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<br />TABLE 7. CHEMICAL COMPOSITION, GROUND WATER
<br /> VIRGIN VALLEY SUBEVALUATION UNIT, ARIZONA, NEVADA, UTAH
<br /> ConI~1tuHt
<br /> Spec1f1c
<br /> . . ~ ~ . HCO; 50.Z ., ".-t.
<br />LocIt1C11l 0... .. . , " " C1 110, T1IS ~'It ""
<br /> .
<br /> \~craC10ftlftIl9l10rp., 'II r-
<br />5' Au9M" Hole -1I 11/01/79 1737 ... on ... ,... '427 m. ,. l1!J71 "... 11.0
<br />14I'Q111te 1""1,et1aft A....
<br />5'~ttol.. !I 11/0117' ... " ... ... '" !GO ".. .. .... m. ',7
<br />8......111. [l"I"igltfon ...,...
<br />Dl"llll01tdl- !I l1(06l79 312. '" 7,. ... J"2 '" "'. " ".n ,,"'" 18.0
<br />aunt."tll.1~...t10l1A....
<br /> l/ 11/1411' " '71 .. " ... ,.. ... '200 "
<br />OS/7G-l4eZ
<br /> l/ 11/14/17 17 " " It no no
<br />oem-lIed
<br />l/ 11115117 " 14 " " '17 " ,OO "" ,I
<br />lOIet-7bO
<br /> l/ 11115'" '" ,.. ,.. no zoo '''. ".. .... 5.1
<br />13110 - 13ddd
<br />l/ 11/15167 ,.. ,.. .. " ,.. ... '1lOO '!GO ',I
<br />13/10-321
<br /> l/ 1111111' lIS '12 .. '74 ", ,.. ,,.. ".. 5,0
<br />13110-31(:1
<br /> l/ 11111167 '" "0 ,.. '0' 14' 1510 ,... .... 7,'
<br />13170-34c1
<br /> l/ 11110117 .. .. " " .,. !to
<br />13110 - Jkddl
<br /> l/ 11/10/.7 .. " .. '21 ... 7311
<br />U/1'Q - 35cc1dZ
<br />13/71.1Uil 11111117 4ft ... '17 ,,. ... ",. "'" - ',0
<br />
<br />"
<br />
<br />,~
<br />
<br />SCtlRCE; 1/. CHltcal c.,n1t1ll1t '1'II1Ylld It tIM us Siltft;c)' L..,..tGl")'.
<br />y State of Hftacil. WItH' IlHOIlrc..-RlCOMltsUlW:' R..r't No. 51.
<br />
<br />,;.
<br />
<br />C. R. Longwell (1965) shows Quantemary alluvium and Tertiary Muddy
<br />Creek Formation underlying the Virgin River (including irrigated land)
<br />from Mesquite, Nevada to the Overton Arm of Lake Mead (see Appendix D
<br />for det,iled geologic map). Patrick A. Glancy and A. S. Van Denburgh
<br />(1969)1 show the alluvium and Muddy Creek formation cropping out along
<br />the Virgin River from the Overton Arm to about five miles up river
<br />from Littlefield, Arizona.
<br />
<br />Patrick A. Glancy and A. S. Van Denburgh (1969) relate the saline
<br />character of the Muddy Creek formation to groundwater as follows:
<br />
<br />~~
<br />
<br />"Sampled groundwater along the Virgin River shows
<br />the influence of geologic units, particularly the
<br />Muddy Creek formation (Table 2), which contain
<br />soluble minerals such as halite (sodium chloride)
<br />and gypsum (calcium sulfate). Most of these waters
<br />contain 1,000 to 5,000 mg/l (milligrams per liter)
<br />of dissolved solids."
<br />
<br />Salinity measurements from selected wells; as shown in Figure 6,
<br />show the effect of mixing of saline ground water from the Muddy Creek
<br />formation with saline ground wat~r in the alluvium. Deep percolating
<br />irrigation water can pick up salt from the underlying saline Muddy
<br />Creek formation/alluvium aquifer.
<br />
<br />1/
<br />
<br />State of Nevada, Water Resources-Reconnaissance Series,
<br />
<br />14
<br />
<br />Report 51.
<br />000271
<br />
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