Jared D. Abraham, Senior Research Geophysicist

Clint Carney, P.G. Hydrologist

James C. Cannia P.G., Senior Geologist

Exploration Resources International Geophysics

AEM mapping of groundwater resources within the glacial deposits and Cretaceous Dakota Formation of

eastern Nebraska

!"#$%&'()*"+("#$%&+,-("./#%0+%*1

•!'2345+672893:+;<<74<1

•!=28:+>?@4<9A+B4CC<+D2>+54>7A4>+?5+8?+2EFCF3:+3?+G7@G+F8+HIJH1

•!,?8A458+?K45+@78FAFG2C+B4CC<1

•!L45:+CF@F34>+F8M?5@29?8+?8+C?A2C+N4?C?N:O+P+A459Q4>+34<3+D?C4<1

•!-?A298N+84B+34<3+D?C4<1

•!&4K4C?GF8N+2+84B+D:>5?N4?C?NFA+M52@4B?5R1

#$)-;%*1•!67FAR+54KF4B+?M+(*=+28>+NC2AF2C+<4>F@483<1

•!-?A29?8+?M+<75K4:1

•!'4CC<+28>+E?54D?C4+A?835?C1

•!S&+!4?C?NFA2C+@?>4C+M5?@+3D4+N4?GD:<FA<+28>+E?54D?C4<1

•!T4>5?AR1

•!672345825:+2U7FM45VG5F8AFGC4+2U7FM451

•!,5432A4?7<+&2R?32+2U7FM451

•!,?8AC7<F?8<1

1

(;"T#"%*+*-*,)"#=(!%*);,+W(*=X+/$"L*Y/1•! !"#$%&'("')"*'++$*,-."/-)'0#1,'-"12'3%"*&1-.$4"/-"$+$*%0/*1+"0$4/4,5/%6"2$-$1%&"%&$"+1-("430)1*$"%&1%"*1-"2$"0$+1%$("%'"+/%&'+'.6"/-"1".$'471,1++6"0$)$0$-*$("(1%14$%""

•! 81%1"7'/-%4"471*/-."/4"&/.&"•! 9'-"/-514/5$"•! :'4%"$;$*,5$"*'#710$("%'"(0/++/-."1+'-$"

•! 8$4/.-$("%'"*'5$0"+10.$"10$14"<3/*=+6"

•! >;$*,5$"?&$0$"41-(4"1-(".015$+"10$"/-%$0+16$0$(""?/%&"4/+%"1-("*+16"

!*#-#!Y+(%&+-;)Z#-#!Y1

Gravel and sand within a Glacial Till

Clay rich glacial till with a drop stone

*-*,)";,(-+["#[*");*/1

High Resistivity >25 ohm-m

•! sand or gravels (aquifer)

Low Resistivity < 15 ohm-m -

•! clays and silts (aquitard)

Many combinations exist

-#,();#%+';)Z;%+-#'*"+*-.Z#"%+%()$"(-+"*/#$",*/+&;/)";,)1

-#,();#%/+#\+"*!;/)*"*&+'*--/+TY+$/*+(%&+,/&+)*/)+Z#-*/+;%+)Z*+["#]*,)+("*(+1

#T/*"L*&+'()*"+-*L*-/+()+\;L*+-#,();#%/+["#L;&*&+TY+)Z*+-#'*"+*-.Z#"%+%"&+\#"+)Z*+HII^OHIJS+);=*+[*";#&+1

;%L*"/;#%+&()(+=;/\;)1Spatially Constrained Inversion (SCI) (Viezzoli and others, 2008) Aarhus Workbench version 4.1.1.765

"*/;/);L;)Y+(%&+)Z*+-;)Z#-#!;,+,-(//;\;,();#%/+()+T#"*Z#-*+-#!+-#,();#%/1

'*/)+)#+*(/)+,"#//+/*,);#%+(-#%!+)Z*+/#$)Z*"%+);*O-;%*+1

'*/)+)#+*(/)+,"#//+/*,);#%+(-#%!+)Z*+%#")Z*"%+);*O-;%*+1

/#$)Z+)#+%#")Z+,"#//+/*,);#%+(-#%!+(+\-;!Z)+-;%*+*(/)+#\+,-("./#%+1

/#$)Z+)#+%#")Z+,"#//+/*,);#%+(-#%!+(+\-;!Z)+-;%*+*(/)+#\+,-("./#%+(%&+'*/)+#\+Z#'*--/+1

SO&+L#_*-+#\+(--+6$()*"%("Y+&*[#/;)/+(T#L*+T*&"#,.+1

Horizontal clip in the southwest quarter of the project area

,"*)(,*#$/+T*&"#,.+)#[#!"([ZY+T*%*()Z+6$()*"%("Y+&*[#/;)/+1

JP0+HI0+(%&+HP+#Z=O=+"*/;/);L;)Y+/$"\(,*/+#L*"-Y;%!+)Z*+,"*)(,*#$/+T*&"#,.+/$"\(,*+1

HI+#Z=O=+#"+!"*()*"+#L*"-Y;%!+)Z*+,"*)(,*#$/+T*&"#,.+/$"\(,*+1

)Z;,.%*//+#\+[";%,;[(-+(6$;\*"+("*(+';)Z+"*/;/);L;)Y+-*L*-/+()+HI+#Z=O=+#"+!"*()*"+1!770'@/#1%$+6"ABACD"#/++/'-"*32/*"#$%$04"EAFGHGFI"1*0$J)''%K"')"0$*'5$012+$".0'3-(?1%$0"E?&$-"41%301%$(K"

"*/;/);L;)Y+#\+)Z*+,"*)(,*#$/+T*&"#,.+$%;)/+T*%*()Z+)Z*+6$()*"%("Y+/Y/)*=+(%&+[";%,;[(-+(6$;\*"+1

,#%,-$/;#%/1•! L/#/%$(".0'3-(?1%$0"$@/4%4"/-"70'M$*%"10$1"•! !<3/)$04"10$"(/4*'-,-3'34"1-("+/#/%$("/-"4/N$"•! !770'@/#1%$+6"ABACD"#/++/'-"*32/*"#$%$04"EAFGHGFI"1*0$J)''%K"')"0$*'5$012+$".0'3-(?1%$0"E?&$-"41%301%$(K"

•! 91%30$"')"%&$"#177$("1<3/)$04"+$("%'"%&$"OFAO"($*+/-$4"*'#2/-$("?/%&"%&$"1443#$("/-*0$14$"/-"73#71.$"(3$"%'"(0'3.&%"

•! P'%$-,1+")'0"-$?"4377+/$4"/-":0$%1*$'34"81='%1"2$(0'*="•! !>Q"/4"%&$"2$4%"7'44/2+$"%''+"%'"/#70'5$"3-($04%1-(/-."')"%&$"&6(0'.$'+'./*")01#$?'0="

)Z(%.+Y#$1

LOWER ELKHORN NATURAL RESOURCES DISTRICT, NEBRASKA Point of Contact: Rick Wozniak, Water Resources Manager rwozniak@lenrd.org (402) 371-7313

Jared D. Abraham Senior Research Geophysicist XRI Geophysics, LLC 14828 Unit 3B, W 6th Ave Golden, CO 80401 +1 303-263-8318 Jared.Abraham@xrigeo.com

,#=[(";/#%+#\+)*/)+Z#-*+-#!+)#+(*=+&()(1Comparison of the resistivity values from test hole 16 inch normal log of 02-LE-13 (blue line) and an inverted forward modeled response from that log using the SkyTEM 304 system characteristics and inversion settings (red dashed line).