20180061 Ver 1_230_040_17BP7C12_EC-4A_20180111

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NOTE:
ALL EROSION CONTROL DEVICES SHOWN ARE
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BEGIN PROJECT 176P.7.C.12
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END PROJECT 17BPJ.C.12
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PROJECT REFERENCE NO. I SHEET NO.
RNJ SHEET NO.
CULVERTiPIPE PUMP-AROUND FLOW DIVERSION
& DE-WATERING CONFIGURATION
NOT TO SG4LE
FLOW
IMPERVIOUSDIKE— �
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CULVERT —� \
WORK
AREA
� TEMPORARY \
FLEXIBLE HOSE _
DE-WATERING PUMP —�
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EXISTING
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� RElv1OVE EX. 2 96" CMPs �
— J CONC I EXISTING
INV=567.26'
DIKE 2
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� ELEV. = 580.87� FRE�DIE W &
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'.38� � W/HEADWALL
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IMPERVIOUS \ �S�
DIKE 3
JS�
1. INSTALL TEMPORARY SEDIMENT CONTROL DEVICES: PERIMETER EROSION CONTROL, SAFETY FENCING, AND JURISDICTIONAL FLAGGING.
2. INSTALL SPECIAL STILLING BASIN (DE-WATERING BAG) AND TEMPORARY STABILIZED OUTLET(S) AT THE DOWNSTREAM END OF THE WORKING AREA.
REFER TO STD. DRAWING 1630.06.
3. INSTALL CLEAN WATER PUMP-AROUND PUMP(S) AND TEMPORARY FLEXIBLE HOSE(S).
4. INSTALL UPSTREAM IMPERVIOUS DIKE(5) AND BEGIN PUMPING (CLEAN WATER EFFLUENT) DOWNSTREAM TO TEMPORARY STABILIZED OUTLET.
5. INSTALL DOWNSTREAM IMPERVIOUS DIKE(S), DE-WATERING PUMP(S), AND TEMPORARY FLEXIBLE HOSE(S).
b. DE-WATER THE WORKING AREA, AS NEEDED FOR CONSTRUCTION, INTO THE SPECIAL STILLING BASIN AND TEMPORARY STABILIZED OUTLET.
7. PERFORM REQUIRED EXCAVATION FOR PROPOSED CULVERT(S) INCLUDING REMOVAL OF EXISTING CULVERT(S).
8. CONSTRUCT PROPOSED CULVERT(S), HEADWALL & ENDWALL (AS REQUIRED BY PLANS), BACKFILL, CHANNEL IMPROVEMENTS, AND PROPOSED ROADWAY PER
PLANS.
9. UPON COMPLETION OF WORK, REMOVE ANY SEDIMENT ACCUMULATION BEHIND IMPERVIOUS DIKES.
10. REMOVE DOWNSTREAM, THEN UPSTREAM DIKE(S), ALL PUMPS, HOSES, AND STABILIZED OUTLETS. ALLOW FLOW THROUGH NEWLY CONSTRUCTED
CULVERT(5).
11. PREPARE AND STABILIZE SLOPES AND ALL OTHER DISTURBED AREAS. AREAS WITHIN JURISDICTIONAL WATERS SHALL BE RESTORED TO THE PRE-PROJECT
CONDITIONS.
12 UPON STABILIZATION OF ALL DISTURBED AREAS, REMOVE ALL TEMPORARY SEDIMENT CONTROL DEVICES.
SPECIAL STILIING BASIN
(DE-WATERING BAG)
CLEAN WATER PUMP-AROUND PUMP
/�.
� TEMPORARY FLEXIBLE HOSE
1
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y � IMPERVIOUS DIKE
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\ � — TOP OF BANK �NP.)
� �� TOE OF BANK (TYP.)
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/ � — STABILIZED OUTLET
� I , � TO STREAM BANK
;
STABILIZED OUTLET TO � l
STREAM BANK FLOW
PLAN VIEW
SPECIAL TOP OF BANK
TEMPORARY (TIE TO TEMPORARY
FLEXIBLE HOSE —:\ $TILLING STABILIZED OUTLET)
EXISTING BASIN —
TERRAIN �,
FIOW
GEOTEXTILE ' �,C� ���/y'-�:�;' !""s�i`�!yyy
FOR DRAINAGE :�=� � —��-�J'�\
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8" OF SEDIMENT 15 20 . 8
CONTROL STONE —' �
SPECIAL STILLING BASIN AND TEMPORARY STABILIZED OUTLET
PROFILE VIEW
APPROXIMATE BASE
FLOW WATER LEVEL � z, .—SANDBAG /STONE/SHEET PILE
\�--�-_`�- -T.�� , WORKING
FLOW � � �'-�� ^' AREA
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�� y II —IMPERVIOUS MEMBRANE
� 70' _►I� ,.
IMPERVIOUS DIKE DETAIL
SECTION A-A
NOTES:
1. ALL CULVERT AND CHANNEL WORK INVOLVING EXCAVATION SHALL BE PERFORMED IN
DRY CONDITIONS OR IN CHANNEL SECTIONS ISOLATED BY IMPERVIOUS DIKES AND KEPT
DE-WATERED.
2. THE CONTRACTOR SHALL NOT DISTURB MORE AREA THAN CAN BE STABILIZED THE SAME
WORKING DAY.
3. CLEAN WATER PUMP-AROUND PUMP AND HOSE SHALL ADEQUATELY CONVEY BASEfLOW.
DE-WATERING PUMP SHALL ADEQUATELY DE-WATER THE WORKING AREA AT THE
DOWNSTREAM IMPERVIOUS DIKE.
4. A GRAVITY-BASED SPECIAL STILLING BASW �DE-WATERING BAG� SHALL BE USED TO
COLLECT SILT AND SEDIMENT FROM THE WORK AREA DEWATERING. A TEMPORARY
STABILIZED OUTLET DOWNSTREAM OF THE SPECIAL STILLING BASIN MAY NOT BE
RE4UIRED IF THERE IS ADEQUATE AREA TO DIFFUSE THE EFFLUENT BEFORE RE-ENTRY INTO
THE STREAM AND THE NATIVE STREAMBED MATERIAL IS DEEMED SUITABLE AT THE
DISCHARGE LOCATION.
5. EFFLUENT FROM THE CLEAN WATER PUMP-AROUND MAY BE DISCHARGED DIRECTLY INTO
A STABILIZED OUTLET (NO SEDIMENT REMOVAL DEVICE REQUIRED). IF THE NATIVE
STREAMBED MATERIAL IS DEEMED SUITABLE AT THE DISGHARGE LOCATION, NO TEMPORARY
STABILIZED OUTLEf IS REQUIRED.
b. GEOTEXTILE FABRIC FOR DRAINAGE SHALL BE USED UNDERNEATH ALL $TONE PLACED FOR
SPECIAL STILLING BASINS AND TEMPORARY STABILIZED OUTLETS.
7. IMPERVIOUS DIKES SHALL BE CONSTRUCTED TO ISOLATE THE IN-STREAM WORKING AREA
AND SHALL NOT PERMIT SEEPAGE OF WATER INTO THE CONSTRUCTION SITE OR
CONTRIBUTE TO SILTATION Of THE STREAM. ACCEPTABLE MATERIALS FOR IMPERVIOUS
DIKES ARE SAND BAGS, STONE, OR SHEET PILES. USE OF SAND BAGS OR STONE SHALL
REQUIRE THE USE OF AN IMPERVIOUS FABRIC MEMBRANFIGEOTEXTILE .