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 Chief

U.S. Geological Survey

Water Resources Division

4501 Indian School Road NE, Suite 200

Albuquerque, 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

Page

Abstract.................................................................................................................................................................................. 1

Introduction ................................................................................................................................................................^ 1

Purpose and scope ....................................................................................................................................................... 1

Study area..........................................................................^ 1

Previous investigations................................................................................................................................................ 3

Sampling and analysis methods and protocols............................................................................................................ 3

Water-quality data.................................................................................................................................................................. 3

Quality control.........................................................................................................................................................^ 4

References cited..................................................................................................................................................................... 5

FIGURE

1. Map showing sampling locations..................................................................................................................................... 2

TABLES

1. Method detection limits for, minimum reporting levels for, and references documenting laboratory analytical

methods used in this study......................................................................................................................................... 6

2. Analytical results on environmental samples collected from the Rio Grande at Picacho Bridge near

LasCruces, 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............ 16

6. Analytical results on split samples collected at the City of Las Cruces wastewater-treatment plant............................. 20

7. Analytical results on ambient blanks collected at the City of Las Cruces wastewater-treatment plant......................... 23

8. Analytical results on environmental samples collected from the Rio Grande at Calle del Norte Bridge near

Mesilla, New Mexico ................................................................................................................................................ 25

9. Analytical results on replicate samples collected from the Rio Grande at Calle del Norte Bridge near

Mesilla, New Mexico ................................................................................................................................................ 29

10. Analytical results on ambient blanks collected from the Rio Grande at Calle del Norte Bridge near Mesilla,

New Mexico .............................................................................................................................................................. 31

11. Analytical results on equipment blanks.......................................................................................................................... 33

12. 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.................................................... 36

13. Absolute and relative differences between selected constituents in environmental and split samples collected

at the City of Las Cruces wastewater-treatment plant............................................................................................... 38

14. 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.............................................. 39

15. Spike recoveries in environmental samples collected at the City of Las Cruces wastewater-treatment plant............... 41

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........................................................................................ 45

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........................................................................................ 46

18. 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 wastewatertreatment 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 wastewatertreatment 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 wastewatertreatment 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 wastewatertreatment 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 wastewatertreatment 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 (organicfree 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 sampleprocessing 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 waterquality 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 qualitycontrol 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 automatedhydride 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 WaterResources 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 surfacewater 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 documenlevel 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 

documentation

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
Table 2.--Analytical results on environmental samples collected from the Rio Grand

Picacho Bridge near Las Cruces, New Mexico

[inst., instantaneous; jiS/cm, microsiemens per centimeter at 25 degrees Celsius (deg 

mg/L, milligrams per liter; (ig/L, micrograms per liter; unfltrd, unfiltered; <, less th

Date

Aug 1996

06. ..

07 ...

20. . .

21. ..

Oct

08. ..

09. ..

Dec

10. . .

11. ..

Feb 1997

11. ..

12. . .

27. ..

28. . .

Time

1250

1130

0845

1300

1225

1115

1210

1145

1230

1145

1315

1130

Discharge, 

inst. 

(cubic 

feet

per

second)

1,180

1,060

1, 140

1, 140

186

210

52

50

45

45

596

580

Specific 

conductance

(|iS/cm)

623

620

595

603

1,160

1,300

1,640

1,630

1,650

1,650

851

845

Oxygen , 

dissolved

(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 

(standard

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

Temperature

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, 

dissolved

(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, 

dissolved

(mg/L

as Ca)

42

41

35

39

83

100

110

110

120

110

58

56

Magnesium, 

dis - 

solved

(mg/L

as Mg)

11

11

9.5

10

18

20

24

23

24

24

14

13

Hardness, 

total 

(mg/L

as

CaCO3 )

150

150

130

140

280

330

370

370

400

370

200

190
Table 2.--Analytical results on environmental samples collected from the Rio Grand

Picacho Bridge near Las Cruces, New Mexico Continued

Date

Aug 1996

06...

07. ..

20. . .

21. . .

Oct

08.. .

09.. .

Dec

10. ..

11. . .

Feb 1997

11. . .

12. ..

27. ..

28. ..

Aluminum,

dissolved

(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

Aluminum,

total

recov -

erable

(ng/L

as Al)

1,500

1,800

2,600

1,700

1,400

970

70

50

80

80

1,100

1,100

Antimony, Antidis- 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 ChroBarium,

dissolved

(ng/L

as Ba)

72

70

62

68

138

164

113

112

124

121

65

64

lium, total Cadmium, water mium.

dis- recov- dis- unfltrd, dis

solved erable solved total 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

Chromium,

total

recoverable

(ng/L

as Cr)

<1

1

2

1

<1

<1

1

<1

<1

<1

<1

<1
Table 2. Analytical results on environmental samples collected from the Rio Gran

Picacho Bridge near Las Cruces, New Mexico Continued

Date

Aug 1996

06. ..

07. ..

20. . .

21. ..

Oct

08. . .

09. ..

Dec

10. . .

11. ..

Feb 1997

11. . .

12. ..

27. ..

28. . .

Cobalt, 

dissolved

(ng/L

as 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 Copper, 

recov- diserable solved

(ng/L (ng/L

as 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

<1

2

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, Mangatotal nese, 

recov- diserable solved

((.ig/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

Manganese, 

total 

recoverable

Mercury, 

Mercury, total 

dis- recov - 

solved erable

I/L (ng/L (ng/L (ng/L

Mn)

.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
Table 2.--Analytical results on environmental samples collected from the Rio Grand

Picacho Bridge near Las Cruces, New Mexico Concluded

Molybdenum, 

dissolved

/ . ._ /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

Molybdenum, 

total 

recov -

erable

as Mo)

4

4

5

5

7

6

7

7

7

6

6

5

Nickel, 

dissolved

(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

Nickel, 

total 

recov -

erable

as Ni)

3

2

3

2

2

2

2

1

<1

<1

2

2

Sele- Silver, Uranium 

nium, Sele- Silver, total natural, 

dis- nium, dis- recov- dissolved 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, 

dissolved

(Mg/ T 

as

4

2

2

2

4

2

6

5

14

6

4

3

' U

Zn)

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

Zinc, 

total 

recoverable

as Zn)

10

<10

<10

<10

<10

<10

<10

<10

10

<10

<10

<10
Table 3.--Analytical results on replicate samples collected from the Rio Grande at Pica

Las Cruces, New Mexico

[mg/L, milligrams per liter; deg C, degrees Celsius; ng/L, micrograms per liter; <, less tha

Date

Aug 1996

06. . .

20. . .

Oct

08. . .

Dec

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

Antimony, 

total

(ng/L

as Sb)

2

<1

<1

<1

<1

2

Carbon,

organic,

dissolved

(mg/L

as C)

3.3

3.3

3.3

3.1

2.6

3.9

Barium, 

dissolved 

(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

Beryllium, 

dissolved 

(ng/L

as Be)

<1 . 0

<1.0

<1.0

<1.0

<1. 0

<1.0

Calcium,

dissolved

(mg/L

as Ca)

42

36

83

110

120

58

Beryl - 

lium, 

total 

recoverable 

(ng/L

as Be)

<10

<10

<10

<10

<10

<10

Magne- Hardsium, ness,

dis- total

solved (mg/L

(mg/L as

as Mg) CaC03 )

11 150

9.8 130

18 280

24 370

25 400

14 200

Cadmium 

Cadmium, water 

dis- unfltrd, 

solved total 

((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

Solids,

residue

at 105

deg C,

total

(mg/L)

512

786

846

1,080

1,110

618

Chromium, 

dissolved 

(jig/L

as Cr)

<1 . 0

<1.0

2.0

<2.0

2.0

1.0

Aluminum,

dissolved

(ng/L

as Al)

20

8.0

6.0

5.0

4.0

4.0

Chromium, 

total 

recoverable 

(jig/L

as Cr)

1

1

1

<1

<1

1

Aluminum,

total

recoverable

(jig/L

as Al)

1,700

2, 000

1,500

60

80

1,200

Cobalt, 

dissolved 

(ng/L

as Co)

<1 . 0

<1. 0

<1.0

<1.0

<1 .0

<1.0

Antimony,

dissolved

(H"3/L

as Sb)

<1 . 0

1.0

<1 .0

<1 . 0

<1 .0

Cobalt, 

total 

recoverable

(ng/L

as Co)

1

<1

1

<1

<1

1
Table 3. Analytical results on replicate samples collected from the Rio Grande at Picac

Las Cruces, New Mexico Concluded

Manga -

Copper, Lead, Manga- nese, Mercury,

Copper, total Lead, total nese, total Mercury, total

dis- recov- dis- recov- dis- recov- dis- recovsolved 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

MolybMolyb- denum,

denum, total

dis- recov -

solved erable

(|jg/L (ng/L

as Mo) as Mo)

6.0 5

6.0 5

6.0 6

8.0 7

8.0 7

6.0 5

Nickel, Sele- Silver, Uranium Zinc, 

Nickel, total nium, Sele- Silver, total natural, Zinc, total 

dis- recov- dis- nium, dis- recov- dis- dis- recovsolved erable solved total 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.

Oct

08... 2.0 2 <1 <1 <1.0 <1 3.0 4.

Dec

10... 2.0 1 <1 <1 <1.0 <1 4.0 9.

Feb 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 <10

0 <10

0 <10

0 <10

0 <10
Table 4.--Analytical results on ambient blanks collected from the Rio Grande at Pic

near Las Cruces, New Mexico

[rng/L, milligrams per liter; |ig/L, micrograms per liter; <, less than; unfltrd, un

Date Time

Carbon, Magne- Aluorganic. Carbon, Calcium, slum, minum,

dis- organic, dis- dis- dissolved total solved solved solved

(mg/L (mg/L (mg/L (mg/L (ng/L

as C) as C) as Ca) as Mg) as Al)

Aluminum, 

total 

recoverable 

(ng/L 

as Al)

Antimony, 

dissolved 

(ng/L 

as Sb)

Antimony, 

total 

(ng/L 

as Sb)

Barium, 

dissolved 

(ng/L 

as Ba)

Aug 1996

20. . . 

Oct

09. .. 

Feb 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,

dissolved

(ng/L

as Be)

Beryl -

lium,

total

recoverable

(ng/L

as Be)

Cadmium,

dissolved

(ng/L

as Cd)

Cadmium

water

unfltrd.

total

(ng/L

as Cd)

Chromium,

dissolved

(ng/L

as Cr)

Chromium,

total

recov -

erable

(ng/L

as Cr)

Cobalt,

dissolved

(ng/L

as Co)

Cobalt,

total

recov -

erable

(ng/L

as Co)

Copper ,

dissolved

(ng/L

as Cu)

Aug 1996

20. . . 

Oct

09. .. 

Feb 1997

11. . .

28.. .
Table 4.--Analytical results on ambient blanks collected from the Rio Grande at Pica

near Las Cruces, New Mexico Concluded

Date

Aug 1996

20. . .

Oct

09. ..

Feb 1997

11. ..

28. ..

Copper ,

total Lead,

recov- diserable solved

<Hg/L (ng/L

as Cu) as Pb)

<1 <1.0

<1 <1.0

<1 <1 . 0

<1 <1.0

Lead,

total

recoverable

(ng/L

as Pb)

<1

<1

<1

<1

Manga -

nese,

dissolved

(ng/L

as Mn)

<1.0

<1.0

<1 . 0

<1.0

Manga -

nese, Mercury,

total Mercury, total

recov- dis- recoverable 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

Molybdenum,

dissolved

(ng/L

as Mo)

<1.0

<1.0

<1 . 0

<1.0

Molybdenum,

total

recoverable

(|ig/L

as Mo)

<1

<1

<1

<1

Date

Aug 1996

20. . .

Oct

09. . .

Feb 1997

11. . .

28. ..

Nickel, Sele- Silver, Uranium

Nickel, total nium, Sele- Silver, total natural. Zinc,

dis- recov- dis- nium, dis- recov- dis- dissolved erable solved total solved erable solved solved

(ng/L (ng/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

recoverable

as Zn)

<10

<10

<10

<10
Table 5.--Analytical results on environmental samples collected at the City of La

wastewater-treatment plant

[inst., instantaneous; juS/cm, microsiemens per centimeter at 25 degrees Celsius 

mg/L, milligrams per liter; jug/L, micrograms per liter; <, less than; unfltrd, unfiltere

Date Time

Aug 1996

06... 0950

07... 0950

20... 1100

21... 1130

Oct

08... 0935

09... 0945

Dec

10... 1030

11... 1030

Feb 1997

11... 1100

12... 1015

27... 1130

28... 0945

Discharge,

inst.

(cubic

feet

per

second)

15

15

16

17

18

17

16

16

14

14

15

14

Specific

conductance

(US/cm)

1,260

1,260

1,220

1,210

1,230

1,240

1,270

1,290

1,410

1,430

1,410

1,410

Oxygen,

dissolved

(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,

field

( s tand -

ard

units)

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

Carbon ,

organic,

dissolved

(mg/L

as C)

5.1

5.0

5.5

5.0

6.5

6.3

10

7.8

13

7.1

7.6

7.6

Carbon,

organic.

total

(mg/L

as C)

7.6

5.8

8.9

6.6

8.0

7.4

9.6

39

18

10

8.6

9.9

Calcium,

dissolved

(mg/L

as Ca)

72

72

70

71

71

73

81

78

95

93

95

93

Magnesium,

dissolved

(mg/L

as Mg)

18

18

18

18

18

17

18

17

21

21

21

21

Hardness,

total

(mg/L

as

CaCO3 )

250

250

250

250

250

250

280

260

320

320

320

320
Table 5. Analytical results on environmental samples collected at the City of La

wastewater-treatment plant Continued

Date

Aug 1996

06. ..

07. ..

20. . .

21. . .

Oct

08. ..

09. ..

Dec

10. ..

11. . .

Feb 1997

11. . .

12. ..

27. . .

28. . .

Solids,

residue

at 105

deg C,

total

(mg/L)

812

798

786

780

786

784

836

902

920

900

904

Aluminum,

dissolved

(jig/L

as Al)

17

15

13

13

14

11

11

12

9.0

9.0

8.0

8.0

Aluminum,

total

recoverable

(jig/L

as Al)

30

30

40

40

20

30

60

720

50

50

50

50

Anti -

mony, Antidis- mony,

solved total

((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 <1

1.0 1

1.0 <1

1.0 <1

1.0 <1

1.0 1

Barium,

disdolved

(ng/L

as Ba)

8.0

8.0

9.0

8.0

7.0

7.0

16

17

19

20

15

15

Beryl - 

Beryl- lium, Cadmium Chrolium, total Cadmium, water mium,

dis- recov- dis- unfltrd, dissolved erable solved 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
Table 5. Analytical results on environmental samples collected at the City of La

wastewater-treatment plant Continued

Chromium, Cobalt, 

total Cobalt, total Copper, 

recov- dis- recov- diserable solved erable solved

Copper, 

total 

recoverable

(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

<1

3

<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 - 

Lead, total nese, 

dis- recov- dissolved erable solved

(ng/L (^ig/L (ng/L

as 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 - 

erable

(|ig/L

as Mn)

50

40

50

40

60

60

40

70

60

60

50

80

Mercury, 

Mercury, total 

dis- tecovsolved erable

(|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
Table 5.-Analytical results on environmental samples collected at the City of La

wastewater-treatment plant Concluded

Date

Aug 1996

06.. .

07...

20. . .

21. . .

Oct

08.. .

09...

Dec

10.. .

11. . .

Feb 1997

11. . .

12. ..

27. . .

28. . .

Molybdenum, 

dissolved

(Hg/L

as Mo)

27

28

31

31

20

20

22

18

28

42

30

31

Molybdenum , 

total 

recoverable

(ug/L

as Mo)

23

23

27

27

18

16

19

16

27

40

27

27

Nickel, 

dissolved

(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

Nickel, Seletotal nium, Sele- Silver, 

recov- dis- nium, diserable solved total solved

(ug/L (ug/L (ug/L (ug/L

as Ni) as Se) as Se) as Ag)

2 <1 <1 <1.0

1 <1 <1 <1.0

2 <1 <1 <1.0

1 <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

Silver, Uranium 

total natural, 

recov- diserable 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, 

dissolved

(ug/L

as Zn)

18

16

16

14

15

11

25

46

31

40

24

24

Zinc, 

total 

recov - 

erable

(Hg/L

as Zn)

30

20

<10

10

20

10

30

100

30

30

30

20
Table 6. Analytical results on split samples collected at the City of Las Cru

wastewater-treatment plant

[mg/L, milligrams per liter; (ig/L, micrograms per liter; <, less than; unfltrd, un

Carbon , 

organic, 

dissolved

(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

10

7

13

7

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

9

39

18

10

8

9

C)

,6

.8

.9

.6

.0

.4

.6

.6

.9

Aluminum, 

dissolved

(ng/L

as Al)

17

15

13

13

14

11

11

12

9.0

9.0

8.0

8.0

Aluminum, 

total 

recov - 

erable

(ng/L

as Al)

30

30

40

40

20

30

60

720

50

50

50

50

Antimony, 

dissolved

(ng/L

as 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, distotal solved

(ng/L (ng/L

as Sb) as

<1 8.

<1 8.

<1 9.

<1 8,

<1 7.

<1 7.

<1 16

1 17

<1 19

<1 20

<1 15

1 15

Ba)

.0

.0

.0

.0

.0

.0

Beryllium, 

dissolved

(ng/L

as 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, Cad

total Cadmium, wa

recov- dis- unf

erable solved to

(ng/L (ng/L (n

as Be) as Cd) as 

<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 
Table 6.~Analytical results on split samples collected at the City of Las Cruc

wastewater-treatment plant Continued

ChroChro- mium, 

mium, total Cobalt, 

dis- recov- dissolved 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- recoverable 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

3

56

3

2

5

3

Lead, 

dissolved 

(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- diserable solved 

<Hg/L (|ag/L 

as Pb) as Mn)

<1 32

<1 30

<1 39

<1 35

<1 55

<1 51

<1 31

8 37

<1 47

<1 51

1 45

<1 78

Manga - 

nese, 

total 

recoverable

(ng/L

as Mn)

50

40

50

40

50

50

40

70

60

40

50

80

Mercury, 

dissolved 

(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

Merc

tot

rec

era

(ng

as 

<0 .

<0.

<0.

<0.

<0.

<0.

<0.

<0.

<0,

<0,

<0,

<0
Table 6.--Analytical results on split samples collected at the City of Las Cru

wastewater-treatment plant Concluded

Molybdenum,

dissolved

(ug/L

Date as Mo)

Aug 1996

06... 27

07... 28

20. . . 31

21. . . 31

Oct

08... 20

09... 20

Dec

10... 22

11... 18

Feb 1997

11... 28

12... 42

27. . . 30

28... 31

Molybdenum,

total

recoverable

(ug/L

as Mo)

23

23

27

27

18

16

19

16

27

40

27

27

Nickel,

dissolved

(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,

total

recov -

erable

(ug/L

as Ni)

2

1

5

1

2

2

2

3

2

2

2

2

Selenium,

dissolved

(ug/L

as Se)

<1

<1

<1

<1

<1

<1

1

1

1

1

1

1

Selenium,

total

(ug/L

as Se)

<1

<1

<1

<1

<1

<1

1

1

1

1

1

1

Silver, Uranium

Silver, total natural.

dis- recov- dissolved 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/L

as Zn)

18

16

16

14

15

11

25

46

31

40

24

24

Zinc,

total

recoverable

(ug/L

as Zn)

20

20

10

10

20

10

30

100

30

30

30

20
Table 7.~Analytical results on ambient blanks collected at the City of Las Cruces wastewat

[mg/L, milligrams per liter; jug/L, micrograms per liter; <, less than; unfltrd, un

Date

Aug 1996

06...

21. . .

Dec

10.. .

Feb 1997

12. ..

Time

0953

1132

1032

1017

Carbon,

organic,

dissolved

(mg/L

as C)

<0.10

<0.10

<0.10

<0.10

Carbon,

organic,

total

(mg/L

as C)

<0.10

<0.10

0.30

0.40

Calcium,

dissolved

(mg/L

as Ca)

<0.02

<0.02

<0.02

0.02

Magnesium,

dissolved

(mg/L

as Mg)

<0.01

<0.01

<0.01

<0.01

Aluminum,

dissolved

(ng/L

as Al)

3.0

3.0

6.0

3.0

Aluminum,

total

recoverable

(ug/L

as Al)

<10

<10

<10

<10

Antimony,

dissolved

(Mg/L

as Sb)

<1.0

1.0

<1.0

<1.0

Antimony,

total

(^g/L

as Sb)

<1

<1

<1

<1

Barium,

dissolved

(ng/L

as Ba)

<1.0

<1.0

<1.0

<1.0

Date

Aug 1996

06...

21...

Dec

10...

Feb 1997

12...

Beryl -

lium,

dissolved

(ng/L

as Be)

<1.0

<1.0

<1.0

<1.0

Beryl -

lium.

total

recoverable

(ng/L

as Be)

<10

<10

<10

<10

Cadmium,

dissolved

(ng/L

as Cd)

<1.0

<1.0

<1.0

<1.0

Cadmium

water

unfltrd,

total

(ng/L

as Cd)

<1

<1

<1

<1

Chromium,

dissolved

fug/las Cr)

<1 .0

<1.0

<1.0

<1.0

Chromium,

total Cobalt,

recov- diserable solved

(ng/L (ng/L

as Cr) as Co)

<1 <1. 0

<1 <1.0

<1 <1.0

<1 <1.0

Cobalt,

total Copper,

recov- diserable solved

(ug/L (ug/L

as Co) as Cu)

<1 <1.0

<1 <1.0

<1 <1.0

<1 <1.0
Table 7.--Analytical results on ambient blanks collected at the City of Las Cruces wastewater-trea

Date

Aug 1996

06. . .

21. . .

Dec

10. . .

Feb 1997

12. ..

Copper, Lead, Manga -

total Lead, total nese,

recov- dis- recov- diserable solved erable solved

(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

Manga -

nese,

total Mercury,

recov- diserable solved

(ug/L (ug/L

as Mn) as Hg)

<10 <0.1

<10 <0.1

<10 <0.1

<10 <0.1

Mercury,

total

recov -

erable

(Ug/L

as Hg)

<0.10

<0.10

<0.10

<0.10

Molybdenum ,

dissolved

(ug/L

as Mo)

<1. 0

<1.0

<1.0

<1 . 0

Molybdenum ,

total

recoverable

(ug/L

as Mo)

<1

<1

<1

<1

Date

Aug 1996

06. ..

21. . .

Dec

10.. .

Feb 1997

12. ..

Nickel, Sele- Silver, Uranium

Nickel, total nium, Sele- Silver, total natural, Zinc,

dis- recov- dis- nium, dis- recov- dis- dissolved erable solved total 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

recoverable

(Ug/L

as Zn)

<10

<10

<10

<10
Table 8.--Analytical results on environmental samples collected from the Rio Grande at Cal

near Mesilla, New Mexico

[|xS/cm, microsiemens per centimeter at 25 degrees Celsius (deg C); mg/L, milligra

, micrograms per liter; <, less than; unfltrd, unfiltered]

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

Discharge, 

inst . 

(cubic 

feet

per

second)

1,120

1,290

1,680

1,630

172

154

48

48

45

43

563

530

Specific 

con - Oxygen , 

duct- disance

(US/cm)

623

611

595

610

1,190

1,240

1,600

1,620

1,650

1,650

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 

(standard

units)

8.3

8.2

8.1

8.3

8.2

8.4

8.3

8.4

8.4

8.4

8.5

8.5

Carbon, 

organic, 

Temper- disature 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, 

dissolved

(mg/L

as Ca)

42

40

36

38

83

93

110

100

110

110

57

58

Magne - 

sium, 

dissolved

(mg/L

as Mg)

11

10

9.5

10

18

20

23

22

23

24

13

14

Hardness, 

total 

(mg/L

as

CaCO3 )

150

140

130

140

280

310

370

340

370

370

200

20
Table 8.--Analytical results on environmental samples collected from the Rio Grande at Ca

near Mesilla, New Mexico Continued

10

o>

Date

Aug 1996

06. . .

07. ..

20. . .

21. . .

Oct

08. . .

09. ..

Dec

10. . .

11. . .

Feb 1997

11. . .

12. ..

27. ..

28. ..

Solids, 

residue 

at 105 

deg C,

total

(mg/L)

546

628

678

692

826

884

1,060

1,070

1,090

1,080

614

614

Aluminum, 

dissolved

(Me

as

25

21

6

5

5

5

7

6

5

4

6

4

J/L

Al)

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

Aluminum, 

total 

recoverable

<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, Anti- Barium, lium, 

dis- mony, dis- dissolved total 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

Beryllium, Cadmium Chrototal Cadmium, water mium, 

recov- dis- unfltrd, diserable 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

<10 <1 . 0 <1 1

<10 <1 . 0 <1 1

Cr)

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0
Table 8.--Analytical results on environmental samples collected from the Rio Grande at Ca

near Mesilla, New Mexico Continued

Chromium, Cobalt, 

total Cobalt, total Copper, 

recov- dis- recov- diserable solved erable solved

Date

Aug 1996

06. ..

07...

20...

21. ..

Oct

08...

09. ..

Dec

10. . .

11. . .

Feb 1997

11. . .

12. ..

27.. .

28. . .

(ng/L (ng/L (ng/ L (M<

as Cr) as Co) as Co) as

1 <1.0 <1 6

1 <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 <1

1 <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 , 

total Lead, 

recov- diserable solved

(Mg/L (ng/L

as 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, 

total 

recoverable

(M9/L

as Pb)

2

2

4

2

<1

<1

<1

<1

<1

<1

2

2

Manga - 

nese, 

dissolved

(ng

as

<1

<1

1

<1

1

1

11

10

10

9

2

1

7L

Mn)

. 0

.0

.0

.0

.0

.0

.0

.0

.0

Manga - 

nese, 

total 

recoverable

(ng/ L

as Mn)

220

180

230

170

30

30

20

20

20

30

150

160

Mercury, 

Mercury, total 

dis- 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
Table 8.--Analytical results on environmental samples collected from the Rio Grande at Ca

near Mesilla, New Mexico Concluded

Date

Aug 1996

06. . .

07. . .

20. . .

21. ..

Oct

08.. .

09. ..

Dec

10. . .

11. . .

Feb 1997

11. . .

12. . .

27. ..

28. . .

Molybdenum, 

dissolved

(ng/L

as Mo)

6.0

6.0

6.0

6.0

7.0

8.0

9.0

9.0

10

12

6.0

7.0

Molybdenum, 

total 

recoverable

Nickel, 

dis - 

solved

(ng/L (ng/L

as Mo)

4

4

4

4

7

7

8

8

9

10

6

6

as

2,

2.

2.

2

2

2,

2

2

1

1

<1

1

Ni)

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

Nickel, 

total 

recov - 

erable

(^g/L

as Ni)

2

3

6

2

2

2

<1

1

1

1

2

2

Selenium, Sele- Silver, 

dis- nium, dissolved total 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 

total natural, 

recov- diserable 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, 

dissolved

(ng

as

6.

6.

8.

6.

5.

<1,

7.

6,

6,

6.

10

5

/L

Zn)

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

Zinc, 

total 

recoverable

(ng/L

as Zn)

20

20

20

<10

<10

<10

<10

<10

<10

<10

<10

<10
Table 9.--Analytical results on replicate samples collected from the Rio Grande at Calle 

near Mesilla, New Mexico

[mg/L, milligrams per liter; deg C, degrees Celsius; |ug/L, micrograms per liter; <, less than

Date

Aug 1996

07. ..

21.. .

Oct

09. ..

Dec

11. . .

Feb 1997

11. ..

27. ..

Date

Aug 1996

07...

21. ..

Oct

09.. . Dec

11. ..

Feb 1997

11. . .

27. ..

Time

0840

0930

0850

0850

0945

1005

Antimony, 

total

as Sb)

2

<1

<1

<1

<1

1

Carbon,

organic,

dissolved

(mg/L

as C)

3.5

3.4

3.4

3.5

3.3

3.9

Barium, 

dissolved 

(Mg/L 

as Ba)

70

66

148

101

115

63

Carbon,

organic,

total

(mg/L

as C)

5.9

6.2

3.9

5.3

3.8

6.9

Beryllium, 

dissolved

(Mg/L

as 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

Beryllium, 

total 

recoverable

as Be)

<10

<10

<10

<10

<10

<10

Magne- Hardsium, ness

dis- total

solved (mg/L

(mg/L as

as Mg) CaC03 )

11 150

10 140

20 320

24 370

25 400

14 210

Cadmium 

Cadmium, water 

dis- unfltrd, 

solved total 

(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

1,070

1,080

610

Chromium, 

dissolved 

(fig/L 

as Cr)

2.0

2.0

3.0

1.0

2.0

1.0

AluAlu- minum, Antiminum, total mony,

dis- recov- dissolved erable solved

(ug/L (ug/L (ug/L

as Al) as Al) as Sb)

18 1,800 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 1,100 <1.0

Chromium, Cobalt, 

total Cobalt, total 

recov- dis- recoverable solved erable

as Cr) as Co) as Co)

3 <1.0 <1

2 <1.0 1

<1 <1.0 <1

<1 <1.0 <1

<1 <1.0 <1

<1 <1.0 1
Table 9.--Analytical results on replicate samples collected from the Rio Grande at Calle 

near Mesilla, New Mexico Concluded

Copper,

dissolved

(ng/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

recoverable

(Mg/L

as Cu)

2

2

<1

1

<1

2

Lead,

Lead, total

dis- 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

Manga -

nese,

dissolved

(Mg/L

as Mn)

<1 . 0

<1 .0

1.0

11

10

2.0

Manganese,

total Mercury,

recov- diserable 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

Mercury,

total

recoverable

(Mg/L

as Hg)

<0.10

<0.10

<0.10

<0.10

<0.10

<0.10

Molybdenum,

dissolved

(M9/L

as Mo)

7.0

6.0

8.0

9.0

11

7.0

Molybdenum ,

total

recoverable

(ng/L

as Mo)

4

4

7

8

9

5

Date

Aug 1996

07. ..

21. . .

Oct

09...

Dec

11. . .

Feb 1997

11.. .

27. ..

Nickel,

dissolved

(Hg/L

as Ni)

1.0

2.0

2.0

2.0

1.0

<1.0

Nickel, Seletotal nium, Selerecov- 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 <1

2 <1 <1

Silver, Uranium

Silver, total natural.

dis- recov- dissolved erable solved

(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, total

dis- recov -

solved erable

(ng/L (ng/L

as Zn) as Zn)

7.0 50

4.0 <10

3.0 <10

5.0 <10

12 10

2.0 <10
Table 10.--Analytical results on ambient blanks collected from the Rio Grande at Calle d

near Mesilla, New Mexico

[mg/L, milligrams per liter; ng/L, micrograms per liter; <, less than; unfltrd, un

Date

Aug 1996

07. . .

Oct

08. . .

Dec

11. ..

Feb 1997

27. . .

Date

Aug 1996

07. ..

Oct

08. ..

Dec

11. ..

Feb 1997

27. . .

AluCarbon, Magne- Alu- minum, Anti - 

organic, Carbon, Calcium, sium, minum, total mony, Anti- Barium, 

dis- organic, dis- dis- dis- recov- dis- mony, dissolved 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/L

Time 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- ChroBeryl- lium, Cadmium Chro- mium, Cobalt, 

lium, total Cadmium, water mium, total Cobalt, total Copper, 

dis- recov- dis- unfltrd, dis- recov- dis- recov- dissolved 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
Table 10. Analytical results on ambient blanks collected from the Rio Grande at Calle d

near Mesilla, New Mexico Concluded

Date

Aug 1996

07. ..

Oct

08. . .

Dec

11. . .

Feb 1997

27. ..

Date

Aug 1996

07. ..

Oct

08. . .

Dec

11. . .

Feb 1997

27. ..

Manga -

Copper, Lead, Manga- nese, Mercury,

total Lead, total nese, total Mercury, total

recov- dis- recov- dis- recov- dis- recoverable 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- Silver, Uranium 

Nickel, total nium, Sele- Silver, total natural, 

dis- recov- dis- nium, dis- recov- dissolved 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

Molybdenum,

total

recoverable

(ng/L

as Mo)

<1

<1

<1

Zinc, 

total 

recoverable

as Zn)

<10

<10

<10

<10
Table 11.~Analytical results on equipment blanks 

[mg/L, milligrams per liter; ug/L, micrograms per liter; <, less than; unfltrd, unf

Carbon, 

organic, 

dissolved

(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, 

dissolved

(mg/L

as

<0 .

<0

<0

<0

<0

0

<0

<0

<0

0

0

<0

Ca)

.02

.02

.02

.02

.02

.05

.02

.02

.02

.02

.05

.02

Magne - 

sium, 

dissolved

(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

AluAlu- minum, 

minum, total 

dis- recovsolved 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, Antidi 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, 

dissolved

(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- recovsolved 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

Cadmi

di

sol

(Mg

as 

<1

<1

<1

<1

<1

<1

<1

<1

<1

<1

<1

<1
Table 11.-Analytical results on equipment blanks Continued

Cadmium

water

unf Itrd,

total

<ng/L

Date as Cd)

Aug 1996

06... <1

07... <1

20... <1

21... <1

Oct

08... <1

09... <1

Dec

10. . . <1

11. . . <1

Feb 1997

11... <1

12. .. <1

27... <1

28... <1

ChroChro- mium.

mium, total Cobalt,

dis- recov- dissolved erable solved

(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

Cobalt, Copper,

total Copper, total

recov- dis- recoverable solved erable

(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,

dissolved

(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

recov- dis- recov- di

erable solved erable sol

(ng/L (ng/L (ng/L (ng

as Pb) as Mn) as Mn) as 

<1 <1 . 0 <10 <0 

<1 <1 . 0 <10 <0 

<1 <1 . 0 <10 <0 

<1 <1 . 0 <10 <0 

<1 <1.0 <10 <0

<1 <1 . 0 <10 <0 

<1 <1. 0 <10 <0 

<1 <1 . 0 <10 <0. 

<1 <1.0 <10 <0

<1 <1 . 0 <10 <0 

<1 <1.0 <10 <0

<1 <1.0 <10 <0
Table 11. Analytical results on equipment blanks Concluded

Mercury, Molybtotal denum, 

recov- diserable solved

(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

Molybdenum, 

total Nickel, 

recov- diserable 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

Nickel, Sele- Silver, 

total nium, Sele- Silver, total 

recov- dis- nium, dis- recoverable solved total 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

Uranium 

natural, 

dissolved

(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, tota

dis- rec

solved erab

(ug/L (ug/

as Zn) as 

2.

2,

9.

4.

<1.

11

5

6,

3

8

15

2

,0 

. 0 <

. 0 <

.0 <

.0 <

<

. 0 <

. 0 <

. 0 <

. 0 <

<

. 0 <
Table 12.--Absolute and relative differences between selected constituents in environmental and 

collected from the Rio Grande at Picacho Bridge near Las Cruces, New Mexico

[E, concentration of constituent in environmental sample; R, concentration of constituent in re

%, percent; mg/L, milligrams per liter; BRL, E and/or R less than the minimum reportin

Dissolved solids

Date

August 

6, 1996

August 

20, 1996

October 

8, 1996

December 10, 

1996

February 12, 

1997

February 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

Organic carbon, dissolved

(E-R), J&R1 x 100% 

in mg/L (E+R)/2

0.1 3

0 0

0 0

0 0

0.1 4

-0.2 5

Organic carbon, total

(E-R), 

in mg/L

-0.8

0.6

-0.3

-0.4

-1.1

-0.7

1E=E1 x 100% 

(E+R)/2

7

10

7

10

25

10

Calcium, dissolved

(E-R), 

in mg/L

0

-1

0

0

-10

-1

1E=&1 x 10

(E+R)/2

0

3

0

0

8.7

2
Table 12.-Absolute and relative differences between selected constituents in environmental and 

collected from the Rio Grande at Picacho Bridge near Las Cruces, New Mexico Con

Barium, dissolved Chromium, dissolved Chromium, total Aluminum, dissolved 

(E-R), lEzRL xlOQo/o (E-R), 1E.RJ x 100o/0 (E-R), JirRL x 100% (E-R)> M x 10

Date inmg/L (E+R)/2 inmg/L (E+R)/2 inmg/L (E+R)/2 inmg/L (E+R)/2 

August - 1 

6, 1996

August -4 

20, 1996

October 0 

8, 1996

Decem- -4 

her 10, 

1996

Febru- -7 

ary 12, 

1997

Febru- -4 

ary 28, 

1997

1 0 0 BRL BRL -1 5 

6 BRL BRL 1 30 2 20 

000 BRL BRL -1 20 

300 00 00 

600 BRL BRL 1 20 

600 BRL BRL 0 0 
Table 13. Absolute and relative differences between selected constituents in environmental a

collected at the City of Las Cruces wastewater-treatment plant

[E, concentration of constituent in environmental sample; S, concentration of constituent in 

ug/L, micrograms per liter; BRL, E and/or S less than the minimum reporting le

Chromium, dissolved

Date

August 6, 

1996

August 7, 

1996

August 20, 

1996

August 21, 

1996

October 8, 

1996

October 9, 

1996

December 

10, 1996

December 

11,1996

February 

11,1997

February 

12, 1997

February 

27, 1997

February 

28, 1997

(E-S), 

in|ng/L

0

0

0

0

0

0

BRL

0

0

0

0

0

JE=Sl x 100% 

(E+S)/2

0

0

0

0

0

0

BRL

0

0

0

0

0

Manganese, dissolved

(E-S), 

in|ng/L

0

0

0

0

0

0

0

0

0

0

0

1

1E=S1 x 100% 

(E+S)/2

0

0

0

0

0

0

0

0

0

0

0

1

Manganese, total

(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

Nickel, dissolved

(E-S), 

in|ng/L

0

0

BRL

0

0

0

0

0

0

0

0

0

^=81 x 

(E+S)/2

0

0

BRL

0

0

0

0

0

0

0

0

0
Table 14.-Absolute and relative differences between selected constituents in environmental and re

collected from the Rio Grande at Calle del Norte Bridge near Mesilla, New Mexico

[E, concentration of constituent in environmental sample; R, concentration of constituent in repl

mg/L, milligrams per liter; |Lig/L, micrograms per liter; BRL, E and/or R less than the minimum re

Dissolved solids

(E-R), 

Date in mg/L

August 7, 94

1996

August 262

21,1996

October -6

9, 1996

<° Decem- 0

her 11,

1996

February 10

11,1997

February 4

27, 1997

J^=£l x 100% 

(E+R)/2

16

46.7

0.7

0

0.9

0.7

Organic carbon, dissolved

(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

Organic carbon, total

(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

Calcium, dissolved

(E-R), 

in mg/L

-1

0

-1

-10

-10

-2

lE^Sl x 100%

(E+R)/2

2

0

1

10

9

3

Magnesium, di

(E-R), 

in mg/L

-1

0

0

-2

-2

-1

JE^l 

(E+R
Table 14.--Absolute and relative differences between selected constituents in environmental and repli

from the Rio Grande at Calle del Norte Bridge near Mesilla, New Mexico Concluded

Chromium, dissolved

Date

August 7, 

1996

August 

21, 1996

October 

9, 1996

December 11, 

1996

February 

11, 1997

February 

27, 1997

(E-R),

0

-1

0

0

0

0

JE^ x 100% 

(E+R)/2

0

67

0

0

0

0

Chromium, total

(E-R), lErRJ x 100o/o 

in ng/L (E+R)/2

-2 100

0 0

BRL BRL

BRL BRL

BRL BRL

BRL BRL

Aluminum, dissolved

(E-R),

3

-1

0

2

1

2

JE=£1 x 100% 

(E+R)/2

15

20

0

40

20

40

Aluminum, total

(E-R), 

in Mg/L

100

-200

90

-310

0

0

lEiSl x 100% 

(E+R)/2

5

8

9.4

150

0

0

U

(E-R

0

0

-1

-1

0
Table 15. Spike recoveries in environmental samples collected at the City of Las Cruces wastew

[All values are percentages]

Sampling 

date

August 6, 

1996

August 7, 

1996

August 20, 

1996

August 2 1 , 

1996

October 8, 

1996

October 9, 

1996

December 

10, 1996

December 

11,1996

February 11, 

1997

February 12, 

1997

February 27, 

1997

February 28, 

1997

Carbon, 

dissolved

99

99

100

96

106

104

95

96

85

102

102

97

Organic 

carbon, total

102

92

104

116

100

103

88

160

100

80

97

106

Barium, 

dissolved

107

103

106

104

103

99

101

97

101

99

102

104

Aluminum, 

dissolved

98

92

84

85

90

88

97

103

92

92

95

95

Aluminum, 

total

109

105

108

109

93

88

98

107

109

100

89

97

Antimony, 

dissolved

113

113

112

110

100

99

101

100

99

99

102

102
Table 15.-Spike recoveries in environmental samples collected at the City of Las Cruces wastewater-trea

Sampling 

date

August 6, 

1996

August 7, 

1996

August 20, 

1996

August 2 1 , 

1996

October 8, 

1996

October 9, 

1996

December 

10, 1996

December 

11, 1996

February 11, 

1997

February 12, 

1997

February 27, 

1997

February 28, 

1997

Beryllium, 

total

97

101

94

102

96

94

93

95

88

96

88

95

Cadmium, 

dissolved

98

98

101

97

99

97

97

98

97

97

96

97

Cadmium, 

total

99

102

96

108

104

106

97

95

108

106

106

106

Chromium, 

dissolved

90

90

94

94

92

92

95

99

90

91

92

93

Chromium, 

total

90

194

111

109

102

101

100

103

102

103

106

103

Cobalt, 

dissolved

91

90

97

95

94

94

95

99

94

93

95

96

C
Table 15. Spike recoveries in environmental samples collected at the City of Las Cruces wastewater-tre

Sampling 

date

August 6, 

1996

August 7, 

1996

August 20, 

1996

August 21, 

1996

October 8, 

1996

October 9, 

1996

December

10, 1996

December

11,1996

February 11, 

1997

February 12, 

1997

February 27, 

1997

February 28, 

1997

Copper, 

total

104

112

94

95

102

101

91

109

103

97

89

98

Lead, 

dissolved

103

102

104

103

101

101

99

98

97

96

95

95

Lead, total

101

102

94

103

103

105

101

92

98

99

101

98

Manganese, 

dissolved

92

92

96

94

95

97

96

98

91

91

95

95

Manganese, 

total

92

98

90

97

88

91

96

96

90

117

94

84

Mercury, 

dissolved

105

103

103

94

111

92

103

100

113

110

103

101

Mercury, 

total

108

98

93

95

94

97

99

105

101

101

84

87
Table 15. Spike recoveries in environmental samples collected at the City of Las Cruces wastewater-tr

Sampling 

date

August 6, 

1996

August 7, 

1996

August 20, 

1996

August 2 1 , 

1996

October 8, 

1996

October 9, 

1996

December 

10, 1996

December 

11, 1996

February 1 1 , 

1997

February 12, 

1997

February 27, 

1997

February 28, 

1997

Nickel, 

dissolved

86

90

94

94

95

89

90

100

91

88

89

89

Nickel, 

total

108

260

69

104

105

100

99

98

99

98

106

105

Selenium, 

dissolved

120

95

100

99

86

81

89

97

95

97

118

93

Selenium, 

total

108

103

104

117

81

92

90

98

103

105

105

110

Silver, 

dissolved

92

90

94

93

93

93

87

90

94

93

90

91

Silver, total

104

114

100

100

90

90

92

94

98

96

92

94

Uranium, 

dissolved

95

99

101

101

98

100

94

94

95

92

98

98
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

Minimum

reporting 

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

minimum

reporting 

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

Minimum

reporting 

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

minimum

reporting 

level

12

8

3

8

5

1

1

11

1

46
Table 18. Recoveries in standard reference water samples 

[*, no range available; %, percent]

Organic carbon, dissolved

Range 

of

Sample recovery, 

set in 

number percent

1 *

2 *

3 *

4 *

5 *

6 *

Median

recovery, 

in 

percent

99.4

102

101

99.0

98.0

102

Number

of 

determinations

1

1

1

1

1

1

Number 

of 

determinations 

having

recoveries

within 

100+20%

of the 

expected 

value

1

1

1

1

1

1

Range 

of

recovery, 

in 

percent

95.5 to

102

96.0 to

105

97.0 to

100

98.0 to

98.0

*

*

Organic carbon, total

Median

recovery, 

in 

percent

98.3

98.0

98.0

98.0

98.0

100

Number

of 

determinations

3

3

3

2

1

1

Number 

of 

determinations 

having

recoveries

within 

100+20%

of the 

expected 

value

3

3

3

2

1

1

Range 

of

recovery, 

in 

percent

100 to

102

97.8 to

102

98.7 to

103

97.6 to

103

101 to

103

101 to

104
Table 18.-Recoveries in standard reference water samples Continued

Magnesium, dissolved

Range 

of

Sample recovery, 

set in 

number percent

1 101 to

104

2 97.9 to

103

3 98.5 to

103

4 98.8 to

101

5 101 to

102

6 100 to

103

Median

recovery, 

in 

percent

104

102

101

99.9

102

101

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

5

5

5

5

5

Range 

of

recovery, 

in 

percent

96.0 to

114

93.0 to

97.5

92.0 to

103

98.5 to

116

69.5 to

101

78.5 to

102

Aluminum, dissolved

Median

recovery, 

in 

percent

102

95.1

101

104

91.0

101

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

5

5

5

4

4

Range 

of

recovery, 

in 

percent

100 to

117

91.1 to

124

83.5 to

113

87.1 to

117

88.5 to

107

96.5 to

110
Table 18. Recoveries in standard reference water samples Continued

Antimony, dissolved

Range 

of 

Sample recovery, 

set in 

number percent

109 to 

119

106 to 

116

98.7 to 

107

80.3 to 

116

99.8 to 

102

100 to 

6 106

Median 

recovery, 

in 

percent

111

109

101

104

100

103

Number 

of 

determinations

3

3

3

4

3

3

Number 

of 

determinations 

having

recoveries

within 

100±20% 

of the 

expected 

value

3

3

3

4

3

3

Range 

of 

recovery, 

in 

percent

112 to 

121

68.1 to 

120

82.0 to 

113

104 to 

139

110 to 

112

100 to 

128

Antimony, total

Median 

recovery, 

in 

percent

112

103

103

117

111

106

Number 

of 

determinations

3

4

3

3

3

3

Number 

of 

determinations 

having

recoveries

within 

100±20% 

of the 

expected 

value

2

3

3

2

3

2

Range 

of 

recovery, 

in 

percent

98.3 to 

101

98.9 to 

102

101 to 

102

98.6 to 

104

94.4 to 

104

94.8 to 

101
Table 18.~Recoveries in standard reference water samples Continued

8

Range 

of 

Sample recovery, 

set in 

number percent

96.8 to 

122

93. 8 to 

99.2

100 to 

110

4 101 to 

105

99.5 to 

104

97.1 to 

6 105

Beryllium

Median 

recovery, 

in 

percent

102

96.7

105

103

103

104

, dissolved

Number 

of 

determinations

5

5

5

5

5

5

Beryllium, total

Number 

of 

determinations 

having

recoveries

within 

100±20% 

of the 

expected 

value

4

5

5

5

5

5

Range 

of 

recovery, 

in 

percent

90.5 to 

100

99.6 to 

109

90.2 to 

103

100 to 

102

94.9 to 

97.1

100 to 

102

Median 

recovery, 

in 

percent

90.9

103

99.6

101

96.0

100

Number 

of 

determinations

3

5

5

2

2

3

Number 

of 

determinations 

having

recoveries

within 

100±20% 

of the 

expected 

value

3

5

5

2

2

3

Range 

of 

recovery, 

in 

percent

100 to 

102

96.6 to 

112

101 to 

107

98.1 to 

106

97.2 to 

113

99.4 to 

107
Table 18.-Recoveries in standard reference water samples-Continued

Cadmium, total

Sample 

set 

number

1

2

3

4

5

6

Range 

of

recovery, 

in 

percent

98.8 to

103

98.2 to

102

101 to

106

94.2 to

103

100 to

107

102 to

106

Median

recovery, 

in 

percent

100

99.3

104

98.9

102

104

Number

of 

determinations

3

4

4

5

3

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

3

4

4

5

3

5

Range 

of

recovery, 

in 

percent

97.3 to

107

99.9 to

109

99.3 to

111

99.7 to

113

95.8 to

104

98.2 to

108

Chromium, dissolved

Median

recovery, 

in 

percent

98.6

104

101

106

101

103

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

5

5

5

5

5

Range 

of

recovery, 

in 

percent

88.2 to

108

103 to

110

58.8 to

103

91. 6 to

100

96.8 to

103

82.2 to

105

r
Table 18.--Recoveries in standard reference water samples Continued

Cobalt, dissolved

Sample 

set 

number

1

2

3

4

5

6

Range 

of

recovery, 

in 

percent

94.6 to 

109

99.2 to 

113

97.9 to 

106

96.9 to 

114

94.8 to 

108

99.0 to 

109

Median

recovery, 

in 

percent

97.2

102

102

102

98.4

104

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

5

5

5

5

5

Range 

of

recovery, 

in 

percent

98.8 to 

103

102 to 

123

108 to 

114

104 to 

116

114 to 

118

112 to 

118

Cobalt, total

Median

recovery, 

in 

percent

100

114

113

111

116

116

Number

of 

determinations

3

4

4

5

3

4

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

3

3

4

5

3

4

Range 

of

recovery, 

in 

percent

94.4 to 

104

92.7 to 

105

97.5 to 

105

92.0 to 

118

95.2 to 

107

101 to 

106
Table 18.-Recoveries in standard reference water samples Continued

Copper, total

Range 

of

Sample recovery, 

set in 

number percent

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

Median

recovery, 

in 

percent

97.1

97.0

103

99.0

98.0

100

Number

of 

determinations

3

4

4

5

3

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

3

4

4

5

3

5

Range 

of

recovery, 

in 

percent

98.2 to 

102

100 to 

103

101 to 

121

97.8 to 

117

95.9 to 

120

97.6 to 

118

Lead, dissolved

Median

recovery, 

in 

percent

99.6

101

103

102

104

99.7

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

5

4

5

5

5

Range 

of

recovery, 

in 

percent

102 to 

109

95.0 to 

99.4

100 to 

107

92.5 to 

112

91.0 to 

102

97.0 to 

108

r
Table 18. Recoveries in standard reference water samples Continued

Manganese, dissolved

Range

of

Sample recovery,

set in

number percent

95.6 to

104

98.3 to

104

99.3 to

i r\(\

109

4 97.7 to

110

101 to 

102

99.1 to 

6 105

Median

recovery,

in

percent

101

103

103

103

102

103

Number

of

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having 

recoveries

within

100±20%

of the

expected

value

5

5

5

5

5

5

Range

of

recovery,

in

percent

94.4 to

106

83. 7 to

95.2

95.9 to

97.1

99.1 to

116

93 .9 to 

106

94.6 to

100

Manganese, total

Median

recovery,

in

percent

96.7

94.3

96.4

103

104

99.2

Number

of

determinations

5

5

3

3

4

3

Number 

of 

determinations 

having 

recoveries

within

100±20%

of the

expected

value

5

5

3

3

4

3

Range

of

recovery,

in

percent

101 to

109

94.2 to

111

lllto

114

101 to

106

105 to 

122

75.6 to

106
Table 18.-Recoveries in standard reference water samples Continued

Mercury, total

Range 

of

Sample recovery, 

set in 

number percent

96.2 to 

117

83.0 to 

130

93.1 to 

101

70.7 to 

107

83.0 to 

104

77.0 to 

6 100

Median

recovery, 

in 

percent

103

89.4

97.3

87.2

99.6

89.0

Number

of 

determinations

5

4

2

4

4

4

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

3

2

3

4

2

Range 

of

recovery, 

in 

percent

98.0 to 

107

98.6 to 

104

96.4 to 

99.7

97.5 to 

101

100 to 

105

99.5 to 

105

Molybdenum, dissolved

Median

recovery, 

in 

percent

103

100

97.2

99.2

104

100

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100+20%

of the 

expected 

value

5

5

5

5

5

5

Range 

of

recovery, 

in 

percent

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
Table 18. Recoveries in standard reference water samples Continued

Nickel, dissolved

Sample 

set 

number

1

2

3

4

5

6

Range 

of

recovery, 

in 

percent

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

Median

recovery, 

in 

percent

93.1

95.8

96.9

111

95.7

99.8

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

5

5

5

5

5

Range 

of

recovery, 

in 

percent

97.7 to 

109

100 to 

106

97.7 to 

104

97.7 to 

109

97.7 to 

102

101 to 

135

Nickel, total

Median

recovery, 

in 

percent

99.1

101

102

104

101

111

Number

of 

determinations

3

4

4

5

3

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

3

4

4

5

3

4

Range 

of

recovery, 

in 

percent

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
Table 18. Recoveries in standard reference water samples Continued

01 

 si

Selenium, total

Range 

of

Sample recovery, 

set in 

number percent

1 90.4 to

111

2 89.8 to

118

3 75.0 to

87.0

4 83.7 to

92.1

5 78.0 to

94.1

6 81.6 to

89.2

Median

recovery, 

in 

percent

98.7

103

81.8

90.2

81.8

88.1

Number

of 

determinations

4

4

4

4

4

4

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

4

4

2

4

2

4

Range 

of

recovery, 

in 

percent

97.7 to

102

73.3 to

106

102 to

113

98.5 to

106

101 to

111

92.5 to

102

Silver, dissolved

Median

recovery, 

in 

percent

99.6

103

104

103

107

97.4

Number

of 

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having

recoveries

within 

100±20%

of the 

expected 

value

5

4

5

5

5

5

Range 

of

recovery, 

in 

percent

42.5 to

102

47.5 to

106

35.0 to

104

76.0 to

125

74.7 to

99.2

74.7 to

96.6
Table 18.-Recoveries in standard reference water samples-Concluded

I

PRINTING OFFICE: 199

oo 

i <n

-j 

*.

i

01 

NJ

(jj

co m 

o

NJ

(jJ

Ol 

00

Sample

set

number

1

2

3

4

5

6

Range

of

recovery,

in

percent

93.5 to

105

97.0 to

101

97.0 to

103

93 .5 to

96.1

96.1 to

98.7

93.5 to

100

Uranium,

Median

recovery,

in

percent

96.1

101

100

94.8

96.5

97.4

dissolved

Number

of

determinations

3

3

3

3

3

3

Zinc, dissolved

Number 

of 

determinations 

having 

recoveries

within

100±20%

of the

expected

value

3

3

3

3

3

3

Range

of

recovery,

in

percent

88.2 to

96.1

93.8 to

104

90.2 to

105

99.8 to

110

101 to

107

102 to

108

Median

recovery,

in

percent

93.6

98.7

97.1

104

103

107

Number

of

determinations

5

5

5

5

5

5

Number 

of 

determinations 

having 

recoveries

within

100±20%

of the

expected

value

5

5

5

5

5

5

Range

of

recovery,

in

percent

100 to

110

66.7 to

117

98.1 to

113

101 to

111

99.0 to

106

94.3 to

101