AMEC 

4021 Stirrup Creek, Suite 100

Durham, NC 27703

USA

Tel +1 (919) 381 9900 

Fax +1 (919) 281 9901

www.amec.com

DATE: 4 June 2012

TO: Robert Kelly, EPA Region 2

FROM: James Paumier, AMEC

EPA Contract EP-W-09-02, Task Order 0234

AMEC Project 6480110234

SUBJECT: Air Quality Modeling for Sources Affecting the National Park Service Class I 

Area on St. John, Virgin Islands, in support of the Regional Haze SIP for the 

Virgin Islands: Final Model Runs for Visibility Reduction

This memorandum summarizes the final modeling performed under the above referenced 

contract for the Virgin Islands (VI) regional haze modeling.

Section 1 discusses visibility observations at the Interagency Monitoring of Protected Visual 

Environments (IMPROVE) site on St. John, Virgin Islands. Visibility observations are tabulated 

and graphed. Section 2 describes the various sources in the U.S. and British Virgin Islands that 

were modeled using the CALPUFF modeling system, including modeling conducted with 

reductions to emissions applied to the Hovensa sources as well as the marine vessels (ferry, 

cargo and cruise ships). Section 3 describes the receptor network used in the modeling. Model 

results are tabulated in Section 4. In Section 5, possible explanations as to why the modeled 

visibility impacts at the IMPROVE site are less than the observed visibility impacts are briefly 

examined. As part of this examination, wind roses from the two surface stations used in the 

modeling are presented.
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1. VISIBILITY OBSERVATIONS AT THE U.S. VIRGIN ISLANDS IMPROVE SITE

According to the IMPROVE web site1, the IMPROVE program is a cooperative measurement 

effort established in 1985 to aid in the creation of Federal and State implementation plans for 

the protection of visibility in Class I areas. The objectives of the IMPROVE program are:

(1) to establish current visibility and aerosol conditions in mandatory class I areas; 

(2) to identify chemical species and emission sources responsible for existing man-made 

visibility impairment; 

(3) to document long-term trends for assessing progress towards the national visibility 

goal; and

(4) to provide regional haze monitoring representing all visibility-protected federal class I 

areas where practical. 

Figure 1 shows the location of the IMPROVE monitor (red balloon icon) on St. John, north of 

Cruz Bay, which is the main port on St. John. The Virgin Islands (VI) National Park, a Class I 

area over 7000 acres in size, is on the island of St. John. Additionally, Hassel Island, 

immediately south of Charlotte Amalie, St. Thomas (not shown in the figure) and about 15 

kilometers to the west of Cruz bay and the IMPROVE monitor location, is also part of the VI 

National Park. To assess visibility impacts at Class I areas, the National Park Service has 

predefined receptor locations in Class I areas at which visibility modeling is performed. For the 

VI National Park, 75 receptors have been defined, with one of those receptors on Hassel Island. 

Several Class I receptor locations for modeling purposes are shown (blue balloon icons) in 

Figure 1.

 

1

http://vista.cira.colostate.edu/improve/Overview/IMPROVEProgram_files/frame.htm
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

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Figure 1. Location of the IMPROVE Receptor on St. John, Virgin Islands.

Particulate matter samples are taken every three days at the IMPROVE monitor. From these 

data, we can calculate the impact of particulate matter on visibility at the site. Table 1 shows

the observed annual average, best 20% of days and worst 20% of days at the IMPROVE 

monitor on St. John for the period 2007-2010.

IMPROVE monitoring data tables present the following information:

 BEXT (Source) – calculated beta extinction coefficient (total IMPROVE monitor value –

modeled annual average background);

 BEXT (BKG) – background beta extinction coefficient (from modeled annual 

background);

 BEXT (Total) – beta extinction coefficient recorded at IMPROVE monitor;
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

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 BEXT SO4 – beta extinction coefficient from IMPROVE monitor SO4;

 BEXT NO3 – beta extinction coefficient from IMPROVE monitor NO3;

 BEXT OC – beta extinction coefficient from IMPROVE monitor organic carbon;

 BEXT EC – beta extinction coefficient from IMPROVE monitor elemental carbon;

 BEXT PMC – beta extinction coefficient from IMPROVE monitor coarse particulate 

matter;

 BEXT PMF – beta extinction coefficient from IMPROVE monitor fine particulate matter;

 BEXT NO2 – beta extinction coefficient from IMPROVE monitor NO2;

 dv (total) – deciview haze index from monitor emissions + modeled background;

 dv (bkg) – deciview haze index from modeled background; and

 ∆dv – change in deciview haze index = total monitored – background modeled 

emissions.

The graphs that follow Table 1 summarize the observed daily extinction by species at the 

IMPROVE site on St. John. The light blue background in the cells is only meant to more easily 

identify the years.

Ammonium nitrate fine (ammNO3f), ammonium sulfate-fine (ammSO4f), elemental carbon-fine 

(ECf), organic carbon-fine (OCMf), and sea salt-fine (SeaSaltf) are displayed. Omitted from the 

figures are coarse mass extinction, soil extinction (fine), and Rayleigh scattering.

Since observations are taken every third day, observations are reported on no more than 121 or 

122 days each year. For 2007, visibility data were reported for 84 days; for 2008, 2009, and 

2010, the number of days reporting is 113, 114, and 118, respectively. This corresponds to 17 

days for the “Best 20%” and 17 for the “Worst 20%” days for 2007, whereas, for 2008-2010, 23 

days correspond to the “Best 20%” and “Worst 20%”. Labels for the “Best 20%” (B) and “Worst 

20%” (W) of days based on aerosol extinction (which includes coarse mass extinction, soil 

extinction (fine)) are shown above the bars. 

Note that for 2007-2009, the maximum on the y-axis is 60 Mm-1, whereas for 2010 it is 80 Mm-1.
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

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Table 1. IMPROVE Monitoring Site - Observations, 2007-2010

BEXT 

(Source)

BEXT 

(BKG)*

BEXT 

(Total)

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

BEXT 

Ssalt

dv 

(total) dv (bkg) ∆dv

Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 IMPROVE -

Annual Average 24.78 15.60 40.38 9.14 2.01 0.68 0.49 6.76 2.47 -- 7.83 13.96 4.45 9.51

2007 IMPROVE -

Best 20% Days 10.08 15.60 25.68 5.15 1.38 0.48 0.44 3.13 0.25 -- 3.84 9.43 4.45 4.99

2007 IMPROVE -

Worst 20% Days 50.06 15.60 65.66 14.93 3.59 1.23 0.61 14.15 8.44 -- 11.70 18.82 4.45 14.37

2008 IMPROVE -

Annual Average 24.20 15.60 39.80 7.66 1.80 0.70 0.48 6.96 2.13 -- 9.07 13.81 4.45 9.37

2008 IMPROVE -

Best 20% Days 8.95 15.60 24.55 4.67 1.14 0.59 0.35 2.96 0.30 -- 3.55 8.98 4.45 4.54

2008 IMPROVE -

Worst 20% Days 48.15 15.60 63.75 11.57 2.87 0.80 0.32 14.11 7.42 -- 15.66 18.52 4.45 14.08

2009 IMPROVE -

Annual Average 26.00 15.60 41.60 8.94 1.75 1.10 0.78 6.94 2.32 -- 8.76 14.26 4.45 9.81

2009 IMPROVE -

Best 20% Days 11.61 15.60 27.21 5.87 1.31 0.48 0.41 3.28 0.25 -- 4.63 10.01 4.45 5.56

2009 IMPROVE -

Worst 20% Days 51.40 15.60 67.00 15.31 2.66 2.83 2.27 13.87 8.36 -- 10.71 19.02 4.45 14.57

2010 IMPROVE -

Annual Average 30.14 15.60 45.74 10.86 1.94 1.06 1.61 8.34 3.34 -- 7.57 15.20 4.45 10.75

2010 IMPROVE -

Best 20% Days 10.29 15.60 25.89 5.42 1.18 0.19 0.31 3.40 0.18 -- 4.21 9.51 4.45 5.06

2010 IMPROVE -

Worst 20% Days 64.36 15.60 79.96 17.69 3.21 3.31 5.49 18.16 12.39 -- 8.71 20.79 4.45 16.34

* Background [BEXT (BKG)] is assumed to be the same as average modeled background. All values other than BEXT (Total) in this table rely on the assumed background.
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

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B

B B

B B

W

W

B

W

W

W

W

W

B

W

W

W

W

W

W

W

W

B

B

B

B

B

B

B

W

W

B

B

B

0

10

20

30

40

50

60

Jan07Feb07Mar07Apr07May07Jun07Jul07Aug07Sep07Oct07Nov07Dec07

M

m-1

Observed Daily Aerosol Beta Extinction at IMPROVE Site

St. John, US Virgin Islands

ammNO3-f ammSO4-f EC-f OMC-f SeaSalt-f

2007
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B

B

B

B

W

B B

W

B

W

W

W

W

B

WW

W

W

W

W

W

W

W

W

W

W

W

W

B

W

B

B

BB B

B

B

W

B

B

B

W

B

B B

B

0

10

20

30

40

50

60

Jan08Feb08Mar08Apr08May08Jun08Jul08Aug08Sep08Oct08Nov08Dec08

M

m-1

Observed Daily Aerosol Beta Extinction at IMPROVE Site

St. John, US Virgin Islands

ammNO3-f ammSO4-f EC-f OMC-f SeaSalt-f

2008
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

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B

W

W

W

B

BB

B

B

B

B

B

B

W

W

B

W

W

W

W

WW

W

W

W

W

W

W

B

W

W

B

B

B

W

B

W

W

B

B

B

B

B

B

B

B

W

0

10

20

30

40

50

60

Jan09Feb09Mar09Apr09May09Jun09Jul09Aug09Sep09Oct09Nov09Dec09

M

m-1

Observed Daily Aerosol Beta Extinction at IMPROVE Site

St. John, US Virgin Islands

ammNO3-f ammSO4-f EC-f OMC-f SeaSalt-f

2009
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BB

B

B

W

W

B

W

W

B

W

B

B

B

W

B

W

W

W

W

W

W

W

W

B B

W

B

B

W

W

W

W

W

W

B B

W

B

B

B

B

B

B

W

B

B

B

B

B

B

0

10

20

30

40

50

60

70

80

Jan10Feb10Mar10Apr10May10Jun10Jul10Aug10Sep10Oct10Nov10Dec10

M

m-1

Observed Daily Aerosol Beta Extinction at IMPROVE Site

St. John, US Virgin Islands

ammNO3-f ammSO4-f EC-f OMC-f SeaSalt-f

2010
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2. SOURCES MODELED

AMEC developed a list of point sources and area sources for use in this modeling effort. Most 

of the sources and the associated parameters and emission rates were defined for the March 

2011 modeling. Table 1 shows the sources modeled with the respective emission rates for SO2, 

NOX, fine particulates, and elemental carbon. In this phase of the modeling, emission rates 

from BART-eligible sources were used (Hovensa, St. Croix WAPA, and St. Thomas WAPA). 

The sources are also divided into several logical categories to provide group-specific model 

results based on groups identified in the Task Order and several additional groups provided by 

the Task Order Project Officer (TOPO). 

Several sources of information were used to develop the list of sources, groupings of sources, 

emission rates, and source parameters. These include:

 AEG Anguilla Power Renewable Energy Power Generation Project (Table 6-4) with 

source parameters and emission rates (received 12/2010);

 AEG Bovoni Power, LLC (Table A-5) Nearby Inventory with source parameters and 

emission rates (received 12/15/2011);

 The spreadsheet St. John – Emissions Calculations.xls with emissions data for a 

number of sources on St. John (received 12/2010);

 Development of 2002 Regional Haze Area, Point, Nonroad Mobile, and Onroad Mobile 

Source Emission Inventories For St. John, Virgin Island - Draft Report (received 

12/2010);

 Central Intelligence Agency (CIA) World Factbook; and

 Email correspondence.

The sources in each group are explained in more detail in the discussion below. 

Group 1 - St. Croix – Hovensa Point Sources

Sources in this group were selected from Table 6-4 of the AEG Anguilla Project Report. In the 

original modeling (prior to modeling BART-eligible sources), this group contained seven sources

(six of the largest sources and one aggregate of the remaining sources), representing a total of 

approximately 75% of St. Croix’s total emissions. Since there were over 170 sources on St.

Croix, the model was limited to major emission points which were the electric utilities and the 

top 3 emitters of PM, SO2, or NOX. St. Croix sources were split between Groups 1 and 6, with 
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Group 1 representing only the Hovensa refinery, and Group 6 representing Water and Power 

Authority (WAPA) St. Croix sources.

For this modeling effort, BART-eligible boilers, heaters, flares, and reciprocating gas 

compressors at Hovensa were explicitly modeled. The result was 65 BART-eligible point 

sources. The aggregated source consisted of the nonBART sources. Emission rates for the 

aggregate source do not include any BART-eligible sources (i.e., no double counting of 

emissions).

Emissions regarding the flares were provided as a sum for the entire facility, with potential to 

emit rates of 1200 tpy SO2, 1897 tpy NOX, and negligible PM emissions. Ten flares were 

identified at Hovensa in the AEG Anguilla inventory, with zero emissions for two of them. Per 

email correspondence on May 11, 2012, only five flares are BART-eligible. A proportion of the 

total emissions (5 BART flares / 8 total flares) was used to approximate the BART flare

emissions.

Additional model runs were conducted for each year applying selected emissions reductions: 1) 

reductions to Hovensa emissions based on a Consent Decree and 2) reductions to the marine 

vessels (ferries, cargo ships, and cruise ships). The reductions are discussed prior to Table 2.

Group 2 – Actual St. John Point Sources

Sources in this category represent the actual point sources originally provided to AMEC by the 

TOPO for the original modeling completed in March 2011. Stack parameters for these sources 

have been estimated by AMEC using parameters for generic generators, since no such 

information was presented with the emissions calculations. Two additional sources obtained 

from the AEG Bovoni Power inventory were added for the current modeling effort: the Virgin 

Grand generator and the Virgin Grand incinerator. This category consists of seven (7) point 

sources.

Group 3 – Aggregate St. John Marine Sources

Marine sources at St. John include all ferry, cruise ship, and cargo ship emissions specified in 

the St. John – Emissions Calculations spreadsheet. Each vessel type was modeled as a 

separate aggregated source (e.g. all ferry emissions as a single source). The three different 

types of marine vessels were represented with different stack parameters obtained from typical 

cruise ship data specifications. An additional model run with reduced emissions was also 

conducted. As a conservative assumption, all three types of marine sources were modeled as 
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point sources located at the Cruz Bay docks, rather than spreading the emissions over a greater 

area. 

As noted above for the Hovensa source group, an alternative set of emission rates for the 

marine sources at St. John was modeled. The reductions are discussed prior to Table 2. 

Group 4 – Sample Puerto Rico Sources

Emissions and stack location are based on the AES Puerto Rico, L.P. 454 MW coal fired power 

plant in Guayama, Puerto Rico. The stack parameters are based on a similarly sized coal-fired 

boiler.

Group 5 - Actual St. Thomas Sources

In the current modeling effort this source group was removed because the source was included 

as one of the St. Thomas WAPA sources in the newly added Group 14.

Group 6 – Other St. Croix Sources

Sources in this category are from Table 6-4 of the AEG Anguilla Power report and emissions 

rates were updated, if necessary, with rates from the AEG Bovoni Power report. This group 

consists of eight sources – seven individual point sources and 1 aggregated point source. Six 

of the individual point sources are St. Croix WAPA and the seventh is the large boiler at 

Renaissance Group I.L.L.P. The aggregated source consists of seven point sources, including 

the large and small generators at Renaissance, the Buccaneer Hotel, Divi Carina Bay Resort, 

Carambola Resort, and oil burners at Virgin Island Asphalt Products Corporation. The location 

and stack parameters for the aggregated source were conservatively represented by placing the 

source in the same location as the largest emitter of PM10 on St. Croix, the Hovensa wet 

scrubber, which was modeled in Group 1. The large boiler at Renaissance accounts for about 

95% of the SO2 emissions and 65% of the NOX emissions in the two nonWAPA sources. 

For this modeling effort, two boilers at WAPA, model IDs WPSX10 and WPSX11, were modeled

as BART-eligible sources. Per data provided in a spreadsheet on February 23, 2012 and a 

follow-up email on March 6, the 3-year average actual emissions were used for the St. Croix 

BART-eligible WAPA sources. The other four St. Croix WAPA sources were not BART-eligible

and emission rates from the AEG Anguilla report were used. 
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Group 7 – Aggregate British Virgin Islands (BVI) Sources

This category represents emissions from total oil usage on the BVI. The oil usage data was 

selected from the Central Intelligence Agency (CIA) World Factbook (1000 bbl/day). The 

Department of Energy (DOE) website indicates that residual oil is not consumed in significant 

quantity in the BVIs, so only a distillate emission factor was estimated. The distillate oil 

emission rates were calculated from AP-42, Chapter 1.3 (Fuel Oil Combustion), conservatively 

assuming a sulfur content of 0.5% (Source: Latin America and the Caribbean Sulphur Levels in 

Diesel Fuel, UNEP).

AMEC created an area source representative of the island of Tortola. Tortola is the closest of 

the BVIs to St. John. The area source represents the largest city on Tortola, Road Town. It is 

represented as a 2.5 km2square area source, covering the majority of the land area of Road 

Town.

Group 8 – Simulated BVI Sources

The modeled area source represents general land clearing via open burning. The emission 

factors used were taken from AP-42 Chapter 11.9, Table 11.9-1 for overburden. Section 13.2.3, 

“Heavy Construction,” advises using this factor for general land clearing. The area modeled is 

100m x 100m and the location is based on sensible and possible locations of future land 

clearing.

Group 9 – St. John Paved and Unpaved Road Fugitive Sources

This group was modeled with an 80% reduction in the emission rates from the March 2011 from 

paved and unpaved roads

A single area source was modeled to represent fugitive dust emissions from roadways on St. 

John. The emission rates were from the St. John – Emissions Calculations spreadsheet. 

Paved roads are responsible for 32.7 tons per year (TPY) of particulate matter emissions on St. 

Johns, while unpaved roads produce 99.4 TPY. The area modeled is a 5 kilometer by 10.4

kilometer (km) rectangular region, representing an area equal to the 52 km2land area of St. 

John.

Group 10 – Aggregate St. John Burning

A single area source was modeled to represent all sources of fires on St. John, including open 

burning, forest fires, and structure fires. The emission rates were from the spreadsheet St. John 
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– Emissions Calculations.xls. The area is conservatively modeled as 8.6km by 3.4km rectangle 

(about 29.4 km

2

) that is contained mostly within the land mass of St. John.

Group 11 – St. John Residential Boilers

The modeled area source represents emissions from residential boiler usage on St. John. The 

emission rates were from the spreadsheet St. John – Emissions Calculations.xls. The area is 

conservatively modeled as 3km by 3km square region, located at Cruz Bay, St. John.

Group 12 – St. John Miscellaneous Industrial Processes/Construction

The modeled area source represents emissions from other industrial sources on St. John. 

There are two sources represented by Group 12. The Majestic Concrete facility emits 0.32 

Tons per Year of particulate matter, and residential construction emits 10.7 Tons per Year. The 

emission rates were from the spreadsheet St. John – Emissions Calculations.xls. The area is 

conservatively modeled as 3km by 3km square region, located at Cruz Bay, St. John.

Group 13 – St. John Motor Vehicle Emission Sources

The modeled area source represents motor vehicle emissions on St. John. The emission rates 

were provided in an e-mail from the TOPO. The area modeled is a 5 km x 10.4 km rectangular 

region, representing an area equal to the 52 km2land area of St. John, the same as in Group 9 

for paved/unpaved roads.

Group 14 – St. Thomas - WAPA Sources

This group is new for the March 2012 visibility modeling effort and consists of 10 combustion 

and boiler sources at the WAPA facilities on St. Thomas. Data from the AEG Bovoni Power 

inventory report were used to develop the input source parameters and emission rates for the 

modeling. 

The single source that was in Group 5 in the March 2011 modeling was moved to this group and 

the emission rates updated. Emissions based on the Virgin Islands Water and Power Authority 

(VIWAPA) – Unit 23, at Krum Bay were modeled. It is a 39 MW turbine that burns No. 2 

distillate fuel oil. The stack parameters were based on an engineering estimate for a similarly 

sized turbine.

For this modeling effort, two boilers at WAPA, model IDs WPSX10 and WPSX11, were modeled 

as BART-eligible sources. Per data provided in a spreadsheet on February 23, 2012 and a 
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follow-up email on March 6, the 3-year average actual emissions were used for the St. Croix 

BART-eligible WAPA sources. The other four St. Croix WAPA sources were not BART-eligible 

and emission rates from the AEG Anguilla report were used. 

Group 15 – St. Thomas - Other Sources

This group is new for the March 2012 visibility modeling effort and consists of 13 point sources 

and one area source on St. Thomas. Data from the AEG Bovoni Power inventory report were 

used to develop the input source parameters and emission rates for the modeling. Sources in 

this group included several resorts, the St. Thomas Hospital, and asphalt facility, and operations

at a quarry. One of the quarry locations was modeled as a point source (crushing and handling) 

and another was modeled as an area source (blasting/drilling operations).

Group 17 – St. John Non-road

A spreadsheet with non-road sources on St. john was received on May 16, 2012 and included in 

the full model runs. This source group consisted of non-road gasoline and diesel vehicles (e.g., 

light commercial and farm), equipment (e.g. lawn and garden), and other (e.g., compressed 

natural gas) sources.

The area was modeled as a 5 km x 10.4 km rectangular region, representing an area equal to 

the 52 km2land area of St. John, the same as in Group 9 for paved/unpaved roads.

2.1EMISSIONS REDUCTIONS

As noted above, CALPUFF and CALPOST were rerun for all four years using the same 

emissions as shown in Table 2, except with the following emissions reductions: 1) Hovensa 

Consent Decree and 2) Reductions to the marine vessels (ferries, cargo ships, and cruise 

ships). 

The reductions from the consent decree were 3,460 tons/year for SO2, 4,744 tons/year for NOX,

and 17 tons/year for particulates. The total reductions were applied to a subset of the sources 

identified in Table 2 as follows: 10% to B1155 (model ID 3), 10% to B33012 (model ID 4), 10% 

to B1151_4 (model ID 80), 10% to B3303_4 (model ID 81), and 60% to the aggregate source 

(model ID 7). The reason for applying the consent decree reductions to selected sources was 

to minimize the amount of recalculations that would be required. Another reason for applying 

the reductions in this manner is that the Hovensa sources are on St. Croix, approximately 70 

kilometers from the modeled receptor network.
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In addition to the Hovensa consent decree reductions, emissions from marine sources – ferries, 

cargo ships, and cruise ships - were reduced by 85% for PM and SO2, and 80% for NOX. The 

following table shows the reduced emissions used in the modeling.

Location and Model ID SO2 (g/s) NOX (g/s) PMF (g/s) EC (g/s)

Hovensa B1155 13.50 18.62 2.86 2.86E-02

Hovensa B33012 9.08 11.32 2.29 2.29E-02

Hovensa B1151_4 8.85 12.00 2.26 2.26E-02

Hovensa B3303_4 26.88 18.59 4.47 4.47E-02

Hovensa HOVENS (aggregated source) 5.00 16.03 25.67 2.57E-01

St. John FERRY 3.675E-01 1.70 3.11E-02 3.11E-04

St. John CRUISE 3.63E-02 1.25E-01 5.65E-03 5.65E-05

St. John CARGO 2.12E-03 5.52E-03 2.59E-04 2.59E-06
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Table 2. Sources, Source Groups, and Modeled Emission Rates

Group

#

Source 

Group Model ID Type Model ID #

Location Description SO2

(g/s)

NOx

(g/s)

PMF

(g/s)

EC*

(g/s)

Comment

1

St. Croix -

Hovensa 

BARTeligible

Sources

B1155 Point 3 St. Croix Nos. 3 and 5 Boilers 23.44 32.43 2.91 2.91E-02

B33012 Point 4 St. Croix Nos. 6 and 7 Boilers 19.03 25.04 2.34 2.34E-02

B1151_4 Point 80 St. Croix Nos. 1 and 4 Boilers 18.77 25.72 2.31 2.31E-02

B3303_4 Point 81 St. Croix Nos. 8 and 9 Boilers 36.83 32.21 4.52 4.52E-02

G1101E Point 82 St. Croix GT#1 Turbine 3.90 23.18 3.51E-01 3.51E-03

G1101F Point 83 St. Croix GT#2 Turbine 3.90 23.18 3.51E-01 3.51E-03

G1101G Point 84 St. Croix GT#3 Turbine 3.90 23.18 3.51E-01 3.51E-03

G3404 Point 85 St. Croix GT#4 Turbine 4.63 23.29 3.71E-01 3.71E-03

G3405 Point 86 St. Croix GT#5 Turbine 4.63 22.05 3.71E-01 3.71E-03

G3406 Point 87 St. Croix GT#6 Turbine 4.63 22.05 3.71E-01 3.71E-03

G3407 Point 88 St. Croix GT#7 Turbine 4.63 22.05 3.71E-01 3.71E-03

G3408 Point 6 St. Croix GT#8 (Gas Turbine) 4.82 28.82 4.4E-01 4.4E-03

G3409 Point 89 St. Croix GT#9 Turbine 1.50 4.32 4.03E-01 4.03E-03

Various Point 100 -

137 St. Croix 38 Heaters See Table 3

C200A, B, 

C

Point 138 -

140 St. Croix Reciprocating Gas Compressors 0.0 9.52E-01 5.75E-03 5.75E-05

C4601A, B, 

C

Point 141 –

143 St. Croix Reciprocating Gas Compressors 0.0 10.90 2.59E-02 2.59E-04

Various Point 144 –

151 St. Croix Flares 2.70 4.26 0.0 0.0

HovensanonBART HOVENS Point 7 St. Croix St. Croix - Hovensa

Aggregated Sources 64.72 97.91 25.96 0.2596
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 18 AMEC

Group

#

Source 

Group Model ID Type Model ID #

Location Description SO2

(g/s)

NOx

(g/s)

PMF

(g/s)

EC*

(g/s)

Comment

2

Actual St. 

John Point 

Sources

CANEEL Point 8 St. John Caneel Bay Resort –

Backup Generators 0.015 7.26E-03 8.64E-04 8.64E-06

GALLOW Point 9 St. John Gallows Point Resort –

Dryers and Backup Generator 1.15E-05 5.51E-04 2.44E-06 1.15E-07

GRANDE Point 10 St. John Grande Bay Resort –

Backup Generator 4.66E-03 2.39E-03 2.61E-04 2.61E-06

MYRAH Point 11 St. John Myrah Keating Smith Health 

Center - Backup Gen & WH 5.92E-04 7.70E-04 3.47E-05 3.47E-07

WPSJ_U7 Point 12 St. John VIWAPA St. John - Generator 0.630 10.21 0.1764 1.764E-03

VGGENE Point 37 St. John Virgin Grand Generator 0.540 3.510 0.680 6.80E-03

VGINCI Point 38 St. John Virgin Grand Incinerator 0.050 0.010 0.130 1.30E-03

3

Aggregate St. 

John Marine 

Sources

FERRY Point 13 St. John All Ferries Servicing St. John –

at Cruz Bay Docks 2.45 8.5 2.07E-01 2.07E-03

CRUISE Point 14 St. John All Cruise Ships Servicing St. 

John - at Cruz Bay Docks 2.42E-01 6.27E-01 3.77E-02 3.77E-04

CARGO Point 15 St. John All Cargo Ships Servicing St. 

John - at Cruz Bay Docks 1.41E-02 2.76E-02 1.73E-03 1.73E-05

4

Sample 

Puerto Rico 

Sources

PRPOWE Point 16 Puerto 

Rico Puerto Rico AES Power Plant 13.03 59.2 17.92 1.79E-01

5

Actual St. 

Thomas 

Sources

STPOWER Point 17 St. Thomas St. Thomas Power Plant

Removed –

now part of 

Group 14

(WPST_23)

6

Other St. 

Croix Sources

CROIX Point 18 St. Croix St. Croix Misc. Aggregated 

Sources 5.21 37.62 2.43 2.43E-02

VBOILER Point 19 St. Croix St. Croix Renaissance Grp Boiler 110.00 68.00 9.80 9.80E-02

St. Croix 

VIWAPA 

BART

WPSX10 Point 20 St. Croix VIWAPA - Boiler 0.6329 0.06329 7.77E-01 7.77E-03 Reported 

WP Emissions (1) SX11 Point 21 St. Croix VIWAPA - Boiler 8.716 8.832 1.056 1.056E-02

St. Croix 

VIWAPA 

nonBART

WPSX16 Point 22 St. Croix VIWAPA - Combustion Turbine 8.543 15.93 1.525 1.525E-02

WPSX17 Point 23 St. Croix VIWAPA - Combustion Turbine 8.467 13.14 1.512 1.512E-02

WPSX19 Point 24 St. Croix VIWAPA - Combustion Turbine 8.001 12.98 2.268 2.268E-02

WPSX20 Point 25 St. Croix VIWAPA - Combustion Turbine 8.089 12.98 2.268 2.268E-02
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 19 AMEC

Group

#

Source 

Group Model ID Type Model ID #

Location Description SO2

(g/s)

NOx

(g/s)

PMF

(g/s)

EC*

(g/s)

Comment

7

Aggregate 

BVI Sources TORTAR Area 1 Tortola

Tortola - BVI Total Combustion 

of Oil as Area Source

(2,500,000 sq. meters) (2)

15.65 4.4 7.28E-01 7.28E-03

8

Simulated 

BVI Sources TORTBU Area 2 Tortola Tortola - Open Burning(10,000 sq. meters) (2) -- 0.416 1.77 1.77E-02

9

St. John 

Roads SJROAD Area 3 St. John

St. John - Paved and Unpaved 

Road Fugitive Emissions

(52,000,000 sq. meters) (2)

-- -- 0.7599 7.599E-03

10 Aggregate St. 

John Burning SJBURN Area 4 St. John

St. John - All Open Burning, 

Forest Fires Etc.

(29,240,000 sq. meters) (2)

8.36E-04 1.39E-04 2.44E-02 2.44E-04

11 St. Johns 

Boilers SJRES Area 5 St. John St. John - Residential Boilers(9,000,000 sq. meters) (2) 4.73E-04 1.06E-01 3.94E-04 3.94E-06

12 St. John Misc. 

Industrial SJMISC Area 6 St. John

St. John - Misc. Industrial 

(Concrete, Construction)

(9,000,000 sq. meters) (2)

-- -- 0.31767 3.18E-03

13 St. John 

Vehicle SJVEH Area 7 St. John

St. John - On Road Motor 

Vehicle Emissions

(52,000,000 sq. meters) (2)

4.63E-02 7.20E-01 0.02112 2.11E-04

14

St. Thomas

WAPA

WPST_23 Point 26 St. Thomas Combustion Turbine 8.966 12.01 3.78 3.78E-02

WPST_22 Point 27 St. Thomas Combustion Turbine 6.564 9.702 2.848 2.848E-02

WPST_18 Point 28 St. Thomas Combustion Turbine 8.656 12.98 6.30E-01 6.30E-03

WPST_15 Point 29 St. Thomas Combustion Turbine 8.417 14.49 6.30E-01 6.30E-03

St. Thomas

WAPA

BARTeligible

WPST_14 Point 30 St. Thomas Combustion Turbine 0.0 0.0 0.0 0.0

Reported 

Emissions (1)

WPST_13 Point 31 St. Thomas Boiler 12.42 8.50 5.37E-01 5.37E-03

WPST_12 Point 32 St. Thomas Combustion Turbine 0.3452 2.685 3.84E-02 3.84E-04

WPST_11 Point 33 St. Thomas Boiler 7.575 6.147 8.06E-01 8.06E-03

St. Thomas

WAPA

WPST_10 Point 34 St. Thomas -- -- -- -- --

WPST_09 Point 35 St. Thomas -- -- -- -- --

15 St. Thomas 

Other Source

STHOSP Point 36 St. Thomas St. Thomas Hospital 0.1100 9.00E-02 1.00E-02 1.00E-04

STOUFF Point 39 St. Thomas Stouffers Hotel 3.640 3.380 0.7400 0.740E-02

FRGENE Point 40 St. Thomas Frenchman’s Reef Generator 0.3200 4.790 0.3400 0.340E-02

FRDIST Point 41 St. Thomas Frenchman’s Reef Distillation 6.020 4.950 0.3600 0.360E-02
Air Quality Modeling in Support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 20 AMEC

Group

#

Source 

Group Model ID Type Model ID #

Location Description SO2

(g/s)

NOx

(g/s)

PMF

(g/s)

EC*

(g/s)

Comment

15 St. Thomas 

Other Sources

ISLRDS Point 42 St. Thomas Islands Road Asphalt 0.4600 2.00E-02 0.1300 0.130E-02

QUARRY_

1

Point 43 St. Thomas Quarry - Crushing/Handling -- -- 8.999E-02 8.999E-04

QUARRY_

2

Area 8 St. Thomas Quarry – Blasting/Drilling

(24,277 sq. meters (2)

-- -- 0.1583 0.1583-02

CONCRT Point 44 St. Thomas Concrete Block Plant -- -- 2.664E-03 2.664E-05

WSB_001 Point 45 St. Thomas Wyndham Sugar Bay Generator 

#1 (1,370 kW) 5.466E-02 2.276 4.219E-02 4.219E-04

WSB_002 Point 46 St. Thomas Wyndham Sugar Bay Generator 

#2 (1,370 kW) 5.466E-02 2.276 4.219E-02 4.219E-04

WSB_003 Point 47 St. Thomas Wyndham Sugar Bay Generator 

#3 (2,000 kW) 5.466E-02 2.276 4.219E-02 4.219E-04

RITZ_E1 Point 48 St. Thomas Ritz Carlton Engine #1 

(1,275 kW) 0.4833 2.278 1.438E-02 1.438E-04

RITZ_E2 Point 49 St. Thomas Ritz Carlton Engine #2 

(1,275 kW) 0.4833 2.278 1.438E-02 1.438E-04

RITZ_E3 Point 50 St. Thomas Ritz Carlton Engine #3 

(1,275 kW) 0.4833 2.278 1.438E-02 1.438E-04

17 St. John 

NonRoad SJNONR Area 9 St. john Nonroad Emissions(52,000,000 sq. meters) (2) 0.5146 0.0595 5.54E-02 5.54E-04 Email of 5/16/2012

g/s – grams/second

(1) St. Croix VIWAPA and St. Thomas VIWAPA BART-eligible sources were modeled with Reported Emissions

(2) Emission rate in the table is expressed in grams/second; area over which the emission rate is modeled is shown in the description; to obtain the emission 

rate input to the model (expressed in g/s/m2), divide the emission rate in the table by the area

* Elemental Carbon is assumed to be 1% of PM emissions
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 21 AMEC

Table 3. Hovensa BART-eligible Heater Inventory

HOVENSA, L.L.C. - St. Croix, VI

greyed out cells shows units that were shut down in early 2011

Blue Font shows what was added or revised by HOVENSA

Source I.D. Unit Description Heat Input Fuel Type Date

mmBTU/hr (Note 1) Constructed SO2 NOx PM10

(tons/yr) (tons/yr) (tons/yr)

H-101 Heater 133.6 RFG, RO 1966 155.5 232.5 19.3

H-104 Heater 99.4 RFG, RO 1966 115.5 172.8 17.2

H-200 Heater 37.2 RFG 1966 8.1 16.0 1.2

H-201 Heater 37.4 RFG 1966 8.2 16.1 1.2

H-202 Heater 121.6 RFG 1966 26.6 146.5 4.0

H-401A Charge Heater 150.7 RFG, RO 1968 197.6 279.1 24.4

H-401B Charge Heater 150.7 RFG, RO 1968 197.6 279.1 24.4

H-401C Charge Heater 150.7 RFG, RO 1968 197.6 279.1 24.4

H-1401A Charge Heater 208.6 RFG, RO 1969 163.1 388.7 21.1

H-1401B Charge Heater 188.2 RFG, RO 1969 155.4 370.2 20.1

H-1500 Reactor Charge Heater 50.8 RFG 1968 13.0 25.5 2.0

H-1501 Fractionator Reboiler Heater 53.5 RFG 1968 13.7 26.8 2.0

H-160 Charge Heater 112.5 RFG 1968 29.6 163.0 4.4

H-600 Unifining Charge Heater 48.1 RFG 1968 11.5 22.5 1.7

H-601 Stripper Reboiler Heater 27.8 RFG 1969 7.8 15.2 1.2

H-602 Platforming Charge Heater 261.9 RFG 1969 62.6 344.4 9.4

H-603 Platforming No.1 Interheater 72 RFG 1969 17.2 33.7 2.6

H-604 Platforming No.2 Interheater 29.1 RFG 1969 8.1 15.9 1.2

H-605 Platforming No.3 Interheater 12 RFG 1969 3.4 6.6 0.5

H-606 Depentanizer Reboiler Heater 49.2 RFG 1969 11.8 23.1 1.8

H-800A Reactor Charge Heater 18.9 RFG 1969 9.4 18.4 1.4

H-800B Reactor Charge Heater 18.9 RFG 1969 9.4 18.4 1.4

H-801 Stripper Heater 79 RFG 1969 22.0 121.1 3.3

H-2101 Charge Heater 190.6 RFG, RO 1972 116.4 283.2 15.1

H-2102 Charge Heater 184.6 RFG, RO 1972 112.7 274.1 14.6

H-2185 Visbreaking Heater 250 RFG 1983 19.4 219.0 110.0

H-2201A Reactor Charge Heater 46.8 RFG 1972 13.4 26.3 2.0

H-2201B Reactor Charge Heater 46.8 RFG 1972 13.4 26.3 2.0

H-2202 Stripper Reboiler Heater 91 RFG 1972 26.1 143.7 3.9

H-2400 Charge Heater 30.3 RFG Apr-73 7.2 14.2 1.1

H-2401 Reboiler Heater 100.8 RFG Apr-73 24.1 132.5 3.6

H-2501 Reboiler Heater 113.6 RFG 1972 44.5 244.5 6.7

H-4502 Benzene Column Reboiler Heater 77.5 RFG Apr-73 32.5 178.9 4.9

H-4503 Toulene Column Reboiler Heater 90.3 RFG Apr-73 30.8 169.6 4.6

H-4504 Xylene Column Reboiler Heater 70.4 RFG Apr-73 27.6 151.9 4.1

H-4505 Raffinate Splitter Reboiler Heater 43.8 RFG Apr-73 23.9 131.3 3.6

H-3101A Crude Charge Heater 309.8 RFG, RO 1971 356.7 507.1 48.1

H-3101B Crude Charge Heater 309.8 RFG, RO 1971 356.7 507.1 48.1

H-4101A Crude Charge Heater 309.2 RFG, RO Apr-73 356.7 507.1 48.1

H-4101B Crude Charge Heater 309.2 RFG, RO Apr-73 356.7 507.1 48.1

H-4401 Charge Heater 127.3 RFG Apr-73 29.4 161.5 4.4

H-4402 Fired Reboiler Heater 77.9 RFG Apr-73 28.0 153.8 4.2

H-4451 Charge Heater 351.6 RFG Apr-73 83.4 458.7 12.5

H-4452 Intermediate Heater 251.2 RFG Apr-73 54.3 298.6 8.1

H-4453 Intermediate Heater 115.6 RFG Apr-73 54.3 298.6 8.1

H-4454 Intermediate Heater 63.3 RFG Apr-73 16.9 33.1 2.5

H-4455 Fired Reboiler Heater 124 RFG Apr-73 30.3 166.6 4.5

H-4201 Prestripper Heater 227.6 RFG, RO Apr-73 367.7 448.1 44.9

H-4202 Vacuum Heater 220.4 RFG, RO Apr-73 355.7 433.6 43.4

H-5401 Charge Heater 114.1 RFG Apr-73 29.4 161.5 4.4

H-5402 Fired Reboiler Heater 78.8 RFG Apr-73 28.0 153.8 4.2

H-5451 Charge Heater 248 RFG Apr-73 83.4 458.7 12.5

H-5452 Intermediate Heater 201.7 RFG Apr-73 54.3 298.6 8.1

H-5453 Intermediate Heater 114.4 RFG Apr-73 54.3 298.6 8.1

H-5454 Intermediate Heater 64.7 RFG Apr-73 16.9 33.1 2.5

H-5455 Fired Reboiler Heater 129.2 RFG Apr-73 30.3 166.6 4.5

H-4601A Reactor Charge Heater 52.1 RFG Apr-73 13.4 26.3 2.0

H-4601B Reactor Charge Heater 52.1 RFG Apr-73 13.4 26.3 2.0

H-4602 Stripper Reboiler Heater 101.3 RFG Apr-73 26.1 143.7 3.9

H-4301A Reactor Charge Heater 47.9 RFG Apr-73 14.6 28.7 2.2

H-4301B Reactor Charge Heater 51.1 RFG Apr-73 14.6 28.7 2.2

H-4302 Stripper Reboiler Heater 135.2 RFG Apr-73 26.7 147.1 4.0

H-5301A Reactor Charge Heater 61.2 RFG Apr-73 14.6 28.7 2.2

H-5301B Reactor Charge Heater 61.2 RFG Apr-73 14.6 28.7 2.2

H-5302 Stripper Reboiler Heater 112 RFG Apr-73 26.7 147.1 4.0

H-4901 Charge Heater ?? ?? 2008

Hydrogen Plant Heater

H-7801 Process Air Heater ?? ?? 1993

H-7802 Converter Heater ?? ?? 1993

R-7801 Startup Heater ?? ?? 1993

H-1061 and (T-1061) Sulfur Recovery Units, Tail gas Treatment ?? ?? 2002

H-4761 and (T-4761) Tail Gas Treatment 10 RFG pre 1976 2 4.0 1.0

H-4745 Tail Gas Incinerator 55 RFG pre 1976 900 28.0 3.0

H-3413 Duct Burner ?? ?? 2009

H-1032 Tail Gas Incinerator 7.2 RFG pre 1976 1.6 3.1 0.2

H-1042 Tail Gas Incinerator 15.2 RFG pre 1976 3.3 6.5 0.5

Regional Haze - BART Source Inventory - HEATERS

Unit was never constructed

Potential To Emit (PTE), tons per year
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 22 AMEC

3. RECEPTOR NETWORK

The National Park Service (NPS) has developed a database of modeling receptors for all Class 

I areas in the United States and the Virgin Islands. For the Virgin Island Class I area, 74 

receptors are defined with an additional receptor on Hassel Island. Since this receptor network

does not allow for examination of single source contributions, an additional receptor located at 

the IMPROVE monitor site was modeled, allowing calculations of source contributions at the 

IMPROVE site. The NPS receptor set was downloaded from the NPS website 

(http://www.nature.nps.gov/air/maps/receptors/index.cfm) and converted to the Lambert 

Conformal Conic (NAD83, km) for the modeling. Figure 2 shows the receptor network.

Figure 2. Location of Class I Receptors for VI National Park

4. MODEL RESULTS

The modeling results at the IMPROVE receptor with all sources modeled for each year 2007 

through 2010 are shown in Table 2. The average annual visibility parameters for all days in the 

year, the 8

th high values (98th percentile), and the average of the best 20% days and worst 20% 

days based on the percent change of the total beta extinction over the background beta 

extinction are presented. 

2020

2022

2024

2026

2028

2030

2032

2034

2036

2038

293 298 303 308 313 318

U

T

M

N

orthing (km)

UTM Easting (km

Receptors
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 23 AMEC

For the model results with BART-eligible sources, the average of the best 20% days is omitted 

since not all days during the year resulted in visibility impacts (Tables 10 and later). In these 

tables, the number of days with non-zero visibility impacts is noted in parenthesis after the year 

for the annual average and the worst 20% days.

The following table briefly describes the tables of results that follow.

Tables Description

4-6 All sources for 2007-2010 with emissions for BART-eligible sources modeled

7-9 All sources for 2007-2010 with BART-eligible sources and emission reductions: 

Hovensa Consent Decree and marine vessel reductions

10-11 Hovensa BART-eligible sources, 2007-2010 (Group 1)

12-13 Hovensa BART-eligible + nonBART sources, 2007-2010

14-15 St. Thomas WAPA BART-eligible sources, 2007-2010 (Group 14b)

16-17 St. Thomas WAPA BART-eligible + nonBART sources, 2007-2010 (Group 14d)

18-19 St. Thomas WAPA BART-eligible + nonBART + other St. Thomas sources, 

2007-2010 (Group 14e)

20-21 St. Croix WAPA BART-eligible sources, 2007-2010 (Group 6b)

22-23 St. Croix WAPA BART-eligible + nonBART sources, 2007-2010 (Group 6d)

24-25 St. John point sources, 2007-2010 (Group 2)

26-27 St. John marine vessel sources (ferry, cargo, cruise), 2007-2010 (Group 3) – no 

emissions reductions

28-29 St. John marine vessel sources (ferry, cargo, cruise), 2007-2010 (Group 3alt) –

with emissions reductions as described above

30-31 Puerto Rico surrogate power plant, 2009 only (Group 4)

32-33 British Virgin Islands oil combustion, 2009 only (Group 7)

34-35 British Virgin Islands burning, 2009 only (Group 8)

36-37 St. John fugitive road dust, 2007-2010 (Group 9)

38-39 St. John burning, 2007-2010 (Group 10)

40-41 St. John boilers, 2007-2010 (Group 11)

42-43 St. John misc. industrial/construction, 2007-2010 (Group 12);

also includes results for an alternate size area source for 2009 only

44-45 St. John onroad (motor vehicles), 2007-2010 (Group 13)

46-47 St. John nonroad, 2007-2010 (Group 17)

Following Table 6 are plots of the modeled daily visibility impacts from all sources (without 

reductions) at the IMPROVE site (Figures 3, 5, 7, and 9) and Hassel Island site (Figures 4, 6, 8, 
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 24 AMEC

and 10). The letter ‘B’ above a column corresponds to “Best 20%” day and the letter ‘W’ 

corresponds to a “Worst 20%” day.

Note that the scale for the y-axis (beta extinction) varies from figure-to-figure. Also note that for 

some days, the bar extends above the top of the y-axis. On those days, the beta extinction is

denoted in parentheses next to the bar.
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 25 AMEC

Table 4. IMPROVE Site Receptor - Model Results for All Sources, No Reductions

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 

Annual Average 8.17 15.66 23.84 52.16 0.79 0.14 -- 0.66 -- 6.58 -- 8.43 4.49 3.94

2007

98th percentile 27.09 15.63 42.77 173.70 7.38 0.22 -- 1.77 -- 17.72 -- 14.53 4.46 10.07

2007

Best 20% Days 2.68 15.64 18.33 17.16 0.08 0.00 -- 0.24 -- 2.36 -- 6.05 4.47 1.58

2007 

Worst 20% Days 17.56 15.67 33.25 112.23 3.11 0.63 -- 1.26 -- 12.57 -- 11.86 4.49 7.38

2008

Annual Average 5.50 15.66 21.16 35.06 0.28 0.05 -- 0.47 -- 4.69 -- 7.40 4.49 2.91

2008

98th percentile 15.29 15.85 31.15 96.52 1.55 0.98 -- 1.16 -- 11.60 -- 11.36 4.61 6.76

2008

Best 20% Days 2.80 15.62 18.42 17.95 0.05 0.00 -- 0.25 -- 2.50 -- 6.11 4.46 1.65

2008

Worst 20% Days 10.74 15.71 26.46 68.39 1.06 0.21 -- 0.86 -- 8.61 -- 9.65 4.52 5.14

2009

Annual Average 5.96 15.66 21.63 38.04 0.41 0.07 -- 0.50 -- 4.98 -- 7.56 4.49 3.07

2009

98th percentile 23.43 15.85 39.32 148.07 6.08 0.58 -- 1.53 -- 15.25 -- 13.69 4.61 9.09

2009

Best 20% Days 2.89 15.62 18.51 18.49 0.04 0.00 -- 0.26 -- 2.59 -- 6.15 4.46 1.70

2009

Worst 20% Days 12.55 15.70 28.25 79.96 1.78 0.33 -- 0.95 -- 9.49 -- 10.19 4.51 5.68

2010

Annual Average 4.71 15.66 20.37 30.03 0.51 0.11 -- 0.37 -- 3.72 -- 7.04 4.49 2.55

2010

98th percentile 14.95 15.85 30.84 94.58 3.92 5.06 -- 0.54 -- 5.44 -- 11.26 4.61 6.66

2010

Best 20% Days 2.95 15.58 18.53 18.95 0.01 0.00 -- 0.27 -- 2.67 -- 6.17 4.43 1.73

2010

Worst 20% Days 8.84 15.70 24.55 56.39 2.33 0.51 -- 0.55 -- 5.46 -- 8.85 4.51 4.35
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 26 AMEC

Table 5. Hassel Island NPS Receptor - Model Results for All Sources, No Reductions

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 

Annual Average 2.91 15.66 18.58 18.59 1.11 0.16 -- 0.15 -- 1.49 -- 6.10 4.49 1.62

2007

98th percentile 12.60 15.81 28.48 80.10 8.86 0.61 -- 0.29 -- 2.85 -- 10.46 4.58 5.88

2007

Best 20% Days 0.75 15.65 16.40 4.79 0.20 0.01 -- 0.05 -- 0.49 -- 4.94 4.48 0.47

2007 

Worst 20% Days 6.91 15.67 22.61 44.23 3.82 0.64 -- 0.22 -- 2.23 -- 8.03 4.49 3.54

2008

Annual Average 2.04 15.66 17.71 13.06 0.56 0.09 -- 0.13 -- 1.26 -- 5.69 4.49 1.20

2008

98th percentile 5.68 15.76 21.47 36.27 4.26 0.12 -- 0.12 -- 1.19 -- 7.64 4.55 3.09

2008

Best 20% Days 0.70 15.65 16.35 4.48 0.21 0.02 -- 0.04 -- 0.43 -- 4.92 4.48 0.44

2008

Worst 20% Days 4.11 15.72 19.84 26.18 1.38 0.32 -- 0.22 -- 2.19 -- 6.82 4.52 2.29

2009

Annual Average 2.16 15.66 17.83 13.81 0.63 0.07 -- 0.13 -- 1.32 -- 5.73 4.49 1.25

2009

98th percentile 8.05 15.47 23.56 52.36 5.92 1.24 -- 0.08 -- 0.81 -- 8.57 4.36 4.21

2009

Best 20% Days 0.44 15.67 16.10 2.79 0.08 0.01 -- 0.03 -- 0.32 -- 4.76 4.49 0.27

2009

Worst 20% Days 4.83 15.70 20.54 30.85 2.03 0.27 -- 0.23 -- 2.30 -- 7.13 4.51 2.62

2010

Annual Average 5.47 15.66 21.15 35.02 1.48 0.27 -- 0.34 -- 3.38 -- 7.37 4.49 2.89

2010

98th percentile 16.22 15.63 31.92 104.23 9.91 0.60 -- 0.52 -- 5.19 -- 11.61 4.46 7.14

2010

Best 20% Days 1.83 15.70 17.53 11.66 0.54 0.06 -- 0.11 -- 1.12 -- 5.60 4.51 1.09

2010

Worst 20% Days 10.48 15.68 26.20 67.00 4.38 0.97 -- 0.47 -- 4.67 -- 9.50 4.50 5.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 27 AMEC

Table 6. NPS Receptors on St. John – Model Results for All Sources, No Reductions

St. John NPS BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 

Annual Average 19.67 15.66 35.34 125.58 0.86 0.15 -- 1.70 -- 16.96 -- 12.50 4.49 8.01

2007

98th percentile 34.86 15.63 50.55 223.47 8.05 2.74 -- 2.19 -- 21.88 -- 16.20 4.46 11.74

2007

Best 20% Days 13.09 15.64 28.72 83.68 0.12 0.01 -- 1.18 -- 11.78 -- 10.51 4.47 6.05

2007 

Worst 20% Days 28.15 15.69 43.86 179.48 3.05 0.65 -- 2.22 -- 22.22 -- 14.71 4.50 10.20

2008

Annual Average 20.44 15.66 36.10 130.47 0.34 0.06 -- 1.82 -- 18.22 -- 12.73 4.49 8.24

2008

98th percentile 33.62 15.60 49.22 215.56 0.07 0.00 -- 3.05 -- 30.50 -- 15.94 4.44 11.49

2008

Best 20% Days 14.48 15.64 30.11 92.58 0.19 0.02 -- 1.30 -- 12.97 -- 11.01 4.47 6.55

2008

Worst 20% Days 29.51 15.67 45.19 188.37 0.66 0.17 -- 2.61 -- 26.07 -- 15.05 4.49 10.56

2009

Annual Average 18.87 15.66 34.53 120.44 0.46 0.08 -- 1.67 -- 16.66 -- 12.31 4.49 7.82

2009

98th percentile 34.40 15.72 50.13 218.80 0.93 0.06 -- 3.04 -- 30.37 -- 16.12 4.53 11.59

2009

Best 20% Days 13.86 15.61 29.48 88.76 0.10 0.01 -- 1.25 -- 12.50 -- 10.80 4.46 6.34

2009

Worst 20% Days 25.88 15.71 41.60 164.76 1.51 0.28 -- 2.19 -- 21.89 -- 14.18 4.52 9.67

2010

Annual Average 21.92 15.66 37.59 139.86 0.51 0.13 -- 1.93 -- 19.35 -- 13.08 4.49 8.60

2010

98th percentile 40.51 15.76 56.27 257.14 0.08 0.02 -- 3.67 -- 36.74 -- 17.28 4.55 12.73

2010

Best 20% Days 14.50 15.60 30.10 92.99 0.12 0.01 -- 1.31 -- 13.07 -- 11.01 4.45 6.56

2010

Worst 20% Days 32.92 15.73 48.67 209.31 1.46 0.54 -- 2.81 -- 28.11 -- 15.77 4.53 11.24
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 28 AMEC

Figure 3. Modeled Beta Extinction – All Sources, No Reductions – IMPROVE Site Receptor, 2007
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 29 AMEC

Figure 4. Modeled Beta Extinction – All Sources, No Reductions – Hassel Island NPS Receptor, 2007
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 30 AMEC

Figure 5. Modeled Beta Extinction – All Sources, No Reductions – IMPROVE Site Receptor, 2008
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 31 AMEC

Figure 6. Modeled Beta Extinction – All Sources, No Reductions – Hassel Island NPS Receptor, 2008
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Final Modeling for Visibility Reduction

Project No.: 6480110234

Figure 7. Modeled Beta Extinction – All Sources, No Reductio

Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Page 32

ns – IMPROVE Site Receptor, 2009

June 2012

AMEC
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Final Modeling for Visibility Reduction

Project No.: 6480110234

Figure 8. Modeled Beta Extinction – All Sources, No Reductions 

Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Page 33

– Hassel Island NPS Receptor, 2009

June 2012

AMEC
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Final Modeling for Visibility Reduction

Project No.: 6480110234

Figure 9. Modeled Beta Extinction – All Sources, No Reductio

Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Page 34

ns – IMPROVE Site Receptor, 2010

June 2012

AMEC
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Final Modeling for Visibility Reduction

Project No.: 6480110234

Figure 10. Modeled Beta Extinction – All Sources, No Reductions 

Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands:

Page 35

– Hassel Island NPS Receptor, 2010

June 2012

AMEC
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 36 AMEC

Table 7. IMPROVE Site Receptor - Model Results for All Sources, with Reductions

IMPROVE BEXT

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 

Annual Average 7.99 15.66 23.65 51.00 0.65 0.12 -- 0.66 -- 6.56 -- 8.37 4.49 3.89

2007

98th percentile 25.41 15.63 41.08 162.89 6.86 0.23 -- 1.67 -- 16.66 -- 14.13 4.46 9.67

2007

Best 20% Days 2.68 15.64 18.33 17.16 0.08 0.00 -- 0.24 -- 2.36 -- 6.05 4.47 1.58

2007 

Worst 20% Days 16.79 15.67 32.47 107.25 2.48 0.53 -- 1.25 -- 12.53 -- 11.65 4.49 7.16

2008

Annual Average 5.44 15.66 21.10 34.71 0.24 0.05 -- 0.47 -- 4.68 -- 7.38 4.49 2.89

2008

98th percentile 14.92 15.85 30.79 94.21 1.30 0.87 -- 1.16 -- 11.60 -- 11.24 4.61 6.64

2008

Best 20% Days 2.80 15.62 18.42 17.95 0.05 0.00 -- 0.25 -- 2.50 -- 6.11 4.46 1.65

2008

Worst 20% Days 10.46 15.71 26.18 66.63 0.87 0.18 -- 0.86 -- 8.55 -- 9.56 4.52 5.04

2009

Annual Average 5.87 15.66 21.54 37.46 0.34 0.06 -- 0.50 -- 4.97 -- 7.53 4.49 3.04

2009

98th percentile 21.76 15.72 37.52 138.63 5.32 1.38 -- 1.37 -- 13.69 -- 13.22 4.53 8.70

2009

Best 20% Days 2.89 15.62 18.51 18.49 0.04 0.00 -- 0.26 -- 2.59 -- 6.15 4.46 1.70

2009

Worst 20% Days 12.11 15.70 27.81 77.14 1.42 0.28 -- 0.95 -- 9.47 -- 10.06 4.51 5.56

2010

Annual Average 4.59 15.66 20.26 29.30 0.41 0.09 -- 0.37 -- 3.71 -- 6.99 4.49 2.51

2010

98th percentile 13.37 15.85 29.26 84.58 3.10 4.30 -- 0.54 -- 5.43 -- 10.74 4.61 6.13

2010

Best 20% Days 2.95 15.58 18.53 18.94 0.01 0.00 -- 0.27 -- 2.67 -- 6.17 4.43 1.73

2010

Worst 20% Days 8.30 15.70 24.01 52.93 1.87 0.44 -- 0.55 -- 5.45 -- 8.65 4.51 4.14
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 37 AMEC

Table 8. Hassel Island NPS Receptor - Model Results for All Sources, with Reductions

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 

Annual Average 2.62 15.66 18.29 16.74 0.88 0.13 -- 0.15 -- 1.46 -- 5.97 4.49 1.48

2007

98th percentile 10.20 15.81 26.05 64.78 6.17 0.95 -- 0.28 -- 2.80 -- 9.58 4.58 4.99

2007

Best 20% Days 0.73 15.64 16.37 4.65 0.18 0.01 -- 0.05 -- 0.48 -- 4.93 4.47 0.45

2007 

Worst 20% Days 5.93 15.67 21.62 37.92 2.97 0.53 -- 0.22 -- 2.21 -- 7.62 4.49 3.13

2008

Annual Average 1.91 15.66 17.57 12.19 0.46 0.08 -- 0.12 -- 1.24 -- 5.62 4.49 1.13

2008

98th percentile 4.80 15.81 20.62 30.39 0.70 0.59 -- 0.32 -- 3.19 -- 7.23 4.58 2.65

2008

Best 20% Days 0.68 15.65 16.33 4.34 0.20 0.02 -- 0.04 -- 0.42 -- 4.90 4.48 0.42

2008

Worst 20% Days 3.72 15.71 19.44 23.70 1.05 0.26 -- 0.22 -- 2.19 -- 6.62 4.52 2.11

2009

Annual Average 2.00 15.66 17.67 12.78 0.51 0.06 -- 0.13 -- 1.30 -- 5.65 4.49 1.17

2009

98th percentile 6.72 15.72 22.48 42.96 4.25 0.43 -- 0.19 -- 1.86 -- 8.10 4.53 3.57

2009

Best 20% Days 0.42 15.67 16.09 2.70 0.07 0.01 -- 0.03 -- 0.31 -- 4.75 4.49 0.26

2009

Worst 20% Days 4.34 15.70 20.04 27.68 1.50 0.21 -- 0.24 -- 2.39 -- 6.91 4.51 2.40

2010

Annual Average 4.88 15.66 20.55 31.19 1.07 0.22 -- 0.33 -- 3.26 -- 7.11 4.49 2.62

2010

98th percentile 14.05 15.63 29.74 90.30 7.85 0.51 -- 0.52 -- 5.17 -- 10.90 4.46 6.43

2010

Best 20% Days 1.58 15.70 17.28 10.09 0.41 0.05 -- 0.10 -- 1.03 -- 5.47 4.51 0.95

2010

Worst 20% Days 9.25 15.68 24.96 59.11 3.29 0.80 -- 0.47 -- 4.69 -- 9.05 4.50 4.55
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 38 AMEC

Table 9. NPS Receptors on St. John – Model Results for All Sources, with Reductions

St. John NPS BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007 

Annual Average 19.50 15.66 35.16 124.47 0.71 0.13 -- 1.70 -- 16.96 -- 12.46 4.49 7.97

2007

98th percentile 33.74 15.81 49.56 213.46 1.52 0.13 -- 2.92 -- 29.17 -- 16.01 4.58 11.42

2007

Best 20% Days 13.08 15.64 28.71 83.62 0.11 0.01 -- 1.18 -- 11.78 -- 10.51 13.08 15.64

2007 

Worst 20% Days 27.51 15.70 43.22 175.34 2.43 0.52 -- 2.23 -- 22.33 -- 14.58 4.51 10.07

2008

Annual Average 20.38 15.66 36.05 130.13 0.30 0.05 -- 1.82 -- 18.21 -- 12.72 4.49 8.23

2008

98th percentile 33.62 15.60 49.22 215.56 0.07 0.00 -- 3.05 -- 30.50 -- 15.94 4.44 11.49

2008

Best 20% Days 14.43 15.63 30.06 92.31 0.18 0.02 -- 1.29 -- 12.94 -- 11.00 4.47 6.53

2008

Worst 20% Days 29.42 15.67 45.10 187.81 0.50 0.14 -- 2.62 -- 26.16 -- 15.03 4.49 10.54

2009

Annual Average 18.79 15.66 34.45 119.91 0.38 0.07 -- 1.67 -- 16.67 -- 12.29 4.49 7.80

2009

98th percentile 33.83 15.72 49.63 215.60 10.11 1.07 -- 2.06 -- 20.59 -- 16.02 4.53 11.49

2009

Best 20% Days 13.85 15.61 29.47 88.72 0.11 0.01 -- 1.25 -- 12.49 -- 10.79 4.46 6.34

2009

Worst 20% Days 25.57 15.72 41.29 162.75 1.23 0.24 -- 2.19 -- 21.91 -- 14.12 4.52 9.60

2010

Annual Average 21.82 15.66 37.48 139.19 0.42 0.11 -- 1.94 -- 19.35 -- 13.06 4.49 8.58

2010

98th percentile 40.51 15.76 56.27 257.13 0.08 0.02 -- 3.67 -- 36.74 -- 17.28 4.55 12.73

2010

Best 20% Days 14.48 15.60 30.08 92.85 0.11 0.01 -- 1.31 -- 13.05 -- 11.00 4.45 6.56

2010

Worst 20% Days 32.59 15.73 48.33 207.15 1.17 0.47 -- 2.81 -- 28.14 -- 15.70 4.53 11.17
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 39 AMEC

Table 10. IMPROVE Site Receptor – Group 1 – Model Results for Hovensa BART-eligible Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.45 15.66 16.11 2.87 0.32 0.08 -- 0.00 -- 0.04 -- 4.74 4.49 0.25

2007

98th percentile 4.60 15.63 20.26 29.65 3.93 0.15 -- 0.05 -- 0.48 -- 7.06 4.46 2.60

2007 (73)

Worst 20% Days 2.21 15.67 17.89 14.15 1.59 0.40 -- 0.02 -- 0.20 -- 5.73 4.49 1.24

2008

Annual Average 0.12 15.66 15.78 0.77 0.09 0.02 -- 0.00 -- 0.01 -- 4.56 4.49 0.07

2008

98th percentile 1.64 15.75 17.41 10.48 1.43 0.06 -- 0.01 -- 0.14 -- 5.54 4.55 1.00

2008 (68)

Worst 20% Days 0.60 14.63 15.23 3.84 0.44 0.09 -- 0.01 -- 0.06 -- 4.57 4.20 0.36

2009

Annual Average 0.23 15.66 15.89 1.47 0.17 0.04 -- 0.00 -- 0.02 -- 4.62 4.49 0.13

2009

98th percentile 3.60 15.85 19.47 22.84 2.86 0.26 -- 0.04 -- 0.44 -- 6.66 4.61 2.06

2009 (68)

Worst 20% Days 1.15 14.62 15.78 7.36 0.85 0.19 -- 0.01 -- 0.10 -- 4.87 4.20 0.67

2010

Annual Average 0.35 15.66 16.02 2.27 0.25 0.07 -- 0.00 -- 0.04 -- 4.69 4.49 0.20

2010

98th percentile 3.38 15.63 19.03 21.77 2.74 0.18 -- 0.04 -- 0.42 -- 6.43 4.46 1.97

2010 (73)

Worst 20% Days 1.75 15.64 17.40 11.20 1.22 0.34 -- 0.02 -- 0.17 -- 5.48 4.47 1.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 40 AMEC

Table 11. Hassel Island NPS Receptor – Group 1 – Model Results for Hovensa BART-eligible Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.52 15.66 16.19 3.35 0.39 0.08 -- 0.01 -- 0.05 -- 4.79 4.49 0.30

2007

98th percentile 5.04 15.58 20.65 32.54 2.88 1.93 -- 0.02 -- 0.21 -- 7.25 4.44 2.82

2007 (73)

Worst 20% Days 2.47 15.67 18.16 15.82 1.82 0.40 -- 0.02 -- 0.23 -- 5.90 4.49 1.41

2008

Annual Average 0.19 15.66 15.85 1.19 0.13 0.03 -- 0.00 -- 0.02 -- 4.60 4.49 0.11

2008

98th percentile 2.63 15.81 18.46 16.74 1.99 0.54 -- 0.01 -- 0.10 -- 6.13 4.58 1.55

2008 (73)

Worst 20% Days 0.93 15.70 16.63 5.93 0.67 0.16 -- 0.01 -- 0.09 -- 5.07 4.51 0.56

2009

Annual Average 0.27 15.66 15.94 1.76 0.21 0.03 -- 0.00 -- 0.03 -- 4.65 4.49 0.16

2009

98th percentile 3.30 15.72 19.04 21.09 2.68 0.22 -- 0.04 -- 0.37 -- 6.44 4.53 1.91

2009 (73)

Worst 20% Days 1.37 15.70 17.08 8.78 1.05 0.17 -- 0.01 -- 0.13 -- 5.31 4.51 0.80

2010

Annual Average 0.63 15.66 16.30 4.05 0.46 0.10 -- 0.01 -- 0.07 -- 4.85 4.49 0.36

2010

98th percentile 5.78 15.85 21.65 36.57 1.83 3.82 -- 0.01 -- 0.11 -- 7.72 4.61 3.12

2010 (73)

Worst 20% Days 2.94 15.64 18.60 18.87 2.13 0.49 -- 0.03 -- 0.30 -- 6.14 4.47 1.67
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 41 AMEC

Table 12. IMPROVE Site Receptor – Group 1 – Model Results for Hovensa (BART + nonBART) Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.59 15.66 16.26 3.78 0.41 0.09 -- 0.01 -- 0.08 -- 4.81 4.49 0.32

2007

98th percentile 6.15 15.63 21.82 39.59 4.96 0.18 -- 0.09 -- 0.92 -- 7.80 4.46 3.34

2007 (73)

Worst 20% Days 2.93 15.67 18.61 18.75 2.03 0.47 -- 0.04 -- 0.39 -- 6.09 4.49 1.60

2008

Annual Average 0.16 15.66 15.82 1.02 0.11 0.02 -- 0.00 -- 0.02 -- 4.58 4.49 0.10

2008

98th percentile 2.23 15.63 17.87 14.32 1.49 0.11 -- 0.06 -- 0.57 -- 5.80 4.46 1.34

2008 (70)

Worst 20% Days 0.80 15.06 15.86 5.10 0.56 0.10 -- 0.01 -- 0.12 -- 4.81 4.33 0.48

2009

Annual Average 0.31 15.66 15.97 1.96 0.22 0.05 -- 0.00 -- 0.04 -- 4.66 4.49 0.17

2009

98th percentile 4.87 15.85 20.74 30.86 3.61 0.31 -- 0.09 -- 0.86 -- 7.30 4.61 2.69

2009 (69)

Worst 20% Days 1.53 14.84 16.38 9.81 1.09 0.23 -- 0.02 -- 0.20 -- 5.13 4.26 0.87

2010

Annual Average 0.47 15.66 16.13 3.00 0.31 0.08 -- 0.01 -- 0.07 -- 4.75 4.49 0.26

2010

98th percentile 4.64 15.63 20.30 29.89 3.52 0.21 -- 0.08 -- 0.84 -- 7.08 4.46 2.61

2010 (73)

Worst 20% Days 2.32 15.64 17.98 14.88 1.55 0.39 -- 0.03 -- 0.34 -- 5.77 4.47 1.30
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 42 AMEC

Table 13. Hassel Island NPS Receptor – Group 1 – Model Results for Hovensa (BART + nonBART) Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.69 15.66 16.36 4.42 0.49 0.10 -- 0.01 -- 0.10 -- 4.87 4.49 0.39

2007

98th percentile 6.85 15.60 22.48 44.12 4.68 0.77 -- 0.13 -- 1.27 -- 8.10 4.44 3.65

2007 (73)

Worst 20% Days 3.28 15.67 18.97 20.99 2.31 0.47 -- 0.05 -- 0.46 -- 6.31 4.49 1.81

2008

Annual Average 0.25 15.66 15.91 1.57 0.17 0.04 -- 0.00 -- 0.03 -- 4.63 4.49 0.15

2008

98th percentile 3.36 15.81 19.19 21.36 2.52 0.63 -- 0.02 -- 0.19 -- 6.52 4.58 1.94

2008 (73)

Worst 20% Days 1.23 15.70 16.93 7.85 0.85 0.19 -- 0.02 -- 0.17 -- 5.24 4.51 0.73

2009

Annual Average 0.37 15.66 16.03 2.34 0.27 0.04 -- 0.01 -- 0.05 -- 4.69 4.49 0.21

2009

98th percentile 4.41 15.72 20.16 28.20 3.37 0.25 -- 0.07 -- 0.71 -- 7.01 4.53 2.48

2009 (73)

Worst 20% Days 1.84 15.70 17.55 11.77 1.34 0.20 -- 0.03 -- 0.26 -- 5.56 4.51 1.05

2010

Annual Average 0.84 15.66 16.51 5.40 0.58 0.12 -- 0.01 -- 0.13 -- 4.95 4.49 0.47

2010

98th percentile 7.32 15.81 23.17 46.55 5.13 0.70 -- 0.14 -- 1.36 -- 8.40 4.58 3.82

2010 (73)

Worst 20% Days 3.92 15.64 19.58 25.12 2.71 0.57 -- 0.06 -- 0.58 -- 6.62 4.47 2.15
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 43 AMEC

Table 14. IMPROVE Site Receptor – Group 14a – Model Results for St. Thomas WAPA BART-eligible Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.009 15.66 15.67 0.06 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2007

98th percentile 0.15 15.47 15.61 0.95 0.12 0.00 -- 0.00 -- 0.02 -- 4.46 4.36 0.09

2007 (47)

Worst 20% Days 0.045 10.09 10.14 0.29 0.04 0.00 -- 0.00 -- 0.00 -- 2.92 2.89 0.03

2008

Annual Average 0.006 15.66 15.67 0.04 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2008

98th percentile 0.10 15.63 15.73 0.66 0.08 0.00 -- 0.00 -- 0.02 -- 4.53 4.46 0.07

2008 (23)

Worst 20% Days 0.03 4.95 4.98 0.18 0.02 0.00 -- 0.00 -- 0.00 -- 1.44 1.43 0.02

2009

Annual Average 0.006 15.66 15.67 0.04 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.12 15.72 15.84 0.75 0.10 0.00 -- 0.00 -- 0.01 -- 4.60 4.53 0.07

2009 (21)

Worst 20% Days 0.03 4.51 4.54 0.19 0.02 0.00 -- 0.00 -- 0.00 -- 1.31 1.29 0.02

2010

Annual Average 0.001 15.66 15.66 0.01 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.01 15.85 15.86 0.05 0.01 0.00 -- 0.00 -- 0.00 -- 4.61 4.61 0.00

2010 (26)

Worst 20% Days 0.01 5.60 5.60 0.04 0.01 0.00 -- 0.00 -- 0.00 -- 1.61 1.61 0.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 44 AMEC

Table 15. Hassel Island NPS Receptor – Group 14a – Model Results for St. Thomas WAPA BART-eligible Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.009 15.66 15.67 0.06 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2007

98th percentile 0.15 15.47 15.61 0.95 0.12 0.00 -- 0.00 -- 0.02 -- 4.46 4.36 0.09

2007 (47)

Worst 20% Days 0.05 10.09 10.14 0.29 0.04 0.00 -- 0.00 -- 0.00 -- 2.92 2.89 0.03

2008

Annual Average 0.003 15.66 15.67 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2008

98th percentile 0.05 15.60 15.65 0.30 0.04 0.00 -- 0.00 -- 0.01 -- 4.48 4.45 0.03

2008 (27)

Worst 20% Days 0.02 5.81 5.82 0.10 0.01 0.00 -- 0.00 -- 0.00 -- 1.68 1.67 0.01

2009

Annual Average 0.002 15.66 15.66 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.02 15.55 15.58 0.16 0.02 0.00 -- 0.00 -- 0.00 -- 4.43 4.42 0.02

2009 (29)

Worst 20% Days 0.01 6.23 6.24 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 1.79 1.78 0.01

2010

Annual Average 0.002 15.66 15.66 0.02 0.00 0.000 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.02 15.72 15.75 0.16 0.01 0.01 -- 0.00 -- 0.00 -- 4.54 4.53 0.02

2010 (34)

Worst 20% Days 0.01 7.31 7.33 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 2.11 2.10 0.01
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 45 AMEC

Table 16. IMPROVE Site Receptor – Group 14d – Model Results for St. Thomas WAPA (BART + nonBART) Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.021 15.66 15.68 0.14 0.02 0.00 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2007

98th percentile 0.33 15.76 16.08 2.08 0.23 0.00 -- 0.01 -- 0.08 -- 4.75 4.55 0.21

2007 (40)

Worst 20% Days 0.11 8.59 8.70 0.68 0.08 0.01 -- 0.00 -- 0.02 -- 2.53 2.46 0.07

2008

Annual Average 0.012 15.66 15.67 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2008

98th percentile 0.22 15.58 15.80 1.43 0.17 0.01 -- 0.00 -- 0.04 -- 4.58 4.44 0.14

2008 (25)

Worst 20% Days 0.06 5.38 5.45 0.39 0.04 0.01 -- 0.00 -- 0.01 -- 1.59 1.55 0.04

2009

Annual Average 0.012 15.66 15.67 0.07 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2009

98th percentile 0.20 15.55 15.75 1.27 0.11 0.00 -- 0.01 -- 0.07 -- 4.54 4.42 0.13

2009 (21)

Worst 20% Days 0.06 4.94 5.00 0.37 0.04 0.00 -- 0.00 -- 0.01 -- 1.45 1.42 0.04

2010

Annual Average 0.003 15.66 15.66 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.02 15.85 15.87 0.11 0.01 0.00 -- 0.00 -- 0.00 -- 4.62 4.61 0.01

2010 (31)

Worst 20% Days 0.01 6.67 6.68 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 1.92 1.92 0.01
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 46 AMEC

Table 17. Hassel Island NPS Receptor – Group 14d – Model Results for St. Thomas WAPA (BART + nonBART) Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.018 15.66 15.68 0.12 0.01 0.00 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2007

98th percentile 0.26 15.76 16.02 1.68 0.21 0.00 -- 0.01 -- 0.05 -- 4.71 4.55 0.17

2007 (50)

Worst 20% Days 0.09 10.73 10.83 0.58 0.07 0.00 -- 0.00 -- 0.02 -- 3.13 3.08 0.06

2008

Annual Average 0.012 15.66 15.67 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2008

98th percentile 0.22 15.58 15.80 1.43 0.17 0.01 -- 0.00 -- 0.04 -- 4.58 4.44 0.14

2008 (25)

Worst 20% Days 0.06 5.38 5.45 0.39 0.04 0.01 -- 0.00 -- 0.01 -- 1.59 1.55 0.04

2009

Annual Average 0.005 15.66 15.67 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.06 15.55 15.61 0.37 0.04 0.00 -- 0.00 -- 0.01 -- 4.45 4.42 0.04

2009 (21)

Worst 20% Days 0.03 6.66 6.69 0.17 0.02 0.00 -- 0.00 -- 0.00 -- 1.93 1.91 0.02

2010

Annual Average 0.006 15.66 15.67 0.04 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.06 15.72 15.78 0.38 0.03 0.03 -- 0.00 -- 0.00 -- 4.56 4.53 0.04

2010 (38)

Worst 20% Days 0.03 8.17 8.20 0.18 0.02 0.00 -- 0.00 -- 0.00 -- 2.37 2.35 0.02
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 47 AMEC

Table 18. IMPROVE Site Receptor – Group 14e – Model Results for St. Thomas WAPA (BART + nonBART) + Other St. 

Thomas Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.07 15.66 15.73 0.43 0.03 0.01 0.00 0.00 0.00 0.03 0.00 4.53 4.49 0.04

2007

98th percentile 0.99 15.58 16.57 6.35 0.40 0.03 0.00 0.05 0.00 0.51 0.00 5.05 4.44 0.62

2007 (58)

Worst 20% Days 0.33 12.45 12.79 2.13 0.16 0.03 0.00 0.01 0.00 0.13 0.00 3.77 3.57 0.20

2008

Annual Average 0.04 15.66 15.70 0.23 0.02 0.01 0.00 0.00 0.00 0.01 0.00 4.51 4.49 0.02

2008

98th percentile 0.60 15.81 16.41 3.81 0.17 0.01 0.00 0.04 0.00 0.38 0.00 4.95 4.58 0.37

2008 (31)

Worst 20% Days 0.18 6.67 6.86 1.16 0.08 0.03 0.00 0.01 0.00 0.07 0.00 2.03 1.92 0.11

2009

Annual Average 0.04 15.66 15.70 0.23 0.02 0.00 0.00 0.00 0.00 0.01 0.00 4.51 4.49 0.02

2009

98th percentile 0.79 15.85 16.64 4.99 0.51 0.06 0.00 0.02 0.00 0.20 0.00 5.09 4.61 0.49

2009 (33)

Worst 20% Days 0.18 7.09 7.27 1.16 0.09 0.02 0.00 0.01 0.00 0.06 0.00 2.15 2.04 0.11

2010

Annual Average 0.004 15.66 15.67 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.49 4.49 0.00

2010

98th percentile 0.03 15.63 15.66 0.18 0.02 0.00 0.00 0.00 0.00 0.00 0.00 4.48 4.46 0.02

2010 (36)

Worst 20% Days 0.02 7.75 7.77 0.14 0.02 0.00 0.00 0.00 0.00 0.00 0.00 2.24 2.23 0.01
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 48 AMEC

Table 19. Hassel Island NPS Receptor – Group 14e – Model Results for St. Thomas WAPA (BART + nonBART) + Other St. 

Thomas Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.92 15.66 16.59 5.89 0.08 0.01 -- 0.08 -- 0.75 -- 5.05 4.49 0.57

2007

98th percentile 1.99 15.81 17.80 12.61 0.10 0.01 -- 0.17 -- 1.71 -- 5.77 4.58 1.19

2007 (73)

Worst 20% Days 1.65 15.67 17.32 10.51 0.16 0.02 -- 0.13 -- 1.33 -- 5.49 4.49 1.00

2008

Annual Average 0.83 15.66 16.49 5.27 0.06 0.01 -- 0.07 -- 0.69 -- 5.00 4.49 0.51

2008

98th percentile 2.13 15.60 17.74 13.68 0.07 0.01 -- 0.19 -- 1.87 -- 5.73 4.45 1.28

2008 (73)

Worst 20% Days 1.65 15.69 17.34 10.54 0.08 0.03 -- 0.14 -- 1.41 -- 5.50 4.50 1.00

2009

Annual Average 0.87 15.66 16.53 5.53 0.04 0.01 -- 0.07 -- 0.74 -- 5.02 4.49 0.53

2009

98th percentile 2.34 15.72 18.06 14.87 0.02 0.00 -- 0.21 -- 2.10 -- 5.91 4.53 1.39

2009 (73)

Worst 20% Days 1.76 15.68 17.44 11.21 0.07 0.01 -- 0.15 -- 1.53 -- 5.56 4.50 1.06

2010

Annual Average 1.76 15.66 17.42 11.22 0.08 0.02 -- 0.15 -- 1.51 -- 5.52 4.49 1.04

2010

98th percentile 4.02 15.81 19.83 25.43 0.18 0.06 -- 0.34 -- 3.44 -- 6.85 4.58 2.27

2010 (73)

Worst 20% Days 3.54 15.66 19.20 22.58 0.13 0.03 -- 0.31 -- 3.07 -- 6.52 4.49 2.03
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 49 AMEC

Table 20. IMPROVE Site – Group 6a – St. Croix, WAPA BART-eligible Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.02 15.66 15.68 0.11 0.01 0.00 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2007

98th percentile 0.18 15.63 15.81 1.16 0.14 0.00 -- 0.00 -- 0.04 -- 4.58 4.46 0.12

2007 (73)

Worst 20% Days 0.09 15.67 15.75 0.55 0.06 0.01 -- 0.00 -- 0.02 -- 4.54 4.49 0.05

2008

Annual Average 0.01 15.66 15.67 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2008

98th percentile 0.07 15.63 15.70 0.45 0.04 0.00 -- 0.00 -- 0.02 -- 4.51 4.46 0.04

2008 (65)

Worst 20% Days 0.03 13.98 14.01 0.17 0.02 0.00 -- 0.00 -- 0.00 -- 4.04 4.02 0.02

2009

Annual Average 0.01 15.66 15.67 0.06 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2009

98th percentile 0.14 15.85 15.99 0.86 0.09 0.00 -- 0.00 -- 0.03 -- 4.69 4.61 0.09

2009 (68)

Worst 20% Days 0.05 14.62 14.67 0.30 0.03 0.00 -- 0.00 -- 0.01 -- 4.23 4.20 0.03

2010

Annual Average 0.02 15.66 15.68 0.10 0.01 0.00 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2010

98th percentile 0.17 15.85 16.02 1.05 0.09 0.06 -- 0.00 -- 0.01 -- 4.71 4.61 0.10

2010 (73)

Worst 20% Days 0.08 15.64 15.72 0.50 0.05 0.01 -- 0.00 -- 0.02 -- 4.52 4.47 0.05
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 50 AMEC

Table 21. Hassel Island NPS Site – Group 6a – St. Croix, WAPA BART-eligible Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.02 15.66 15.68 0.14 0.015 0.001 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2007

98th percentile 0.18 15.63 15.81 1.16 0.14 0.00 -- 0.00 -- 0.04 -- 4.58 4.46 0.12

2007 (50)

Worst 20% Days 0.10 15.68 15.78 0.63 0.07 0.01 -- 0.00 -- 0.02 -- 4.56 4.50 0.06

2008

Annual Average 0.01 15.66 15.67 0.05 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2008

98th percentile 0.10 15.85 15.95 0.64 0.06 0.04 -- 0.00 -- 0.01 -- 4.67 4.61 0.06

2008 (73)

Worst 20% Days 0.04 15.70 15.74 0.26 0.03 0.00 -- 0.00 -- 0.01 -- 4.54 4.51 0.03

2009

Annual Average 0.01 15.66 15.67 0.07 0.01 0.001 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2009

98th percentile 0.14 15.85 15.99 0.86 0.09 0.00 -- 0.00 -- 0.03 -- 4.69 4.61 0.09

2009 (73)

Worst 20% Days 0.06 15.92 15.98 0.37 0.04 0.00 -- 0.00 -- 0.01 -- 4.61 4.57 0.04

2010

Annual Average 0.03 15.66 15.69 0.18 0.02 0.00 -- 0.00 -- 0.01 -- 4.50 4.49 0.02

2010

98th percentile 0.21 15.76 15.96 1.32 0.17 0.00 -- 0.00 -- 0.03 -- 4.68 4.55 0.13

2010 (73)

Worst 20% Days 0.13 15.65 15.78 0.83 0.09 0.01 -- 0.00 -- 0.03 -- 4.56 4.48 0.08
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 51 AMEC

Table 22. IMPROVE Site – Group 6d – St. Croix, WAPA (BART + nonBART) Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.08 15.66 15.74 0.48 0.05 0.01 -- 0.00 -- 0.01 -- 4.53 4.49 0.05

2007

98th percentile 0.77 15.60 16.37 4.95 0.55 0.02 -- 0.02 -- 0.18 -- 4.93 4.44 0.48

2007 (73)

Worst 20% Days 0.37 15.67 16.04 2.36 0.25 0.04 -- 0.01 -- 0.07 -- 4.72 4.49 0.23

2008

Annual Average 0.02 15.66 15.69 0.15 0.02 0.00 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2008 (65)

98th percentile 0.31 15.75 16.06 1.97 0.25 0.01 -- 0.01 -- 0.05 -- 4.74 4.55 0.19

2008 (72)

Worst 20% Days 0.11 15.49 15.60 0.73 0.08 0.01 -- 0.00 -- 0.02 -- 4.52 4.45 0.07

2009

Annual Average 0.04 15.66 15.70 0.24 0.03 0.00 -- 0.00 -- 0.01 -- 4.51 4.49 0.02

2009

98th percentile 0.53 15.85 16.38 3.33 0.21 0.19 -- 0.01 -- 0.11 -- 4.93 4.61 0.33

2009 (73)

Worst 20% Days 0.19 15.70 15.88 1.19 0.13 0.02 -- 0.00 -- 0.03 -- 4.63 4.51 0.12

2010

Annual Average 0.06 15.66 15.72 0.39 0.04 0.01 -- 0.00 -- 0.01 -- 4.53 4.49 0.04

2010

98th percentile 0.61 15.63 16.24 3.90 0.44 0.02 -- 0.01 -- 0.14 -- 4.85 4.46 0.38

2010 (73)

Worst 20% Days 0.30 15.64 15.94 1.92 0.20 0.03 -- 0.01 -- 0.06 -- 4.66 4.47 0.19
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 52 AMEC

Table 23. Hassel Island NPS Site –Group 6d – St. Croix, WAPA (BART + nonBART) Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.09 15.66 15.75 0.58 0.06 0.01 -- 0.00 -- 0.02 -- 4.54 4.49 0.06

2007

98th percentile 0.77 15.81 16.58 4.89 0.59 0.04 -- 0.01 -- 0.13 -- 5.06 4.58 0.48

2007 (50)

Worst 20% Days 0.41 15.68 16.09 2.61 0.28 0.04 -- 0.01 -- 0.08 -- 4.75 4.50 0.26

2008

Annual Average 0.04 15.66 15.70 0.23 0.02 0.00 -- 0.00 -- 0.01 -- 4.51 4.49 0.02

2008

98th percentile 0.43 15.85 16.29 2.74 0.33 0.06 -- 0.00 -- 0.04 -- 4.88 4.61 0.27

2008 (73)

Worst 20% Days 0.18 15.70 15.88 1.13 0.12 0.02 -- 0.00 -- 0.03 -- 4.62 4.51 0.11

2009

Annual Average 0.05 15.66 15.71 0.31 0.03 0.00 -- 0.00 -- 0.01 -- 4.52 4.49 0.03

2009

98th percentile 0.56 15.75 16.32 3.56 0.38 0.01 -- 0.02 -- 0.15 -- 4.90 4.55 0.35

2009 (73)

Worst 20% Days 0.24 15.70 15.94 1.51 0.17 0.02 -- 0.00 -- 0.05 -- 4.66 4.51 0.15

2010

Annual Average 0.11 15.66 15.78 0.72 0.08 0.01 -- 0.00 -- 0.02 -- 4.56 4.49 0.07

2010

98th percentile 0.85 15.85 16.70 5.36 0.46 0.32 -- 0.01 -- 0.06 -- 5.13 4.61 0.52

2010 (73)

Worst 20% Days 0.50 15.65 16.16 3.23 0.34 0.05 -- 0.01 -- 0.10 -- 4.80 4.48 0.32
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 53 AMEC

Table 24. IMPROVE Site – Group 2 - St. John Point Sources

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.24 15.66 15.90 1.54 0.01 0.00 -- 0.02 -- 0.21 -- 4.64 4.49 0.15

2007

98th percentile 1.71 15.47 17.18 11.06 0.01 0.00 -- 0.16 -- 1.55 -- 5.41 4.36 1.05

2007 (73)

Worst 20% Days 0.99 15.65 16.64 6.31 0.02 0.00 -- 0.09 -- 0.88 -- 5.09 4.48 0.61

2008

Annual Average 0.09 15.66 15.75 0.55 0.00 0.00 -- 0.01 -- 0.07 -- 4.54 4.49 0.05

2008

98th percentile 1.01 15.58 16.60 6.51 0.01 0.00 -- 0.09 -- 0.91 -- 5.07 4.44 0.63

2008 (73)

Worst 20% Days 0.42 15.67 16.09 2.69 0.01 0.01 -- 0.04 -- 0.36 -- 4.75 4.49 0.26

2009

Annual Average 0.10 15.66 15.76 0.64 0.00 0.00 -- 0.01 -- 0.09 -- 4.55 4.49 0.06

2009

98th percentile 1.09 15.60 16.69 6.98 0.02 0.00 -- 0.10 -- 0.97 -- 5.12 4.45 0.67

2009 (73)

Worst 20% Days 0.49 15.67 16.17 3.15 0.01 0.00 -- 0.04 -- 0.43 -- 4.80 4.49 0.31

2010

Annual Average 0.01 15.66 15.67 0.06 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2010

98th percentile 0.08 15.76 15.84 0.53 0.03 0.00 -- 0.01 -- 0.05 -- 4.60 4.55 0.05

2010 (34)

Worst 20% Days 0.05 7.33 7.38 0.31 0.00 0.00 -- 0.00 -- 0.04 -- 2.14 2.11 0.03
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 54 AMEC

Table 25. Hassel Island NPS Site - Group 2 - St. John Point Sources

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.22 15.66 15.89 1.42 0.05 0.01 -- 0.02 -- 0.15 -- 4.63 4.49 0.14

2007

98th percentile 1.26 15.55 16.81 8.12 0.16 0.13 -- 0.09 -- 0.88 -- 5.20 4.42 0.78

2007 (73)

Worst 20% Days 0.64 15.68 16.32 4.13 0.13 0.03 -- 0.04 -- 0.44 -- 4.90 4.50 0.40

2008

Annual Average 0.13 15.66 15.80 0.86 0.03 0.01 -- 0.01 -- 0.09 -- 4.57 4.49 0.09

2008

98th percentile 0.63 15.55 16.18 4.06 0.07 0.01 -- 0.05 -- 0.50 -- 4.81 4.42 0.40

2008 (73)

Worst 20% Days 0.38 15.67 16.06 2.44 0.08 0.04 -- 0.02 -- 0.25 -- 4.73 4.49 0.24

2009

Annual Average 0.13 15.66 15.79 0.82 0.02 0.01 -- 0.01 -- 0.09 -- 4.57 4.49 0.08

2009

98th percentile 0.48 15.62 16.10 3.07 0.09 0.01 -- 0.04 -- 0.35 -- 4.76 4.46 0.30

2009 (73)

Worst 20% Days 0.36 15.65 16.01 2.29 0.07 0.02 -- 0.03 -- 0.25 -- 4.71 4.48 0.23

2010

Annual Average 0.73 15.66 16.40 4.70 0.14 0.04 -- 0.05 -- 0.50 -- 4.94 4.49 0.45

2010

98th percentile 1.99 15.62 17.61 12.77 0.34 0.02 -- 0.15 -- 1.48 -- 5.66 4.46 1.20

2010 (73)

Worst 20% Days 1.71 15.68 17.39 10.95 0.34 0.09 -- 0.12 -- 1.17 -- 5.53 4.49 1.04
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 55 AMEC

Table 26. IMPROVE Site – Group 3 - St. John Marine Vessels, No Reductions

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.04 15.66 15.70 0.22 0.01 0.00 -- 0.00 -- 0.02 -- 4.51 4.49 0.02

2007

98th percentile 0.39 15.55 15.95 2.54 0.17 0.02 -- 0.02 -- 0.18 -- 4.67 4.42 0.25

2007 (73)

Worst 20% Days 0.17 15.67 15.84 1.12 0.04 0.01 -- 0.01 -- 0.12 -- 4.60 4.49 0.11

2008

Annual Average 0.02 15.66 15.68 0.12 0.00 0.00 -- 0.00 -- 0.01 -- 4.50 4.49 0.01

2008

98th percentile 0.25 15.60 15.85 1.60 0.12 0.07 -- 0.01 -- 0.05 -- 4.61 4.45 0.16

2008 (26)

Worst 20% Days 0.10 5.59 5.69 0.61 0.02 0.01 -- 0.01 -- 0.07 -- 1.66 1.61 0.06

2009

Annual Average 0.01 15.66 15.68 0.09 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2009

98th percentile 0.07 15.85 15.92 0.46 0.04 0.02 -- 0.00 -- 0.01 -- 4.65 4.61 0.05

2009 (26)

Worst 20% Days 0.07 5.59 5.66 0.44 0.02 0.00 -- 0.00 -- 0.04 -- 1.65 1.60 0.04

2010

Annual Average 0.00 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.00 15.76 15.76 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.55 4.55 0.00

2010 (26)

Worst 20% Days 0.00 5.60 5.61 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 1.62 1.61 0.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 56 AMEC

Table 27. Hassel Island NPS Site - Group 3 - St. John Marine Vessels, No Reductions

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.14 15.66 15.80 0.88 0.08 0.01 -- 0.00 -- 0.04 -- 4.57 4.49 0.09

2007

98th percentile 0.82 15.76 16.58 5.25 0.65 0.02 -- 0.01 -- 0.14 -- 5.06 4.55 0.51

2007 (73)

Worst 20% Days 0.42 15.68 16.10 2.67 0.26 0.03 -- 0.01 -- 0.11 -- 4.76 4.50 0.26

2008

Annual Average 0.09 15.66 15.75 0.56 0.05 0.01 -- 0.00 -- 0.03 -- 4.54 4.49 0.06

2008

98th percentile 0.44 15.76 16.20 2.80 0.29 0.08 -- 0.01 -- 0.06 -- 4.82 4.55 0.28

2008 (73)

Worst 20% Days 0.27 15.67 15.95 1.73 0.17 0.03 -- 0.01 -- 0.07 -- 4.67 4.49 0.17

2009

Annual Average 0.08 15.66 15.74 0.49 0.04 0.01 -- 0.00 -- 0.03 -- 4.53 4.49 0.05

2009

98th percentile 0.31 15.63 15.94 2.00 0.19 0.01 -- 0.01 -- 0.10 -- 4.66 4.46 0.20

2009 (73)

Worst 20% Days 0.23 15.67 15.90 1.45 0.14 0.02 -- 0.01 -- 0.07 -- 4.63 4.49 0.14

2010

Annual Average 0.45 15.66 16.12 2.90 0.26 0.04 -- 0.01 -- 0.14 -- 4.77 4.49 0.28

2010

98th percentile 1.86 15.81 17.68 11.81 1.44 0.09 -- 0.03 -- 0.29 -- 5.70 4.58 1.12

2010 (73)

Worst 20% Days 1.34 15.72 17.06 8.57 0.84 0.11 -- 0.04 -- 0.36 -- 5.34 4.52 0.82
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 57 AMEC

Table 28. IMPROVE Site – Group 3alt - St. John Marine Vessels, with Reductions

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.01 15.66 15.67 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2007

98th percentile 0.06 15.55 15.61 0.39 0.03 0.00 -- 0.00 -- 0.03 -- 4.45 4.42 0.04

2007 (60)

Worst 20% Days 0.03 12.88 12.91 0.17 0.01 0.00 -- 0.00 -- 0.02 -- 3.71 3.69 0.02

2008

Annual Average 0.00 15.66 15.67 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2008

98th percentile 0.04 15.60 15.64 0.27 0.02 0.02 -- 0.00 -- 0.01 -- 4.48 4.45 0.03

2008 (24)

Worst 20% Days 0.01 5.16 5.17 0.10 0.00 0.00 -- 0.00 -- 0.01 -- 1.49 1.48 0.01

2009

Annual Average 0.00 15.66 15.66 0.01 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.01 15.85 15.86 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 4.61 4.61 0.01

2009 (18)

Worst 20% Days 0.01 3.87 3.88 0.07 0.00 0.00 -- 0.00 -- 0.01 -- 1.12 1.11 0.01

2010

Annual Average 0.00 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.00 15.85 15.85 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.61 4.61 0.00

2010 (11)

Worst 20% Days 0.00 2.37 2.37 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 0.68 0.68 0.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 58 AMEC

Table 29. Hassel Island NPS Site – Group 3alt - St. John Marine Vessels, With Reductions

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.02 15.66 15.68 0.14 0.01 0.00 -- 0.00 -- 0.01 -- 4.50 4.49 0.01

2007

98th percentile 0.13 15.76 15.88 0.81 0.10 0.01 -- 0.00 -- 0.02 -- 4.63 4.55 0.08

2007 (73)

Worst 20% Days 0.07 15.68 15.75 0.42 0.04 0.01 -- 0.00 -- 0.02 -- 4.54 4.50 0.04

2008

Annual Average 0.01 15.66 15.68 0.09 0.01 0.00 -- 0.00 -- 0.00 -- 4.50 4.49 0.01

2008

98th percentile 0.07 15.85 15.92 0.46 0.01 0.05 -- 0.00 -- 0.01 -- 4.65 4.61 0.05

2008 (73)

Worst 20% Days 0.04 15.67 15.72 0.29 0.02 0.01 -- 0.00 -- 0.01 -- 4.52 4.49 0.03

2009

Annual Average 0.01 15.66 15.67 0.08 0.01 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.01

2009

98th percentile 0.05 15.72 15.77 0.32 0.03 0.00 -- 0.00 -- 0.01 -- 4.56 4.53 0.03

2009 (73)

Worst 20% Days 0.04 15.67 15.71 0.23 0.02 0.00 -- 0.00 -- 0.01 -- 4.51 4.49 0.02

2010

Annual Average 0.07 15.66 15.74 0.47 0.04 0.01 -- 0.00 -- 0.02 -- 4.53 4.49 0.05

2010

98th percentile 0.34 15.72 16.07 2.17 0.11 0.18 -- 0.00 -- 0.04 -- 4.74 4.53 0.22

2010 (73)

Worst 20% Days 0.23 15.71 15.94 1.44 0.12 0.04 -- 0.01 -- 0.05 -- 4.66 4.52 0.14
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 59 AMEC

Table 30. IMPROVE Site – Group 4 – Puerto Rico Surrogate Power Plant

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2009

Annual Average 0.00 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.00 15.60 15.60 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.45 4.45 0.00

2009 (2)

Worst 20% Days 0.00 0.43 0.44 0.01 0.00 0.00 -- 0.00 -- 0.00 -- 0.13 0.13 0.00

Table 31. Hassel Island NPS Site – Group 4 – Puerto Rico Surrogate Power Plant

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2009

Annual Average 0.00 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.00 15.60 15.60 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.45 4.45 0.00

2009 (2)

Worst 20% Days 0.00 0.43 0.44 0.01 0.00 0.00 -- 0.00 -- 0.00 -- 0.13 0.13 0.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 60 AMEC

Table 32. IMPROVE Site – Group 7 – British Virgin Islands Oil Combustion

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2009

Annual Average 0.08 15.66 15.74 0.49 0.05 0.00 -- 0.00 -- 0.02 -- 4.54 4.49 0.05

2009

98th percentile 0.73 15.55 16.29 4.72 0.42 0.01 -- 0.03 -- 0.28 -- 4.88 4.42 0.46

2009 (73)

Worst 20% Days 0.36 15.64 16.00 2.30 0.24 0.01 -- 0.01 -- 0.10 -- 4.70 4.47 0.36

Table 33. Hassel Island NPS Site – Group 7 – British Virgin Islands Oil Combustion

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2009

Annual Average 0.15 15.66 15.81 0.97 0.12 0.00 -- 0.00 -- 0.03 -- 4.58 4.49 0.10

2009

98th percentile 0.65 15.72 16.38 4.18 0.50 0.01 -- 0.01 -- 0.13 -- 4.94 4.53 0.41

2009 (73)

Worst 20% Days 0.46 15.67 16.13 2.93 0.36 0.01 -- 0.01 -- 0.08 -- 4.78 4.49 0.29
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 61 AMEC

Table 34. IMPROVE Site – Group 8 – British Virgin Islands Burning

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2009

Annual Average 0.03 15.66 15.69 0.18 0.00 0.00 -- 0.00 -- 0.03 -- 4.50 4.49 0.02

2009

98th percentile 0.25 15.72 15.98 1.60 0.00 0.00 -- 0.02 -- 0.23 -- 4.69 4.53 0.16

2009 (73)

Worst 20% Days 0.13 15.64 15.77 0.82 0.00 0.00 -- 0.01 -- 0.12 -- 4.55 4.47 0.08

Table 35. Hassel Island NPS Site – Group 8 – British Virgin Islands Burning

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2009

Annual Average 0.03 15.66 15.69 0.19 0.00 0.00 -- 0.00 -- 0.03 -- 4.51 4.49 0.02

2009

98th percentile 0.12 15.72 15.84 0.76 0.00 0.00 -- 0.01 -- 0.11 -- 4.60 4.53 0.08

2009 (73)

Worst 20% Days 0.09 15.65 15.74 0.56 0.00 0.00 -- 0.01 -- 0.08 -- 4.54 4.48 0.06
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 62 AMEC

Table 36. IMPROVE Site – Group 9 – St. John Fugitive Road Dust

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 2.02 15.66 17.69 12.91 0.00 0.00 -- 0.18 -- 1.84 -- 5.68 4.49 1.20

2007

98th percentile 4.87 15.63 20.50 31.19 0.00 0.00 -- 0.44 -- 4.43 -- 7.18 4.46 2.71

2007 (73)

Worst 20% Days 3.65 15.68 19.32 23.27 0.00 0.00 -- 0.33 -- 3.32 -- 6.58 4.50 2.08

2008

Annual Average 1.68 15.66 17.35 10.74 0.00 0.00 -- 0.15 -- 1.53 -- 5.50 4.49 1.01

2008

98th percentile 3.78 15.63 19.40 24.16 0.00 0.00 -- 0.34 -- 3.43 -- 6.63 4.46 2.16

2008 (73)

Worst 20% Days 3.18 18.25 21.43 20.29 0.00 0.00 -- 0.29 -- 2.89 -- 7.09 5.23 1.86

2009

Annual Average 1.82 15.66 17.48 11.59 0.00 0.00 -- 0.17 -- 1.65 -- 5.57 4.49 1.08

2009

98th percentile 4.34 15.81 20.15 27.44 0.00 0.00 -- 0.39 -- 3.95 -- 7.01 4.58 2.43

2009 (73)

Worst 20% Days 3.36 15.75 19.11 21.35 0.00 0.00 -- 0.31 -- 3.06 -- 6.47 4.54 1.93

2010

Annual Average 1.58 15.66 17.24 10.09 0.00 0.00 -- 0.14 -- 1.44 -- 5.44 4.49 0.95

2010

98th percentile 2.52 15.85 18.37 15.87 0.00 0.00 -- 0.23 -- 2.29 -- 6.08 4.61 1.47

2010 (73)

Worst 20% Days 2.47 15.75 18.22 15.66 0.00 0.00 -- 0.22 -- 2.24 -- 5.97 4.55 1.43
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 63 AMEC

Table 37. Hassel Island NPS Site – Group 9 – St. John Fugitive Road Dust

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.22 15.66 15.88 1.41 0.00 0.00 -- 0.02 -- 0.20 -- 4.63 4.49 0.14

2007

98th percentile 0.64 15.55 16.19 4.09 0.00 0.00 -- 0.06 -- 0.58 -- 4.82 4.42 0.40

2007 (73)

Worst 20% Days 0.49 15.67 16.15 3.10 0.00 0.00 -- 0.04 -- 0.44 -- 4.80 4.49 0.30

2008

Annual Average 0.24 15.66 15.90 1.51 0.00 0.00 -- 0.02 -- 0.22 -- 4.64 4.49 0.15

2008

98th percentile 0.86 15.60 16.45 5.50 0.00 0.00 -- 0.08 -- 0.78 -- 4.98 4.44 0.54

2008 (73)

Worst 20% Days 0.61 15.66 16.27 3.91 0.00 0.00 -- 0.06 -- 0.56 -- 4.87 4.48 0.38

2009

Annual Average 0.21 15.66 15.87 1.32 0.00 0.00 -- 0.02 -- 0.19 -- 4.62 4.49 0.13

2009

98th percentile 0.60 15.85 16.45 3.79 0.00 0.00 -- 0.06 -- 0.55 -- 4.98 4.61 0.37

2009 (73)

Worst 20% Days 0.48 15.68 16.17 3.09 0.00 0.00 -- 0.04 -- 0.44 -- 4.80 4.50 0.30

2010

Annual Average 0.62 15.66 16.28 3.93 0.00 0.00 -- 0.06 -- 0.56 -- 4.87 4.49 0.38

2010

98th percentile 0.99 15.85 16.84 6.21 0.00 0.00 -- 0.09 -- 0.90 -- 5.21 4.61 0.60

2010 (73)

Worst 20% Days 0.88 15.73 16.61 5.58 0.00 0.00 -- 0.08 -- 0.80 -- 5.07 4.53 0.54
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 64 AMEC

Table 38. IMPROVE Site – Group 10 – St. John Burning

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.34 15.66 16.00 2.17 0.00 0.00 -- 0.03 -- 0.31 -- 4.70 4.49 0.21

2007

98th percentile 0.93 15.63 16.56 5.94 0.00 0.00 -- 0.08 -- 0.84 -- 5.04 4.46 0.58

2007 (73)

Worst 20% Days 0.70 15.67 16.38 4.48 0.00 0.00 -- 0.06 -- 0.64 -- 4.93 4.49 0.44

2008

Annual Average 0.23 15.66 15.89 1.47 0.00 0.00 -- 0.02 -- 0.21 -- 4.63 4.49 0.15

2008

98th percentile 0.70 15.60 16.30 4.51 0.00 0.00 -- 0.06 -- 0.64 -- 4.89 4.45 0.44

2008 (73)

Worst 20% Days 0.47 15.71 16.17 2.97 0.00 0.00 -- 0.04 -- 0.42 -- 4.81 4.51 0.29

2009

Annual Average 0.24 15.66 15.90 1.54 0.00 0.00 -- 0.02 -- 0.22 -- 4.64 4.49 0.15

2009

98th percentile 0.81 15.72 16.53 5.13 0.00 0.00 -- 0.07 -- 0.73 -- 5.03 4.53 0.50

2009 (73)

Worst 20% Days 0.52 15.69 16.21 3.31 0.00 0.00 -- 0.05 -- 0.47 -- 4.83 4.50 0.33

2010

Annual Average 0.16 15.66 15.83 1.04 0.00 0.00 -- 0.01 -- 0.15 -- 4.59 4.49 0.10

2010

98th percentile 0.27 15.81 16.08 1.72 0.00 0.00 -- 0.03 -- 0.25 -- 4.75 4.58 0.17

2010 (73)

Worst 20% Days 0.24 15.75 15.99 1.51 0.00 0.00 -- 0.02 -- 0.22 -- 4.69 4.54 0.15
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 65 AMEC

Table 39. Hassel Island NPS Site – Group 10 – St. John Burning

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.01 15.66 15.67 0.07 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2007

98th percentile 0.03 15.55 15.59 0.22 0.00 0.00 -- 0.00 -- 0.03 -- 4.44 4.42 0.02

2007 (73)

Worst 20% Days 0.02 15.88 15.90 0.16 0.00 0.00 -- 0.00 -- 0.02 -- 4.56 4.55 0.02

2008

Annual Average 0.01 15.66 15.67 0.05 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2008

98th percentile 0.03 15.62 15.65 0.20 0.00 0.00 -- 0.00 -- 0.03 -- 4.48 4.46 0.02

2008 (73)

Worst 20% Days 0.02 15.71 15.73 0.14 0.00 0.00 -- 0.00 -- 0.02 -- 4.53 4.52 0.01

2009

Annual Average 0.01 15.66 15.67 0.06 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2009

98th percentile 0.04 15.58 15.62 0.23 0.00 0.00 -- 0.00 -- 0.03 -- 4.46 4.44 0.02

2009 (73)

Worst 20% Days 0.03 15.68 15.71 0.17 0.00 0.00 -- 0.00 -- 0.02 -- 4.51 4.50 0.02

2010

Annual Average 0.03 15.66 15.69 0.19 0.00 0.00 -- 0.00 -- 0.03 -- 4.51 4.49 0.02

2010

98th percentile 0.05 15.81 15.86 0.33 0.00 0.00 -- 0.01 -- 0.05 -- 4.61 4.58 0.03

2010 (73)

Worst 20% Days 0.05 15.72 15.77 0.30 0.00 0.00 -- 0.00 -- 0.04 -- 4.56 4.53 0.03
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 66 AMEC

Table 40. IMPROVE Site – Group 11 – St. John Boilers

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.01 15.66 15.67 0.04 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2007

98th percentile 0.02 15.55 15.57 0.12 0.00 0.00 -- 0.00 -- 0.02 -- 4.43 4.42 0.01

2007 (73)

Worst 20% Days 0.01 15.69 15.70 0.09 0.00 0.00 -- 0.00 -- 0.01 -- 4.51 4.50 0.01

2008

Annual Average 0.004 15.66 15.67 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2008

98th percentile 0.01 15.85 15.87 0.09 0.00 0.00 -- 0.00 -- 0.01 -- 4.62 4.61 0.01

2008 (73)

Worst 20% Days 0.01 15.70 15.71 0.06 0.00 0.00 -- 0.00 -- 0.01 -- 4.52 4.51 0.01

2009

Annual Average 0.004 15.66 15.67 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.02 15.72 15.74 0.10 0.00 0.00 -- 0.00 -- 0.01 -- 4.54 4.53 0.01

2009 (73)

Worst 20% Days 0.01 15.69 15.70 0.06 0.00 0.00 -- 0.00 -- 0.01 -- 4.51 4.50 0.01

2010

Annual Average 0.003 15.66 15.67 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.01 15.72 15.73 0.06 0.00 0.01 -- 0.00 -- 0.00 -- 4.53 4.53 0.01

2010 (73)

Worst 20% Days 0.01 15.94 15.95 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.59 4.59 0.00
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 67 AMEC

Table 41. Hassel Island NPS Site – Group 11 – St. John Boilers

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.001 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2007

98th percentile 0.004 15.63 15.63 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.47 4.46 0.00

2007 (73)

Worst 20% Days 0.002 16.81 16.82 0.01 0.00 0.00 -- 0.00 -- 0.00 -- 4.84 4.84 0.00

2008

Annual Average 0.001 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2008

98th percentile 0.004 15.85 15.86 0.03 0.00 0.00 -- 0.00 -- 0.00 -- 4.61 4.61 0.00

2008 (73)

Worst 20% Days 0.002 16.19 16.19 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.67 4.67 0.00

2009

Annual Average 0.0004 15.66 15.66 0.00 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2009

98th percentile 0.003 15.72 15.73 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.53 4.53 0.00

2009 (73)

Worst 20% Days 0.001 15.94 15.95 0.01 0.00 0.00 -- 0.00 -- 0.00 -- 4.59 4.59 0.00

2010

Annual Average 0.003 15.66 15.67 0.02 0.00 0.00 -- 0.00 -- 0.00 -- 4.49 4.49 0.00

2010

98th percentile 0.03 15.72 15.75 0.18 0.00 0.03 -- 0.00 -- 0.00 -- 4.54 4.53 0.02

2010 (73)

Worst 20% Days 0.01 15.73 15.75 0.07 0.00 0.01 -- 0.00 -- 0.00 -- 4.54 4.53 0.01
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 68 AMEC

Table 42. IMPROVE Site – Group 12 – St. John Misc. Industrial/Construction

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 4.42 15.66 20.08 28.19 0.00 0.00 -- 0.40 -- 4.01 -- 6.87 4.49 2.39

2007

98th percentile 12.07 15.63 27.70 77.24 0.00 0.00 -- 1.10 -- 10.97 -- 10.19 4.46 5.72

2007 (73)

Worst 20% Days 9.12 15.67 24.80 58.20 0.00 0.00 -- 0.83 -- 8.29 -- 9.05 4.49 4.55

2008

Annual Average 2.99 15.66 18.66 19.10 0.00 0.00 -- 0.27 -- 2.72 -- 6.19 4.49 1.70

2008

98th percentile 9.13 15.60 24.73 58.52 0.00 0.00 -- 0.83 -- 8.30 -- 9.06 4.45 4.61

2008 (73)

Worst 20% Days 6.06 15.71 21.76 38.58 0.00 0.00 -- 0.55 -- 5.51 -- 7.73 4.51 3.22

2009

Annual Average 3.14 15.66 18.81 20.06 0.00 0.00 -- 0.29 -- 2.86 -- 6.26 4.49 1.77

2009

98th percentile 10.48 15.72 26.20 66.65 0.00 0.00 -- 0.95 -- 9.53 -- 9.63 4.53 5.11

2009 (73)

Worst 20% Days 6.76 15.69 22.45 43.04 0.00 0.00 -- 0.61 -- 6.14 -- 8.03 4.50 3.53

2010

Annual Average 2.13 15.66 17.79 13.58 0.00 0.00 -- 0.19 -- 1.94 -- 5.75 4.49 1.26

2010

98th percentile 3.52 15.81 19.33 22.29 0.00 0.00 -- 0.32 -- 3.20 -- 6.59 4.58 2.01

2010 (73)

Worst 20% Days 3.10 15.75 18.85 19.65 0.00 0.00 -- 0.28 -- 2.81 -- 6.30 4.54 1.76

Modeled using an area source that is more over land and somewhat larger than used above

2009

Annual Average 2.73 15.66 18.39 17.41 0.00 0.00 -- 0.25 -- 2.48 -- 6.08 4.49 1.59

2009

98th percentile 5.14 15.47 20.60 33.22 0.00 0.00 -- 0.47 -- 4.67 -- 7.23 4.36 2.87

2009 (73)

Worst 20% Days 4.15 15.73 19.88 26.35 0.00 0.00 -- 0.38 -- 3.77 -- 6.86 4.53 2.33
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 69 AMEC

Table 43. Hassel Island NPS Site – Group 12 – St. John Misc. Industrial/Construction

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.14 15.66 15.80 0.88 0.00 0.00 -- 0.01 -- 0.13 -- 4.57 4.49 0.09

2007

98th percentile 0.44 15.55 15.99 2.84 0.00 0.00 -- 0.04 -- 0.40 -- 4.70 4.42 0.28

2007 (73)

Worst 20% Days 0.31 15.66 15.98 1.99 0.00 0.00 -- 0.03 -- 0.28 -- 4.68 4.49 0.20

2008

Annual Average 0.10 15.66 15.77 0.66 0.00 0.00 -- 0.01 -- 0.09 -- 4.55 4.49 0.07

2008

98th percentile 0.41 15.63 16.03 2.60 0.00 0.00 -- 0.04 -- 0.37 -- 4.72 4.46 0.26

2008 (73)

Worst 20% Days 0.29 15.71 15.99 1.82 0.00 0.00 -- 0.03 -- 0.26 -- 4.69 4.51 0.18

2009

Annual Average 0.13 15.66 15.80 0.85 0.00 0.00 -- 0.01 -- 0.12 -- 4.57 4.49 0.08

2009

98th percentile 0.48 15.58 16.06 3.05 0.00 0.00 -- 0.04 -- 0.43 -- 4.74 4.44 0.30

2009 (73)

Worst 20% Days 0.35 15.68 16.03 2.23 0.00 0.00 -- 0.03 -- 0.32 -- 4.72 4.50 0.22

2010

Annual Average 0.39 15.66 16.06 2.52 0.00 0.00 -- 0.04 -- 0.36 -- 4.73 4.49 0.25

2010

98th percentile 0.68 15.72 16.40 4.29 0.00 0.00 -- 0.06 -- 0.61 -- 4.95 4.53 0.42

2010 (73)

Worst 20% Days 0.61 15.72 16.33 3.90 0.00 0.00 -- 0.06 -- 0.56 -- 4.91 4.52 0.38

Modeled using an area source that is more over land and somewhat larger than used above

2009

Annual Average 0.31 15.66 15.97 1.95 0.00 0.00 -- 0.03 -- 0.28 -- 4.68 4.49 0.19

2009

98th percentile 1.00 15.76 16.76 6.37 0.00 0.00 -- 0.09 -- 0.91 -- 5.16 4.55 0.62

2009 (73)

Worst 20% Days 0.77 15.68 16.45 4.92 0.00 0.00 -- 0.07 -- 0.70 -- 4.98 4.50 0.48
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 70 AMEC

Table 44. IMPROVE Site – Group 13 – St. John Onroad

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.07 15.66 15.73 0.46 0.01 0.01 -- 0.01 -- 0.05 -- 4.53 4.49 0.05

2007

98th percentile 0.19 15.60 15.78 1.19 0.03 0.01 -- 0.01 -- 0.13 -- 4.56 4.44 0.12

2007 (73)

Worst 20% Days 0.14 15.69 15.83 0.87 0.02 0.02 -- 0.01 -- 0.09 -- 4.59 4.50 0.09

2008

Annual Average 0.06 15.66 15.72 0.38 0.01 0.01 -- 0.00 -- 0.04 -- 4.52 4.49 0.04

2008

98th percentile 0.17 15.85 16.02 1.06 0.01 0.05 -- 0.01 -- 0.10 -- 4.71 4.61 0.11

2008 (73)

Worst 20% Days 0.11 15.72 15.83 0.72 0.02 0.02 -- 0.01 -- 0.07 -- 4.59 4.52 0.07

2009

Annual Average 0.06 15.66 15.72 0.40 0.01 0.00 -- 0.00 -- 0.05 -- 4.53 4.49 0.04

2009

98th percentile 0.16 15.81 15.97 1.02 0.03 0.01 -- 0.01 -- 0.11 -- 4.68 4.58 0.10

2009 (73)

Worst 20% Days 0.12 15.76 15.88 0.79 0.02 0.01 -- 0.01 -- 0.08 -- 4.63 4.55 0.08

2010

Annual Average 0.06 15.66 15.72 0.36 0.01 0.01 -- 0.00 -- 0.04 -- 4.52 4.49 0.04

2010

98th percentile 0.16 15.81 15.97 0.99 0.03 0.06 -- 0.01 -- 0.06 -- 4.68 4.58 0.10

2010 (73)

Worst 20% Days 0.11 15.77 15.88 0.67 0.01 0.03 -- 0.01 -- 0.06 -- 4.62 4.56 0.07
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 71 AMEC

Table 45. Hassel Island NPS Site – Group 13 – St. John Onroad

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.01 15.66 15.68 0.08 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2007

98th percentile 0.05 15.63 15.68 0.35 0.01 0.04 -- 0.00 -- 0.00 -- 4.50 4.46 0.03

2007 (73)

Worst 20% Days 0.03 15.67 15.71 0.20 0.01 0.01 -- 0.00 -- 0.01 -- 4.51 4.49 0.02

2008

Annual Average 0.01 15.66 15.68 0.09 0.00 0.00 -- 0.00 -- 0.01 -- 4.50 4.49 0.01

2008

98th percentile 0.05 15.60 15.64 0.31 0.02 0.01 -- 0.00 -- 0.02 -- 4.48 4.44 0.03

2008 (73)

Worst 20% Days 0.04 15.68 15.72 0.25 0.01 0.01 -- 0.00 -- 0.01 -- 4.52 4.50 0.02

2009

Annual Average 0.01 15.66 15.67 0.07 0.00 0.00 -- 0.00 -- 0.01 -- 4.49 4.49 0.01

2009

98th percentile 0.04 15.72 15.76 0.24 0.01 0.02 -- 0.00 -- 0.01 -- 4.55 4.53 0.02

2009 (73)

Worst 20% Days 0.03 15.68 15.70 0.17 0.01 0.01 -- 0.00 -- 0.01 -- 4.51 4.50 0.02

2010

Annual Average 0.04 15.66 15.70 0.25 0.01 0.01 -- 0.00 -- 0.02 -- 4.51 4.49 0.02

2010

98th percentile 0.19 15.72 15.92 1.23 0.02 0.15 -- 0.00 -- 0.02 -- 4.65 4.53 0.12

2010 (73)

Worst 20% Days 0.09 15.77 15.86 0.55 0.02 0.05 -- 0.00 -- 0.02 -- 4.61 4.55 0.05
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 72 AMEC

Table 46. IMPROVE Site – Group 17 – St. John Nonroad

IMPROVE BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT 

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.16 15.66 15.83 1.05 0.01 0.00 -- 0.01 -- 0.13 -- 4.59 4.49 0.10

2007

98th percentile 0.41 15.60 16.01 2.62 0.05 0.04 -- 0.03 -- 0.29 -- 4.71 4.45 0.26

2007 (73)

Worst 20% Days 0.30 15.69 15.99 1.92 0.03 0.01 -- 0.02 -- 0.24 -- 4.69 4.50 0.19

2008

Annual Average 0.14 15.66 15.80 0.87 0.01 0.00 -- 0.01 -- 0.11 -- 4.57 4.49 0.09

2008

98th percentile 0.33 15.85 16.18 2.06 0.01 0.04 -- 0.03 -- 0.25 -- 4.81 4.61 0.20

2008 (73)

Worst 20% Days 0.24 15.69 15.93 1.52 0.02 0.01 -- 0.02 -- 0.19 -- 4.66 4.51 0.15

2009

Annual Average 0.15 15.66 15.81 0.93 0.01 0.00 -- 0.01 -- 0.12 -- 4.58 4.49 0.09

2009

98th percentile 0.36 15.81 16.17 2.28 0.03 0.01 -- 0.03 -- 0.29 -- 4.81 4.58 0.23

2009 (73)

Worst 20% Days 0.28 15.76 16.03 1.77 0.02 0.01 -- 0.02 -- 0.22 -- 4.72 4.55 0.18

2010

Annual Average 0.13 15.66 15.79 0.82 0.01 0.00 -- 0.01 -- 0.10 -- 4.57 4.49 0.08

2010

98th percentile 0.29 15.85 16.15 1.86 0.02 0.12 -- 0.01 -- 0.14 -- 4.79 4.61 0.18

2010 (73)

Worst 20% Days 0.21 15.77 15.98 1.34 0.02 0.02 -- 0.02 -- 0.16 -- 4.68 4.55 0.13
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: June 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 73 AMEC

Table 47. Hassel Island NPS Site – Group 17 – St. John Nonroad

Hassel Island BEXT 

(Source)

BEXT 

(BKG)

BEXT 

(Total)

Percent 

CHANGE

BEXT 

SO4

BEXT 

NO3

BEXT 

OC

BEXT 

EC

BEXT

PMC

BEXT 

PMF

BEXT 

NO2

dv 

(total)

dv 

(bkg) ∆dv

Mm-1 Mm-1 Mm-1 % Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1 Mm-1

2007

Annual Average 0.02 15.66 15.69 0.15 0.01 0.00 -- 0.00 -- 0.01 -- 4.50 4.49 0.01

2007

98th percentile 0.08 15.60 15.67 0.50 0.02 0.02 -- 0.00 -- 0.04 -- 4.49 4.44 0.05

2007 (73)

Worst 20% Days 0.05 15.68 15.74 0.34 0.01 0.01 -- 0.00 -- 0.03 -- 4.53 4.50 0.03

2008

Annual Average 0.02 15.66 15.69 0.16 0.00 0.00 -- 0.00 -- 0.02 -- 4.50 4.49 0.02

2008

98th percentile 0.09 15.76 15.84 0.55 0.02 0.05 -- 0.00 -- 0.01 -- 4.60 4.55 0.05

2008 (73)

Worst 20% Days 0.07 15.67 15.74 0.42 0.01 0.01 -- 0.00 -- 0.04 -- 4.54 4.49 0.04

2009

Annual Average 0.02 15.66 15.68 0.13 0.00 0.00 -- 0.00 -- 0.01 -- 4.50 4.49 0.01

2009

98th percentile 0.06 15.76 15.82 0.39 0.02 0.00 -- 0.00 -- 0.04 -- 4.59 4.55 0.04

2009 (73)

Worst 20% Days 0.05 15.68 15.73 0.31 0.01 0.00 -- 0.00 -- 0.03 -- 4.53 4.50 0.03

2010

Annual Average 0.07 15.66 15.73 0.42 0.01 0.01 -- 0.00 -- 0.04 -- 4.53 4.49 0.04

2010

98th percentile 0.19 15.85 16.04 1.18 0.02 0.13 -- 0.00 -- 0.03 -- 4.72 4.61 0.12

2010 (73)

Worst 20% Days 0.11 15.76 15.88 0.73 0.02 0.03 -- 0.01 -- 0.05 -- 4.62 4.55 0.07
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 74 AMEC

5. FERRIES, CRUISE SHIPS, CARGO SHIPS

One of the modeled receptor locations is collocated at the IMPROVE site. Comparing Table 1 

to Table 3, the modeled extinction is generally much less than the observed extinction. The site 

is a little over 500 meters north of the Cruz Bay (Figure 1) and the docks where cruise lines, 

ferries and cargo ships arrive and it is expected that there would be more of an impact from 

those sources on the modeled. 

One possible explanation is the persistence of the trade winds. Annual and 4-year wind roses 

were developed for San Juan L M Martin airport on Puerto Rico (Figures 3 through 7) and 

Charlotte Amalie, St. Thomas for 2007 through 2010 (Figures 8 through 12). From these roses, 

the persistence of the winds from the east is very apparent. The frequency of winds from the 

south and southwest, from Cruz Bay toward the IMPROVE receptor location, is minimal.

Other possibilities to explain this difference were examined. The modeled height of the receptor 

at the IMPROVE site is 46 meters (151 feet). The height was adjusted downward to 0 meters, 

and up to 92 meters, 138 meters, and 184 meters. The resulting change in deciviews (dv) 

ranged from 0.01 (at 0 meters) to 0.08 (at 138 and 184 meters).

The point sources representing the three marine sources were also moved ‘upwind’ (to the 

northeast) of the IMPROVE location and leaving the receptor height at 46 meters. The result 

was dv = 0.01. Again, with the sources ‘upwind’, the exit velocity from each stack was cut in 

half. There was no change in the impacts.

It is unclear at this time why the marine sources do not result in modeled impacts at the 

IMPROVE receptor that more closely match the observed impacts. For purposes of this 

modeling effort, emissions were spread over an entire year. Another possibility to investigate is 

the time the emissions are released. It may be possible to run CALPUFF for those periods 

when, for example, cruise ships are normally maneuvering to dock or hotelling in Cruz Bay. 

However, setting up the model to handle individual days and examine the resulting impact would 

require additional time and resources. Nor is it clear that CALPUFF and analysis of the results 

can easily be run in this mode.
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 75 AMEC

Figure 11. Wind Rose for San Martin Airport, Puerto Rico, 2007-2010

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

San Juan L M Marin, Puerto Rico - 2007-2010

WBAN # 11641, WMO # 78526

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

6%

12%

18%

24%

30%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 21.20%

TOTAL COUNT:

19696 hrs.

CALM WINDS:

21.20%

DATA PERIOD:

2007 2008 2009 2010 

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

3.54 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 76 AMEC

Figure 12. Wind Rose for San Martin Airport, Puerto Rico, 2007

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

San Juan L M Marin, Puerto Rico - 2007

WBAN # 11641, WMO # 78526

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

6%

12%

18%

24%

30%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 23.06%

TOTAL COUNT:

8422 hrs.

CALM WINDS:

23.06%

DATA PERIOD:

2007

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

3.36 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 77 AMEC

Figure 13. Wind Rose for San Martin Airport, Puerto Rico, 2008

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

San Juan L M Marin, Puerto Rico - 2008

WBAN # 11641, WMO # 78526

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

6%

12%

18%

24%

30%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 18.61%

TOTAL COUNT:

8449 hrs.

CALM WINDS:

18.61%

DATA PERIOD:

2008

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

3.82 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 78 AMEC

Figure 14. Wind Rose for San Martin Airport, Puerto Rico, 2009

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

San Juan L M Marin, Puerto Rico - 2009

WBAN # 11641, WMO # 78526

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

6%

12%

18%

24%

30%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 21.99%

TOTAL COUNT:

1396 hrs.

CALM WINDS:

21.99%

DATA PERIOD:

2009

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

3.31 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 79 AMEC

Figure 15. Wind Rose for San Martin Airport, Puerto Rico, 2010

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

San Juan L M Marin, Puerto Rico - 2010

WBAN # 11641, WMO # 78526

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

5%

10%

15%

20%

25%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 24.77%

TOTAL COUNT:

1429 hrs.

CALM WINDS:

24.77%

DATA PERIOD:

2010

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

3.11 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 80 AMEC

Figure 16. Wind Rose for Charlotte Amalie, St. Thomas, 2007-2010

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

Charlotte Amalie, St. Thomas, Virgin Islands - 2007-2010

WBAN # 11640, WMO # (n/a)

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

9%

18%

27%

36%

45%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 5.17%

TOTAL COUNT:

34153 hrs.

CALM WINDS:

5.17%

DATA PERIOD:

2007 2008 2009 2010 

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

4.50 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 81 AMEC

Figure 17. Wind Rose for Charlotte Amalie, St. Thomas, 2007

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

Charlotte Amalie, St. Thomas, Virgin Islands - 2007

WBAN # 11640, WMO # (n/a)

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

8%

16%

24%

32%

40%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 4.51%

TOTAL COUNT:

8479 hrs.

CALM WINDS:

4.51%

DATA PERIOD:

2007 

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

4.56 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 82 AMEC

Figure 18. Wind Rose for Charlotte Amalie, St. Thomas, 2008

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

Charlotte Amalie, St. Thomas, Virgin Islands - 2008

WBAN # 11640, WMO # (n/a)

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

9%

18%

27%

36%

45%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 5.57%

TOTAL COUNT:

8578 hrs.

CALM WINDS:

5.57%

DATA PERIOD:

2008 

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

4.59 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 83 AMEC

Figure 19. Wind Rose for Charlotte Amalie, St. Thomas, 2009

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

Charlotte Amalie, St. Thomas, Virgin Islands - 2009

WBAN # 11640, WMO # (n/a)

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

9%

18%

27%

36%

45%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 4.56%

TOTAL COUNT:

8516 hrs.

CALM WINDS:

4.56%

DATA PERIOD:

2009 

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

4.52 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)
Air Quality Modeling in support of the Regional Haze SIP for the Virgin Islands: May 2012

Final Modeling for Visibility Reduction

Project No.: 6480110234 Page 84 AMEC

Figure 20. Wind Rose for Charlotte Amalie, St. Thomas, 2010

WRPLOT View - Lakes Environmental Software

WIND ROSE PLOT:

Charlotte Amalie, St. Thomas, Virgin Islands - 2010

WBAN # 11640, WMO # (n/a)

COMMENTS: COMPANY NAME:

MODELER:

DATE:

3/6/2012

PROJECT NO.:

NORTH

SOUTH

WEST EAST

7%

14%

21%

28%

35%

WIND SPEED

(m/s)

>= 11.1

8.8 - 11.1

5.7 - 8.8

3.6 - 5.7

2.1 - 3.6

0.5 - 2.1

Calms: 6.04%

TOTAL COUNT:

8580 hrs.

CALM WINDS:

6.04%

DATA PERIOD:

2010 

Jan 1 - Dec 31

00:00 - 23:00

AVG. WIND SPEED:

4.34 m/s

DISPLAY:

 Wind Speed

Direction (blowing from)