B-4852 ALAMITOS BAY ENTRANCE CHANNEL DREDGE_20250606.pdf

PDF 7 MB Posted Jul 24, 2025

Attached to: R-7246 ALAMITOS BAY ENTRANCE CHANNEL DREDGING
Solicitation number: PW-25-642
Issued by: California

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Written by GovTribe AI · Jun 3, 2026

Alamitos Bay Entrance Channel Maintenance Dredging and Beach Nourishment - Construction Plans

These construction plans prepared for the City of Long Beach detail a maintenance dredging and beach nourishment project at Alamitos Bay Entrance Channel in Seal Beach, California. The project involves dredging the entrance channel to a depth of -18 feet Mean Lower Low Water (MLLW), with provisions for one foot of paid overdredge to -19 feet and a bid additive option for two additional feet of paid overdredge to -21 feet. The dredged material, excluding debris, will be hydraulically placed at an identified beach nourishment area with a target elevation of +10 feet MLLW and side slopes ranging between 20H:1V minimum to 20H:3V maximum. The project includes multiple basins within Alamitos Bay (Basins 1, 2, and 5) and an entrance channel dredge boundary defined by nine control points with specific state plane coordinates. Critical project constraints include environmental closure windows tied to project permits, avoidance of existing eelgrass areas where no dredging, anchoring, or spudding is permitted, and material from the EC-DU1 area must be dredged first and placed at the beach nourishment area nearest the north jetty. All work must comply with federal, state, and local permits, with the most stringent conditions applied where permit requirements vary.

The contractor assumes full responsibility for construction means, methods, site conditions, public safety, traffic control, utility coordination, and debris removal. Dredged material must reach the required -18 feet elevation in all areas for acceptance as complete, with excessive dredging below the non-pay overdredge limit of -22 feet prohibited and subject to regulatory fees and potential structural damage liability. Debris encountered during work must be segregated and disposed of at contractor-selected, owner-approved upland commercial landfill locations in accordance with federal, state, and local regulations. The contractor is responsible for installing and maintaining public safety measures including signage, barricades, and spotters around placement and staging areas. If hydraulic dredging is used, the pipeline must be primarily located outside the entrance channel except for the dredge attachment, fully submerged within navigation channels with buoy markers, and routed to avoid eelgrass disturbance. The contractor must propose a safe pipeline crossing route over the western jetty that maintains public safety and allows continuous vehicle access to the 72nd Place lifeguard station.

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T01

TITLE SHEET 1

NOTES:

1. HORIZONTAL DATUM: CALIFORNIA STATE PLANE

ZONE 5, NAD83, U.S. SURVEY FEET

2. VERTICAL DATUM: FEET MLLW, NTDE 1983-2001.

Ju n

, 2

pm c he w et t

K :\P ro je ct s\

-C ity o f L on g

Be ac h\ Al am ito s B ay

E nt ra nc e Ch an ne l\C on st ru ct io n Pl an s\

P L

dw g T0

ALAMITOS BAY ENTRANCE CHANNEL MAINTENANCE

DREDGING AND BEACH NOURISHMENT

CITY OF LONG BEACH

DRAWING INDEX

SHEET # DRAWING # TITLE

1 T01 TITLE SHEET

2 G01 GENERAL NOTES

3 G02 EXISTING CONDITIONS

4 C01 DREDGE PLAN VIEW (1)

5 C02 DREDGE PLAN VIEW (2)

6 C03 DREDGE CROSS SECTIONS (1)

7 C04 DREDGE CROSS SECTIONS (2)

8 C05 DREDGE CROSS SECTIONS (3)

9 C06 DREDGE CROSS SECTIONS (4)

10 C07 BEACH NOURISHMENT AREA

11 C08 PROPOSED DREDGING PIPELINE ROUTE

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

SCALE IN FEET

1000 2000

NORTH

LOCATION MAP SITE MAP

PROJECT

SITE

SCALE IN FEET

1000 2000

NORTH

SCALE IN MILES

1 2

NORTH

BASEMAP: ESRI 2024 AERIAL IMAGERY: ESRI 2024

SITE LOCATION

PACIFIC OCEAN

E OCEAN BLVD

ALAMITOS

BAY

PACIFIC COAST HWY

BEACH

NOURISHMENT

AREA

STAGING

AREA

michael.lau Text Box B-4852

G01

GENERAL NOTES 2

Ju n

, 2

pm c he w et t

K :\P ro je ct s\

-C ity o f L on g

Be ac h\ Al am ito s B ay

E nt ra nc e Ch an ne l\C on st ru ct io n Pl an s\

P L

dw g G0

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

DETAIL AND SECTION REFERENCING

DETAIL REFERENCE NUMBER

DRAWING ON WHICH DETAIL APPEARS

"-" INDICATES TYPICAL OR ON SAME DRAWING

DETAIL REFERENCE NUMBER

SECTION "A" IS SHOWN ON DRAWING "C02"

INDICATES DIRECTION

OF CUTTING PLANE

SECTION REFERENCE LETTER

C01

SCALE:

DETAIL1

C01 1" = 10'

A C02

SCALE:

SECTIONA

C01 1" = 10'DRAWING NUMBER WHICH SECTION WAS TAKEN

ABBREVIATIONS:

' FEET, MINUTES

" INCHES, SECONDS

° DEGREES

# NUMBER

APPROX APPROXIMATE

ASTM AMERICAN SOCIETY FOR TESTING AND MATERIALS

BM BENCHMARK

BMP BEST MANAGEMENT PRACTICE

CY CUBIC YARDS

DWG DRAWING

E EAST, EASTING

ELEV ELEVATION

EX EXISTING

FT FEET

FG FINISHED GRADE

H HORIZONTAL

L LENGTH

LF LINEAR FEET

MAX MAXIMUM

MIN MINIMUM

MLLW MEAN LOWER LOW WATER

N NORTH, NORTHING

NAD NORTH AMERICAN DATUM

NAVD NORTH AMERICAN VERTICAL DATUM

NTDE NATIONAL TIDAL DATUM EPOCH

NTS NOT TO SCALE

OD OVERDREDGE

PE PROFESSIONAL ENGINEER

ROW RIGHT-OF-WAY

STA STATION

TESC TEMPORARY EROSION AND SEDIMENT CONTROL

TOW TOP OF WALL

TYP TYPICAL

USCG UNITED STATES COAST GUARD

V, VERT VERTICAL

W/ WITH

WSEL WATER SURFACE ELEVATION

YR YEAR

CONTROL POINTS

FOR DREDGE BOUNDARY

POINT #

NORTHING

1726727.14

1726583.49

EASTING

6524689.05

6524951.82

1729634.72

1729777.14

6526652.63

6526672.75

1731121.39

1730761.86

6526385.89

6526155.86

1730038.04

1729862.23

6526310.32

6526313.22

9 1729578.46 6526277.85

CONTROL POINTS FOR

BEACH NOURISHMENT

POINT #

NORTHING

1730454.91

1730207.59

EASTING

6524378.72

6524449.40

1729962.75

1729196.20

6524859.04

6525835.27

1729302.97

1729388.98

6525852.78

16 1730054.45 6524993.40

NOTES

1. CONTRACT DOCUMENTS REFER TO THESE DRAWINGS,

CONSTRUCTION PERMITS, AND SPECIFICATIONS. NOTES AND

DETAILS ON THE CONTRACT DOCUMENTS SHALL TAKE

PRECEDENCE OVER GENERAL NOTES HEREIN.

2. CHANGES TO THE SPECIFICATIONS AND/OR CONSTRUCTION

SHOWN IN THESE DRAWINGS SHALL NOT BE MADE WITHOUT

APPROVAL FROM THE CITY OR AUTHORIZED REPRESENTATIVE.

3. THE CONTRACTOR SHALL FURNISH ALL MATERIALS,

EQUIPMENT, AND LABOR NECESSARY TO COMPLETE ALL THE

WORK AS INDICATED IN THE CONTRACT DOCUMENTS.

4. THE CONTRACTOR SHALL VISIT THE WORK SITE AND BE

RESPONSIBLE FOR ALL CONTRACT DOCUMENTS, FIELD

CONDITIONS, AND DIMENSIONS AND CONFIRMING THAT

THE WORK MAY BE ACCOMPLISHED AS SHOWN PRIOR TO

PROCEEDING WITH CONSTRUCTION. ANY DISCREPANCIES

ARE TO BE BROUGHT TO THE ATTENTION OF THE CITY OR

AUTHORIZED REPRESENTATIVE PRIOR TO PROCEEDING WITH

THE WORK.

5. THE CONTRACTOR SHALL RECEIVE, IN WRITING,

AUTHORIZATION TO PROCEED BEFORE STARTING THE WORK

ON ANY ITEM NOT CLEARLY DEFINED OR IDENTIFIED BY THE

CONTRACT DOCUMENTS. CONTRACTOR TO PROVIDE NOTICE

TO THE CITY OR AUTHORIZED REPRESENTATIVE PRIOR TO

COMMENCING CONSTRUCTION WORK. DREDGING SHALL

NOT START UNTIL THE CITY OR AUTHORIZED REPRESENTATIVE

APPROVES THE START DATE.

6. THE CONTRACTOR SHALL INSTALL ALL EQUIPMENT AND

MATERIALS IN ACCORDANCE WITH THE MANUFACTURER'S

RECOMMENDATIONS UNLESS SPECIFICALLY INDICATED

OTHERWISE BY THE CITY OR AUTHORIZED REPRESENTATIVE

OR WHERE LOCAL CODES OR REGULATIONS TAKE

PRECEDENCE.

7. ALL THE WORK PERFORMED AND MATERIALS INSTALLED

SHALL BE IN STRICT ACCORDANCE WITH ALL APPLICABLE

CODES, REGULATIONS, AND ORDINANCES.

8. THE CONTRACTOR SHALL ASSUME SOLE AND COMPLETE

RESPONSIBILITY FOR THE WORK SITE CONDITIONS DURING

THE COURSE OF CONSTRUCTION OF THIS PROJECT

INCLUDING SAFETY OF ALL PERSONS AND PROPERTY. THIS

REQUIREMENT SHALL APPLY CONTINUOUSLY AND NOT BE

LIMITED TO NORMAL WORKING HOURS.

9. THE CONTRACT DOCUMENTS REPRESENT THE FINISHED SITE

CONDITIONS. THEY DO NOT INDICATE THE METHOD OF

CONSTRUCTION. THE CONTRACTOR SHALL BE SOLELY

RESPONSIBLE FOR ALL CONSTRUCTION MEANS, METHODS,

TECHNIQUES, SEQUENCES, AND PROCEDURES AND FOR

COORDINATING ALL PORTIONS OF THE WORK UNDER THE

CONTRACT.

10. THE CONTRACTOR SHALL KEEP THE WORK SITE CLEAN AND

HAZARD-FREE. THE CONTRACTOR SHALL PROVIDE ALL

MEASURES NECESSARY TO PROTECT SITE CONDITIONS,

EXISTING STRUCTURES, UTILITIES, WORKERS, AND THE PUBLIC

DURING CONSTRUCTION. ANY DAMAGE TO ITEMS SHALL BE

REPAIRED BY THE CONTRACTOR AT THE CONTRACTOR'S

EXPENSE.

11. UNLESS NOTED OTHERWISE, ALL DEMOLISHED STRUCTURES

MATERIAL AND DEBRIS SHALL BECOME THE PROPERTY OF THE

CONTRACTOR AND SHALL BE DISPOSED OF AT AN APPROVED

DISPOSAL FACILITY OR RECYCLING FACILITY IN ACCORDANCE

WITH APPLICABLE FEDERAL AND STATE LAWS AND

REGULATIONS GOVERNING DISPOSAL.THE CONTRACTOR

SHALL DISPOSE OF ALL DIRT, DEBRIS, AND RUBBISH FOR

DURATION OF THE WORK. UPON COMPLETION OF THE WORK,

THE CONTRACTOR SHALL REMOVE ALL MATERIAL AND

EQUIPMENT NOT SPECIFIED AS REMAINING ON THE

PROPERTY.

12. TRAFFIC CONTROL SHALL BE THE RESPONSIBILITY OF THE

CONTRACTOR THROUGHOUT THE DURATION OF THE

PROJECT AND SUBJECT TO ALL LOCAL, STATE, AND/OR

FEDERAL REGULATIONS.

13. ALL THE WORK SHALL SATISFY CONDITIONS AND

REQUIREMENTS OF FEDERAL, STATE, AND LOCAL PERMITS, AS

APPLICABLE. IN CASES WHERE CONDITIONS AND/OR

REQUIREMENTS VARY FROM PERMIT TO PERMIT, THE MOST

STRINGENT CONDITION AND/OR REQUIREMENT SHALL BE

EMPLOYED.

14. IN-WATER WORK IS SUBJECT TO AN ENVIRONMENTAL

CLOSURE WINDOW. THE WORK DATES ARE PROVIDED IN THE

PROJECT PERMITS.

INFORMATION DISPLAYED, INCLUDING PROPERTY

BOUNDARIES, IS BASED ON AVAILABLE RECORDS

PROVIDED BY THE CITY OF LONG BEACH. THE

CONTRACTOR IS TO VERIFY ALL SITE INFORMATION PRIOR

TO CONSTRUCTION. ANY DISCREPANCIES SHALL BE

REPORTED TO THE CITY OR AUTHORIZED REPRESENTATIVE

PRIOR TO COMMENCING THE WORK.

THE CONTRACTOR SHALL NOTIFY ALL UTILITY COMPANIES

PRIOR TO COMMENCING THE WORK IN ACCORDANCE

WITH STATE AND LOCAL REQUIREMENTS. THE

CONTRACTOR SHALL BE RESPONSIBLE FOR VERIFICATION

OF THE SIZE AND LOCATION OF ALL EXISTING ABOVE AND

UNDERGROUND UTILITIES. EXISTING UTILITIES SHOWN

HAVE BEEN OBTAINED FROM AVAILABLE RECORDS. THE

CONTRACTOR SHALL BE RESPONSIBLE FOR ANY

ADDITIONAL UTILITY LOCATIONS NOT SHOWN. CARE

SHOULD BE TAKEN TO AVOID DAMAGE OR DISTURBANCE

TO EXISTING UTILITIES. THE CONTRACTOR SHALL BE

RESPONSIBLE FOR REPAIRING ANY DAMAGE CAUSED BY

THE CONTRACTOR'S ACTIVITIES.

NO IN-WATER STOCKPILING OF DEBRIS IS ALLOWED.

BATHYMETRIC SURVEY DATA COLLECTED BY ETRAC (A

WOOLPERT COMPANY), DATED JULY 12, 2023.

BATHYMETRY AT TIME OF DREDGING MAY DIFFER.

HORIZONTAL CONTROL: ETRAC BASE, 33°44'57.40631"

N, 118°6'56.37614" W

VERTICAL CONTROL: ETRAC BASE, ELEVATION -105.243

U.S. FT (ELLIPSOIDAL)

NAVD88 TO MLLW DATUM CONVERSION BASED ON

NOSS/NOS VDATUM IN THE SURVEY AREA. NAVD88 TO

MLLW IS -0.2 U.S. FT.

15.

16.

17.

18.

michael.lau

-27

-26 -25

-2 4 -2 3 -2

-2

-1

-1 7 -16 -15

-1

-1 4 -13

-1 2 -11

-1 0 -9 -8

-7

-6 -5

-4 -3

-2 -1

-25 -24

-23

-22

-21

-20 -19-18

-17

-1

-16

-15

-15 -15 -14

-14

-13

-13 -13-12 -12

-12-11

-11-11 -10-10

-10

-9 -9 -8

-8 -7-7 -6-6 -5-5 -4-4 -9 -8 -7 -6 -4 -5

-5 -10-12-13

-14 -15

-11-12 -13

-14

-4-5-6-7 -8-9

-10-1

-1

-2

-20

-15-10

-15

-1

-2 0-18

-17

-21 -20

-19

-1

-15

-18

-19 -21

-20

-21-5 -10

-15

-1 7-1

-15 -14 -13 -14 -13

-17-1 6-17

-1-2-3-4-5

-15 -20

-12

-14 -16

-2

-15

-20

-1

-10-12

-1

-2

-28 -27

-2

-25

-2

-23 -2 2 -21

-20

-19 -1

-1

-13

-1

-12

-1

-11

-1

-9 -8

-7 -6

-5

-5 -5

-4 -4

-4

-3

-3 -2

-1

-28

-27

-27-27

-26

-25

EXISTING

JETTIES

PACIFIC

OCEAN

SEAL BEACH,

CALIFORNIA

TE ALAMITOS

BAY

FUEL DOCK

BASIN 1

BASIN 5

STAGING

AREA

-1

-5 0

-7

-8

-9

-5

HARBOR MASTER DOCK

BERTH 1

BERTH 2

NORTH

LONG DOCK

SOUTH

LONG DOCK

BASIN 2

ENTRANCE CHANNEL

DREDGE BOUNDARY

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

NORTH

SCALE IN FEET

300 600

LEGEND:

DREDGE BOUNDARY

EXISTING CONTOUR (5')

EXISTING CONTOUR (1')

EXISTING EELGRASS

G02

EXISTING CONDITIONS 3

NOTES:

1. HORIZONTAL DATUM: CALIFORNIA STATE PLANE

ZONE 5, NAD83, U.S. SURVEY FEET

2. VERTICAL DATUM: FEET MLLW, NTDE 1983-2001.

3. BATHYMETRIC SURVEY DATA COLLECTED BY

ETRAC (A WOOLPERT COMPANY), DATED JULY

12, 2023. BATHYMETRY AT TIME OF DREDGING

MAY DIFFER.

4. EELGRASS SURVEY BY MTS IN MARCH 2024.

AVOID DISTURBING EELGRASS AREAS. NO

DREDGING, ANCHORING, OR SPUDDING IS

ALLOWED WITHIN EELGRASS AREAS.

5. CONTRACTOR SHALL DREDGE MATERIAL FROM

EC-DU1 FIRST IN SEQUENCE. MATERIAL FROM

EC-DU1 SHALL BE PLACED AT THE BEACH

NOURISHMENT AREA NEAREST THE NORTH

JETTY AND SHALL BE BURIED AS OTHER

MATERIAL FROM WITHIN THE DREDGE

FOOTPRINT IS PLACED AT THE BEACH

NOURISHMENT AREA.

6. TEMPORARY AND OVERNIGHT MOORING IS

ALLOWED WITH OWNER APPROVAL ON SOUTH

LONG DOCK, NORTH LONG DOCK, BERTH 1,

BERTH 2 AND/OR HARBOR MASTER DOCK.

BERTHS 1 AND 2 HAVE CLOSED GANGPLANKS

MAKING LANDSIDE ACCESS NOT POSSIBLE.

EC-DU1

SEE NOTE 5

michael.lau

DC04CC03 FC04

BC03

AC03 EC04

-1

N:1728000

N:1727000

DREDGE TO -18 FT MLLW

PAYABLE OVERDREDGE TO -19 FT MLLW

BID ADDITIVE 2' PAYABLE OVERDREDGE

TO -21 FT MLLW

PACIFIC

OCEAN

-19-19-19

-18 -17

-1

-16

-15

-15 -14

-14

-13

-13-12

-12

-12 -11

-11

-10 -10

-10

-9

-9 -8

-8 -7 -7 -6

-6 -5 -5 -4-4

-9 -8

-7 -6 -4

-5

-5 -10 -12 -13

-14 -15

-11 -12

-13

-14

-6

-7

-8 -9

-10

-1

-5

-1

-2

-15

-20

-1

-10-12

-1

PAYABLE SIDE SLOPE IS 2H:1V

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

NORTH

SCALE IN FEET

100 200

LEGEND:

DREDGE FOOTPRINT

DREDGE DAYLIGHT (TOP OF SLOPE)

DREDGE FOOTPRINT (TOE OF DREDGE SLOPE)

EXISTING CONTOUR (5')

EXISTING CONTOUR (1')

CONTROL POINT

C01

DREDGE PLAN VIEW (1) 4

NOTES:

1. HORIZONTAL DATUM: CALIFORNIA STATE PLANE

ZONE 5, NAD83, U.S. SURVEY FEET

2. VERTICAL DATUM: FEET MLLW, NTDE 1983-2001.

3. BATHYMETRIC SURVEY DATA COLLECTED BY

ETRAC (A WOOLPERT COMPANY), DATED JULY

12, 2023. BATHYMETRY AT TIME OF DREDGING

MAY DIFFER.

4. CONTRACTOR SHALL DREDGE MATERIAL FROM

EC-DU1 FIRST IN SEQUENCE. MATERIAL FROM

EC-DU1 SHALL BE PLACED AT THE BEACH

NOURISHMENT AREA NEAREST THE NORTH

JETTY AND SHALL BE BURIED AS OTHER

MATERIAL FROM WITHIN THE DREDGE

FOOTPRINT IS PLACED AT THE BEACH

NOURISHMENT AREA.

-5

-1

EC-DU1

SEE NOTE 4

michael.lau

JC06

HC05

IC06

GC05

N:1730000

N:1731000

PACIFIC

OCEAN

Alamitos Bay

Basin 5

Basin 1

-1 0 -9

-8

-7 7

-1

-16

-15

-15 -14-13-12-11

-4-5-6

-7

-5

-2

-20

-15

-10

-15

-1

-2

-18

-17

-21

-20

-19

-1

-15

-18

-19 -21

-20

-21-5

-10

-15

-1

-15 -14

-13 -14

-13

-17

-1 6-17

-1 -2-3-4

-15 -20

-12

-14

-16

PAYABLE SIDE SLOPE IS 2H:1V

DREDGE TO -18 FT MLLW

PAYABLE OVERDREDGE TO -19 FT MLLW

BID ADDITIVE 2' PAYABLE OVERDREDGE

TO -21 FT MLLW

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

NORTH

SCALE IN FEET

100 200

C02

DREDGE PLAN VIEW (2) 5

NOTES:

1. HORIZONTAL DATUM: CALIFORNIA STATE PLANE

ZONE 5, NAD83, U.S. SURVEY FEET

2. VERTICAL DATUM: FEET MLLW, NTDE 1983-2001.

3. BATHYMETRIC SURVEY DATA COLLECTED BY ETRAC

(A WOOLPERT COMPANY), DATED JULY 12, 2023.

BATHYMETRY AT TIME OF DREDGING MAY DIFFER.

4. EELGRASS SURVEY BY MTS IN MARCH 2024.

AVOID DISTURBING EELGRASS AREAS. NO

DREDGING, ANCHORING, OR SPUDDING IS

ALLOWED WITHIN EELGRASS AREAS.

LEGEND:

DREDGE FOOTPRINT

DREDGE DAYLIGHT (TOP OF SLOPE)

DREDGE FOOTPRINT (TOE OF DREDGE SLOPE)

EXISTING CONTOUR (5')

EXISTING CONTOUR (1')

EXISTING EELGRASS

CONTROL POINT

-10

-8

SOUTH LONG DOCK

NORTH LONG DOCK

CLOSED (NOT TO BE USED)

BERTH 2

BERTH 1

michael.lau

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350

A A'

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350

B B'

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350

C C'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONA

C01 1" = 20'

1" = 10'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONB

C01 1" = 20'

1" = 10'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONC

C01 1" = 20'

1" = 10'

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

1V 2H1V

1V 2H

EXISTING MUDLINE

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

ALLOWABLE OVERDREDGE (-22' MLLW)

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

C03

DREDGE CROSS SECTIONS (1) 6

LEGEND:

REQUIRED DREDGE ELEVATION (-18' MLLW)

1' PAID OVERDREDGE (-19' MLLW)

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

EXISTING MUDLINE

REQUIRED DREDGING TO -18' MLLW

NOTES:

1. DREDGED MATERIAL EXCLUDING DEBRIS SHALL

BE PLACED AT THE IDENTIFIED BEACH

NOURISHMENT AREA.

2. CONTRACTOR SHALL DREDGE THE SIDE SLOPES

IDENTIFIED IN THE DRAWING. THE SIDE SLOPE

VOLUME ASSOCIATED WITH THE MAXIMUM PAY

LIMIT IS INCLUDED IN THE DREDGING BID ITEM

QUANTITIES.

3. DREDGING OF SEDIMENT OUTSIDE THE

DREDGING LIMITS AND/OR BELOW THE

NON-PAY OVERDREDGE ELEVATION IS DEFINED

AS EXCESSIVE DREDGING AND IS PROHIBITED.

CONTRACTOR WILL NOT BE PAID FOR EXCESSIVE

DREDGING AND WILL BE RESPONSIBLE FOR ANY

REGULATORY AGENCY FEES AND/OR FINES

INCURRED AS A RESULT OF EXCESSIVE

DREDGING. ADDITIONALLY, IF EXCESSIVE

DREDGING RESULTS IN DAMAGE OR

UNDERMINING TO EXISTING STRUCTURES, THE

CONTRACTOR SHALL RECTIFY TO THE CITY OR

AUTHORIZED REPRESENTATIVE'S SATISFACTION

PRIOR TO CLOSE OF THE CONTRACT.

4. THE REQUIRED DREDGE ELEVATION MUST BE

ACHIEVED IN ALL AREAS FOR IT TO BE

ACCEPTED AS COMPLETE. CONTRACTOR MUST

REMOVE ALL SLOUGH MATERIAL FROM THE

REQUIRED DREDGE AREA IN ORDER FOR WORK

TO BE ACCEPTED BY THE CITY OR AUTHORIZED

REPRESENTATIVE. THE CITY OR AUTHORIZED

REPRESENTATIVE WILL COMPARE THE PRE- AND

POST-DREDGE SURVEYS TO ENSURE THAT

DREDGED SEDIMENT FROM ALL OF THE DREDGE

AREA IS REMOVED FROM THE SITE.

5. CONTRACTOR MUST REMOVE ALL DEBRIS TO

CONDUCT THE DREDGING WORK. THE

CONTRACTOR SHALL TAKE CARE TO AVOID

CONTACT WITH THE NEARBY BANK DURING

DEBRIS REMOVAL ACTIVITIES.

6. ANY DEBRIS ENCOUNTERED AND REMOVED

DURING THE WORK SHALL BE REMOVED BY THE

CONTRACTOR AND PROPERLY DISPOSED OF AT

A CONTRACTOR-SELECTED AND

OWNER-APPROVED OFF-SITE UPLAND

COMMERCIAL LANDFILL LOCATION IN

ACCORDANCE WITH FEDERAL, STATE, AND

LOCAL LAWS AND REGULATIONS. NO DEBRIS IS

ALLOWED TO BE PLACED WITHIN THE BEACH

NOURISHMENT AREA AND MUST BE

SEGREGATED FROM THE SANDS.

michael.lau

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370

D D'

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350

E E'

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350

F F'

1V 2H

EXISTING MUDLINE

1V 2H

EXISTING MUDLINE

1V 2H

EXISTING MUDLINE

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIOND

C01 1" = 20'

1" = 10'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONE

C01 1" = 20'

1" = 10'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONF

C01 1" = 20'

1" = 10'

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

ALLOWABLE OVERDREDGE (-22' MLLW)

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

C04

DREDGE CROSS SECTIONS (2) 7

NOTES:

1. DREDGED MATERIAL EXCLUDING DEBRIS SHALL

BE PLACED AT THE IDENTIFIED BEACH

NOURISHMENT AREA.

2. CONTRACTOR SHALL DREDGE THE SIDE SLOPES

IDENTIFIED IN THE DRAWING. THE SIDE SLOPE

VOLUME ASSOCIATED WITH THE MAXIMUM PAY

LIMIT IS INCLUDED IN THE DREDGING BID ITEM

QUANTITIES.

3. DREDGING OF SEDIMENT OUTSIDE THE

DREDGING LIMITS AND/OR BELOW THE

NON-PAY OVERDREDGE ELEVATION IS DEFINED

AS EXCESSIVE DREDGING AND IS PROHIBITED.

CONTRACTOR WILL NOT BE PAID FOR EXCESSIVE

DREDGING AND WILL BE RESPONSIBLE FOR ANY

REGULATORY AGENCY FEES AND/OR FINES

INCURRED AS A RESULT OF EXCESSIVE

DREDGING. ADDITIONALLY, IF EXCESSIVE

DREDGING RESULTS IN DAMAGE OR

UNDERMINING TO EXISTING STRUCTURES, THE

CONTRACTOR SHALL RECTIFY TO THE CITY OR

AUTHORIZED REPRESENTATIVE'S SATISFACTION

PRIOR TO CLOSE OF THE CONTRACT.

4. THE REQUIRED DREDGE ELEVATION MUST BE

ACHIEVED IN ALL AREAS FOR IT TO BE

ACCEPTED AS COMPLETE. CONTRACTOR MUST

REMOVE ALL SLOUGH MATERIAL FROM THE

REQUIRED DREDGE AREA IN ORDER FOR WORK

TO BE ACCEPTED BY THE CITY OR AUTHORIZED

REPRESENTATIVE. THE CITY OR AUTHORIZED

REPRESENTATIVE WILL COMPARE THE PRE- AND

POST-DREDGE SURVEYS TO ENSURE THAT

DREDGED SEDIMENT FROM ALL OF THE DREDGE

AREA IS REMOVED FROM THE SITE.

5. CONTRACTOR MUST REMOVE ALL DEBRIS TO

CONDUCT THE DREDGING WORK. THE

CONTRACTOR SHALL TAKE CARE TO AVOID

CONTACT WITH THE NEARBY BANK DURING

DEBRIS REMOVAL ACTIVITIES.

6. ANY DEBRIS ENCOUNTERED AND REMOVED

DURING THE WORK SHALL BE REMOVED BY THE

CONTRACTOR AND PROPERLY DISPOSED OF AT

A CONTRACTOR-SELECTED AND

OWNER-APPROVED OFF-SITE UPLAND

COMMERCIAL LANDFILL LOCATION IN

ACCORDANCE WITH FEDERAL, STATE, AND

LOCAL LAWS AND REGULATIONS. NO DEBRIS IS

ALLOWED TO BE PLACED WITHIN THE BEACH

NOURISHMENT AREA AND MUST BE

SEGREGATED FROM THE SANDS.

LEGEND:

REQUIRED DREDGE ELEVATION (-18' MLLW)

1' PAID OVERDREDGE (-19' MLLW)

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

EXISTING MUDLINE

REQUIRED DREDGING TO -18' MLLW

michael.lau

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350

G G'

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-20-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360

H H'

1V 2H

EXISTING MUDLINE

1V 2H

EXISTING MUDLINE

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONG

C02 1" = 20'

1" = 10'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONH

C02 1" = 20'

1" = 10'

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

ALLOWABLE OVERDREDGE (-22' MLLW)

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

C05

DREDGE CROSS SECTIONS (3) 8

NOTES:

1. DREDGED MATERIAL EXCLUDING DEBRIS SHALL

BE PLACED AT THE IDENTIFIED BEACH

NOURISHMENT AREA.

2. CONTRACTOR SHALL DREDGE THE SIDE SLOPES

IDENTIFIED IN THE DRAWING. THE SIDE SLOPE

VOLUME ASSOCIATED WITH THE MAXIMUM PAY

LIMIT IS INCLUDED IN THE DREDGING BID ITEM

QUANTITIES.

3. DREDGING OF SEDIMENT OUTSIDE THE

DREDGING LIMITS AND/OR BELOW THE

NON-PAY OVERDREDGE ELEVATION IS DEFINED

AS EXCESSIVE DREDGING AND IS PROHIBITED.

CONTRACTOR WILL NOT BE PAID FOR EXCESSIVE

DREDGING AND WILL BE RESPONSIBLE FOR ANY

REGULATORY AGENCY FEES AND/OR FINES

INCURRED AS A RESULT OF EXCESSIVE

DREDGING. ADDITIONALLY, IF EXCESSIVE

DREDGING RESULTS IN DAMAGE OR

UNDERMINING TO EXISTING STRUCTURES, THE

CONTRACTOR SHALL RECTIFY TO THE CITY OR

AUTHORIZED REPRESENTATIVE'S SATISFACTION

PRIOR TO CLOSE OF THE CONTRACT.

4. THE REQUIRED DREDGE ELEVATION MUST BE

ACHIEVED IN ALL AREAS FOR IT TO BE

ACCEPTED AS COMPLETE. CONTRACTOR MUST

REMOVE ALL SLOUGH MATERIAL FROM THE

REQUIRED DREDGE AREA IN ORDER FOR WORK

TO BE ACCEPTED BY THE CITY OR AUTHORIZED

REPRESENTATIVE. THE CITY OR AUTHORIZED

REPRESENTATIVE WILL COMPARE THE PRE- AND

POST-DREDGE SURVEYS TO ENSURE THAT

DREDGED SEDIMENT FROM ALL OF THE DREDGE

AREA IS REMOVED FROM THE SITE.

5. CONTRACTOR MUST REMOVE ALL DEBRIS TO

CONDUCT THE DREDGING WORK. THE

CONTRACTOR SHALL TAKE CARE TO AVOID

CONTACT WITH THE NEARBY BANK DURING

DEBRIS REMOVAL ACTIVITIES.

6. ANY DEBRIS ENCOUNTERED AND REMOVED

DURING THE WORK SHALL BE REMOVED BY THE

CONTRACTOR AND PROPERLY DISPOSED OF AT

A CONTRACTOR-SELECTED AND

OWNER-APPROVED OFF-SITE UPLAND

COMMERCIAL LANDFILL LOCATION IN

ACCORDANCE WITH FEDERAL, STATE, AND

LOCAL LAWS AND REGULATIONS. NO DEBRIS IS

ALLOWED TO BE PLACED WITHIN THE BEACH

NOURISHMENT AREA AND MUST BE

SEGREGATED FROM THE SANDS.

LEGEND:

REQUIRED DREDGE ELEVATION (-18' MLLW)

1' PAID OVERDREDGE (-19' MLLW)

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

EXISTING MUDLINE

REQUIRED DREDGING TO -18' MLLW

michael.lau

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450

I I'

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-25

-20

-15

-10

-5

-25

-20

-15

-10

-5

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340

J J'

1V 2H

EXISTING MUDLINE

1V 2H

EXISTING MUDLINE

1V 2H

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONI

C02 1" = 20'

1" = 10'

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONJ

C02 1" = 20'

1" = 10'

EXISTING FLOATING DOCKS

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

REQUIRED DREDGE ELEVATION (-18')

1' PAID OVERDREDGE (-19')

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

ALLOWABLE OVERDREDGE (-22' MLLW)

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

C06

DREDGE CROSS SECTIONS (4) 9

NOTES:

1. DREDGED MATERIAL EXCLUDING DEBRIS

SHALL BE PLACED AT THE IDENTIFIED

BEACH NOURISHMENT AREA.

2. CONTRACTOR SHALL DREDGE THE SIDE

SLOPES IDENTIFIED IN THE DRAWING.

THE SIDE SLOPE VOLUME ASSOCIATED

WITH THE MAXIMUM PAY LIMIT IS

INCLUDED IN THE DREDGING BID ITEM

QUANTITIES.

3. DREDGING OF SEDIMENT OUTSIDE THE

DREDGING LIMITS AND/OR BELOW THE

NON-PAY OVERDREDGE ELEVATION IS

DEFINED AS EXCESSIVE DREDGING AND

IS PROHIBITED. CONTRACTOR WILL NOT

BE PAID FOR EXCESSIVE DREDGING AND

WILL BE RESPONSIBLE FOR ANY

REGULATORY AGENCY FEES AND/OR

FINES INCURRED AS A RESULT OF

EXCESSIVE DREDGING. ADDITIONALLY, IF

EXCESSIVE DREDGING RESULTS IN

DAMAGE OR UNDERMINING TO

EXISTING STRUCTURES, THE

CONTRACTOR SHALL RECTIFY TO THE

CITY OR AUTHORIZED

REPRESENTATIVE'S SATISFACTION PRIOR

TO CLOSE OF THE CONTRACT.

4. THE REQUIRED DREDGE ELEVATION

MUST BE ACHIEVED IN ALL AREAS FOR IT

TO BE ACCEPTED AS COMPLETE.

CONTRACTOR MUST REMOVE ALL

SLOUGH MATERIAL FROM THE

REQUIRED DREDGE AREA IN ORDER FOR

WORK TO BE ACCEPTED BY THE CITY OR

AUTHORIZED REPRESENTATIVE. THE CITY

OR AUTHORIZED REPRESENTATIVE WILL

COMPARE THE PRE- AND POST-DREDGE

SURVEYS TO ENSURE THAT DREDGED

SEDIMENT FROM ALL OF THE DREDGE

AREA IS REMOVED FROM THE SITE.

5. CONTRACTOR MUST REMOVE ALL

DEBRIS TO CONDUCT THE DREDGING

WORK. THE CONTRACTOR SHALL TAKE

CARE TO AVOID CONTACT WITH THE

NEARBY BANK DURING DEBRIS

REMOVAL ACTIVITIES.

6. ANY DEBRIS ENCOUNTERED AND

REMOVED DURING THE WORK SHALL BE

REMOVED BY THE CONTRACTOR AND

PROPERLY DISPOSED OF AT A

CONTRACTOR-SELECTED AND

OWNER-APPROVED OFF-SITE UPLAND

COMMERCIAL LANDFILL LOCATION IN

ACCORDANCE WITH FEDERAL, STATE,

AND LOCAL LAWS AND REGULATIONS.

NO DEBRIS IS ALLOWED TO BE PLACED

WITHIN THE BEACH NOURISHMENT

AREA AND MUST BE SEGREGATED FROM

THE SANDS.

7. CONTRACTOR IS RESPONSIBLE FOR

CLEANING MATERIAL FROM ANY

SURFACES, DOCKS, OR PROPERTY AS

SOON AS POSSIBLE OR BY THE END OF

EACH WORK DAY.

LEGEND:

REQUIRED DREDGE ELEVATION (-18' MLLW)

1' PAID OVERDREDGE (-19' MLLW)

BID ADDITIVE 2' PAID OVERDREDGE (-21' MLLW)

ALLOWABLE OVERDREDGE (-22' MLLW)

EXISTING MUDLINE

REQUIRED DREDGING TO -18' MLLW

michael.lau

-11

-10

-9

-8

-7 -6

-5 -4

-3-2-10 1 2 3 4 5 6 7 8 9

-16

-15

-1

-14

-1

-13

-1

-12

-1

-10 -9

-8

-4 -5

-6 -7

-8 -9

-25 -20

-1

-10

-15

-18

-17

-15

-18

-1

-21

-20

-21

-5

-10

-1

-17

-16

-1

-13

-1

-16

-17

-1-2

-3 -4

-5

-15 -20

-1

-14 -16

-14

-13

-12

-11

-10

-9 -8

-7

5 6 7 8 9 10

EXISTING

JETTIES

SEAL BEACH, CALIFORNIA

ALAMITOS

BAY

ENTRANCE

CHANNEL DREDGING

(SEE SHEETS C01 & C02)

BASIN 5

-10

-5

K C0

PROPOSED STAGING AREA

11 12

HORIZONTAL DISTANCE IN FEET

2X VERTICAL EXAGGERATION

-30

-20

-10

-30

-20

-10

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700

K K'

+10' MLLW TOP ELEVATION TARGET

WITH +/- 2' VERTICAL TOLERANCE

OVER BEACH NOURISHMENT AREA.

HORIZONTAL SCALE:

VERTICAL SCALE:

SECTIONK

C07 1" = 40'

1" = 20'

EXISTING GROUND

TARGET SIDE SLOPE TO RANGE BETWEEN

20H:1V MINIMUM TO 20H:3V MAXIMUM

IN BEACH NOURISHMENT AREA.

MHHW 5.5'

BEACH TO BE NOURISHED WITH DREDGED

MATERIAL UP TO THE TOTAL ALLOWABLE VOLUME

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

NORTH

SCALE IN FEET

200 400

LEGEND:

EXISTING CONTOUR (5')

EXISTING CONTOUR (1')

BEACH NOURISHMENT PLACEMENT AREA

HAUL ROUTE FOR OFFSITE DISPOSAL OF DEBRIS

C07

BEACH NOURISHMENT AREA 10

NOTES:

1. HORIZONTAL DATUM: CALIFORNIA STATE PLANE

ZONE 5, NAD83, U.S. SURVEY FEET

2. VERTICAL DATUM: FEET MLLW, NTDE 1983-2001.

3. BATHYMETRIC SURVEY DATA COLLECTED BY

ETRAC (A WOOLPERT COMPANY), DATED JULY

12, 2023. BATHYMETRY AT TIME OF DREDGING

MAY DIFFER.

4. CONTRACTOR RESPONSIBLE FOR INSTALLING,

MAINTAINING, AND REMOVING PUBLIC SAFETY

MEASURES AROUND BEACH PLACEMENT AND

STAGING AREAS. SAFETY MEASURES SHALL

INCLUDE, BUT NOT BE LIMITED TO, SIGNAGE,

BARRICADES, FENCING WITH GATES, SPOTTERS,

AND CORDONED OFF ACTIVE WORK AREAS. SEE

SPECIFICATIONS FOR PUBLIC SAFETY

REQUIREMENTS.

5. CONTRACTOR SHALL PLACE DREDGED MATERIAL

IN BEACH NOURISHMENT AREA USING

HYDRAULIC PLACEMENT METHODS FROM

EITHER HYDRAULIC DREDGING DISCHARGE

PIPELINE, OR HYDRAULIC DISCHARGE FROM A

HAUL BARGE IF MECHANICAL DREDGING IS

USED.

6. CONTRACTOR TO CONFIRM EXTENTS AND

LOCATION OF STAGING AREA WITH CITY.

7. CONTRACTOR TO OBTAIN OWNER APPROVAL

PRIOR TO TEMPORARILY STOCKPILING DEBRIS

AT THE SITE.

SCALE IN FEET

200 400

BEACH TO BE NOURISHED WITH DREDGED

MATERIAL UP TO THE TOTAL ALLOWABLE VOLUME.

michael.lau

-26

-24

-22

-20

-18

-16

-14 -14

-14

-12

-10

-8

-6

-4

-2

-2 4 -2 2 -2

-1

-16

-1

-16

-1

-14 -1

-1

-1 2 -1

-1

-1 0 -8

-8

-6

-4 -4

-8

-6 -4

-1 0 -1

-1

-4

-6

-8

-1

-12

-20

-10

-20-18

-20 -18

-18

-20

-1

-16

-14

-16

-2

-4

-20

-12

-14 -16

-20

-10 -12

-14

-22

-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

EXISTING

JETTIES

SEAL BEACH, CALIFORNIA

PACIFIC

OCEAN

ALAMITOS

BAY

ENTRANCE

CHANNEL DREDGING

(SEE SHEETS C01 & C02)

BASIN 5

BEACH

NOURISHMENT

AREA

0-2-4

-6

BASIN 2

BASIN 1

-1

-16

-14

0-2 -4

-6

D. MASSARO

M. PRATSCHNER

M. COLLINS

T. WANG

AS NOTED

JUNE 2025

DRAFT - ISSUED FOR BID

DESCRIPTIONAPP'DDATE BY

REVISIONS

REV

O N

APPROVED BY:

CHECKED BY:

DRAWN BY:

DATE:

SCALE:

ALAMITOS BAY ENTRANCE CHANNEL

MAINTENANCE DREDGING AND BEACH

NOURISHMENT

SHEET # OF

N D

O B

R, A

, I F

N O

T O

N E

NORTH

SCALE IN FEET

300 600

LEGEND:

EXISTING CONTOUR (5')

EXISTING CONTOUR (1')

BEACH NOURISHMENT PLACEMENT AREA

CONCEPTUAL PIPELINE ROUTE OVER JETTY IF

FEASIBLE AND APPROVED (SEE NOTE 6)

EXISTING EELGRASS

C08

POTENTIAL HYDRAULIC DREDGE

PIPELINE ROUTE 11

NOTES:

1. HORIZONTAL DATUM: CALIFORNIA STATE PLANE

ZONE 5, NAD83, U.S. SURVEY FEET

2. VERTICAL DATUM: FEET MLLW, NTDE 1983-2001.

3. BATHYMETRIC SURVEY DATA COLLECTED BY ETRAC

(A WOOLPERT COMPANY), DATED JULY 12, 2023.

BATHYMETRY AT TIME OF DREDGING MAY DIFFER.

4. THE HYDRAULIC PIPELINE, IF USED TO PERFORM THE

DREDGING, SHALL BE PRIMARILY LOCATED OUTSIDE

OF THE ENTRANCE CHANNEL LIMITS EXCEPT FOR

THE PORTION OF THE PIPELINE ATTACHED TO THE

HYDRAULIC DREDGE OPERATING WITHIN THE

ENTRANCE CHANNEL BOUNDARIES. ALL FLOATING

PIPELINES SHALL BE MARKED WITH LIGHTS MEETING

USCG REGULATIONS. CONTRACTOR SHALL FULLY

SUBMERGE THE HYDRAULIC PIPELINE PORTIONS

LOCATED WITHIN THE NAVIGATION CHANNEL FOR

SAFE VESSEL PASSAGE. SUBMERGED PIPELINES

SHALL BE MARKED WITH BUOYS ALONG ITS

LENGTH. PIPELINES SHALL NOT DISTURB EELGRASS

AREAS.

5. EELGRASS SURVEY BY MTS IN MARCH 2024. AVOID

DISTURBING EELGRASS AREAS. NO DREDGING,

ANCHORING, SPUDDING, OR PIPELINE ROUTING IS

ALLOWED WITHIN EELGRASS AREAS.

6. CONTRACTOR SHALL PROPOSE A PIPELINE ROUTE

TO SAFELY CROSS OVER THE WESTERN JETTY.

PUBLIC SAFETY MUST BE MAINTAINED

THROUGHOUT THE WORK. PIPELINE MUST BE

PLACED WATERWARD OF THE 72ND PI LIFEGUARD

STATION, ALLOWING FOR CONTINUOUS VEHICLE

ACCESS TO 72ND STATION FROM THE ROAD.

STAGING

AREA

NORTH

SCALE IN FEET

100 200

72ND PI

LIFEGUARD

STATION

EC-DU1

michael.lau

Sheets and Views

1 0548 PL TITLE - T01

2 0548 PL TITLE - G01

3 0548 PL EXISTING - G02

4 0548 PL DREDGE - C01

5 0548 PL DREDGE - C02

6 0548 PL XSEC - C03

7 0548 PL XSEC - C04

8 0548 PL XSEC - C05

9 0548 PL XSEC - C06

10 0548 PL BEACH NOURISHMENT - C07

11 0548 PL PIPELINE - C08

File details come from the government source that posted it. Updated Jun 3, 2026.