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Discovery Report !"#$%%$ ’"%$()*$+, -./ 01232044 Cities of Horseshoe Bend, Emmett, and Payette, and Boise, Gem, and Payette Counties, Idaho Report Number 02 01/21/2012

Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

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Page 1: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

Discovery Report !"#$%%$&'"%$()*$+,&-./&01232044&

&Cities of Horseshoe Bend, Emmett, and Payette, and

Boise, Gem, and Payette Counties, Idaho

Report Number 02

01/21/2012

Page 2: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

!"#$%&'(&)'*+%*+,&

I.! General Information ............................................................................................1!

II.! Watershed Stakeholder Coordination..................................................................3!

III.! Data Analysis.......................................................................................................3!

i.! Data that can be used for Flood Risk Products....................................................5!

ii.! Other Data and Information.................................................................................5

IV.! Discovery Meeting ............................................................................................12!

V.! Appendix and Tables Included in CD ...............................................................13!

Page 3: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

1

I. General Information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

Page 4: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

2

!"#$%&$'"()**)$+"*),-.)/$',01)2*$3,)"$!"#$

Page 5: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

3

II. Watershed Stakeholder Coordination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

III. Data Analysis H&I7)%&8D&%*$&+"%"&>8II$>%$+,&%*$&+$I7<$("BI$&8(&?(8+L>%&79&C*7>*&%*$&+"%"&"($&79>IL+$+,&"9+&%*$&)8L(>$&8D&%*$&+"%"&7)&)*8C9&79&O"BI$&0M&&G9&"++7%789,&="%"&H9"I#)7)&7)&+7<7+$+&B$%C$$9&%C8&)$>%789)_&89$&)$>%789&I7)%796&%*$&+"%"&%*"%&>"9&B$&L)$+&D8(&57)J&[H!&?(8+L>%)&X($6LI"%8(#&"9+&989S($6LI"%8(#Y&"9+,&89$&)$>%789&I7)%796&%*$&8%*$(&+"%"&"9+&79D8(K"%789&%*"%&*$I?$+&%*$&?(8@$>%&%$"K&%8&D8(K&"&K8($&*8I7)%7>&L9+$()%"9+796&8D&%*7)&C"%$()*$+M&&

4"56)$%&$7"*"$8066)2*90:$;0,$'"()**)$+"*),-.)/$

!"#"$%&'()$ !(*+,(-".*(/0-1234#$ 513-4($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

617738+#&$9))+)#"84($:+)+#)$ /8KKL97%#&P">%&Q*$$%& &/8KKL97%#&G9D8(K"%789&Q#)%$K&X/GQY&

617738+#&$;"#+8<$5&)#(7$$ /8KKL97%#&P">%&Q*$$%& PN[H`)&a/8KKL97%#&5"%796&Q#)%$K&/8KKL97%7$)&"9+&O*$7(&/I"))$)a&

!(71<-"'=+4)>$?823)#-&$ /8KKL97%#&P">%&Q*$$%& .MQM&/$9)L)&WL($"L,&bL7>JP">%)&O"BI$&=!&

?8)3-"84($01*+4+()$ /8KKL97%#&P">%&Q*$$%& &/8KKL97%#&G9D8(K"%789&Q#)%$K&X/GQY&

@+#+<"#+18$0*"8)$5#"#3)$ /8KKL97%#&P">%&Q*$$%& PN[H&5$6789"I&ADD7>$&

@+#+<"#+18$0-1A(4#)$ /8KKL97%#&P">%&Q*$$%& ="%"M68<_&PN[H&-"^"(+&[7%76"%789&!(86("K&QLKK"(#&

;('(#+#+,($B1))$ /8KKL97%#&P">%&Q*$$%& &/8KKL97%#&G9D8(K"%789&Q#)%$K&X/GQY&

C18($D>$6>$"82$E$6*"+7)$ /8KKL97%#&P">%&Q*$$%& &/8KKL97%#&G9D8(K"%789&Q#)%$K&X/GQY&

Page 6: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

4

B(##(-$1F$@"'$6="8<($GBH@6)I$ /8KKL97%#&P">%&Q*$$%&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&XJ98C9&>IL)%$()&89&&

=7)>8<$(#&["?&U$8+"%"B")$Y&

&/8KKL97%#&G9D8(K"%789&Q#)%$K&X/GQY,&/8KKL97%#&G9%$(<7$C&

!(4*"-(2$!+)")#(-)$ /8KKL97%#&P">%&Q*$$%)& ="%"M68<_&PN[H&=7)")%$(&=$>I"("%789)&QLKK"(#&

J"K"-2)$ /8KKL97%#&P">%&Q*$$%)& &/8KKL97%#&G9D8(K"%789&Q#)%$K&X/GQY&

D1382"-+()L$617738+#&>$?2"=1$ =7)>8<$(#&["?&U$8+"%"B")$& NQ5G&&

D1382"-+()L$6138#&$"82$5#"#($$ =7)>8<$(#&["?&U$8+"%"B")$& T"%789"I&H%I")&8D&%*$&.97%$+&Q%"%$)&

D1382"-+()L$M"#(-)=(2)$ =7)>8<$(#&["?&U$8+"%"B")$& .MQM&U$8I867>&QL(<$#&

NFF(4#+,($O*112'*"+8)L$$@12(-8+K(2$5OJ9)$

=7)>8<$(#&["?&U$8+"%"B")$& PN[H`)&5$6789"I&PI88+&-"^"(+&c"#$(&&

O3#3-($1-$-(4(8#$=+<=P"&$+7'-1,(7(8#>$.-+2<(>$43*,(-#>$

*(,(($*14"#+18)$

=7)>8<$(#&["?&U$8+"%"B")$& =$<$I8?$+&B")$+&89&>8KKL97%#&79%$(<7$C&

J&2-1<-"'=&L$?2"=1>$H-(<18>$M")=+8<#18$

=7)>8<$(#&["?&U$8+"%"B")$& .MQM&U$8I867>&QL(<$#`)&T"%789"I&-#+(86("?*#&c"#$(&&

@+#+<"#+18$0-1A(4#)L$;(4(8#>$18<1+8<>$'*"88(2>$2()+-(2$ON@9/HO9/*14"*$'-1A(4#)$

=7)>8<$(#&["?&U$8+"%"B")$& =$<$I8?$+&B")$+&89&>8KKL97%#&79%$(<7$C&

;(4(8#$*"82$4="8<()$G2(,(*1'7(8#>$P+*2F+-()>$

*"82)*+2()>$(#4QI$

=7)>8<$(#&["?&U$8+"%"B")$& =$<$I8?$+&B")$+&89&>8KKL97%#&79%$(<7$C&

;(4(8#*&$2(,(*1'(2$1-$'*"88(2$=+<=$<-1P#=$"-(")$

=7)>8<$(#&["?&U$8+"%"B")$& =$<$I8?$+&B")$+&89&>8KKL97%#&79%$(<7$C&

5#-("7$R"<()$ =7)>8<$(#&["?&U$8+"%"B")$& .MQM&U$8I867>&QL(<$#&

5#32&$S((2)L$ON@9$ =7)>8<$(#&["?&U$8+"%"B")$& /88(+79"%$+&T$$+)&["9"6$K$9%&Q#)%$K&X/T[QY&

5#32&$S((2)L$;(4(8#>$18<1+8<>$'*"88(2>$2()+-(2$

ON@9/HO9/*14"*$)#32+()$

=7)>8<$(#&["?&U$8+"%"B")$& =$<$I8?$+&B")$+&89&>8KKL97%#&79%$(<7$C&

%1'1<-"'=+4$9,"+*".+*+#&$ =7)>8<$(#&["?&U$8+"%"B")$& 5:&G9<$9%8(#&

%-"8)'1-#"#+18L$;"+*-1"2)>$?2"=1$

=7)>8<$(#&["?&U$8+"%"B")$& G+"*8&=$?"(%K$9%&8D&O("9)?8(%"%789&&

%-"8)'1-#"#+18L$;1"2)>$?2"=1$ =7)>8<$(#&["?&U$8+"%"B")$& G+"*8&Q%"%$&U$8)?"%7"I&="%"&/I$"(796*8L)$&

618#"4#)$ N;>$I&)?($"+)*$$%& c8>"I&C$B)7%$),&Q%"%$FPN[H&L?+"%$)&

$

&&

Page 7: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

5

i. Data that can be used for Flood Risk Products

Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of the

Payette River from the confluence with Snake River to just north of Horseshoe Bend. The

LiDAR was expected to be flown in late 2010 and would likely be available for a fall 2011

project.

ii. Other Data and Information

Mitigation Plans/Status, Mitigation Projects [7%76"%789&?I"9)&79&G+"*8&"($&?($?"($+&B#&%*$&>8L9%7$)&")&HIIS-"^"(+&!I"9)&D8(&"II&%*$&79>8(?8("%$+&"9+&L979>8(?8("%$+&>8KKL97%7$)&C7%*79&%*$&>8L9%#M&&G9&!"#$%%$&'"%$()*$+,&%*$&>8KKL97%7$)&79+7>"%$+&%*"%&%*$#&+7+&98%&>89%(7BL%$&%8&%*$&>8L9%#&?I"9)M&&W87)$&/8L9%#&X"9+&-8()$)*8$&W$9+Y&K7%76"%789&?I"9&L?+"%$)&"($&+L$&79&T8<$KB$(&4200d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

CNMS and NFIP Mapping Study Needs O*$&/T[Q&+"%"&)L66$)%$+&%*"%&"&>89)7+$("BI$&9LKB$(&8D&DI88+796&)8L(>$)&79&%*$&C"%$()*$+&)*8LI+&B$&L?+"%$+M&&T8&>I"7K)&C$($&7+$9%7D7$+&79&%*$&W,&/,&8(&:&^89$),&"9+&%*$&>8KKL97%7$)&+7+&98%&7+$9%7D#&"9#&>IL)%$()&8D&cA[HFcA[5SP)&XB8%*&8D&C*7>*&K"#&79+7>"%$&"&9$$+&D8(&)%L+#YM&&O*$&>8KKL97%7$)&"6($$+&%*"%&%*$#&C8LI+&?($D$(&%8&*"<$&9$C&)%L+7$)&D8(&"II&8D&%*$&DI88+796&)8L(>$)&79&%*$&C"%$()*$+M&&W"((796&%*"%,&%*$#&($ZL$)%$+&9$C&+$%"7I$+&)%L+7$)&D8(&"II&8D&%*$&($">*$)&>L(($9%I#&)%L+7$+&B#&+$%"7I$+&K$%*8+)M&&Q8K$&"($"),&*8C$<$(,&)%"9+&8L%&")&*"<796&%*$&*76*$)%&9$$+&D8(&L?+"%$+&)%L+7$)M&&O*$)$&)%L+#&"($")&"($&($DI$>%$+&89&%*$&P79"I&=7)>8<$(#&["?&"9+&79&%*$&%"BI$&B$I8CM&&&

STAKEHOLDER PRIORITY

FLOODING SOURCE

STUDY LENGTH (miles)

STUDY LIMITS STUDY TYPE

1 Payette River

(City of Payette)

3.4 Hwy 95 west to the confluence

with Snake River Detailed

1 Payette River

(City of Emmett)

4.8 Frozen Dog Road to the eastern end of the wastewater treatment

plant levee Detailed

Page 8: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

6

STAKEHOLDER PRIORITY

FLOODING SOURCE

STUDY LENGTH (miles)

STUDY LIMITS STUDY TYPE

1

Payette River

(City of Horseshoe

Bend)

3.2 Just north of Jackass Creek south

around Horseshoe Bend and to the western city limits

Detailed

2 Sevenmile

Slough 1

Near the Town of Letha (see Final Discovery Map)

New Approximate

3 Sand Hollow 1.3 Southeast of Emmett (see Final

Discovery Map) New

Approximate

FY09 funded Bissel Creek 9.6

From confluence with Payette River to approximately 1.1 miles

downstream of Sucker Creek Road.

New Approximate

FY09 funded Haw Creek 9.5 From confluence with Payette

River to approximately 0.5 mile upstream of Butte Road.

New Approximate

FY09 funded Sevenmile

Slough 11.9

From confluence with Payette River (Approximately 1.8 miles

upstream of Gem County / Payette County border) to divergence from

Payette River (Approximately 0.1 mile north of Cascade Road and 1

mile east of State Highway 52).

New Approximate

FY09 funded Squaw Creek 4.5 Same as effective maps. Incorporated

via LOMR

&

Socio-Economic Analysis: O*$&>8KKL97%7$)&79&%*$&!"#$%%$&'"%$()*$+&"($&)K"II,&C7%*&%*$&I"(6$)%&>7%#&B$796&%*$&/7%#&8D&!"#$%%$&"%&@L)%&8<$(&1,222&($)7+$9%)&X4222&/$9)L)&+"%"YM&&O*$&K$+7"9&"6$&79&%*$&C"%$()*$+&7)&79&%*$&I"%$&e2f),&C7%*&"(8L9+&"&0eg&?8?LI"%789&8<$(&R3&#$"()&8I+,&"9&"<$("6$&8D&"(8L9+&3g&989SN96I7)*&)?$"J$(),&"9+&I$))&%*"9&0g&T"%7<$&HK$(7>"9)M&&H??(8;7K"%$I#&13g&8D&%*$&?8?LI"%789&*8I+)&"&*76*&)>*88I&+7?I8K",&"9+&"(8L9+&02g&*"<$&"&>8II$6$&+$6($$M&&H)&8D&4222,&@L)%&L9+$(&R2g&8D&($)7+$9%)&8<$(&"6$&0R&%*"%&+$)7($+&$K?I8#K$9%&C$($&C8(J796,&C7%*&"&K$+7"9&79>8K$&@L)%&8<$(&he2,222&"99L"II#M&&5$)7+$9%)&">(8))&%*$&C"%$()*$+&C8(J$+&?(7K"(7I#&79&K"9LD">%L(796d&$+L>"%789"I,&*$"I%*,&"9+&)8>7"I&)$(<7>$)d&"9+&($%"7I&%("+$M&&O*$($&C")&98%*796&8L%)%"9+796&79&%*$&+$K86("?*7>)&+"%"&%8&79+7>"%$&%*"%&)?$>7"I&8L%($">*&)%("%$67$)&C8LI+&B$&9$>$))"(#&D8(&%*$&>8KKL97%7$)&79&!"#$%%$&'"%$()*$+M&&O*$&I8>"I&8DD7>7"I)&

Page 9: Discovery Report Prototype · 5 i. Data that can be used for Flood Risk Products Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of

7

C$($&"II&79%$($)%$+&79&I$"(9796&K8($&"B8L%&*8C&%8&?(8<7+$&DI88+&(7)J&79D8(K"%789&%8&($)7+$9%)M&&&'*7I$&%*$($&C$($&98&$;%($K$I#&I"(6$&)$978(&?8?LI"%789)&79&%*$&C"%$()*$+,&%*$($&7)&"&)$978(&>$9%$(&79&"%&I$")%&89$&>8KKL97%#M&&G9&"++7%789&%8&%*$&)%"9+"(+&57)J&[H!&>8KKL97>"%789)&)%("%$67$),&"&)K"II&8L%($">*&?8)%$(&89&%*$&BLII$%79&B8"(+&8D&%*$&)$978(&>$9%$()&C")&)L66$)%$+&")&"&688+&C"#&%8&("7)$&DI88+&(7)J&"C"($9$))&79&%*"%&+$K86("?*7>M&&$

CRS&/L(($9%I#,&89I#&U$K&/8L9%#&7)&79&%*$&/5Q&?(86("Kd&%*$#&"($&"I)8&%*$&89I#&>8KKL97%#&%*"%&?(8<7+$)&$+L>"%789"I&K"%$(7"I)&($6"(+796&DI88+&(7)J&%8&%*$7(&>7%7^$9)M&&H%&%*$&K$$%796,&%*$&6(8L?&+7)>L))$+&%*$&?8))7B7I7%#&8D&>8KKL97%7$)&C8(J796&%86$%*$(&%8&(8%"%$&?($?"("%789&8D&K"%$(7"I)&%*"%&>8LI+&B$&K"7I$+&%8&($)7+$9%)M&

Levees Horseshoe Bend has a large levee along the south side of the community. As stated

previously, the levee was not identified in the USACE’s National Levee Database or their

Mid-term Levee Inventory; however, the community noted that it currently is shown as

providing protection from the base flood. Currently, the community does not have

permanent easements so they can access the levee and perform maintenance. They have

struggled with property owners to obtain permanent rights to access the levees. FEMA or

the State may wish to consider providing support in this area – possibly host a public

meeting to educate residents about the risk of living behind levees and the value of

maintaining a levee or provide mediation services.

In addition, there are several levees in the watershed for which the communities will need

to look into obtaining documentation to meet 44 CFR 65.10. Specifically, it is suggested

that additional coordination with Horseshoe Bend, Emmett, and the City of Payette begin

as soon as possible to ensure the communities understand the mapping requirements for

levees and prepare the residents for the possibility that the levees will not be shown as

providing protection from the base flood. These levees were not included in the USACE

National Levee Database or Mid-term Levee Inventory. The communities did not indicate

that they had documentation at this time that the levees would meet 65.10 (the State

provided an October 1989 Eligibility Inspection Report for a Gem County levee). The

City of Payette suggested that they may have an earthen barrier that could be considered a

levee, but the location was not provided.

Floodplain Management/CAVs ="%"&>8II$>%$+&D(8K&/GQ&79+7>"%$+&%*"%&989$&8D&%*$&>8KKL97%7$)&79&!"#$%%$&'"%$()*$+&*"+&"9#&<"(7"9>$)&%8&%*$7(&DI88+?I"79&K"9"6$K$9%&8(+79"9>$),&)8&7%&K"#&B$&"))LK$+&%*"%&%*$&>8KKL97%7$)&"($&($6LI"%796&%8&"%&I$")%&%*$&K797KLK&>(7%$(7"&($ZL7($+&B#&PN[HM&&O*$&K8)%&($>$9%&/HVF/H/&<7)7%&C")&79&H?(7I&422i&C7%*&W87)$&/8L9%#,&?(78(&%8&%*"%&C")&"&P$B(L"(#&422R&<7)7%&C7%*&U$K&/8L9%#,&"9+&?(78(&%8&%*"%&%*$($&C$($&<7)7%)&79&4224&C7%*&!"#$%%$&X>7%#&"9+&>8L9%#Y&"9+&-8()$)*8$&W$9+M&&T89$&8D&%*$&DI88+?I"79&"+K797)%("%8()&($ZL$)%$+&"++7%789"I&%("79796&89&%*$7(&($)?89)7B7I7%7$)d&*8C$<$(,&K8($&D($ZL$9%&<7)7%)&K"#&B$&"??(8?(7"%$&%8&$9)L($&I8>"I&>8K?I7"9>$M&&&

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8

Regulatory Mapping Payette Watershed communities have not had recent map updates: the most current FIS is

from 1988 (Boise County and Horseshoe Bend). This, of course, excludes Washington

and Valley Counties; these counties chose not to participate in Discovery for the Payette

Watershed, given that small portion of these counties that are in the watershed are federal

lands and are uninhabited. The Payette River effective data is a combination of both

detailed and approximate analysis through the three main counties in the watershed

(Payette, Gem, and Boise Counties), with detailed data primarily in or adjacent to the

participating communities (Payette, Emmett, and Horseshoe Bend). Based on these dates

alone, new studies should be considered.

Risk MAP project in this watershed Horseshoe Bend, Emmett, and Payette (and Unincorporated Areas nearby) will need

additional outreach and education on levee issues, including PALs and 65.10 requirements.

The levees in these communities may not meet requirements for accreditation. In addition

to educating local officials about the PAL process, the communities would benefit from a

plan to distribute outreach materials to their residents on flood risk behind levees and the

grandfathering clause. The local officials stated that many residents will be included in the

Special Flood Hazard Area if levees are not accredited. $

Local officials in the communities were interested in the Discovery process and Risk MAP

and open to learning more about how they can begin to develop resiliency to flood events.

They identified several areas for map updates, and while they did not identify specific

mitigation projects, there are a few areas in which they could use additional FEMA

support. It is recommended that the guidance document outlining the types of Mitigation

Planning Technical Support that can be included in Risk MAP projects be evaluated with

communities, once finalized. $

G9&%*$&79%$(<7$C),&"II&>8KKL97%7$)&79+7>"%$+&%*"%&%*$#&C$($&79%$($)%$+&79&I$"(9796&K8($&"B8L%&57)J&[H!f)&>8KKL97>"%789)&)L??8(%,&"9+&C$($&8?$9&%8&"&DL%L($&K$$%796&C7%*&PN[H&%8&I$"(9&"B8L%&*8C&%*$#&>"9&7K?(8<$&%*$7(&DI88+&(7)J&>8KKL97>"%789&?(86("KM&&&$

O*$($&"($&I$<$$)&79&%*$&C"%$()*$+&%*"%&K"#&98%&K$$%&">>($+7%"%789&($ZL7($K$9%),&)8&%*$&797%7"%789&8D&I$<$$&8L%($">*&C$II&B$D8($&"9#&K"??796&?(8@$>%&B$679)&C8LI+&B$&B$9$D7>7"I&%8&%*$&($)7+$9%),&I8>"I&8DD7>7"I),&"9+&PN[H&79&"<87+796&>89DL)789&8(&"??$"I)M&&O*$&I8>"I&8DD7>7"I)&79&!"#$%%$&'"%$()*$+&C8LI+&B$9$D7%&D(8K&%*$&7K?I$K$9%"%789&8D&57)J&[H!&?(8@$>%),&"9+&C8LI+&C$I>8K$&K8($&PN[H&79<8I<$K$9%&79&%*$7(&DI88+?I"79&K"9"6$K$9%&?(86("K)M&

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N;"K?I$)&8D&>8KKL97%#&D">%&)*$$%),&K"?),&"9+&8%*$(&%88I)&L)$+&79&%*7)&=7)>8<$(#&$DD8(%&"($&)*8C9&89&%*$&D8II8C796&?"6$)M&$

<"2*$=.))*>$#"?)$%>$;0,$@)A$80B:*(>$'"()**)$+"*),-.)/$

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IV. Discovery Meeting H&C"%$()*$+SC7+$&=7)>8<$(#&[$$%796&C")&*$I+&%8&D">7I7%"%$&+7)>L))789&"B8L%&)%L+#&9$$+),&K7%76"%789&?(8@$>%&9$$+),&+$)7($+&>8K?I7"9>$&)L??8(%,&"9+&I8>"I&DI88+&(7)J&"C"($9$))&$DD8(%)M&&O*$&+7)>L))789&C")&)%7KLI"%$+&L)796&%*$&=7)>8<$(#&["?&+7)?I"#&8D&($I$<"9%&+"%"M&H%%$9+$$),&79>IL+796&"II&"DD$>%$+&>8KKL97%7$)&"9+&)$I$>%$+&8%*$(&)%"J$*8I+$(),&>88?$("%7<$I#&7+$9%7D7$+&)8IL%789)&D8(&%*$&H($")&8D&/89>$(9&)*8C9&89&%*$&=7)>8<$(#&[$$%796&["?M&&Q8IL%789)&79>IL+$+&($>8KK$9+"%789)&X"9+&?(78(7%7^"%789Y&8D&DI88+?I"79&)%L+7$),&K7%76"%789&?(8@$>%),&>8K?I7"9>$&7))L$),&"9+&7+$")&89&*8C&%8&7K?(8<$&%*$&I8>"I&DI88+&(7)J&>8KKL97>"%789&?(86("K)M&&&&Q769&79&)*$$%),&K$$%796&98%$),&"9+&8%*$(&+8>LK$9%"%789&8D&%*$&=7)>8<$(#&[$$%796&"($&I8>"%$+&79&%*$&"??$9+7;&%8&%*7)&+8>LK$9%&X89&"&/=YM&&&O*$&!"#$%%$&'"%$()*$+&=7)>8<$(#&$DD8(%&79<8I<$+&"9&"9"I#)7)&8D&%*$&+"%"&"9+&79D8(K"%789&>8II$>%$+&"9+&+7)>L))$+&"%&%*$&K$$%796,&"9+&($>8KK$9+"%789)&")&%8&%*$&DL%L($&($I"%789)*7?&"9+&">%7<7%7$)&B$%C$$9&PN[H&"9+&%*$&C"%$()*$+&>8KKL97%7$)M&&O*$&P79"I&=7)>8<$(#&["?&79+7>"%$)&+$)7($+&)%L+#&"($")&"9+&K7%76"%789&?(8@$>%&I8>"%789),&"9+&%*$&=7)>8<$(#&5$?8(%&?LII)&%86$%*$(&%*$&79D8(K"%789&>8II$>%$+&"9+&?(8<7+$)&($>8KK$9+"%789)M&&GD&"&57)J&[H!&?(8@$>%&7)&%8&B$&797%7"%$+&79&%*7)&C"%$()*$+,&=7)>8<$(#&C7II&B$&>89>IL+$+&C7%*&%*$&D79"I7^"%789&8D&"&?(8@$>%&)>8?$&"9+&)769$+&!(8@$>%&/*"(%$()&%*"%&79+7>"%$&%*"%&"II&"DD$>%$+&)%"J$*8I+$()&"6($$&%8&%*$&%$(K)&8D&"&DL9+$+&?(8@$>%,&79>IL+796&>8KKL97>"%789&"9+&+"%"&($)?89)7B7I7%7$)M&$$

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V. Appendix and Tables Included in CD &["?&0&j&!"#$%%$&'"%$()*$+&!(8@$>%&H($"&["?&["?&Q$%&4&j&G9%$(<7$C&5$D$($9>$&["?)&["?&e&j&!"#$%%$&'"%$()*$+&=7)>8<$(#&[$$%796&["?&["?&E&j&!"#$%%$&'"%$()*$+&P79"I&=7)>8<$(#&["?&&O"BI$&&j&="%"&/8II$>%789&O#?$)&D8(&5$6789&:&=7)>8<$(#&!(8@$>%)&&="%"&Q$%&0&S&Q?"%7"I&="%"B")$&D8(&!"#$%%$&'"%$()*$+&="%"&Q$%&4&j&O"BLI"(&="%"&D8(&!"#$%%$&'"%$()*$+,&79>IL+796&>89%">%)&&P">%&Q*$$%)&j&D8(&$">*&>8KKL97%#&G9%$(<7$C&T8%$)&j&D8(&$">*&>8KKL97%#&&=7)>8<$(#&[$$%796&T8%$)&&