20180483 Ver 1_STREAM PUMP AROUND DETAIL-Model_20180406

PUMP AROUND DETAIL

SOURCE: MARYLAND'S GUIDELINES TO WATERWAY
CONSTRUCTION - DETAIL 1.2
SILT SACK OR
APPROVED
DEWATERING
DEVICE
WORK AREA
IMPERVIOUS SHEETING
PUMPS SHOULD
DISCHARGE ONTO
A STABLE
VELOCITY
DISSIPATOR MADE
OF RIP RAP OR
SANDBAGS
SEDIMENT
DIKE
FLOW
Section A-A
BASE FLOW + 1 FOOT
(2 FOOT MINIMUM)
CROSS SECTION OF
SANDBAG DIVERSION
CLEAN WATER
DIKE
INTAKE HOSE
WORK AREA LENGTH
NOT TO EXCEED THAT
WHICH CAN BE
COMPLETED IN ONE DAY
DEWATERING
PUMP
PLAN VIEW
P
DISCHARGE
HOSES
A
FLOW
SUMP-HOLE OR
POOL (12" TO 18"
DEEP 2' DIA.)
INTAKE
HOSE
STREAM
DIVERSION
PUMPS
P
A
PUMP-AROUND PRACTICE:
TEMPORARY MEASURE FOR DEWATERING STREAM AND POND CONSTRUCTION SITES.
DESCRIPTION:
THE WORK SHOULD CONSIST OF INSTALLING A TEMPORARY PUMP AROUND AND SUPPORTING MEASURES TO DIVERT FLOW AROUND POND DREDGE CONSTRUCTION SITES.
IMPLEMENTATION SEQUENCE:
SEDIMENT CONTROL MEASURES, PUMP-AROUND PRACTICES, AND ASSOCIATED DREDGE CONSTRUCTION SHOULD BE COMPLETED IN THE FOLLOWING SEQUENCE (REFER TO
DETAIL).
1. CONSTRUCTION ACTIVITIES INCLUDING THE INSTALLATION OF EROSION AND SEDIMENT CONTROL MEASURES SHOULD NOT BEGIN UNTIL ALL NECESSARY EASEMENTS
AND/OR RIGHTS-OF-WAYS HAVE BEEN ACQUIRED. ALL EXISTING UTILITIES SHOULD BE MARKED IN THE FIELD PRIOR TO CONSTRUCTION. THE CONTRACTOR IS RESPONSIBLE
FOR ANY DAMAGE TO EXISTING UTILITIES THAT MAY RESULT FROM CONSTRUCTION AND SHOULD REPAIR THE DAMAGE AT HIS/HER OWN EXPENSE TO THE COUNTY'S OR
UTILITY COMPANY'S SATISFACTION.
2. THE CONTRACTOR SHOULD NOTIFY THE SEDIMENT CONTROL INSPECTOR AT LEAST 5 DAYS BEFORE BEGINNING CONSTRUCTION. ADDITIONALLY, THE CONTRACTOR SHOULD
INFORM THE LOCAL ENVIRONMENTAL PROTECTION AND RESOURCE MANAGEMENT INSPECTION AND ENFORCEMENT DIVISION AND THE PROVIDER OF LOCAL UTILITIES A
MINIMUM OF 48 HOURS BEFORE STARTING CONSTRUCTION.
3. THE CONTRACTOR SHOULD CONDUCT A PRE-CONSTRUCTION MEETING ON SITE WITH THE CONSTRUCTION INSPECTOR, CITY PROJECT MANAGER, AND THE ENGINEER TO
REVIEW LIMITS OF DISTURBANCE, EROSION AND SEDIMENT CONTROL REQUIREMENTS, AND THE SEQUENCE OF CONSTRUCTION. THE CONTRACTOR SHOULD STAKE OUT ALL
LIMITS OF DISTURBANCE PRIOR TO THE PRE-CONSTRUCTION MEETING SO THEY MAY BE REVIEWED. THE PARTICIPANTS WILL ALSO DESIGNATE THE CONTRACTOR'S STAGING
AREAS AND FLAG ALL TREES WITHIN THE LIMITS OF DISTURBANCE WHICH WILL BE REMOVED FOR CONSTRUCTION ACCESS. TREES SHOULD NOT BE REMOVED WITHIN THE
LIMITS OF DISTURBANCE WITHOUT APPROVAL FROM THE LOCAL AUTHORITY.
4. CONSTRUCTION SHOULD NOT BEGIN UNTIL ALL SEDIMENT AND EROSION CONTROL MEASURES HAVE BEEN INSTALLED AND APPROVED BY THE ENGINEER AND THE
CONSTRUCTION INSPECTOR. THE CONTRACTOR SHOULD STAY WITHIN THE LIMITS OF THE DISTURBANCE AS SHOWN ON THE PLANS AND MINIMIZE DISTURBANCE WITHIN THE
WORK AREA WHENEVER POSSIBLE.
5. UPON INSTALLATION OF ALL SEDIMENT CONTROL MEASURES AND APPROVAL BY THE CONSTRUCTION INSPECTOR, THE CONTRACTOR SHOULD BEGIN WORK WITH THE
ESTABLISHMENT OF STABILIZED CONSTRUCTION ENTRANCES. THE SEQUENCE OF CONSTRUCTION MUST BE FOLLOWED UNLESS THE CONTRACTOR GETS WRITTEN
APPROVAL FOR DEVIATIONS FROM THE LOCAL AUTHORITY. THE CONTRACTOR SHOULD ONLY BEGIN WORK IN AN AREA WHICH CAN BE COMPLETED BY THE END OF THE DAY.
AT THE END OF EACH WORK DAY, THE WORK AREA MUST BE STABILIZED AND THE PUMP AROUND REMOVED. WORK SHOULD NOT BE CONDUCTED IN THE POND DURING RAIN
EVENTS.
6. SANDBAG DIKES SHOULD BE SITUATED AT THE ENDS OF THE WORK AREA AS SHOWN ON THE PLANS, AND POND WATER SHOULD BE PUMPED AROUND THE WORK AREA. THE
PUMP SHOULD DISCHARGE ONTO A STABLE VELOCITY DISSIPATER MADE OF RIPRAP OR SANDBAGS.
7. WATER FROM THE WORK AREA SHOULD BE PUMPED TO A SEDIMENT FILTERING MEASURE SUCH AS A DEWATERING BASIN, SILT SACK, OR OTHER APPROVED SOURCE. THE
MEASURE SHOULD BE LOCATED SUCH THAT THE WATER DRAINS DOWNSTREAM OF THE POND.
8. AFTER AN AREA IS COMPLETED AND STABILIZED, THE CLEAN WATER DIKE SHOULD BE REMOVED. AFTER THE FIRST SEDIMENT FLUSH, A NEW CLEAN WATER DIKE WOULD BE
ESTABLISHED FROM THE OLD SEDIMENT DIKE. FINALLY, UPON ESTABLISHMENT OF A NEW SEDIMENT DIKE BELOW THE OLD ONE, THE OLD SEDIMENT DIKE SHOULD BE
REMOVED.
9. A PUMP AROUND MUST BE INSTALLED ON ANY TRIBUTARY OR STORM DRAIN OUTFALL WHICH CONTRIBUTES BASEFLOW TO THE WORK AREA. THIS SHOULD BE
ACCOMPLISHED BY LOCATING A SANDBAG DIKE AT THE DOWNSTREAM END OF THE TRIBUTARY OR STORM DRAIN OUTFALL AND PUMPING THE STREAM FLOW AROUND THE
WORK AREA. THIS WATER SHOULD DISCHARGE ONTO THE SAME VELOCITY DISSIPATER USED FOR THE MAIN STEM PUMP AROUND.
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