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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
!"#$%&'(&)'*+%*+,&
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!
1
I. General Information 5$6789&:&797%7"%$+&"9&$;%$9)7<$&=7)>8<$(#&?(8@$>%&79&A>%8B$(&4202,&C7%*&%*$&=7)>8<$(#&8D&4E&C"%$()*$+)F?(8@$>%&"($")&79&G+"*8,&A($689,&'")*796%89,&"9+&HI")J",&79<8I<796&"IK8)%&422&>8KKL97%7$)M&&N))$9%7"II#&"&?7I8%&?(8@$>%&D8(&%*$&=7)>8<$(#&?(8>$))&7%)$ID,&%*$&5:&=7)>8<$(#&79<8I<$+&+"%"&>8II$>%789,&>8KKL97%#&79%$(<7$C),&"&K$$%796&C7%*&)%"J$*8I+$()&79&%*$&C"%$()*$+,&"9+&+$<$I8?K$9%&8D&($>8KK$9+"%789)&B")$+&89&"9&"9"I#)7)&8D&+"%"&"9+&79D8(K"%789&6"%*$($+&%*(8L6*8L%&%*$&?(8>$))M&&&&O*$&5$6789&:&=7)>8<$(#&+"%"&>8II$>%789&$9%"7I$+&"&K"))7<$&>8II$>%789&8D&%"BLI"(&"9+&)?"%7"I&+"%"&D8(&"II&>8KKL97%7$)&D(8K&P$+$("I&"9+&Q%"%$&)8L(>$),&")&C$II&")&79D8(K"%789&>8II$>%$+&%*(8L6*&79%$(<7$C)&C7%*&$">*&>8KKL97%#M&&O*$&%"BI$&79&Q$>%789&GGG&I7)%)&%*$&%#?$)&8D&+"%"&%*"%&%*$&?(8@$>%&%$"K&>8II$>%$+&D8(&%*$&!"#$%%$&'"%$()*$+M&&&&O*$&!"#$%%$&'"%$()*$+&7)&I8>"%$+&79&)8L%*C$)%$(9&G+"*8,&C*$($&%*$&R4SK7I$&!"#$%%$&57<$(&$9%$()&%*$&Q9"J$&57<$(&"%&%*$&G+"*8FA($689&B8(+$(M&&O*$&?(79>7?"I&%(7BL%"(7$)&%8&%*$&!"#$%%$&57<$(&"($&%*$&T8(%*&P8(J&!"#$%%$&57<$(&"9+&Q8L%*&P8(J&!"#$%%$&57<$(M&&O*$&*$"+C"%$()&8(7679"%$&79&%*$&Q"C%88%*&"9+&Q"IK89&57<$(&K8L9%"79)M&&!(7K"(7I#&>8K?(7)$+&8D&U$K&/8L9%#,&"&)7697D7>"9%&?8(%789&8D&!"#$%%$&/8L9%#&7)&79&%*$&!"#$%%$&'"%$()*$+,&"I896&C7%*&)K"II&"($")&8D&'")*796%89,&V"II$#,&"9+&W87)$&/8L9%7$)M&&G9&"++7%789&%8&%*$&98%$+&>8L9%7$),&%*$&79>8(?8("%$+&>8KKL97%7$)&8D&-8()$)*8$&W$9+,&NKK$%%,&"9+&!"#$%%$&"($&"I)8&?"(%7>7?"%796&79&%*$&T"%789"I&PI88+&G9)L("9>$&!(86("K&XTPG!YM&&&&&&&&&&&&&&&&&&&&&&&&&&&&
2
!"#$%&$'"()**)$+"*),-.)/$',01)2*$3,)"$!"#$
3
II. Watershed Stakeholder Coordination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
III. Data Analysis H&I7)%&8D&%*$&+"%"&>8II$>%$+,&%*$&+$I7<$("BI$&8(&?(8+L>%&79&C*7>*&%*$&+"%"&"($&79>IL+$+,&"9+&%*$&)8L(>$&8D&%*$&+"%"&7)&)*8C9&79&O"BI$&0M&&G9&"++7%789,&="%"&H9"I#)7)&7)&+7<7+$+&B$%C$$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&
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;>$I&)?($"+)*$$%& c8>"I&C$B)7%$),&Q%"%$FPN[H&L?+"%$)&
$
&&
5
i. Data that can be used for Flood Risk Products
Topographic Data As shown on the Final Discovery Map, LiDAR is being collected for the main stem of the
Payette River from the confluence with Snake River to just north of Horseshoe Bend. The
LiDAR was expected to be flown in late 2010 and would likely be available for a fall 2011
project.
ii. Other Data and Information
Mitigation Plans/Status, Mitigation Projects [7%76"%789&?I"9)&79&G+"*8&"($&?($?"($+&B#&%*$&>8L9%7$)&")&HIIS-"^"(+&!I"9)&D8(&"II&%*$&79>8(?8("%$+&"9+&L979>8(?8("%$+&>8KKL97%7$)&C7%*79&%*$&>8L9%#M&&G9&!"#$%%$&'"%$()*$+,&%*$&>8KKL97%7$)&79+7>"%$+&%*"%&%*$#&+7+&98%&>89%(7BL%$&%8&%*$&>8L9%#&?I"9)M&&W87)$&/8L9%#&X"9+&-8()$)*8$&W$9+Y&K7%76"%789&?I"9&L?+"%$)&"($&+L$&79&T8<$KB$(&4200d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
CNMS and NFIP Mapping Study Needs O*$&/T[Q&+"%"&)L66$)%$+&%*"%&"&>89)7+$("BI$&9LKB$(&8D&DI88+796&)8L(>$)&79&%*$&C"%$()*$+&)*8LI+&B$&L?+"%$+M&&T8&>I"7K)&C$($&7+$9%7D7$+&79&%*$&W,&/,&8(&:&^89$),&"9+&%*$&>8KKL97%7$)&+7+&98%&7+$9%7D#&"9#&>IL)%$()&8D&cA[HFcA[5SP)&XB8%*&8D&C*7>*&K"#&79+7>"%$&"&9$$+&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
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($$M&&H)&8D&4222,&@L)%&L9+$(&R2g&8D&($)7+$9%)&8<$(&"6$&0R&%*"%&+$)7($+&$K?I8#K$9%&C$($&C8(J796,&C7%*&"&K$+7"9&79>8K$&@L)%&8<$(&he2,222&"99L"II#M&&5$)7+$9%)&">(8))&%*$&C"%$()*$+&C8(J$+&?(7K"(7I#&79&K"9LD">%L(796d&$+L>"%789"I,&*$"I%*,&"9+&)8>7"I&)$(<7>$)d&"9+&($%"7I&%("+$M&&O*$($&C")&98%*796&8L%)%"9+796&79&%*$&+$K86("?*7>)&+"%"&%8&79+7>"%$&%*"%&)?$>7"I&8L%($">*&)%("%$67$)&C8LI+&B$&9$>$))"(#&D8(&%*$&>8KKL97%7$)&79&!"#$%%$&'"%$()*$+M&&O*$&I8>"I&8DD7>7"I)&
7
C$($&"II&79%$($)%$+&79&I$"(9796&K8($&"B8L%&*8C&%8&?(8<7+$&DI88+&(7)J&79D8(K"%789&%8&($)7+$9%)M&&&'*7I$&%*$($&C$($&98&$;%($K$I#&I"(6$&)$978(&?8?LI"%789)&79&%*$&C"%$()*$+,&%*$($&7)&"&)$978(&>$9%$(&79&"%&I$")%&89$&>8KKL97%#M&&G9&"++7%789&%8&%*$&)%"9+"(+&57)J&[H!&>8KKL97>"%789)&)%("%$67$),&"&)K"II&8L%($">*&?8)%$(&89&%*$&BLII$%79&B8"(+&8D&%*$&)$978(&>$9%$()&C")&)L66$)%$+&")&"&688+&C"#&%8&("7)$&DI88+&(7)J&"C"($9$))&79&%*"%&+$K86("?*7>M&&$
CRS&/L(($9%I#,&89I#&U$K&/8L9%#&7)&79&%*$&/5Q&?(86("Kd&%*$#&"($&"I)8&%*$&89I#&>8KKL97%#&%*"%&?(8<7+$)&$+L>"%789"I&K"%$(7"I)&($6"(+796&DI88+&(7)J&%8&%*$7(&>7%7^$9)M&&H%&%*$&K$$%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&&&
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. $
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O*$($&"($&I$<$$)&79&%*$&C"%$()*$+&%*"%&K"#&98%&K$$%&">>($+7%"%789&($ZL7($K$9%),&)8&%*$&797%7"%789&8D&I$<$$&8L%($">*&C$II&B$D8($&"9#&K"??796&?(8@$>%&B$679)&C8LI+&B$&B$9$D7>7"I&%8&%*$&($)7+$9%),&I8>"I&8DD7>7"I),&"9+&PN[H&79&"<87+796&>89DL)789&8(&"??$"I)M&&O*$&I8>"I&8DD7>7"I)&79&!"#$%%$&'"%$()*$+&C8LI+&B$9$D7%&D(8K&%*$&7K?I$K$9%"%789&8D&57)J&[H!&?(8@$>%),&"9+&C8LI+&C$I>8K$&K8($&PN[H&79<8I<$K$9%&79&%*$7(&DI88+?I"79&K"9"6$K$9%&?(86("K)M&
Other Support Requested H98%*$(&"($"&79&C*7>*&%*$&>8KKL97%7$)&79&!"#$%%$&'"%$()*$+&C8LI+&B$9$D7%&D(8K&PN[H&8(&Q%"%$&)L??8(%&7)&C7%*&%*$&7((76"%789&+7%>*&*$"+6"%$)M&&O*$($&7)&>L(($9%I#&98&)#)%$K&8(&($ZL7($K$9%)&D8(&%*$&*$"+6"%$)&%8&B$&>I8)$+,&8(&8?$9$+,&+L(796&"&DI88+&$<$9%d&*8C$<$(,&"9&8?$9&7((76"%789&+7%>*&>8LI+&($S(8L%$&DI88+C"%$()&%8&I8>"%789)&D"(&D(8K&%*$&DI88+796&)8L(>$M&&O*7)&7)&"&L97ZL$&7))L$&79&!"#$%%$&'"%$()*$+&X"9+&?8))7BI#&8%*$(&G+"*8&C"%$()*$+)Y&%*"%&
9
C"(("9%)&"++7%789"I&>89)7+$("%789M&&A9$&)L66$)%789&79>IL+$+&+8>LK$9%796&"&)#)%$K&79&%*$&HIIS-"^"(+&[7%76"%789&?I"9)M&&$
N;"K?I$)&8D&>8KKL97%#&D">%&)*$$%),&K"?),&"9+&8%*$(&%88I)&L)$+&79&%*7)&=7)>8<$(#&$DD8(%&"($&)*8C9&89&%*$&D8II8C796&?"6$)M&$
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12
IV. Discovery Meeting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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%$)&&