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NUM.
REVISION
\Rgcommended for Approval
- 9) DOWN TO CONCRETE
BOTTOM OF FOREBAY (10) _ _ _ _ _ _ _
( 0), - - - - - _ - - �� 23 SEPTEMBER THIS WATER LEVEL IS TYPICALLY MAINTAINED BY OPERATING PUMP P-1 (75
1� CFS). INSTALL RIVER BYPASS PIPE AND PUMP SYSTEM PRIOR TO COMPLETING
(11.56) ��� (11.56) __J� _ --,(11 56) INSTALLATION OF TEMPORARY COFFERDAM. MAINTAIN PUMP BYPASS UPSTREAM INTAKE
NEAR WATER SURFACE, AT LEAST 3 FEET ABOVE MUDLINE, AND AVOID GENERATING AND
1 1 .56), - _ �' _ _ ~ `(1 1.56} - - "" - _ 1 1.56� - - I n PUMPING TURBID WATER. USE BYPASS DOWNSTREAM DISCHARGE THAT AVOIDS
( _
i r �- i �,- - /� II --�o GENERATING TURBID WATER. DISCHARGE MUST AT LEAST CONSIST OF DIFFUSER PIPE
_ L I %-�----- MAINTAINED AT WATER SURFACE OR FLOATING ENERGY DISSIPATING SPLASH PAD.
- - - -- ¢ v -= PROVIDE BYPASS SYSTEM BACKUP FOR STORM EVENTS PER SPECIFICATIONS. SEE
I I I I I PUMP ®P a; ? SPECIFICATIONS FOR ADDITIONAL INFORMATION REGARDING BYPASS SYSTEM DESIGN
P-8 P-7 P-6 P-5 P-4 P-3 P-2 I P-1 O > �; ® REQUIREMENTS, OPERATION, AND REQUIRED PUMP PROTECTION MEASURES.
L_______I_______L_______L_�_____L_.j...}. BAYS ® vs 6. INSTALL TEMPORARY COFFERDAM PER SPECIFICATIONS AND MANUFACTURER'S
RECOMMENDATIONS. COFFERDAM MUST RETAIN ANTICIPATED RIVER STAGE DURING
I I CONSTRUCTION WITHOUT EXCESSIVE SEEPAGE, AND BE SUITABLE FOR SOFT MUDLINE
I I SEDIMENT. INCLUDE AT LEAST 30 FOOT WIDE COFFERDAM SPILLWAY AT ELEVATION 7.5
PUMP I FEET. SHEETPILES ARE NOT ALLOWED FOR TEMPORARY COFFERDAM.
SEDIMENT REMOVAL I 7. REMOVE SEDIMENT WITHIN THE WORK LIMITS SHOWN. SEDIMENT REMOVAL ZONE A
ZONE B, N STATION I S / (2,560 CY) INCLUDES SEDIMENT LOCATED EAST OF THE TRASH RACK. SEDIMENT
SEE NOTE 7 ! z ®0 0 / REMOVAL ZONE B (450 CY) INCLUDES SEDIMENT LOCATED WEST OF THE TRASH RACK,
/ BUT EAST OF THE PUMP BAYS. ACCESS TO ZONE B IS LIMITED BY THE TRASH RACK.
29 W ® m m I I CONTRACTOR MAY ELECT TO REMOVE AND RESET TRASH RACKS TO IMPROVE ACCESS TO
I I ZONE B. IF REMOVED, RESET TRASH RACKS USING MEANS AND MATERIALS EQUIVALENT
TO THE ORIGINAL TRASH RACK FASTENING METHODS AND MATERIALS, AS APPROVED BY
i I i PROJECT REPRESENTATIVE.
8. WHEN TRANSPORTING SEDIMENT TO THE UPLAND AREA AVOID SPILLING SEDIMENT AND
PROMPTLY CLEAN UP ANY SEDIMENT THAT IS SPILLED. DO NOT ALLOW SEDIMENT,
/ MATERIAL, OR DEBRIS MOVED UPLAND TO ENTER INTO THE BLACK RIVER. AT A MINIMUM
i SEDIMENT TRANSFER AREA SHOULD BE COVERED WITH A NON -WOVEN GEOTEXTILE TO
I I
0 ' CATCH SPILLED SEDIMENT. SEDIMENT TRANSFER AREA IS WHERE SEDIMENT IS
TRANSFERRED TO CONTAINERS TO TRANSPORT TO DECANT AREA. TRANSPORT SEDIMENT
TO DECANT AREA IN WATER TIGHT CONTAINERS AND AVOID SPILLAGE OF SEDIMENT OR
BI1� CONSTRUCTION NOTES: WATER.
ORARY CRANE PAD AND ACCESS ROAD AS NEEDED FOR SEDIMENT
'WAS j� .� �
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.0 37844
APPROVED:
PROJECT T. BEAN, E. PETERS
M AN AGER:
DESIGNED: J. BINGHAM
CHECKED: G. HORVITZ
DESIGN ENTERED: E. LINDQUIST
BY DATE
1. SEE SHEET G2 FOR SURVEY NOTES
9. CONSTRUCT A TEMP
REMOVAL OPERATIONS. CONTRACTOR MUST DESIGN SHORING SYSTEM, IF REQUIRED,
2. MAINTAIN ACCESS TO AND PROTECT
PUMP STATION AND ASSOCIATED FEATURES DURING ACCORDING TO SPECIFICATIONS. CONTRACTOR IS RESPONSIBLE FOR VERIFYING THAT
SEDIMENT REMOVAL OPERATIONS.
EXISTING WINGWALL HAS SUFFICIENT STRUCTURAL CAPACITY TO SUPPORT ALL EQUIPMENT
3. RELOCATE FLOATING BOOM AS NEEDED FOR SEDIMENT REMOVAL OPERATIONS. RETURN THAT WILL USE THE CRANE PAD PER THE SPECIFICATIONS.
BOOM TO EXISTING LOCATION AT END OF WORK. 10. TRANSPORT AND DISPOSE OF SEDIMENT AT AN APPROVED LANDFILL IN ACCORDANCE
4. INSTALL APPROPRIATE TURBIDITY CONTROL
MEASURES TO LIMIT THE RELEASE OF TURBID WITH SPECIFICATIONS. PRIOR TO DISPOSAL, DEWATER SEDIMENT AS NEEDED IN THE
WATER AND SEDIMENT OUTSIDE OF
THE SEDIMENT REMOVAL AREA TO MEET SPECIFIED UPLAND STOCKPILE AND DECANT AREA SOUTH OF THE PUMP STATION, SEE SHEET C3.
WATER QUALITY REQUIREMENTS FOR
THE PROJECT. AT A MINIMUM, INSTALL ONE OR 11. PLACE A SAND -GRAVEL CAP OVER THE FINAL DREDGE SURFACE IN ZONE A EAST OF
MORE ROWS OF TYPE II TURBIDITY
CURTAIN (SEE DETAIL A, SHEET C3) UPSTREAM OF THE FOREBAY CONCRETE APRON, SEE SHEET C3. THE SAND -GRAVEL CAP MAY BE
THE SEDIMENT REMOVAL AREA, BEFORE
INSTALLING TEMPORARY COFFERDAM, AND EXTEND ELIMINATED, AT THE DIRECTION OF THE PROJECT REPRESENTATIVE, IF THE DREDGED
ALL TURBIDITY CURTAINS THE FULL
DEPTH OF THE WATER COLUMN. SURFACE HAS LOWER CONCENTRATIONS OF THE CHEMICALS OF CONCERN, INDICATED IN
5. MAINTAIN WATER LEVEL UPSTREAM OF THE WORK AREA BETWEEN ELEVATION +6 FEET THE SPECIFICATIONS, THAN THE DREDGED SEDIMENT.
AND +7.5 FEET DURING SEDIMENT
REMOVAL OPERATIONS. BETWEEN JULY AND
SHEET
-
LAI
BLACK RIVER PUMP STATION
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County
King Cou y
KC: 1 120590
SEDIMENT REMOVAL
OF
3 2016
A
Department of Natural Resources and Parks
—
PROJECT No. HC: 1789407
Water and Land Resources Division
9
3 2016
Regional Services Section
3 2016
Christie True, Director
FOREBAY SEDMEW REMOVAL PLAN
SHEETS
3 2016
CONTRACT No. C01043C16
201n-06
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