update air quality modeling and monitoring in the owens valley...

Update

Air Quality Modeling and Monitoring in the Owens Valley Planning Area

for the PM10 National Ambient Air Quality Standards

Ann LoganGreat Basin Unified Air Pollution Control District

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Owens Valley Planning Area (OVPA) PM10 NAAQS Exceedances 2000-2019

*2019 January – June data only

NAAQS PM10 Violation= 150 μg/m3 for 24-hour periodNAAQS PM10 Attainment= 3-yr Average ≤ 1

YearAverage

Exceedance (µg/m³)

Maximum Exceedance

(µg/m³)

Exceedance Day Count

2000 922 10,549 38

2001 1,247 13,611 42

2002 710 6,703 44

2003 1,005 10,933 37

2004 734 4,472 34

2005 619 3,989 26

2006 831 6,847 33

2007 261 508 14

2008 311 815 16

2009 330 1,507 20

2010 589 4,571 29

2011 428 3,444 21

2012 489 3,916 24

2013 265 529 15

2014 349 950 10

2015 320 1,487 14

2016 245 530 16

2017 416 2,165 17

2018 262 728 8

2019* 280 451 4 *2019 January – June data only

OVPA PM10 NAAQS Exceedances2000-2019

Site (Data Period) Peak Count (max # in a year)2018 Count

3-yr Average(2016-2018)

Dirty Socks (2001 - 2018) 44 3 4.33

Keeler (1993 - 2018) 23 2 5

Lizard Tail (2010 - 2018) 16 3 5.33

Lone Pine (1993 - 2018) 7 1 1

Mill Site (2012-2018) 6 1 1

North Beach (2000-2018 10 3 4

Olancha (1993 - 2018) 12 2 3.33

Shell Cut (2003 - 2018) 20 5 7.67

Stanley (2004 - 2018) 6 1 1

PM10 NAAQS Exceedances by Site

NAAQS PM10 Attainment= 3-yr Average ≤ 1

PM10 NAAQS Exceedances Source Identification

Identification of emissive sources accomplished by review of• Evaluation of hourly PM10 data and corresponding wind

speeds/directions• Dust Camera Review• Field Observations• Field Investigation (source mapping, ect)• Sand Flux Monitoring Data Evaluation• Owens Lake Yesterday (daily model with virtual sand flux)• Annual Modeling

WIND DIRECTION SCREENING

PM10 Pollution Roses

2016- 2019

Pollution Rose data includes all hours 1/1/2016-3/31/2019PM10 Federal Exceedance Data 2016-2018

Owens Lake Modeling

Modeling System• CALPUFF Modeling System• Critical Inputs

Source Areas Configuration Emissions (PM10 = Kf x sand flux) Meteorological Data

• Source areas and sand motion data influence model results more than the K-factors and dispersion model options

Results• Model calculates PM10 impacts to shoreline/community

receptors for each source area• Lone Violator = source area that contributes at least 130µg/m³ to any

shoreline/community receptor on any day• Watch Areas = source area that contributes at least 80µg/m³ to any

shoreline/community receptor on any day• Model run yearly since the 2016 SIP to assist in determination

if additional areas need to be ordered for control

Model purpose is to temporarily and spatially resolve source area emissions

Sand Flux Monitoring Network

SOURCE AREAS

2014-2016 Areas 2016-2017 Areas 2017-2018 Areas

Lone (acres)

Watch (acres)

Lone (acres)

Watch (acres)

Lone (acres)

Watch (acres)

Uncontrolled Lakebed

Eligible ESA Areas (deferred) 210 0 514 91 301 26

Unordered Lakebed 0 0 38 98 73 14

Controlled Lakebed

Shallow Flood Wetness Cover Refinement Field Test 456 31 25 38 10 0

Minimum Dust Control Efficiency DCAs 0 0 0 0 0 43

Phase 9/10 Areas (Pre-Phase and During Construction)

1199 89 358 225 0 0

Keeler DunesUncontrolled 412 102 385 239 106 210

Controlled 90 10 67 0 67 0

Individual Source Area 24-hour contribution at shoreline or community receptorLone > 130 ug/m3Watch > 80 ug/m3

* Model includes Keeler Dunes but does not include most other off lake sources areas

Owens Lake Modeling Results 2014-2018

Monitoring and Modeling Primary Sources Contributing to PM10 NAAQS Exceedances

To ensure continued progress towards NAAQS PM10 Attainment

1. Maintain Current Level of Control• Avoid emissions from current controls (transition

areas, test areas, breakdowns/variances)• Ensure any refinement of BACM criteria keeps

necessary control efficiency in all conditions• No backsliding

2. Work to Address Currently Emissive Areas• Annual Additional BACM Contingency

Determination (future dust control orders)• Keeler Dunes Dust Control Project• Environmentally Sensitive Areas• Off lake sources

3. Avoid Creation of New Sources • Groundwater pumping impacts to stable

vegetated dunes and stable salt crust areas• Other anthropogenic activities/sources

Owens Lake Stable Vegetated Dune Systems and Stable Salt Crust Areas

PM10 Pollution Rose 2016-2019

Lone Pine


North Beach


Lizard Tail


Keeler


Mill


Shell Cut


Dirty Socks


Stanley

Update�Air Quality Modeling and Monitoring �in the Owens Valley Planning Area�for the PM10 National Ambient Air Quality Standards Owens Valley Planning Area (OVPA) �PM10 NAAQS Exceedances 2000-2019OVPA PM10 NAAQS Exceedances�2000-2019PM10 NAAQS Exceedances by SiteSlide Number 5WIND DIRECTION SCREENINGSlide Number 7Slide Number 8Slide Number 9Slide Number 10Slide Number 11PM10 Pollution Rose 2016-2019�Lone PinePM10 Pollution Rose 2016-2019 �North BeachPM10 Pollution Rose 2016-2019 �Lizard TailPM10 Pollution Rose 2016-2019 �KeelerPM10 Pollution Rose 2016-2019 �MillPM10 Pollution Rose 2016-2019 �Shell CutPM10 Pollution Rose 2016-2019 �Dirty SocksPM10 Pollution Rose 2016-2019 �Stanley

update air quality modeling and monitoring in the owens valley...

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