heavy metals and uranium in soil and water on sierrita site

table 3-2

esperanza mill

2005 analytical summary

 

arsenic

beryllium

cadmium

copper

manganese

molybden

nickel

zinc

surface soil samples
(2-3 inch depth) (mg/kg)

em-3

34.8

1

5.65

11,600

715

1,570

11

824

em-4

10.8

0.55

2.55

8,360

657

630

25

443

em-5

3.62

0.37

0.59

1,880

323

122

8

195

em-9

5.01

0.44

0.57

522

340

230

5

86

em-10

9.52

0.93

1.78

814

538

239

8

256

em-13

4.23

0.72

0.83

668

172

2,640

8

64

em-14

11.8

0.26

0.85

409

30

471

< 5

29

em-17

101

0.33

2.8

2,330

75.5

1,690

< 1

77

em-18

10.4

0.48

2.31

3,560

173

1,470

4

67

em-20

13.7

0.55

2.39

4,710

405

6,500

14

234

em-21

4.09

0.17

0.32

514

110

151

< 1

25

em-26

23

2.36

1.99

5,220

928

936

20

429

 

 

 

 

 

 

 

 

 

non-residential srl

10

11

850

63,000

43,000

8,500

34,000

510,000

subsurface soil
samples/depth (mg/kg)

em-t-1-1.5'

28.3

0.41

1.3

2,200

151

305

6

51

em-t-1-2'

23

0.82

na

9,850

na

229

na

na

em-t-1-6'

5.49

0.85

0.26

1,700

146

24

9

100

em-t-1-13'

1.35

0.69

na

159

na

3

na

na

em-t-2-2'

3.58

0.51

na

533

na

16

na

na

em-t-2-2.5'

5.3

0.70

3.6

1,170

31

1050

< 5

40

em-t-2-b18"

6.4

0.90

0.5

1,400

198

103

< 5

169

em-t-3-4

38.8

0.90

1.6

1,850

212

260

< 5

111

em-t-3-6'

4.7

1.03

1.37

1,270

593

21

8

209

em-t-3-12'

3.52

1.43

na

733

na

20

na

na

em-t-4-6'

6.77

0.76

2.83

2,020

250

550

6

104

em-t-4-10'

2.66

0.76

na

643

na

88

na

na

water quality sample (mg/kg)

em-ud

< 0.010

0.046

0.2

0.17

71

0.18

0.15

3.7

em-t-4

< 0.010

< 0.0010

< 0.0030

< 0.010

6.8

2.4

< 0.010

0.078

em-b-1

< 0.010

< 0.0010

0.0054

< 0.010

18.0

0.05

0.033

na

c-sump

< 0.010

0.0039

0.016

0.95

3.7

0 .63

0.030

1.4

em-up

0.012

< 0.0010

< 0.0030

0.011

< 0.010

0.041

< 0.010

< 0.050

em-mid

< 0.010

0.069

.0069

170

12

1.5

0.18

6.5

em-low

< 0.010

< 0.0010

0.0083

0.81

4.0

0.73

0.019

0.54

 

 

 

 

 

 

 

 

 

awqs

0.05a

0.004

0.005

ns

ns

ns

0.10

ns

 bold - concentration exceeds standard

notes:

srl = soil remediation level
gpl = groundwater protection level
awqs = aquifer water quality standards
rbsl = risk based screening level
mg/kg = milligrams per kilograms

 

 table 3-3. summary of uranium mass in groundwater

sierrita mine, green valley, arizona

 

table 3-3. summary of uranium mass in groundwater

sierrita mine, green valley , arizona

 

monitor

well or

location

 

average

uranium

(�g/l)

 

maximum

uranium

(�g/l)

 

minimum

uranium

(�g/l)

 

earliest

date

 

most

recent

date

number of

data

points

 

 

 

 

 

 

 

mh-17 (hr)

105.4

150

23.1

6/26/1997

7/13/2007

34

pz-01 (tp)

3.8

4.3

3.3

6/19/1997

8/12/1997

2

*mh-18 (tp)

16.2

23

10

6/19/1997

7/13/2007

30

 

 

 

 

 

 

 

pz-16 (dv)

24.3

76

2.3

11/2/2000

7/23/2007

23

*mh-19 (tp)

25.5

96.5

12

9/22/1998

7/20/2007

39

 

 

 

 

 

 

 

*mh-27 (dv)

nd

nd

nd

3/30/2005

8/6/2007

23

bw-02 (dv)

9.5

154

nd

7/3/2000

7/23/2007

19

*mh-20((dv)

6.1

18.6

nd

12/23/1997

7/24/2007

36

 

 

 

 

 

 

 

pz-02 (dv)

13.5

21

9.2

6/27/1997

7/23/2007

30

pz-03 (rs)

63.3

99.6

32

6/26/1997

7/12/2007

25

bw-03 (rs)

77.1

198

nd

7/3/2000

7/23/2007

24

 

 

 

 

 

 

 

*mh-21 (rs)

1,132

1,600

560

6/27/1997

7/13/2007

34

pz-04 (rs)

138

170

109

6/23/1997

7/12/2007

7

pz-05 (rs)

450

767

81.2

6/26/1997

7/16/2007

31

pz-06 (rs)

13

20

9

7/2/1997

7/12/2007

8

*mh-22 (q)

319.4

509

133

6/24/1997

7/16/2007

37

*mh-23 (dv)

59.2

130

6.7

7/2/1997

7/16/2007

33

 

 

 

 

 

 

 

pz-07 (q/rs)

12.3

13

12

11/16/2006

7/24/2007

4

pz-09 (q/rs)

190

210

170

7/11/1997

8/26/1997

2

pz-08 (dv)

14.3

15

14

11/14/2006

7/12/2007

4

 

 

 

 

 

 

 

mh-30 (q)

26.8

27

26

11/9/2006

7/11/2007

4

*mh-14 (q)

26.6

34

17

4/6/1998

7/10/2007

28

*mh-28 (q)

28.8

33

25

1/24/2006

8/6/2007

19

*mh-15w (q)

54.6

72

11

2/26/1998

7/11/2007

31

*mh-29 (q)

28.3

32

26

1/24/2006

8/6/2007

22

*mh-16w (q)

5.9

10

4

2/26/1998

7/11/2007

29

epa mcl

30 ug/l**

 

 

 

 

 

 

**mcl for uranium established 2003

 notes: * - denotes app point of compliance (poc) well
hr - harris ranch monzonite
tp - formation of tinaja peak
dv - demetrie volcanics
rs - ruby star granodiorite
q - alluvium
q/rs - alluvium over ruby star granodiorite

 

source: voluntary remediation program (vrp)
investigation work plan
volume i of ii
text, tables & figures
freeport-mcmoran sierrita inc.
6200 west duval mine road
green valley, az 85622-0527
april 2008
contact: ned hall
(520) 648-8857


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