Attachment C Figures for HAHD Drain Maintenance.pdf

PDF 872 KB Posted Aug 29, 2024

Attached to: Howard A. Hanson Dam Relief Tunnel Drain Maintenance
Solicitation number: W912DW24Q0028
Issued by: Department of the Army Corps of Engineers Engineering District Seattle

About this file

Written by GovTribe AI · Aug 29, 2024

This document consists of attachments related to a federal contract opportunity issued by the U.S. Army Corps of Engineers, Seattle District for the Howard A. Hanson Dam (HAHD) Relief Tunnel Drain Cleaning.

The key details are:

The contract requires the contractor to provide all supervision, labor, equipment, and materials to perform drainage tunnel drain camera inspections, cleaning, decommissioning, and repairs at the HAHD site.
The attachments include figures showing the existing drainage tunnel system, a geologic profile, and a site map.
A site visit is scheduled for September 10, 2024 at 9:00 AM Pacific Time for vendors to inspect the site.
Additional attachments provide more details on decontamination, drain cleaning logs, drain as-builts, and other relevant information.

View the file

Other files

File	Type	Posted
Amendment W912DW24Q0028 0001.pdf	PDF	Sep 12, 2024
Amendment 0001 Atch 1 Site Visit Attendance Sheet.pdf	PDF	Sep 12, 2024
Attachment E HAHD Drainage Tunnel Horizontal Well As Builts.pdf	PDF	Aug 29, 2024
W912DW24Q0028 HAHD Relief Tunnel Drain Cleaning.pdf	PDF	Aug 29, 2024
Attachment D HAHD Drainage Tunnel Vertical Drain As Builts.pdf	PDF	Aug 29, 2024

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Attachment C:

Figures for

HAHD Drain

Maintenance

TRANSITION FROM GRAVEL TO AC

" C

U L

V E

R T

Spur

6’-7’H CHAINLINK W/

BARBED WIRE TOP

BLDG.

EAVES

WIER B3

EXISTIN

A D

ISTR

TIO

B U

ILD

B L D

BUI

LDI

BUILDING

TUNNEL WIER

133 123

102A

41A

T H

SHAFT

VENTILATION

SHAFT

VENTILATION

T W

26138

THD1

THD2

THD3

T H

D 7T

H D

T H

THD11

T H

THD1

THD18

T H

U .S .A

R M

E N

T R

T ,S

E A

T T

L E

P r e p a r e d b y

D r a w n b y

S E

A T

T L

W A

S H

G T

O e s ig n e d b y

C h e c k e d b y

D a t e

S y m b o l

F il v

Seattle District

US Army Corps of Engineers

Sheet of e s c r ip t io n D a t e

D e s c r ip t io n A p p r

C O

R P

E E

1 2 3 4 5

O T

T E

D E

S I

L E

C A

S h e e t s

H H

I m a g e d u r i n g c o n s t r u c t i o n

D G

H H

T R

L O

A B

D G

N number:

Plate

A REDUCED PRINT. REDUCE SCALE ACCORDINGLY.

IF SHEET MEASURES LESS THAN 22" X 34" IT IS

G R

S H

G T

O N

H O

W A

H A

N S

D R

N N

E L

P R

O V

E M

E N

T S

N 103400

N 103200

B-101

EXISTING HORIZONTAL DRAIN, TYP

N 103600

T U

N N

A N

E X

A G

E B

N E

S W

A N

S O

D A

L S

O N

DRAINAGE TUNNEL

EXISTING

1" = 30’ 030’ 15’ 30’ 60’

LEGEND

THD5

EXISTING PIEZOMETER

EXISTING TUNNEL VENTILATION SHAFT

EXISTING TUNNEL HORIZONTAL DRAIN

NEW DRAINAGE WELL

NEW HORIZONTAL DRAINTHD25

STA 16+48

END OF TUNNEL

ACCESS ROAD "A"

STA 10+08

PORTAL

B-201

WELL (TO BE LINED)

EXISTING TUNNEL DRAINAGE

A E

C H

A N

T E

R0004

COPY OF

TW275

T W

R E

B U

AS-BUILT

A S

B U

8. THD 2,8,9,13,14 ABANDONED IN PLACE

PER RFI 0006

7. PIEZOMETER 15, 128, AND 130 ARE FLUSH MOUNT

AFTER THEY ARE COMPLETED.

SURFACE SHALL BE REPAIRED OVER TW267 AND TW268

FLUSH MOUNT TRAFFIC BOXES. THE ASPHALT ROAD

6. TW267, TW268 AND TW269 SHALL BE COMPLETED WITH

REPAIRED AFTER COMPLETION OF LINER INSTALLATION.

WELL 26 IS BELOW ASPHALT. ASPHALT SHALL BE

5. THE SURFACE MONUMENT FOR EXISTING TUNNEL

THE WATER TABLE ABOVE THE INVERT OF THE TUNNEL.

POOL STORAGE OR RAIN EVENTS THAT MAY RAISE

MAY BE USED FOR DEWATERING DURING CONSERVATION

4. NEW VERTICAL DRAINS IN THE DRAINAGE TUNNEL

STATE PLANE COORDINATE SYSTEM, NAD27, NORTH ZONE.

3. HORIZONTAL CONTROL BASED ON THE WASHINGTON

SA., 47.

2. VERTICAL CONTROL BASED ON N.G.V.D., 1929 GA.,

DRAIN SCHEDULES.

1. SEE PLATE B-601 FOR VERTICAL & HORIZONTAL

NOTES:

FROM TW (TYPICAL)

@ 10’ OFFSET

SAMPLING HOLES

GEOTECHNICAL

R E

B U

FIGURE 1

BEDROCK

AQUITARD

LOWER AQUIFER

A P

P R

O X

A T

E E

L E

V A

N I

N F

E E

A P

P R

O X

A T

E E

L E

V A

N I

N F

E E

14001400

11+0012+0013+0014+0015+0016+00 10+00

B E

N D I

N T

U N

N E

W ) 3

EL. 1095.08

S T

O R

T A

E N

D O

F T

U N

N E

B E

N D I

N T

U N

N E

STATIONING ALONG TUNNEL CENTERLINE

LANDSLIDE

FLUVIAL

SILT

UPPER AQUIFER

VENTILATION

HOLE

36 AND 140

T W -2

.S .A

T R

T ,S

E A

T T

L E

P r e p a r e d b y

D r a w n b y

S E

A T

T L

W A

S H

G T s ig n e d b y

C h e c k e d b y

D a t e

S y m b o l

F il v

Seattle District

US Army Corps of Engineers

Sheet of e s c r ip t io n D a t e

D e s c r ip t io n A p p r

C O

E E

1 2 3 4 5

O T

T E

D E

S I

L E

C A

S h e e t s

H H

I m a g e d u r i n g c o n s t r u c t i o n

D G

H H

T R

P R

A B

D G

N number:

Plate

A REDUCED PRINT. REDUCE SCALE ACCORDINGLY.

IF SHEET MEASURES LESS THAN 22" X 34" IT IS

G R

S H

G T

O N

H O

W A

H A

N S

D R

N N

E L

P R

O V

E M

E N

T S

B-201

E B

N E

S W

A N

S O

A B-101

1" = 30’

030’ 15’ 30’ 60’

E B

N E

D A

L S

N N

E L

G E

O L

O F

SURFACE

EXISTING GROUND

BULKHEAD SLOT

ROCK PORTAL

(TYP)

EXISTING WELL

(TYP)

PROPOSED WELL

WITH PIEZOMETER IN PLACE

WELL 25 PREVIOUSLY GROUTED

SEE NOTE 5

8" PIPE RISER @ 15’ O.C.,

8" PERFORATED PIPE AND

EXISTING

SEE NOTE 5

8" DRAIN PIPE,

R E

L L

O U

T S

A E

5. 8" FLOOR DRAIN TO BE DECOMMISSIONED IN ACCORDANCE WITH THE SPECIFICATIONS.

PROPERTIES OF SUBSURFACE MATERIALS.

4. SEE GEOTECHNICAL BASELINE REPORT (GBR) FOR DESCRIPTIONS AND ENGINEERING

3. DEPTHS OF EXISTING DRAINS CONSIDERED APPROXIMATE AND ARE TO BE FIELD VERIFIED.

2. PRESENCE OF SILT AQUITARD MAY NOT BE CONTINUOUS ALONG TUNNEL ALIGNMENT.

1. GEOLOGIC CONTACTS ARE APPROXIMATE.

NOTES:

A E

R E

T E

R0003

COPY OF

R E

B U

AS-BUILT

A S

B U I L

R E

B U

GEOLOGIC PROFILE

EXISTING TUNNEL

FIGURE 2

DRAINAGE TUNNEL LAYDOWN AREA AND SETTLING PONDS

HOWARD A. HANSON DAM

RAVENSDALE, WASHINGTON

PA-2A

Street Parking

LAYDOWN AREA

DRAINAGE TUNNEL

PORTAL

SETTLING PONDS

ACCESS ROAD

HOWARD A. HANSON

DAM

ADMINISTRATION

BUILDING

Figure 3

NORTH

Attachment C Figures for HAHD Drain Maintenance

HAHD Drainage Tunnel Well Maintenance PWS Figure 1

HAHD Drainage Tunnel Well Maintenance PWS Figure 2

HAHD SIte Map Figure 3

Slide Number 1

File details come from the government source that posted it. Updated Aug 29, 2024.