Wasa

tch B

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ard

La CailleRestaurant

Little Cottonwood Lane

Quail

Ridg

e Roa

d

Little Cottonwood Canyon Rd

Undeveloped Land

NorthernResidential

SouthernResidential

EasternResidential

Undeveloped

Little Cot ton wo od Creek

?Ï

Davenport Smelter

Flagstaff Smelter

_̂

_̂

U4

U2U3

C24

U34

C4

C5

µProjection: UTM NAD83 Zone 12N

100 0 100 200Feet

Commercial

OU2 Boundary

Undeveloped

Remediated ResidentialProperties

Aerial Reference: AGRC 2009 High ResolutionOrtho-Imagery 1 Foot Color

Note: Commercial Clean-Up Level > = 1,000 mg/kg; Undeveloped Clean-Up Level > = 3,000 mg/kg

Grids Exceeding Lead Clean-UpLevel & Requiring Remediation

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Figure 3: Extent of Clean-upDescribed in ROD

Salt Lake County, UtahOU2 Explanation of Significant Differences

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!C!C!C!C!C

!C!C!C!C!C!C!C

!C!C!C!C!C!C!C

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U4-PT129Depth PB (MG/KG)Surf - 3,550 00-06 - 1,53006-12 - 4412-18 - 5418-24 - 36

U2-PT67Depth PB (MG/KG)Surf - 210 00-06 - 17406-12 - 5712-18 - 2,17018-24 - 13,28824-30 - 45630-36 - 5136-37 - 52

U3-PT53Depth PB (MG/KG)Surf - 45,259 00-06 - 9,77706-12 - 15612-18 - 4318-24 - 3624-30 - 2830-36 - 2036-37 - 31

U4-PT15Depth PB (MG/KG)Surf - 10,847 00-06 - 18,23606-12 - 21,96212-18 - 19,08518-24 - 21,26424-30 - 11,34930-36 - 13,34136-37 - 94

U4-PT12Depth PB (MG/KG)Surf - 18,967 00-06 - 25,01506-12 - 13,21612-18 - 42518-24 - 38824-30 - 4230-36 - 37

U4-PT30Depth PB (MG/KG)Surf - 24,953 00-06 - 23,28706-12 - 1,48012-18 - 25118-24 - 2524-30 - 5030-36 - 34

U4-PT67Depth PB (MG/KG)Surf - 38,733 00-06 - 3,71406-12 - 23612-18 - 3818-24 - 6724-30 - 6630-36 - 31

U4-PT85Depth PB (MG/KG)Surf - 880 00-06 - 1,74406-12 - 1,86412-18 - 8,28118-24 - 1,78524-30 - 27930-36 - 38

U4-PT90Depth PB (MG/KG)Surf - 20,977 00-06 - 18,00606-12 - 10212-18 - 3218-24 - 2924-30 - 4130-36 - 39

U4-PT56Depth PB (MG/KG)Surf - 3,587 00-06 - 4,37406-12 - 17412-18 - 6418-24 - 6124-30 - 2830-36 - 25

U4-PT38Depth PB (MG/KG)Surf - 36,372 00-06 - 4,53006-12 - 5512-18 - 3218-24 - 26

U4-PT02Depth PB (MG/KG)Surf - 11,419 00-06 - 13,19406-12 - 16,99112-18 - 13,11118-24 - 6,07524-30 - 10930-36 - 12436-37 - 80

70

58

16

76

8652

73

4833

64

215

459

604

677

137231

484

269

964

708

237

196

526

910910

928

831715

597

319

301110882

946

644

869631

154

237

394

765

193

319

679

361

143

210

788

461

122

306

445

600

201

300145

685

244

331

752

880

867

8234458

6150

3348

55591262

5690

9875

4133 55025209

4614

6094

3093

2956

1965

1573

1301

1569

1050

7684

2473

4191

5004

13623880

5117

6541

44052979

1513

2953

4817

1088

29373169

1071

2470

1159

1614

25764082

6153

2996

5505

6595

4103 1877

2903

7835

1929

2834

4584

11252349

4764

4255

7098

5939

1533

5914

60631558

2753

3078

1663

2876

1100

2776

3834

4610

2906

2020

3578

1429

1375

3023

2829

73713143

1919

4635

6443

3587

5207

6925

1066

22911585

6240

2229

9156

5403

4869

2686

33384357

1880

5518

2343

8307

6924

1606

4873 6885

6885

2256

3115

9303

4891

2758

4230

1097

1790

2579

1926

2601

3194

1976

3476

52859928

4014

1156

6285

3697

3171

4360

4095

2536

4515

1496

1146

2152

5784

7169 4866

4559

8791

7724

1527

7257

3280

1041

2388

2015

45259

19495

25205

15759

15115

17596

12079

10970

20977

36372

11419 15282

12117

24913

10847

20543

38733

16844

24953

18967

74

58

97

89 96

68

19

86

30

249

259283

118

107

439284 239

588

531

158

887464

322

731

310

969

242 157

699

140

6161

2434

19691861

2514

4107

5467

1803

5874

86658962

3550

1918

8960

16272200

1764

1121

3435

67158153

27027827

1213

1417

4906

7924

2988

4223

3123

79465552

6648

2140

2164

21808434

910117451364

6204

3249

25346049

42214163

8738

2272

1865

1480

4731

7606

2644

43971660

4143

2208

3385

4189

4803

1334

1123

1351

1778

38811

29255

19761

11723

13977

18617

11639

15313

13367

1360134357

42466

12748

12386 11329

22369

14542

14029

37119

µProjection: UTM NAD83 Zone 12N

30 0 30 60Feet

Lead Results Contours

OU2 Boundary

Aerial Reference: AGRC 2009 High ResolutionOrtho-Imagery 1 Foot Color

Note: Undeveloped Clean-Up Level > = 3,000 mg/kg

Grids With RI Sample ResultsExceeding Lead Clean-Up Level& Requiring Pre-Design Sampling

2,000 ppm Pb2,500 ppm Pb3,000 ppm Pb

Remediation Areas and Depth (inches)6" (0.99 acres)12" (0.30 acres)18" (0.02 acres)24" (0.27 acres)36" (0.04 acres)

Sample Location and Result (mg/kg)!(

Depth Sample Location!CPa

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Salt Lake County, UtahOU2 Explanation of Significant Differences

Figure 4:Area 1 Pre-Design Sample Resultsand Remedial Areas

6" Roadbase6" Underlying Soil

6"

6"

Wasa

tch B

lvd

Contamination Remains at Depth,to an Unknown Extent BeneathApprox. 3-4 Feet of Clean Material

12"

24"

12"

6"

6"

3'

2.5'

3'

6.5'

24"

18"

6"

µMap Scale = 1:600 1 inch = 50 feet

Projection: UTM NAD83 Zone 12N

25 0 25 50Feet

OU2 Boundary

Aerial Reference: AGRC 2009 High ResolutionOrtho-Imagery 1 Foot Color

Path:

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Salt Lake County, UtahOU2 Explanation of Significant Differences

Figure 7:Area 1 Completed ExcavationLimits and Depths

Davenport and Flagstaff SmeltersSuperfund Site

Salt Lake County, UtahOU2 Explanation of Significant Differences

Figure 6: Area 1 Limits of Excavation

Wasa

tch Bl

vd

µProjection: UTM NAD83 Zone 12N

30 0 30 60Feet

OU2 Boundary

Aerial Reference: AGRC 2009 High ResolutionOrtho-Imagery 1 Foot Color

Note: Undeveloped Clean-Up Level > = 3,000 mg/kg

Grids With RI Sample ResultsExceeding Lead Clean-Up Level& Requiring Pre-Design Sampling

Remediation Areas and Depth (inches)6" (0.99 acres)12" (0.30 acres)18" (0.02 acres)24" (0.27 acres)36" (0.04 acres)

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Areas of Gambel Oak Retained

Salt Lake County, UtahOU2 Explanation of Significant Differences

Figure 5:Area 1Areas of Gambel Oak Retained

PHOTOGRAPHIC LOG

UDEQ Davenport and Flagstaff

Remedial Action Area 1

Photo No.

1 Oct. 10,

2011 Direction Photo Taken: Looking southeast.

Description: Eastern Boundary View across the eastern excavation boundary showing trench location.

Photo No.

2 Oct. 25,

2011

Direction Photo Taken: Looking south.

Description: Vegetation East excavation face showing vegetation and large boulder. Excavation face contains some whole and crushed slag.

Trench 1

Trench 3

Trench 4

Trench 2

Storm Sewer

Slag Layer

PHOTOGRAPHIC LOG

UDEQ Davenport and Flagstaff

Remedial Action Area 1

Photo No.

3 Oct. 25,

2011 Direction Photo Taken: Looking south.

Description: South Excavation Slag Layer South excavation between Area 1 Subparts P and O. Material contains crushed slag and charcoal.

Photo No.

4 Oct. 19,

2011 Direction Photo Taken: Looking west.

Description: Area Requiring Additional Excavation View across the southern excavation showing trench location and areas where additional excavation depth is needed to remove slag. Areas approximately shown.

XRF Pb Result ~ 30,000 ppm

Charcoal

Crushed slag

Trench 1

Trench 3

Trench 4

Trench 2

Trench 5

Storm Sewer Additional

Area 3 Additional

Area 1

Additional Area 2

Additional Area 4

(Unknown)