SDMS

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Midvale Slag Superfun d Site Operable Unit 2 Midvale, Utah

Proposed Alternate Concentration Limits

September 2002

S^frtlD

200163J

Technical Memorandum
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Technical Memorandum Midvale Slag Operable Unit 2

• Proposed Alternate Concentration Limits II

Section 1

Introduction

The purpose of this technical memorandum is to present the methodologies used to

develop alternate concentration limits (ACLs) and propose ACL numeric values for

t he Midvale Slag Operable Unit 2 Superfun d Site (Site). ACLs will be established in

groundwater in the Upper Sand and Gravel (US&G) aquifer and will be used to

monitor the preferred groundwater remedial alternative for the site. A discussion is

also provided regarding the relationship between the ACL s and management of areas

considered to be the sources of US& G aquifer contamination.

COM 1-1

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Section 2 

Background 

T he preferred groundwater alternative presented in the proposed plan is Alternative GW-2, Limited Action with Alternate Concentration Limits. A preliminary

determination of these ACLs was presented in the Appendix B of the groundwater

focused feasibility study (FFS) (CDM Federal Programs Corporation [CDM] 2002). T he determination was based on meeting the requirements of Section 121(d)(2)(B)(ii)

of the Comprehensive Environmental Response, Compensation and Liability Act

(CERCLA). Several steps were used in the FFS to establish ACL s for contaminants of •

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concern (COCs) at the Site:

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• COCs for which ACL s were considered were limited to contaminants that emanate

from source areas in OU2 and that have known or projected points of discharge to

the Jorda n River (antimony, arsenic, cadmium, and selenium).

• Preliminary ACL s for selected COCs are based on a back calculation from water |

quality criteria for surface water concentrations in the Jorda n River (either Utah

water quality standards or background concentrations). •

• Preliminary ACL s do not reflect a statistically significan t increase in down-river

surface water concentrations. •

T he calculations presented in the FFS have been revised based on comments received

by stakeholders, an expanded assessment of background surface water

concentrations, and the need to determine ACL s for point of assessment locations. The modifications made to the calculations and the use of the revised ACL values in

groundwater monitoring are discussed in Section 3. Calculation s are included in •

Attachment A. Comments were also received regarding the management of areas •

considered to be source areas for groundwater contamination and the resulting

influence on the validity of the ACLs . These issues are discussed in Section 4. I

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P:V32BO-RAC3\086\ACL\Documant»\ACt. Tech Memo Final.doc
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Section 3 Revised ACL Calculations

The ACL calculations have been revised based on an assessment of the background

surface water concentrations for selected COCs. ACL values have been calculated

followin g two methods. The first method is based on a back calculation from a

promulgated surface water quality standard in the Jorda n River. The second method

is based on not surpassing a statistically significant increase in surface water

concentrations in the Jordan River from the upgradient to the downgradient side of

the site. An overview of methods used and the results of the calculations are

provided in the followin g sections. In addition, preliminary ACLs have been

calculated for discrete locations within the arsenic plume at the boundary of the

Jordan River for use in assessment monitoring.

3.1 Calculation Based on Surface Water Quality Criteria

Promulgated surface water quality criteria for the reach of the Jordan River (UAC 317-

2) can be used to calculate the maximum allowable groundwater concentration that

can discharge to the river through a flow-weighted mixing method. In this method,

the flo w rate and background concentration in the Jorda n River are known, the

discharge rate for the contaminated groundwater is known, and the allowable

concentration in groundwater (ACL) is back calculated based on not exceeding the

selected surface water quality criteria. A design low-flow rate for the Jordan River is

used in the calculation so that resultant groundwater concentrations could not result

in a surface water quality exceedance at normal flow rates. Surfac e water of the

Jordan River is designated Class 2B (protected for secondary contact recreation), Class

3A (protected for cold water species of game fish and other cold water aquatic life),

and Class 4 (protected for agricultural uses). The lowest concentration value among

the three classes was used in the ACL calculations.

The values used and results of the calculations are shown in Table 3-1. Calculatio n

briefs are provided in Attachment A. The ACL s that result from this calculation are

average values for the entire constituent plume at the point of discharge to tine river. Therefore, the one calculated value is a representative ACL value for the entire plume,

regardless of location within the plume.

COM 3-1

P:O280.RAC8\086W:UDocumen!sVACL T«cti Mamo Flnal.do c
Section 3 Revised ACL Calculations

Tabl e 3-1 ACL s Based on Surfac e Water Qualit y Criteria

Contaminant

of Concern

Arsenic

Cadmium

Selenium

Antimon y

Site-Specifi c Data

Background

River Cone.

(TO/L )

11

0.9

1.9

0.6

River

Design

Low-Flow

Rate

21.72

21.72

21.72

21.72

Groundwater

Flo w Rate

(cfs )

0.31

0.072

0.144

0.043

Water Qualit y Criteria

Clas s

4

3A

3A

3

Concentratio n

(jjg/ D

100

1 .1

5

4,300

A CL (pg'L )

6,336

61

473

2,175,997

j;g/L = micrograms per liter cfs = cubic feet per second Surface water quality criteria in Jordan River (UAC 317-2)

3 -Criteria for Human Health 3A -Criteria for Aquatic Wildlife (Cold Water)

4 -Agricultural and Stock Watering

3 .2 Calculation Based on No Statisticall y Significan t

Increase in Surface Water Concentrations

The background water quality for the reach of the Jorda n River above OU2 can be

used to calculate the maximum allowable groundwater concentration that can

discharge to the river through the same flow-weighted mixing method. In this

method, the flo w rate and background concentration in the Jorda n River are known,

the discharge rate for the contaminated groundwater is known, and the allowable

concentration in groundwater (ACL) is back calculated based on not exceeding one

standard deviation in the background water quality. The minimum mean daily flo w

rate for the Jordan River is used in the calculation so that a statistically significant

increase is not observed at average daily flow rates. The values used and results of

the calculations are shown in Table 3-2. Calculation brief s are provided in

Attachment B. The ACL s that result from this calculation are average values for the

entire constituent plume at the point of discharge to the river. Therefore, the one

calculated value is a representative ACL value for the entire plume, regardless of

location within the plume.

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P:U280.RAC8\086\ACUDocuinef«W:L Tech Memo Firal.doc

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Section 3 Revised ACL Calculations

Tabl e 3-2 ACL s Based on Statisticall y Significan t Increase

Contaminan t of Concern

Arsenic

Cadmium

Selenium

Antimon y

Site-Specifi c Data

Background

River Cone.

(M9/L )

11

0.9

1.9

0.6

Standard

Deviation

(P9/L )

5.5

0.7

0.8

0.1

Min . Mean

Dail y River

Flo w Rate

(cfs )

161.3

161.3

161.3

161.3

Groundwater

Flo w Rate

(cfs )

0.31

0.072

0.144

0.043

A CL

(pg/L

2,870

1,560

900

380

3.3 Calculation of Arsenic Concentrations at Discrete

Locations

T he previous two calculations provided ACL values that are representative of the

entire plume versus discrete locations or segments of the plume. The followin g

calculation employs a weighting method that allows the center of the plume to

contribute more and the fringes of the plume to contribute less based on the observed

plume configuration. In this example, the arsenic plume has been separated into five

segments as shown in Figure 3-1. The values used and results of the calculations are

shown in Table 3-3. The ACL s that result from this calculation are average values for

each segment as would be measured at the point of discharge to the river. The

average arsenic ACL based on the entire plume, as calculated in sections 3.1 and 3.2

are presented at the bottom of the table for comparative purposes.

COM 3-3

P:\32aO-RACaV036\ACLtDocuments\ACL Tech Memo FiuLdoc
Section 3 Revised ACL Calculations

Tabl e 3-3 Comparison of Discrete Location Arsenic ACL s

Location

Segmen t 1

Segmen t 2

Segmen t 3

Segmen t 4

Segmen t 5

Average discharge

concentration

Observed

Cone.

(H9/L )

160

1,300

1,900

1,000

450

710

A CL Based on

Water Qualit y

Criteria (\iglL)

(see Section 3.1)

1316

10,690

15,623

8,223

3,700

6,336

A CL Based on

Significan t

Increase (pg/L )

(see Sectio n 3.2)

596

4,842

7,077

3,725

1,676

2,870

As shown in Table 3-3, the ACL for arsenic could range from 2,870 pg/ L to 15,623 Pg/L based on the method used and the use of averaging versus discrete points. The

maximum observed arsenic concentration observed in monitoring wells completed

within the arsenic plume near the discharge points along the Jorda n River over the

period from from 1997 to 2001 ranges from 160 pg/ L to 1,900 pg/ L

3 .4 Selectio n of ACL s for Groundwater Monitoring Based on the revised calculations, the followin g ACL s are recommended for use

during groundwater monitoring in points of assessment adjacent to the Jorda n River:

Arsenic

A value of 7,000 pg/ L is proposed. Thi s ACL provides that the groundwater

discharge from the core of the plume will not result in a statisticall y significant

increase in the concentrations within the Jorda n River.

Cadmium

A value of 1,560 pg/ L is proposed. The cadmium plume has not yet reached the Jordan River. This ACL is based on projected points of entry for the cadmium plume,

and provides that the groundwater discharge from the entire plume will not result in

a statistically significant increase in the concentrations within the Jorda n River.

Selenium

A value of 900 pg/ L is proposed. The selenium plume has not yet reached the Jorda n River. This ACL is based on projected points of entry for the selenium plume, and

provides that the groundwater discharge from the entire plume will not result in a

statistically significant increase in the concentrations within the Jorda n River.

COM 3-4

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Section 3 Revised ACL Calculations

Antimony A value of 380 Mg/L is proposed. Thi s ACL is based on projected points of entry for

the antimony plume, and provides that the groundwater discharge from the entire

plume will not result in a statistically significant increase in the concentrations within

the Jordan River.

COM 3-5

P-V3230-RACa\Oe8WCHDocum«msWCL Tech Memo Final.doc
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Section 4 I Influence of Source Areas on ACL s •

Previous groundwater contaminant transport modeling work performed for arsenic B

in the US& G aquifer was reviewed to evaluate whether variations in estimates of

source area volume and/or concentration would change the results of the modeling. I Predictions of arsenic concentrations in the US& G aquifer made from modeling are TM

presently compared to the ACL for arsenic in order to evaluate whether an

exceedance is likely. As a result, changes in modeling results based on revisions in •

source area characteristics could affec t the evaluation of ACL exceedance. TM

The influence of arsenic source areas on the US& G aquifer was examined during the •

supplemental remedial investigation in 1998 (Sverdrup 1998). A simple analytical ^

groundwater flo w and contaminant transport model was developed using AT123D to

predict arsenic transport in the US& G aquifer under current site conditions. In this •

modeling exercise, individual simulations of simplified sources were superimposed to ^

yield a composite arsenic distribution in the aquifer. The source area contaminant

levels were adjusted to achieve the currently observed distribution of arsenic. Source •

contaminant levels were assumed to be constant for the 200-year period of the

simulation. Based on the retardation factor used in the calculation (29.4) and the ,_

observed groundwater velocity (1.2 feet per day), it is estimated that arsenic releases I

to the aquifer began about 70 years ago. The model predict s that concentrations

approaching steady state will be reached approximatel y 200 years (130 years from ^

now) from initial release, with concentrations of up to 5,000 Mg/ L reaching the Jorda n • River in the core of the plume (the average plume discharge at this time is

appro ximately 900 M g/ L). m

Conclusions that can be drawn from this modeling are as follows:

• Source area contamination levels were estimated independentl y of the volume or •

concentration of the source materials. Loadin g rates were adjusted to achieve the

observed condition. As a result, variations in estimates of leachable volumes of ;•

materials .present on the site have no impact on the model results. •

• Source area strengths were assumed to be constant. Thi s is conservative since «

source loading generally decreases with time. •

• Leaving sources areas in place does not affec t modeling results. Source loadin g ^

rates assumed that present conditions would continue. •

• The effect s of potential enhanced leaching of sources were not incorporated. — Therefore, the validity of the model results depends on maintaining infiltration at •

current rates. Institutional controls will be necessary to limit surface irrigation and

infiltration caused by surface water management to maintain the infiltration •

conditions. •

I COM 4-1

P:\3230-RACa\Ofl6\ACUDocurnenta\ACL Tacf t Memo Final.doc I
2254400

2254200-

2254000-

2253800-

2253600-

2253400-

2253200-

2253000-

2252800

464300 464500 464900 465100 465300

4290 Maximum Arsenic Concentration (ug/L)

US&G Groundwater Elevation (2001) Contour interval = 0.5 ft

Plume Segmen t Boundary N

Figure 3-1

Maximum Dissolved Arsenic US&G Aquifer, 1997-2001 Midvale Slag Superfun d Site Midvale , Utah
I

Attachment A Calculation Based on Surface Water Quality Criteria
COM

Midvale Slag OU2 By: B. Cotton 8/26/2002

3282-986-FSZ-FGRCZ Ck: MJ S 8/30/2002 Maximum Allowable Average Discharge Concentrations in the US&G Aquifer based on Surfac e Water Quality Criteria

Objective -Estimate maximum average discharge concentrations for site-derived constituents in the US&G Aquifer

that will not result in exceedances in the surface water quality of the Jorda n River at design low flo w

rates.

Method - Groundwater concentrations are estimated by back-calculating from surface water quality criteria. A weighted average mixing calculation is performed. This calculation requires estimation of the flo w

contribution made by groundwater, estimation of the design low flow rate in the river, and the estimation

of the upstream concentration in the Jorda n River. The maximum concentration in groundwater can

then be calculated as follows:

or:

where:

Criv*Qriv + Qgw*Cgw = (Qriv + Qgw)*Cwqc

Cgw = ((Cwqc - Criv)*Qriv)/Qgw + Cwqc

Criv = upstream surface water concentration Qriv = flow rate for river C gw = maximum allowable average discharge concentration in groundwater Q gw = flo w rate for contaminated groundwater Cwqc = water quality criteria for river

Assumption s - T he followin g assumptions are made:

1. Upstream consituent concentrations in the Jorda n River have been estimated separately .

2. The design low flow rate for the river is 21.72 cfs. This is the 4E3 defaul t chronic design

flow . The value below which the 4-day harmonic mean flo w does not drop more than once

every 3 years, on average.

3. The groundwater discharge rate for respective constituent plumes have been estimated

separately.

4. The lowest standard per each constituent is used as provided for in UAC R317-2 per the

reach of the Jorda n River in OU2.

Calculation s - T he followin g table summarizes the values used in the calculation and the results.

Constit.

As Cd Se Sb

Criv

ug/ l

11

0.9

1.9

0.6

Qriv

c fs

21.72

21.72

21.72

21.72

Qgw

c f s

0.31

0.072

0.144

0.043

Cwqc

ug/ l

100

1.1

5

4300

Standard

4

3A

3A

3

C gw

ug/ l

6,336

61

473

2,175,997

Re: MAADC.xls Page 1 of 2

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COM

Midvale Slag OU2 By: B. Cotton 3/26/2002

3282-986-FSZ-FGRCZ Ck: MJ S 3/30/2002 Maximum Allowable Average Discharge Concentrations in the US&G Aquifer based on Surfac e Water Quality Criteria

References - E PA 2002. Estimated background concentrations in surface water of the Jorda n River. August 30,

2002. (attached)

C OM 2002. Estimated groundwater infow rates; arsenic, cadmium, selenium, and antimony plumes. Calculation brief s presented in Appendix C of the Groundwater FFS.

C DM 2001. Jorda n River low flow evaluation. Calculation brief presented in Appendix C of the Groundwater FFS .

File: MAADC.xl s Page 2 of 2
Attachment B Calculation Based on No Statistically Significant Increase in Surface Water Concentrations
COM

Midvale Sla g OU2 By: B. Cotton 8/26/2002

3282-986-FSZ-FGRCZ Ck: MJ S 8/30/2002 Maximum Allowable Average Discharge Concentration s in US&G Aquifer based on Statistically Significan t Increase

Objective -Estimate allowable average discharge concentrations for constituent s in the US&G Aquifer that will not result in statisticall y significan t increases in the correspondin g surface water qualit y of the • Jorda n River. •

Method - M A simple mixing model is applied. The flow rate and concentration in the ground water is added

to the flow rate and concentration in the river.

C = (Cgw*Qgw + Criv*Qriv) / (Qgw + Qriv) I

where: m C = surface water concentration after mixin g I C gw = average discharge concentration from the groundwater plume Q gw = flo w rate for ground water plume _ Criv = surface water concentration prior to mixin g • Qriv = surface water flo w rate prior to mixin g

T he surface water flow rate, Qriv, is the mean dail y flo w rate for the reach of the Jorda n River in • OU2. The mean dail y flo w rates are estimated using the dail y flo w statistics developed for USGS • Gage No. 10170490 - Combined Flo w of Jorda n River and Surplu s Canal . A correlation between

flo w data from this gage, located down stream of the site, and the gage nearer the site (USGS Gage No. 10167230 - Jorda n River at 9000 South, near Midvale , UT) was determined as part of

l ow flo w calculations . Thi s relationship is:

Qus = 0.7825*Qds-158.72

where:

I

eie. M Qds = dail y mean flo w rate at gage 10170490 (downstream) • Q us = dail y mean flo w rate at gage 10167230 (Midvale)

T he average discharge concentration in groundwater (Cgw ) is varied such that the concentration •

in the Jorda n River after mixing (C) is always less than that which would be deemed a statisticall y TM

significan t increase. Thi s level of increase can been defined by the variabilit y in the sample

results. . •

Assumption s - • T he followin g assumptions are made:

1. Mean background COC concentrations have been estimated separately . M

2. The calculated mean dail y flow rates are representative of average condition s for the • Jorda n River at Midvale Slag OU2.

3. Groundwater discharge rate for the respective constituent plume s have been estimated _ separately . •

4. A statisticall y significan t increase requires a measurement value greater than 1

standard deviation s above the mean concentration.

File: StatSig.xl s Sheet: Calc. Page 1 of 2

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U2 By: B. Cotton 8/26/2002

=GRCZ Ck: MJS 8/30/2002 Maximum Allowable Average Discharge Concentrations in US&G Aquifer based on Statistically Significan t

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1

1

1

1

1

1

1

1

1

1

1

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1

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Midvale Sla

3282-986-F Maximum A Increase

Calculation s A

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References C

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CP

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File: StatSig.xl s Sheet: Calc.

Assumed background concentrations and the relative standard deviation for each constituent

(based measured stream concentrations) are as follows:

Constit. As Cd Se SbCone.

ug/L

11

0.9

1.9

0.6

SD

uq/l

5.5

0.7

0.8

0.1

Maximum SW Cone,

ug/ l

16.50

1.60

2.70

0.70

Constit. As Cd Se SbFlow Rate (cfs)

0.31

0.072

0.144

0.043

Calculation s are provided per constituent in a correspondin g table. Graphs are included showing

t he predicted concentration in the Jorda n River as a result of discharge, and the probabilit y of not

exceeding surface water concentrations near the maximum. A summary of the maximum allowed

groundwater discharge concentrations is presented in the followin g table:

Constit . As Cd Se SbMaximum GW Cone. (ug/L)

2870

1560

900

380

C OM 2002. Maximum allowable average discharge concentration for the US&G Aquifer based on

surface water quality criteria. Calculatio n brief Augus t 2002.

C OM 2002. Estimated groundwater infow rates; arsenic, cadmium, selenium, and antimon y

plumes . Calculatio n brief s presented in Appendix C of the Groundwater FFS.

USGS 2002. Water resources data. Dail y streamflow statistics for station 10170490 - Combined Flow , Jorda n River and Surplus Canal at Salt lake City , UT

E RA 2002. Estimated background concentrations in surface water of the Jorda n River. Augus t

30, 2002.

USGS 2002. Water resources data. Dail y streamflow statistics for station 10170490 - Combined Flow, Jorda n River and Surplus Canal at Salt lake City, UT

Page 2 of 2
Estimated Mean of Mean Daily Flow Rates and Predicted Arsenic Concentration s in the Jorda n River

with Groundwater Discharge at 2870 ug/l Midvale Slag OU 2

Jorda n River Mean Flo w

As Concentration

100 0.0

Day

File : StatSig.xl s Page: As Cone. & Flow

9/24/2002 Page 1 of 1
Estimated Arsenic Concentrations in the Jorda n River at Mean Daily Flow Rate Probabilit y of Non-Exceedance with Groundwater Discharge at 2870 ug/l

and Upstream Concentration at 11 ug/l

1.00

0.90

0.10

0.00

12.0 12.5 13.0 13.5 14.0 14.5 15.0

Concentration (ug/l )

15.5 16.0 16.5 17.0

File: StatSig.xl s Page: As Prob.

9/24/2002 Page 1 of 1
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentration s in the Jorda n River based on Mean of Dail y Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.31 cfs Average ground water concentration = 2870 ug/l Average surface water concentration = 11 ug/l

Max= 16.51 M in = 12.59

Month

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

Day

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Mean Flow Rate - DG

(cfs )

470

474

476

467

471

470

468

469

470

474

479

480

481

487

488

487

493

480

481

472

486

488

487

488

494

501

503

502

498

497

499

502

506

522

527

531

533

534

536

540

543

550

560

567

578

578

576

Mean Flow Rate - UG

(cfs)

209.1

212.2

213.8

206.7

209.8

209.1

207.5

208.3

209.1

212.2

216.1

216.9

217.7

222.4

223.1

222.4

227.1

216.9

217.7

210.6

221.6

223.1

222.4

223.1

227.8

233.3

234.9

234.1

231.0

230.2

231.7

234.1

237.2

249.7

253.7

256.8

258.4

259.1

260.7

263.8

266.2

271.7

279.5

285.0

293.6

293.6

292.0

Mixed Cone,

(ug/l )

15.23

15.17

15.14

15.28

15.22

15.23

- 15.27

15.25

15.23

15.17

15.10

15.08

15.07

14.98

14.97

14.98

14.90

15.08

15.07

15.20

14.99

14.97

14.98

14.97

14.88

14.79

14.77

14.78

14.83

14.85

14.82

14.78

14.73

14.54

14.49

14.45

14.43

14.42

14.40

14.36

14.33

14.26

14.17

14.11

14.02

14.02

14.03

Rank

157

163

167

153

161

158

155

156

159

164

171

172

176

181

184

182

188

173

177

162

180

185

183

186

189

197

202

199

194

193

195

200

204

207

209

210

211

213

216

218

219

220

222

223

231

232

229

Prob. of Non- Exceed.

0.57

0.56

0.54

0.58

0.56

0.57

0.58

0.57

0.57

0.55

0.53

0.53

0.52

0.51

0.50

0.50

0.49

0.53

0.52

0.56

0.51

0.50

0.50

0.49

0.49

0.46

0.45

0.46

0.47

0.47

0.47

0.46

0.44

0.44

0.43

0.43

0.43

0.42

0.41

0.41

0.40

0.40

0.40

0.39

0.37

0.37

0.38

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 1 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentration s in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.31 cfs Average ground water concentration = 2870 ug/l Average surface water concentration = 11 ug/l

Max = M in =

16.51

12.59

Month

2

2

2

2

2

2

2

2

2

2

2

2

2

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

4

4

Day

17

18

19

20

21

22

23

24

25

26

27

28

29

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

Mean Flow Rate - DG

(cfs)

578

589

587

585

588

601

596

600

600

597

600

598

599

589

582

587

581

583

587

578

580

591

586

587

584

578

583

583

579

581

578

577

574

573

574

593

604

615

614

617

624

612

610

613

622

647

Mean Flow Rate - UG

{cfs)

293.6

302.2

300.6

299.0

301.4

311.6

307.7

310.8

310.8

308.4

310.8

309.2

310.0

302.2

296.7

300.6

295.9

297.5

300.6

293.6

295.1

303.7

299.8

300.6

298.3

293.6

297.5

297.5

294.3

295.9

293.6

292.8

290.4

289.7

290.4

305.3

313.9

322.5

321.7

324.1

329.6

320.2

318.6

321.0

328.0

347.6

Mixed Cone,

(ug/l )

14.02

13.93

13.95

13.96

13.94

13.84

13.88

13.85

13.85

13.87

13.85

13.86

13.86

13.93

13.98

13.95

13.99

13.98

13.95

14.02

14.00

13.91

13.95

13.95

13.97

14.02

13.98

13.98

14.01

13.99

14.02

14.02

14.05

14.06

14.05

13.90

13.82

13.75

13.75

13.73

13.69

13.77

13.78

13.76

13.70

13.55

Rank

233

254

249

247

253

266

258

263

264

259

265

260

262

255

242

250

240

243

251

234

239

256

248

252

246

235

244

245

237

241

236

230

226

225

227

257

267

274

273

275

281

270

269

271

279

300

Prob. of Non- Exceed.

0.37

0.31

0.32

0.33

0.31

0.28

0.30

0.28

0.28

0.29

0.28

0.29

0.29

0.31

0.34

0.32

0.35

0.34

0.32

0.36

0.35

0.30

0.32

0.31

0.33

0.36

0.34

0.33

0.35

0.34

0.36

0.37

0.38

0.39

0.38

0.30

0.27

0.25

0.26

0.25

0.23

0.26

0.27

0.26

0.24

0.18

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 2 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.31 cfs Average ground water concentration = 2870 ug/l Average surface water concentration = 11 ug/l

Max = M in =

16.51

12.59

Month

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

Day

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

.15

16

17

18

Mean Flow Rate - DG

(cfs)

631

619

613

620

622

627 !

 632

631

. 629

635

629

624

624

624

617

643

650

654

648

645

639

650

647

654

663

650

653

632

633

634

655

657

647

647

658

672

674

684

683

673

685

683

718

736

- 735

720

Mean Flo w Rate - UG

(cfs)

. 335.0

325.6

321.0

326.4

328.0

331.9

335.8

335.0

333.5

338.2

333.5

329.6

329.6

329.6

324.1

344.4

349.9

353.0

348.3

346.0

341.3

349.9

347.6

353.0

360.1

349.9

352.3

335.8

336.6

337.4

353.8

355.4

347.6

347.6

356.2

367.1

368.7

376.5

375.7

367.9

377.3

375.7

403.1

417.2

41.6.4

404.7

Mixed Cone,

(ug/l )

13.64

13.72

13.76

13.71

13.70

13.67

13.64

13.64

13.66

13.62

13.66

13.69

13.69

13.69

13.73

13.57

13.53

13.51

13.54

13.56

13.59

13.53

13.55

13.51

13.46

13.53

13.51

13.64

13.63

13.62

13.50

13.49

13.55

13.55

13.49

13.41

13.40

13.35

13.36

13.41

13.35

13.36

13.20

13.12

13.13

13.19

Rank

289

277

272

278

280

286

291

290

287

295

288

282

283

284

276

298

305

309

304

299

296

306

301

310

314

307

308

292

293

294

311

312

302

303

313

316

318

322

320

317

323

321

327

332

331

329

Prob. of Non - Exceed.

0.21

0.25

0.26

0.24

0.24

0.22

0.21

0.21

0.22

0.20

0.22

0.23

0.23

0.23

0.25

0.19

0.17

0.16

0.17

0.19

0.19

0.17

0.18

0.16

0.14

0.16

0.16

0.20

0.20

0.20

0.15

0.15

0.18

0.17

0.15

0.14

0.13

0.12

0.13

0.14

0.12

0.13

0.11

0.10

0.10

0.10

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 3 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentrations in the Jorda n River based on Mean of Dail y Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.31 cfs Average ground water concentration = 2870 ug/l Average surface water concentration = 11 ug/ l

Max = M in =16.51

12.59

Month

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

7

7

7

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG (cfs)

720

736

784

829

807

814

820

839

843

851

863

880

888

899

898

903

902

916

906

910

909

889

890

876

857

865

864

842

826

819

788

771

750

745

745

719

705

716

691

676

663

642

625

604

598

579

Mean Flow Rate - UG (cfs)

404.7

417.2

454.8

490.0

472.8

478.2

482.9

497.8

500.9

507.2

516.6

529.9

536.1

544.7

544.0

547.9

547.1

558.1

550.2

553.4

552.6

536.9

537.7

526.8

511.9

518.1

517.4

500.1

487.6

482.1

457.9

444.6

428.2

424.2

424.2

403.9

392.9

401.6

382.0

370.3

360.1

343.6

330.3

313.9

309.2

294.3

Mixed Cone,

(ug/l )

13.19

13.12

12.95

12.81

12.87

12.85

12.83

12.78

12.77

12.75

12.71

12.67

12.65

12.63

12.63

12.62

12.62

12.59

12.61

12.60

12.60

12.65

12.65

12.68

12.73

12.71

12.71

12.77

12.82

12.84

12.93

12.99

13.07

13.09

13.09

13.19

13.25

13.21

13.32

13.39

13.46

13.58

13.68

13.82

13.86

14.01

Rank

330

333

338

345

340

341

343

346

348

349

351

355

356

360

359

362

361

366

363

365

364

357

358

354

350

353

352

347

344

342

339

337

336

334

335

328

325

326

324

319

315

297

285

268

261

238

Prob. of Non- Exceed.

0.10

0.09

0.08

0.06

0.07

0.07

0.07

0.06

0.05

0.05

0.04

0.03

0.03

0.02

0.02

0.01

0.02

0.00

0.01

0.01

0.01

0.03

0.02

0.04

0.05

0.04

0.04

0.05

0.06

0.07

0.08

0.08

0.08

0.09

0.09

0.11

0.11

0.11

0.12

0.13

0.14

0.19

0.22

0.27

0.29

0.35

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

•0.0027

0.0027

0.0027!

0.0027

0.0027

0.0027

1

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 4 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentrations in the Jorda n River based on Mean of Daily Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.31 cfs Average ground water concentration = 2870 ug/l Average surface water concentration = 11 ug/l

Max = M in =16.51

12.59

Month

7

7

7

7

7

7

7

7

7

7

7

7

r

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

8

8

8

8

8

8

8

8

8

3

8

8

8

8

8

8

8

8

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs )

567

575

551

535

533

538

535

523

519

512

494

494

490

494

485

480

475

476

485

501

503

502

499

480

477

470

461

463

456

449

436

434

442

428

420

416

414

409

417

410

416

411

416

423

421

428

Mean Flow Rate - UG

(cfs)

285.0

291.2

272.4

 259.9

258.4

262.3

259.9

250.5

247.4

241.9

227.8

227.8

224.7

227.8

220.8

216.9

213.0

213.8

220.8

233.3

234.9

234.1

231.7

216.9

214.5

209.1

202.0

203.6

198.1

192.6

182.5

180.9

187.1

176.2

169.9

166.8

165.2

161.3

167.6

162.1

166.8

162.9

166.8

172.3

170.7

176.2

Mixed Cone,

(ug/l )

14.11

14.04

14.25

14.41

14.43

14.38

14.41

14.53

14.58

14.66

14.88

14.88

14.94

14.88

15.01

15.08

15.16

15.14

15.01

14.79

14.77

14.78

14.82

15.08

15.13

15.23

15.38

15.35

15.47

15.59

15.85

15.89

15.73

16.02

16.21

16.30

16.35

16.48

16.28

16.46

16.30

16.43

16.30

16.14

16.18

16.02

Rank

224

228

221

214

212

217

215

208

206

205

190

191

187

192

178

174

166

168

179

198

203

201

196

175

170

160

142

147

134

108

54

51

72

41

25

14

8

2

20

4

15

5

16

35

27

42

Prob. of Non - Exceed.

0.39

0.38

0.40

0.42

0.42

0.41

0.41

0.43

0.44

0.44

0.48

0.48

0.49

0.48

0.51

0.53

0.55

0.54

0.51

0.46

0.45

0.45

0.47

0.52

0.54

0.56

0.61

0.60

0.63

0.71

0.85

0.86

0.80

0.89

0.93

0.96

0.98

0.99

0.95

0.99

0.96

0.99

0.96

0.90

0.93

0.89

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 5 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.31 cfs Average ground water concentration = 2870 ug/l Average surface water concentration = 11 ug/ l

Max = M in =

16.51

12.59

Month

8

&

8

8

8

8

8

8

8

8

8

8

8

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

10

10

10

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

L_

 13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG

(cfs)

440

440

443

440

427

421

421

422

422

416

415

412

419

408

414

421

421

426

446

440

446

442

452

454

447

438

431

428

425

427

446

445

435

439

441

457

443

450

456

467

461

447

451

454

450

457

Mean Flo w Rate - UG

(Cfs)

185.6

185.6

187.9

185.6

175.4

170.7

170.7

171.5

171.5

166.8

166.0

163.7

169.1

160.5

165.2

170.7

170.7

174.6

190.3

185.6

190.3

187.1

195.0

196.5

191.1

184.0

178.5

176.2

173.8

175.4

190.3

189.5

181.7

184.8

186.4

198.9

187.9

193.4

198.1

206.7

202.0

191.1

194.2

196.5

193.4

198.9

Mixed Cone. (ug/i)

15.77

15.77

15.71

15.77

16.04

16.18

16.18

16.16

16.16

16.30

16.33

16.40

16.23

16.51

16.35

16.18

16.18

16.07

15.65

15.77

15.65

15.73

15.54

15.50

15.63

15.81

15.96

16.02

16.09

16.04

15.65

15.67

15.87

15.79

15.75

15.45

15.71

15.58

15.47

15.28

15.38

15.63

15.56

15.50

15.58

15.45

Rank

61

62

80

63

39

28

29

32

33

17

10

6

22

1

9

30

31

37

88

64

89

73

122

128

95

57

44

43

36

40

90

84

52

59

68

136

81

113

135

154

143

96

118

129

114

137

Prob. of Non - Exceed.

0.83

0.83

0.78

0.83

0.89

0.92

0.92

0.91

0.91

0.95

0.97

0.98

0.94

1.00

0.98

0.92

0.92

0.90

0.76

0.83

0.76

. 0.80

0.67

0.65

0.74

0.84

0.88

0.88

0.90

0.89

0.75

0.77

0.86

0.84

0.81

0.63

0.78

0.69

0.63

0.58

0.61

0.74

0.68

0.65

0.69

0.63

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 6 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentration s in the Jorda n River based on Mean of Dail y Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.31 cfs Average ground water concentration = 2870 ug/ l Average surface water concentration = 11 ug/ l

Max = M in =16.51

12.59

Month

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs)

457

450

448

462

461

450

454

458

463

452

464

465

455

426

419

422

420

415

419

412

415

409

417

431

415

416

432

438

431

443

431

416

432

432

435

446

440

439

440

442

442

444

442

441

437

441

Mean Flow Rate - UG

(cfs)

198.9

193.4

191.8

202.8

202.0

193.4

196.5

199.7

203.6

195.0

204.4

205.1

197.3

174.6

169.1

171.5

169.9

166.0

169.1

163.7

166.0

161.3

167.6

178.5

166.0

166.8

179.3

184.0

178.5

187.9

178.5

166.8

179.3

179.3

181.7

190.3

185.6

184.8

185.6

187.1

187.1

188.7

187.1

186.4

183.2

186.4

Mixed Cone,

(ug/l )

15.45

15.58

15.61

15.36

15.38

15.58

15.50

15.43

15.35

15.54

15.33

15.31

15.48

16.07

16.23

16.16

16.21

16.33

16.23

16.40

16.33

16.48

16.28

15.96

16.33

16.30

15.93

15.81

15.96

15.71

15.96

16.30

15.93

15.93

15.87

15.65

15.77

15.79

15.77

15.73

15.73

15.69

15.73

15.75

15.83

15.75

Rank

138

115

102

145

144

116

130

140

148

123

150

152

132

38

23

34

26

11

24

7

12

3

21

45

13

18

48

58

46

82

47

19

49

50

53

91

65

60

66

74

75

83

76

69

56

70

Prob. of Non - Exceed.

0.62

0.69

0.72

0.60

0.61

0.68

0.65

0.62

0.60

0.66

0.59

0.59

0.64

0.90

0.94

0.91

0.93

0.97

0.93

0.98

0.97

0.99

0.94

0.88

0.96

0.95

0.87

0.84

0.87

0.78

0.87

0.95

0.87

0.86

0.86

0.75

0.82

0.84

0.82

0.80

0.80

0.77

0.79

0.81

0.85

0.81

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 7 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Arsenic Concentrations in the Jorda n River based on Mean of Dail y Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.31 cfs Average ground water concentration = 2870 ug/ l Average surface water concentration = 11 ug/ l

M ax =16.51 Min = 12.59

Month

11

11

11

11

11

11

11

11

11

11

11

11

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

Day

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Mean Flow Rate - DG

(cfs)

441

436

440

442

442

445

450

442

448

449

448

447

448

447

445

451

445

447

451

452

448

448

455

449

452

449

457

453

449

447

447

446

446

446

451

454

453

459

463

462

464

476

474

Mean Flow Rate - UG

(cfs)

186.4

182.5

185.6

187.1

187.1

189.5

193.4

187.1

191.8

192.6

191.8

191.1

191.8

191.1

189.5

194.2

189.5

191.1

194.2

195.0

191.8

191.8

197.3

192.6

195.0

192.6

198.9

195.8

192.6

191.1

191.1

190.3

190.3

190.3

194.2

196.5

195.8

200.4

203.6

202.8

204.4

213.8

212.2

Mixed Cone,

(ug/l )

15.75

15.85

15.77

15.73

15.73

15.67

15.58

15.73

15.61

15.59

15.61

15.63

15.61

15.63

15.67

15.56

15.67

15.63

15.56

15.54

15.61

15.61

15.48

15.59

15.54

15.59

15.45

15.52

15.59

15.63

15.63

15.65

15.65

15.65

15.56

15.50

15.52

15.41

15.35

15.36

15.33

15.14

15.17

Rank

71

55

67

77

78

85

117

79

103

109

104

97

105

98

86

119

87

99

120

124

106

107

133

110

125

1 11

139

126

1 12

100

101

92

93

94

121

131

127

141

149

146

151

169

165

Prob. of Non - Exceed.

0.81

0.85

0.82

0.79

0.79

0.77

0.68

0.78

0.72

0.70

0.72

0.74

0.71

0.73

0.77

0.68

0.76

0.73

0.67

0.66

0.71

0.71

0.64

0.70

0.66

0.70

0.62

0.66

0.69

0.73

0.72

0.75

0.75

0.74

0.67

0.64

0.65

0.62

0.59

0.60

0.59

0.54

0.55

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: As Summary Page 8 of 8
600

55.0

Estimated Mean of Mean Dail y Flow Rates and Predicted Cadmium Concentration s in the Jorda n River

with Groundwater Discharge at 1560 ug/l Midvale Slag OU 2

Jorda n River Mean Flo w

Cd Concentration

100 0.00

CD

File : StatSig.xl s Page: Cd Cone. & Flo w9/24/2002 Page 1 of 1
Estimated Cadmium Concentrations in the Jorda n River at Mean Dail y Flo w Rate Probabilit y of Non-Exceedance with Groundwater Discharge at 1560 ug/l

and Upstream Concentration at 0.9 ug/l

1.00

0.90

0.10

0.00

1.00 1.10 1.20 1.30 1.40

Concentration (ug/l )

1.50 1.60 1.70

File: StatSig.xl s Page: Cd Prob.

9/24/2002 Page 1 of 1
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.072 cfs Average ground water concentration = 1560 ug/l Average surface water concentration = 0.9 ug/l

Max = M in =

1.60

1.10

Month

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

Day

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

• 9

10

11

12

13

14

15

16

Mean Flow Rate - DG

(cfs)

470

474

476

467

471

470

468

469

470

474

479

480

481

487

488

487

493

480

481

472

486

488

487

488

494

501

503

502

498

497

499

502

506

522

527

531

533

534

536

540

543

550

560

567

578

578

576

Mean Flow Rate - UG

(cfs)

209.1

212.2

213.8

206.7

209.8

209.1

207.5

208.3

209.1

212.2

216.1

216.9

217.7

222.4

223.1

222.4

227.1

216.9

217.7

210.6

221.6

223.1

222.4

223.1

227.8

233.3

234.9

234.1

231.0

230.2

231.7

234.1

237.2

- 249.7

253.7

256.8

258.4

259.1

260.7

263.8

266.2

271.7

279.5

285.0

293.6

293.6

292.0

Mixed Cone,

(ug/l )

1.44

1.43

1.42

1.44

1.43

1.44

1.44

1.44

1.44

1.43

1.42

1.42

1.42

1.40

1.40

1.40

1.39

1.42

1.42

1.43

1.41

1.40

1.40

1.40

1.39

1.38

1.38

1.38

1.39

1.39

1.38

1.38

1.37

1.35

1.34

1.34

1.33

1.33

1.33

1.33

1.32

1.31

1.30

1.29

1.28

1.28

1.28

Rank

157

163

167

153

161

158

155

156

159

164

171

172

176

181

184

182

188

173

177

162

180

185

183

186

189

197

202

199

194

193

195

200

204

207

209

210

211

213

216

218

219

220

222

223

231

232

229

Prob. of Non- Exceed.

0.57

0.56

0.54

0.58

0.56

0.57

0.58

0.57

0.57

0.55

0.53

0.53

0.52

0.51

0.50

0.50

0.49

0.53

0.52

0.56

0.51

0.50

0.50

0.49

0.49

0.46

0.45

0.46

0.47

0.47

0.47

0.46

0.44

0.44

0.43

0.43

0.43

0.42

0.41

0.41

0.40

0.40

0.40

0.39

0.37

0.37

0.38

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 1 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = Average ground water concentration = Average surface water concentration =

0.072 cfs

1560 ug/ l

0.9 ug/ l

Max= 1.60 Min = 1.10

Month

2

2

2

2

2

2

2

2

2

2

2

2

2

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

4

4

Day

17

18

19

20

21

22

23

24

25

26

27

28

29

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

Mean Flow Rate - DG

(cfs)

578

589

587

585

588

601

596

600

600

597

600

598

599

589

582

587

581

583

587

578

580

591

586

587

584

578

583

583

579

581

578

577

574

573

574

593

604

615

614

617

624

612

610

613

622

647

Mean Flow Rate - UG

(Cfs )

293.6

302.2

300.6

299.0

301.4

311.6

307.7

310.8

310.8

308.4

310.8

309.2

310.0

302.2

296.7

300.6

295.9

297.5

300.6

293.6

295.1

303.7

299.8

300.6

298.3

293.6

297.5

297.5

294.3

295.9

293.6

292.8

290.4

289.7

290.4

305.3

313.9

322.5

321.7

324.1

329.6

320.2

318.6

321.0

328.0

347.6

Mixed Cone. (ug/l )

1.28

1.27

1.27

1.28

1.27

1.26

1.26

1.26

1.26

1.26

1.26

1.26

1.26

1.27

1.28

1.27

1.28

1.28

1.27

1.28

1.28

1.27

1.27

1.27

1.28

1.28

1.28

1.28

1.28

1.28

1.28

1.28

1.29

1.29

1.29

1.27

1.26

1.25

1.25

1.25

1.24

1.25

1.25

1.25

1.24

1.22

Rank

233

254

249

247

253

266

258

263

264

259

265

260

262

255

242

250

240

243

251

234

239

256

248

252

246

235

244

245

237

241

236

230

226

225

227

257

267

274

273

275

281

270

269

271

279

300

Prob. of Non - Exceed.

0.37

0.31

0.32

0.33

0.31

0.28

0.30

0.28

0.28

0.29

0.28

0.29

0.29

0.31

0.34

0.32

0.35

0.34

0.32

0.36

0.35

0.30

0.32

0.31

0.33

0.36

0.34

0.33

0.35

0.34

0.36

0.37

0.38

0.39

0.38

0.30

0.27

0.25

0.26

0.25

0.23

0.26

0.27

0.26

0.24

0.18

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 2 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentration s in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.072 cfs Average ground water concentration = 1560 ug/ l Average surface water concentration = 0.9 ug/ l

Max = M in =

1.60

1.10

Month

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

Day

3

4

5

6

7

8

 9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG (cfs)

631

619

613

620

622

627

632

631

629

635

629

624

624

624

617

643

650

654

648

645

639

650

647

654

663

650

653

632

633

634

655

657

647

647

658

672

674

684

683

673

685

683

718

736

735

720

Mean Flow Rate - UG

(cfs)

335.0

325.6

321.0

326.4

328.0

331.9

335.8

335.0

333.5

338.2

333.5

329.6

329.6

329.6

324.1

344.4

349.9

353.0

348.3

346.0

341.3

349.9

347.6

353.0

360.1

349.9

352.3

335.8

336.6

337.4

353.8

355.4

347.6

347.6

356.2

367.1

368.7

376.5

375.7

367.9

377.3

375.7

403.1

417.2

416.4

404.7

Mixed Cone.

(ug/l)

1.23

1.24

1.25

1.24

1.24

1.24

1.23

1.23

1.24

1.23

1.24

1.24

1.24

1.24

1.25

1.23

1.22

1.22

1.22

1.22

1.23

1.22

1.22

1.22

1.21

1.22

1.22

1.23

1.23

1.23

1.22

1.22

1.22

1.22

1.22

1.21

1.20

1.20

1.20

1.21

1.20

1.20

1.18

1.17

1.17

1.18

Rank

289

277

272

278

280

286

291

290

287

295

288

282

283

284

276

298

305

309

304

299

296

306

301

310

314

307

308

292

293

294

311

312

302

303

313

316

318

322

320

317

323

321

327

332

331

329

Prob. of Non - Exceed.

0.21

0.25

0.26

0.24

0.24

0.22

0.21

0.21

0.22

0.20

0.22

0.23

0.23

0.23

0.25

0.19

0.17

0.16

0.17

0.19

0.19

0.17

0.18

0.16

0.14

0.16

0.16

0.20

0.20

0.20

0.15

0.15

0.18

0.17

0.15

0.14

0.13

0.12

0.13

0.14

0.12

0.13

0.11

0.10

0.10

0.10

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 3 of 8

IIIIIIIIIIIIIIIIII

1
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentration s in the Jorda n River based on Mean of Daily Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.072 cfs Average ground water concentration = 1560 ug/l Average surface water concentration = 0.9 ug/l

Max = Min-=1.60

1.10

Month

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

7

7

7

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG

(cfs)

720

736

784

829

807

814

820

839

843

851

863

880

888

899

898

903

902

916

906

910

909

889

890

876

857

865

864

842

826

819

788

771

750

745

745

719

705

716

691

676

663

642

625

604

598

579

Mean Flo w Rate - UG

(cfs )

404.7

417.2

454.8

490.0

472.8

478.2

482.9

497.8

500.9

507.2

516.6

529.9

536.1

544.7

544.0

547.9

547.1

558.1

550.2

553.4

552.6

536.9

537.7

526.8

511.9

518.1

517.4

500.1

487.6

482.1

457.9

444.6

428.2

424.2

424.2

403.9

392.9

401.6

382.0

370.3

360.1

343.6

330.3

313.9

309.2

294.3

Mixed Cone,

(ug/l )

1.18

1.17

1.15

1.13

1.14

1.13

1.13

1.13

1.12

1.12

1.12

1.11

1.11

1.11

1.11

1.10

1.11

1.10

1.10

1.10

1.10

1.11

1.11

1.11

1.12

1.12

1.12

1.12

1.13

1.13

1.15

1.15

1.16

1.16

1.16

1.18

1.19

1.18

1.19

1.20

1.21

1.23

1.24

1.26

1.26

1.28

Rank

330

333

338

345

340

341

343

346

348

349

351

355

356

360

359

362

361

366

363

365

364

357

358

354

350

353

352

347

344

342

339

337

336

334

335

328

325

326

324

319

315

297

285

268

261

238

Prob. of Non - Exceed.

0.10

0.09

0.08

0.06

0.07

0.07

0.07

0.06

0.05

0.05

0.04

0.03

0.03

0.02

0.02

0.01

0.02

0.00

0.01

0.01

0.01

0.03

0.02

0.04

0.05

0.04

0.04

0.05

0.06

0.07

0.08

0.08

0.08

0.09

0.09

0.11

0.11

0.11

0.12

0.13

0.14

0.19

0.22

0.27

0.29

0.35

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 4 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentration s in the Jorda n River based on Mean of Dail y Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = Average ground water concentration = Average surface water concentration =

0.072 cfs

1560 ug/ l

0.9 ug/ l

Max= 1.60 M in = 1.10

Montn

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG (cfs)

567

575

551

535

533

538

535

523

519

512

494

494

490

494

485

480

475

476

485

501

503

502

499

480

477

470

461

463

456

449

436

434

442

428

420

416

414

409

417

410

416

411

416

423

421

428

Mean Flow Rate - UG

(cfs )

285.0

. 291.2

272.4

259.9

258.4

262.3

259.9

250.5

247.4

241.9

227.8

227.8

224.7

227.8

220.8

216.9

213.0 h

 213.8

220.8

233.3

234.9

234.1

231.7

216.9

214.5

209.1

202.0

203.6

198.1

192.6

182.5

180.9

187.1

176.2

169.9

166.8

165.2

161.3

167.6

162.1

166.8

162.9

166.8

172.3

170.7

176.2

Mixed Cone,

(ug/l )

1.29

1.29

1.31

1.33

1.33

1.33

1.33

1.35

1.35

1.36

1.39

1.39

1.40

1.39

1.41

1.42

1.43

1.42

1.41

1.38

1.38

1.38

1.38

1.42

1.42

1.44

1.46

1.45

1.47

1.48

1.52

1.52

1.50

1.54

1.56

1.57

1.58

1.60

1.57

1.59

1.57

1.59

1.57

1.55

1.56

1.54

Rank

224

228

221

214

212

217

215

208

206

205

190

191

187

192

178

174

166

168

179

198

203

201

196

175

170

160

142

147

134

108

54

51

72

41

25

14

8

2

20

4

15

5

16

35

27

42

Prob. of Non - Exceed.

0.39

0.38

0.40

0.42

0.42

0.41

0.41

0.43

0.44

0.44

0.48

0.48

0.49

0.48

0.51

0.53

0.55

0.54

0.51

0.46

0.45

0.45

0.47

0.52

0.54

0.56

0.61

0.60

0.63

0.71

0.85

0.86

0.80

0.89

0.93

0.96

0.98

0.99

0.95

0.99

0.96

0.99

0.96

0.90

0.93

0.89

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 5 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = Average ground water concentration = Average surface water concentration =

0.072 cfs

1560 ug/l

0.9 ug/l

Max= 1.60 Min = 1.10

Month

8

8

8

8

8

8

8

8

8

8

8

8

8

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

g

9

9

9

9

9

9

9

9

9

9

9

9

9

10

10

10

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG

(cfs )

440

440

443

440

427

421

421

422

422

416

415

412

419

408

414

421

421

426

446

440

446

442

452

454

447

438

431

428

425

427

446

445

435

439

441

457

443

450

456

467

461

447

451

454

450

457

Mean Flow Rate - UG

(cfs)

185.6

185.6

187.9

185.6

175.4

170.7

170.7

171.5

171.5

166.8

166.0

163.7

169.1

160.5

165.2

170.7

170.7

174.6

190.3

185.6

190.3

187.1

195.0

196.5

191.1

184.0

178.5

176.2

173.8

175.4

190.3

189.5

181.7

184.8

186.4

198.9

187.9

193.4

198.1

206.7

202.0

191.1

194.2

196.5

193.4

198.9

Mixed Cone,

(ufl/l )

1.50

1.50

1.50

1.50

1.54

1.56

1.56

1.55

1.55

1.57

1.58

1.59

1.56

1.60

1.58

1.56

1.56

1.54

1.49

1.50

1.49

1.50

1.48

1.47

1.49

1.51

1.53

1.54

1.55

1.54

1.49

1.49

1.52

1.51

1.50

1.46

1.50

1.48

1.47

1.44

1.46

1.49

1.48

1.47

1.48

1.46

Rank

61

62

80

63

39

28

29

32

33

17

10

6

22

1

9

30

31

37

88

64

89

73

122

128

95

57

44

43

36

40

90

84

52

59

68

136

81

113

135

154

143

96

118

129

114

137

Prob. of Non- Exceed.

0.83

0.83

0.78

0.83

0.89

0.92

0.92

0.91

0.91

0.95

0.97

0.98

0.94

1.00

0.98

0.92

0.92

0.90

0.76

0.83

0.76

0.80

0.67

0.65

0.74

0.84

0.88

0.88

0.90

0.89

0.75

0.77

0.86

0.84

0.81-

0.63

0.78

0.69

0.63

0.58

0.61

0.74

0.68

0.65

0.69

0.63

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 6 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentrations in the Jorda n River based on Mean of Dail y Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.072 cfs Average ground water concentration = 1560 ug/l Average surface water concentration = 0.9 ug/l

M ax = M in =1.60

1.10

Month

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs)

457

450

448

462

461

450

454

458

463

452

464

465

455

426

419

422

420

415

419

412

415

409

417

431

415

416

432

438

431

443

431

416

432

432

435

446

440

439

440

442

442

444

442

441

437

441

Mean Flo w Rate - UG

(cfs)

198.9

193.4

191.8

202.8

202.0

193.4

196.5

199.7

203.6

195.0

204.4

205.1.

197.3

174.6

169.1

171.5

169.9

166.0

169.1

163.7

166.0

161.3

167.6

178.5

166.0

166.8

179.3

184.0

178.5

187.9

178.5

166.8

179.3

179.3

181.7

190.3

185.6

184.8

185.6

187.1

187.1

188.7

187.1

186.4

183.2

186.4

Mixed Cone,

(ug/l )

1.46

1.48

1.48

'1.4 5

1.46

1.48

1.47

1.46

1.45

1.48

1.45

1.45

1.47

1.54

1.56

1.55

1.56

1.58

1.56

1.59

1.58

1.60

1.57

1.53

1.58

1.57

1.53

1.51

1.53

1.50

1.53

1.57

1.53

1.53

1.52

1.49

1.50

1.51

1.50

1.50

1.50

1.49

1.50

1.50

1.51

1.50

Rank

138

1 15

102

145

144

116

130

140

148

123

150

152

132

38

23

34

26

11

24

7

12

3

21

45

13

18

48

58

46

82

47

19

49

50

53

91

65

60

66

74

75

83

76

69

56

70

Prob. of Non- Exceed.

0.62

0.69

0.72

0.60

0.61

0.68

0.65

0.62

0.60

0.66

0.59

0.59

0.64

0.90

0.94

0.91

0.93

0.97

0.93

0.98

0.97

0.99

0.94

0.88

0.96

0.95

0.87

0.84

0.87

0.78

0.87

0.95

0.87

0.86

0.86

0.75

0.82

0.84

0.82

0.80

0.80

0.77

0.79

0.81

0.85

0.81

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 7 of 8

IIIIIIIIIIIIIIIIIII
COM

Midvale Slag OU2

3282-986-FSZ-DGRCZ

Estimated Cadmium Concentration s in the Jorda n River based on Mean of Daily Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = Average ground water concentration = Average surface water concentration =

0.072 cfs

1560 ug/ l

0.9 ug/ l

Max= 1.60 Min = 1.10

Month

11

11

11

11

11

11

11

11

11

11

11

11

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

Day

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Mean Flow Rate - DG

(cfs)

441

436

440

442

442

445

450

442

448

449

448

447

448

447

445

451

445

447

451

452

448

448

455

449

452

449

457

453

449

447

447

446

446

446

451

454

453

459

463

462

464

476

474

Mean Flo w Rate - UG

(cfs)

186.4

182.5

185.6

187.1

187.1

189.5

193.4

187.1

191.8

192.6

191.8

191.1

191.8

191.1

189.5

194.2

189.5

191.1

194.2

195.0

191.8

191.8

197.3

192.6

195.0

192.6

198.9

195.8

192.6

191.1

191.1

190.3

190.3

190.3

194.2

196.5

195.8

200.4

203.6

202.8

204.4

213.8

212.2

Mixed Cone,

(ug/l )

1.50

1.52

1.50

1.50

1.50

1.49

1.48

1.50

1.48

1.48

1.48

1.49

1.48

1.49

1.49

1.48

1.49

1.49

1.48

1.48

1.48

1.48

1.47

1.48

1.48

1.48

1.46

1.47

1.48

1.49

1.49

1.49

1.49

1.49

1.48

1.47

1.47

1.46

1.45

1.45

1.45

1.42

1.43

Rank

71

55

67

77

78

85

117

79

103

109

104

97

105

98

86

119

87

99

120

124

106

107

133

110

125

1 11

139

126

112

100

101

92

93

94

121

131

127

141

149

146

151

169

165

Prob. of Non - Exceed.

0.81

0.85

0.82

0.79

0.79

0.77

0.68

0.78

0.72

0.70

0.72

0.74

0.71

0.73

0.77

0.68

0.76

0.73

0.67

0.66

0.71

0.71

0.64

0.70

0.66

0.70

0.62

0.66

0.69

0.73

0.72

0.75

0.75

0.74

0.67

0.64

0.65

0.62

0.59

0.60

0.59

0.54

0.55

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Cd Summary Page 8 of 8
Estimated Mean of Mean Dail y Flow Rates an d Predicted Selenium Concentration s in the Jorda n River

with Groundwater Discharge at 900 ug/l Midvale Slag OU 2

Jorda n River Mean Flow

Se Concentration

100

3.00

-- 2.50

-- 2.00

o>

c

o

1.50

c

0)

o

c

o

o

1.00

0.50

0.00

Day

File: StatSig.xl s Page: Se Cone. & Flow

9/24/2002 Page 1 of 1
Estimated Selenium Concentration s in the Jorda n River at Mean Dail y Flo w Rate Probabilit y of Non-Exceedance with Ground water Discharge at 900 ug/ l

and Upstream Concentration at 1.9 ug/ l

1.00

0.90

0.10

0.00

2.10 2.20 2.30 2.40 2.50

Concentration (ug/l )

2.60 2.70 2.80

File . StatSig.xl s Page: Se Prob.

9/24/2002 Page 1 of 1
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentrations in the Jorda n River based on Mean of Dail y Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.144 cfs Average ground water concentration = 900 ug/ l Average surface water concentration = 1.9 ug/ l

Max= 2.70 Min = 2.13

Month

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

Day

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

, 16

Mean Flow Rate - DG

(cfs)

470

474

476

467

471

470

468

469

470

474

479

480

481

487

488

487

493

480

481

472

486

488

487

488

494

501

503

502

498

497

499

502

506

522

527

531

533

534

536

540

543

550

560

567

578

578

576

Mean Flow Rate - UG

(cfs)

209.1

212.2

213.8

206.7

209.8

209.1

207.5

208.3

209.1

212.2

216.1

216.9

217.7

222.4

223.1

222.4

227.1

216.9

217.7

210.6

221.6

223.1

222.4

223.1

227.8

233.3

234.9

234.1

231.0

230.2

231.7

234.1

237.2

249.7

253.7

256.8

258.4

259.1

260.7

263.8

266.2

271.7

279.5

285.0

293.6

293.6

292.0

Mixed Cone.

(ug/D

2.52

2.51

2.50

2.53

2.52

2.52

2.52

2.52

2.52

2.51

2.50

2.50

2.49

2.48

2.48

2.48

2.47

2.50

2.49

2.51

2.48

2.48

2.48

2.48

2.47

2.45

2.45

2.45

2.46

2.46

2.46

2.45

2.44

2.42

2.41

2.40

2.40

2.40

2.40

2.39

2.39

2.38

2.36

2.35

2.34

2.34

2.34

Rank

157

163

167

153

161

158

155

156

159

164

171

172

176

181

184

182

188

173

177

162

180

185

183

186

189

197

202

199

194

193

195

200

204

207

209

210

2 11

213

216

218

219

220

222

223

231

232

229

Prob. of Non- Exceed.

0.57

0.56

0.54

0.58

0.56

0.57

0.58

0.57

0.57

0.55

0.53

0.53

0.52

0.51

0.50

0.50

0.49

0.53

0.52

0.56

0.51

0.50

0.50

0.49

0.49

0.46

0.45

0.46

0.47

0.47

0.47

0.46

0.44

0.44

0.43

0.43

0.43

0.42

0.41

0.41

0.40

0.40

0.40

0.39

0.37

0.37

0.38

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Se Summary Page 1 of 8
COM

Midvale Slag OU2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentration s in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.144 cfs Average ground water concentration = 900 ug/l Average surface water concentration = 1.9 ug/l

Max= 2.70 Min = 2.13

Month

2

2

2

2

2

2

2

2

2

2

2

2

2

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

4

4

Day

17

18

19

20

21

22

23

24

25

26

27

28

29

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

Mean Flo w Rate - DG

(cfs )

578

589

587

585

588

601

596

600

600

597

600

598

599

589

582

587

581

583

587

578

580

591

586

587

584

578

583

. 583

579

581

578

577

574

573

574

593

604

615

614

617

624

612

610

613

622

647

Mean Flo w Rate - UG (cfs )

293.6

302.2

300.6

299.0

301.4

311.6

307.7

310.8

310.8

308.4

310.8

309.2

310.0

302.2

296.7

300.6

295.9

297.5

300.6

293.6

295.1

303.7

299.8

300.6

298.3

293.6

297.5

297.5

294.3

295.9

293.6

292.8

290.4

289.7

290.4

305.3

313.9

322.5

321.7

324.1

329.6

320.2

318.6

321.0

328.0

347.6

Mixed Cone.

(ug/l)

2.34

2.33

2.33

2.33

2.33

2.31

2.32

2.32

2.32

2.32

2.32

2.32

2.32

2.33

2.34

2.33

2.34

2.33

2.33

2.34

2.34

2.33

2.33

2.33

2.33

2.34

2.33

2.33

2.34

2.34

2.34

2.34

2.35

2.35

2.35

2.32

2.31

2.30

2.30

2.30

2.29

2.30

2.31

2.30

2.29

2.27

Rank

233

254

249

247

253

266

258

263

264

259

265

260

262

255

242

250

240

243

251

234

239

256

248

252

246

235

244

245

237

241

236

230

226

225

227

257

267

274

273

275

281

270

269

271

279

300

Prob. of Non- Exceed.

0.37

0.31

0.32

0.33

0.31

0.28

0.30

0.28

0.28

0.29

0.28

0.29

0.29

0.31

0.34

0.32

0.35

0.34

0.32

0.36

0.35

0.30

0.32

0.31

0.33

0.36

0.34

0.33

0.35

0.34

0.36

0.37

0.38

0.39

0.38

0.30

0.27

0.25

0.26

0.25

0.23

0.26

0.27

0.26

0.24

0.18

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Se Summary Page 2 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentrations in the Jorda n River based on Mean of Dail y Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.144 cfs Average ground water concentration = 900 ug/l Average surface water concentration = 1.9 ug/l

Max = M in =

2.70

2.13

Month

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

.5

5

5

Day

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs)

631

619

613

620

622

627

632

631

629

635

629

624

624

624

617

643

650

654

648

645

639

650

647

654

663

650

653

632

633

634

655

657

647

647

658

672

674

684

683

673

685

683

718

736

735

720

Mean Flow Rate - UG

(cfs)

335.0

325.6

321.0

326.4

328.0

331.9

335.8

335.0

333.5

338.2

333.5

329.6

329.6

329.6

324.1

344.4

349.9

353.0

348.3

346.0

341.3

349.9

347.6

353.0

360.1

349.9

352.3

335.8

336.6

337.4

353.8

355.4

347.6

347.6

356.2

367.1

368.7

376.5

375.7

367.9

377.3

375.7

403.1

417.2

416.4

404.7

Mixed Cone,

(ug/l )

2.29

2.30

2.30

2.30

2.29

2.29

2.28

2.29

2.29

2.28

2.29

2.29

2.29

2.29

2.30

2.28

2.27

2.27

2.27

2.27

2.28

2.27

2.27

2.27

2.26

2.27

2.27

2.28

2.28

2.28

2.27

2.26

2.27

2.27

2.26

2.25

2.25

2.24

2.24

2.25

2.24

2.24

2.22

2.21

2.21

2.22

Rank

289

277

272

278

280

286

291

290

287

295

288

282

283

284

276

298

305

309

304

299

296

306

301

310

314

307

308

292

293

294

311

312

302

303

313

316

318

322

320

317

323

321

327

332

331

329

Prob. of Non- Exceed.

0.21

0.25

0.26

0.24

0.24

0.22

0.21

0.21

0.22

0.20

0.22

0.23

0.23

0.23

0.25

0.19

0.17

0.16

0.17

0.19

0.19

0.17

0.18

0.16

0.14

0.16

0.16

0.20

0.20

0.20

0.15

0.15

0.18

0.17

0.15

0.14

0.13

0.12

0.13

0.14

0.12

0.13

0.11

0.10

0.10

0.10

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Se Summary Page 3 of 8

III

1IIIIIIIIIIIIIII
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.144 cfs Average ground water concentration = 900 ug/l Average surface water concentration = 1.9 ug/l

Max= 2.70 Min = 2.13

Month

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

7

7

7

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG (cfs)

720

736

784

829

807

814

820

839

843

851

863

880

888

899

898

903

902

916

906

910

909

889

890

876

857

865

864

842

826

819

788

771

750

745

745

719

705

716

691

676

663

642

625

604

598

579

Mean Flo w Rate - UG

(cfs )

404.7

417.2

454.8

490.0

472.8

478.2

482.9

497.8

500.9

507.2

516.6

529.9

536.1

544.7

544.0

547.9

547.1

558.1

550.2

553.4

552.6

536.9

537.7

526.8

511.9

518.1

517.4

500.1

487.6

482.1

457.9

444.6

428.2

424.2

424.2

403.9

392.9

401.6

382.0

370.3

360.1

343.6

330.3

313.9

309.2

294.3

Mixed Cone,

(ug/l )

2.22

2.21

2.18

2.16

2.17

2.17

2.17

2.16

2.16

2.15

2.15

2.14

2.14

2.14

2.14

2.14

2.14

2.13

• 2.13

2.13

2.13

2.14

2.14

2.15

2.15

2.15

2.15

2.16

2.17

2.17

2.18

2.19

2.20

2.20

2.20

2.22

2.23

2.22

2.24

2.25

2.26

2.28

2.29

2.31

2.32

2.34

Rank

330

333

338

345

340

341

343

346

- 348

349

351

355

356

360

359

362

361

366

363

365

364

357

358

354

350

353

352

347

344

342

339

337

336

334

335

328

325

326

324

319

315

297

285

268

261

238

Prob. of Non - Exceed.

0.10

0.09

0.08

0.06

0.07

0.07

0.07

0.06

0.05

0.05

0.04

0.03

0.03

0.02

0.02

0.01

0.02

0.00

0.01

0.01

0.01

0.03

0.02

0.04

0.05

0.04

0.04

0.05

0.06

0.07

0.08

0.08

0.08

0.09

0.09

0.11

0.11

0.11

0.12

0.13

0.14

0.19

0.22

0.27

0.29

0.35

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0:0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

t

File: StatSig.xl s Sheet: Se Summary Page 4 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentration s in the Jorda n River based on Mean of Dail y Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.144 cfs Average ground water concentration = 900 ug/l Average surface water concentration = 1.9 ug/l

Max= 2.70 M in = 2.13

Month

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs )

567

575

551

535

533

538

535

523

519

512

494

494

490

494

485

480

475

476

485

501

503

502

499

480

477

470

461

463

456

449

436

434

442

428

420

416

414

409

417

410

416

411

416

423

421

428

Mean Flow Rate - UG

(cfs)

285.0

291.2

272.4

259.9

258.4

262.3

259.9

250.5

247.4

241.9

227.8

227.8

224.7

227.8

220.8

216.9

213.0

213.8

220.8

233.3

234.9

234.1

231.7

216.9

214.5

209.1

202.0

203.6

198.1

192.6

182.5

180.9

187.1

176.2

169.9

166.8

165.2

161.3

167.6

162.1

166.8

162.9

166.8

172.3

170.7

176.2

Mixed Cone,

(ug/l )

2.35

2.34

2.37

2.40

2.40

2.39

2.40

2.42

2.42

2.43

2.47

2.47

2.48

2.47

2.49

2.50

2.51

2.50

2.49

2.45

2.45

2.45

2.46

2.50

2.50

2.52

2.54

2.53

2.55

2.57

2.61

2.61

2.59

2.63

2.66

2.67

2.68

2.70

2.67

2.70

2.67

2.69

2.67

2.65

2.66

2.63

Rank

224

228

221

214

212

217

215

208

206

205

190

191

187

192

178

174

166

168

179

198

203

201

196

175

170

160

142

147

134

108

54

51

72

41

25

14

8

2

20

4

15

5

16

35

27

42

Prob. of Non- Exceed.

0.39

0.38

0.40

0.42

0.42

0.41

0.41

0.43

0.44

0.44

0.48

0.48

0.49

0.48

0.51

0.53

0.55

0.54

0.51

0.46

0.45

0.45

0.47

0.52

0.54

0.56

0.61

0.60

0.63

0.71

0.85

0.86

0.80

0.89

0.93

0.96

0.98

0.99

0.95

0.99

0.96

0.99

0.96

0.90

0.93

0.89

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Se Summary Page 5 of 8

III

1IIIIIIIIIIIIItI
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.144 cfs Average ground water concentration = 900 ug/ l Average surface water concentration = 1.9 ug/ l

Max = 2.70 Min = 2.13

Month

8

8

8

8

8

8

8

8

8

8

8

8

8

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

10

10

10

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG

(cfs)

440

440

443

440

427

421

421

422

422

416

415

412

419

408

414

421

421

426

446

440

446

442

452

454

447

438

431

428

425

427

446

445

435

439

441

457

443

450

456

467

461

447

451

454

450

457

Mean Flow Rate - UG

(cfs )

185.6

185.6

187.9

185.6

175.4

170.7

170.7

171.5

171.5

166.8

166.0

163.7

169.1

160.5

165.2

170.7

170.7

174.6

190.3

185.6

190.3

187.1

195.0

196.5

191.1

184.0

178.5

176.2

173.8

175.4

190.3

189.5

181.7

184.8

186.4

198.9

187.9

193.4

198.1

206.7

202.0

191.1

194.2

196.5

193.4

198.9

Mixed Cone,

(ug/l )

2.60

2.60

2.59

2.60

2.64

2.66

2.66

2.65

2.65

2.67

2.68

2.69

2.66

2.70

2.68

2.66

2.66

2.64

2.58

2.60

2.58

2.59

2.56

2.56

2.58

2.60

2.62

2.63

2.64

2.64

2.58

2.58

2.61

2.60

2.59

2.55

2.59

2.57

2.55

2.53

2.54

2.58

2.57

2.56

2.57

2.55

Rank

61

62

80

63

39

28

29

32

33

17

10

6

22

1

9

30

31

37

88

64

89

73

122

128

95

57

44

43

36

40

90

84

52

59

68

136

81

113

135

154

143

96

118

129

114

137

Prob. of Non - Exceed.

0.83

0.83

0.78

0.83

0.89

0.92

0.92

0.91

0.91

0.95

0.97

0.98

0.94

1.00

0.98

0.92

0.92

0.90

0.76

0.83

0.76

0.80

0.67

0.65

0.74

0.84

0.88

0.88

0.90

0.89

0.75

0.77

0.86

0.84

0.81

0.63

0.78

0.69

0.63

0.58

- 0.61

0.74

0.68

0.65

0.69

0.63

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

I

File: StatSig.xl s Sheet: Se Summary Page 6 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentrations in the Jorda n River based on Mean of Daily Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.144 cfs Average ground water concentration = 900 ug/l Average surface water concentration = 1.9 ug/l

Max= 2.70 Min = 2.13

Month

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs)

457

450

448

462

461

450

454

458

463

452

464

465

455

426

419

422

420

415

419

412

• 415

409

417

431

415

416

432

438

431

443

431

416

432

432

435

446

440

439

440

442

442

444

442

441

437

441

Mean Flo w Rate - UG

(cfs )

198.9

193.4

191.8

202.8

202.0

193.4

196.5

199.7

203.6

195.0

204.4

205.1

197.3

174.6

169.1

171.5

169.9

166.0

169.1

163.7

166.0

161.3

167.6

178.5

166.0

166.8

179.3

184.0

178.5

187.9

178.5

166.8

179.3

179.3

181.7

190.3

185.6

184.8

185.6

187.1

187.1

188.7

187.1

186.4

183.2

186.4

Mixed Cone,

(ug/l)

2.55

2.57

2.57

2.54

2.54

2.57

2.56

2.55

2.53

2.56

2.53

2.53

2.55

2.64

2.66

2.65

2.66

2.68

2.66

2.69

2.68

2.70

2.67

2.62

2.68

2.67

2.62

2.60

2.62

2.59

2.62

2.67

2.62

2.62

2.61

2.58

2.60

2.60

2.60

2.59

2.59

2.58

2.59

2.59

2.61

2.59

Rank

138

115

102

145

144

116

130

140

148

123

150

152

132

38

23

34

26

11

24

7

12

3

21

45

13

18

48

58

46

82

47

19

49

50

53

91

65

60

66

74

75

83

76

69

56

70

Prob. of Non - Exceed.

0.62

0.69

0.72

0.60

0.61

0.68

0.65

0.62

0.60

0.66

0.59

0.59

0.64

0.90

0.94

0.91

0.93

0.97

0.93

0.98

0.97

0.99

0.94

0.88

0.96

0.95

0.87

0.84

0.87

0.78

0.87

0.95

0.87

0.86

0.86

0.75

0.82

0.84

0.82

0.80

0.80

0.77

0.79

0.81

0.85

0.81

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Se Summary Page 7 of 8

IIIIIIIIIIIi

i

i§

i

i

i

i
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Selenium Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.144 cfs Average ground water concentration = 900 ug/ l Average surface water concentration = 1.9 ug/ l

Max = M in =

2.70

2.13

Month

11

11

11

11

11

11

11

11

11

11

11

11

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

Day

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Mean Flow Rate - DG (cfs)

441

436

440

442

442

445

450

442

448

449

448

447

448

447

445

451

445

447

451

452

448

448

455

449

452

449

457

453

449

447

447

446

446

446

451

454

453

459

463

462

464

476

474

Mean Flow Rate - UG

(cfs)

186.4

182.5

185.6

187.1

187.1

189.5

193.4

187.1

191.8

192.6

191.8

191.1

191.8

191.1

189.5

194.2

189.5

191.1

194.2

195.0

191.8

191.8

197.3

192.6

195.0

192.6

198.9

195.8

192.6

191.1

191.1

190.3

190.3

190.3

194.2

196.5

195.8

200.4

203.6

202.8

204.4

213.8

212.2

Mixed Cone,

(ug/l )

2.59

2.61

2.60

2.59

2.59

2.58

2.57

2.59

2.57

2.57

2.57

2.58

2.57

2.58

2.58

2.57

2.58

2.58

2.57

2.56

2.57

2.57

2.55

2.57

2.56

2.57

2.55

2.56

2.57

2.58

2.58

2.58

2.58

2.58

2.57

2.56

2.56

2.54

2.53

2.54

2.53

2.50

2.51

Rank

71

55

67

77

78

85

117

79

103

109

104

97

105

98

86

119

87

99

120

124

106

107

133

110

125

1 11

139

126

112

100

101

92

93

94

121

131

127

141

149

146

151

169

165

Prob. of Non - Exceed.

0.81

0.85

0.82

0.79

0.79

0.77

0.68

0.78

0.72

0.70

0.72

0.74

0.71

0.73

0.77

0.68

0.76

0.73

0.67

0.66

0.71

0.71

0.64

0.70

0.66

0.70

0.62

0.66

0.69

0.73

0.72

0.75

0.75

0.74

0.67

0.64

0.65

0.62

0.59

0.60

0.59

0.54

0.55

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Se Summary Page 8 of 8
Estimated Mean of Mean Dail y Flow Rates and Predicted Antimon y Concentration s in the Jorda n River

with Groundwater Discharge at 380 ug/l Midvale Slag OU 2

600

550

100

0.71

- 0.70

Jorda n River Mean Flow

Sb Concentration

(D (£>

0.62

Day

File : StatSig.xl s Page: Sb Cone. & Flow

9/24/2002 Page 1 of 1
Estimated Antimon y Concentration s in the Jorda n River at Mean Daily Flow Rate Probabilit y of Non-Exceedance with Groundwater Discharge at 380 ug/l

and Upstream Concentration at 0.6 ug/l

1.00

0.90 -

0.80

0.62 0.63 0.64 0.65 0.66 0.67

Concentration (ug/l )

0.68 0.69 0.70 0.71

File : StatSig.xl s Page: Sb Prob.

9/24/2002 Page 1 of 1
COM

Midvale Slag OU2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentration s in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.043 cfs Average ground water concentration = 380 ug/ l Average surface water concentration = 0.6 ug/ l

Max = M in =

0.70

0.63

Month

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

Day

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Mean Flow Rate - DG

(cfs )

470

474

476

467

471

470

468

469

470

474

479

480

481

487

488

487

493

480

481

472

486

488

487

488

494

501

503

502

498

497

499

502

506

522

527

531

533

534

536

540

543

550

560

567

578

578

576

Mean Flo w Rate - UG

(cfs)

209.1

212.2

213.8

206.7

209.8

209.1

207.5

208.3

209.1

212.2

216.1

216.9

217.7

222.4

223.1

222.4

227.1

216.9

217.7

210.6

221.6

223.1

222.4

223.1

227.8

233.3

234.9

234.1

231.0

230.2

231.7

234.1

237.2

249.7

253.7

256.8

258.4

259.1

260.7

263.8

266.2

271.7

279.5

285.0

293.6

293.6

292.0

Mixed Cone,

(ug/l )

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.67

0.67

0.67

0.67

0.67

0.68

0.67

0.68

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.67

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.66

Rank

157

163

167

153

161

158

155

156

159

164

171

172

176

181

184

182

188

173

177

162

180

185

183

186

189

197

202

199

194

193

195

200

204

207

209

210

211

213

216

218

219

220

222

223

231

232

229

Prob. of Non - Exceed.

0.57

0.56

0.54

0.58

0.56

0.57

0.58

0.57

0.57

0.55

0.53

0.53

0.52

0.51

0.50

0.50

0.49

0.53

0.52

0.56

0.51

0.50

0.50

0.49

0.49

0.46

0.45

0.46

0.47

0.47

0.47

0.46

0.44

0.44

0.43

0.43

0.43

0.42

0.41

0.41

0.40

0.40

0.40

0.39

0.37

0.37

0.38

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 1 of 8

IIIIIIIIfIIIIIIIIII
COM

Midvale Slag OU2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.043 cfs Average ground water concentration = 380 ug/ l Average surface water concentration = 0.6 ug/ l

Max= 0.70 Min = 0.63

Month

2

2

2

2

2

2

2

2

2

2

2

2

2

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

4

4

Day

17

18

19

20

21

22

23

24

25

26

27

28

29

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

Mean Flo w Rate - DG (cfs)

578

589

587

585

588

601

596

600

600

597

600

598

599

589

582

587

581

583

587

578

580

591

586

587

584

578

583

583

579

581

578

577

574

573

574

593

604

615

614

617

624

612

610

613

622

647

Mean Flo w Rate - UG (cfs)

293.6

302.2

300.6

299.0

301.4

311.6

307.7

310.8

310.8

308.4

310.8

309.2

310.0

302.2

296.7

300.6

295.9

297.5

300.6

293.6

295.1

303.7

299.8

300.6

298.3

293.6

297.5

297.5

294.3

295.9

293.6

292.8

290.4

289.7

290.4

305.3

313.9

322.5

321.7

324.1

329.6

320.2

318.6

321.0

328.0

347.6

Mixed Cone.

(ug/l )

0.66

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.66

0.65

0.65

0.66

0.66

0.65

0.65

0.65

0.65

0.66

0.65

0.65

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

Rank

233

254

249

247

253

266

258

263

264

259

265

260

262

255

242

250

240

243

251

234

239

256

248

252

246

235

244

245

237

241

236

230

226

225

227

257

267

274

273

275

281

270

269

271

279

300

Prob. of Non - Exceed.

0.37

0.31

0.32

0.33

0.31

0.28

0.30

0.28

0.28

0.29

0.28

0.29

0.29

0.31

0.34

0.32

0.35

0.34

0.32

0.36

0.35

0.30

0.32

0.31

0.33

0.36

0.34

0.33

0.35

0.34

0.36

0.37

0.38

0.39

0.38

0.30

0.27

0.25

0.26

0.25

0.23

0.26

0.27

0.26

0.24

0.18

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 2 of 3
COM

Midvale Sla g OU 2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = Average ground water concentration = Average surface water concentration =

0.043 cfs

380 ug/l

0.6 ug/l

Max= 0.70 Min = 0.63

Month

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

Day

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flo w Rate - DG

(cfs)

631

619

I 613

620

622

627

632

631

629

635

629

624

624

624

617

643

650

654

648

645

639

650

647

654

663

650

653

632

633

634

655

.657

647

647

658

672

674

684

 683

673

685

683

718

736

735

720

Mean Flow Rate - UG

(cfs )

335.0

325.6

321.0

326.4

328.0

331.9

335.8

335.0

333.5

338.2

333.5

329.6

329.6

329.6

324.1

344.4

349.9

353.0

348.3

346.0

341.3

349.9

347.6

353.0

360.1

349.9

352.3

335.8

336.6

337.4

353.8

355.4

347.6

347.6

356.2

367.1

368.7

376.5

375.7

367.9

377.3

375.7

403.1

417.2

416.4

404.7

Mixed Cone,

(ug/l )

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.65

0.64

0.64

0.64

0.64

 0.64

0.64

0.64

0.64

0.64

0.64

0.64

Rank

289

277

272

278

280

286

291

290

287

295

288

282

283

284

276

298

305

309

304

299

296

306

301

310

314

307

308

292

293

294

311

312

302

303

313

316

318

322

320

317

323

321

327

332

331

329

Prob. of Non - Exceed.

0.21

0.25

0.26

0.24

0.24

0.22

0.21

0.21

0.22

0.20

0.22

0.23

0.23

0.23

0.25

0.19

0.17

0.16

0.17

0.19

0.19

0.17

0.18

0.16

0.14

0.16

0.16

0.20

0.20

0.20

0.15

0.15

0.18

0.17

0.15

0.14

0.13

0.12

0.13

0.14

0.12

0.13

0.11

0.10

0.10

0.10

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 3 of 8

IIIIIIIIIIIIII1

i

i

i

i
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentration s in the Jorda n River based on Mean of Daily Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.043 cfs Average ground water concentration = 380 ug/l Average surface water concentration = 0.6 ug/l

Max= 0.70 Min = 0.63

Month

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

7

7

7

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG

(cfs )

720

736

784

829

807

814

820

839

843

851

863

880

888

899

898

903

902

916

906

910

909

889

890

876

857

865

864

842

826

819

788

771

750

745

745

719

705

716

691

676

663

642

625

604

598

579

Mean Flow Rate - UG

(cfs )

404.7

417.2

454.8

490.0

472.8

478.2

482.9

497.8

500.9

507.2

516.6

529.9

536.1

544.7

544.0

547.9

547.1

558.1

550.2

553.4

552.6

536.9

537.7

526.8

511.9

518.1

517.4

'500. 1

487.6

482.1

457.9

444.6

428.2

424.2

424.2

403.9

392.9

401.6

382.0

370.3

360.1

343.6

330.3

313.9

309.2

294.3

Mixed Cone,

(ug/l )

0.64

0.64

0.64

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.63

0.64

0.64

0.64

0.64

0.64

0.64

0.64

0.64

0.64

0.64

0.65

0.65

0.65

0.65

0.65

0.66

Rank

330

333

338

345

340

341

343

 346

348

349

351

355

356

360

359

362

361

366

363

365

364

357

358

354

350

353

352

347

344

342

339

337

336

334

335

328

325

326

324

319

315

297

285

268

261

238

Prob. of Non- Exceed.

0.10

0.09

0.08

0.06

0.07

0.07

0.07

0.06

0.05

0.05

0.04

0.03

0.03

0.02

0.02

0.01

0.02

0.00

0.01

0.01

0.01

0.03

0.02

0.04

0.05

0.04

0.04

0.05

0.06

0.07

0.08

0.08

0.08

0.09

0.09

0.11

0.11

0.11

0.12

0.13

0.14

0.19

0.22

0.27

0.29

0.35

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 4 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentrations in the Jorda n River based on Mean of Daily Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = 0.043 cfs Average ground water concentration = 380 ug/l Average surface water concentration = 0.6 ug/l

Max = 0.70 M in = 0.63

Month

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

Day

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs)

567

575

551

535

533

538

535

523

519

512

494

494

490

494

485

480

475

476

485

501

503

502

499

480

477

470

461

463

456

449

436

434

442

. 428

420

416

414

409

417

410

416

411

416

423

421

428

Mean Flow Rate - UG

(cfs)

285.0

291.2

272.4

259.9

258.4

262.3

259.9

250.5

247.4

241.9

227.8

227.8

224.7

227.8

220.8

216.9

213.0

213.8

220.8

233.3

234.9

234.1

231.7

216.9

214.5

209.1

202.0

203.6

198.1

192.6

182.5

180.9

187.1

176.2

169.9

166.8

165.2

161.3

167.6

162.1

166.8

162.9

166.8

172.3

170.7

176.2

Mixed Cone,

(ug/l )

0.66

0.66

0.66

0.66

0.66

0.66

0.66

0.67

0.67

0.67

0.67

0.67

0.67

_ 0.67

0.67

0.68

0.68

0.68

0.67

0.67

0.67

0.67

0.67

0.68

0.68

_ 0.68

0.68

0.68

0.68

0.68

0.69

0.69

0.69

0.69

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.69

0.70

0.69

Rank

224

228

221

214

212

217

215

208

206

205

190

191

187

192

178

174

166

168

179

198

203

201

196

175

170

160

142

147

134

108

54

51

72

41

25

14

8

2

20

4

15

5

16

35

27

42

Prob. of Non- Exceed.

0.39

0.38

0.40

0.42

0.42

0.41

0.41

0.43

0.44

0.44

0.48

0.48

0.49

0.48

0.51

0.53

0.55

0.54

0.51

0.46

0.45

0.45

0.47

0.52

0.54

0.56

0.61

0.60

0.63

0.71

0.85

0.86

0.80

0.89

0.93

0.96

0.98

0.99

0.95

0.99

0.96

0.99

0.96

0.90

0.93

0.89

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 5 of 8

IIIIIIIII1IIIIItI1I
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentrations in the Jorda n River based on Mean of Dail y Mean Flo w

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.043 cfs Average ground water concentration = 380 ug/l Average surface water concentration = 0.6 ug/l

Max = M in =

0.70

0.63

Month

8

8

8

8

8

8

8

8

8

8

8

8

8

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

10

10

10

Day

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

Mean Flow Rate - DG

(cfs )

440

440

443

440

427

421

421

422

422

416

415

412

419

408

414

421

421

426

446

440

446

442

452

454

447

438

431

428

425

427

446

445

435

439

441

457

443

450

456

467

461

447

451

454

450

457

Mean Flow Rate - UG

(Cfs)

185.6

185.6

187.9

185.6

175.4

170.7

170.7

171.5

171.5

166.8

166.0

163.7

169.1

160.5

165.2

170.7

170.7

174.6

190.3

185.6

190.3

187.1

195.0

196.5

191.1

184.0

178.5

176.2

173.8

175.4

190.3

189.5

181.7

184.8

186.4

198.9

187.9

193.4

198.1

206.7

202.0

191.1

194.2

196.5

193.4

198.9

Mixed Cone,

(ug/l )

0.69

0.69

0.69

0.69

0.69

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.69

0.69

0.69

0.69

0.69

0.68

0.68

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.68

0.69

0.68

0.68

0.68

0.68

0.69

0.68

0.68

0.68

0.68

Rank

61

62

80

63

39

28

29

32

33

17

10

6

22

1

9

30

31

37

88

' 6 4

89

73

122

128

95

57

44

43

36

40

90

84

52

59

68

136

81

113

135

154

143

96

118

129

114

137

Prob. of Non- Exceed.

0.83

0.83

0.78

0.83

0.89

0.92

0.92

0.91

0.91

0.95

0.97

0.98

0.94

1.00

0.98

0.92

0.92

0.90

0.76

0.83

0.76

0.80

0.67

0.65

0.74

0.84

0.88

0.88

0.90

0.89

0.75

0.77

0.86

0.84

0.81

0.63

0.78

0.69

0.63

0.58

0.61

0.74

0.68

0.65

0.69

0.63

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 6 of 8
COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentrations in the Jorda n River based on Mean of Dail y Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flo w rate = 0.043 cfs Average ground water concentration = 380 ug/l Average surface water concentration = 0.6 ug/l

Max= 0.70 M in = 0.63

Month

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

Day -

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Mean Flow Rate - DG

(cfs )

457

450

448

462

461

450

454

458

463

452

464

465

455

426

419

422

420

415

419

412

415

409

417

431

415

416

432

438

431

443

431

416

432

432

435

446

440

439

440

442

442

444

442

441

437

441

Mean Flow Rate - UG

(cfs)

198.9

193.4

191.8

202.8

202.0

193.4

196.5

199.7

203.6

195.0

204.4

205.1

197.3

174.6

169.1

171.5

169.9

166.0

169.1

163.7

166.0

161.3

167.6

178.5

166.0

166.8

179.3

184.0

178.5

187.9

178.5

166.8

179.3

179.3

181.7

190.3

185.6

184.8

'185. 6

187.1

187.1

188.7

187.1

186.4

183.2

186.4

Mixed Cone,

(ug/l )

0.68

0.68

0.69

0.68

0.63

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.69

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.70

0.69

0.70

0.70

0.69

0.69

0.69

0.69

0.69

0.70

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

0.69

Rank

138

115

102

145

144

116

130

140

148

123

150

152

132

38

23

34

26

11

24

7

12

3

21

45

13

18

48

58

46

82

47

19

49

50

53

91

65

60

66

74

75

83

76

69

56

70

Prob. of Non - Exceed.

0.62

0.69

0.72

0.60

0.61

0.68

0.65

0.62

0.60

0.66

0.59

0.59

0.64

0.90

0.94

0.91

0.93

0.97

0.93

0.98

0.97

0.99

0.94

0.88

0.96

0.95

0.87

0.84

0.87

0.78

0.87

0.95

0.87

0.86

0.86

0.75

0.82

0.84

0.82

0.80

0.80

0.77

0.79

0.81

0.85

0.81

Probabilit y of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 7 of 8

I1IIIIIIII

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COM

Midvale Slag OU 2

3282-986-FSZ-DGRCZ

Estimated Antimon y Concentration s in the Jorda n River based on Mean of Dail y Mean Flow

Ground Water/Surfac e Water Mixin g Parameters Ground water flow rate = Average ground water concentration = Average surface water concentration =

0.043 cfs

380 ug/l

0.6 ug/l

Max= 0.70 Min = 0.63

Month

11

11

11

11

11

11

11

11

11

11

11

11

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

Day

19

20

21

22

23

24

25

26

27

28

29

30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Mean Flow Rate - DG (cfs)

441

436

440

442

442

445

450

442

448

449

448

447

448

. 447

445

451

445

447

451

452

448

448

455

449

452

449

457

453

449

447

447

446

446

446

451

. 454

453

459

463

462

464

476

474

Mean Flo w Rate - UG (cfs)

186.4

182.5

185.6

187.1

187.1

189.5

193.4

187.1

191.8

192.6

191.8

191.1

191.8

191.1

189.5

194.2

189.5

191.1

194.2

195.0

191.8

191.8

197.3

192.6

195.0

192.6

198.9

195.8

192.6

191.1

191.1

190.3

190.3

190.3

194.2

196.5

195.8

200.4

203.6

202.8

204.4

213.8

212.2

Mixed Cone,

(ug/i)

0.69

0.69

0.69

0.69

0.69

0.69

0.68

0.69

0.69

0.68

0.69

0.69

0.69

0.69

0.69

0.68

0.69

0.69

0.68

0.68

0.69

0.69

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.69

0.69

0.69

0.69

0.69

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

0.68

Rank

71

55

67

77

78

85

117

79

103

109

104

97

105

98

86

1 19

87

99

120

124

106

107

133

110

125

1 11

139

126

112

100

101

92

93

94

121

131

127

141

149

146

151

169

165

Prob. of Non- Exceed.

0.81

0.85

0.82

0.79

0.79

0.77

0.68

0.78

0.72

0.70

0.72

0.74

0.71

0.73

0.77

0.68

0.76

0.73

0.67

0.66

0.71

0.71

0.64

0.70

0.66

0.70

0.62

0.66

0.69

0.73

0.72

0.75

0.75

0.74

0.67

0.64

0.65

0.62

0.59

0.60

0.59

0.54

0.55

Probability of Occurrence

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

0.0027

File: StatSig.xl s Sheet: Sb Summary Page 8 of 8
I

I Attachment C Calculation of Arsenic Concentrations at I Discrete Locations

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COM

Midvale Slag OU2 By: B. Cotton 8/26/2002

3282-986-FSZ-FGRCZ Ck: MJ S 8/30/2002 Maximum Allowable Concentrations Withi n Arsenic Plume Segment s i n the US&G Aquifer

III

I

Objective -Estimate allowable concentrations within discrete segments of the arsenic plum e in the US&G Aquifer that will not result in exceedance of the average allowable discharge limit. _ Method- " T he arsenic contaminant plume observed within the US&G Aquifer generall y has higher

concentrations in the center of the plume than on the edges of the plum e due to dispersio n of the m

contaminant durin g transport from the source area. The maximum allowable average groundwater B

to surface water discharge concentration has been calculated for the entire plum e (see references). Calculatio n of the maximum allowable discharge concentration at various discrete location s withi n

t he plumes for plume provides specific informatio n that can be used for monitorin g and assessment

purposes. This calculatio n is performed as follows:

1 Existing data was examined and the aerial distributio n of the arsenic plume was segmented It

into a series of "flow tubes". Each flo w tube represents a discrete width of a constituen t Q

plume that is (or may) discharge to the Jorda n River. The plume is segmented based on

flo w net principle s using existing concentrations as a guide. m

2 The maximum allowable discharge concentration in a flo w tube is calculated as follows: • C -Cobs * Pe

where: M C = Maximum allowable average groundwater discharge concentration in

t he downgradien t portion of the flo w tube Cobs = Observed average groundwater discharge concentration in the

downgradien t portion of the flo w section Pe = Plume expansion factor T he plume expansion factor represents the amount that the entire plum e can

increase in concentration without exceeding the total allowabl e loadin g to the

river. This is calculated as follows: Pe = Cgw/Cpre s

where: C gw = Calculated maximum allowabl e average groundwater

discharge for entire plum e based on standard Cpres = Calculated present plum e average groundwater discharge T he present average groundwater discharge concentration is the sum of the the

incremental loadin g for each flo w section. The incremental loadin g from each ^ flo w tube is calculated as follows: •

I = Cobs * Pf *

where: I = Incremental load from the correspondin g flo w section. •> Pf = Plume flo w weightin g factor TM T he plume flo w weightin g factor represents the amount that the plum e segment

contributes due to flow relative to the entire plume contribution . This is foun d by ft

dividin g the width of the plume segment by the width of the entire plume . P

IIII

File: POA-Conc-As.xls Page 1 of 3

III
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COM

Midvale Slag OU2 By: B. Cotton

3282-986-FSZ-FGRCZ Ck: MJ S Maximum Allowable Concentrations Within Arsenic Plume Segment s in the US&G Aquifer

8/26/2002

8/30/2002

Assumption s - T he followin g assumptions are made in order to make these calculations:

1 The relative concentrations within plume segments is constant overtime, i.e. increases in

plume concentration in the various flo w segments wil l always be proportional .

2 The plume concentration is assumed to increase linearl y over time.

3 Plume width and thickness are assumed to be constant.

Calculation s - Maximum concentrations of As observed in monitoring well s over the period from 1997 to 2001 are

plotted on the attached drawing. Groundwater altitude contours for 2001 are also plotted on this

drawing. The constituent plume has been segmented so that each extends from the source areas

upgradien t to the discharge point at the Jorda n River. Plume segment data plume is summarized in

t he followin g tables. The incremental concentration, I, an d the total flow weighted average

concentration, Cpres , can be calculated from thi s information .

Plume Segmen t

1

2

3

4

5 Total

Width ( m)

185

90

90

100

185

650

Pf (fraction)

0.28

0.14

0.14

0.15

0.28

1.00

Observed Cone. (ug/L)

160

1300

1900

1000

450

I

(ug/L-ft )

46

180

263

154

128

771 Cpres = 7 71 ug/L-ft

Pe= 8.223

Cgw = 6336 ug/L-ft based on the Clas s 4 classificatio n in UAC 317-2

Plume Segmen t

1

2

3

4

5 Total

Cobs

(ug/L )

160

1300

1900

1000

450

C

(ug/L )

1,316

10,690

15,623

8,223

3,700

Incremental Load (ug/L-ft)

374

1,480

2,163

1,265

1,053

6,336

File: POA-Conc-As.xls Page 2 of 3
COM

Midvale Sla g OU2 By: B. Cotton

3282-986-FSZ-FGRCZ Ck: MJ S Maximum Allowable Concentration s Withi n Arsenic Plume Segment s i n the US&G Aquifer

8/26/2002

8/30/2002

Pe= 3.725

Cgw = 2870 ug/L-ft based on statistical sig. relative to surface water qualit y

Plume Segmen t

1

2

3

4

5 Total

;

Cobs

(ug/L )

160

1300

1900

1000

450

C (ug/L )

596

4,842

7,077

3,725

1,676

Incremental Load (ug/L-ft)

170

670

980

573

477

2,870

References - C OM 2002. Maximum allowable average discharge concentration for the US&G Aquifer based on

surface water qualit y criteria. Calculatio n brief Augus t 2002.

C OM 2002. Maximum allowable average discharge concentrations in US& G Aquifer based on

statisticall y significan t increase. Calculatio n brief Augus t 2002.

C OM 2002. Estimated groundwater infow rates; arsenic, cadmium, selenium, and antimon y plumes . Calculatio n brief s presented in Appendix C of the Groundwater FFS.

"COM 2001. Jorda n River low flo w evaluation . Calculatio n brief presented in Appendi x C of the Groundwater FFS .

File: POA-Conc-As.xls Page 3 of 3

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2254400

2254200-

2254000-

2253800-

2253600-

2253400-

2253200-

2253000-

2252800

464300 464500

i r 464900I T 465100 465300

4290 Maximum Arsenic Concentration (ug/L)

US&G Groundwater Elevation (2001) Contour interval = 0.5 ft

Plume Segment Boundary

AN

meters

Figure 1

Maximum Dissolved Arsenic US&G Aquifer, 1997-2001 Midvale Slag Superfun d Site Midvale, Utah