00_31_32.13_Appendix_A-Subsurface_Drilling_and_Sampling_Info.pdf

Appendix A

McCook Reservoir Groundwater Monitoring Wells

00 31 32.13_Appendix A-Subsurface Drilling and Sampling Info

M c C o o k G r o u n d w a t e r M o n i t o r i n g W e l l s - B o r i n g F o l i o L o c a t i o n s

Location Map

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MW-8

MW-7

MW-6

MW-5 MW-4 MW-3

MW-1

SSI-B-41

SSI-B-40

DH-74-45

DH-74-44

SSI-SB-44

SSI-SB-43

LB-121-08

LB-111-98

LB-110-98

LB-109-98 LB-107-98LB-105-98

LB-104-98

LB-103-98

LB-102-98

LB-101-98

LB-105A-98

LB-104B-99

LB-104A-98

LB-103A-98

LB-101A-98

Golder-23PGolder-22P

G-07

G-06 G-04

G-03

G-02G-01

G-05 DISCLAIMER - While the United States Army Corps of Engineers, (hereinafter referred to USACE) has made a reasonable effort to insure the accuracy of the maps and associated data, its should be explicit ly noted that USACE makes no warranty, representation or guaranty, either express or implied, as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein. The USACE, its officers, agents, employees, or servants shall assume no liability of any nature for any errors, omissions, or inaccuracies in the information provided regardless of how caused.

The USACE, its officers, agents, employees or servants shall assume no liability for any decisions made or actions taken or not taken by the user of the maps and associated data in reliance upon any information or data furnished here. By using these maps and associated data the user does so entirely at their own risk and explicitly acknowledges that he/she is aware of and agrees to be bound by this disclaimer and agrees not to present any claim or demand of any nature against the USACE, its officers, agents, employees or servants in any forum whatsoever for any damages of any nature whatsoever that may result from or may be caused in any way by the use of the maps and associated data.

0 330 660165

Feet µ U.S. Army Corps of Engineers Chicago District

Tuesday, July 7, 2009 J:\MXD\ICW\NLibertyville.mxd

Service Layer Credits: Sources: Esri, DeLorme, NAVTEQ, TomTom, Intermap, increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), swisstopo, and the GIS User Community Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

@A Proposed Wells

@A Boring Locations

McCook Reservoir Groundwater Monitoring Wells

DESCRIPTION

Uncansdldated Clacld Deposits

Ddomltlc reef rock. largely vesicular to coarsely wggy.

Roc& Deaaiptlans Based on Reglonal References and Geoph~lcal Logs.

McCook Reservoir Groundwater Monitoring Wells

I LITHOLOGICAL LOG 1

UnconsdMated Glacial Deposlts

Dolomitic reef rack, largely vsskular to c o a m d ~ ~ W Y .

Rack Dascdptlons B a d on Regional References ond haphysical Logs.

PROJECT: CUP-McCOOK RESERVOIR

HIELLNO. MW-8-99 LOCATION: E 633,401 N 1,860,708

ANCLE: VERTICAL CASING ELEVATION: 20.35' CCD

DRILLER. BOART LONCYEAR

SIZE k TYPE OF BIT: 5 7/8' DOWNHOLE HAMMER

GROUND ELEVATION: 20.63 FT CCD

McCook Reservoir Groundwater Monitoring Wells

DESCRIPION

Uncansdldated Uaclal Deposlts

Ddomltlc reef rock, largely vwlcular to Coamely wggy.

could not udah

Rock Dascriptlans Based an Regional R e f m c e s and Geophyalcal Logs.

Kosr = Geometric Mean of Hydraulic Conductlvlty

Results Calculated from S e w d Slug Test Analyses

McCook Reservoir Groundwater Monitoring Wells

UnconsalMoted aacloi Depoatts

Odomltlc reef rock, lwgdy mIculor to -'Y wggy.

~wNErf GMB J/bl

NOTES: CMaQD %r CSR s/ol Rock Deadptlana Baaed on Rqlonal Refumcea CSR 3/01 and Geophplcal Logs. W L E SCuE Km = Geometric Mean of Hydraulic Conductivity UMLOC.OW

Results Calculated from Sevwol Slug Test

N TS

SIS Consultants Ltd. m ~ C I NO. FIGURE NO.

Analyses 27354-XH MW-5

McCook Reservoir Groundwater Monitoring Wells

Unconwlldated Claclal Deposits

McCook Reservoir Groundwater Monitoring Wells

Uncansdldated Glaclal Dopodta

Hydraulk Conductivity graphic r e p r m b the geometric mean

Ddomltlc reef rock. largdy vesicular to m n e l y WWY.

F3 DRAW BY GMB S/m

NOTES: ORaQD BY CSR 3/01

Rock baalptlona B a d on Regional Refarencm W?fiCWD BY CSR .S/01

A and Geophyelcal Logt. W E SCKE - KSc= Hydraulic ConductMty Estimated +om UTHLOG.DWG Speclflc Capacity Test

N TS

STS Consultante Ltd. m ~ ~ a r c r NO. FIGURE NO.

Consulting Engineers 27354-XH MW-3

McCook Reservoir Groundwater Monitoring Wells

BOX OR

SAMPLE

NO.

Spoon 1 13, 8, 6 N = 14

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

Asphalt Used auger to advance through asphalt and gravel base

Spoon 8 N = 50/6" No Recovery. Switch to rock bit at 17.5' and advance to 20'.

~1/4" sand and bone shells

Qp = 2.0 tsf

Spoon 7 2, 2, 2 N = 4 Qp = 0.25 tsf

Spoon 6 8, 8, 7 N = 15 Qp = 3.5 tsf

Spoon 5 3, 3, 5, 7 N = 8 Qp = 1.5 tsf

Spoon 4 4, 4, 5 N = 9 Qp = 2.75 tsf

Spoon 3 5, 7, 8, 7 N = 15 Qp > 4.5 tsf

Spoon 2 6, 6, 10 N = 16 Qp = 2.75 tsf

Qp > 4.5 tsf

+2.0

17.5 17.8

15.0 16.5

12.5 14.0

10.0 12.0

7.5 9.5

5.0 7.0

2.5 4.0

1.0 2.5

Coarse sand and fine to coarse gravel (dolomite chips), trace clay - gray - very dense to extremely dense - wet (GP)

Silty clay, some fine to medium sand, trace shells - gray - soft (CL)

Silty clay, some fine to coarse sand -brown/gray, mottled - very stiff (CL)

Silty clay, with organics - black - soft (CL-PT)

Silty clay, little fine to coarse sand, trace fine gravel - gray and brown - stiff to very stiff (CL)

FILL: Silty clay, some fine to coarse sand, trace fine gravel - gray with brown mottling -very stiff to hard (CL)

Crushed limestone base course

+4.8

+5.5

+6.0

+11.5

+20.0

+20.6

6. DIRECTION OF HOLE

5. NAME OF DRILLER

3. DRILLING AGENCY

17DRILLING LOG SHEETS

4. HOLE NO. (As shown on drawing title and file number) LB-121-08

OF

12. MANUFACTURER'S DESIGNATION OF DRILL

--- 11/18/2008

Chicago District

Hole No. LB-121-08

STARTED

LEGEND

ENG FORM

MAR 71 1836 PREVIOUS EDITIONS ARE OBSOLETE. LB-121-08McCook Reservoir Main Tunnel

HOLE NO.PROJECT

DEG. FROM VERT.

DISTURBED

11. DATUM FOR ELEVATION SHOWN (TBM or MSL)

Chicago IL N 1,864,689.6 E 1,122,363.7

19. SIGNATURE OF INSPECTOR

COMPLETED

Mark Baker

10. SIZE AND TYPE OF BIT

INSTALLATION

16. DATE HOLE

Great Lakes and Ohio River Div.

DIVISION

14. TOTAL NUMBER CORE BOXES

e

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH a

SHEET

cb gd

PA / 2 7/8" RB

f

18. TOTAL CORE RECOVERY FOR BORING

11/26/2008

McCook Reservoir Main Tunnel

0.0

INCLINED

2. LOCATION (Coordinates or Station)

15. ELEVATION GROUND WATER

VERTICAL

13. TOTAL NO. OF

OVERBURDEN SAMPLES

TAKEN

UNDISTURBEDSubsurface Exploration, Inc.

+21.0

Chicago City Datum (vertical) NAD 83 (horizontal)

1. PROJECT

17. ELEVATION TOP OF HOLE

7. THICKNESS OF OVERBURDEN

8. DEPTH DRILLED INTO ROCK

9. TOTAL DEPTH OF HOLE

35.0 350.2 385.2

B-61

McCook Reservoir Groundwater Monitoring Wells

-21.0

-14.0

-11.0

-9.0

-3.5

Spoon 13 37, 70 N = 70+ Water in gravel thinned out drilling mud considerably.

Spoon 11 40, 47, 51 N = 98

Silt - gray - extremely dense to very dense -wet (ML)

Spoon 9 N = 70/3" Difficult drilling in occasional layer of gravel/cobbles.

30.0 31.0

27.5 29.0

25.0 26.5

22.5 23.0

20.0 20.3

RUN 1

BOX 1

35.0 44.5 high angle fracture

Dolomite (Racine Formation)

Moderately hard to hard, slightly weathered, fine-grained, light gray to gray, Dolomite;

occasional blue mottling, vuggy/porous, scattered styolites, clay partings and chert nodules.

Sandy clay and thinly bedded dolomite chips -gray - wet (SC)

Sandy gravel, little clay - very dense - wet

(GP)

32.5 34.0

34.0 70.0

Spoon 12 30, 30, 47 N = 77

PROJECT

21.0

ELEVATION TOP OF HOLEDRILLING LOG (Cont Sheet)

Chicago District

Gravel with abundant water: thinned out drilling mud considerably.

Hole No. LB-121-08

SHEETS17

Spoon 10 N = 100/6" Difficult drilling in occasional layer of gravel/cobbles.

INSTALLATION

44ENG FORM

JUN 67 1836-A LB-121-08McCook Reservoir Main Tunnel

HOLE NO.

OF

SHEET

McCook Reservoir Main Tunnel

PROJECT

BOX OR

SAMPLE

NO.

LEGEND

RQD=92%

RQD = 8.73/9.5 = 92%

Casing deflected around hard zone at approximately 17' deep. Corebarrel became stuck during extraction. A new hole was drilled 5' away from original boring due to casing deflection. Offset hole was blind drilled to bedrock, casing was set and coring began at 35 ft. Large boulders encountered from 20.5'-22.5' and 25'-26.25'.

Drilling rate: 1.75 min/ft

Run rock bit from 34'-36', or 2' into rock;

set casing for coring.

Spoon 14 27, 32, 41 N = 73 ed gb

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant) c fa

DEPTHELEVATION CLASSIFICATION OF MATERIALS

(Description)

% CORE

RECOV-

ERY

McCook Reservoir Groundwater Monitoring Wells

RQD = 9.6/10.1 = 95%

-26.5

-30.0

-32.5

-35.0

-38.0

-43.0

-45.0

-47.0 bedding plane fracture

RQD = 10.4/10.4 = 97%

Drilling rate: 1.75 min/ft Water loss at 50' while drilling bedding plane fracture high angle fracture high angle fracture high angle fractures open styolite joints open styolite joints open styolite joints

RQD = 0.9/1.5 =60%

Dolomite pieces with some gravel plugged core barrel.

RUN 2

BOX 1

44.5 46.0

RUN 3

BOX 1

BOX 2

46.0 56.4

RUN 4

BOX 2

BOX 3

56.4 66.5

RUN 5

BOX 3

66.5 76.5

RQD = 9.7/10 = 97%

21.0

ELEVATION TOP OF HOLE

McCook Reservoir Main Tunnel

SHEET

Chicago District

INSTALLATION 3PROJECT

SHEETS

DRILLING LOG (Cont Sheet)

PROJECTENG FORM

JUN 67 1836-A LB-121-08

Hole No. LB-121-08

HOLE NO.

OF

McCook Reservoir Main Tunnel

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant) fa

DEPTHELEVATION CLASSIFICATION OF MATERIALS

(Description)

% CORE

RECOV-

ERY

e

BOX OR

SAMPLE

NO.

RQD=95%

RQD=97%

RQD=60%

LEGEND

b gdc

McCook Reservoir Groundwater Monitoring Wells

DEPTH

g

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

RQD=92%

ELEVATION

RQD=97%

a fc e joint partially filled with chalk

CLASSIFICATION OF MATERIALS

(Description)

RUN 6

BOX 3

BOX 4

76.5 86.8

RUN 7

BOX 4

BOX 5

86.8 97.2

-58.0 d

RQD = 9.5/10.3 = 92%

Drilling rate: 1 ft/min

RQD = 10.2/10.2 = 100%

PROJECT

b

McCook Reservoir Main Tunnel

SHEET

OF

HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

PROJECT

Hole No. LB-121-08

SHEETS

4INSTALLATION

Chicago District

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE 21.0

McCook Reservoir Groundwater Monitoring Wells

LEGEND

-90.0

-93.0

-95.0

-88.0

-86.0

RQD = 8.5/10 = 85%

RQD = 8.1/10.2 = 79%

RQD=100%

RQD=85%

RQD=79%

chert content increases

BOX OR

SAMPLE

NO.

100 RUN 8

BOX 5

97.2

107.2 fractures fracture at chert fracture at chert fracture at chert fracture at chert fracture at chert

-89.0

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

RUN 9

BOX 5

BOX 6

107.2 117.4

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE

21.0 Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

% CORE

RECOV-

ERY

116 PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

OF

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH a fc eb gd

SHEETSChicago District

INSTALLATION 5PROJECT

McCook Reservoir Groundwater Monitoring Wells

NO.

e

RQD = 7.1/8.3 = 85%

RQD=95%

RQD=59%

RQD=85%

RQD = 9.3/9.8 = 95%

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH a f

Dolomite (Sugar Run Formation)

Hard, fresh, fine-grained, thickly-bedded, light gray Dolomite; styolites, clay partings few vugs, little chert, less fracturing relative to overlying formation.

RUN 10

BOX 7

117.4 127.2

RUN 11

BOX 7

127.2 129.4

RUN 12

BOX 7

BOX 8

129.4 137.7

RUN 13

BOX 8

137.7 147.7

RQD = 1.3/2.2 = 59%

-100.8 c

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

OF

21.0

ELEVATION TOP OF HOLE

PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

b gd

17 SHEETS

PROJECT 6INSTALLATION

Chicago District

DRILLING LOG (Cont Sheet)

McCook Reservoir Groundwater Monitoring Wells

DEPTH

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

RQD=98%

ELEVATION

RQD = 9.8/10 = 98%

a fc e

Dolomite (Joliet-Romeo Formation)

Medium hard, fresh, fine-grained, thickly bedded, gray to dark gray Dolomite; vuggy, occasional styolites and chert darker color, more vugs relative to overlying formation b

CLASSIFICATION OF MATERIALS

(Description)

-143.0

RUN 14

BOX 9

147.7 158.0

RUN 15

BOX 10

158.0 168.0

RQD=98%

-120.0 g

RQD = 10.1/10.3 = 98%

PROJECT

Hole No. LB-121-08

SHEET

OF

d

HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

PROJECT

17McCook Reservoir Main Tunnel SHEETS

7INSTALLATION

Chicago District

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE 21.0

McCook Reservoir Groundwater Monitoring Wells

RQD = 10.4/10.4 = 100%

-163.0

ELEVATION

RQD = 9.8/10.2 = 96%

White discharge water

-150.4

RQD=96%

RQD=100%

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

Dolomite (Joliet - Markgraf Formation)

Medium hard to hard, fine-grained, dense, light-gray to gray DOLOMITE; occasional vugs and styolites lighter color and little structure relative to overlying formation

% CORE

RECOV-

ERY

RUN 17

BOX 11

BOX 12

178.2 188.6 vertical fracture with pyrite fracture filled with white clay/chalk (+/- 0.4ft thick) wispy bedding

Dolomite (Joliet - Brandon Bridge Formation)

Hard, fresh, fine-grained, dense, gray to dark gray Dolomite; argillaceous, clay partings, occasional vugs thinly bedded and colorful with dark-light bands relative to overlying formation bedding plane fracture

-161.5

RUN 16

BOX 10

BOX 11

168.0 178.2

-159.0

-144.0

CLASSIFICATION OF MATERIALS

(Description)DEPTH

21.0

LEGEND

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE

188 PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

OF

a fc eb gd

17 SHEETS

PROJECT 8INSTALLATION

Chicago District

McCook Reservoir Groundwater Monitoring Wells

NO.

RQD = 10/10 = 100%

RQD = 9.5/10 = 95%

RQD = 7.3/7.6 = 96%

RQD=100%

RQD=95%

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH a large cavity filled with chert c clay-filled joint

RUN 18

BOX 12

188.6 198.6

RUN 19

BOX 12

BOX 13

198.6 208.6

RUN 20

BOX 13

208.6 216.2 e

-188.0

-189.0 f

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

OF

21.0

PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

b gd

ELEVATION TOP OF HOLE

SHEETS

PROJECT 9INSTALLATION

Chicago District

DRILLING LOG (Cont Sheet)

McCook Reservoir Groundwater Monitoring Wells

RQD=97%

-192.0

-192.5

-194.0

-201.0

-203.0

-204.0

-213.0

-214.0 clay-filled joint

RQD = 9.7/10 = 97%

RQD=99%

Dolomite (Kankakee - Plaines Formation)

Hard, fresh, fine-grained, light gray Dolomite, vuggy

Dolomite (Kankakee - Troutman Formation)

Hard, fresh, fine-grained light gray Dolomite thinly bedded, less vugs, lighter color and more chert relative to overlying formation clay-filled joint clay-filled joint large cavity partially filled with chert cavity/joint filled with white clay and possibly broken rock joint filled with clay

RQD=96%

RUN 21

BOX 14

216.2 226.3

RUN 22

BOX 15

226.3 236.3

21.0

JUN 67

RQD = 10/10.1 = 99%

Chicago District

1836-A LB-121-08

DRILLING LOG (Cont Sheet)

McCook Reservoir Main Tunnel

PROJECT HOLE NO.ENG FORM

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

OF

ELEVATION TOP OF HOLE

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH a fc

PROJECT

b gd

17 SHEETS

INSTALLATION

e

McCook Reservoir Groundwater Monitoring Wells

CLASSIFICATION OF MATERIALS

(Description)

RQD=90%

RQD=97%

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

% CORE

RECOV-

ERY

RQD = 9.2/10.2 = 90%

ELEVATION DEPTH

a fc e

Dolomite (Kankakee - Offerman Formation)

Hard, fresh to slightly weathered, light gray Dolomite; vuggy, chert nodules, fossils more chert zones, vugs and cavities relative to overlying formation

LEGEND

-227.5

RUN 23

BOX 15

BOX 16

236.3 246.5

RUN 24

BOX 16

BOX 17

246.5 256.7

RUN 25

BOX 17

256.7 267.0

RQD = 10/10.3 = 97%

RQD = 9.9/10.2 = 97%

b

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

OF

21.0

PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

SHEETS

gd

PROJECT 11INSTALLATION

Chicago District

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE

McCook Reservoir Groundwater Monitoring Wells

-241.2

-243.4

-244.2

-253.5

-262.0

BOX OR

SAMPLE

NO.

100 RQD = 10/10.1 = 99%

RQD = 9.6/10.2 = 94%

RQD=97%

RQD=99%

larger joints and cavities

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant) larger joints and cavities larger joints and cavities larger joints and cavities possibly encounter Kankakee Drummond formation at about 272' (more chert, thicker chert bands)

Chert band (+/- 0.5 ft thick) becomes more finely laminated, darker, with less chert broken rock, bedding plae fractures, and more weathering between about 282 feet and geologic contact

Dolomite (Elwood Formation)

Fine-grained, gray to brownish gray Dolomite;

fossils, occasional chert nodules

-239.7

RUN 26

BOX 17

BOX 18

267.0 277.1

RUN 27

BOX 18

BOX 19

277.1 287.3

RQD=94%

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE

21.0 Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

LEGEND

OF

284 PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH a fc eb gd

SHEETSChicago District

INSTALLATION

12PROJECT

McCook Reservoir Groundwater Monitoring Wells a more weathered, less chert, thin laminations, dark-light banding relative to overlying formation

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)DEPTH fc eb g

ELEVATION

becomes harder, less weathered, more competent

RUN 28

BOX 19

287.3 297.5

RUN 29

BOX 20

297.5 307.8

100 RQD = 9.7/10.2 = 95%

RQD = 10.2/10.3 = 99%

RQD=95%

RQD=99%

PROJECT

McCook Reservoir Main Tunnel

SHEET

OF

d

HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

INSTALLATION

17 SHEETS

Hole No. LB-121-08

Chicago District

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE 21.0

PROJECT

McCook Reservoir Groundwater Monitoring Wells

RQD=100%

LB-121-081836-AJUN 67

ENG FORM HOLE NO.PROJECT

RQD = 10.3/10.3 = 100%

RQD = 10.3/10.3 = 100%

possibly encountered the Wilhlemi formation as indicated by wider dark-light bands

-299.2

McCook Reservoir Main Tunnel dark bands get broader with fewer vugs

RUN 30

BOX 20

BOX 21

307.8 318.1

RUN 31

BOX 21

318.1 328.4

RUN 32

BOX 22

328.4 337.6

McCook Reservoir Main Tunnel

RQD=100%

SHEET

OF

Chicago District

RQD = 9.2/9.2 = 100%

17 SHEETS

PROJECT INSTALLATION

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE 21.0 a

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)ELEVATION DEPTH

Hole No. LB-121-08 fc eb gd

McCook Reservoir Groundwater Monitoring Wells fc eb g

ELEVATION

-322.2

-325.0 rip-up clasts d

Dolomite (Brainard Formation)

BEGIN ORDOVICIAN SYSTEM

Moderately hard, fresh, greenish gray Dolomitic mudstone; laminated greater disturbed/chaotic bedding, more rip-up clasts and fossils than overlying formation fossils rip up clasts

RUN 33

BOX 22

337.6 347.9

RUN 34

BOX 23

347.9 357.7 a

DEPTH

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

OF

21.0

PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

SHEETS

RQD = 9.8/9.8 = 100%

RQD=100%

RQD=99%

RQD=100%

RQD = 10.2/10.3 = 99%

PROJECT 15INSTALLATION

Chicago District

DRILLING LOG (Cont Sheet) ELEVATION TOP OF HOLE

McCook Reservoir Groundwater Monitoring Wells

RQD=100%

RQD = 10/10.1 = 99%

RQD = 10.1/10.1 = 100%

RQD=99%

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

rip up clasts

ELEVATION

RQD = 7.3/7.3= 100%

fossils rip up clasts fossils fossils

RUN 35

BOX 23

357.7 367.8

RUN 36

BOX 23

BOX 24

367.8 377.9

-336.0

-342.2

-346.2

DEPTH

RUN 37

BOX 24

BOX 25

377.9 385.2

ELEVATION TOP OF HOLE

CLASSIFICATION OF MATERIALS

(Description)

Hole No. LB-121-08

McCook Reservoir Main Tunnel

SHEET

OF

a

DRILLING LOG (Cont Sheet)

PROJECT HOLE NO.

McCook Reservoir Main Tunnel LB-121-081836-AJUN 67

ENG FORM

fc eb gd

21.0

17 SHEETS

PROJECT 16INSTALLATION

Chicago District

McCook Reservoir Groundwater Monitoring Wells

ELEVATION

d gb ec f

-364.2 a

RQD=100%

DEPTH

REMARKS

(Drilling time, water loss, depth weathering, etc., if significant)

BOX OR

SAMPLE

NO.

LEGEND

% CORE

RECOV-

ERY

CLASSIFICATION OF MATERIALS

(Description)

END OF BORING @ 385.2 FT. BORING

TREMIE GROUTED TO SURFACE

WITH PORTLAND CEMENT GROUT.

Water level depth (below ground surface) recorded as follows:

11/21/08: 66.6 ft 11/24/08: 22.5 ft 11/25/08: 32.4 ft 11/26/08: 36.1 ft

SHEET

ENG FORM

JUN 67 1836-A LB-121-08McCook Reservoir Main Tunnel

HOLE NO.PROJECT

DRILLING LOG (Cont Sheet)

SHEETS

PROJECT 17INSTALLATION

Chicago District OF

ELEVATION TOP OF HOLE

21.0 Hole No. LB-121-08

McCook Reservoir Main Tunnel

McCook Reservoir Groundwater Monitoring Wells

LITHOLOGICAL LOG

Unconsolidated U d a l Depor l t~

Hydroulk CarduetMty 9roPhk n p n w r r t s the geometric maan

Wornltlc reof d. Lorgd ~ l c u l a r to coandy wggy In nature. &tensely weathered.

Llght gray to dark gmy. Intubadded arenaceoua dnoldal and orgnlaceous dolomlta

Dark ~~ gray to dork b r a n ahda ocwmrf GMB S/or

NOTES: OIEaQDBY CSR S/oc

Rock Dsscdptlons Based on Rsgional Referaces rf CSR 3/m ond Ceophy3lcol Logs. CADnLE SULE & = Slug Test Hydraulk Conductivity uTHLOG.DM; NTS

STS Consultants Ltd. STS PRQ)IECT NO. n x l ~ ~ NO.

Conr~ulting Engineers 27354-XH M W-1

PROJECT: CUP-McCOOK RESERVOIR

=NO. MW-1-99 LOCATION: E 637,475 N 1,864,766

ANCLE: MRTlCAL CASING ELEVATION: 22.42' CCD

DRILLER. BOART LONGYEAR

SIZE & TYPE OF BIT: 5 7/8' DOWNHOLE HAMMER

GROUND ELEVATION: 22.80 FT CCD

McCook Reservoir Groundwater Monitoring Wells

Appendix B

Chicagoland Underflow Plan (CUP) McCook Reservoir Main Tunnel System (MTS) Geotechnical Baseline Report (GBR)

TOC-1

Chicagoland Underflow Plan (CUP) McCook Reservoir Main Tunnel System (MTS)

Table of Contents

List of Acronyms ............................................................................................................................. i

1.0 Introduction and Background .......................................................................................... 1-1

1.1 Introduction ................................................................................................................... 1-1

1.2 Purpose .......................................................................................................................... 1-1

1.3 Relation to the Contract Documents ............................................................................. 1-2

1.4 Organization of this Report ........................................................................................... 1-2

2.0 Project Description ........................................................................................................... 2-1

2.1 Main Tunnel System Components Summary ................................................................ 2-1

2.2 Shafts ............................................................................................................................. 2-2

2.3 Tunnel ............................................................................................................................ 2-2

3.0 Summary of Geological Data ........................................................................................... 3-1

3.1 Sources of Information .................................................................................................. 3-1

3.1.1 Design Phase Subsurface Exploration and Laboratory

Testing Program (AECOM 2008) .......................................................................... 3-1

3.1.2 Subsurface Investigations by Others (1970 – 2000) .............................................. 3-1

3.1.3 Criteria for Data Inclusion ..................................................................................... 3-1

3.1.4 Previous Underground Experience ........................................................................ 3-2

3.2 Regional Geology .......................................................................................................... 3-2

3.3 General Site Geology .................................................................................................... 3-2

3.3.1 Soil ......................................................................................................................... 3-2

3.3.2 Rock ....................................................................................................................... 3-2

3.3.3 Structure ................................................................................................................. 3-3

3.3.4 Groundwater Levels ............................................................................................... 3-4

3.4 Soil Unit Properties ....................................................................................................... 3-4

3.4.1 General ................................................................................................................... 3-4

3.4.2 Fill .......................................................................................................................... 3-4

3.4.3 Alluvium and Glacial Deposits .............................................................................. 3-4

3.5 Rock Unit Properties ..................................................................................................... 3-4

3.5.1 General ................................................................................................................... 3-4

3.5.2 Rock Weathering ................................................................................................... 3-5

McCook Reservoir Groundwater Monitoring Wells

TOC-2

3.5.3 Equivalent Hydraulic Conductivity ....................................................................... 3-5

4.0 Characterization and Behavior of Engineering Geological Units .................................... 4-1

4.1 Properties and Behavior of Engineering Units – Soil ................................................... 4-1

4.1.1 Soil Classification .................................................................................................. 4-1

4.2 Properties and Behavior of Engineering Units – Rock ................................................. 4-2

4.2.1 Engineering Rock Unit .......................................................................................... 4-3

4.2.2 Discontinuity Orientation....................................................................................... 4-3

4.2.3 Joint Spacing .......................................................................................................... 4-4

4.2.4 Excavation and Support Classes ............................................................................ 4-4

5.0 Construction Considerations for Construction Shaft (Contractor Option) ...................... 5-1

5.1 Construction Shaft ......................................................................................................... 5-1

5.1.1 Drill and Blast for Shaft Excavation ...................................................................... 5-1

5.1.2 Ground Support ...................................................................................................... 5-1

5.2 Groundwater .................................................................................................................. 5-2

6.0 Construction Considerations for Tunneling ..................................................................... 6-1

6.1 Anticipated Tunneling Conditions ................................................................................ 6-1

6.1.1 Drill and Blast Tunneling ....................................................................................... 6-1

6.2 Ground Support ............................................................................................................. 6-1

6.3 Estimated Groundwater Inflows .................................................................................... 6-1

6.4 Grouting ........................................................................................................................ 6-2

7.0 References ........................................................................................................................ 7-1

Tables

Table 4-1 Soil Engineering Unit Baselines ................................................................................ 4-2

Table 4-2 Engineering Rock Unit – Baseline Intact Rock Properties ....................................... 4-3

Table 4-3 Summary of Joint Set Baselines ................................................................................ 4-3

Table 4-4 Summary of Joint Spacing Classes ............................................................................ 4-4

Table 4-5 Summary of Joint Set Spacing Observations ............................................................ 4-4

Table 4-6 Relationship between E&S Classes and RMR .......................................................... 4-4

Table 6-1 Estimated Support Class Quantities .......................................................................... 6-1

Attachments

Attachment A Construction Shaft – Contractor Option – Ground Profile i

List of Acronyms B&V Black & Veatch

BTS Brazilian tensile strength

CCD Chicago City Datum

CUP Chicagoland Underflow Plan

DSC differing site conditions

E&S Excavation and Support

GBR Geotechnical Baseline Report

GDR Geotechnical Data Report

HPU hydraulic power unit

ID inside diameter

LASMA Lawndale Avenue Solids Management Area

MGS Main Gate/Access Shaft

MTS Main Tunnel System

MWRDGC Metropolitan Water Reclamation District of Greater Chicago

RMR Rock Mass Rating

RQD Rock Quality Designation

SWRP Stickney Water Reclamation Plant

TARP Tunnel and Reservoir Plan

UCS unconfined compressive strength

USACE United States Army Corps of Engineers

1-1

1.0 Introduction and Background

1.1 Introduction

This Geotechnical Baseline Report (GBR) describes geotechnical conditions that can be assumed during construction of the new Chicagoland Underflow Plan (CUP) 33 ft internal diameter (ID)

McCook Main Tunnel System (MTS), approximately 1,600 ft in length, located in Chicago, Illinois. The project is being designed by Black & Veatch Corporation (B&V) on behalf of the

USACE, Chicago District.

Refer to the project Geotechnical Data Report (GDR) prepared by B&V for the McCook

Reservoir Main Tunnel System for the project location, tunnel alignment and shaft location figures.

1.2 Purpose

This GBR provides information relevant to subsurface conditions, referred to as the baseline conditions. The purpose of the GBR is to:

• Set baselines for geotechnical conditions and material behavior assumed to be encountered during construction shaft excavation and tunnel excavation.

• Identify important construction considerations, key project constraints, and selected requirements to be addressed by the Contractors during bid preparation and construction.

The contractual baselines do not represent warranties by the Government of the actual subsurface conditions that will be encountered by the Contractor. Rather, the purpose of the baselines is to translate the results of geotechnical investigations into clear descriptions of subsurface conditions. Nothing in this GBR limits the rights of the Government should a claim arise for differing site conditions (DSC).

The GBR is based upon several assumptions regarding the sequence of construction, the means and methods, and workmanship to be employed by the Contractor. The anticipated behavior of subsurface materials as described herein will be influenced by the means and methods selected and used during construction by the Contractor; and therefore, behavior may vary from that described in this report. The Contractor must evaluate the soil and groundwater conditions described herein as they relate to, and interact with, the means and methods selected by the

Contractor for construction.

Any means and methods proposed by the Contractor where the Contractor believes the baseline becomes invalid or requires modification must be raised and discussed during the bid phase prior to bid opening. The Contractor has a duty to inform the Government of the baselines the

Contractor believes are invalid, or require modification during the bid phase.

McCook Reservoir Groundwater Monitoring Wells

1-2

1.3 Relation to the Contract Documents

This GBR references the GDR prepared by B&V for the McCook Reservoir MTS. The GDR presents details of the project field investigation completed in 2008 by AECOM and results of twenty previous investigations completed between 1970 and 2000 at or near the McCook

Reservoir site. Also included as part of the GDR are the results of the laboratory testing performed on soil and rock samples collected during the investigation(s), including detailed descriptions of the field and laboratory testing data, methods, and procedures. Boring logs and a summary table of laboratory test results and histograms depicting the distribution of various laboratory testing data are presented in the GDR. This GBR and the GDR are provided as information for the Contractor and are included in the Contract Documents. If there are any inconsistencies between the GBR and the GDR, the GBR shall take precedence.

This GBR is not intended to present the minimum required design and standards of construction contained in the Plans and Specifications. Nothing in this GBR should be construed as amending or altering the Plans and Specifications or applicable FAR clauses, or relaxing the standards of construction

The technical concepts, terms, and descriptions in this report follow standards commonly used in geotechnical engineering/engineering geology which have specific meaning pertaining to the work. Bidders should have a qualified geotechnical engineer or qualified engineering geologist carefully review this GBR so that a complete understanding of the information presented in this report is developed prior to submitting a bid.

1.4 Organization of this Report

This GBR broadly follows the principles contained in the ASCE document entitled

“Geotechnical Baseline Reports for Construction”, dated 2007 and is comprised of an

Introduction and Background (Section 1.0) and the following six sections (Section 2.0 to Section

7.0) as detailed below:

• Section 2.0 (Project Description) presents detailed descriptions about the project location, purpose, components, and requirements.

• Section 3.0 (Summary of Geological Data) describes the project setting including geological considerations and a summary of the available data from the GDR.

• Section 4.0 (Characterization and Behavior of Engineering Units) presents the characterization and behavior of material types present along the project alignment, including behavior of the different engineering units classified on the project.

• Section 5.0 (Construction Considerations for Shafts) presents the optional shaft construction considerations.

McCook Reservoir Groundwater Monitoring Wells

1-3

• Section 6.0 (Construction Considerations for Tunneling) presents the tunnel construction considerations.

• Section 7.0 (References).

2-1

2.0 Project Description

The purpose of the McCook Reservoir project is to reduce flood damages in the greater Chicago combined sewer system area. The McCook Reservoir is part of the larger CUP, which includes tunnels for storm water storage and conveyance, and reservoirs for storm water storage. The

CUP is also known as the Tunnel and Reservoir Plan (TARP).

McCook Reservoir will be located in a limestone/dolomite quarry, with nearly vertical pre-split perimeter walls. The reservoir will have two stages (Stage 1 invert at El. -284 CCD, Stage 2 invert at El. -279 CCD), separated by a weir (top El. -200 CCD). Minor storm events will be contained in the tunnel system (Mainstream and Des Plaines Tunnels).

The existing Mainstream Tunnel (1982) is 33 ft ID circular tunnel with 1 ft thick unreinforced concrete lining. The Main Tunnel which will be constructed under this project contract is a 33 ft

ID tunnel with reinforced concrete lining and will connect the McCook Reservoir to the existing

Mainstream Tunnel. Controlling gates will be installed in the MGS at the midpoint between the reservoir and Mainstream Tunnel to regulate the inflow of storm water.

The McCook Reservoir main gates will comprise of three 14.5 ft by 29.5 ft (opening size) wheel gates on each of the bifurcations within the MTS located in the MGS. The gates will control flow from the existing TARP tunnel into the reservoir. The main gates (center gates) will be designed to seal in either direction. The upstream guard gates (located on the mainstream tunnel side) will be designed to seal against hydrostatic head on the upstream side. The downstream guard gates

(located on the reservoir side) will be designed to seal against hydrostatic head on the downstream side. Additional gates and valves in the Distribution Tunnel System direct the flow to and from the reservoir and to the Stickney Water Reclamation Plant (SWRP) through the existing conveyance tunnels.

2.1 Main Tunnel System Components Summary

The purpose of the McCook Reservoir Main Tunnel System (MTS) is to connect the Mainstream

Tunnel to the McCook Reservoir. The MTS includes the following components:

Main Tunnel – An approximately 1,600 ft long, 33 ft ID tunnel connecting the Mainstream Tunnel and the McCook Reservoir, bifurcated for approximately 290 ft through the MGS.

Main Gate/Access Shaft (MGS) – An 88 ft ID, approximately 295 ft below grade circular shaft located near the midpoint of the Main Tunnel. The MGS is currently under construction under a separate contract (W912P6-09-C-0026).

McCook Reservoir Groundwater Monitoring Wells

2-2

Construction Shaft – Contractor Option – An optional, 25 ft ID, approximately 285 ft below grade shaft located approximately 300 ft downstream of the Main Tunnel/Mainstream Tunnel Connection.

Gates – Six rectangular steel wheel gates and the associated gate control structures located in the MGS. Each bifurcation of the Main Tunnel contains one main gate and two guard gates - one upstream and one downstream of the main gate. The gates and associated gate control structures are currently being manufactured under a separate contract (W912P6-08-C-0023)

Main Tunnel/Mainstream Tunnel Connection – Live connection of the Main Tunnel to the existing Mainstream Tunnel.

Main Tunnel/McCook Reservoir Connection – Portal connection of the Main Tunnel to the McCook Reservoir, including construction of an Energy Dissipation Structure.

Control Building – A surface facility located at the MGS that houses the gate operating controls, hydraulic power units (HPUs) and provides limited storage.

2.2 Shafts

The MGS, located at STA 0+00, is being constructed under a separate contract (W912P6-09-C-

0026) which will be completed prior to execution of the MTS contract. Site access, working parking, and construction offices will be located at the MGS.

An optional 25 ft ID, approximately 285 ft deep Construction Shaft located at STA. 5+41E to help complete the tunnel and aid with construction of the live connection to the Mainstream

Tunnel may be utilized by the Contractor depending on the means and methods elected in his technical approach.

The optional Construction Shaft is anticipated to be excavated using a combination of mechanical equipment above the top of rock and blasting methods below the top of rock.

2.3 Tunnel

The approximately 1,600 ft tunnel shall be excavated from the MGS. The Construction Shaft

(Contractor Option) may be used for construction purposes if elected by the Contractor.

For the purposes of this GBR, the tunnel is assumed to be excavated by drill and blast methods at a grade of approximately 0.18 percent sloping from the Mainstream Tunnel (highest invert elevation) to the McCook Reservoir (lowest invert elevation).

3-1

3.0 Summary of Geological Data

Twenty subsurface investigations from 1970 to 2000 have been conducted within or near the

McCook Reservoir. A summary of the data including the design subsurface investigation conducted specifically for the MTS (AECOM 2008) is included below.

3.1 Sources of Information

3.1.1 Design Phase Subsurface Exploration and Laboratory Testing Program

(AECOM 2008)

The design phase subsurface exploration program was completed in July 2008 and consisted of three test borings designated LB-121-08, LB-122-08, and LB-123-08. The design phase subsurface exploration program consisted of drilling conventional test borings, performing downhole geophysical (acoustic and optical televiewer) logging, field conductivity tests, and installing groundwater monitoring wells and piezometers. Locations of test borings completed during the design phase exploration program are included in the project GDR and are shown on the Contract Drawings. For the results of the design phase subsurface exploration and laboratory testing program, refer to the project GDR.

3.1.2 Subsurface Investigations by Others (1970 – 2000)

Twenty subsurface investigations in the general vicinity of the proposed MTS have been completed since 1970 to aid in the design and construction of the McCook Reservoir and MTS.

Refer to the project GDR for a complete listing of the previous subsurface explorations and laboratory testing programs.

3.1.3 Criteria for Data Inclusion

Roughly 419 borings and numerous reports for various geotechnical/geological investigations have been completed to gather subsurface information in the general vicinity of the McCook

Reservoir. For purposes of this report, the data has been culled and analyzed, as follows.

All 419 borings were utilized for soil and rock unit properties.

Eight borings; (as described in the project GDR) LB 121-08, LB 122-08, LB-123-08, 156-

B1, LB 101-98, LB 106-98, MW-1-99, and OW-1 and their associated in situ and laboratory test data were utilized for lithology, groundwater, engineering unit baselines, RMR, and

RQD. The eight borings were chosen based on their proximity (within 650 ft) to the MTS project site and their penetration into rock.

The McCook Haul Tunnels Design Project Report dated September, 2001 and prepared by

URS Corporation was utilized for purposes of defining and baselining structural and discontinuity data.

McCook Reservoir Groundwater Monitoring Wells

3-2

Refer to the project GDR for the individual borings logs and in situ, laboratory and structural data referenced above.

3.1.4 Previous Underground Experience

Refer to the McCook MTS GDR for a listing of previous underground construction experience near the McCook Reservoir project site.

3.2 Regional Geology

The project site lies on the eastern flank of the northwestward trending Kankakee Arch and is covered by a sequence of glacial drift deposits underlain by approximately 4,000 ft of Cambrian-to Silurian-aged sedimentary rock which in turn is underlain by Precambrian-aged crystalline rock.

The Cambrian- to Silurian-aged sedimentary rock of the Kankakee Arch consist of various dolomite, shale and sandstone formations underlain by Precambrian-aged crystalline rock which is located significantly below the floor of the quarry/reservoir.

The rock in the project vicinity is generally overlain by a sequence of fill, alluvial deposits, and glacial drift deposits (youngest to oldest).

3.3 General Site Geology

3.3.1 Soil

In general, the soil stratigraphy in the project area consists of Fill, Alluvium, and Glacial deposits. Fill has been placed overlying the native materials as a result of channelization, dredging, and construction of the Metropolitan Water District of Greater Chicago’s (MWRDGC)

Lawndale Avenue Solids Management Area (LASMA), and other local construction.

The rock surface in the vicinity of the project site is generally classified as “slightly weathered” to “fresh”.

Detailed descriptions of the Fill, Alluvium, and Glacial deposits (including glacial till) are presented in Section 3.4.

3.3.2 Rock

3.3.2.1 Lithology

The rock underlying the project alignment consists of lithologies belonging to the Racine, Sugar

Run, Joliet, Kankakee, Elwood, and Wilhelmi Formations. A detailed description of the formations is presented in the McCook Main Tunnel System GDR.

McCook Reservoir Groundwater Monitoring Wells

3-3

Racine Formation – the primary lithology of the Racine Formation as seen from the borings is a moderately hard to hard, slightly weathered, fine-grained, light gray-to-gray dolomite. This formation contains stylolites and stylolitic joints, chert bands and nodules, vugs, and pits.

Sugar Run Formation – The primary lithology of the Sugar Run Formation as seen from the borings is a hard, fresh, fine-grained, massive, light gray dolomite with stylolites, clay partings, and few to trace vugs and chert nodules.

Joliet Formation – The primary lithology of the Joliet Formation as seen from the borings is a medium hard, fresh, very fine-grained, thickly-bedded, gray to dark gray dolomite, with vugs and occasional stylolites.

Kankakee Formation – The primary lithology of the Kankakee Formation as seen from the borings is a medium hard to hard, slightly weathered, fine-to-medium grained, dark brown to gray dolomite with clay partings, vugs, chert nodules and bands, and fossils.

Elwood Formation – The primary lithology of the Elwood Formation as seen from the borings is a moderately hard, fresh, fine to medium grained, thinly-banded, gray to brownish-gray dolomite with black clay partings, fossils and occasional chert nodules.

Wilhelmi Formation – The primary lithology of the Wilhelmi Formation as seen from the borings is a moderately hard, fresh, very fine-grained, thinly bedded, argillaceous, dark gray to black dolomite.

3.3.3 Structure

Structure of the rock in the project area is defined by bedding and jointing discontinuities with bedding being the more prominent of the two (URS, 2001).

For purposes of this report, bedding is defined by a change in formation type through the stratigraphic sequence. Formations are presented in Section 3.3.2.1 and are generally defined by similar characteristics (mineralogy, depositional environment, fossil type). Bedding changes are frequently gradational rather than distinct and commonly occur within the same vertical elevation (approximately 10 to 20 ft) across the project site.

Since 1991 two major joint sets have been extensively mapped and recorded in the project area.

For purposes of this report the two joint sets will be labeled J1 and J2 and their orientation, dip and spacing is presented in Section 4. Refer to the project GDR for more detailed description of the joints.

McCook Reservoir Groundwater Monitoring Wells

3-4

3.3.4 Groundwater Levels

Groundwater levels, from the eight borings (Section 3.1.3), near the optional Construction Shaft and proposed tunnel alignment ranged from El. -1.5 to -42.1 CCD and were generally obtained at the start of the drilling operations each day.

Groundwater level fluctuations occur with time and seasonal change due to variations in precipitation, evaporation, surface water runoff, and local dewatering.

3.4 Soil Unit Properties

3.4.1 General

A general description of the various soil units and their engineering properties is provided in this section. Anticipated behavior of the various soil units relative to optional Construction Shaft is described in Section 4. Soil sampling was conducted on the eight borings (Section 3.1.3) near the project site.

3.4.2 Fill

Man-made Fill near the project site is generally associated with dredging neighboring water bodies and previous construction or paving activities. Onsite Fill generally consists of asphalt, limestone base course, silty clay, silty sand, sand and trace gravel, roots and organics.

3.4.3 Alluvium and Glacial Deposits

Alluvium and Glacial deposits are present below the Fill and were seen in all the design phase borings. These deposits generally consist of organic clay, silty clay, fine to coarse sand and gravel, silt, sandy silt, silty sand, sandy clay, gravel, sandy gravel, cobbles and boulders.

Differentiating between the Alluvium and Glacial deposits in the borings was not always possible and for purposes of the GBR they are grouped together. Deposits generally varied in thickness from 21 ft (LB-122-08) to 36 ft (LB-101-98).

3.5 Rock Unit Properties

3.5.1 General

Data from laboratory tests conducted on samples of intact rock from design phase borings, and from previous laboratory testing on past borings, are presented in the project GDR. The purpose of this testing was to obtain information on the unconfined compressive strength (UCS) and the

Brazilian tensile strength (BTS) tests. All the laboratory data is summarized in tabular form in the project GDR. Also presented in the GDR are a series of scatter plots for the various laboratory tests, including RQD. Analysis of these histograms shows intact rock properties do not vary significantly by formation or by location within the project area. Baseline values for the intact rock properties are presented in Section 4.

McCook Reservoir Groundwater Monitoring Wells

3-5

3.5.2 Rock Weathering

In general, the weathering profile of the top of rock shows slight weathering grading to fresh with depth.

For purposes of this report, the top of rock is defined as the elevation or depth at which continuous rock mass is encountered. Rock and top of rock for construction purposes are defined in Section 31 00 00 – Earthwork.

3.5.3 Equivalent Hydraulic Conductivity

Equivalent rock mass hydraulic conductivity (k) was evaluated based on the results of 66 water pressure tests conducted in the design phase test borings as summarized in the project GDR.

Review of k values relative to geologic formation, depth below top of rock, and location along the tunnel alignment was undertaken to determine if correlations existed to facilitate predictions of water inflow during construction. Evaluation shows no clear correlations between geologic formation and equivalent hydraulic conductivity, or depth below top of rock and equivalent hydraulic conductivity. No tests showed a k value greater than 10-3 cm/sec and twelve tests

(18%) measured k values greater than 10-4 cm/sec.

4-1

4.0 Characterization and Behavior of Engineering Geological Units

4.1 Properties and Behavior of Engineering Units – Soil

The material descriptions of the soil units designated for this project, which include Fill, Alluvium, and…