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PAGE DESCRIPTION ORIGINAL CHANGE

iv 4.2.3 reference page changed 4-6 4-7

4.2.5 reference page changed 4-7 4-8

4.3 reference page changed 4-8 4-9

v Appendix III.B title changed

"Discussion of" removed.

Discussion of Windblown Dust Emissions from Vacant

Lands

Windblown Dust Emissions from Vacant Lands

3-2 Second paragraph added

after ending of beginning of

page. Specifically after "are

reported in Table3.1.

Footnote was added changing

all the numerical sequence of

the footnotes throughout the

document. See below

We note that the model assumptions used to generate the

emission estimates of Table 3.1 did not evaluate the

impact of off-road vehicular activities on the soil stability

and emission characteristic profiles. Consequently, the

level of additional emissions resulting from anthropogenic

disturbance of vacant lands in Imperial County was

assessed (in a conservative manner as documented in

Appendix III.B) and incorporated in the present SIP

Emission Inventory. The corresponding annual average

level of additional PM10 emissions from open areas is

12.2 tpd (Table III.B.4 of Appendix III.B). 

Last sentence prior to Table

3.1 had text removed.

Further discussion of windblown dust emissions from vacant

lands, including estimation of upper bounds for the

anthropogenic contribution to these emissions, is given in

Appendix III.B. 

Further discussion of windblown dust emissions from

vacant lands is given in Appendix III.B. 

Table 3.1 was formatted no

substance change

A new footnote was added

with the added paragraph.

This changed the numerical

sequence of all the footnotes

within the document. No

footnotes were deleted.

[27] As noted in Appendix III.B, this estimate is conservative

and the actual number is likely to be smaller. Winter and

summer contributions were calculated using the

winter/summer temporal profile derived from the results of

the windblown dust model for contributing sources (i.e.,

Shrubland/Grassland, Dunes, and other barren lands, see

Table III.B.4 of Appendix III.B). Thus, the winter (181 days

from November to April) and summer (184 days from May

to October) emissions were 177.34/157.34 = 112.7% and

137.66/157.34 = 87.5% of the annual average,

respectively.

Footnotes numerically off 27 thru 31 28 thru 32
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PAGE DESCRIPTION ORIGINAL CHANGE

3-4

Windblown Dust Annual

Average

200.47 212.67

Windblown Dust Winter

Average

210.03 223.79

Windblown Dust Summer

Average

191.27 201.95

Open Areas -Othersb Annual

Average

157.34 169.54

Open Areas -Othersb Winter

Average

177.34 191.09

Open Areas -Othersb Summer 

Average

137.66 148.34

Total Annual Average 281 293

Total Winter Average 269 282

Total Summer Average 293 304

Table footnote added the

sentence

Reported emissions also included the conservativelyestimated contributions due to soil disturbance caused by

off-road vehicle usage.

Table 3.3 PM10 Emission Inventory for Imperial County in Baseline Year 2005a (tpd)
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PAGE DESCRIPTION ORIGINAL CHANGE

3-4 Table footnote removed the

language

An analysis of worst case upper estimates of potential

increases in emissions from these lands due to off-highway

vehicle (OHV) use was conducted. The worst case estimate

is based on assuming the most emissive soil conditions

rather than available soil condition information. Based on

that analysis, additional annual average emissions from

lands impacted by OHV use range from negligible (limited

impacts due to either acreage of land disturbed or potentil

degreee of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4). Of that 13.9 tpd worstcase estimate, 13.8 tpd is related OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimate of OHV

use on undesignated areas. Based on observations, the

increase is most likely considerably less than the worst-case

estimate.

3-5

Windblown: 2006 200.46 212.66

Windblown: 2007 200.46 212.66

Windblown: 2008 200.44 212.64

Windblown: 2009 200.44 212.64

Windblown: 210 200.43 212.63

Open Areas -Othersb 2006 157.34 169.54

Open Areas -Othersb 2007 157.34 169.54

Open Areas -Othersb 2008 157.34 169.54

Open Areas -Othersb 2009 157.34 169.54

Open Areas -Othersb 2010 157.34 169.54

Total 2006 282 294

Total 2007 282 294

Total 2008 282 294

Total 2009 282 294

Total 2010 282 294

Table 3.4 Imperial County PM10 Emission Inventorya in 2006-2010 (tpd)
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PAGE DESCRIPTION ORIGINAL CHANGE

3-5

Table footnote added the

sentence

Reported emissions also included the conservativelyestimated contributions due to soil disturbance caused by

off-road vehicle usage.

Table footnote removed the

language

An analysis of worst case upper estimates of potential

increases in emissions from these lands due to off-highway

vehicle (OHV) use was conducted. The worst case estimate

is based on assuming the most emissive soil conditions

rather than available soil condition information. Based on

that analysis, additional annual average emissions from

lands impacted by OHV use range from negligible (limited

impacts due to either acreage of land disturbed or potentil

degreee of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4). Of that 13.9 tpd worstcase estimate, 13.8 tpd is related OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimate of OHV

use on undesignated areas. Based on observations, the

increase is most likely considerably less than the worst-case

estimate.

3-6 thru end 

of 

document

Footnotes numerically off 32 thru 106 33 thru 107

4-5

804 (Open Aeas): Emissions

(tpd)

157.35 169.55

804 (Open Aeas): Reductions

(tpd)

1.11 1.20

Other Open Areasb Emissions 

(tpd)

157.34 169.54

Total Emissions (tpd) 223 235

Total Reductions (tpd) 16.03 16.12

Table 4.1 Imperial County Regulation VIII Emission Reduction Summary (Based on the 2005 Annual Average Inventory)a

Table 3.4 Imperial County PM10 Emission Inventorya in 2006-2010 (tpd) Continued
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PAGE DESCRIPTION ORIGINAL CHANGE

4-5

Table footnote b removed the

language

. (see Table 3.1). As noted earlier (see footnotes of Table

3.3 and 3.4), the annual average emissions from this

category, when calculated using assumptions of higher

surface disturbance related to the impact of Off-Highway

Vehicle usage, may be up to 13.9 tpd higher.

Table 4.1 Imperial County Regulation VIII Emission Reduction Summary (Based on the 2005 Annual Average Inventory)a (Continued)
ERRATUM SHEET

for the

Appendix III.A

PAGE DESCRIPTION ORIGINAL CHANGE

III-4 Section III.6. Third sentence

changed. The word "Also" has

been removed

Also, the results of the revised windblown dust study (see

section III.5) were also used to develop revised annual and

seasonal emission estimates for open areas (i.e.,

grasslands, dunes, barren lands).11

The results of the revised windblown dust study (see

section III.5) were also used to develop revised annual and

seasonal emission estimates for open areas (i.e.,

grasslands, dunes, barren lands).11 

Section III.6. The following

sentence was inserted after

the end of the third paragraph

sentence. 

Finally, additional PM10 emissions due to disturbance of

soils as a result of off-road vehicle usage on Imperial

County vacant lands were calculated as documented in

Appendix III.B

Section III.6 The final

sentence in the paragraph

has the following revisions.

The revised emission factor and updated study resulted in a

~ 140% increase in PM10 emissions from this categories to

187.9 tpd.

The revised emission factor and updated studies resulted

in a > 150% increase in PM10 emissions from these

categories to 200.1 tpd

III-5

Windblown Dust / Annual

Average

200.47 212.67

Windblown Dust / Winter

Average

210.03 223.79

Windblown Dust / Summer

Average

191.27 201.95

Open Areas-Othersb/ Annual

Average

157.34 169.54

Open Areas-Othersb/ Winter

Average

177.34 191.09

Open Areas-Othersb/

Summer Average

137.66 148.34

Total / Annual Average 281 293

Total / Winter Average 269 282

Total / Summer Average 293 304

Table III.1 The following

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table III.1 PM10 Emission Inventory for Imperial County in Baseline Year 2005a (tpd)
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Appendix III.A

PAGE DESCRIPTION ORIGINAL CHANGE

III-5 Table III.1 The following

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 

III-6

Windblown: 2006 200.46 212.66

Windblown: 2007 200.46 212.66

Windblown: 2008 200.44 212.64

Windblown: 2009 200.44 212.64

Windblown: 2010 200.43 212.63

Open Areas-Othersb: 2006 157.34 169.54

Open Areas-Othersb: 2007 157.34 169.54

Open Areas-Othersb: 2008 157.34 169.54

Open Areas-Othersb: 2009 157.34 169.54

Open Areas-Othersb: 2010 157.34 169.54

Total: 2006 282 294

Total: 2007 282 294

Total: 2008 282 294

Total: 2009 282 294

Total: 2010 282 294

Table III.2 Imperial County PM10 Annual-Average Emission Inventorya in 2006-2010 (tpd)
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Appendix III.A

PAGE DESCRIPTION ORIGINAL CHANGE

III-6 Table III.2 The following

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table III.2 The following

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 

III-7

Windblown: 2006 210.02 223.77

Windblown: 2007 210.02 223.77

Windblown: 2008 210.01 223.76

Windblown: 2009 210.01 223.76

Windblown: 2010 209.99 223.74

Open Areas-Othersb: 2006 177.34 191.09

Open Areas-Othersb: 2007 177.34 191.09

Open Areas-Othersb: 2008 177.34 191.09

Open Areas-Othersb: 2009 177.34 191.09

Open Areas-Othersb: 2010 177.34 191.09

Total: 2006 269 283

Total: 2007 270 283

Table III.3 Imperial County PM10 Winter-Average Emission Inventorya in 2006-2010 (tpd)
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Appendix III.A

PAGE DESCRIPTION ORIGINAL CHANGE

III-7 Total: 2008 270 284

Total: 2009 270 284

Total: 2010 270 284

Table III.3 The following

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table III.3 The following

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 

III-8

Windblown: 2006 190.89 201.93

Windblown: 2007 190.89 201.93

Windblown: 2008 190.88 201.92

Windblown: 2009 190.88 201.92

Windblown: 2010 190.87 201.91

Open Areas-Othersb: 2006 137.34 148.34

Open Areas-Othersb: 2007 137.34 148.34

Open Areas-Othersb: 2008 137.34 148.34

Open Areas-Othersb: 2009 137.34 148.34

Table III.4 Imperial County PM10 Summer-Average Emission Inventorya in 2006-2010 (tpd)
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Appendix III.A

PAGE DESCRIPTION ORIGINAL CHANGE

III-8 Open Areas-Othersb

: 2010 137.34 148.34

Total: 2006 294 305

Total: 2007 294 305

Total: 2008 294 305

Total: 2009 294 306

Total: 2010 294 305

Table III.4 The following

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table III.4 The following

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 
ERRATUM SHEET

for the

Appendix III.B

PAGE DESCRIPTION ORIGINAL CHANGE

COVER Removed the words

"DISCUSSION OF" from

header throughout document

Appendix III.B: Discussion of Windblown Appendix III.B: Windblown

Removed the words

"DISCUSSION OF" from title

DISCUSSION OF WINDBLOWN DUST EMISSIONS FROM

VACANT LANDS

WINDBLOWN DUST EMISSIONS FROM VACANT

LANDS

III.B-i Removed and added wording This appendix provides additional information about

windblown dust estimates from vacant lands, as calculated

by the windblown dust model (ENVIRON, 2004 and later

revisions). In addition, it considers the possible impact of offroad activity on the emission inventory for these areas

(beyond assumptions already used in the modeling) by

identifying those state and federal lands where off-road

activities are allowed and calculating a "worst case" bound

of potential additional anthropogenic emissions.

This appendix provides additional information about

windblown dust estimates from vacant lands, as calculated

by the windblown dust model (ENVIRON, 2004 and later

revisions). In addition, it considers the impact of off-road

activity on the emission inventory for these areas by

identifying those state and federal lands where off-road

activities are allowed and estimating the additional levels

of emissions (relative to the estimates of Table 3.1 of the

SIP document) that arise from these lands due to

anthropogenic soil disturbance unaccounted for in prior

modeling assumptions (see Section III.B.2 of this appendix

for details.)

III.B-3 Replaced words last sentence

under "Model Assumptions in

Calculation of Imperial County

Windblown PM10 Emissions

Best Estimates

Best estimates of windblown dust emissions in Imperial

County calculated using the windblown dust model3(Tables 

3.1 and 3.2 of the SIP document) were obtained asssuming:

Best estimates of windblown dust emissions in Imperial

County calculated using the windblown dust model3(Table

3.1 of the SIP document) was obtained asssuming:

III.B-4 Replaced words section

III.B.3 Title

Possible Impact of Anthropogenic Disturbance of Vacant

Lands Beyond Model Assumptions

Estimated Impact of Anthropogenic Disturbance of Vacant

Lands Beyond Model Assumptions

First Bullet point added

comma

The anthropogenic contribution should be estimated as the

incremental level of emissions relative to the native

baseline, i.e., 

Second Bullet point changed

do to does

In some cases, this difference is zero. For instance, the

sand dunes are fully unstable and have 0% vegetative

canopy cover in the native state. Therefore, vehicle offroading on these lands do not alter any of the parameters

that impact emissions, such as soil type, LULC, stability, or

reservoi characteristics.

In some cases, this difference is zero. For instance, the

sand dunes are fully unstable and have 0% vegetative

canopy cover in the native state. Therefore, vehicle offroading on these lands does not alter any of the

parameters that impact emissions, such as soil type,

LULC, stability, or reservoi characteristics.
ERRATUM SHEET

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Appendix III.B

PAGE DESCRIPTION ORIGINAL CHANGE

III.B-4 Second paragraph second

sentence completely removed 

Therefore, in light of the uncertainty described above in the

model estimates, there is insufficient information to suggest

which refined assumptions (about soil characteristics for

each disturbed and undisturbed vacant land in Imperial

County) should be chosen to obtain more accurate emission

estimates.

Last paragraph was merged

with the second paragraph

and had language removed.

Nevertheless, in response to particular interest in the level of

emissions from vacant lands that is due to off-road

anthropogenic activity we conducted additional analyses to

estimate conservative upper bounds of the incremental

levels of windblown dust emissions...

Nevertheless, in response to particular interest in the level

of emissions from vacant lands that is due to off-road

anthropogenic activity, and to establish a complete

emissions inventory, we conducted additional analyses to

estimate conservative estimates of the incremental levels

of windblown dust emissions...

III.B-5

Deleted words "Upper Bound"

from Title

Conservative Upper Bound Estimates of Additionala PM10 

Emissions Due to Off-Road Anthropogenic Disturbancebof

Federal and State Vacant Lands in Imperial County.

Conservative Estimates of Additionala PM10 Emissions

Due to Off-Road Anthropogenic Disturbancebof Federal

and State Vacant Lands in Imperial County.

Wording changed on title

heading of the third column

Upper Bound Estimate of Additionala PM10 Emissions (tpd) Conservative Estimate of Additionala PM10 Emissions (tpd)

BLM Open Areas Column

three

7.5 5.8

BLM Open Areas Plaster City

Column three

1.8 0.6

BLM Open Areas Superstition

Mountains Column three

0.8 0.3

Total column three 13.8 tpd ~12.1 tpd

Footnote a for table changed

wording

aRelative to windblown dust model results established in

Section 3.1.1 of the SIP document and Section III.B.2 of this

report.

aRelative to windblown dust model results established in

Section 3.1.1 of the SIP document and Section III.B.2 of

this appendix.

Under the reasoning section

third bullet point the

percentage and wording was

changed

Anthropogenic disturbance of these lands can be expected

to generate some level of instability. Based on information

provided by BLM,4 we assume here that up to 50% of these

lands are disturbed by OHV usage. Using this assumption,

extreme estimates of emissions may be obtained using the

rate of emissions per acre...

Anthropogenic disturbance of these lands can be expected

to generate some level of instability. Based on information

provided by BLM,4 we assume here that up to 16% of 

these lands are disturbed by OHV usage. Using this

assumption, conservative estimates of emissions may be

obtained using the rate of emissions per acre...

Table III.B.3
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Appendix III.B

PAGE DESCRIPTION ORIGINAL CHANGE

III.B-5 Footnote 4 removed language

and added language

4Communication from Erin Dreyfuss to the ICAPCD July

2009

4Communication to the ICAPCD from the El Centro Field

Office of the Bureau of Land Management, United States

Department of the Interior, July 22, 2009

III.B-6 First paragraphs percentage

changed and wording

changed

results5obtained in this manner are reported in Table III.B.3.

This analysis is very conservative because (i) the

assumption of 50% disturbance is conservative....

results5obtained in this manner are reported in Table

III.B.3. This analysis is conservative because (i) the

assumption of 16% disturbance is conservative....

Under the Sand Dunes

section second bullet middle

of the paragraph wording was

added

(Table III.B.1). If we apply the rate of PM10 emissions.... (Table III.B.1). Information provided by the BLM (refer to

footnote 4 above) indicates that approximately 50% of

these lands are disturbed by OHV usage. If we apply the

rate of PM10 emissions....

Footnote 5 had percentage

changes and total tpd

changes towards end of

footnote 5

...areas are 50% x 1.3 x 10-4 tpd/acre x 27 x 103acres = 1.8 

tpd for the Plaster City Open Area and 50% x 1.3 x 10-4 

t

pd/acre x 13 x 103acres = 0.8 tpd for the Superstition

Mountains Open Area.

...areas are 16% x 1.3 x 10-4 tpd/acre x 27 x 103acres =

0.6 tpd for the Plaster City Open Area and 50% x 1.3 x 10-

4 t

pd/acre x 13 x 103acres = 0.3 tpd for the Superstition

Mountains Open Area.

Last sentence calculation

factor changed

...the Arroyo Salado area are 50%x0.4 tpdx200 = 4 tpd... ...the Arroyo Salado area are 50%x0.4 tpdx20 = 4 tpd...

III.B-7 Under III.B.4 Summary words

were removed and added as

were amounts related to tpd.

According to the foregoing analyses, a conservative upper 

bound of additional7 windblown PM10 emissions due to

anthropogenic activities8on Imperial County vacant lands is

< 14 tpd. (The actual number is likely to be considerably 

smaller, based on the nature of the conservative

assumptions used in the above analysis.)...

According to the foregoing analyses, a conservative

estimate of additional7 windblown PM10 emissions due to

anthropogenic activities8on Imperial County vacant lands

is < 12.2 tpd. (The actual number is likely to be smaller,

based on the nature of the conservative assumptions used

in the above analysis.)...

III.B-8

Deleted words "Upper Bound"

from Title

Summary Table of Modeled PM10 Emissions (Reported

According to LULC) and Conservative Upper Bound

Estimates of Additionala PM10 Emissions Resulting from

Assumptions of More Severe Impacts to OHV Usage on

Soils Disturbed by OHV Usage.

Summary Table of Modeled PM10 Emissions (Reported

According to LULC) and Conservative Upper Bound

Estimates of Additionala PM10 Emissions Resulting from

Assumptions of More Severe Impacts to OHV Usage on

Soils Disturbed by OHV Usage.

Wording changed on title

heading of the third column

Upper Bound of additonalc PM10 Emissions assuming more

severe impacts of OHV usage (tpd)

Conservative Estimate of additonalc PM10 Emissions due to 

OHV usage (tpd)

Desert-Other Designated for

OHV usage third column rate

changed

12.3d11.0d

Table III.B.4
ERRATUM SHEET

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Appendix III.B

PAGE DESCRIPTION ORIGINAL CHANGE

III.B-8 Shrubland/Grassland 

Designated for OHV usage

third column rate changed

1.5f1.1f

Total column three 13.9 tpd 12.2 tpd
ERRATUM SHEET

for the

Appendix IV C

PAGE DESCRIPTION ORIGINAL CHANGE

IV.C-2

Windblown: 2006 196.40 208.52

Windblown: 2007 196.34 208.45

Windblown: 2008 196.26 208.37

Windblown: 2009 196.19 208.3

Windblown: 2010 196.11 208.22

Open Areas-Othersb: 2006 156.24 168.35

Open Areas-Othersb: 2007 156.24 168.35

Open Areas-Othersb: 2008 156.24 168.35

Open Areas-Othersb: 2009 156.24 168.35

Open Areas-Othersb: 2010 156.24 168.35

Total: 2006 274 286

Total: 2007 273 285

Total: 2008 272 284

Total: 2009 272 284

Total: 2010 271 283

Table IV.C-2 The following

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table IV.C-2 Imperial County PM10 "Grown and Controlled" Annual Average Emision Inventorya in 2006-2010 (tpd)
ERRATUM SHEET

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Appendix IV C

PAGE DESCRIPTION ORIGINAL CHANGE

Table IV.C-2 Imperial County PM10 "Grown and Controlled" Annual Average Emision Inventorya

IV.C-2 Table IV.C-2 The following in 2006-2010 (tpd)

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 

IV.C-3

Windblown: 2006 205.86 219.51

Windblown: 2007 205.82 218.47

Windblown: 2008 205.77 218.42

Windblown: 2009 205.77 219.38

Windblown: 2010 205.67 219.33

Open Areas-Othersb: 2006 176.10 189.75

Open Areas-Othersb: 2007 176.10 189.75

Open Areas-Othersb: 2008 176.10 189.75

Open Areas-Othersb: 2009 176.10 189.75

Open Areas-Othersb: 2010 176.10 189.75

Total: 2006 262 275

Total: 2007 261 275

Total: 2008 261 274

Total: 2009 260 274

Total: 2010 260 273

Table IV.C-3 Imperial County PM10 "Grown and Controlled" Winter Average Emission Inventorya in 2006-2010 (tpd)
ERRATUM SHEET

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Appendix IV C

PAGE DESCRIPTION ORIGINAL CHANGE

Table IV.C-2 Imperial County PM10 "Grown and Controlled" Annual Average Emision Inventorya

IV.C-3 Table IV.C-3 The following in 2006-2010 (tpd)

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table IV.C-3 The following

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 

IV.C-4

Windblown: 2006 186.95 197.79

Windblown: 2007 186.95 197.7

Windblown: 2008 186.75 197.59

Windblown: 2009 186.65 197.49

Windblown: 2010 186.55 197.39

Open Areas-Othersb: 2006 136.38 147.3

Open Areas-Othersb: 2007 136.38 147.3

Open Areas-Othersb: 2008 136.38 147.3

Open Areas-Othersb: 2009 136.38 147.3

Open Areas-Othersb: 2010 136.38 147.3

Total: 2006 286 297

Total: 2007 285 296

Table IV.C-4 Imperial County PM10 "Grown and Controlled" Summer Average Emission Inventorya in 2006-2010 (tpd)
ERRATUM SHEET

for the

Appendix IV C

PAGE DESCRIPTION ORIGINAL CHANGE

Table IV.C-2 Imperial County PM10 "Grown and Controlled" Annual Average Emision Inventorya

IV.C-4 Total: 2008 284 295 in 2006-2010 (tpd)

Total: 2009 283 294

Total: 2010 281 292

Table IV.C-4 The following

sentence was inserted after

the end of the second

sentence in footnote "B".

Reported emissions also include the conservativelyestimated contributions due to soil disturbances caused by

off-road vehicle usage

Table IV.C-4 The following

sentences were removed

from footnote "B".

An analysis of worst case upper estimates of potential

increases in emissions from those lands due to off-highway

vehicle (OHV) use was conducted. The worst-case

estimate is based on assuming the most emissive soil

conditions rather than available soil condition information.

Based on that analysis, additional annual average emissions

from lands impacted by OHV use range from negligible

(limited impacts due to either acreage of land disturbed or

potential degree of increased emissivity) up to a worst-case

estimate of 13.9 tpd (Table III.B.4) Of that 13.9 tpd worstcase estimate, 13.8 tpd is related to OHV use on designated

OHV use areas that are subject to BLM and state land

requirements and 0.1 tpd is the worst-case estimated of

OHV use on undesignated areas. Based on observations,

the increase is most likely considerably less than the worstcase estimate. 
ERRATUM SHEET

for the

Appendix V

PAGE DESCRIPTION ORIGINAL CHANGE

V-18

Windblown Dust Annual

Average (tpd) changed

200.47 212.67

Windblown Dust Open Areas -

Grasslands, Dunes, Barren

Lands Annual Average (tpd)

changed

157.34 169.54

Total Annual Average (tpd)

changed

124 136

NOTE 

V-19

V-20

V-23

V-24

V-26

Windblown Dust Winter

Average (tpd) changed

210.03 223.79

Windblown Dust Open Areas -

Othersb Winter Average (tpd)

changed

177.34 191.09

Version released for review had underlined words that were missed. There is no significance to the underlined words and should not be underlined.

Table 14 Imperial County Winter PM10 Emission Inventory (2005)a

Table 13 PM10 Emission Inventory for Imperial County in 2005

Version released for review had underlined words that were missed. There is no significance to the underlined words and should not be underlined.

Version released for review had underlined words that were missed. There is no significance to the underlined words and should not be underlined.

Version released for review had underlined words that were missed. There is no significance to the underlined words and should not be underlined.

Version released for review had underlined words that were missed. There is no significance to the underlined words and should not be underlined.