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WATER-QUALITY DATA FOR THE RIO GRANDE BETWEEN PICACHO BRIDGE NEAR LAS CRUCES AND CALLE DEL NORTE BRIDGE NEAR MESILLA, NEW MEXICO, 1996-97
By G.F. Huff
U.S. GEOLOGICAL SURVEY
Open-File Report 98-66
Prepared in cooperation with the
CITY OF LAS CRUCES
Albuquerque, New Mexico 1998
U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary
U.S. GEOLOGICAL SURVEY
Thomas J. Casadevall, Acting Director
The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.
For additional information write to:
District ChiefU.S. Geological SurveyWater Resources Division4501 Indian School Road NE, Suite 200Albuquerque, NM 87110-3929
Copies of this report can be purchased from:
U.S. Geological Survey Branch of Information Services Box 25286 Denver, CO 80225-0286
CONTENTS
PageAbstract.................................................................................................................................................................................. 1Introduction ................................................................................................................................................................^ 1
Purpose and scope ....................................................................................................................................................... 1Study area..........................................................................^ 1Previous investigations................................................................................................................................................ 3Sampling and analysis methods and protocols............................................................................................................ 3
Water-quality data.................................................................................................................................................................. 3Quality control.........................................................................................................................................................^ 4References cited..................................................................................................................................................................... 5
FIGURE
1. Map showing sampling locations..................................................................................................................................... 2
TABLES
1. Method detection limits for, minimum reporting levels for, and references documenting laboratory analyticalmethods used in this study......................................................................................................................................... 6
2. Analytical results on environmental samples collected from the Rio Grande at Picacho Bridge nearLasCruces, New Mexico........................................................................................................................................... 8
3. Analytical results on replicate samples collected from the Rio Grande at Picacho Bridge near Las Cruces,New Mexico .............................................................................................................................................................. 12
4. Analytical results on ambient blanks collected from the Rio Grande at Picacho Bridge near Las Cruces,New Mexico .............................................................................................................................................................. 14
5. Analytical results on environmental samples collected at the City of Las Cruces wastewater-treatment plant............ 166. Analytical results on split samples collected at the City of Las Cruces wastewater-treatment plant............................. 207. Analytical results on ambient blanks collected at the City of Las Cruces wastewater-treatment plant......................... 238. Analytical results on environmental samples collected from the Rio Grande at Calle del Norte Bridge near
Mesilla, New Mexico ................................................................................................................................................ 259. Analytical results on replicate samples collected from the Rio Grande at Calle del Norte Bridge near
Mesilla, New Mexico ................................................................................................................................................ 2910. Analytical results on ambient blanks collected from the Rio Grande at Calle del Norte Bridge near Mesilla,
New Mexico .............................................................................................................................................................. 3111. Analytical results on equipment blanks.......................................................................................................................... 3312. Absolute and relative differences between selected constituents in environmental and replicate samples
collected from the Rio Grande at Picacho Bridge near Las Cruces, New Mexico.................................................... 3613. Absolute and relative differences between selected constituents in environmental and split samples collected
at the City of Las Cruces wastewater-treatment plant............................................................................................... 3814. Absolute and relative differences between selected constituents in environmental and replicate samples
collected from the Rio Grande at Calle del Norte Bridge near Mesilla, New Mexico.............................................. 3915. Spike recoveries in environmental samples collected at the City of Las Cruces wastewater-treatment plant............... 4116. Minimum, median, and maximum values for constituents in all ambient blanks in which at least one analysis
exceeds the minimum reporting level for that constituent........................................................................................ 4517. Minimum, median, and maximum values for constituents in all equipment blanks in which at least one analysis
exceeds the minimum reporting level for that constituent........................................................................................ 4618. Recoveries in standard reference water samples............................................................................................................ 47
iii Contents
WATER-QUALITY DATA FOR THE RIO GRANDE BETWEEN PICACHO BRIDGE NEAR LAS CRUCES AND CALLE DEL NORTE BRIDGE NEAR MESILLA, NEW MEXICO, 1996-97
ByG.F. Huff
ABSTRACT
The City of Las Cruces is concerned about water quality in a reach of the Rio Grande that receives outfall from the City of Las Cruces wastewater-treatment plant. Water-quality samples were collected from the Rio Grande at Picacho Bridge near Las Cruces, New Mexico; from the sampling site at the City of Las Cruces wastewater-treatment plant; and from the Rio Grande at Calle del Norte Bridge near Mesilla, New Mexico. The samples were collected on 12 days from August 6, 1996, to February 28, 1997, and were analyzed for a suite of dissolved and total constituents including trace metals. Instantaneous stream discharge was measured concurrently with collection of the Rio Grande samples. At the wastewater-treatment plant, the City of Las Cruces provided instantaneous discharge rates concurrent with sampling. Quality-control measures used in this study to ensure analytical accuracy included replicate sampling, replicate analysis of split samples, ambient blanks, equipment blanks, and analysis of standard reference water samples.
INTRODUCTION
The City of Las Cruces, New Mexico, is concerned with the quality of water in a reach of the Rio Grande extending from Picacho Bridge near Las Cruces, New Mexico, downstream to Calle del Norte Bridge near Mesilla, New Mexico (fig. 1). This reach of the Rio Grande receives outfall from the City of Las Cruces wastewater-treatment plant. Constituents of particular concern in this reach of the Rio Grande include dissolved and total trace metals.
Purpose and Scope
This report presents field measurements and results of laboratory analyses of water-quality samples collected from the Rio Grande and from the City of Las Cruces wastewater-treatment plant. Instantaneous discharge rates of the Rio Grande, as measured by the U.S. Geological Survey, and of the wastewater- treatment plant, as provided by the City of Las Cruces, are reported. The results of quality-control measures used during this study also are included.
Field measurements reported include stream discharge, specific conductance at 25 °C, dissolved oxygen, pH, and water temperature. Laboratory analyses reported include determinations of dissolved and total organic carbon, dissolved calcium, magnesium, barium, and uranium; dissolved solids; and aluminum, antimony, beryllium, cadmium, chromium, cobalt, copper, lead, manganese, mercury, molybdenum, nickel, selenium, silver, and zinc. Total hardness was calculated from dissolved calcium and magnesium concentrations. Water-quality sampling was conducted on August 6, 7, 20, and 21, 1996; October 8 and 9,1996; December 10 and 11,1996; and February 11, 12, 27, and 28, 1997.
Study Area
The study area includes the reach of the Rio Grande from Picacho Bridge downstream to Calle del Norte Bridge. This reach of the Rio Grande receives outfall from the City of Las Cruces wastewater- treatment plant. Outfall from the treatment plant was sampled at the outfall sampling site at the treatment plant. The exact locations at which samples were collected are: Picacho Bridge, 32° 18'37" N., 106°49'38" W.; City of Las Cruces wastewater- treatment plant sampling site, 32°17'39" N., 106°48'59" W.; and Calle del Norte Bridge, 32°15'51" N., 106°49'29" W. Sampling locations are shown in figure 1.
106'52' 106°45'
32° 22'
32° 15'
PICACHO BRIDGE SAMPLING SITE
CALLEDELNORTE BRIDGE SAMPLING SITE
01234 5 KILOMETERS
5 MILES
Figure 1. Sampling locations.
Previous Investigations
Nickerson (1995) and Healy (1996) presented water-quality data for the reach of the Rio Grande between Picacho Bridge and Calle del Norte Bridge. The report by Healy (1996) contains water-quality data for the outfall from the City of Las Cruces wastewater- treatment plant.
Sampling and Analysis Methods and Protocols
The equal-width increment method (Shelton, 1994) was used to collect water-quality samples from the Rio Grande. Processing of samples for inorganic analysis followed the protocol recommended by Horowitz and others (1994). Samples for dissolved and total organic carbon analysis were processed using protocols recommended by Ward and Harr (1990). Samples for which dissolved concentrations are reported were passed through a 0.45-micrometer filter before being bottled and shipped for analysis. Samples for which total concentrations are reported were not filtered before being bottled and shipped for analysis. Table 1 lists the method detection limits for, minimum reporting levels for, and references documenting laboratory analytical methods used in this study. The method detection limit represents the minimum concentration of an analyte that can be identified and reported with 99-percent confidence that the analyte concentration is greater than zero. The minimum reporting level represents the smallest measured concentration of an analyte that may be reliably reported using a given analytical method.
WATER-QUALITY DATA
Five types of water-quality samples were collected during sampling of the Rio Grande and the outfall of the City of Las Cruces wastewater-treatment plant. These five types of samples for which analyses are presented are environmental samples, replicate samples, split samples, ambient blanks, and equipment blanks. Environmental samples represent water collected at each sampling location on which field measurements and selected laboratory analyses were performed. Replicate samples represent water collected from both Rio Grande sampling locations approximately 30 to 45 minutes after environmental
samples on which selected laboratory analyses were performed. Samples collected from the wastewater- treatment plant were homogenized, split into two equal aliquots, and sent for laboratory analysis of selected constituents. Field measurements also were made at the treatment plant sampling site. One aliquot was arbitrarily designated as the environmental sample and the other was designated as the split sample. Ambient blanks represent reagent-grade purified water (organic- free water for organic carbon samples and inorganic blank water for all other samples) that was bottled, sealed, and transported to a sampling location. Once at the sampling location, the bottles were unsealed and exposed to the local environment during collection of the environmental sample. After sampling was completed, the ambient-blank bottles were resealed, preserved, and shipped to the laboratory for analysis of selected constituents. Ambient blanks were collected on a rotating basis from one of the three sampling locations on each day of water-quality sampling. Equipment blanks represent reagent-grade purified water that went through all appropriate sample- processing steps for either organic or inorganic samples and was shipped to the laboratory for analysis of selected constituents. One equipment blank was collected for each sampling day.
Tables 2, 3, and 4 list the results of water-quality analyses of environmental samples, replicate samples, and ambient blanks, respectively, collected at the Rio Grande at the Picacho Bridge sampling location. Results of water-quality analyses of environmental samples, split samples, and ambient blanks collected at the City of Las Cruces wastewater-treatment plant sampling site are listed in tables 5, 6, and 7, respectively. A part of the treatment process was inoperative during the February 11 sampling of outfall from the wastewater-treatment plant. Results of water- quality analyses of environmental samples, replicate samples, and ambient blanks collected from the Rio Grande at the Calle del Norte Bridge sampling location are listed in tables 8, 9, and 10, respectively. Table 11 reports the results of water-quality analyses of all equipment blanks.
QUALITY CONTROL
Field quality-control measures included collection of replicate samples, split samples, ambient blanks, and equipment blanks. Laboratory quality- control measures included, but were not limited to, spike recovery analyses on samples collected from the City of Las Cruces wastewater-treatment plant, recoveries calculated from analysis of standard reference water samples, laboratory blanks, and generation of quality-control charts throughout periods of sample analysis. All laboratory results tabulated in this report were reviewed and validated following the recommendations of Pritt and Raese (1995). The maintenance and calibration of laboratory instruments also followed the recommendations of Pritt and Raese.
Table 12 lists absolute and relative differences between selected constituents in environmental and replicate samples collected at the Picacho Bridge sampling location. Table 13 contains absolute and relative differences between selected constituents in environmental and split samples collected at the City of Las Cruces wastewater-treatment plant sampling site. Absolute and relative differences between selected constituents in environmental and replicate samples taken at the Calle del Norte Bridge sampling location are shown in table 14. Results shown in tables 12, 13, and 14 are limited to constituents for which the absolute difference between environmental and replicate samples or between environmental and split samples was non-zero for samples collected on at least one sampling day. The results in this report are greater than 99 percent complete, containing results for 3,947 of a possible total of 3,948 field and laboratory determinations.
A spike is a solution with a known concentration of analyte added in a known amount to a sample. The sample is analyzed before the spike is added, resulting in an unspiked concentration of the analyte in question. After the spike is added the sample is reanalyzed, resulting in a spiked concentration of the analyte in question. The spike recovery is calculated from:
the exceptions of total organic carbon and total zinc in the sample collected on December 11,1996 (values of 160 and 132 percent, respectively), and total chromium and total nickel in the sample collected on August 7, 1996 (values of 194 and 260 percent, respectively), all spike recoveries were within 100 + 20 percent of the expected value. Tables 16 and 17 summarize the results of water-quality analyses of ambient and equipment blanks collected in this study.
Analytical accuracy was monitored during the study by calculating recoveries from analysis of standard reference water samples and from analysis of laboratory blanks. The analytical result of a laboratory blank represents the analyte quantity obtained following analysis of a laboratory-generated sample that does not contain the analyte of interest. Samples were analyzed and monitored for analytical accuracy in sets. Sample set 1 represents samples collected August 6 and 7, 1996. Sample set 2 represents samples collected August 20 and 21, 1996. Sample set 3 represents samples collected October 8 and 9, 1996. Sample set 4 represents samples collected December 10 and 11, 1996. Sample set 5 represents samples collected February 11 and 12, 1997. Sample set 6 represents samples collected February 27 and 28,1997. Recoveries were calculated from:
recovery = (analyzed concentration in reference sample/expected concentration) X 100 percent. (2)
The recoveries are given in table 18. A recovery of 100 percent indicates a perfect match between the analytical value obtained for the reference sample and the expected value in the reference sample. Laboratory blanks were generated for each sample set for all analytes tabulated in this report. With the exception of dissolved solids in sample sets 4, 5, and 6, all laboratory blanks showed results less than the minimum reporting levels for all analytes. Laboratory blanks for dissolved solids in sample sets 4, 5, and 6 showed values of 4, 2, and 5 milligrams per liter, respectively.
spike recovery = [(spiked concentration - unspiked concentration)/spike] X 100 percent. (1)
Spike recoveries in samples collected at the City of Las Cruces wastewater-treatment plant are shown in table 15. A value of 100 percent indicates that all spike material added can be accounted for analytically. With
REFERENCES CITED
Brenton, R.W., and Arnet, T.L., 1993, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory Determination of dissolved organic carbon by UV-promoted persulfate oxidation and infrared spectrometry: U.S. Geological Survey Open-File Report 92-4809, 12 p.
Brown, G.E., and McLain, B.J., 1994, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory Determination of antimony by automated- hydride atomic absorption spectrophotometry: U.S. Geological Survey Open-File Report 93-644, 17 p.
Fishman, M.J., 1993, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory Determination of inorganic and organic constituents in water and fluvial sediment: U.S. Geological Survey Open-File Report 93-125, 217 p.
Fishman, M.J., and Friedman, L.C., 1989, Methods for determination of inorganic substances in water and fluvial sediments: U.S. Geological Survey Techniques of Water-Resources Investigations, book 5, chap. Al, 545 p.
Garbarino, J.R., and Taylor, H.E., 1996, Inductively coupled plasma-mass spectrometric method for the determination of dissolved trace elements in natural water: U.S. Geological Survey Open-File Report 94- 358, 49 p.
Healy, D.F., 1996, Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico, and Texas- Occurrence and distribution of selected pesticides and nutrients at selected surface-water sites in the Mesilla Valley, 1994-95: U.S. Geological Survey Water- Resources Investigations Report 96-4069, 85 p.
Horowitz, A.J., Demas, C.R., Fitzgerald, K.K., Miller, T.L., and Rickert, D.A., 1994, U.S. Geological Survey protocol for the collection and processing of surface- water samples for the subsequent determination of inorganic constituents in filtered water: U.S. Geological Survey Open-File Report 94-539, 57 p.
Jones, S.R., 1997, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory Determination of molybdenum in water samples by graphite furnace atomic absorption spectrophotometry: U.S. Geological Survey Open-File Report 97-198, 27 p.
McLain, B.J., 1993, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory Determination of chromium in water by graphite furnace atomic absorption spectrophotometry: U.S. Geological Survey Open-File Report 93-449, 16 p.
Nickerson, E.L., 1995, Selected hydrologic data for the Mesilla ground-water basin, 1987 through 1992 water years, Dona Ana County, New Mexico, and El Paso County, Texas: U.S. Geological Survey Open-File Report 95-111, 123 p.
Pritt, J.W, and Raese, J.W., 1995, Quality assurance/quality control manual, National Water Quality Laboratory: U.S. Geological Survey Open-File Report 95-443,35 p.
Shelton, L.R., 1994, Field guide to collecting and processing samples for the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 94- 455, 42 p.
Ward, J.R., and Harr, C.A., 1990, Methods for collection and processing of surface-water and bed-material samples for physical and chemical analysis: U.S. Geological Survey Open-File Report 90-140, 71 p.
Table 1. -Method detection limits for, minimum reporting levels for, and references documenting laboratory analytical methods used in this study
[mg/L, milligrams per liter; --, not determined in this study; jag/L, micrograms per liter; ND, no method detection limit has been established]
Water- Method quality detection
parameter limit
Organic 0.03 mg/L carbon
Calcium 0.007 mg/L
Magnesium 0.002 mg/L
Dissolved 5.5 mg/L solids
Aluminum 0.7 Mg/L
Antimony 0.2 Mg/L
Barium 0.1 Mg/L
Beryllium 0.4 Mg/L
Cadmium 0.1 Mg/L
Chromium 0.2 Mg/L
Cobalt 0.1 Mg/L
Dissolved
Minimum reporting
level
0.1 mg/L
0.02 mg/L
0.01 mg/L
1.0 mg/L
1 .0 Mg/L
1.0 Mg/L
1.0 Mg/L
1.0 Mg/L
1 .0 Mg/L
1.0 Mg/L
1 .0 Mg/L
Source for method Method
documen- detection tation limit
Brenton and 0. 1 1 mg/L Arnet, 1993
Fishman, 1993
Fishman, 1993
Fishman and Friedman,1989
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Garbarino and Taylor, 1996
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Total
Source for Minimum method reporting documen-
level tation
0.1 mg/L Fishman and Friedman,1989
~
~
-
10.0 Mg/L Fishman, 1993
1 .0 Mg/L Brown and McLain, 1994
10.0 Mg/L Fishman and Friedman, 1989
1.0 Mg/L Fishman, 1993
1 .0 Mg/L McLain, 1993
1.0 Mg/L Fishman, 1993
Table 1. Method detection limits for, minimum reporting levels for, and references documenting laboratory analytical methods used in this study Concluded
Water- Method quality detection
parameter limit
Copper 0.5 )ug/L
Lead 0.1 jug/L
Manganese 0.2 jug/L
Mercury ND
Molybdenum 0.4 ug/L
Nickel 0.6 ug/L
Selenium ND
Silver 0.3 ug/L
Uranium 0.1 ug/L
Zinc 0.8 ug/L
Dissolved
Minimum reporting
level
1.0 ug/L
1.0 ug/L
1.0 ug/L
0.1 ug/L
1.0 ug/L
1.0 ug/L
1.0 ug/L
1.0 ug/L
1.0 ug/L
1.0 ug/L
Source for method Method
documen- detection tation limit
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Fishman and ND Friedman, 1989
Garbarino ND and Taylor, 1996
Garbarino ND and Taylor, 1996
Fishman and ND Friedman, 1989
Garbarino ND and Taylor, 1996
Garbarino and Taylor, 1996
Garbarino ND and Taylor, 1996
Total
Minimum reporting
level
1.0 ug/L
l.O^g/L
10.0 ug/L
0.1 ug/L
1.0 ug/L
1.0 ug/L
1.0 ug/L
1.0 ug/L
10.0 ug/L
Source for method
documen tation
Fishman, 1993
Fishman, 1993
Fishman and Friedman, 1989
Fishman and Friedman, 1989
Jones, 1997
Fishman, 1993
Fishman and Friedman, 1989
Fishman, 1993
~
Fishman and Friedman, 1989
Tabl
e 2.
--A
naly
tical
res
ults
on
envi
ronm
enta
l sa
mpl
es c
olle
cted
fro
m th
e R
io G
rand
e at
Pi
cach
o B
ridg
e ne
ar L
as C
ruce
s, N
ew M
exic
o
[inst
., in
stan
tane
ous;
jiS
/cm
, mic
rosi
emen
s pe
r ce
ntim
eter
at 2
5 de
gree
s C
elsi
us (
deg
C);
mg/
L, m
illig
ram
s pe
r lit
er;
(ig/L
, mic
rogr
ams
per
liter
; unf
ltrd,
unf
ilter
ed;
<, l
ess
than
]
Date
Aug 1996
06.
..07 ...
20.
. .
21.
..Oct 08
. ..
09.
..De
c 10.
. .11.
..Feb 1997
11.
..12.
. .
27.
..28.
. .
Time
1250
1130
0845
1300
1225
1115
1210
1145
1230
1145
1315
1130
Dis
charge,
inst.
(cubic
feet
per
second)
1,180
1,060
1, 140
1, 140
186
210 52 50 45 45
596
580
Spe
cific
con
duct
ance
(|iS
/cm)
623
620
595
603
1,160
1,300
1,640
1,630
1,650
1,650
851
845
Oxygen ,
dis
solved
(mg/
L)
7.3
7.4
6.6
6.9
8.4
7.8
9.1
9.4
10.0
10.0
9.6
10.0
pH
water
whole,
field
(stand
ard
units)
8, 8, 8, 8, 8, 8, 8 8. 8 8 8 8
.2 .2 .0 .3 .4 .4 .3 .5 .7 .4 .5 .5
Temper
ature
water
(deg
31.
24.
24.
25.
19.
21.
13.
12.
11.
11. 9. 8.
C)
5 0 0 5 5 5 0 5 5 0 5 5
Carbon,
organic,
dis
solved
(mg/L
as C)
3.4
3.3
3.3
3.3
3.3
3.1
3.1
3.2
3.4
2.7
3.6
3.7
Carbon,
organic,
total
(mg/L
as
5, 6, 6, 6 4 3 2 2 3 3 5 5
C) .1 .9 .4 .1 .3 .7 .9 .9 .9 .9 .1 .9
Calcium,
dis
solved
(mg/L
as Ca)
42 41 35 39 83100
110
110
120
110 58 56
Magne
sium,
dis -
solved
(mg/L
as Mg)
11 119.5
10 18 20 24 23 24 24 14 13
Hard
ness,
total
(mg/L
as
CaCO
3)
150
150
130
140
280
330
370
370
400
370
200
190
Solids,
residue
at 105
deg C,
total
(mg/L)
542
582
754
488
824
918
1,080
1, 070
1,100
1,110
618
620
Tab
le 2
.--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at
Pica
cho
Bri
dge
near
Las
Cru
ces,
New
Mex
ico
Con
tinu
ed
Date
Aug
1996
06...
07.
..20.
. .
21.
. .
Oct 08
.. .
09..
.Dec 10
. ..
11.
. .
Feb 1997
11.
. .
12.
..27.
..28.
..
Alu
minu
m,di
ssolved
(ng/L
as Al
)
19 20 10 6.0
5.0
5.0
5.0
5.0
4.0
5.0
4.0
4.0
Alu
minu
m,total
recov
-er
able
(ng/
Las Al)
1,500
1,80
02,
600
1,700
1,400
970 70 50 80 80
1,10
01,
100
Anti
mony
, Anti-
dis-
mony,
solved
total
(Hg/L
(ng/L
as Sb)
as Sb)
1.0
1<1
. 0
1<1
.0
<1<1 . 0
1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1 . 0
1<1
.0
<1<1. 0
1<1. 0
1
Beryl
- Beryl-
lium,
Cadmium
Chro-
Bari
um,
dis
solved
(ng/
Las Ba)
72 70 62 68
138
164
113
112
124
121 65 64
lium,
tota
l Ca
dmiu
m,
water
mium
.dis-
recov-
dis-
un
fltr
d,
dis
solved
erable
solved
tota
l solved
(ng/L
(ng/L
(ng/
L (ng/L
(^g,
as Be)
as Be
) as Cd)
as Cd)
as
<1 . 0
<10
<1 . 0
<1
1<1
.0
<10
<1.0
<1
2
<1.0
<10
<1.0
<1
<1<1.0
<10
<1.0
<1
2
<1.0
<10
<1.0
<1
2<1
. 0
<10
<1 . 0
<1
3
<1.0
<10
<1 . 0
<1
2<1
.0
<10
<1.0
<1
2
<1.0
<10
<1.0
<1
2
<1.0
<10
<1.0
<1
2<1
. 0
<10
<1 . 0
<1
1<1 . 0
<10
<1 . 0
<1
1/ L
Cr)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Chro
mium,
total
reco
verable
(ng/L
as Cr)
<11 2 1
<1 <1
1<1 <1 <1 <1 <1
Tabl
e 2.
Ana
lyti
cal r
esul
ts o
n en
viro
nmen
tal
sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at
Pica
cho
Bri
dge
near
Las
Cru
ces,
New
Mex
ico
Con
tinu
ed
Date
Aug 1996
06.
..07.
..20.
. .
21.
..Oc
t 08.
. .
09.
..De
c 10.
. .
11.
..Fe
b 19
9711.
. .
12.
..27.
..28.
. .
Coba
lt,
dis
solved
(ng/
Las
Co
)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Cobalt,
total
Copp
er,
reco
v-
dis-
erable
solved
(ng/L
(ng/
Las Co
) as
Cu
)
<1
4.0
<1
3.0
2 1.
0<1
1.0
1 5.0
<1
2.0
<1
4.0
<1
4.0
<1
3.0
<1
4.0
<1
<1.0
1 2.
0
Copper,
total
recov -
erable
(ng/L
as Cu)
2 3 3 2 3 2
<1 <1 <1 <12 2
Lead
, dis
- solved
(H9/L
as Pb
)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Lead,
Manga-
total
nese
, re
cov-
di
s-
erable
solved
((.i
g/L
(ng
as Pb)
as
1 1,
1 <1.
3 <1
1 1
<1
2<1
2
<1
34<1
32
<1
21<1
19
1 2
2 2
Manga
nese
, total
recov
erable
Mercury,
Mercury,
tota
l dis-
recov -
solved
erable
I/L
(ng/
L (ng/L
(ng/
LMn)
.0 .0 .0 .0 .0 .0 .0 .0
as Mn
)
200
200
180
160 50 40 50 40 40 40
160
160
as Hg
) as
<0 . 1
<0 .
<0.1
<0.
<0 .
1 <0
,<0
.1
<0.
<0.
1 <0
<0 . 1
<0 ,
<0 . 1
<0<0
. 1
<0
<0.
1 <0
<0.1
<0<0.1
<0<0
. 1
<0
Hg)
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
Tabl
e 2.
--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at
Pica
cho
Bri
dge
near
Las
Cru
ces,
New
Mex
ico
Con
clud
ed
Molyb
denu
m,
dis
solved
/ . ._ /T
Date
Aug 1996
06..
.07
. ..
20.
. .
21.
. .
Oct 08
. ..
09.
..Dec 10
. .
.11.
. .
Feb
1997
11.
. .
12.
. .
27.
..28
. .
.
VUg/u
as Mo
)
6. 6. 5. 6. 7. 8. 8. 8. 8 7. 6 6
,0 .0 ,0 ,0 .0 .0 .0 .0 .0 .0 .0 .0
Molyb
denum,
total
recov -
erable
as Mo
)
4 4 5 5 7 6 7 7 7 6 6 5
Nickel,
dis
solved
(mr
/T as 3. 1. 2. 2, 2. 3, 2, 2 2 1<1 <1
if ij
Ni)
,0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Nick
el,
tota
l recov -
erable
as Ni
)
3 2 3 2 2 2 2 1
<1 <12 2
Sele-
Silver,
Uranium
nium,
Sele
- Si
lver
, total
natural,
dis-
nium,
dis-
recov-
dis
solved
total
solved
erable
solved
as Se
) as Se
) as Ag
) as Ag
) as
<1
<1
<1 . 0
<1
2<1
<1
<1
. 0
<1
2<1
<1
<1 . 0
<1
2<1
<1
<1
.0
<1
2
<1
<1
<1 . 0
<1
3<1
<1
<1
. 0
<1
4
<1
<1
<1 . 0
<1
4<1
<1
<1
. 0
<1
4
<1
<1
<1 . 0
<1
4<1
<1
<1
. 0
<1
4<1
<1
<1
. 0
<1
3<1
<1
<1
. 0
<1
3
/ Jj
U) .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Zinc,
dis
solved
(Mg/
T as
4 2 2 2 4 2 6 5
146 4 3' U Zn)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Zinc
, total
recov
erable
as Zn)
10<1
0<10
<10
<10
<10
<10
<10 10
<10
<10
<10
Tab
le 3
.--A
naly
tical
res
ults
on
repl
icat
e sa
mpl
es c
olle
cted
fro
m th
e R
io G
rand
e at
Pic
acho
Bri
dge
near
Las
Cru
ces,
New
Mex
ico
[mg/
L, m
illi
gram
s pe
r lit
er;
deg
C, d
egre
es C
elsi
us;
ng/L
, mic
rogr
ams
per
liter
; <,
less
tha
n; u
nflt
rd, u
nfil
tere
d]
Date
Aug 1996
06.
. .
20.
. .
Oct 08
. .
.De
c 10.
. .
Feb
1997
12.
. .
28.
. .
Date
Aug 1996
06.
..20
. .
.Oct 08
. ..
Dec 10
.. .
Feb 1997
12.
..28
. .
.
Time
1330
0920
1300
1255
1220
1215
Anti
mony
, total
(ng/L
as Sb)
2 <1 <1 <1 <12
Carbon,
organi
c,dis
solved
(mg/L
as C)
3.3
3.3
3.3
3.1
2.6
3.9
Bari
um,
dis
solved
(ng/L
as Ba
)
73 66 138
117
128 68
Carbon ,
organic,
total
(mg/L
as C)
5.9
5.8
4.6
3.3
5.0
6.6
Beryl
lium,
dis
solved
(ng/L
as Be)
<1 . 0
<1.0
<1.0
<1.0
<1. 0
<1.0
Calcium,
dis
solved
(mg/L
as Ca
)
42 36 83 110
120 58
Beryl -
lium,
tota
l re
cov
erable
(ng/L
as Be)
<10
<10
<10
<10
<10
<10
Magne-
Hard
-sium,
ness,
dis-
tota
lsolved
(mg/L
(mg/L
asas Mg)
CaC0
3)
11
150
9.8
130
18
280
24
370
25
400
14
200
Cadmium
Cadmium,
water
dis-
unfltrd,
solved
tota
l ((ig/L
(fig/L
as Cd)
as Cd)
<1.0
<1<1
.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
Soli
ds,
residue
at 10
5deg
C,to
tal
(mg/
L)
512
786
846
1,080
1,11
0618
Chro
mi
um,
dis
solved
(jig/L
as Cr
)
<1 .
0<1
.0 2.0
<2.0
2.0
1.0
Alu
minum,
dis
solved
(ng/L
as Al
)
208.0
6.0
5.0
4.0
4.0
Chro
mi
um,
tota
l recov
erable
(jig/L
as Cr)
1 1 1
<1 <11
Alu
minum,
total
recov
erable
(jig
/Las
Al)
1,70
02,
000
1,500 60 80
1,20
0
Coba
lt,
dis
solved
(ng/
Las
Co)
<1 .
0<1.
0
<1.0
<1.0
<1 .0
<1.0
Anti
mo
ny,
dis
solved
(H"3
/Las
Sb
)
<1 .
01.0
<1 .0
<1 .
0
<1 .0
Cobalt,
total
reco
v
erable
(ng/L
as Co)
1<1
1
<1 <11
Tab
le 3
. Ana
lyti
cal
resu
lts
on r
eplic
ate
sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at P
icac
ho B
ridg
e ne
arL
as C
ruce
s, N
ew M
exic
o C
oncl
uded
Manga -
Copp
er,
Lead,
Manga-
nese
, Mercury,
Copper,
tota
l Lead,
tota
l ne
se,
total
Mercury,
total
dis-
recov-
dis-
re
cov-
dis-
recov-
dis-
recov-
solved
erable
solved
erable
solved
erable
solved
erable
(|ig/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
Date
as Cu)
as Cu
) as Pb
) as
Pb)
as Mn
) as
Mn
) as Hg
) as
Hg)
Aug 06 20
Oct 08
Dec 10
Feb 12 28
1996
4.0
4 <1
.0
2 <1.0
200
<0.1
<0.10
1.0
2 <1
.0
2 1.0
160
<0.1
<0.10
6.0
2 <1
.0
<1
2.0
50
<0.1
<0.10
2.0
<1
<1.0
<1
35
50
<0.1
<0.10
1997
1.0
<1
<1.0
<1
20
40
<0
.1
<0.10
<1.0
2 <1
.0
2 2.0
170
<0.1
<0.10
Molyb-
Molyb-
denu
m,de
num,
to
tal
dis-
recov -
solved
erable
(|jg/L
(ng/
Las
Mo
) as
Mo
)
6.0
56.
0 5
6.0
6
8.0
7
8.0
76.0
5
Nick
el,
Sele-
Silver,
Uranium
Zinc
, Nickel,
tota
l ni
um,
Sele
- Silver,
total
natural,
Zinc,
total
dis-
recov-
dis-
nium,
dis-
recov-
dis-
di
s-
reco
v-
solved
erable
solved
tota
l solved
erable
solved
solved
erable
(|jg/L
(|ig/L
(|ag/L
(ng/
L (ng/L
(ng/
L (ng/L
(ng/L
(ng/
L Date
as Ni
) as Ni
) as Se)
as Se
) as Ag
) as Ag
) as U)
as Zn
) as
Zn)
Aug 1996
06...
2.0
7 <1
<1
<1.0
<1
2.0
4.20...
2.0
2 <1
<1
<1
.0
<1
2.0
7.Oc
t 08...
2.0
2 <1
<1
<1.0
<1
3.0
4.De
c 10...
2.0
1 <1
<1
<1.0
<1
4.0
9.Fe
b 1997
12...
2.0
1 <1
<1
<1
.0
<1
4.0
2.28
...
<1.0
2 <1
<1
<1.0
<1
3.0
<1.
0 20
0 <1
0
0 <1
0
0 <10
0 <10
0 <10
Tabl
e 4.
--A
naly
tical
res
ults
on
ambi
ent b
lank
s co
llect
ed f
rom
the
Rio
Gra
nde
at P
icac
ho B
ridg
ene
ar L
as C
ruce
s, N
ew M
exic
o
[rng
/L, m
illi
gram
s pe
r lit
er;
|ig/L
, mic
rogr
ams
per
liter
; <,
less
than
; unf
ltrd
, unf
ilter
ed]
Date
Time
Carb
on,
Magne-
Alu-
organic.
Ca
rbon
, Calcium,
slum,
minum,
dis-
orga
nic,
di
s-
dis-
dis-
solved
tota
l solved
solved
solved
(mg/
L (m
g/L
(mg/L
(mg/L
(ng/
Las C)
as C)
as
Ca)
as Mg
) as Al
)
Alu-
minum,
tota
l recov-
erable
(ng/L
as Al
)
Anti
-
mony
, dis-
solved
(ng/L
as Sb
)
Anti
-
mony
, total
(ng/
L as Sb
)
Barium,
dis
solved
(ng/
L as Ba
)
Aug 1996
20.
. .
Oct 09
. ..
Fe
b 1997
11...
28.
..
0847
1116
1231
1132
<0.10
<0.10
<0.10
<0.10
<0.10
0.10
0.20
0.20
<0.02
<0.02
<0.02
<0.02
<0.01
<0.01
<0.01
<0.01
<1.0
3.0
3.0
3.0
<10
10
<10
<10
<1.0
<1.0
<1.0
<1.0
<1
<1 <1
<1
<1.0
<1.0
<1.0
<1.0
Date
Beryl -
lium,
dis
solved
(ng/L
as Be)
Beryl -
lium,
tota
lrecov
erable
(ng/L
as Be)
Cadm
ium,
dis
solved
(ng/L
as Cd
)
Cadmium
water
unfltrd.
tota
l(n
g/L
as Cd)
Chro
mium
,di
s
solved
(ng/L
as Cr)
Chro
mi
um,
total
recov -
erable
(ng/L
as Cr)
Coba
lt,
dis
solved
(ng/L
as Co
)
Cobalt,
tota
lrecov -
erable
(ng/L
as Co)
Copper ,
dis
solved
(ng/
Las
Cu)
Aug 1996
20.
. .
Oct 09
. ..
Feb
1997
11.
. .
28..
.
Tabl
e 4.
--A
naly
tical
res
ults
on
ambi
ent b
lank
s co
llect
ed f
rom
the
Rio
Gra
nde
at P
icac
ho B
ridg
ene
ar L
as C
ruce
s, N
ew M
exic
o C
oncl
uded
Date
Aug 1996
20.
. .
Oct 09
. ..
Feb 1997
11.
..28
. ..
Copper ,
tota
l Le
ad,
reco
v-
dis-
erable
solved
<Hg/L
(ng/
Las Cu
) as
Pb)
<1
<1.0
<1
<1.0
<1
<1 .
0<1
<1.0
Lead,
tota
lrecov
erable
(ng/L
as Pb)
<1 <1 <1 <1
Manga -
nese,
dis
solved
(ng/
Las Mn
)
<1.0
<1.0
<1 . 0
<1.0
Manga -
nese,
Mercury,
tota
l Mercury,
total
recov-
dis-
recov
erable
solved
erable
(|ig/L
(|ig/L
(ng/L
as Mn
) as Hg)
as Hg
)
<10
<0 .
1 <0
. 10
<10
<0 .
1 <0
. 10
<10
<0 .
1 <0
. 10
<10
<0 .
1 <0 . 10
Molyb
denum,
dis
solved
(ng/L
as Mo
)
<1.0
<1.0
<1 . 0
<1.0
Molyb
denu
m,total
recov
erable
(|ig
/Las Mo)
<1 <1 <1 <1
Date
Aug 1996
20.
. .
Oct 09
. .
.Feb 1997
11.
. .
28.
..
Nickel,
Sele
- Silver,
Uranium
Nickel,
tota
l nium,
Sele
- Si
lver
, total
natural.
Zinc,
dis-
recov-
dis-
nium,
dis-
recov-
dis-
dis
solved
erable
solved
tota
l solved
erable
solved
solved
(ng/
L (n
g/L
(ng/
L (ng/L
(ng/L
(ng/L
(ng/L
(ng/
L as Ni
) as
Ni
) as Se)
as Se
) as Ag
) as Ag
) as U)
as Zn
)
<1.0
<1
<1
<1
<1.0
<1
<1.0
<1.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
1.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
3.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
4.0
Zinc,
total
reco
verable
as Zn
)
<10
<10
<10
<10
Tabl
e 5.
--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed a
t the
City
of L
as C
ruce
sw
aste
wat
er-t
reat
men
t pla
nt
[ins
t., in
stan
tane
ous;
juS/
cm, m
icro
siem
ens
per c
entim
eter
at 2
5 de
gree
s C
elsi
us (
deg
C);
mg/
L, m
illig
ram
s pe
r lit
er; j
ug/L
, mic
rogr
ams
per l
iter;
<, l
ess
than
; unf
ltrd,
unf
ilter
ed;
, no
dat
a]
Date
Time
Aug 1996
06...
0950
07..
. 0950
20..
. 1100
21..
. 1130
Oct 08
...
0935
09...
0945
Dec 10
...
1030
11..
. 10
30Feb
1997
11..
. 11
0012
...
1015
27..
. 1130
28..
. 0945
Dis
char
ge,
inst.
(cub
icfeet
per
second)
15 15 16 17 18 17 16 16 14 14 15 14
Spe
cific
con
duct
ance
(US/cm)
1,260
1,26
01,220
1,21
0
1,230
1,240
1,270
1,290
1,410
1,430
1,410
1,410
Oxygen,
dis
solved
(mg/L)
6.7
6.4
6.4
6.3
5.7
6.2
6.8
6.9
6.7
7.1
6.7
7.2
ph
water
whole,
fiel
d( s tand
-ard
unit
s)
7.5
7.4
7.3
7.3
7.3
7.5
7.3
7.3
7.8
7.5
7.3
7.5
Temper -
ature
water
(deg
C)
29.0
28.0
32.0
28.0
25.5
26.0
21.0
21.0
18.0
19.0
18.0
10.5
Carb
on ,
orga
nic,
dis
solved
(mg/
Las C)
5.1
5.0
5.5
5.0
6.5
6.3
10 7.8
13 7.1
7.6
7.6
Carb
on,
organic.
total
(mg/
Las C)
7.6
5.8
8.9
6.6
8.0
7.4
9.6
39 18 10 8.6
9.9
Calc
ium,
dis
solved
(mg/
Las Ca)
72 72 70 71 71 73 81 78 95 93 95 93
Magne
sium
,di
sso
lved
(mg/
Las Mg)
18 18 18 18 18 17 18 17 21 21 21 21
Hard
ness
,total
(mg/L
asCaCO
3)
250
250
250
250
250
250
280
260
320
320
320
320
Tab
le 5
. Ana
lyti
cal r
esul
ts o
n en
viro
nmen
tal s
ampl
es c
olle
cted
at t
he C
ity
of L
as C
ruce
sw
aste
wat
er-t
reat
men
t pla
nt C
onti
nued
Date
Aug 1996
06.
..07.
..20
. .
.21.
. .
Oct 08
. ..
09.
..Dec 10
. ..
11.
. .
Feb 1997
11.
. .
12.
..27
. .
.28.
. .
Solids,
residue
at 10
5deg C,
total
(mg/
L)
812
798
786
780
786
784
836
902
920
900
904
Alu
minu
m,dis
solv
ed(jig/L
as Al
)
17 15 13 13 14 11 11 12 9.0
9.0
8.0
8.0
Alu
minum,
tota
lrecov
erable
(jig/L
as Al
)
30 30 40 40 20 30 60720 50 50 50 50
Anti
-mo
ny,
Anti
-dis-
mony
,solved
tota
l((ig/L
(jig/L
as Sb)
as Sb)
<1. 0
<1<1.0
<1<1.0
<1<1.0
<1
<1.0
<1<1.0
<1
1.0
<11.0
1
1.0
<11.
0 <1
1.0
<11.0
1
Bari
um,
dis-
dolved
(ng/
Las Ba)
8.0
8.0
9.0
8.0
7.0
7.0
16 17 19 20 15 15
Beryl
- Beryl-
lium,
Cadmium
Chro
-lium,
total
Cadmium,
water
mium
,di
s-
reco
v-
dis-
unfltrd,
dis
solved
erable
solv
ed
total
solved
(ng/L
(ng/L
(jig/L
(jig/L
(ng/L
as Be)
as Be)
as Cd)
as Cd
) as Cr
)
<1 . 0
<10
<1. 0
<1
1.0
<1.0
<10
<1.0
<1
2.0
<1 .
0 <10
<1. 0
<1
1.0
<1.0
<10
<1.0
<1
2.0
<1 .0
<10
<1.0
<1
2.0
<1 .0
<10
<1 .0
<1
2.0
<1.0
<10
<1.0
<1
<1.0
<1.0
<10
<1 . 0
<1
1.0
<1.0
<10
<1.0
<1
1.0
<1 . 0
<10
<1. 0
<1
2.0
<1 . 0
<10
<1 . 0
<1
2.0
<1. 0
<10
<1 . 0
<1
2.0
Tabl
e 5.
Ana
lyti
cal r
esul
ts o
n en
viro
nmen
tal s
ampl
es c
olle
cted
at t
he C
ity o
f Las
Cru
ces
was
tew
ater
-tre
atm
ent p
lant
Con
tinu
ed
Chro
mium
, Cobalt,
total
Coba
lt,
total
Copp
er,
recov-
dis-
reco
v-
dis-
erab
le
solv
ed
erable
solv
ed
Copp
er,
total
reco
v
erable
(ng/
L (|ig/L
(ng/L
(|ig/L
(ng/L
Date
Aug
1996
06..
.07.
..20.
..21
...
Oct 08
. ..
09..
.Dec 10
. .
.11
. . .
Feb
1997
11..
.12
...
27.. .
28...
as Cr)
<1 <1 <1 <1 <1 <1 <13 <1 <1 <1 <1
as Co)
as Co)
as
<1 . 0
<1
3<1
. 0
<1
2<1.0
<1
2<1
. 0
<1
2
<1.0
<1
<1
<1.0
<1
<1
<1 . 0
<1
2<1 . 0
<1
8
<1 . 0
<1
2<1
. 0
<1
1<1
. 0
<1
1<1
. 0
<1
3
Cu)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
as Cu
)
1 1 2 2 <1 <1
3 56
3 2 5 3
Lead,
Manga
- Le
ad,
total
nese
, dis-
reco
v-
dis
solv
ed
erab
le
solved
(ng/L
(^ig
/L
(ng/
Las Pb)
as Pb)
as Mn
)
<1.0
<1
32<1.0
<1
30<1.0
<1
39<1.0
<1
35
<1.0
<1
55<1.0
<1
51
<1.0
<1
31<1
.0
8 37
<1.0
<1
47<1
.0
<1
51<1.0
1 45
<1.0
<1
79
Manga -
nese,
total
recov
- er
able
(|ig/L
as Mn)
50 40 50 40 60 60 40 70 60 60 50 80
Merc
ury,
Me
rcur
y,
total
dis-
te
cov-
solved
erab
le(|
ig/L
(jig
as Hg)
as
<0.1
<0<0.1
<0<0.1
<0<0.1
<0
<0.1
<0<0.1
<0
<0.1
<0<0 . 1
<0
<0.1
<0<0.1
<0<0.1
<0<0.1
<0
r/L Hg)
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
Tabl
e 5.
-Ana
lytic
al re
sults
on
envi
ronm
enta
l sam
ples
col
lect
ed a
t the
City
of L
as C
ruce
sw
aste
wat
er-t
reat
men
t pla
nt C
oncl
uded
Date
Aug 1996
06..
.07...
20.
. .
21.
. .
Oct 08
.. .
09..
.Dec 10
.. .
11.
. .
Feb
1997
11.
. .
12.
..27
. .
.28.
. .
Molyb
denu
m,
dis
solved
(Hg/L
as Mo
)
27 28 31 31 20 20 22 18 28 42 30 31
Moly
b
denu
m ,
tota
l recov
erab
le(ug/L
as Mo
)
23 23 27 27 18 16 19 16 27 40 27 27
Nick
el,
dis
solved
(UQ
as
3. 3. 4. 4, 3 3 2 2 2 3 2 2
r/L
Ni)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Nick
el,
Sele
- to
tal
nium
, Se
le-
Silv
er,
reco
v-
dis-
nium
, dis-
erable
solved
total
solved
(ug/L
(ug/L
(ug/L
(ug/L
as Ni)
as Se
) as Se)
as Ag
)
2 <1
<1
<1
.01
<1
<1
<1.0
2 <1
<1
<1
.01
<1
<1
<1.0
2 <1
<1
<1 . 0
2 <1
<1
<1
. 0
211
<1.0
3 1
1 <1.0
211
<1.0
2 1
1 <1.0
211
<1.0
211
<1.0
Silv
er,
Uran
ium
total
natural,
recov-
dis-
erable
solved
(ug/L
(ug/L
as Ag
) as U)
<1
10<1
10<1
11
<1
10
<1
9.0
<1
8.0
<1
7.0
3 7.0
<1
11<1
13
<1
11<1
12
Zinc
, dis
solved
(ug/
Las Zn
)
18 16 16 14 15 11 25 46 31 40 24 24
Zinc
, to
tal
recov -
erable
(Hg/
Las Zn
)
30 20<1
0 10 20 10 3010
0 30 30 30 20
Tab
le 6
. Ana
lyti
cal r
esul
ts o
n sp
lit s
ampl
es c
olle
cted
at t
he C
ity o
f L
as C
ruce
sw
aste
wat
er-t
reat
men
t pla
nt
[mg/
L, m
illi
gram
s pe
r lit
er;
(ig/
L, m
icro
gram
s pe
r lit
er;
<, l
ess
than
; unf
ltrd
, unf
ilte
red]
Carbon ,
organic,
dis
solved
(mg/L
Date
Aug 1996
06.
..07.
..20.
. .
21.
. .
Oct 08
. .
.09.
..Dec 10
. .
.11.
. .
Feb 1997
11.
. .
12.
. .
27.
..28
. .
.
Time
0950
0950
1100
1130
0935
0945
1030
1030
1100
1015
1130
0945
as
5. 5, 5 5, 6 6
107 137 7 7
C) .1 .0 .5 .0 .5 .3 .8 .1 .6 .6
Carbon,
organic,
total
(mg/L
as 7, 5. 8, 6, 8, 7 939 18 108 9
C) ,6 .8 .9 .6 .0 .4 .6 .6 .9
Alu
minum,
dis
solved
(ng/
Las Al)
17 15 13 13 14 11 11 12
9.0
9.0
8.0
8.0
Alu
minum,
total
recov -
erable
(ng/
Las Al
)
30 30 40 40 20 30 60720 50 50 50 50
Anti
mony,
dis
solved
(ng/
Las Sb
)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.0
1.0
1.0
1.0
1.0
1.0
Anti-
Barium,
mony,
dis-
total
solved
(ng/L
(ng/L
as Sb
) as
<1
8.<1
8.<1
9.<1
8,
<1
7.<1
7.
<1
161
17
<1
19<1
20<1
151
15
Ba)
.0 .0 .0 .0 .0 .0
Beryl
lium,
dis
solved
(ng/
Las Be)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Beryl -
lium,
Cadmium
total
Cadmium,
water
recov-
dis-
unfltrd,
erable
solved
total
(ng/L
(ng/L
(ng/L
as Be)
as Cd
) as Cd
)
<10
<1 . 0
<1<10
<1 . 0
<1<10
<1 . 0
<1<10
<1 . 0
<1
<10
<1 . 0
<1<10
<1 . 0
<1
<10
<1 . 0
<1<10
<1 . 0
<1
<10
<1 . 0
<1<10
<1 . 0
<1<10
<1 . 0
<1<10
<1 . 0
<1
Tabl
e 6.
~Ana
lytic
al r
esul
ts o
n sp
lit s
ampl
es c
olle
cted
at t
he C
ity o
f Las
Cru
ces
was
tew
ater
-tre
atm
ent p
lant
Con
tinu
ed
Chro-
Chro-
mium,
mium,
total
Cobalt,
dis-
recov-
dis
solved
erable
solved
(|ag/L
(ng/L
(|ag/L
Date
as Cr
) as Cr)
as Co)
Aug 1996
06.
. .
07.
. .
20.
. .
21.
. .
Oct 08
. .
.09
. ..
Dec 10
. .
.11.
. .
Feb 1997
11.
. .
12.
. .
27.
. .
28.
. .
1. 2. 1. 2, 2, 2, 1 1. 1 2 2 2
. 0
<1
<1.0
.0
<1
<1.0
. 0
<1
<1.0
. 0
<1
<1 . 0
. 0
<1
<1.0
. 0
<1
<1.0
. 0
<1
<1 . 0
.0
3 <1.0
. 0
<1
<1 . 0
. 0
<1
<1.0
. 0
<1
<1.0
. 0
<1
<1 . 0
Cobalt,
Copper,
total
Copper,
total
recov-
dis-
recov
erable
solved
erable
((ag/L
(ng/L
<ng/L
as Co)
as Cu)
as Cu)
<1
3.<1
2.<1
2 .
<1
2.
<1
<1 .
<1
<1.
<1
2.<1
8.
<1
2,<1
1,<1
1,<1
3
0 0 ,0 ,0 ,0 .0 .0 .0 .0 .0 .0 .0
1 1 2 2
<1 <1
356
3 2 5 3
Lead,
dis
solved
(Hg/L
as Pb)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Lead,
Manga -
total
nese,
recov-
dis-
erable
solved
<Hg/L
(|ag
/L
as Pb
) as Mn)
<1
32<1
30<1
39
<1
35
<1
55<1
51
<1
318
37
<1
47<1
51
1 45
<1
78
Manga
- ne
se,
tota
l recov
erable
(ng/
Las Mn)
50 40 50 40 50 50 40 70 60 40 50 80
Mercury,
dis
solved
(Hg/L
as Hg)
<0 .
<0.
<0.
<0.
<0.
<0,
<0,
<0,
<0 <0 <0 <0
,1 .1 .1 .1 .1 .1 .1 .1 .1 .1 .1 .1
Mercury,
total
recov
erable
(ng/L
as Hg)
<0 .
<0.
<0.
<0.
<0.
<0.
<0.
<0.
<0,
<0,
<0,
<0
10 10 ,10
,10
,10
.10
.10
.10
.10
.10
.10
.10
Tabl
e 6.
--A
naly
tical
res
ults
on
split
sam
ples
col
lect
ed a
t the
City
of L
as C
ruce
s w
aste
wat
er-t
reat
men
t pla
nt C
oncl
uded
Molyb
denum,
dis
solved
(ug/L
Date
as Mo
)
Aug 1996
06...
2707
...
2820
. .
. 31
21.
. .
31Oct 08
...
2009
...
20Dec 10
...
2211...
18Fe
b 1997
11..
. 28
12..
. 42
27.
. .
3028...
31
Molyb
denum,
tota
lrecov
erable
(ug/L
as Mo
)
23 23 27 27 18 16 19 16 27 40 27 27
Nickel
,dis
solved
(ug/L
as Ni
)
3.0
3.0
4.0
4.0
3.0
3.0
2.0
2.0
2.0
3.0
2.0
2.0
Nickel,
tota
lrecov -
erable
(ug/
Las Ni
)
2 1 5 1 2 2 2 3 2 2 2 2
Sele
nium,
dis
solved
(ug/
Las
Se
)
<1 <1 <1 <1 <1 <1
1 1 1 1 1 1
Sele
nium
,to
tal
(ug/
Las Se)
<1 <1 <1 <1 <1 <1
1 1 1 1 1 1
Silv
er,
Uranium
Silv
er,
tota
l natural.
dis-
recov-
dis
solved
erable
solved
(ug/L
(ug/L
(ug/L
as Ag)
as Ag
) as U)
<1.0
<1
10
<1.0
<1
10<1
.0
<1
11<1
.0
<1
10
<1.0
<1
9.0
<1.0
<1
8.
0
<1.0
<1
7.
0<1.0
3 7.0
<1.0
<1
11
<1.0
<1
13<1
.0
<1
11<1
.0
<1
12
Zinc
,dis
-solved
(ug/
Las
Zn)
18 16 16 14 15 11 25 46 31 40 24 24
Zinc
,total
recov
erable
(ug/
Las
Zn
)
20 20 10 10 20 10 3010
0 30 30 30 20
Tab
le 7
.~A
naly
tical
res
ults
on
ambi
ent b
lank
s co
llect
ed a
t the
Cit
y of
Las
Cru
ces
was
tew
ater
-tre
atm
ent p
lant
[mg/
L, m
illi
gram
s pe
r lit
er;
jug/
L, m
icro
gram
s pe
r lit
er;
<, le
ss th
an; u
nflt
rd, u
nfil
tere
d]
Date
Aug 1996
06..
.21
. .
.Dec 10
.. .
Feb 1997
12.
..
Time
0953
1132
1032
1017
Carbon,
organic,
dis
solved
(mg/L
as C)
<0.10
<0.10
<0.10
<0.10
Carbon,
orga
nic,
tota
l(mg/L
as C)
<0.10
<0.10
0.30
0.40
Calcium,
dis
solved
(mg/L
as Ca
)
<0.02
<0.02
<0.02
0.02
Magne
sium,
dis
solved
(mg/L
as Mg
)
<0.01
<0.01
<0.01
<0.01
Alu
minum,
dis
solved
(ng/L
as Al
)
3.0
3.0
6.0
3.0
Alu
minum,
total
recov
erable
(ug/
Las Al
)
<10
<10
<10
<10
Anti
mony,
dis
solved
(Mg/
Las Sb
)
<1.0 1.0
<1.0
<1.0
Anti
mony,
total
(^g/L
as Sb
)
<1 <1 <1 <1
Barium,
dis
solved
(ng/
Las
Ba)
<1.0
<1.0
<1.0
<1.0
Date
Aug
1996
06...
21...
Dec 10
...
Feb
1997
12...
Bery
l -
lium,
dis
solved
(ng/L
as Be)
<1.0
<1.0
<1.0
<1.0
Bery
l -
lium.
total
reco
ver
able
(ng/L
as Be)
<10
<10
<10
<10
Cadm
ium,
dis
solv
ed(n
g/L
as Cd)
<1.0
<1.0
<1.0
<1.0
Cadmium
wate
run
fltr
d,total
(ng/
Las Cd
)
<1 <1 <1 <1
Chro
mium,
dis
solved
fug/l
as Cr
)
<1 .0
<1.0
<1.0
<1.0
Chro
mium,
total
Coba
lt,
reco
v-
dis-
erab
le
solv
ed(ng/L
(ng/L
as Cr
) as Co)
<1
<1. 0
<1
<1.0
<1
<1.0
<1
<1.0
Coba
lt,
total
Copper,
reco
v-
dis-
erable
solved
(ug/L
(ug/
Las Co
) as Cu)
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
Tab
le 7
.--A
naly
tical
res
ults
on
ambi
ent b
lank
s co
llect
ed a
t the
City
of L
as C
ruce
s w
aste
wat
er-t
reat
men
t pla
nt C
oncl
uded
Date
Aug 1996
06.
. .
21.
. .
Dec 10
. . .
Feb
1997
12.
..
Copp
er,
Lead,
Mang
a -
tota
l Lead,
total
nese
,recov-
dis-
recov-
dis-
erab
le
solv
ed
erable
solv
ed(ug/L
(ug/L
(ug/L
(ug/L
as Cu)
as Pb)
as Pb)
as Mn)
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
Mang
a -
nese,
total
Merc
ury,
recov-
dis-
erable
solved
(ug/L
(ug/L
as Mn)
as Hg)
<10
<0.1
<10
<0.1
<10
<0.1
<10
<0.1
Merc
ury,
tota
lrecov
-erable
(Ug/L
as Hg)
<0.10
<0.10
<0.10
<0.10
Molyb
denum
,di
ssolved
(ug/L
as Mo)
<1.
0<1.0
<1.0
<1 . 0
Molyb
denum
,total
reco
verable
(ug/
Las Mo)
<1 <1 <1 <1
Date
Aug
1996
06.
..21.
. .Dec 10
.. .
Feb
1997
12.
..
Nick
el,
Sele-
Silv
er,
Uranium
Nick
el,
tota
l ni
um,
Sele
- Silver,
total
natural,
Zinc,
dis-
recov-
dis-
nium
, dis-
reco
v-
dis-
dis
solv
ed
erab
le
solv
ed
tota
l solved
erable
solved
solved
(ug/L
(ug/L
(ug/L
(ug/L
(ug/L
(ug/L
(ug/L
(ug/L
as Ni)
as Ni
) as Se)
as Se)
as Ag)
as Ag)
as U)
as Zn)
<1.0
<1
<1
<1
<1.0
<1
<1.0
<1.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
2.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
<1.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
4.0
Zinc
,total
reco
ver
able
(Ug/
Las Zn)
<10
<10
<10
<10
Tab
le 8
.--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at C
alle
del
Nor
te B
ridg
ene
ar M
esill
a, N
ew M
exic
o
[|xS/
cm, m
icro
siem
ens
per
cent
imet
er a
t 25
degr
ees
Cel
sius
(de
g C
); m
g/L
, mil
ligr
ams
per
liter
;, m
icro
gram
s pe
r lit
er; <
, les
s th
an; u
nflt
rd, u
nfil
tere
d]
Date
Aug 1996
06..
.07
. ..
20..
.21.
..Oct 08
. .
.09
...
Dec 10
.. .
11...
Feb 1997
11.
. .
12.
..27
. ..
28..
.
Time
0830
0800
1330
0845
0845
0815
0845
0810
0915
0815
0930
0830
Dis
charge,
inst .
(cubic
feet
per
second)
1,120
1,290
1,680
1,630
172
154 48 48 45 43 563
530
Spe
cific
con -
Oxygen ,
duct
- di
s-ance
(US/
cm)
623
611
595
610
1,190
1,240
1,600
1,620
1,65
01,
650
853
854
solved
(mg/
L)
7.0
7.3
7.1
6.3
7.9
8.0
9.4
9.9
9.4
9.8
10.4 9.7
Ph
water
whole,
field
(stand
ard
unit
s)
8.3
8.2
8.1
8.3
8.2
8.4
8.3
8.4
8.4
8.4
8.5
8.5
Carb
on,
organic,
Temper-
dis-
ature
solved
water
(deg
C)
23.0
24.0
27.0
24.0
18.0
18.0
10.0 9.5
6.0
7.5
6.0
7.5
(mg/L
as 3. 3. 3. 3. 3. 3. 3. 3. 3. 3. 3. 3.
C) 3 3 5 3 2 2 5 5 4 4 8 6
Carbon ,
organic,
total
(mg/L
as 6. 6. 6. 6. 4. 3. 4. 3. 3. 5. 6. 6.
C) 5 3 0 2 0 9 1 7 9 1 1 7
Calcium,
dis
solved
(mg/L
as Ca)
42 40 36 38 83 93
110
100
110
110 57 58
Magne -
sium
, dis
solved
(mg/L
as Mg
)
11 109.5
10 18 20 23 22 23 24 13 14
Hard
ness,
tota
l (m
g/L
as CaCO
3)
150
140
130
140
280
310
370
340
370
370
200 20
Tab
le 8
.--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at C
alle
del
Nor
te B
ridg
ene
ar M
esill
a, N
ew M
exic
o C
onti
nued
10 o>
Date
Aug 1996
06.
. .
07.
..20
. .
.21
. .
.Oct 08
. .
.09
. ..
Dec 10
. .
.11
. .
.Feb 1997
11.
. .
12.
..27
. ..
28.
..
Soli
ds,
residue
at 105
deg C,
tota
l(mg/L)
546
628
678
692
826
884
1,06
01,
070
1,090
1,08
0614
614
Alu
minum,
dis
solved
(Me
as 25 216 5 5 5 7 6 5 4 6 4
J/L
Al)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Alu
minum,
tota
l recov
erable
<M as 1, 1, 2, 2, 1, 1, 1, 1,
g/L Al)
900
900
700
500
200
000 50 50 90
120
100
200
Anti
- Beryl -
mony
, An
ti-
Bari
um,
lium,
dis-
mony,
dis-
dis
solved
tota
l solved
solved
(ucf/L
(Mg/
L (Mg/L
(ug/L
as Sb
) as Sb
) as
Ba
) as Be
)
<1.0
1 73
<1.0
2.0
1 68
<1.0
1.0
<1
63
<1.0
<1.0
<1
66
<1.0
<1.0
<1
142
<1.0
<1.0
<1
154
<1.0
<1 . 0
<1
99
<1 . 0
<1 . 0
<1
96
<1 . 0
<1.0
<1
105
<1.0
<1.0
1 109
<1.0
<1.0
1 61
<1.0
<1 .0
2 66
<1
.0
Beryl
lium
, Cadmium
Chro
- to
tal
Cadmium,
water
mium,
recov-
dis-
unfltrd,
dis-
erable
solved
total
solved
<Hg/L
(jag/L
(|ag/L
(|ag/L
as Be
) as
Cd
) as
Cd
) as
<10
<1 . 0
<1
2 .
<10
<1 . 0
<1
2 ,
<10
<1.0
<1
<1.
<10
<1 . 0
<1
1 ,
<10
<1 .
0 <1
2
<10
<1.0
<1
3
<10
<1 . 0
<1
1<10
<1 . 0
<1
1
<10
<1 . 0
<1
2<10
<1 . 0
<1
1<1
0 <1
. 0
<1
1<10
<1 . 0
<1
1
Cr)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Tab
le 8
.--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at C
alle
del
Nor
te B
ridg
ene
ar M
esill
a, N
ew M
exic
o C
onti
nued
Chro
mium,
Cobalt,
total
Cobalt,
total
Copp
er,
reco
v-
dis-
recov-
dis-
erable
solved
erable
solved
Date
Aug 1996
06.
..07...
20...
21.
..Oct 08
...
09.
..Dec 10
. .
.11
. .
.Fe
b 1997
11.
. .
12.
..27.. .
28.
. .
(ng/
L (n
g/L
(ng/
L (M<
as Cr
) as Co
) as Co
) as
1 <1.0
<1
61
<1.0
1 3
2 <1.0
6 2
2 <1.0
1 2
<1
<1.0
1 2
<1
<1. 0
<1
1
<1
<1 . 0
<1
2<1
<1 . 0
<1
2
<1
<1 . 0
<1
4<1
<1.0
<1
<11
<1. 0
<1
<1<1
<1.0
<1
<1
J/L Cu)
.0 .0 .0 .0 .0 .0 .0 .0 .0 . 0 .0 .0
Copper ,
tota
l Lead,
recov-
dis-
erable
solved
(Mg/L
(ng/
Las Cu
) as Pb
}
3 <1
. 0
3 <1
. 0
2 <1
. 0
2 <1
. 0
5 <1
. 0
2 <1 . 0
1 <1
. 0
1 <1
. 0
<1
<1.0
<1
<1.0
2 <1
. 0
2 <1
. 0
Lead
, to
tal
recov
erable
(M9/
Las Pb
)
2 2 4 2
<1 <1 <1 <1 <1 <12 2
Manga -
nese
, dis
solved
(ng
as <1 <11
<1
1 1 11 10 10 9 2 1
7L Mn)
. 0 .0 .0 .0 .0 .0 .0 .0 .0
Manga -
nese
, total
recov
erable
(ng/
Las Mn
)
220
180
230
170 30 30 20 20 20 30
150
160
Mercury,
Mercury,
tota
l di
s-
recov -
solved
erable
(ng/
L (ng
as Hg}
as
<0.1
<0,
<0.1
<0,
<0.1
<0,
<0.
1 <0
<0.1
<0,
<0. 1
<0
<0.1
<0<0.1
<0
<0 . 1
<0<0
. 1
<0<0
. 1
<0<0
. 1
<0
/L Hg)
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
.10
Tab
le 8
.--A
naly
tical
res
ults
on
envi
ronm
enta
l sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at C
alle
del
Nor
te B
ridg
ene
ar M
esill
a, N
ew M
exic
o C
oncl
uded
Date
Aug 1996
06.
. .
07.
. .
20.
. .
21.
..Oct 08
.. .
09.
..Dec 10
. .
.11.
. .
Feb
1997
11.
. .
12.
. .
27.
..28
. .
.
Molyb
denu
m,
dis
solved
(ng/L
as Mo
)
6.0
6.0
6.0
6.0
7.0
8.0
9.0
9.0
10 126.0
7.0
Molyb
denum,
tota
l recov
erable
Nick
el,
dis
-
solved
(ng/
L (ng/L
as Mo
)
4 4 4 4 7 7 8 8 9 106 6
as
2, 2. 2. 2 2 2, 2 2 1 1<11
Ni)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Nick
el,
tota
l recov -
erable
(^g/L
as Ni)
2 3 6 2 2 2
<11 1 1 2 2
Sele
nium
, Sele-
Silv
er,
dis-
nium
, di
s
solved
tota
l solved
(ng/L
t^g/L
(ng/L
as Se)
as Se)
as Ag
)
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
Silver,
Uranium
tota
l natural,
recov-
dis-
erable
solved
(ng/L
(ng
as Ag
) as
<1
2 ,
<1
2,<1
2,
<1
2
<1
4<1
4
<1
4<1
4,
<1
5<1
6
<1
3<1
3
/L U) .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Zinc
, di
s
solved
(ng
as
6. 6. 8. 6. 5.<1
, 7. 6, 6, 6.105
/L Zn)
.0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Zinc
, to
tal
recov
erable
(ng/L
as Zn)
20 20 20<10
<10
<10
<10
<10
<10
<10
<10
<10
Tab
le 9
.--A
naly
tical
res
ults
on
repl
icat
e sa
mpl
es c
olle
cted
fro
m th
e R
io G
rand
e at
Cal
le d
el N
orte
Bri
dge
near
Mes
illa,
New
Mex
ico
[mg/
L, m
illi
gram
s pe
r lit
er;
deg
C, d
egre
es C
elsi
us;
|ug/
L, m
icro
gram
s pe
r lit
er;
<, l
ess
than
; un
fltr
d, u
nfilt
ered
]
Date
Aug
1996
07.
..21.. .
Oct 09
. ..
Dec 11
. .
.Fe
b 1997
11.
..27
. ..
Date
Aug 1996
07...
21.
..Oct 09
.. .
Dec 11
. ..
Feb
1997
11.
. .27.
..
Time
0840
0930
0850
0850
0945
1005
Anti
mony
, to
tal
as Sb)
2<1 <1 <1 <11
Carb
on,
organi
c,dis
solved
(mg/
Las
C)
3.5
3.4
3.4
3.5
3.3
3.9
Barium
, dis
solved
(Mg/
L as
Ba)
70 66 148
101
115 63
Carb
on,
orga
nic,
total
(mg/L
as C)
5.9
6.2
3.9
5.3
3.8
6.9
Beryl
lium
, dis
solved
(Mg/
Las
Be)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Calcium,
dis
-solved
(mg/L
as Ca
)
41 38 94 110
120 59
Beryl
lium,
tota
l recov
erable
as Be
)
<10
<10
<10
<10
<10
<10
Magne-
Hard
-sium,
ness
dis-
tota
lsolved
(mg/
L(mg/L
asas
Mg
) CaC0
3)
11
150
10
140
20
320
24
370
25
400
14
210
Cadmium
Cadmium,
water
dis-
unfltrd,
solved
tota
l (Mg/L
(Mg/L
as Cd)
as Cd
)
<1.0
<1<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1<1.0
<1
Solids,
residue
at 105
deg
C,total
(mg/
L)
534
430
890
1,07
0
1,080
610
Chro
mium,
dis
solved
(fig/L
as Cr
)
2.0
2.0
3.0
1.0
2.0
1.0
Alu-
Alu-
minu
m,
Anti-
minum,
tota
l mony,
dis-
recov-
dis
solved
erable
solved
(ug/L
(ug/
L (ug/L
as Al
) as
Al
) as
Sb
)
18
1,80
0 1.0
6.0
2,700
<1.0
5.0
910
<1.0
4.0
360
<1.0
4.0
90
<1.0
4.0
1,10
0 <1.0
Chro
mium
, Cobalt,
total
Cobalt,
tota
l recov-
dis-
re
cov
erable
solved
erable
as Cr
) as
Co)
as Co)
3 <1.0
<12
<1.0
1
<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1<1
<1.0
1
Tabl
e 9.
--A
naly
tical
resu
lts o
n re
plic
ate
sam
ples
col
lect
ed f
rom
the
Rio
Gra
nde
at C
alle
del
Nor
te B
ridg
ene
ar M
esill
a, N
ew M
exic
o C
oncl
uded
Copp
er,
dis
solv
ed(n
g/L
Date
as Cu)
Aug
1996
07.
..
2.0
21.
. .
2.0
Oct 09
...
2.0
Dec 11
. ..
2.0
Feb
1997
11...
<1.0
27.
..
<1.0
Copper ,
total
recov
erab
le(M
g/L
as Cu)
2 2
<1
1
<12
Lead,
Lead,
tota
ldis-
recov
-solved
erable
(Hg/L
(ng/L
as Pb)
as Pb)
<1 . 0
1<1 . 0
3
<1.0
<1
<1.0
<1
<1.0
<1<1
. 0
2
Mang
a -
nese
,di
sso
lved
(Mg/L
as Mn
)
<1 . 0
<1 .0
1.0
11 10 2.0
Mang
ane
se,
total
Mercury,
reco
v-
dis-
erable
solved
(ng/L
<ng/L
as Mn
) as
Hg)
170
<0.1
180
<0.1
40
<0.1
20
<0.1
20
<0.1
150
<0.1
Merc
ury,
tota
lre
cov
erable
(Mg/L
as Hg)
<0.1
0<0
.10
<0.1
0
<0.1
0
<0.10
<0.1
0
Moly
bde
num,
dis
solved
(M9/L
as Mo)
7.0
6.0
8.0
9.0
11 7.0
Moly
bde
num
,to
tal
reco
ver
able
(ng/
Las Mo)
4 4 7 8 9 5
Date
Aug
1996
07.
..21
. . .
Oct 09
...
Dec 11
. . .
Feb
1997
11..
.27.
..
Nick
el,
dis
solv
ed(Hg/L
as Ni
)
1.0
2.0
2.0
2.0
1.0
<1.0
Nickel,
Sele
-to
tal
nium
, Sele-
reco
v-
dis-
nium
,erable
solved
total
(Hg/L
(Mg/L
(ng/L
as Ni
) as Se)
as Se)
4 <1
<1
2 <1
<1
2 <1
<1
1 <1
<1
<1
<1
<12
<1
<1
Silv
er,
Uranium
Silv
er,
total
natu
ral.
dis-
recov-
dis
solved
erable
solv
ed(ng/L
(ng/L
(ng/L
as Ag)
as Ag
) as
U)
<1.0
<1
2.0
<1.0
<1
2.0
<1.0
<1
3.0
<1.0
<1
5.0
<1.0
<1
6.0
<1.0
<1
3.0
Zinc,
Zinc
, to
tal
dis-
recov
-solved
erable
(ng/L
(ng/L
as Zn)
as Zn)
7.0
504.0
<10
3.0
<10
5.0
<10
12
102.0
<10
Tab
le 1
0.--
Ana
lytic
al r
esul
ts o
n am
bien
t bla
nks
colle
cted
fro
m th
e R
io G
rand
e at
Cal
le d
el N
orte
Bri
dge
near
Mes
illa,
New
Mex
ico
[mg/
L, m
illi
gram
s pe
r lit
er;
ng/L
, mic
rogr
ams
per
liter
; <,
less
tha
n; u
nflt
rd, u
nfil
tere
d]
Date
Aug 1996
07.
. .
Oct 08
. .
.Dec 11
. ..
Feb 1997
27.
. .
Date
Aug 1996
07.
..Oct 08
. ..
Dec 11
. ..
Feb 1997
27.
. .
Alu-
Carbon,
Magne-
Alu-
minum,
Anti -
organic, Carbon,
Calcium,
sium,
minum,
total
mony,
Anti-
Barium,
dis-
organic,
dis-
dis-
dis-
recov-
dis-
mony,
dis
solved
total
solved
solved
solved
erable
solved
total
solved
(mg/L
(mg/L
(mg/L
(mg/L
(ng/L
(ng/L
(ng/L
(ng/L
(|ig
/LTime
as C)
as C)
as Ca)
as Mg)
as Al
) as Al
) as Sb)
as Sb
) as Ba)
0802
<0.10
0.20
<0.02
<0.01
3.0
<10
<1.0
<1
<1.0
0846
0.60
0.10
<0.02
<0.01
4.0
<10
<1.0
<1
<1.0
0812
<0.10
0.30
<0.02
<0.01
4.0
<10
<1 . 0
<1
<1.0
0932
<0.10
0.40
<0.02
<0.01
3.0
<10
<1.0
<1
<1.0
Beryl-
Chro-
Beryl-
lium,
Cadmium
Chro-
mium,
Cobalt,
lium,
total
Cadmium,
water
mium,
total
Cobalt,
total
Copper,
dis-
recov-
dis-
unfltrd,
dis-
recov-
dis-
recov-
dis
solved
erable
solved
total
solved
erable
solved
erable
solved
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
as Be)
as Be)
as Cd)
as Cd)
as Cr
) as Cr)
as Co)
as Co
) as Cu)
<1.0
<10
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1.0
<10
<1.0
<1
<1.0
<1
<1.0
<1
3.0
<1.0
<10
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1.0
<10
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
Tab
le 1
0. A
naly
tica
l re
sult
s on
am
bien
t bla
nks
colle
cted
fro
m th
e R
io G
rand
e at
Cal
le d
el N
orte
Bri
dge
near
Mes
illa,
New
Mex
ico
Con
clud
ed
Date
Aug 19
9607
. ..
Oct 08
. .
.Dec 11
. .
.Feb 1997
27.
..
Date
Aug 1996
07.
..Oct 08
. .
.Dec 11
. .
.Fe
b 1997
27.
..
Manga -
Copp
er,
Lead,
Manga-
nese,
Mercury,
tota
l Lead,
tota
l nese,
tota
l Mercury,
tota
lre
cov-
di
s-
recov-
dis-
recov-
dis-
recov
erable
solved
erable
solved
erable
solved
erable
<Hg/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
(ng/L
as Cu
) as
Pb)
as Pb)
as Mn)
as Mn)
as Hg
) as
Hg)
<1
<1.0
<1
<1.0
<10
<0.1
<O.XO
<1
<1.0
<1
<1.0
<10
<0.1
<0.10
<1
<1.0
<1
<1.0
<10
<0.1
<0.10
Nickel,
Sele-
Silv
er,
Uranium
Nickel,
total
nium
, Sele-
Silv
er,
tota
l natural,
dis-
recov-
dis-
ni
um,
dis-
recov-
dis
solved
erable
solved
total
solved
erable
solved
((ig
/L
((ig/L
((ig/L
(\iq/L
((ig/L
((ig/L
((ig/L
as Ni
) as
Ni)
as Se)
as Se)
as Ag)
as Ag)
as U)
<1.0
<1
<1
<1
<1.0
<1
<1
.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
<1.0
<1
<1
<1
<1.0
<1
<1.0
Molyb -
denum.
dis
-solved
(ng/L
as Mo
)
<1. 0
<1.0
<1.0
Zinc,
dis
- solved
(ng/L
as Zn
)
<1.0 5.0
3.0
2.0
Molyb
denum,
total
recov
erable
(ng/
Las
Mo
)
<1 <1 <1
Zinc
, to
tal
recov
erable
as Zn
)
<10
<10
<10
<10
Tab
le 1
1.~A
naly
tical
res
ults
on
equi
pmen
t bla
nks
[mg/
L, m
illi
gram
s pe
r lit
er;
ug/L
, mic
rogr
ams
per
liter
; <,
les
s th
an;
unfl
trd,
unf
ilte
red]
Carbon,
organic,
dis
solved
(mg/L
Date
Aug 1996
06.. .
07..
.20.
. .
21.. .
Oct 08
. .
.09.
..Dec 10
. ..
11.
. .
Feb 1997
11.
. .
12.
. .
27.
. .
28.. .
as 0. 0. 0. 0, 0, 0. 0, 0 0 0 0 0
C) .30
.20
.40
.20
.20
.20
.20
.10
.20
.20
.10
.20
Carbon,
organic,
total
(mg/L
as
0.<0
.<0
,<0
. 0, 0, 0,<0
0 0 0 0
C) .30
.10
.10
.10
.20
.10
.10
.10
.20
.30
.30
.20
Calcium,
dis
solved
(mg/L
as <0 .
<0 <0 <0 <00
<0<0 <0 0 0<0
Ca)
.02
.02
.02
.02
.02
.05
.02
.02
.02
.02
.05
.02
Magne -
sium,
dis
solved
(mg/L
as Mg
)
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
<0.01
Alu-
Alu-
minum,
minum,
total
dis-
recov-
solved
erable
(M<
as 3, 3 3 4 3 4 7 4 3 3 4 3
j/L
(Mg/L
Al)
as Al
)
. 0
<10
.0
<10
.0
<10
. 0
<10
. 0
<10
. 0
<10
.0
<10
.0
<10
.0
<10
. 0
<10
.0
10
.0
<10
Anti -
mony,
Anti-
di s -
mony ,
solved
total
(ug/L
(Mg/L
as Sb)
as Sb)
<1.0
<1<1.0
<1<1.0
<1<1.0
<1
<1.0
<1<1.0
<1
<1.0
<1<1.0
<1
<1.0
<1<1.0
<1
<1.0
<1
<1.0
<1
Barium,
dis
solved
(Mg/L
as Ba)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Beryl -
Beryl -
lium,
lium,
total
dis-
recov-
solved
erable
(ng/L
(Mg/L
as Be)
as Be)
<1.0
<10
<1.0
<10
<1.0
<10
<1 . 0
<10
<1 . 0
<10
<1 . 0
<10
<1.0
<10
<1.0
<10
<1.0
<10
<1 . 0
<10
<1 . 0
<10
<1 . 0
<10
Cadmium,
dis
solved
(Mg/L
as Cd
)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Tab
le 1
1.-A
naly
tica
l res
ults
on
equi
pmen
t bla
nks
Con
tinu
ed
Cadm
ium
water
unf Itrd,
tota
l<n
g/L
Date
as Cd)
Aug
1996
06...
<107...
<120...
<121...
<1Oct 08
...
<109...
<1Dec 10
. . .
<1
11.
. .
<1Feb
1997
11...
<112.
..
<127...
<128...
<1
Chro
-Ch
ro-
mium
.mium,
tota
l Co
balt
,dis-
reco
v-
dis
solv
ed
erab
le
solv
ed(ng/L
(ng/
L (ng/L
as Cr)
as Cr
) as Co)
<1. 0
<1
<1.
0<1
. 0
<1
<1. 0
<1. 0
<1
<1 .
0<1
. 0
<1
<1.
0
<1. 0
<1
<1 .
0<1. 0
<1
<1 . 0
<1.0
<1
<1.0
<1. 0
<1
<1 . 0
<1 . 0
<1
<1. 0
<1. 0
<1
<1 . 0
<1.0
<1
<1 . 0
<1 . 0
<1
<1. 0
Coba
lt,
Copp
er,
total
Copp
er,
total
recov-
dis-
recov
erab
le
solved
erab
le(ng/L
(ng/L
(ng/L
as Co
) as Cu
) as Cu
)
<1
<1.0
<1
<1
<1.0
1<1
<1.0
<1
<1
<1.0
<1
<1
<1.0
<1
<1
3.0
<1
<1
<1.0
<1<1
5.0
<1
<1
1.0
<1<1
2.0
<1<1
2.0
<1<1
<1.0
<1
Lead
,di
ssolved
(ng/L
as Pb)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Manga
-Lead,
Manga-
nese.
total
nese,
total
Merc
ury,
reco
v-
dis-
recov-
dis-
erab
le
solv
ed
erab
le
solv
ed(ng/L
(ng/L
(ng/
L (ng/L
as Pb)
as Mn)
as Mn)
as Hg)
<1
<1 . 0
<10
<0 . 1
<1
<1 . 0
<10
<0 . 1
<1
<1 . 0
<10
<0 . 1
<1
<1 . 0
<10
<0 . 1
<1
<1.0
<10
<0.1
<1
<1 . 0
<10
<0 . 1
<1
<1. 0
<10
<0 . 1
<1
<1 . 0
<10
<0. 1
<1
<1.0
<1
0 <0
.1<1
<1 . 0
<10
<0 . 1
<1
<1.0
<1
0 <0
.1<1
<1.0
<10
<0.1
Tabl
e 11
. Ana
lytic
al r
esul
ts o
n eq
uipm
ent b
lank
s C
oncl
uded
Merc
ury,
Mo
lyb-
to
tal
denum,
recov-
dis-
erab
le
solv
ed(ug/L
(ug/L
Date
Aug
1996
06...
07...
20..
.21...
Oct 08
...
09...
Dec 10
.. .
11.
. .Feb
1997
11.
. .12...
27.
..28.
. .
as <0.
<0.
<0.
<0.
<0.
<0.
<0,
<0.
<0 <0 <0 <0
Hg)
as Mo
)
10
<1.0
,10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
.10
<1.0
Molyb
denum,
total
Nick
el,
reco
v-
dis-
er
able
solved
(ug/
L (ug/L
as Mo)
as Ni
)
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
1 <1
.0<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
<1
<1.0
Nick
el,
Sele
- Si
lver
, total
nium
, Sele-
Silv
er,
tota
l recov-
dis-
ni
um,
dis-
reco
v
erab
le
solved
tota
l solved
erable
(ug/L
(pg/L
(ug/L
(ug/L
(ug/L
as Ni
) as Se)
as Se)
as Ag)
as Ag)
<1
<1
<1
<1.0
<1<1
<1
<1
<1.0
<1<1
<1
<1
<1.0
<1<1
<1
<1
<1.0
<1
<1
<1
<1
<1.0
<1<1
<1
<1
<1.0
<1
<1
<1
<1
<1.0
<1
<1
<1
<1
<1.0
<1
<1
<1
<1
<1.0
<1
<1
<1
<1
<1.0
<1<1
<1
<1
<1.0
<1
<1
<1
<1
<1.0
<1
Uran
ium
natu
ral,
dis
solved
(ug/L
as U)
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Zinc,
Zinc,
total
dis-
re
cov
- solved
erable
(ug/L
(ug/L
as Zn)
as Zn)
2. 2, 9. 4.
<1.
11
5 6, 3 8 15 2
,0
20. 0
<10
. 0
<10
.0
<10
.0
<10
<10
. 0
<10
. 0
<10
. 0
<10
. 0
<10
<10
. 0
<10
Tab
le 1
2.--
Abs
olut
e an
d re
lativ
e di
ffer
ence
s be
twee
n se
lect
ed c
onst
ituen
ts i
n en
viro
nmen
tal
and
repl
icat
e sa
mpl
es
colle
cted
fro
m th
e R
io G
rand
e at
Pic
acho
Bri
dge
near
Las
Cru
ces,
New
Mex
ico
[E, c
once
ntra
tion
of c
onst
ituen
t in
envi
ronm
enta
l sa
mpl
e; R
, con
cent
ratio
n of
con
stitu
ent i
n re
plic
ate
sam
ple;
%
, per
cent
; mg/
L, m
illig
ram
s pe
r lit
er; B
RL
, E a
nd/o
r R
less
than
the
min
imum
rep
ortin
g le
vel]
Dis
solv
ed s
olid
s
Dat
e
Aug
ust
6, 1
996
Aug
ust
20,
1996
Oct
ober
8,
199
6
Dec
em
ber
10,
1996
Febr
u
ary
12,
1997
Febr
u
ary
28,
1997
(E-R
), in
mg/
L
30 -32
-22 0 0 2
lEiRJ
x
100%
(E+R
)/2 5.7
4.2
2.6
0 0 0.3
Org
anic
car
bon,
dis
solv
ed
(E-R
), J&
R1
x 10
0%
in m
g/L
(E
+R)/
2
0.1
3
0 0
0 0
0 0
0.1
4
-0.2
5
Org
anic
car
bon,
tota
l
(E-R
), in
mg/
L
-0.8 0.6
-0.3
-0.4
-1.1
-0.7
1E=E
1 x
100%
(E
+R)/
2 7 10 7 10 25 10
Cal
cium
, dis
solv
ed
(E-R
), in
mg/
L
0 -1 0 0
-10 -1
1E=&
1 x
100%
(E
+R)/
2 0 3 0 0 8.7
2
Mag
nesi
um,d
isso
lved
(E-R
), lE
zEl
x 10
0o/0
in
mg/
L
(E+R
)/2
0 -0.3 0 0 -1 -1
0 3 0 0 4 7
Tab
le 1
2.-A
bsol
ute
and
rela
tive
diff
eren
ces
betw
een
sele
cted
con
stitu
ents
in e
nvir
onm
enta
l and
rep
licat
e sa
mpl
es
colle
cted
fro
m th
e R
io G
rand
e at
Pic
acho
Bri
dge
near
Las
Cru
ces,
New
Mex
ico
Con
clud
ed
Bar
ium
, dis
solv
ed
Chr
omiu
m, d
isso
lved
C
hrom
ium
, tot
al
Alu
min
um, d
isso
lved
A
lum
inum
, tot
al
(E-R
), lE
zRL
xlO
Qo/o
(E
-R),
1E.R
J x
100o
/0 (E
-R),
JirR
L
x 10
0%
(E-R
)> M
x
100%
(E
-R),
lEiR
J x
100%
D
ate
inm
g/L
(E
+R)/
2 in
mg/
L
(E+R
)/2
inm
g/L
(E
+R)/
2 in
mg/
L
(E+R
)/2
inm
g/L
(E
+R)/
2
Aug
ust
- 1
6, 1
996
Aug
ust
-4
20,
1996
Oct
ober
0
8, 1
996
Dec
em-
-4
her
10,
1996
Febr
u-
-7
ary
12,
1997
Febr
u-
-4
ary
28,
1997
1 0
0 B
RL
B
RL
-1
5
-200
10
6 B
RL
B
RL
1
30
2 20
60
0 30
000
BR
L
BR
L
-1
20
-100
7
300
00
00
10
20
600
BR
L
BR
L
1 20
00
600
BR
L
BR
L
0 0
-100
9
Tabl
e 13
. Abs
olut
e an
d re
lativ
e di
ffer
ence
s be
twee
n se
lect
ed c
onst
ituen
ts in
env
iron
men
tal a
nd s
plit
sam
ples
colle
cted
at t
he C
ity o
f Las
Cru
ces
was
tew
ater
-tre
atm
ent p
lant
[E, c
once
ntra
tion
of co
nstit
uent
in e
nviro
nmen
tal s
ampl
e; S
, con
cent
ratio
n of
cons
titue
nt in
spl
it sa
mpl
e;
ug/L
, mic
rogr
ams
per
liter
; BR
L, E
and
/or S
less
than
the
min
imum
repo
rtin
g le
vel]
Chr
omiu
m, d
isso
lved
Dat
e
Aug
ust 6
, 19
96
Aug
ust 7
, 19
96
Aug
ust 2
0,
1996
Aug
ust 2
1,
1996
Oct
ober
8,
1996
Oct
ober
9,
1996
Dec
embe
r 10
, 19
96
Dec
embe
r 11
,199
6
Febr
uary
11
,199
7
Febr
uary
12
, 19
97
Febr
uary
27
, 19
97
Febr
uary
28
, 19
97
(E-S
), in
|ng/
L
0 0 0 0 0 0 BR
L
0 0 0 0 0
JE=S
l x
100%
(E
+S)/2
0 0 0 0 0 0 BR
L
0 0 0 0 0
Man
gane
se, d
isso
lved
(E-S
), in
|ng/
L
0 0 0 0 0 0 0 0 0 0 0 1
1E=S
1 x
100%
(E
+S)/2
0 0 0 0 0 0 0 0 0 0 0 1
Man
gane
se, t
otal
(E-S
), in
|ig/L
0 0 0 0 10 10 0 0 0 20 0 0
^=Sl
x
100%
(E
+S)/2
0 0 0 0 20 20 0 0 0 40 0 0
Nic
kel,
diss
olve
d
(E-S
), in
|ng/
L
0 0 BR
L
0 0 0 0 0 0 0 0 0
^=81
x
100%
(E
+S)/2
0 0 BR
L
0 0 0 0 0 0 0 0 0
Zinc
, tot
al
(E-S
), in
|tig/
L
10 0 0 0 0 0 0 0 0 0 0 0
KkS
l x
100%
(E
+S)/2
40 0 0 0 0 0 0 0 0 0 0 0
Tabl
e 14
.-A
bsol
ute
and
rela
tive
diff
eren
ces
betw
een
sele
cted
con
stitu
ents
in e
nvir
onm
enta
l and
rep
licat
e sa
mpl
es
colle
cted
fro
m th
e R
io G
rand
e at
Cal
le d
el N
orte
Bri
dge
near
Mes
illa,
New
Mex
ico
[E, c
once
ntra
tion
of c
onst
ituen
t in
envi
ronm
enta
l sa
mpl
e; R
, con
cent
ratio
n of
con
stitu
ent i
n re
plic
ate
sam
ple;
m
g/L
, mill
igra
ms
per
liter
; |L
ig/L
, mic
rogr
ams
per
liter
; BR
L, E
and
/or
R le
ss th
an th
e m
inim
um re
port
ing
leve
l]
Dis
solv
ed s
olid
s
(E-R
), D
ate
in m
g/L
Aug
ust 7
, 94
1996
Aug
ust
262
21,1
996
Oct
ober
-6
9, 1
996
<°
Dec
em-
0he
r 11
,19
96
Febr
uary
10
11,1
997
Febr
uary
4
27,
1997
J^=£
l x
100%
(E
+R)/
2
16 46.7 0.7
0 0.9
0.7
Org
anic
car
bon,
dis
solv
ed
(E-R
), in
mg/
L
-0.2
-0.1
-0.2 0 0.1
-0.1
IE-RI
x 100
%(E
+R)/
2 6 3 6 0 3 3
Org
anic
car
bon,
tot
al
(E-R
),in
mg/
L
0.4
0 0 -1.6 0.1
-0.8
1E=£
1 x
100%
(E
+R)/
2 7 0 0 36 3 12
Cal
cium
, dis
solv
ed
(E-R
), in
mg/
L
-1 0 -1 -10
-10 -2
lE^S
l x
100%
(E+R
)/2 2 0 1 10 9 3
Mag
nesi
um, d
isso
lved
(E-R
), in
mg/
L
-1 0 0 -2 -2 -1
JE^l
x
100%
(E+R
)/2 10 0 0 9 9 7
Bar
ium
(E-R
), in
ng/
L
-2 0 6 -5 -10 -2
, dis
solv
ed
|E=R
l x
100%
(E
+R)/
2 3 0 4 5 9 3
Tabl
e 14
.--A
bsol
ute
and
rela
tive
diff
eren
ces
betw
een
sele
cted
con
stitu
ents
in
envi
ronm
enta
l an
d re
plic
ate
sam
ples
fr
om th
e R
io G
rand
e at
Cal
le d
el N
orte
Bri
dge
near
Mes
illa,
New
Mex
ico
Con
clud
ed
Chr
omiu
m, d
isso
lved
Dat
e
Aug
ust 7
, 19
96
Aug
ust
21,
1996
Oct
ober
9,
199
6
Dec
em
ber
11,
1996
Febr
uary
11
, 19
97
Febr
uary
27
, 19
97
(E-R
),
0 -1 0 0 0 0
JE^
x 10
0%
(E+R
)/2 0 67 0 0 0 0
Chr
omiu
m, t
otal
(E-R
), lE
rRJ
x 10
0o/o
in
ng/
L
(E+R
)/2
-2
100
0 0
BR
L
BR
L
BR
L
BR
L
BR
L
BR
L
BR
L
BR
L
Alu
min
um, d
isso
lved
(E-R
),
3 -1 0 2 1 2
JE=£
1 x
100%
(E
+R)/
2 15 20 0 40 20 40
Alu
min
um, t
otal
(E-R
), in
Mg/
L
100
-200 90
-310 0 0
lEiS
l x
100%
(E
+R)/
2 5 8 9.4
150 0 0
Ura
nium
, dis
solv
ed
(E-R
),
0 0 1 -1 -1 0
1EJR
1 x
100%
(E
+R)/
2 0 0 30 20 20 0
Tabl
e 15
. Spi
ke r
ecov
erie
s in
env
iron
men
tal
sam
ples
col
lect
ed a
t the
City
of L
as C
ruce
s w
aste
wat
er-t
reat
men
t pla
nt[A
ll va
lues
are
per
cent
ages
]
Sam
plin
g da
te
Aug
ust 6
, 19
96
Aug
ust 7
, 19
96
Aug
ust 2
0,
1996
Aug
ust 2
1 ,
1996
Oct
ober
8,
1996
Oct
ober
9,
1996
Dec
embe
r 10
, 19
96
Dec
embe
r 11
,199
6
Febr
uary
11,
19
97
Febr
uary
12,
19
97
Febr
uary
27,
19
97
Febr
uary
28,
19
97
Car
bon,
di
ssol
ved
99 99 100 96 106
104 95 96 85 102
102 97
Org
anic
ca
rbon
, tot
al
102 92 104
116
100
103 88 160
100 80 97 106
Bar
ium
, di
ssol
ved
107
103
106
104
103 99 101 97 101 99 102
104
Alu
min
um,
diss
olve
d
98 92 84 85 90 88 97 103 92 92 95 95
Alu
min
um,
tota
l
109
105
108
109 93 88 98 107
109
100 89 97
Ant
imon
y,
diss
olve
d
113
113
112
110
100 99 101
100 99 99 102
102
Ant
imon
y,
tota
l
88 83 84 102 83 96 97 85 87 86 92 107
Ber
ylliu
m,
diss
olve
d
108 98 92 90 100 94 103
105
101
100
102
102
Tab
le 1
5.-S
pike
rec
over
ies
in e
nvir
onm
enta
l sa
mpl
es c
olle
cted
at t
he C
ity o
f Las
Cru
ces
was
tew
ater
-tre
atm
ent p
lant
Con
tinu
ed
Sam
plin
g da
te
Aug
ust 6
, 19
96
Aug
ust 7
, 19
96
Aug
ust 2
0,
1996
Aug
ust 2
1 ,
1996
Oct
ober
8,
1996
Oct
ober
9,
1996
Dec
embe
r 10
, 19
96
Dec
embe
r 11
, 19
96
Febr
uary
11,
19
97
Febr
uary
12,
19
97
Febr
uary
27,
19
97
Febr
uary
28,
19
97
Ber
ylliu
m,
tota
l
97 101 94 102 96 94 93 95 88 96 88 95
Cad
miu
m,
diss
olve
d
98 98 101 97 99 97 97 98 97 97 96 97
Cad
miu
m,
tota
l
99 102 96 108
104
106 97 95 108
106
106
106
Chr
omiu
m,
diss
olve
d
90 90 94 94 92 92 95 99 90 91 92 93
Chr
omiu
m,
tota
l
90 194
111
109
102
101
100
103
102
103
106
103
Cob
alt,
diss
olve
d
91 90 97 95 94 94 95 99 94 93 95 96
Cob
alt,
tota
l
108
106 88 94 104
101 99 99 105
103
105
105
Cop
per,
diss
olve
d
93 96 98 97 99 97 100
101 99 97 97 98
Tabl
e 15
. Spi
ke re
cove
ries
in e
nvir
onm
enta
l sam
ples
col
lect
ed a
t the
City
of L
as C
ruce
s w
aste
wat
er-t
reat
men
t pla
nt C
ontin
ued
Sam
plin
g da
te
Aug
ust 6
, 19
96
Aug
ust 7
, 19
96
Aug
ust 2
0,
1996
Aug
ust 2
1,
1996
Oct
ober
8,
1996
Oct
ober
9,
1996
Dec
embe
r10
, 19
96
Dec
embe
r11
,199
6
Febr
uary
11,
19
97
Febr
uary
12,
19
97
Febr
uary
27,
19
97
Febr
uary
28,
19
97
Cop
per,
tota
l
104
112 94 95 102
101 91 109
103 97 89 98
Lea
d,
diss
olve
d
103
102
104
103
101
101 99 98 97 96 95 95
Lea
d, to
tal
101
102 94 103
103
105
101 92 98 99 101 98
Man
gane
se,
diss
olve
d
92 92 96 94 95 97 96 98 91 91 95 95
Man
gane
se,
tota
l
92 98 90 97 88 91 96 96 90 117 94 84
Mer
cury
, di
ssol
ved
105
103
103 94 111 92 103
100
113
110
103
101
Mer
cury
, to
tal
108 98 93 95 94 97 99 105
101
101 84 87
Mol
ybde
nu
m,
diss
olve
d
104
103
104
102 96 94 98 98 98 98 99 100
Mol
ybde
nu
m, t
otal
90 90 97 95 91 94 90 85 102 95 99 99
Tabl
e 15
. Spi
ke r
ecov
erie
s in
env
ironm
enta
l sam
ples
col
lect
ed a
t the
City
of L
as C
ruce
s w
aste
wat
er-t
reat
men
t pla
nt C
oncl
uded
Sam
plin
g da
te
Aug
ust 6
, 19
96
Aug
ust 7
, 19
96
Aug
ust 2
0,
1996
Aug
ust 2
1 ,
1996
Oct
ober
8,
1996
Oct
ober
9,
1996
Dec
embe
r 10
, 19
96
Dec
embe
r 11
, 19
96
Febr
uary
1 1
, 19
97
Febr
uary
12,
19
97
Febr
uary
27,
19
97
Febr
uary
28,
19
97
Nic
kel,
diss
olve
d
86 90 94 94 95 89 90 100 91 88 89 89
Nic
kel,
tota
l
108
260 69 104
105
100 99 98 99 98 106
105
Sele
nium
, di
ssol
ved
120 95 100 99 86 81 89 97 95 97 118 93
Sele
nium
, to
tal
108
103
104
117 81 92 90 98 103
105
105
110
Silv
er,
diss
olve
d
92 90 94 93 93 93 87 90 94 93 90 91
Silv
er, t
otal
104
114
100
100 90 90 92 94 98 96 92 94
Ura
nium
, di
ssol
ved
95 99 101
101 98 100 94 94 95 92 98 98
Zin
c,
diss
olve
d
84 87 94 95 99 89 93 95 89 82 100 98
Zin
c, to
tal
98 120
106 92 93 95 112
132 97 102
102
100
Table 16. Minimum, median, and maximum values for constituents in all ambient blanks in which at least one analysis exceeds the minimum reporting level for that constituent
[mg/L, milligrams per liter; <, less than; Mg/L, micrograms per liter]
Constituent
Organic carbon, dissolved
Organic carbon, total
Calcium, dissolved
Aluminum, dissolved
Aluminum, total
Antimony, dissolved
Copper, dissolved
Zinc, dissolved
Minimumreporting
level
0.1 mg/L
0.1 mg/L
0.02 mg/L
1.0 ^ig/L
10 Mg/L
1.0 Mg/L
1.0 Mg/L
1.0 Mg/L
Minimum concentration
<0.1mg/L
<0.1 mg/L
<0.02 mg/L
< 1.0 Mg/L
<10Mg/L
<1.0Mg/L
<1.0Mg/L
< 1.0 Mg/L
Median concentration
<0.1 mg/L
0.2 mg/L
O.02 mg/L
3.0 Mg/L
<10Mg/L
< 1.0 Mg/L
< 1.0 Mg/L
2.0 Mg/L
Maximum concentration
0.6 mg/L
0.4 mg/L
0.02 mg/L
6.0 Mg/L
10 Mg/L
1.0 Mg/L
3.0 Mg/L
5.0 Mg/L
Number of analyses,
from a total of 12,
showing values
greater than the
minimumreporting
level
1
9
1
11
1
1
1
8
45
Table 17. Minimum, median, and maximum values for constituents in all equipment blanks in which at least one analysis exceeds the minimum reporting level for that constituent
[mg/L, milligrams per liter; <, less than; jug/L, micrograms per liter]
Constituent
Organic carbon, dissolved
Organic carbon, total
Calcium, dissolved
Aluminum, dissolved
Copper, dissolved
Copper, total
Molybdenum, total
Zinc, dissolved
Zinc, total
Minimumreporting
level
0.1 mg/L
O.lmg/L
0.02 mg/L
l.Oug/L
l.Oug/L
l.Oug/L
l.Oug/L
l.Oug/L
10 ug/L
Minimum concentration
O.lmg/L
<0.1mg/L
<0.02 mg/L
3.0 ug/L
< l.Oug/L
<lug/L
<1 ug/L
< 1.0 ug/L
<10ug/L
Median concentration
0.2 mg/L
0.2 mg/L
<0.02 mg/L
3.0 ug/L
< 1.0 ug/L
<lug/L
<lug/L
5.0 ug/L
<10ug/L
Maximum concentration
0.4 mg/L
0.3 mg/L
0.05 mg/L
7.0 ug/L
5.0 ug/L
lug/L
lug/L
15 ug/L
20 ug/L
Number of analyses,
from a total of 12,
showing values
greater than the
minimumreporting
level
12
8
3
8
5
1
1
11
1
46
Tabl
e 18
. Rec
over
ies
in s
tand
ard
refe
renc
e w
ater
sam
ples
[*, n
o ra
nge
avai
labl
e; %
, per
cent
]
Org
anic
car
bon,
dis
solv
ed
Ran
ge
ofSa
mpl
e re
cove
ry,
set
in
num
ber
perc
ent
1 *
2 *
3 *
4 *
5 *
6 *
Med
ian
reco
very
, in
pe
rcen
t
99.4
102
101 99
.0
98.0
102
Num
ber
of
dete
rmi
na
tions
1 1 1 1 1 1
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0+20
%of
the
expe
cted
va
lue
1 1 1 1 1 1
Ran
ge
ofre
cove
ry,
in
perc
ent
95.5
to
102
96.0
to10
5
97.0
to10
0
98.0
to98
.0 * *
Org
anic
car
bon,
tot
al
Med
ian
reco
very
, in
pe
rcen
t
98.3
98.0
98.0
98.0
98.0
100
Num
ber
of
dete
rmi
na
tions
3 3 3 2 1 1
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0+20
%of
the
expe
cted
va
lue
3 3 3 2 1 1
Ran
ge
ofre
cove
ry,
in
perc
ent
100
to10
2
97.8
to10
2
98.7
to10
3
97.6
to10
3
101
to10
3
101
to10
4
Cal
cium
,
Med
ian
reco
very
, in
pe
rcen
t
101
100
101
103
103
103
diss
olve
d
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Tabl
e 18
.-R
ecov
erie
s in
sta
ndar
d re
fere
nce
wat
er s
ampl
es C
onti
nued
Mag
nesi
um, d
isso
lved
Ran
ge
ofSa
mpl
e re
cove
ry,
set
in
num
ber
perc
ent
1 10
1 to
104
2 97
.9 t
o10
3
3 98
.5 t
o10
3
4 98
.8 t
o10
1
5 10
1 to
102
6 10
0 to
103
Med
ian
reco
very
, in
pe
rcen
t
104
102
101 99
.9
102
101
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
96.0
to11
4
93.0
to97
.5
92.0
to10
3
98.5
to
116
69.5
to
101
78.5
to
102
Alu
min
um, d
isso
lved
Med
ian
reco
very
, in
pe
rcen
t
102 95.1
101
104 91
.0
101
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 4 4
Ran
ge
ofre
cove
ry,
in
perc
ent
100
to11
7
91.1
to
124
83.5
to
113
87.1
to
117
88.5
to
107
96.5
to
110
Alu
min
um, t
otal
Med
ian
reco
very
, in
pe
rcen
t
111
105
105 97
.1
102
105
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0+20
%of
the
expe
cted
va
lue
5 3 5 5 5 5
Tabl
e 18
. Rec
over
ies
in s
tand
ard
refe
renc
e w
ater
sam
ples
Con
tinue
d
Ant
imon
y, d
isso
lved
Ran
ge
of
Sam
ple
reco
very
, se
t in
nu
mbe
r pe
rcen
t
109
to
119
106
to
116
98.7
to
107
80.3
to
116
99.8
to
102
100
to
6 10
6
Med
ian
reco
very
, in
pe
rcen
t
111
109
101
104
100
103
Num
ber
of
dete
rmi
na
tions
3 3 3 4 3 3
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%
of th
e ex
pect
ed
valu
e
3 3 3 4 3 3
Ran
ge
of
reco
very
, in
pe
rcen
t
112
to
121
68.1
to
120
82.0
to
113
104
to
139
110
to
112
100
to
128
Ant
imon
y, to
tal
Med
ian
reco
very
, in
pe
rcen
t
112
103
103
117
111
106
Num
ber
of
dete
rmi
na
tions
3 4 3 3 3 3
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%
of th
e ex
pect
ed
valu
e
2 3 3 2 3 2
Ran
ge
of
reco
very
, in
pe
rcen
t
98.3
to
101
98.9
to
102
101
to
102
98.6
to
104
94.4
to
104
94.8
to
101
Bar
ium
, dis
solv
ed
Med
ian
reco
very
, in
pe
rcen
t
98.6
99.6
102
101
102 99
.0
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0+20
%
of th
e ex
pect
ed
valu
e
5 5 5 5 5 5
Tab
le 1
8.~R
ecov
erie
s in
sta
ndar
d re
fere
nce
wat
er s
ampl
es C
onti
nued
8
Ran
ge
of
Sam
ple
reco
very
, se
t in
nu
mbe
r pe
rcen
t
96.8
to
122
93. 8
to
99.2
100
to
110
4 10
1 to
10
5
99.5
to
104
97.1
to
6 10
5
Ber
ylliu
m
Med
ian
reco
very
, in
pe
rcen
t
102 96.7
105
103
103
104
, dis
solv
ed
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Ber
ylliu
m, t
otal
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%
of th
e ex
pect
ed
valu
e
4 5 5 5 5 5
Ran
ge
of
reco
very
, in
pe
rcen
t
90.5
to
100
99.6
to
109
90.2
to
103
100
to
102
94.9
to
97.1
100
to
102
Med
ian
reco
very
, in
pe
rcen
t
90.9
103 99
.6
101 96
.0
100
Num
ber
of
dete
rmi
na
tions
3 5 5 2 2 3
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%
of th
e ex
pect
ed
valu
e
3 5 5 2 2 3
Ran
ge
of
reco
very
, in
pe
rcen
t
100
to
102
96.6
to
112
101
to
107
98.1
to
106
97.2
to
113
99.4
to
107
Cad
miu
m, d
isso
lved
Med
ian
reco
very
, in
pe
rcen
t
101
103
103
103
103
103
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%
of th
e ex
pect
ed
valu
e
5 5 5 5 5 5
Tabl
e 18
.-Rec
over
ies
in s
tand
ard
refe
renc
e w
ater
sam
ples
-Con
tinue
d
Cad
miu
m, t
otal
Sam
ple
set
num
ber
1 2 3 4 5 6
Ran
ge
ofre
cove
ry,
in
perc
ent
98.8
to10
3
98.2
to10
2
101
to10
6
94.2
to10
3
100
to10
7
102
to10
6
Med
ian
reco
very
, in
pe
rcen
t
100 99.3
104 98.9
102
104
Num
ber
of
dete
rmi
na
tions
3 4 4 5 3 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
verie
sw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 4 4 5 3 5
Ran
ge
ofre
cove
ry,
in
perc
ent
97.3
to
107
99.9
to10
9
99.3
to
111
99.7
to11
3
95.8
to10
4
98.2
to10
8
Chr
omiu
m, d
isso
lved
Med
ian
reco
very
, in
pe
rcen
t
98.6
104
101
106
101
103
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
88.2
to10
8
103
to11
0
58.8
to10
3
91. 6
to10
0
96.8
to10
3
82.2
to10
5
Chr
omiu
m, t
otal
Med
ian
reco
very
, in
pe
rcen
t
105
105 96.8
97.2
97.9
99.4
Num
ber
of
dete
rmi
na
tions
3 3 5 4 4 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 3 4 4 4 5
Tabl
e 18
.--R
ecov
erie
s in
sta
ndar
d re
fere
nce
wat
er s
ampl
es C
onti
nued
Cob
alt,
diss
olve
d
Sam
ple
set
num
ber
1 2 3 4 5 6
Ran
ge
ofre
cove
ry,
in
perc
ent
94.6
to
109
99.2
to
113
97.9
to
106
96.9
to
114
94.8
to
108
99.0
to
109
Med
ian
reco
very
, in
pe
rcen
t
97.2
102
102
102 98
.4
104
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
98.8
to
103
102
to
123
108
to
114
104
to
116
114
to
118
112
to
118
Cob
alt,
tota
l
Med
ian
reco
very
, in
pe
rcen
t
100
114
113
111
116
116
Num
ber
of
dete
rmi
na
tions
3 4 4 5 3 4
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 3 4 5 3 4
Ran
ge
ofre
cove
ry,
in
perc
ent
94.4
to
104
92.7
to
105
97.5
to
105
92.0
to
118
95.2
to
107
101
to
106
Cop
per,
diss
olve
d
Med
ian
reco
very
, in
pe
rcen
t
97.5
98.7
99.7
104 98.1
103
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Tabl
e 18
.-R
ecov
erie
s in
sta
ndar
d re
fere
nce
wat
er s
ampl
es C
ontin
ued
Cop
per,
tota
l
Ran
ge
ofSa
mpl
e re
cove
ry,
set
in
num
ber
perc
ent
95.0
to
102
85.4
to
102
80.0
to
105
93.1
to
104
95.0
to
99.4
, 97
.7 to
6
102
Med
ian
reco
very
, in
pe
rcen
t
97.1
97.0
103 99
.0
98.0
100
Num
ber
of
dete
rmi
na
tions
3 4 4 5 3 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 4 4 5 3 5
Ran
ge
ofre
cove
ry,
in
perc
ent
98.2
to
102
100
to
103
101
to
121
97.8
to
117
95.9
to
120
97.6
to
118
Lea
d, d
isso
lved
Med
ian
reco
very
, in
pe
rcen
t
99.6
101
103
102
104 99
.7
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 4 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
102
to
109
95.0
to
99.4
100
to
107
92.5
to
112
91.0
to
102
97.0
to
108
Lea
d, to
tal
Med
ian
reco
very
, in
pe
rcen
t
106 97
.0
104
109 99
.9
106
Num
ber
of
dete
rmi
na
tions
3 4 4 5 3 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 4 4 5 3 5
Tabl
e 18
. Rec
over
ies
in s
tand
ard
refe
renc
e w
ater
sam
ples
Con
tinue
d
Man
gane
se, d
isso
lved
Ran
geof
Sam
ple
reco
very
,se
t in
num
ber
perc
ent
95.6
to10
4
98.3
to10
4
99.3
toi r
\(\
109
4 97
.7 to
110
101
to
102
99.1
to
6 10
5
Med
ian
reco
very
,in
perc
ent
101
103
103
103
102
103
Num
ber
ofde
term
ina
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
natio
ns
havi
ng
reco
verie
sw
ithin
100±
20%
of th
eex
pect
edva
lue
5 5 5 5 5 5
Ran
geof
reco
very
,in
perc
ent
94.4
to10
6
83. 7
to95
.2
95.9
to97
.1
99.1
to
116
93 .9
to
106
94.6
to10
0
Man
gane
se, t
otal
Med
ian
reco
very
,in
perc
ent
96.7
94.3
96.4
103
104 99
.2
Num
ber
ofde
term
ina
tions
5 5 3 3 4 3
Num
ber
of
dete
rmi
natio
ns
havi
ng
reco
verie
sw
ithin
100±
20%
of th
eex
pect
edva
lue
5 5 3 3 4 3
Ran
geof
reco
very
,in
perc
ent
101
to10
9
94.2
to11
1
lllt
o11
4
101
to10
6
105
to
122
75.6
to10
6
Mer
cury
, dis
solv
ed
Med
ian
reco
very
,in
perc
ent
105
105
112
105
110
101
Num
ber
ofde
term
ina
tions
5 5 2 3 3 4
Num
ber
of
dete
rmi
natio
ns
havi
ng
reco
verie
sw
ithin
100+
20%
of th
eex
pect
edva
lue
105
105
112
105 2 3
Tabl
e 18
.-R
ecov
erie
s in
sta
ndar
d re
fere
nce
wat
er s
ampl
es C
onti
nued
Mer
cury
, to
tal
Ran
ge
ofSa
mpl
e re
cove
ry,
set
in
num
ber
perc
ent
96.2
to
117
83.0
to
130
93.1
to
101
70.7
to
107
83.0
to
104
77.0
to
6 10
0
Med
ian
reco
very
, in
pe
rcen
t
103 89
.4
97.3
87.2
99.6
89.0
Num
ber
of
dete
rmi
na
tions
5 4 2 4 4 4
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 3 2 3 4 2
Ran
ge
ofre
cove
ry,
in
perc
ent
98.0
to
107
98.6
to
104
96.4
to
99.7
97.5
to
101
100
to
105
99.5
to
105
Mol
ybde
num
, di
ssol
ved
Med
ian
reco
very
, in
pe
rcen
t
103
100 97.2
99.2
104
100
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0+20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
92.4
to
99.5
93.5
to
112
91.0
to
95.2
94.6
to
119
71.4
to
96.6
81.0
to
102
Mol
ybde
num
, to
tal
Med
ian
reco
very
, in
pe
rcen
t
92.4
101 92
.4
99.1
93.7
96.6
Num
ber
of
dete
rmi
na
tions
3 4 4 4 4 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 4 4 4 3 5
Tabl
e 18
. Rec
over
ies
in s
tand
ard
refe
renc
e w
ater
sam
ples
Con
tinu
ed
Nic
kel,
diss
olve
d
Sam
ple
set
num
ber
1 2 3 4 5 6
Ran
ge
ofre
cove
ry,
in
perc
ent
87.1
to
94.8
95.0
to
101
90.0
to
112
94.3
to
114
93.6
to
120
95.8
to
119
Med
ian
reco
very
, in
pe
rcen
t
93.1
95.8
96.9
111 95
.7
99.8
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 5 5 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
97.7
to
109
100
to
106
97.7
to
104
97.7
to
109
97.7
to
102
101
to
135
Nic
kel,
tota
l
Med
ian
reco
very
, in
pe
rcen
t
99.1
101
102
104
101
111
Num
ber
of
dete
rmi
na
tions
3 4 4 5 3 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
3 4 4 5 3 4
Ran
ge
ofre
cove
ry,
in
perc
ent
95.8
to
108
97.4
to
114
76.5
to
91.6
80.3
to
115
78.2
to
96.3
82.2
to
109
Sele
nium
, dis
solv
ed
Med
ian
reco
very
, in
pe
rcen
t
99.4
104 79.8
104 83
.6
93.0
Num
ber
of
dete
rmi
na
tions
4 4 4 4 4 4
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
4 4 2 4 3 4
Tabl
e 18
. Rec
over
ies
in s
tand
ard
refe
renc
e w
ater
sam
ples
Con
tinue
d
01
si
Sele
nium
, tot
al
Ran
ge
ofSa
mpl
e re
cove
ry,
set
in
num
ber
perc
ent
1 90
.4 to
111
2 89
.8 to
118
3 75
.0 to
87.0
4 83
.7 t
o92
.1
5 78
.0 to
94.1
6 81
.6 to
89.2
Med
ian
reco
very
, in
pe
rcen
t
98.7
103 81
.8
90.2
81.8
88.1
Num
ber
of
dete
rmi
na
tions
4 4 4 4 4 4
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
4 4 2 4 2 4
Ran
ge
ofre
cove
ry,
in
perc
ent
97.7
to10
2
73.3
to10
6
102
to11
3
98.5
to
106
101
to11
1
92.5
to
102
Silv
er, d
isso
lved
Med
ian
reco
very
, in
pe
rcen
t
99.6
103
104
103
107 97
.4
Num
ber
of
dete
rmi
na
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
5 4 5 5 5 5
Ran
ge
ofre
cove
ry,
in
perc
ent
42.5
to10
2
47.5
to
106
35.0
to10
4
76.0
to12
5
74.7
to99
.2
74.7
to96
.6
Silv
er, t
otal
Med
ian
reco
very
, in
pe
rcen
t
62.5
102 70
.8
88.5
76.4
83.3
Num
ber
of
dete
rmi
na
tions
3 3 4 3 3 3
Num
ber
of
dete
rmi
na
tions
ha
ving
reco
veri
esw
ithin
10
0±20
%of
the
expe
cted
va
lue
1 2 2 1 1 2
Tabl
e 18
.-R
ecov
erie
s in
sta
ndar
d re
fere
nce
wat
er s
ampl
es-C
oncl
uded
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Sam
ple
set
num
ber
1 2 3 4 5 6
Ran
geof
reco
very
,in
perc
ent
93.5
to
105
97.0
to10
1
97.0
to10
3
93 .5
to
96.1
96.1
to
98.7
93.5
to
100
Ura
nium
,
Med
ian
reco
very
,in
perc
ent
96.1
101
100 94.8
96.5
97.4
diss
olve
d
Num
ber
ofde
term
ina
tions
3 3 3 3 3 3
Zin
c, d
isso
lved
Num
ber
of
dete
rmi
na
tions
ha
ving
re
cove
ries
with
in10
0±20
%of
the
expe
cted
valu
e
3 3 3 3 3 3
Ran
geof
reco
very
,in
perc
ent
88.2
to
96.1
93.8
to10
4
90.2
to10
5
99.8
to11
0
101
to10
7
102
to10
8
Med
ian
reco
very
,in
perc
ent
93.6
98.7
97.1
104
103
107
Num
ber
ofde
term
ina
tions
5 5 5 5 5 5
Num
ber
of
dete
rmi
na
tions
ha
ving
re
cove
ries
with
in10
0±20
%of
the
expe
cted
valu
e
5 5 5 5 5 5
Ran
geof
reco
very
,in
perc
ent
100
to11
0
66.7
to
117
98.1
to
113
101
to11
1
99.0
to10
6
94.3
to
101
Zin
c,
Med
ian
reco
very
,in
perc
ent
101 82
.8
107
108
104
100
, tot
al
Num
ber
ofde
term
ina
tions
5 5 3 3 4 3
Num
ber
of
dete
rmi
na
tions
ha
ving
re
cove
ries
with
in10
0±20
%of
the
expe
cted
valu
e
5 3 3 3 4 3