WSPC04137

• File Number: 8272
• Description: Colorado River - Colorado River Basin Salinity Control Program - CRBSCP
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 2/1/1995
• Author: Aneth
• Title: Geochemical Progress - Navajo Sandstone in Water Canyon Narrows - Utah - Aneth Progress Report
• Water Supply Pro - Doc Type: Report/Study

I) V ~I.J.J

"

GROUP ONE CLUSTER IDENTIFIES WELLS
.COMPLETED IN UPPER PALEOZOIC AQUIFER
AND WELLS COMPLETED IN THE NAVAJO
AQUIFER

Separation of the OFB samples from group
1 and 2 clusters comaining samples from
the Navajo aquifer indicates thaI OFB is
not the salinity source to the Navajo
aquifer. If OFB was a contributing salinity
source to the !'Javajo aquifer. a clustering
with the more saline wells from the Navajo
aquifer would be expected. The clustering
of 3 wells from the Upper Paleozoic
aquifer with 15 well~ from the Navajo
aquifer (group I) confirm previous resuhs
that water from the Upper Paleozoic
aquifer may be a source of salinity to areas
. of the Navajo aquifer. The majority of
group I wells completed in the Navajo
aquifer are within the area where the
potential for upward movement from the
Upper Paleozoic aquifer IS favorable
(adjacent tigure), indicating further that the
Upper Paleozoic aqulfer is a geochemically
and hydrologically reasonable source of
salinity. Navajo aquifer wells in the group 2
cluster are generally located outside lhe
area for upward movement of water from
the Upper Paleozoic aquifer.
Dissolved-solids concentration of Navajo
aquifer wells belonging to the group I
cluster range from 1.970 to 12.200 mgll.
(adjacent figure), wllh a median value of
7.620 mgfL. Sav3Jo aqUifer wells In group
2 contain 100~'er du;;solved.soJids
concentration ranging from 150 to 3.740
mglL \\ jth a median value of 1.050 mg/L

.

37.5

.

.

37.4 f-

Area where hydraulic
gradient IS favorable
Iorupwardwalel
rroven-enllromthe

.

(1.970)
,
.

Upper PaleOZOIC
aQullerSlolhe
.... NavajoaQurfer
file {freelheyand
Cordi::...~91}
- -
/'6.(4,600) "-
./ !C, \
~.OOQ, ~.7.0}", !C,
~ l\ .(11.500)
. (l.600{ '!B.500)! !B.800)
· !C,{8.900} ^
. / ~
. 15.760)6,... / (11.800)
--

-

37.3 I- .

!C,
('2200)

...

37.2 f-

(6240~
I
/
/
I
,

.

~--
6. (11.400) .
37.1 !C,
\4.860)
.
. .
37.0
109.5 I09A 109.3 109.2 109.1 109.0
EJCI'\JfiAllCt<
!C, \8.900)Group one _II c~led in rQ\/IIto .quie~-
Nurmer by syrrtlOt ,s dlssolved'sohds
concentraton. In mlhgfamsper hter
. Group two_II c~ted in Navajo aquier

Aneth Progress Report--Fehnlllr\' /995