C H L O R I D E C O N C E N T R A T I O N , I N M I L L I G R A M S P E R L I T E R ( m g / L )

G G’

H’

I’

J’

K’

H

I

J

K

A B C D E F

A’ B’ C’ D’ E’ F’

1

10

100

1,000

10,000

19391944

1949195419591964196919741979198419891994199920042006

Wells P-26 and P-26A

Well or sample depth, in feet: P-26 = 46.5, P-26A = 176.5

19391944

1949195419591964196919741979198419891994199920042006

Wells P-27 and P-27A

Well or sample depth, in feet: P-27 = 67.5, P-27A = 157

19391944

1949195419591964196919741979198419891994199920042006

Wells P-35 and P-35A

Well or sample depth, in feet: P-35 = 60, P-35A = 137

19391944

1949195419591964196919741979198419891994199920042006

Wells EB-11A, EB-11B, and EB-11C

Wells EB-58A, EB-58B, and EB-58C Wells EB-13A, EB-13B, and EB-13C,

Well or sample depth, in feet: EB-11A = 46, EB-11B = 79.5, EB-11C = 196

19391944

1949195419591964196919741979198419891994199920042006

EB-19A, EB-19B, IW-14A, and IW-14C

Well or sample depth, in feet: EB-19A = 30, EB-19B = 78, IW-14A = 43, IW-14C = 140

Wells EB-57A and EB-57B

Well or sample depth, in feet: EB-57A = 61, EB-57B = 115

Wells P-28 and P-28A

Well or sample depth, in feet: P-28 = 63, P-28A = 92.5

Wells EB-7A, EB-7B, and EB-7C

Well or sample depth, in feet: EB-7A = 45, EB-7B = 75, EB-7C = 107

1

10

100

1,000

10,000 Wells EB-1AA, EB-1A, and EB-1B

P-26

P-26A

Well or sample depth, in feet: EB-1AA = 46, EB-1A = 100, EB-1B = 150 

1

10

100

1,000

10,000 Wells EB-44A, EB-44B, and EB-44C

Well or sample depth, in feet: EB-44A = 52, EB-44B = 90, EB-44C = 182

1

10

100

1,000

10,000 Wells EB-43AA, EB-43A, EB-43B, and EB-43C

Well or sample depth, in feet: EB-58A = 43, EB-58B = 95, EB-58C = 125 Well or sample depth, in feet: EB-13A = 30, EB-13B = 90, EB-13C = 235

Wells EB-12A, EB-12B, EB-12C, IW-13A, and IW-13C 1939 1944 1949 1954 1959 1964 1969 1974 1979 1984 1989 1994

199920042006

Well or sample depth, in feet: EB-12A = 30, EB-12B = 90, EB-12C = 235, IW-13A = 30, and IW-13C = 90

Wells P-29 and P-29A

Well or sample depth, in feet: P-29 = 40.5, P-29A = 101.5

Wells EB-8A, EB-8B, EB-8C, IW-08A, and IW-08C

Well or sample depth, in feet: EB-8A = 40, EB-8B = 155, EB-8C = 210, IW-08A = 28, IW-08C = 148

Wells EB-9A, EB-9B, EB-9C, IW-04A, and IW-04C

Well or sample depth, in feet: EB-9A = 45, EB-9B = 102, EB-9C = 255, IW-04A = 20, IW-04C = 204

Wells EB-16A, EB-16B, EB-16C, IW-05A, and IW-05C

Well or sample depth, in feet: EB-16A = 45, EB-16B = 125, EB-16C = 246, IW-05A = 55, IW-05C = 180

1

10

100

1,000

10,000 Wells EB-2A, EB-2B, and EB-2C

Well or sample depth, in feet: EB-2A = 37, EB-2B = 65, EB-2C = 235

1

10

100

1,000

10,000 Wells P-32 and P-32A

Well or sample depth, in feet: P-32 = 35, P-32A = 83

EB-14A, EB-14B, EB-14C, IW-09A, and IW-09C

Well or sample depth, in feet: EB-14A = 40, EB-14B = 125, EB-14C = 285, IW-09A = 43, IW-09C = 243

Wells EB-10A, EB-10B, and EB-10C

Well or sample depth, in feet: EB-10A = 66, EB-10B = 152, EB-10C = 236

Wells EB-17A, EB-17B, and EB-17C

1

10

100

1,000

10,000 Wells EB-5AA, EB-5A, and EB-5B

Well or sample depth, in feet: EB-5AA = 18, EB-5A = 55, EB-5B = 180

Wells EB-56A, EB-56B, and EB-56C

Well or sample depth, in feet: EB-56A = 70, EB-56B = 113, EB-56C = 198

Wells P-30 and P-30A

Well or sample depth, in feet: P-30 = 76.5, P-30A = 126

Wells EB-3AA, EB-3A, and EB-3B

Well or sample depth, in feet: EB-3AA = 35, EB-3A = 77, EB-3B = 173

Wells EB-15A, EB-15B, EB-15C, EB-20A, and EB-20B

Well or sample depth, in feet: EB-15A = 64, EB-15B = 101, EB-15C = 270, EB-20A = 53, EB-20B = 105

Well or sample depth, in feet: EB-43AA = 35, EB-43A = 60, EB-34B = 80 EB-43C = 131 

Wells EB-4AA, EB-4A, and EB-4B

Well or sample depth, in feet: EB-4AA = 50,

 EB-4A = 73, EB-4B = 145

Wells P-31 and P-31A

Well or sample depth, in feet: P-31 = 40, P-31A = 67.5

Well or sample depth, in feet: EB-17A = 47.5, EB-17B = 146, EB-17C = 253

Wells EB-21A and EB-21B

Well or sample depth, in feet: EB-21A = 109.5, EB-21B = 137

Wells IW-02A and IW-02C

Well or sample depth, in feet: IW-02A = 21, IW-02C = 85

EB-1AA

EB-1A EB-1B

EB-44A EB-44B

EB-44C

EB-43A

EB-43B

EB-43AA

EB-43C

U.S. Environmental Protection 

Agency (2006a) Secondary 

Drinking Water Regulation, 250 mg/L

EB-5AA

EB-5A

EB-5B

EB-4B

EB-3AA

EB-4A EB-57B

EB-56A

EB-56B

EB-56C

EB-3A

EB-2A

EB-58C

EB-58B

EB-58A

EB-4AA EB-57A

EB-3B

EB-2C

EB-2B

EB-7A

EB-11A

EB-11B

EB-7B

EB-7C

EB-11C P-27

P-27A

P-35

P-35A

P-28

P-28A

P-32A

P-32

P-31

P-31A

P-30

P-30A

P-29

P-29A

EB-21A

EB-21B

EB-10A

EB-10B

EB-10C

EB-17B EB-17C

EB-17A

EB-9A

EB-9B

EB-9C IW-04A

IW-04C

EB-13A

EB-13B

EB-13C

EB-8A

EB-8B EB-8C

IW-08A

IW-08C

EB-19A

EB-19B

IW-14A

IW-14C

IW-02A

IW-02C

EB16-A

EB-16B EB-16C

IW-05A

IW-05C

EB-20A

EB-15A

EB-15B

EB-15C

EB-20B

EB-14A

EB-14B

EB-14C IW-09A

IW-09C

EB-12B

EB-12A EB-12C

IW-13C

IW-13A

B.

Figure 15. Changes in chloride concentrations in the Equus Beds aquifer near Burrton, Kansas, during 1939–2005 (“EB” well and recent “P” well chloride concentration data from Mike Dealy, Manager, Equus Beds Groundwater Management District No. 2, written commun. 2006).—Continued

 Water Quality of the Equus Beds Aquifer and Little Arkansas River, 1995–2005 37