# Air Monitoring Network Plan 2013

NCUAQMD

2300 Myrtle Ave

Eureka, CA 95501Page 2 of 27



# Table of Contents

Definition of Terms 3 0



## Executive Summar y 4



## Overview of Network Operation 5

Network Design 5

Maps of monitor ing Station Locations 6

Minimum m onitoring Requirements 11

Ozone 11

PM2.5 12

PM10 13

NO2 14

SO2 14

CO 15

Pb 15

Quality Control 16

Collocation 16

Recent or Proposed Ch anges to Network 16

Review of Changes to PM2.5 monitoring Network 16

Data Sub mission Requirements 17

Data Availability 1 7

Detailed Site Information 18

Jacobs 18

Eu reka Ist 20

Humboldt Hill 22

Wea verville 24

Cres cent City 26



## Signature 27Page 3 of 27 

# Definition of Terms

AAC: Atmospheric A nalysis and Consulting

AQS: Air Quality System

BAAQMD: Bay Area Air Quality Management District

C ARB: California Air Resources Board

E

- BAM: Emergency Beta

- Attenuation Monitor

FEM: Federal Equivalency Method

FRM: Federal Reference Method

MSA: Micropolitian Statis tical Area

NAAQS: National Ambient Air Quality Standards

NOAA: National Oceanographic and Atmospheric Administration

NCUAQMD: North Coast Unified Air Quality Management District

POC: Parameter Occurrence Code

PQAO: Primary Quality Assurance Organization

SIP: State Implementation Plan

SLAMS: Sta te and Local Air Monitoring Station

SPM: Special Purpose MonitorPage 4 of 27 

# Executive Summary

The North Coast Unified Air Quality Management District (NCUAQMD) maintains a

network of air pollution monit oring equipment. This network has developed slowly,

beginning in 1986 with a solitary PM10 monitoring station. Currently there are five

stations in operation

.

The NCUAQMD is located in the far northwestern portion of California. It is comprised

of three c ounties: Humboldt, Del Norte, and Trinity, which together cover 7,753 square

miles. It is bordered on the west by the Pacific Ocean and extends from the Oregon

Border south approximately 140 miles to the Mendocino County line. Eureka, the

county seat of Hu mboldt County, is 284 miles north of San Francisco, 466 miles south

of Portland, Oregon and on the coast of the Pacific Ocean. The area is made up of

varied terrain, from coastal wetlands to rugged mountains. Inversions and diurnal

offshore wind patterns a re common.

Major sources located in the Humboldt Bay region (Eureka, Arcata) i nclude the

Fairhaven Power Plant, and PG&E's Humbold t Bay Power Plant. The first source is

located on the Samoa Peninsula just east of Eureka. The PG& E plant is located just

south of Eureka.

In addition to these Title 5 sources, the NCUAQMD is impacted by mobile and large

industrial sources. The District is also impacted by wood smoke in the winter and

agricultural crop residue burnin g and wild fires i n the summer.Page 5 of 27



# Overview of Network Operation

Network Design

.

The North Coast Unified Air Quality Management District ope rated 5 monitoring sites in

2012 . The following maps show the locations of the monitoring sites. Tables 1 and 2

list the pollutants measured at each site.

Table 1. List of Special Purpose Monitoring Sites

Site Name AQS Site # Pollutant Monitored

Jacobs 060231004 PM 10 

### , PM 2.5 

### , O 3 

### , NO 2 

### , CO, SO 2



### Humboldt Hill 060231005 PM 10 

### , PM 2.5 

### , O 3 

### , NO 2 

### , CO, SO 2

, 

### NH 3



### Weaverville 061050002 PM 2.5



### Table 2. List of State and Local Air Monitoring Sites

Site Name AQS Site # Pollutants Monitored

Eureka Ist 060231002 PM 10 

### , PM 2.5



### Weaverville 061050002 PM 10 

### Crescent City 060150006 PM 10Page 6 of 27



# Monitoring Station Locations

Jacobs Monitoring Station (717 South Ave , Eureka, Humboldt County )Page 7 of 27 

### Eureka Ist Monitoring Station (529 I Street, Eureka, Humboldt County )Page 8 of 27



### Humboldt Hill Monitoring Station (7333 Humboldt H ill Rd

. , Eureka, Humboldt County )Page 9 of 27



### Crescent City Monitoring Station

, (880 Northcrest Dr. , Crescent City, Del Norte County )Page 10 of 27



### Weaverville Monitoring Station , ( 11 Court Street , Weaverville, Trinity County )Page 11 of 27



# Minimum Monitoring Requirements

This network meets the minimum monitoring requirements for all criteria pollutants

(Tables 3

- 11 ).



## Ozone

Table 3. Minimum Monitoring Requirements for Ozone.

Micropolitian

Statistical

Area County Pop. In

Year

2010 4th

highest 8

-

hour max.

(ppm)

(2010

-

2012 ) 

### 3 year

design

value SLAMS

Monitors

Required Active

SLAMS

Monitors Active

SPM

Monitors Monitors

Needed

Eureka

Arcata

Fortuna Humboldt 134,623 Jacobs

0.047 

### Jacobs

0.045

0 0 2 0

Humboldt

Hill*

0.046 Humboldt

Hill*

0.043

Crescent

City Del Norte 28,610

- 

### - 0 0 0 0

none Trinity 13,786

- 

### - 0 0 0 0



### * Humboldt Hill data calculated using only 2011 and 2012

No monitors are required for either a SIP or M aintenance Plan. The NCUAQMD

monitors Ozone as an examination of population exposure levels.Page 12 of 27



## PM 2.5

Table 4. Minimum Monitoring Requirements for FRM PM 2.5



### .

Table 5. Minimum Monitoring Requirements for Continuous PM 2.5 

### monitors.

Micropolitian

Statistical

Area County Pop. In Year

2010 SLAMS FEM

monitors required SLAMS Monitors

Active SPM Monitors

Active

Eureka, Arcata,

Fortuna Humboldt 134,623 0 0 1 *

Crescent City Del Norte 28,610 0 0 0

none Trinity 13,786 0 0 1 *



### * Non

- Regulatory instruments

Table 6. Collocation of continuous PM2.5 monitors

Method Code # Primary

Monitors Required

Collocated

monitors Active

Collocated FRM

monitors Active Collocated

FEM Monitors

195 0 0 0 0



### No PM2.5 monitors are required for either a SIP or Maintenance Plan. Micropolitian

Statistical

Area County Pop. In

Year

2010 Annual

Design

Value

( u g/m 3 

### )

(2010

- 2012) Daily

Design

Value

( u g/m 3 

### )

(2010

- 2012) FRM

Monitors

Required SLAMS

Monitors

Active SPM

Monitors

Active Monitors

Needed

Eureka,

Arcata,

Fortuna Humboldt 134,623 I street

5.7 I street

16.7

0 1 

### 1 0

Jacobs

6.0 Jacobs



### 19.5

Crescent City Del Norte 28,610



### - - 0 0 0 0

none Trinity 13,786



### - - 0 0 0 0Page 13 of 27



### The NCUAQMD participates in the Federal Fine Particulates m onitoring program by

operating instruments at the Eur eka Ist, Jacobs and Weaverville station s . The

NCUAQMD monitor s PM 2.5 

### with FRM inst ruments at the Ja cobs and Ist sites. Both of

these instruments are suitable for national comparison

. FEM PM 2



### . 5 

### monitor s are located

at the Weaverville and Humboldt Hill Stations. These instruments are non

- regulatory

and their data is not expected to meet the FRM similarity requirements which would

enable them to be used for in national comparison. Collocation is not required as they

are Special Purpose Monitors.



## PM10

Table 7 . Minimum Monitoring Requirements for PM 10



### .

Micropolitian

Statistical

Area County Population

in Year

2010 Max

Concentration

(2010

- 2012 )

( u g/m 3 ) SLAMS

Monitors

Required SLAMS

Monitors

Active SPM

Monitors

Active Monitors

Needed



### Eureka,

Arcata,

Fortuna Humboldt 134,623 I street

64

0 1 2 0 Jacobs

49

Humboldt Hill*

28

Crescent City Del Norte 28,610 61 0 1 0 0

none Trinity 13,786 41 0 1 0 0



### * Humboldt Hill data calculated using only 2012 data

NCU AQMD is non

- attainment for the S tate PM 10 

### standard in all three counties.Page 14 of 27



## NO 2

Table 8

. Minimum Monitoring Requirements for NO 2



### .

Micropolitian

Statistical

Area County Pop. in

Year

2010 Annu al Design

Value (ppb)

(2010

- 2012 ) SLAMS

Monitors

Required Active

SLAMS

Monitors Active

SPM

Monitors Monitors

Needed

Eureka

Arcata,

Fortuna Humboldt 134,623 Jacobs

2.77 0 0 2 0

Humboldt Hill

0.77

Crescent City Del Norte 28,610

- 0 0 0 0

none Trinity 13,786

- 0 0 0 0



### No monitors are required for SIP or Maintenance Plans. NCUAQMD monitors NO 2 

### in

Humboldt County to examine population exposure

. Based on population, no near

- road

NO2 monitors are required within the NCUAQMD boundaries.



## SO2

Table 9 . Minimum Monitoring Requirements for SO 2



### .

Micro

politian

Statistical

Area County Pop. in

Year

2010 Annu al

Design

Value

(ppb)

(2010

-

2012 ) Max 24

h our

(ppb)

(2010

-

20012 ) Max 1 hour

(ppb)

(2010

-

2012 ) SLAMS

Monitors

Required Active

SLAMS

Monitors Active

SPM

Monitors Monitors

Needed

Eureka

Arcata,

Fortuna Humboldt 134,623 Jacobs

0 Jacobs

1.4 Jacobs 2.2

0 0 2 0 Humboldt

Hill*

0 Humboldt

Hill*

0 Humboldt

Hill*

0

Crescent

City Del Norte 28,610

- - - 0 0 0 0

none Trinity 13,786

- - - 0 0 0 0



### *Humboldt Hill data calculated using only 2011 and 2012.

No monitors are required for SIP or Maintenance Plans. The NCUAQMD is not required

to monitor SO 2



### . NCUAQMD monitor s SO 2 

### in Humboldt County to examine population

exposure.Page 15 of 27



## CO

Table 10 . Minimum Monitoring Requirements for CO.

Micro

politian

Statistical

Area County Pop. in

Year

2010 8

- hour

Design

Value

(ppm)

(2010

-

2012 ) 1 hour. Design Value

(2010

- 2012 )

SLAMS Monitors

Required Co l

located

Monitors

Required Active

SLAMS

Monitors Active

SPM

Monitors Monitors

Needed



### Eureka

Arcata

Fortuna Humboldt 134,623 Jacobs

0.7 Jacobs

1.0

0 

### 0 0 2 0 Humboldt

Hill

0.6 Humboldt

Hill

0.6

Crescent

City Del Norte 28,610

- - 0 

### 0 0 0 0

none Trinity 13,786

- - 0 

### 0 0 0 0



### No monitors are required for SIP or Maintenance Plans. The NCUAQMD is not required

to monitor CO. NCUAQMD monitor s CO in Humboldt County to examine population

exposure.



## Pb

Table 11 . Minimum Monitoring Requirements for Pb.

MSA County Pop. In

Year 20 10 Annual

Design Value Monitors

Required Active

Monitors Monitors

Needed



### Eureka, Arcata,

Fortuna Humboldt 134,623



### - 0 0 0

Crescent City Del Norte 28,610



### - 0 0 0

none Trinity 13,786



### - 0 0 0

No monitors are required for SIP or Maintenance Plans. The NCUAQMD is not required

to monitor Pb and does not do so.Page 16 of 27



# Quality Control

All NCUAQMD ambient a ir monitoring meets stringent ARB Quality Control and Quality

Assurance requirements. ARB audit records and site information for NCUAQMD can be

found on the ARB website at http://www.arb.ca.g ov/aaqm/qmosqual/qmosqual.htm , or obtained by contacting NCUAQMD at (707) 443

- 3093.



# Coll ocation

The NCUAQMD is a member of the ARB PQAO and relies on the ARB PQAO network

to satisfy collocation requirements. It is ARB’s responsibility to show that this

requirement is met. No collocation of SPM monitors is required



# Recent or Proposed Modifications to Network

The District proposes to discon tinue the Eureka I st reet monitoring station. The two

largest reasons for this are: there is an exhaust vent in violation of siting criteria and

access to the site is too limited to allow for the 1 in 3 sampling required by the 2012

NAAQS revision. The Jac obs station would be reclassified as a SLAMS for PM 10 

### and

PM 2.5



### . EPA approval is pending.

The Special Purpose PM 2.5 

### FRM sampler currently located at Jacobs station will be

moved to Humboldt Hill station in 2013. This is to allow data comparison of the FRM

instrument to the FEM Grimm 180. A continuous PM2.5 FEM BAM1020 or an R&P FRM

2000 will be i nstalled at the Jacobs station.

A conti nuous PM10 FEM BAM1020 monitor will be placed in Cres cent City in 2013. It is

not possible to collocate it with the curren t FRM PM 10 

### . The FRM will be removed after

the FEM is fully operational

. EPA approval is pending.

As soon as funding can be secured, a continuous PM2.5 FEM BAM1020 is planned to

be placed in Crescent City, collocate d with the PM10 discussed above to more fully

understand the PM levels in Crescent City. Also, a continuous PM2.5 BAM1020 is

planned to be placed in Trinity County at a locatio n d istant from the current station to

more full y understand the PM levels in Trinity County

.



# Review of Changes to PM 2.5 Monitoring Network

The NCUAQMD has not change d the location of any violating PM2.5 monitor. Any

changes to the NC UAQMD’s PM2.5 network are reviewed by EPA Region Nine

. NCUAQMD has never removed a PM2.5 monitor, and has added t hree monitor s since

the inception of its 2.5 monitoring program. If a violating PM2.5 monitor ever needed to

be moved

, we would use the annual network plan inspectio n/comment process to

provi de for the review of this change.

I n March of 2013 the District move d the Special Purpose FRM pm2.5 sampler located at

Jacobs station to Humboldt Hill Station. This will allow comparison to the FEM Grimm

180 operating there. A co ntinuous PM2.5 FEM BAM1020 or an R&P FRM 2000 will be

installed at the Jacobs station.Page 17 of 27



### The District proposes to discontinue the Eureka I st reet monitoring station. The two

largest reasons for this are: there is an exhaust vent too close to the samplers, and

access to the site is too limited to allow for the 1 in 3 sampling required by the 2012

NAAQS revision. The Jacobs station would be reclassif ied as a SLAMS for PM 2.5



### . EPA

approval is pending.



# Data Submission Requirements

Data and Precision/Accuracy reports are submitted to the California Air Resources

B oard (CARB) no later than 60 days after the quarter of record. The C ARB uploads

NCUAQMD data to the National Air Quality System ( AQS ) no later than 90 days after

the quarter of record. In the past, t he C ARB has submitted the annual data certification

no later than May each year. Beginning in 2013, NCUAQMD will take over this

responsibility.



# Data Availability

NCUAQMD air quality data is available on t he AQS database. It can also be obtained

directly from NCUAQMD, in the form of monthly reports. Please contact NCUAQMD at

707

- 443

- 3093 to request copies of these reports.Page 18 of 27



# Detailed Site Information

Site Name: Jacobs

The Jacobs site was established in December of 2006 it is located on the South side of

Eureka and is expected to represent neighborhood scale air quality.

Site Name Jacobs

AQS ID 060231004

GIS coordinates 103.91015E 4514.83731N WGS84

Location Alice Birney Elementary School

Address 717 South Ave, Eureka

County Humboldt

Dist. to road

(meters) 50

Traffic count

(AADT) 3100 (2007)

Representative

statistical area

name Eureka, Arcata, Fortuna

Groundcover grass

PEP audit? Information maintained by EPA

NPAP audit? Information maintained by EPA

PM

10 Flow audits Performed every 15 sampling runs by NCU AQMD, Performed bi annually by ARB

PM 2.5 Flow

audits Performed monthly by NCUAQMD, Performed biannually by ARB

Gaseous audits Performed annually by ARB

Date of most

recent ARB audit December 5, 2012

Gaseous One

point control

checks Performed a minimum of once every two weeks

Representative

Area Humboldt County Micropolitian Statistical Area,

Eureka

- Arcata

- Fortuna, suburban

Pollutant O3 NO2 CO SO2 PM2.5 PM10

Parameter Code 44201 42602 42101 42401 88101 85101 &

81102

POC 1 1 1 1 1 1

Basic

Monitor ing

Objective NAAQS

comparison NAAQS

comparison NAAQS

comparison NAAQS

comparison NAAQS

comparison NAAQS

comparison

Site Type Population

oriented Population

oriented Population

oriented Population

oriented Population

oriented Pop ulation

oriented

Monitor Type Special

purpose Special purpose Special purpose Special

purpose Special

purpose Special

purpose

Spatial scale Neighborhood Neighborhood Neighborhood Neighborhood Neighborhood Neighborhood

Sampling

method Photometric

EQOA

- 0880

-

047 Chemiluminesc

ence

RFNA

- 1289

- 074 Gas Filter

correlation

RFCA

- 0981

-

054 Pulsed

Florescence

EQSA

- 0486

-

060 Low Volume

RFPS

- 0498

-

117 High Volume

RFPS

- 1287

-

063

Instrument

manufacturer

and model Thermo

49i Thermo

42i Thermo

48i Thermo

43i R&P

2000 Thermo

HVolPage 19 of 27

Site Name Jacobs

Pollutant O3 NO2 CO SO2 PM2.5 PM10

FRM/FEM/ARM FEM FRM FRM FEM FRM FRM

Collecting

Agency NCUAQMD NCUAQMD NCUAQMD NCUAQMD NCUAQMD NCUAQMD

Analytical Lab N/A N/A N/A N/A BAAQMD NCUAQMD

Reporting

Agency ARB ARB ARB ARB BAAQMD ARB

Start date Dec 15, 2006 Dec 15, 2006 Dec 15, 2006 Dec 15, 2006 Dec 25, 2006 Dec 15, 2006

Current

Sampling

Frequency continuous continuous continuous continuous 1:3 Oct

- Mar

1:6 Apr

- Sept 1:6

Sampling season Year round Year round Year round Year round Year round Year round

Probe height

(meters) 4.5 4.5 4.5 4.5 N/A N/A

Distance from

supporting

structure

(meters) 1.9 1.9 1.9 1.9 N/A N/A

Distance from

obstructions on

roof N/A N/A N/A N/A N/A N/A

Distance from

obstructions not

on roof (meters) 19 19 19 19 19 19

Distance from

trees (meters) 15 15 15 15 15 17

Distance to

furnace or

incinerator flue N/A N/A N/A N/A N/A N/A

Distance

between

collocated

monitors N/A N/A N/A N/A N/A N/A

Unrestricted

airflow (degrees) 360 360 360 360 360 360

Probe material Teflon Teflon Teflon Teflon N/A N/A

Residence time

(seconds) 9.6 9.6 5.5 11.4 N/A N/A

Will there be

changes within

the next 18

months? No No No No Yes No

Is it suitable for

comparison

against the

annual PM2.5? N/A N/A N/A N/A Yes N/APage 20 of 27



## Site Name: Eureka I Street

The Ist site was established in 1986 . It is located in downtown Eureka near HWY 101

and is ex pected to represent middle scale air quality.

Site Name Eureka Ist

AQS ID 060231002

GIS coordinates 103.92619 E 4517.39332 N WGS84

Location Humboldt County Health Department

Address 529 Ist, Eureka

County Humboldt

Dist. to road 9 meters to 6 th St, 30 meters to 5 th St.

Traffic count 6 th street has ADT of 9,000 , 5 th street has ADT of 25,5 00

Groundcover Paved

PEP audit? Information maintained by EPA

NPAP audit? Information maintained by EPA

PM10 Flow audit Performed every 15 sampling runs by NCU AQMD, Performed bi

- annually by ARB

PM2.5 Flow Audit Performed monthly by NCUAQMD, Performed bi

- annually by ARB

Date of most recent

ARB audit December 5, 2013

Representative Area Humboldt County Micropolitian Statistical Area,

Eureka

- Arcata

- Fortuna, Urban

Pollutant PM2.5 PM10

Parameter code 88101 85101 & 81102

POC 1 1

Basic Monitoring

Objective NAAQS comparison NAAQS comparison

Site Type Highest Concentration Highest Concentration

Monitor Type SLAMS SLAMS

Spatial scale Middle Scale Middle Scale

Sampling method Low Volume RFPS

- 0498

- 117 High Volume RFPS

- 1287

- 063

Instrument

manufacturer and

model R & P

2000 Thermo

HVol

FRM/FEM/ARM FRM FRM

Collecting Agency NCUAQMD NCUAQMD

Analytical Lab BAAQMD NCUAQMD

Reporting Agency BAAQMD ARB

Start date Jan 1999 Nov 1986

Current Sampling

Frequency 1:3 Oct

- Mar

1:6 Apr

- Sept 1:6

Sampling season Year round Year round

Probe height (meters) 6 6

Distance from

supporting structure

(meters) 2 2

Distance from

obstructions on roof

(meters) 5 5.5

Distance from

obstructions not on

roof (meters) 25 25Page 21 of 27

Site Name Eureka Ist

Pollutant PM2.5 PM10

Distance from trees

below probe height

(meters) 6.5 4.6

Distance to furnace or

incinerator flue

(meters) 5 5

Distance between

collocated monitors N/A N/A

Unrestricted airflow 270 degrees 270 degrees

Probe material N/A N/A

Residence time N/A N/A

Will there be changes

within the next 18

months? Yes No

Is it suitable for

comparison against

the annual PM2.5? Yes N/APage 22 of 27



## Site Name: Humboldt Hill

The Humboldt Hill site was established in June 2011 . I t is located in Humboldt Hill on the South side of Eureka and is expected to represent neighborhood scale air quality.

Site Name 

### Humboldt Hill

AQS ID 060231005

GIS

coordinates 40.71528 (N)

- 124.20139 (W)

Location Humboldt Hill Summit

Address 7333 Humboldt Hill Road, Eureka

County Humboldt

Dist. to road 25

Traffic count Unknown, less than 50

Groundcover grass

PEP audit? Information maintained by EPA

NPAP audit? Information maintained by EPA

PM 10 Flow

audits Performed every 15 sampling runs by NCU AQMD, Performed bi

- annually by ARB

Gaseous audits Performed annually by ARB

Date of most

recent ARB

audit Dec 5, 2012

Gaseous One

point control

checks Performed a minimum of once per two weeks

Representative

Area Humboldt County Micropolitian Statistical Area,

Eureka

- Arcata

- Fortuna, suburban

Pollutant O3 NO2 CO SO2 

### NH3 PM 2.5 PM 10 

### Toxics

Parameter

code 44201 42602 42101 42401 42604 88101 85101 &

81102

POC 1 1 1 1 1 1 1

Basic

Monitoring

Objective NAAQS

comparison NAAQS

comparison NAAQS

comparison NAAQS

comparison Air

pollution

data Air

pollution

Data NAAQS

comparison Air

pollution

data

Site Type Population

oriented Population

oriented Population

oriented Population

oriented Population

oriented Population

oriented Population

oriented Population

oriented

Monitor Type Special

purpose Special

purpose Special

purpose Special

purpose Special

purpose Special

purpose Special

purpose Special

purpose

Spatial scale Neighbor

hood Neighbor

hood Neighbor

hood Neighbor

hood Neighbor

hood Neighbor

hood Neighbor

hood Neighbor

hood

Sampling

method Photometri

c

EQOA

0880

- 047 Chemilum

inescence

RFNA

1289

- 074 Gas Filter

correlation

RFCA

0981

- 054 Pulsed

Florescenc

e

EQSA

0486

- 060 Chemilum

inescence Light

scatter

EQPM

0311

- 195 High

Volume

RFPS

1287

- 063 Summa

canister

Instrument

manufacturer

and model Thermo

49i Thermo

42i Thermo

48i Thermo

43i Thermo 17i Grimm

180 Thermo

HVol ATEC

2200Page 23 of 27

Site Name 

### Humboldt Hill

Pollutant O3 NO2 CO SO2 NH3 PM2.5 PM10 Toxics

FRM/FEM/

ARM FEM FRM FRM FEM N/A FEM FRM N/A

Collecting

Agency NCUAQMD NCUAQMD NCUAQMD NCUAQMD NCUAQMD NCUAQMD NCUAQMD NCUAQMD

Analytical Lab N/A N/A N/A N/A N/A N/A NCUAQMD AAC

Reporting

Agency ARB ARB ARB ARB N/A ARB ARB N/A

Start date June 20,

2011 June 20,

2011 June 20,

2011 June 20,

2011 Dec

13,2012 June 20,

2011 Dec 15,

2011 Dec 15,

2011

Current

Sampling

Frequency continuous continuous continuous continuous continuous continuous 1:6 monthly

Sampling

season Year round Year round Year round Year round Year round Year round Year round Year round

Probe height

(meters) 4.5 4.5 4.5 4.5 4.5 5.3 N/A 4.5

Distance from

supporting

structure

(meters) 1.9 1.9 1.9 1.9 1.9 1.2 N/A 1.9

Distance from

obstructions

on roof N/A N/A N/A N/A N/A N/A N/A N/A

Distance from

obstructions

not on roof

(meters) 15 15 15 15 15 15 15 15

Distance from

trees (meters) 93 93 93 93 93 93 93 93

Distance to

furnace or

incinerator

flue N/A N/A N/A N/A N/A N/A N/A N/A

Distance

between

collocated

monitors N/A N/A N/A N/A N/A N/A N/A N/A

Unrestricted

airflow

(degrees) 360 360 360 360 360 360 360 360

Probe material Teflon Teflon Teflon Teflon Teflon Stainless

steel N/A Teflon

Residence

time

(seconds) 10.7 10.8 10.4 13.7 14.8 N/A N/A N/A

Will there be

changes within

the next 18

months? No No No No 

### No No No 

### No

Is it suitable

for comparison

against the

annual PM2.5? N/A N/A N/A N/A N/A No N/A N/APage 24 of 27



## Si te Name: Weaverville

The Weaverville site was established in 1995. It is located downtown Weaverville near

HWY 299 and is ex pected to represent middle scale air quality.

Site Name Weaverville

AQS ID 061050002

GIS coordinates 104.95617 E 4509.31330 N WGS84

Location Trinity County Courthouse

Address 11 Court Street, Weaverville

County Trinity

Dist. to road 7 meters to side road, 21 meters to highway 299

Traffic count 1408 AADT f or Garden Gulch; 5,100 AADT for HWY 299

Groundcover Paved

PEP audit Information maintained by EPA

NPAP audit Information maintained by EPA

PM10 Flow audit Performed every 15 sampling runs by NCU AQMD Performed bi annually by ARB

Date of most recent

ARB audit October 2, 2012

Representative Area Rural, no MSA in Trinity County

Pollutant PM2.5 PM10

Parameter Code 88101 85101 & 81102

POC 1 1

Basic monitor

objective Air Pollution Data NAAQS comparison

Site Type Population oriented Population oriented

Monitor Type SPM SLAMS

Spatial scale Middle Scale Middle Scale

Sampling method GRIMM 180 FEM High Volume RFPS

- 1287

- 063

Instrument

manufacturer and

model Grimm

180 Thermo

HVol

FRM/FEM/ARM FEM FRM

Collecting Agency NCUAQMD NCUAQMD

Analytical Lab N/A NCUAQMD

Reporting Agency ARB ARB

Start date Aug 2011 Jan 1995

Current Sampling

Frequency Continuous 1:6

Sampling season Year round Year round

Probe height

(meters) 9.4 7

Distance from

supporting structure

(meters) 3 1.5

Distance from

obstructions on roof

(meters) 10 7

Distance from

obstructions not on

roof (meters) 20 20Page 25 of 27

Site Name Weaverville

Pollutant PM2.5 PM10

Distance from trees

(meters) 15 15

Distance to furnace

or incinerator flue N/A N/A

Distance between

collocated monitors N/A N/A

Unrestricted airflow

(degrees) 270 270

Probe material N/A N/A

Residence time N/A N/A

Will there be

changes within the

next 18 months? No No

Is it suitable for

comparison against

the annual PM2.5? No N/APage 26 of 27



## Site Name: Crescent City

The Crescent City site was established in 1998. It is located at the Del Norte County

Health Department near HWY 101 and is expected to represent neighborhood scale air

quality.

Site Name Crescent City

AQS ID 060150006

GIS coordinates 103.90908 E 4624.31858 N WGS84

Location Del Norte County Health Department

Address 880 Northcrest Dr

County Del Norte

Dist. to road 600 meters to HWY 101 200 meters to Northcrest

Traffic count 38,5 00 ADT HWY101 8,222 ADT Northcrest

Groundcover Paved/grass

PEP audit Information maintained by EPA

NPAP audit Information maintained by EPA

Flow audit Performed every 15 sampling runs by NCUAQMD, Performed annually by EPA, Performed

annually by ARB

Date of most recent

ARB audit December 4, 2012

Representative Area Del Norte County, Micropolitian Statistical Area,

Crescent City Urban

Pollutant PM10

Parameter Code 85101 & 81102

POC 1

Basic Monitoring

Objectives NAAQS comparison

Site Type Population oriented

Monitor Type SLAMS

Spatial scale Neighborhood

Sampling method High Volume RFPS

- 1287

- 063

Instrument

manufacturer and

model Thermo HVol

FRM/FEM/ARM FRM

Collecting Agency NCUAQMD

Analytical Lab NCUAQMD

Reporting Agency ARB

Start date Mar

- 1998

Current Sampling

Frequency 1:6

Sampling season Year round

Probe height 5.5 meters

Distance from

supporting structure 1.5 meters

Distance from

obstructions on roof N/APage 27 of 27

Site Name Crescent City

Pollutant PM10

Distance from

obstructions not on

roof N/A

Distance from trees 90 meters

Distance to furnace or

incinerator flue N/A

Distance between

collocated monitors N/A

Unrestricted airflow

(degrees) 360

Probe material N/A

Residence time N/A

Will there be changes

within the next 18

months? Yes

Is it suitable for

comparison against

the annual PM2.5? N/A



# Signature

The Executive Office of the North Coast Unified Air Quality Managemen t District hereby

verifies this plan has gone through a 30 day public comment period, and approves the

“ Air Monitoring Network Plan for 2013 ” . S taff is directed to begin implementation

effective immediately.

____________________________________________ __________________ Mr. Richard L. Martin Jr

. date