appendix b – soil sample summary · appendix b – attachment b-5 csc b-5-2 january 2010...

$: APPENDIX B – SOIL SAMPLE SUMMARY · Appendix B – Attachment B-5 CSC B-5-2 January 2010 X:\Casmalia Draft Final RI Report\Appendix B\Apx B Text.doc better box plot representation$
Casmalia Site Draft Final Remedial Investigation Report Appendix B – Attachment B-5

C S C B-5-1 January 2010 X:\Casmalia Draft Final RI Report\Appendix B\Apx B Text.doc

Box plots are presented in Figures B5-1 through B5-21 that summarize, for each of 21 metals, the data distribution for each study area as well as background. For perspective, toxicity screening levels are identified. Each box plot depicts a summary of the associated data distribution along a log transformed scale, as follows. The open box incorporates the middle 50% of the data referred to as the inter-quartile range (IQR), and thus is stretched between the 75th percentile and the 25th percentiles of the data (see in-text diagram below). The median is indicated by a black bar. The dotted lines, referred to as whiskers, stretch to the highest data point before what is considered by the algorithm to be an isolated value, a potential outlier. The end limits of each upper (or lower) whisker is an observed data point that is no more than 1.5 times the IQR above the upper edge of the open box (or below the lower edge). Any separate lines above or below the whisker limits are potential outliers. Outliers are considered unusual, and outside the distribution of remaining data, however interpretation of why the outlier exists (analysis error, localized contamination, etc.) must be made on a case by case basis. Under each study area abbreviation, the total sample size and number of detected values (in parenthesis) are indicated.

. . .

potential outliers

Censored data are plotted at their detection limits. However, using this, or any other replacement value occasionally affects the size, location, or behavior (e.g. what is considered an outlier), of the boxes to the extent that the plot itself can be misleading. For example, in the figures for Cobalt, the box plot algorithm does not show a box for the middle 75% of the data, but only a line for the median. In effect, the box does not extend beyond the median because 53 of the 97 background data points (over 50%) are “less than 5.0” and represented as all equaling 5.0 (rather than as their unique unknown concentrations varying in the range less than 5. When the central 50% of the data points are equal, the algorithm considers all remaining points (most of which, in this case, are detected concentrations) as low and high outliers. A

. . .

median

whisker (data within expected lower tail of distribution)

box (middle 50% of data)

whisker (data within expected upper tail of distribution)

Casmalia Site Draft Final Remedial Investigation Report Appendix B – Attachment B-5

C S C B-5-2 January 2010 X:\Casmalia Draft Final RI Report\Appendix B\Apx B Text.doc

better box plot representation of the sampled population would involve using specialized statistical methods censored data, such as regression order statistics (Helsel, 1994). Aside from detection limit uncertainty, these box plots are helpful for quickly viewing distributions as varying across the site and also for identifying outliers. Although the condensation of the full information contained in a given data into only a few statistics (IQR, median, and outliers) necessarily drops information which may sometimes be important (in particular cases), this condensation allows many box plots to be grouped onto a single page to compare across study areas. The calculation of box and whiskers on the log transformed data scale was chosen because background and study area metals were found to have skewed distributions generally characterized by a lognormal distribution type. The box plot whiskers calculated from and applied to log-transformed data identify outliers that are “outside” of expectations for a lognormal distribution.

References Helsel, D.R., Hirsch, R.M., 1994. Statistical Methods in Water Resources. John Wiley.

Casmalia Resources Superfund Site Final Remedial Investigation Report Attachment B-5

C S C B - 5 - 3 January 2011 X:\CASMALIA FINAL RI REPORT\_REPORT ON CD\APPENDIX B\ATTACHMENTS\ATT B-5\ATTACH B-5 TOC.DOC

Box Plots

List of Figures Figure B5-1 – Log Scale Box Plots of Aluminum (0 to 10 feet) Figure B5-2 – Log Scale Box Plots of Antimony (0 to 10 feet) Figure B5-3 – Log Scale Box Plots of Arsenic (0 to 10 feet) Figure B5-4 – Log Scale Box Plots of Barium (0 to 10 feet) Figure B5-5 – Log Scale Box Plots of Beryllium (0 to 10 feet) Figure B5-6 – Log Scale Box Plots of Cadmium (0 to 10 feet) Figure B5-7 – Log Scale Box Plots of Chromium (0 to 10 feet) Figure B5-8 – Log Scale Box Plots of Cobalt (0 to 10 feet) Figure B5-9 – Log Scale Box Plots of Copper (0 to 10 feet) Figure B5-10 – Log Scale Box Plots of Iron (0 to 10 feet) Figure B5-11 – Log Scale Box Plots of Lead (0 to 10 feet) Figure B5-12 – Log Scale Box Plots of Magnesium (0 to 10 feet) Figure B5-13 – Log Scale Box Plots of Manganese (0 to 10 feet) Figure B5-14 – Log Scale Box Plots of Mercury (0 to 10 feet) Figure B5-15 – Log Scale Box Plots of Molybdenum (0 to 10 feet) Figure B5-16 – Log Scale Box Plots of Nickel (0 to 10 feet) Figure B5-17 – Log Scale Box Plots of Selenium (0 to 10 feet) Figure B5-18 – Log Scale Box Plots of Thallium (0 to 10 feet) Figure B5-19 – Log Scale Box Plots of Tin (0 to 10 feet) Figure B5-20 – Log Scale Box Plots of Vanadium (0 to 10 feet) Figure B5-21 – Log Scale Box Plots of Zinc (0 to 10 feet)

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218 (218)

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39 (39)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Alu

min

um (

mg/

kg)

Figure B5−1Log Scale Box Plots of Aluminum (0 to 10 Feet)

Casmalia Resources Superfund Site Remedial Investigation

Study Area or Pond With Number of Samples (Number of Detections)

With MDL assigned to non−detects

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1000

3200

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032

000

1e+

05

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Residential PRG (76000)

Industrial PRG (100000)

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26 (0)

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218 (0)

LiqT

41 (0)

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39 (1)

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18 (0)

PD−A 12 (0)

RCRA 102 (1)

WCSA 36 (0)

Road 60 (0)

ROS 63 (3)

Ant

imon

y (m

g/kg

)Figure B5−2

Log Scale Box Plots of Antimony (0 to 10 Feet)




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30.

032

0.1

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13.

210

Ecological Soil SL (0.27)

Background UTL (4.0)

... Residential PRG (31)

... Industrial PRG (410)

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41 (36)

FPP

218 (209)

LiqT

41 (39)

MS

39 (38)

PD−RCF 18 (18)

PD−A 12 (10)

RCRA

102 (100)

WCSA 36 (36)

Road

60 (58)

ROS

63 (61)

Ars

enic

(m

g/kg

)Figure B5−3

Log Scale Box Plots of Arsenic (0 to 10 Feet)




0.00

440.

010.

11

1010

0

Residential PRG − CA (0.062)

Industrial PRG − CA (0.251)

Residential PRG (0.39)

Industrial PRG (1.59)

Ecological Soil SL (18)Background UTL (22)

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26 (26)

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41 (40)

FPP

218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Bar

ium

(m

g/kg

)Figure B5−4

Log Scale Box Plots of Barium (0 to 10 Feet)




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320

1000

3200

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032

000


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11 (11)

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26 (26)

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41 (40)

FPP

218 (218)

LiqT

41 (41)

MS

39 (38)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (101)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Ber

ylliu

m (

mg/

kg)

Figure B5−5Log Scale Box Plots of Beryllium (0 to 10 Feet)




0.12

0.16

0.25

0.4

0.63

11.

6

Background UTL (.91)

... Updated Eco Soil SL (10)

... Ecological Soil SL (20)



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41 (41)

FPP

218 (218)

LiqT

41 (41)

MS

39 (38)

PD−RCF 28 (28)

PD−A 22 (22)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Cad

miu

m (

mg/

kg)

Figure B5−6Log Scale Box Plots of Cadmium (0 to 10 Feet)




0.11

0.32

13.

210

3210

0



Updated Eco Soil SL (32)Residential PRG (37)


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26 (26)

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41 (41)

FPP

218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Chr

omiu

m (

mg/

kg)

Figure B5−7Log Scale Box Plots of Chromium (0 to 10 Feet)




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13.

210

3210

032

010

00


Background UTL (64)



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218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (101)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Cob

alt (

mg/

kg)

Figure B5−8Log Scale Box Plots of Cobalt (0 to 10 Feet)




0.82

3.2

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320

1000


Background UTL (20)


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41 (40)

FPP

218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 28 (28)

PD−A 22 (22)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Cop

per

(mg/

kg)

Figure B5−9Log Scale Box Plots of Copper (0 to 10 Feet)




0.00

820.

11

1010

010

0010

000

Background UTL (19)Ecological Soil SL (28)

Updated Eco Soil SL (70)



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41 (41)

FPP

218 (215)

LiqT

41 (41)

MS

39 (38)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (101)

WCSA 36 (36)

Road

60 (60)

ROS

63 (60)

Iron

(m

g/kg

)Figure B5−10

Log Scale Box Plots of Iron (0 to 10 Feet)




4810

010

0010

000

1e+

051e

+06

1e+

071e

+08




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11 (0)

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26 (11)

CDA 41 (6)

FPP

218 (39)

LiqT

41 (7)

MS

39 (7)

PD−RCF

28 (8)

PD−A 22 (5)

RCRA

102 (34)

WCSA 36 (9)

Road 60 (4)

ROS

63 (12)

Lead

(m

g/kg

)Figure B5−11

Log Scale Box Plots of Lead (0 to 10 Feet)




0.02

10.

11

1010

010

00


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218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Mag

nesi

um (

mg/

kg)Figure B5−12

Log Scale Box Plots of Magnesium (0 to 10 Feet)




1000

3200

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032

000

1e+

05


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26 (26)

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39 (39)

FPP

218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Man

gane

se (

mg/

kg)Figure B5−13

Log Scale Box Plots of Manganese (0 to 10 Feet)




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1000

3200

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032

000






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11 (3)

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26 (9)

CDA

39 (12)

FPP

212 (49)

LiqT

41 (13)

MS

39 (9)

PD−RCF

28 (7)

PD−A 21 (3)

RCRA 90 (35)

WCSA 35 (11)

Road

59 (24)

ROS

61 (22)

Mer

cury

(m

g/kg

)Figure B5−14

Log Scale Box Plots of Mercury (0 to 10 Feet)




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26 (20)

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41 (28)

FPP

218 (134)

LiqT

41 (29)

MS

39 (15)

PD−RCF

18 (8)

PD−A 12 (8)

RCRA

102 (47)

WCSA 36 (18)

Road

60 (31)

ROS

63 (37)

Mol

ybde

num

(m

g/kg

)Figure B5−15

Log Scale Box Plots of Molybdenum (0 to 10 Feet)




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218 (218)

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41 (41)

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102 (102)

WCSA 36 (36)

Road

60 (60)

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63 (63)

Nic

kel (

mg/

kg)

Figure B5−16Log Scale Box Plots of Nickel (0 to 10 Feet)




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320

1000

3200



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218 (45)

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PD−RCF

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PD−A 12 (4)

RCRA

102 (52)

WCSA 36 (14)

Road 60 (8)

ROS

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Sel

eniu

m (

mg/

kg)

Figure B5−17Log Scale Box Plots of Selenium (0 to 10 Feet)




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210

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218 (199)

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41 (34)

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39 (33)

PD−RCF 18 (12)

PD−A 12 (10)

RCRA

102 (87)

WCSA 36 (31)

Road

60 (51)

ROS

63 (53)

Tha

llium

(m

g/kg

)Figure B5−18

Log Scale Box Plots of Thallium (0 to 10 Feet)




0.00

055

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0.1

110



Residential PRG (5.2)


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41 (33)

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218 (184)

LiqT

41 (35)

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39 (33)

PD−RCF 18 (10)

PD−A 12 (10)

RCRA

102 (86)

WCSA 36 (31)

Road

60 (42)

ROS

63 (47)

Tin

(m

g/kg

)Figure B5−19

Log Scale Box Plots of Tin (0 to 10 Feet)




1.4

3.2

1032

100

320


Background UTL (65)



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●

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●

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●

●

●

●

●

●

●●

●●

●●

BKG

97 (97) All Depths

Off

16 (16)

Adm

11 (11)

BC

26 (26)

CDA

41 (40)

FPP

218 (218)

LiqT

41 (41)

MS

39 (38)

PD−RCF 18 (18)

PD−A 12 (12)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Van

adiu

m (

mg/

kg)

Figure B5−20Log Scale Box Plots of Vanadium (0 to 10 Feet)




1.2

3.2

1032

100

320

1000


Residential PRG (78) Background UTL (81)


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●

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●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●●

●

●

●

●

●

●

●

●

●

●

BKG

97 (97) All Depths

Off

16 (16)

Adm

11 (11)

BC

26 (26)

CDA

41 (40)

FPP

218 (218)

LiqT

41 (41)

MS

39 (39)

PD−RCF 28 (28)

PD−A 22 (22)

RCRA

102 (102)

WCSA 36 (36)

Road

60 (60)

ROS

63 (63)

Zin

c (m

g/kg

)Figure B5−21

Log Scale Box Plots of Zinc (0 to 10 Feet)




1032

100

320

1000





appendix b – soil sample summary · appendix b – attachment b-5 csc b-5-2 january 2010...

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