid to late afternoon summer days. There were no exceedances of the NAAQS recorded at the

Chatfield site but the levels were frequently higher th an those recorded at the other monitoring sites south

of the metro area.

One finding of the study was the need for a new, permanent site further north of the Chatfield

High School location. As with most Denver locations , the predominant wind pattern is north/south. The

southern flow occurs during the upslope, daytime wa rming period. The northern flow occurs during late

afternoon and nighttime when drainage is caused by cooling and settling. The major drainages of Bear

Creek and Turkey Creek were selected as target dow nwind transport corridors. These are the first major

topographical features north of the Chatfield site. A point midway between the valley floor (Englewood

site) and the foothill’s hogback ridge was modeled to be the best estimate of the maximum downwind

daytime transport area. These criteria were used to ev aluate available locations. The Welch site best met

these conditions. This site is located off State Highway 285 between Kipling Street and C-470.

The Welch monitor would not have exceeded the ne w standard in the past ten years. However,

since 2002 the trend in values is increasing and in 20 08 the 3-year average was above the level of the

standard.



# Rocky Flats - N, 16600 W. Highway 128 (08 059 0006)

The Rocky Flats - N site is located north-north east of the plant on the south side of Colorado

Highway 128, approximately 11⁄4 miles to the west of Indiana Street. The site began operation in June

1992 as a part of the first phase of the APCD’s monitoring effort around the Rocky Flats Environmental

Technology Site.

Ozone monitoring began as a part of the “Summer 1993 Ozone Study”. The monitor recorded

some of the highest ozone levels of any of the s ites during that study. Therefore, it was included as a

regular part of the APCD ozone-monitoring network. The Rocky Flats – N monitor would have exceeded

the new standard each of the last ten years a nd thirteen out of the last fifteen years.



# NREL Solar Radiation Research Labo ratory, 2054 Quaker Street (08 059 0011)

The National Renewable Energy Laboratory (NREL) site is located on the south rim of South

Table Mountain, near Golden and was part of th e 1993 Summer Ozone Study. Based on the elevated

concentrations found at this location, it was made a perm anent monitoring site in 1994. This site typically

records some of the higher 8-hour ozone concentrati ons in the Denver area. It would have exceeded the

new standard each of the past thirt een years it has been in operation.



# Aspen Park, 26137 Conifer Road (08 059 0013)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 35 

## The Aspen Park site began operation in May 2009. It is intended to verify/refute model

predictions of above normal ozone le vels. In addition, passive ozone m onitors used in the area in a 2007

study indicated the possibility of larger than norma l ozone levels. The monitor is located in an urban

setting at a Park N Ride facility off of Highway 285, at an elevation of just over 8,100 feet. Because the

site is nearly 3,000 feet higher than the average metro area elevation, it should see ozone levels that are

larger than those seen in the metro area, as ozone concentrations increase with increasing elevation.

## Whether or not the increased concentrations will be a health concern will be determined with the data

gathered from this monitor.



# Fort Collins - West, 3416 W. La Porte Avenue (08 069 0011)

The Fort Collins-West monitor began operation in May of 2006. The location was established

based on modeling and to satisfy pe rmit conditions for a major source in Fort Collins area. The levels

recorded for the first season of operation have shown consistently higher concentr ations than the 708 S.

Mason Street monitor. For 2008 the 8-hour average, 4 th 

## maximum was 0.085 ppm. The 4 th 

## maximum, 8-

hour average at the Mason Street monitor was 0.069 ppm for the same period.



# Fort Collins - Mason, 708 S. Mason Street (08 069 1004)

The Fort Collins ozone site has been in op eration since 1981 and has recorded only one

exceedance of the former 1-hour standard since it began operation. It has only recorded four

concentrations greater than the level of the 8-hour standard and has not ever had a third or fourth

maximum concentration at or above the level of the 8-hour standard. Monitoring in this area will likely

continue so that changes in the Fort Collins area ma y be examined, although violations are not expected.

At this time there have not been any changes in th e area that would require adjustment in the current

monitoring level. Due to the size of the community, elevated ozone readings in Fort Collins probably

result from second day transport/reactions from the Denver area.



# Rist Canyon, 11838 Rist Canyon Road, (08 069 0011)

The Rist Canyon site began operation in May 200 9. The monitor is located within the Rist

Canyon Volunteer Fire Department Station Number 1, in the foothills west of Fort Collins. The monitor is

at an elevation of 6,750 feet, which is roughly 1,600 feet above the Fort Collins – West monitor. Model

predictions have indicated the development of larger than normal ozone levels in this area. The site is

intended to verify/refute the model prediction.



# Palisade Water Treatment, Rapid Creek Rd (08 077 0020)

The Palisade site is located at the Palisade Wate r Treatment Plant. The site is 4km to the eastnortheast of downtown Palisade, ju st into the De Beque Canyon area. The site is remote from any

significant population and was established to measure maximum concentrations of ozone that may result

from summertime up-flow conditions into a topograp hical trap. Monitoring commenced in May 2008.



# Cortez, 106 W. North St. (08 083 0006)

The Cortez site is located in downtown Cortez at the Montezuma County Health Department

building. Cortez is the largest population center in Montezuma County in the southwest corner of

Colorado. This site was established to address comm unity concerns of possible high ozone from oil and

gas and power plant sources in the area. Many of these sources are in New Mexico. Monitoring

commenced in May 2008.



# Greeley - Weld County Tower, 3101 35 th 

# Avenue (08 123 0009)

The Weld County Tower monitor began operation in June 2002. The site was established after the

811 15 th 

## Street building was sold and was scheduled for demolition. The Weld County Tower site has

generally recorded levels greater than the old site and would have exceeded the new standard each year

since it began operation in 2002.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 36

# Appendix C - Nitrogen Dioxide Site Descriptions

Welby, 3174 E. 78 th 

# Avenue (08 001 3001)

The Welby nitrogen dioxide site began operation in July 1976. Its location in the up and down

river drainage path of the Denver air mass that has b een “cooking” gives either a warning of the events to

come or the results of the day's exposure. The s ite serves as a good drainage location but it may be a

target for deletion or relocation farther down the South Platte River valley from Denver.



# Denver CAMP, 2105 Broadway (08 031 0002)

The City and County of Denver is located approximately 30 miles east of the foothills of the

Rocky Mountains. Denver sits in a basin and the terrain of the city is characterized as gently rolling hills

with the Platte River running from southwest to northeast just west of the downtown area.

The site represents a location typical of most of the downtown Denver area. The Division has

shown that the downtown Denver area and the fringe area surrounding the downtown area is

homogeneous and indicates that the CAMP station is representative of a wider area. Thus, the CAMP

nitrogen dioxide site is represen tative of a neighborhood scale area.



# Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter (DMAS) wa s established as a replacement for the Denver

Gates particulate monitor that was located at 1050 S. Broadway about one half mile south-southeast and

on the other side of the South Platte River and I-25 South. The DMAS location represents the core area of

the South Platte drainage in Denver. It has a good mixture of light industrial, residential areas and is

strongly affected by the mobile sources along I-25 as well as South Santa Fe Drive. The openness of the

area also permits the meteorological data to be repr esentative of the larger core Denver area. Finally the

site is on City owned property and will presumably be available for long-term trend analysis. When fully

developed the site will be es tablished as the NCore site for the Denver Metropolitan area.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 37

# Appendix D - Sulfur Dioxide Site Descriptions

Welby, 3174 E. 78 th 

# Avenue (08 001 3001)

The Welby sulfur dioxide site be gan operation in July 1975. Its location in the up and down river

drainage path of the Denver air mass that has been “c ooking” gives either a warning of the events to come

or the results of the day's exposure. The site serve s as a good drainage location but it may be a target for

deletion or relocation farther down the South Platte River valley from Denver.



# Denver CAMP, 2105 Broadway (08 031 0002)

The City and County of Denver is located approximately 30 miles east of the foothills of the

Rocky Mountains. Denver sits in a basin and the terrain of the city is characterized as gently rolling hills

with the Platte River running from southwest to northeast just west of the downtown area.

However, this site represents a location typical of most of the downtown Denver area. This area

has similar land uses, VMT (vehicle miles traveled) and sulfur dioxide sources. The Division has shown

that the downtown Denver area and the fringe area surrounding the downtown area is homogeneous and

indicates that the CAMP station is representative of a wider area. Thus, the CAMP sulfur dioxide site is

representative of a neighborhood scale area.



# Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter (DMAS) wa s established as a replacement for the Denver

Gates particulate monitor that was located at 1050 S. Broadway about one half mile south-southeast and

on the other side of the South Platte River and I-25 South. The DMAS location represents the core area of

the South Platte drainage in Denver. It has a good mixture of light industrial, residential areas and is

strongly affected by the mobile sources along I-25 as well as South Santa Fe Drive. The openness of the

area also permits the data to be representative of the larger core Denver area. Finally the site is on City

owned property and will presumably be available for l ong-term trend analysis. When fully developed the

site will be established as the NCore s ite for the Denver Metropolitan area.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 38

# Appendix E - Meteorological Site Descriptions

Commerce City, 7101 Birch Street (08 001 0006)

The Commerce City monitor is located on the ro of of the Alsup Elementary School. It began

operation in November of 2001. The Commerce City site is in a predominantly residential area north of

the Denver Central Business District (CBD) near the Platte River valley downstream from the Denver

urban air mass.



# Welby, 3174 E. 78 th 

# Avenue (08 001 3001)

The Welby site began operation in July 1973. Th e site is located along the bank of the South

Platte River downstream from the Denver CBD. Welby is one of the longest continuously operating

monitoring sites in the system.



# Highland Reservoir, 8100 S. University Boulevard (08 005 0002)

The Highlands site began operation in 1978. It was intended to be a background location.

However, with urban growth and the construction of C - 470, it has become a long-term trend site that

monitors changes in the air quality of the area. It is a good orientation downwind from the Denver CBD.



# Aurora – East, 36001 Quincy Ave. (08 005 0006)

The Aurora East site began operation in June 2009 . It is intended to act as a background site and

an aid in the determination of the easternmost extent of the ozone “cloud” in the metro area. It is located

along the eastern edge of the former Lowry bombing range, on a flat, grassy plains area. This site is

currently outside of the rapid urban growth ar ea taking place around Aurora Reservoir. There are

currently plans to begin developing the Lowry area in the near future, however, which would shift the

focus of this site from being a backgr ound site to an urban corridor site.



# Denver CAMP, 2105 Broadway (08 031 0002)

The City and County of Denver is located approximately 30 miles east of the foothills of the

Rocky Mountains. Denver sits in a basin and the terrain of the city is characterized as gently rolling hills

with the Platte River running from southwest to northeast just west of the downtown area.

The winds at the CAMP site are strongly affected by the street canyon effect of the downtown

buildings. Meteorological data shows that winds ar e predominately from the south, south-southwest,

north and north-northwest. However, due to the downtow n location of this site, winds are shown to flow

from almost all directions at similar frequencies.



# Denver - Carriage, 2325 Irving Street (08 031 0014)

The Denver Carriage site is located 2.5 miles west of the CBD. The site represents an ideal

neighborhood exposure setting due to its unique location in an old carriage lot in the center of the block

surrounded by houses.



# Auraria Met, 12 th 

# Street & Auraria Parkway (08 031 0021)

The Auraria meteorological monitor is located at th e edge of the athletic fields and next to the

parking lot for Metropolitan State College/ CU Denver. The monitor is 230 feet away from the Auraria

Parkway and 350 feet from Speer Boulevard. It is one of the few locations in the CBD were wind data

will be little affected by the street canyon effect of the buildings.



# Denver Municipal 

# Animal Shelter, 678 S. Jason Street (08 031 0025)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 39 

## The Denver Municipal Animal Shelter was established as a replacement for the Denver Gates

particulate monitor that was located at 1050 S. Broadw ay about one half mile south-southeast and on the

## other side of the South Platte River and I-25 South. The DMAS location represents the core area of the

South Platte drainage in Denver. Meteorological mon itoring is expected to begin in the summer of 2007.



# Chatfield Reservoir, 11500 N. Roxborough Park Road (08 035 0004)

The Chatfield Reservoir location was establishe d as the result of the 1993 Summer Ozone Study.

The site is located on the south side of Chatfield Reservoir at the Park offices. This location is away from

the influence of trees and other influences.



# Arvada, 9101 W. 57 th 

# Avenue (08 059 0002)

The city of Arvada is located 15 miles west-nor thwest of the Denver CBD. The Arvada site began

operation before 1973. It’s location to the northwest of the Denver CBD near the western end of the

diurnal midday wind flow of the ozone “cloud” and de velopment in the area make this a good population

oriented site.



# Welch, 12400 W. Highway 285 (08 059 0005)

The Welch site is located off State Highway 285 between Kipling Street and C-470. It is

approximately 11 miles southwest of the Denver CBD and located between the drainages of Bear Creek

and Turkey Creek. It is in position to monitor the so uthern flow that occurs during the upslope, daytime

warming period and the northern flow , which occurs during late afternoon and nighttime when drainage is

caused by cooling and settling.



# Rocky Flats - N, 16600 W. Highway 128 (08 059 0006)

The Rocky Flats - N site is located north-northeast of the plant on the south side of Colorado

Highway 128, approximately 11⁄4 miles to the west of Indiana Street. The site began operation in June

1992 as a part of the first phase of the APCD’s monitoring effort around the Rocky Flats Environmental

Technology Site. It has continued after the closing of Rocky Flats because it is one of the highest

concentration ozone monitors in the state.



# Rocky Flats - SE, 9901 I ndiana Street (08 059 0008)

This site is located along Indiana Street southeast of Rocky Flats. The winds at this location are

appreciably different from either the Rocky Flats North site or the Arvada site.



# Aspen Park, 26137 Conifer Road (08 059 0013)

The Aspen Park site began operation in May 2009. It is intended to verify/refute model

predictions of above normal ozone le vels. In addition, passive ozone m onitors used in the area in a 2007

study indicated the possibility of larger than norma l ozone levels. The monitor is located in an urban

setting at a Park N Ride facility off of Highway 285, at an elevation of just over 8,100 feet. Because the

site is nearly 3,000 feet higher than the average metro area elevation, it should see ozone levels that are

larger than those seen in the metro area, as ozone concentrations increase with increasing elevation.

Whether or not the increased concentrations will be a health concern will be determined with the data

gathered from this monitor.



# Rist Canyon, 11838 Rist Canyon Road, (08 069 0011)

The Rist Canyon site began operation in May 200 9. The monitor is located within the Rist

Canyon Volunteer Fire Department Station Number 1, in the foothills west of Fort Collins. The monitor is

at an elevation of 6,750 feet, which is roughly 1,600 feet above the Fort Collins – West monitor. Model

predictions have indicated the development of larger than normal ozone levels in this area. The site is

intended to verify/refute the model prediction.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 40

# Fort Collins - Mason, 708 S. Mason Street (08 069 1004)

The Mason Street site is the only meteorological site operated by the APCD in the Fort Collins

area.



# Grand Junction - Pitkin, 6451⁄4 Pitkin Avenue (08 077 0018)

This location monitors carbon monoxide, wind sp eed, wind direction, temperature and hourly

PM 10 

## . It is located at the northern edge of a low usage parking lot near the Powell monitor.



# Palisade Water Treatment, Rapid Creek Rd (08 077 0020)

The Palisade site is located at the Palisade Wate r Treatment Plant. The site is 4km to the eastnortheast of downtown Palisade, ju st into the De Beque Canyon area. The site is remote from any

significant population and was established to measure maximum concentrations of ozone that may result

from summertime up-flow conditions into a topograp hical trap. Monitoring commenced in May 2008.



# Lamar Port of Entry, 7100 US Highway 50, (08 099 0003)

The particulate monitors in Lamar have recorded some of the highest readings in the state. These

readings are primarily associated with east winds in excess of 20 mph. The Division first established a

meteorological monitor in Lamar at the Municipal Building but this location was too protected and the

monitor was moved to the Port of Entry location in March of 2005.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 41

# Appendix F - PM 10 

# Site Descriptions

Commerce City, 7101 Birch Street (08 001 0006)

The Commerce City site is in a predominantly residential area north of the Denver Central

Business District (CBD) near the Platte River valley downstream from the Denver urban air mass. There

are two schools in addition to the Alsup Elementary school in the immediate vicinity; a middle school and

a high school. There is a large industrial area to the sout h and gravel pits to the west and northwest. This

is a good location to capture particulate matter po llution draining down the Platte River Valley from

downtown Denver and up slope valley flows from the Greeley area. Adams City/Commerce City has

historically shown high PM 10 

## concentrations as well.



# Welby, 3174 E. 78 th 

# Avenue (08 001 3001)

Welby is located 8 miles north-northeast of the Denver CBD on the bank of the South Platte

River; this site is ideally located to measure nighttime drainage of the air mass from the Denver

metropolitan area and the thermally driven, daytime upriver flows. It is located in the up and down river

drainage path of the Denver air mass that has been “c ooking” gives either a warning of the events to come

or the results of the day's exposure. The site serve s as a good drainage location but it may be a target for

deletion or relocation farther down the South Platte River valley from Denver.



# Alamosa - ASC, 208 Edgemont Boulevard (08 003 0001)

This Alamosa site is located on the science build ing of Adams State College in a principally

residential area. The only significant traffic is on US 160 through the center of town. The site is along this

highway but far enough away to reduce impacts on the levels. Meteorological data are not available from

the area. The city has a population of 8,458 (July 20 07 population estimate). This is an increase of 6.2

percent from the 2000 census. The major particulate s ource is wind-blown dust. This site began operation

in 1973 as a TSP monitor and was changed to a PM 10 

## monitor in June 1990.



# Alamosa - Municipal, 425 4 th 

# Street (08 003 0003)

The Alamosa 425 4 th 

## Street was started in May 2002. The site was established closer to the center

of the city to be more representativ e of the population exposure in the area.



# Pagosa Springs, 309 Lewis Street (08 007 0001)

The Pagosa Springs site was located on the roof of the Town Hall from April 24, 2000 through

May 2001. When the Town Hall building was planned to be demolished, the PM 10 

## monitor was relocated

to the Pagosa Springs Middle School and the firs t sample was collected on June 7, 2001.

The Pagosa Springs Middle School site is located next to Highway 160 near the center of town.

Pagosa Springs is a small town spread over a large ar ea. The San Juan River runs through the south side

of town. The town sits in a small bowl like setting with hills all around. A small commercial strip area

along Highway 160 and single-family homes surrounds th is location. It is representative of residential

neighborhood exposure. Pagosa Springs was a PM 10 

## nonattainment area and a SIP was implemented for

this area. PM 10 

## concentrations were exceeded a few ti mes in the late 1980’s. However, the PM 10 

## pollution

was cleaned up through the SIP control me asures and the area has only exceeded the PM 10 

## standard once

since 1994 and that was a regional blowing dust event in March of 1999.

Winds for this area predominantly blow from the north, with secondary winds from the northnorthwest and the south. The predominant wind directions closely follow the valley topography in this

rugged terrain. McCabe Creek, which is very near th e meteorological station that was on the Town Hall

building, runs north south through this area.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 42

# Longmont, 350 Kimbark Street (08 013 0003)

The town of Longmont is a growing, medium sized; Front Range community Longmont is

located between the Denver/Boulder Metro-area and Fo rt Collins. Longmont is both suburban and rural in

nature. The town of Longmont is located approximately 30 miles north of Denver along the St. Vrain

Creek and is about six miles east of the foothills. Longmont is partly a bedroom community for the

Denver-Boulder area. The elevation is 4978 feet. The Front Range peaks rise to an elevation of 14,000

feet just to the west of Longmont. In genera l, the area experiences low relative humidity, light

precipitation and abundant sunshine.

Longmont’s predominant wind direction is from the north through the west due to winds draining

from the St. Vrain Creek Canyon. The PM 10 

## site is near the center of the city near both commercial and

residential areas. This location provides the best available monitoring for population exposure to

particulate matter. The distance and traffic estimat e for the controlling street easily falls into the

neighborhood scale in accordance with federal guide lines found in 40 CFR, Part 58, Appendix D.



# Boulder Chamber of Commerce, 2440 Pearl Street (08 013 0012)

The city of Boulder is located on the eastern edge of the Rocky Mountain foothills. Most of the

city sits on rolling plains. The Boulder PM 2.5 

## site is approximately 7,000 feet east of the base of the Front

Range foothills and about 27.4 feet south of a small branch of Boulder Creek, the major creek that runs

through Boulder.

The predominant wind direction is from the w est with secondary maximum frequencies from the

west-northwest and west-southwest. The distance and traffic estimate for Pearl Street and Folsom Street

falls into the neighborhood scale in accordance with federal guidelines found in 40 CFR, Part 58,

Appendix D.



# Delta, 560 Dodge Street (08 029 0004)

Delta is a small agricultural community mi dway between Grand Junction and Montrose.

Louisiana Pacific's plywood manufacturing facility is only major point source of particulate matter in the

area. The topography in and around Delta is relatively flat as it sits in the broad flat Uncompaghre River

Valley. There are high mesas and mountains surroundi ng this high valley. Delta sits in a large bowl

shaped basin that can effectively trap air pollution especially during persistent temperature inversions.

The Delta County Health Department site was c hosen because it is a one story building near the

downtown area. The site is representative of the large basin with the potential for high PM 10 

## due to

agricultural burning, automobile traffi c and the Louisiana Pacific plant.



# Denver CAMP, 2105 Broadway (08 031 0002)

The City and County of Denver is located approximately 30 miles east of the foothills of the

Rocky Mountains. Denver sits in a basin and the terrain of the city is characterized as gently rolling hills

with the Platte River running from southwest to northeast just west of the downtown area.

Meteorological data gathered at the CAMP monito ring station is inconclusive for evaluation of

the location as a PM 10 

## micro-scale site. The winds are strongly affected by the street canyon effect of the

downtown buildings. Meteorological data shows that winds are predominately from the south, southsouthwest, north and north-northwest. However, due to the downtown location of this site, winds are

shown to flow from almost all directions at similar frequencies. Modeling of the emissions, traffic volume

and history show that the CAMP monitor is well situ ated to be a maximum concentration, micro-scale

site. However, this site represents a location typical of most of the downtown Denver area. This area has

similar land uses, VMT (vehicle miles traveled) and PM 10 

## sources. The Division has shown that the

downtown Denver area and the fringe area surrounding the downtown area is homogeneous and indicates

that the CAMP station is representative of a wider area than just its own micro-scale stetting.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 43

# Denver Visitor Center, 225 W. Colfax Avenue (08 031 0017)

The Denver Visitor Center site is located near the corner of Colfax Avenue and Tremont Street. It

began operation on December 28, 1992. In 1993, this site along with the Denver CAMP and Gates

monitors recorded the firs t exceedances of the 24-hour PM 10 

## standard in the Denver metropolitan area

since 1987. The Visitor Center recorded a PM 10 

## level of 161 μ g/m 3 

## on January 14, 1993. Since then, the

maximum value recorded at the site has been 119 μ g/m 3 

## in 2001. In the past ten years, the 24-Hour

maximum levels have trended downward while the annual average has been relatively flat remaining

around 25 μ g/m 3



## .



# Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter was established as a replacement for the Denver Gates

particulate monitoring site that was located at 1050 S. Broadway about one half mile south-southeast and

on the other side of the South Platte River and I-25 South. The DMAS location represents the core area of

the South Platte drainage in Denver. It has a good mixture of light industrial, residential areas and is

strongly affected by the mobile sources along I-25 as well as South Santa Fe Drive. The openness of the

area also permits the meteorological data to be repr esentative of the larger core Denver area. Finally the

site is on City owned property and will presumably be available for long-term trend analysis. When fully

developed the site will be estab lished as the NCore or National Core site for the Denver Metropolitan

area.



# Colorado College, 130 W. Cache la Poudre Street (08 041 0017)

The Colorado College monitor was established af ter the revised particulate regulations required

that Colorado Springs needed a continuous PM 2.5 

## monitor. The Department elected to collocate the new

PM 2.5 

## monitor with the corresponding filter based monito rs from the RBD site at the Colorado College

location. These monitors began operation in January of 2008.

The nearest representative meteorological site is located at the Colorado Springs Airport. Wind

flows at the Colorado College site are affected by its proximity to Fountain Creek, so light drainage winds

will follow the creek in a north/south direction.



# Cañon City - City Hall, 128 Main Street (08 043 0003)

Cañon City is located 39 miles west of Pueblo. Particulate monitoring began on January 2, 1969

with the operation of a TSP monitor located on the roof of the courthouse building at 7 th 

## Avenue and

Macon Street.

The Cañon City PM 10 

## site began operation in December 1987. On May 6, 1988, the Macon Street

monitor recorded a PM 10 

## concentration of 172 μ g/m 3 

## . This is the only exceedance of either the 24-hour or

annual NAAQS since PM 10 

## monitoring was established at Cañon City. The Macon Street site was

relocated to the City Hall in October of 2004.



# Parachute, 100 E. 2 nd 

# Street (08 045 0005)

The annual average has been trending upward but is still just over one half of the former annual

standard for PM 10 

## which was 50 μ g/m 3



## .



# Rifle - Henry Building, 144 3 rd 

# Street (08 045 0007)

The first Rifle site began operation in June 1985 and ended operation in May 1986. The next site

began operation in December 1987 and continued until 2001. The levels at that site, with the exception of

the March 31, 1999 high wind event were always less than one half of both the annual and the 24-hour

standards. The current location on the Henry Buildi ng began operation in May of 2005 as a part of the

Garfield County study.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 44

# Crested Butte, 603 6 th 

# Street (08 051 0004)

The Crested Butte PM 10 

## site began operation in June 1985. Crested Butte is a high mountain ski

town. The monitor is at the east end of town near the highway and in the central business district. Any

wood burning from the residential area to the west dir ectly affects this location. The physical setting of

the town, near the end of a steep mountain valley, makes wood burning, Street sanding and wintertime

inversions a major concern. The town is attempti ng to regulate the number of wood burning appliances,

since this is a major source of wintertime PM 10 

## . Crested Butte has not reco rded an exceedance of the

NAAQS since it began monitoring.



# Mt. Crested Butte, 19 Emmons Road (08 051 0007)

Mount Crested Butte is located at an elevation of 8,940 feet (2,725 m) at the base of the Crested

Butte Mountain Resort ski area. Mount Crested Butte is a unique location for high particulate matter

concentrations because it is located on the side of a mountain (Crested Butte 12,162 ft. or 3,707 m), not in

a bowl, valley, or other topographic feature that would normally trap air pollutants. There is not a

representative meteorological station in or near Mt. Crested Butte.

The location for the Mt. Crested Butte site was selected because it had an existing PM 10 

## site that

had several high PM 10 

## concentrations including five exceedances of the 24-hour standard in 1997 and one

in 1998. Mt. Crested Butte also exceeded the PM 10 

## annual average standard in 1997. A CMB source

apportionment from 10 PM 10 

## filters identified crustal material as the mostly likely source (91 percent) of

PM 10 

## . Carbon, which is most likely from residential w oodsmoke, made up 8 percent of the statistically

composite sample and secondary species made up the re maining 1 percent. The Mt. Crested Butte site

was also selected because it is an area repr esentative of the residential impact of PM 2.5



## .



# Durango - River City Hall, 1235 Camino del Rio (08 067 0004)

Durango is the second largest city on the western sl ope. The town is situated in the Animas River

Valley in southwestern Colorado. Its elevation is a pproximately 6,500 feet (1981 meters) above mean sea

level. The Animas valley through Durango is steep and narrow. Even though little meteorological

information is available for the area, the microclima te of Colorado mountain communities is characterized

by cold air subsidence, or drainage flows during the evening and early morning hours and up valley flows

during afternoon and early evening hours when solar heating is highest. Temperature inversions that trap

air pollutants near the surface are common during night and early morning hours.



# Fort Collins - CSU, 251 Edison Street (08 069 0009)

Fort Collins does not have the population to re quire a particulate monitor under Federal

regulation. However, it is one of the largest cities along the Front Range.



# Grand Junction - Powell, 650 South Avenue (08 077 0017)

Grand Junction is the largest city on the western slope in the broad valley of the Colorado River.

The monitors are on county owned buildings in the south side of the city. The site is on the southern end

of the central business district and close to the indust rial area along the train tracks. It is about a half a

mile north of the river and about a quarter mile east of the railroad yard. This site monitors 24-hour and

hourly PM 10 

## as well as for 24-hour and hourly PM 2.5 

## and PM 2.5 

## Speciation.



# Grand Junction - Pitkin, 6451⁄4 Pitkin Avenue (08 077 0018)

This location monitors carbon monoxide, wind sp eed, wind direction, temperature and hourly

PM 10 

## . It is located at the northern edge of a low usage parking lot near the Powell monitor.



# Clifton, Hwy 141 & D Road (08 077 0019)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 45 

## The Clifton monitor is located in the town of Clifton which is a southeastern suburb of Grand

Junction, Colorado. The monitor is in a low usage park ing lot operated by the sanitation district. It is one

## half mile north of the Colorado River. The site wa s established at the request of the Mesa County Health

Department to address concerns of the oil and gas development in the area.

The monitor began operations in October 2007 and operates on an every third day schedule.



# Aspen - Library, 120 Mill Street (08 097 0006)

Aspen is at the upper end of a steep mountain va lley. The major difference is that Aspen does not

have an interstate running through it. As pen was classified as nonattainment for PM 10 

## but it is now under

an attainment/maintenance plan. The valley is more re stricted at the lower end and thus forms a tighter

trap for pollutants in the valley. The transient population due to winter skiing and summer mountain

activities greatly increases the population and traffic during these seasons. There is also a large down

valley population that commutes to work each day from as far away as the Glenwood Springs area 41

miles to the northeast.

There have been several particulate monitors in the Aspen area. Only three have not been shortterm special studies. The first PM 10 

## monitor began operation in June 1985. The next, the Sport Stalker,

was chosen after an intense effort involving EPA, Stat e and local agency personnel. The need was to find

an acceptable middle or middle scale location.



# Lamar Power Plant, 100 2 nd 

# Street (08 099 0001)

Lamar is one of the largest cities on the eastern pl ains. Particulate monitoring in Lamar began in

August 1975 with the installation of a TSP site at the Lamar power plant at 100 2 nd 

## Street. It operated as a

TSP site until August of 1986. The first Lamar PM 10 

## site began operation in June 1985 at the power plant.

In August 1986, the monitoring site was m oved to the Municipal Complex (08 099 0002).

On March 19, 1976, the Lamar power plant monitor recorded a TSP of 1,033 μ g/m 3 

## . This is the

fourth highest particulate concentration ever repor ted in Colorado. Lamar has regularly recorded its

highest TSP and PM 10 

## levels in March. Between 1975 and 198 6 the power plant monitor reported 25

concentrations greater than the 24-hour TSP NAAQS of 260 μ g/m 3 

## , twelve of these occurred in March,

no other month had more than three. Three of the seven exceedances of the 24-hour PM 10 

## NAAQS have

also occurred in March. The primary reason for this relationship is due to the combination of low

humidity and high winds that are common during the month of March. Lamar is the only Colorado city

east of Denver to have been designated as a PM 10 

## nonattainment area and is now under an

attainment/maintenance plan. In 1992, the Division re instated the power plant location as well. This was

done after a review showed that levels at the power plant were generally higher than those at the City

Complex. As a part of the SIP for Lamar, a mete orological site was established in 1992 at the city

complex location. Analysis of these data was included as a part of the SIP process.



# Lamar - Municipal Building, 104 Parmenter Street (08 099 0002)

The Lamar Municipal site was established in January of 1996 as a more population oriented

location than the Power Plant. The Power Plant site is located on the northern edge of town while the

Municipal site is near the center of the town. Bo th sites have recorded exceedances of the 24-hour

standard of 150 μ g/m 3 

## and both sites regularly record values above 100 μ g/m 3 

## as a 24-hour average.



# Pueblo - Public Works, 211 E. D Street (08 101 0012)

Pueblo is the third largest city in the state, not counting communities that are part of Metropolitan

Denver. Pueblo is principally characterized by rolling plains and moderate slopes with elevations ranging

from 4,474 ft to 4,814 ft (1,364 to 1,467 m). The Roc ky Mountain Front Range is about 25 miles (40 km)

west and the sight of Pikes Peak is easily visible on a clear day.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 46 

## Meteorologically, Pueblo can be described as havi ng mild weather with an average of about 300

days of sunshine per year. Gene rally, wind blows up valley from the southeast during the day and down

valley from the west at night. Pueblo experiences av erage wind speed ranges from 7 miles per hour in the

fall and early winter to 11 miles per hour in the spring.

## The site is located on the roof of the Public Works Building at 211 E. D St., in a relatively flat

area found two blocks northeast of the Arkansas Rive r. It is also located near Fountain Creek. The

distance and traffic estimate for Main Street and surrounding streets easily falls into the middle scale in

accordance with federal guidelines found in 40 CFR, Part 58, Appendix D.

The Division is in the process of finding a loca tion for the Pueblo monitors since a new tall

building is under construction adjacent to the monitors.



# Steamboat Springs, 136 6 th 

# Street (08 107 0003)

Like other ski towns, Steamboat Springs has probl ems with wintertime inversions, high traffic

density, wood smoke and street sand. These problems are exacerbated by temperature inversions that trap

the pollution in the valleys.

The first site began operation in Steamboat Spri ngs in June 1985 at 929 Lincoln Avenue. It was

moved to the current location in October 1986. The 136 6 th 

## Street location not only provides a good

indication of population exposure, since it is more centrally located, but it has better accessibility than the

previous location.



# Telluride, 333 W. Colorado Avenue (08 117 0002)

Telluride is a high mountain ski town in a narrow box end valley. The San Miguel River runs

through the south end of town and the town is only about 1⁄2 mile wide from north to south. The

topography of this mountain valley regime creates temp erature inversions that can last for several days

during the winter. Temperature inversions can trap ai r pollution close to the ground. Telluride sits in a

valley that trends mainly east to west, which can trap air pollutants more effectively since the prevailing

winds in this latitude are the westerly and the San Miguel River Valley is closed off on the east end.



# Breckenridge - 501 N. Park Avenue (08 119 0002)

The City of Breckenridge is located in the valley of the Blue River. It is a tourist center with

skiing in the winter and numerous summertime f estivals and activities. The resulting woodsmoke and

traffic caused sufficient concern that the city of Breckenridge requested that the Division establish PM 10 

## monitoring in the area. The Breckenridge site began operation in April 1992 and it recorded exceedances

of the level of the 24-hour standard in both 2000 and in 2005. The site is currently operating on an every

third day sampling schedule.



# Greeley - Hospital, 1516 Ho spital Road (08 123 0006)

Winds in this area are primarily out of the nor thwest; with dominant wind speeds less than 3.1

m/s. Secondary winds are from the north, north-northwest and east-southeast, with the most frequent wind

speeds also being less than 3.1 m/s. The most recent available wind data for this station is for the period

December 1986 to November 1987. Predominant residen tial growth patterns are to the west and north

with large industrial growth expected to the west. There are two feedlots located about 11 miles east of

the town. There was a closer feedlot on the east edge of town, but it was moved in early 1999, after the

town of Greeley purchased the land in 1997.

The Greeley PM 10 

## monitor is on the roof of a hospital office building at 1516 Hospital Road.

Greeley Central High School is located immediately to the east of the monitoring site. Overall, this is in

an area of mixed residential and commercial de velopment that makes it a good population exposure,

neighborhood scale monitor. The distance and traffic estimate for the most controlling street easily falls

into the neighborhood scale in accordance with federal guidelines found in 40 CFR, Part 58.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 47

# Appendix G - PM 2.5 

# Site Descriptions

Commerce City, 7101 Birch Street (08 001 0006)

The Commerce City site is in a predominantly residential area north of the Denver Central

Business District (CBD) near the Platte River valley downstream from the Denver urban air mass. There

are two schools in addition to the Alsup Elementary School in the immediate vicinity, a middle school to

the north and a high school to the southeast. There is a large industrial area to the south and gravel pits to

the west and northwest. This is a good location to capture particulate matter pollution draining down the

Platte River Valley from downtown Denver and up sl ope valley flows from the Greeley area. The old

Adams City/Commerce City site, which was about 18 0 meters north of the Alsup Elementary School,

recorded high PM 10 

## concentrations as well.



# Arapahoe Community College, 6190 S. Santa Fe Drive (08 005 0005)

The ACC site is located in south suburban metropo litan Denver. It is located on the south side of

the Arapahoe Community College in a distant parking lot. The site is n ear the bottom of the Platte River

Valley along Santa Fe Drive (Hwy. 85) in the city of Littleton. It is also near the city of Englewood.

There is a large residential area located to the east across the railroad and Light Rail tracks. The PM 2.5 

## monitor is located on a mobile shelter in the rarely used South parking lot. Located at 6190 S. Santa Fe

Drive, this small trailer is close to the Platte River and the monitor has excellent 360 0 

## exposure. Based on

the topography and meteorology of the area ACC is in an area where PM 2.5 

## emissions may collect. This

location may capture high concentrations during periods of upslope flow and temperature inversion in the

valley. However, since it is further south in a mo re sparsely populated area than the Broadway-CAMP

site, the concentrations are usuall y not as high as other Denver locations.

Winds are predominately out of the south-southw est and south, with secondary winds out of the

north and north-northeast (upslope). Observed di stances and traffic estimates easily fall into the

neighborhood scale in accordance with federal guidelines found in the 40 CFR, Part 58, Appendix D. The

site meets all other neighborhood scale criteria.



# Longmont, 350 Kimbark Street (08 013 0003)

The town of Longmont, located in Boulder County, is a growing, medium sized, Front Range

community. It is located approximately 30 miles north of Denver along the St. Vrain Creek and is about

six miles east of the foothills. Longmont is par tly a bedroom community for the Denver-Boulder area.

The elevation is 4,978 feet. The Front Range peaks rise to an elevation of 14,000 feet just to the west of

Longmont. In general, the area experiences low rela tive humidity, light precipitation and abundant

sunshine

Longmont’s predominant wind direction is from the north through the west due to winds draining

from the St. Vrain Creek Canyon. The PM 2.5 

## site is near the center of the city near both commercial and

residential areas. This location provides the best available monitoring for population exposure to

particulate matter. The distance and traffic estimate fo r the AADT controlling street easily falls into the

neighborhood scale in accordance with federal guide lines found in 40 CFR, Part 58, Appendix D.



# Boulder Chamber of Commerce, 2440 Pearl Street (08 013 0012)

The city of Boulder is located on the eastern edge of the Rocky Mountain foothills. Most of the

city sits on rolling plains. The Boulder PM 2.5 

## site is approximately 7,000 feet (2.13 km) east of the base of

the Front Range foothills and about 27.4 feet (8.35 m) south of a small branch of Boulder Creek, the

major creek that runs through Boulder.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 48 

## The predominant wind direction is from the w est with secondary maximum frequencies from the

west-northwest and west-southwest. The distance and traffic estimate for Pearl Street and Folsom Street

falls into the neighborhood scale in accordance with federal guidelines found in 40 CFR, Part 58,

## Appendix D. Thus, the Boulder Chamber of Commerce PM 2.5 

## site is representati ve of a neighborhood

scale area and meets all other neighborhood scale criteria.



# Boulder - CU/Athens, 2102 At hens Street (08 013 1001)

The Boulder - CU site is located at the edge of a low usage parking lot to the north and the

football practice field to the south. This lo cation provides a good neighborhood representation for

particulates. This site will be removed in 2009 du e to construction of a new domed practice field.



# Denver CAMP, 2105 Broadway (08 031 0002)

The City and County of Denver is located approximately 30 miles east of the foothills of the

Rocky Mountains. Denver sits in a basin and the terrain of the city is characterized as gently rolling hills

with the Platte River running from southwest to northeast just west of the downtown area.

Meteorological data gathered at the CAMP monito ring station is inconclusive for evaluation of

the location as a PM 2.5 

## micro-scale site. The winds are strongly affected by the street canyon effect of the

downtown buildings. Meteorological data shows that winds are predominately from the south, southsouthwest, north and north-northwest. However, due to the downtown location of this site, winds are

shown to flow from almost all directions at similar frequencies. Modeling of the emissions, traffic volume

and history show that the CAMP monitor is well situ ated to be a maximum concentration, micro-scale

site. However, this site represents a location typical of most of the downtown Denver area. This area has

similar land uses, VMT (vehicle miles traveled) and PM 2.5 

## sources. The Division has shown that the

downtown Denver area and the fringe area surrounding the downtown area is homogeneous and indicates

that the CAMP station is representative of a wider area than just its own micro-scale area.



# Denver NJH-E, 14 th 

# Avenue & Albion Street (08 031 0013)

This site is located three miles east of the Denver CBD, close to one of the busiest intersections in

Denver (Colorado Boulevard and Colfax Avenue). The current site began operations in 1982. Two

previous sites were located just west of the curre nt location. The first operated for only a few months

before it was moved to a new and “temporary” site in th e corner of the laboratory building at the corner of

Colorado Boulevard and Colfax Avenue.



# Denver - Swansea, 4650 Columbine Street (08 031 0023)

The Swansea Elementary school site was established as a part of the toxicological study

associated with the ASARCO Study conducted by th e Colorado Department of Public Health and

Environment.



# Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter was established as a replacement for the Denver Gates

monitor that was located at 1050 S. Broadway about one half mile south-southe ast and on the other side

of the South Platte River and I-25 South. The DMAS location represents the core area of the South Platte

drainage in Denver. It has a good mixture of light industrial, residential areas and is strongly affected by

the mobile sources along I-25 as well as South Santa Fe Drive. The openness of the area also permits the

meteorological data to be representative of the larger core Denver area. Finally the site is on City owned

property and will presumably be available for long-term trend analysis. When full y developed the site will

be established as the NCore site for the Denver Metropolitan area.



# Chatfield Reservoir, 11500 N. Roxborough Park Road (08 035 0004)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 49 

## The Chatfield Reservoir location was establishe d as the result of the 1993 Summer Ozone Study.

The site is located on the south side of Chatfiel d Reservoir at the campground registration building. This

location was selected over the Corps of Engineers Vis itor Center across the reservoir because it was more

## removed from the influence of traffic along C-470. Lo cated in the South Platte River drainage, this

location is well suited for monitoring southwesterly PM 2.5 

## particulates in the Denver metro area.



# Elbert County, 24950 Ben Kelly Road (08 039 0001)

The Elbert County site is believed to be a good location to measure urban background

concentrations of PM 2.5 

## . Winter winds at Elbert are from the southwest to southeast at 4-5 m/s during the

morning hours. During the afternoon hours, brisk wind s are generally from the south-southwest to the

southeast. This shows that the Denver Metropolitan Area does not influence the winds moving across the

monitoring site. A July 1981 analyses of surface st reamline was done to study summer wind patterns in

this same area. The study shows that in the later morning hours (0800), winds predominately blow from

the north and northeast, placing the Denver Metro-Area upwind of the site. Although, during the early

morning hours, wind flows off the Cheyenne Ridge and Pa lmer Lake Divide into the river basins to the

north and south, away from the Elbert County monitoring site. By early afternoon (1100) and continuing

through later afternoon (1400), up slope flow occurs over nearly the entire region, bringing clean air from

the east and northeast to the site. By the evening hours, winds again predominately flow from the

mountain region, with these westerly winds again flowing off the Palmer Lake Divide, away from the

monitoring site. This would suggest that the Elbert Co unty site is a very clean location for winter months

and for early morning, afternoon and evening hours during the summer months.

The location of this Elbert County site classifi es it as an urban background site, in accordance

with federal guidelines found in 40 CFR, Part 58, Ap pendix D. The site meets all guidelines for the urban

background site.



# Colorado College, 130 W. Cache la Poudre Street (08 041 0017)

The Colorado College monitor was established af ter the revised particulate regulations required

that Colorado Springs needed a continuous PM 2.5 

## monitor. The Department elected to collocate the new

PM 2.5 

## monitor with the corresponding filter based monito rs from the RBD site at the Colorado College

location. These monitors began operation in January of 2008.

The nearest representative meteorological site is located at the Colorado Springs Airport. Wind

flows at the Colorado College site are affected by its proximity to Fountain Creek, so light drainage winds

will follow the creek in a north/south direction.



# Fort Collins - CSU, 251 Edison Street (08 069 0009)

Fort Collins does not have the population to re quire a particulate monitor under Federal

regulation. However, it is one of the largest cities along the Front Range.



# Grand Junction - Powell, 650 South Avenue (08 077 0017)

Grand Junction is the largest city on the western slope in the broad valley of the Colorado River.

The monitors are on county owned buildings in the south side of the city. The site is on the southern end

of the central business district and close to the indust rial area along the train tracks. It is about a half a

mile north of the river and about a quarter mile east of the railroad yard. This site monitors 24-hour and

hourly PM 10 

## as well as for 24-hour and hourly PM 2.5 

## and PM 2.5 

## Speciation.



# Pueblo - Public Works, 211 S. D Street (08 101 0012)

Not counting communities that are part of Metropolita n Denver, Pueblo is the third largest city in

the state. Pueblo is principally ch aracterized by rolling plains and moderate slopes with elevations ranging

from 4,474 ft to 4,814 ft. The Rocky Mountain Front Range is about 25 miles west and the sight of Pikes

Peak is easily visible on a clear day.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 50 

## Meteorologically, Pueblo can be described as havi ng mild weather with an average of about 300

days of sunshine per year. Gene rally, wind blows up valley from the southeast during the day and down

## valley from the west at night. Pueblo experiences av erage wind speed ranges from 7 miles per hour in the

fall and early winter to 11 miles per hour in the spring.

The site is located on the roof of the Public Works Building at 211 S. D St., in a relatively flat

area found two blocks northeast of the Arkansas Rive r. It is also located near Fountain Creek. The

distance and traffic estimate for Main Street and su rrounding streets easily falls into the neighborhood

scale in accordance with federal guidelines found in 40 CFR, Part 58, Appendix D.

The Division is in the process of finding a loca tion for the Pueblo monitors since a new tall

building is under construction adjacent to the monitors.



# Greeley - Hospital, 1516 Ho spital Road (08 123 0006)

The current Greeley site has been in operation since 1982.

Winds in this area are primarily out of the nor thwest; with dominant wind speeds less than 3.1

m/s. Secondary winds are from the north, north-northwest and east-southeast, with the most frequent wind

speeds also being less than 3.1 m/s. The most recent available wind data for this station is for the period

December 1986 to November 1987. Predominate residen tial growth patterns are to the west and north

with large industrial growth expected to the west. There are two feedlots located about 11 miles east of

the town. There was a closer feedlot on the east edge of town, but it was moved at the first of 1999, after

the town of Greeley purchased the land in 1997.

The Greeley PM 2.5 

## monitor is on the roof of a hospital office building at 1516 Hospital Road.

Greeley Central High School is located immediately to the east of the monitoring site. Overall, this is in

an area of mixed residential and commercial de velopment that makes it a good population exposure,

neighborhood scale monitor. The distance and traffic estimate for the most controlling street easily falls

into the neighborhood scale in accordance with federa l guidelines found in 40 CFR, Part 58, Appendix D.



# Platteville, 1004 Main Street (08 123 0008)

Platteville is located immediately west of Highw ay 85 along the Platte River valley bottom four

miles east of I 25, at an elevation of 4,825 feet. Th e area is characterized by relatively flat terrain and is

located about one mile east of the South Platte. The National Oceanic and Atmospheric Administration

operated the PROFS (Prototype Regional Observational Forecasting System) Mesonet network of

meteorological monitors from the early 1980's through the mid 1990's in the northern Colorado Front

Range area. Based on this data, the area around Platteville is one of the last places in the wintertime that

the cold pool of air that is formed by temperature i nversions burns off. This is due to solar heating. The

upslope/downslope Platte River Valley drainage and wind flows be tween Denver and Greeley make

Platteville a good place to monitor PM 2.5 

## . These characteristics also make it an ideal location for chemical

speciation sampling, which began at the end of 2001.

The Platteville site is located at 1004 Main St reet at the South Valley Middle School, located on

the south side of town on Main Street. The school is a one-story building and it has a roof hatch from a

locked interior room providing easy access to its large flat roof. There is a 2-story gym attached to the

building approximately 28 meters to the Northwest of the monitor. The location of the Platteville monitor

easily falls into the regional transport scale in accord ance with federal guidelines found in 40 CFR, Part

58, Appendix D.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 51

# Appendix H - TSP/Lead Site Descriptions

Denver Municipal Animal Shelter, 678 S. Jason Street (08 031 0025)

The Denver Municipal Animal Shelter was established as a replacement for the Denver Gates

particulate monitor that was located at 1050 S. Broadw ay about one half mile south-southeast and on the

other side of the South Platte River and I-25 South. The DMAS location represents the core area of the

South Platte drainage in Denver. It has a good mixture of light industrial, residential areas and is strongly

affected by the mobile sources along I-25 as well as South Santa Fe Drive. The openness of the area also

permits the meteorological data to be representative of the larger core Denver area. Finally the site is on

city owned property and will presuma bly be available for long-term trend analysis. When the Denver

Municipal Animal Shelter location is fully develope d it will be established as the NCore site for the

Denver Metropolitan area.

Until the establishment of the new lead standard in November 2008, this monitor served as the

CFR required regional lead site.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 52

# Appendix I - National Core (NCore) Monitoring Station

The Colorado Department of Public Health a nd Environment, Air Pollution Control Division’s

NCore monitoring station is located on the Denver Municipal Animal Shelter (DMAS) lot at 678 S. Jason

Street in Denver, Colorado. This location is in the Denver-Boulder Region with its projected population

for 2008 of 2.845 million. This is a projected increase of 1.6 percent from the 2000 census. The site is

located approximately 4 miles directly south of the Denver CBD along the South Platte River. This

location was established as the NCore site in conjunc tion with EPA Region VIII and the City and County

of Denver.

The DMAS site was also cho sen because it represented a better neighborhood scale for carbon

monoxide, ozone and particulate matter. The site also had enough space available for the number of

samplers required for an NCore monitoring site. Its location along the South Platte River provides

maximum exposure to the up and down-valley pollution ca rried by the diurnal winds. This last point is

supported by the wind rose. The wind rose has data only for seven months but the trend is evident.

Area of Representativeness

40 CFR Part 58 Appendix provides design criteria for ambient air quality monitoring. The

monitoring objective for the NCore site is to produce data that represents a fairly large area and therefore

the spatial scale of the site is important. The special s cale defines the physical dimensions of the air parcel

nearest to the monitoring site throughout which actua l pollutant concentrations are similar. It is

determined by the characteristics of the area surrounding the air monitoring site and the site’s distance

from nearby air pollution sources such as roadways, fact ories, etc. In the case of urban NCore the special

scales to be used are neighborhood and urban. The following table shows the area of representativeness

for each pollutant for the DMAS site.

Table 14 - Parameters and Scale for the Denver Municipal Animal Shelter

AQS # Site Name Address Started Ended Latitude Longitude Elevation

08 031 0025 Denver Municipal

Animal Shelter 678 S. Jason St. 07/2005 39.704005 -104.998113 1,594



### Parameter POC Started Orient/Scale Monitor Type Sample

CO 1 05/2009 P.O. Neigh Thermo 48C-TLE NCore Continuous

SO 2 1 05/2008 P.O. Neigh Ecotech 9850T NCore Continuous

NO Y +

O 3 1 04/2008 Neigh/Urban API 400A NCore Continuous

WS/WD/Temp (U) 1 07/2008 P.O. Neigh Met - One NCore Continuous

Relative Humidity 1 + Rotronic NCore Continuous

Barometric Pressure 1 + NCore Continuous

Solar Radiation 1 + NCore Continuous

Precipitation 1 + NCore Continuous

Temp (L) 1 07/2008 P.O. Neigh Met - One NCore Continuous

TSP 1 07/2005 P.O. Neigh TSP SLAMS 1/6

TSP 2 07/2005 P.O. Neigh TSP SLAMS 1/6

Pb 1 07/2005 P.O. Neigh TSP SLAMS 1/6

Pb 2 07/2005 P.O. Neigh TSP SLAMS 1/6

PM 10 1 07/2005 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 10 2 07/2005 P.O. Neigh SA/GMW-1200 SLAMS 1/6

PM 10 3 08/2005 P.O. Neigh TEOM-1400ab SLAMS Continuous

PM 2.5 1 10/2007 P.O. Neigh Partisol 2025 NCore 1/6

PM 2.5 3 10/2007 P.O. Neigh TEOM FDMS SPM Continuous

PM 2.5 Speciation + NCore 1/6

+ - Indicates that these parameters have not begun operat ion at this time but are scheduled to begin in 2010.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 53 

## The neighborhood scale is set to represent an area up to 4 km in diameter form the site. In the

case of the DMAS site this represents an area from the state capitol on the north almost to Colfax

## Boulevard and Alameda Avenue on the east. The sout hern end of the neighborhood scale area is Yale

Avenue and Santa Fe Drive. The western boundary is almost to Alameda Avenue and Sheridan

Boulevard. This area is a mix of residential, comme rcial and light industry and contains 28 schools, two

hospitals and three clinics. The Xcel Energy’s Zuni Power Plant is located 4 km north-northwest of the

DMAS site along the South Platte River and the Ar apahoe Power Plant is 3.7 km to the south.

The urban scale of up to 50 km encompasses all of the Denver Metro Area and stretches from

Longmont on the north to below Castle Rock on th e south and from Bennett on the east to Idaho Springs

on the west. The western scale boundary is more reasona bly restricted to the edge of the foothill near

Golden.

Traffic in the immediate area around the site is limited as shown in the following table.

Table 15 - Traffic Information for the Denver Municipal Shelter

Distance to

the nearest

roadway Direction Daily Traffic

Estimates Year of Traffic

Estimates Type of

Roadway Comments

58 meters North/East <2000 2008 6-local Estimates only

East

South

91 meters West <2000 2008 6-local Estimates only

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 54

# Denver Municipal Animal Shelter Site Photos

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 55

# Denver Municipal Animal Shelter (4 Km Radius)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 56

# Denver Municipal Animal Shelter (50 Km Radius)

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 57

## Wind Speed and direction measurements at the DM AS site began in July 2008. The rest of the

suite of meteorological measurements are scheduled to begin operation in 2009 but the equipment has not

been purchased. The following wind roses show the data from July 2008 through January 2009.

Wind Rose July 2008 - January 2009 - All Hours

Wind Rose July 2008 – January 2009 - AM Hours / Wind Rose July 2008 – January 2009 - PM Hours

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 58

# Drawings of Denver Municipal Animal Shelter Site layout

.

Colorado Air Monitoring Network Plan – 2009 - 2010 

## 59Colorado Air Monitoring Network Plan – 2009 - 2010 

## 60