SW1190703_Construction Sequence_9/9/2019

CONSTRUCTION SEQUENCE
TIMELINE OF FUTURE DEVELOPMENT IS UNKNOWN AT THIS TIME. SCM'S TO BE INSTALLED AND
DESIGNED WITH FUTURE DEVELOPMENT TO MEET STANDARDS.
1. CONTRACTOR SHALL VERIFY THAT ALL APPLICABLE PERMITS HAVE BEEN OBTAINED PRIOR TO
THE BEGINNING OF CONSTRUCTION, AND HOLD A PRECONSTRUCTION MEETING AND COORDINATE
WITH OWNER, ENGINEER, AND ALL APPLICABLE REGULATORY AGENCIES.
2. PROJECT IS LOCATED IN AN ENVIRONMENTALLY SENSITIVE AREA AND IS ADJACENT TO A TROUT
STREAM. CONTRACTOR SHALL USE EXTREME CARE THROUGHOUT PROJECT.
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4. CONTRACTOR SHALL NOTIFY ALL AFFECTED PROPERTY OWNERS AND OBTAIN PERMISSION FOR
PROPERTY ACCESS PRIOR TO PROCEEDING WITH WORK.
5. CONTRACTOR SHOULD LOCATE ALL EXISTING UTILITIES WITHIN THE DEFINED PROJECT AREA AS
SHOWN IN THE EROSION CONTROL PLAN. CONTRACTOR SHALL NOTIFY ENGINEER IF THERE ARE ANY
DISCREPANCIES BETWEEN THE PLANS AND FIELD CONDITIONS.
6. CONTRACTOR SHALL WORK WITHIN ALLOWABLE CONSTRUCTION LIMITS -SENSITIVE PROPERTY
OWNERS.
7. CONTRACTOR SHALL MAINTAIN VEHICULAR ACCESS ALONG CASHIERS LAKE ROAD (SR 1113) AT
ALL TIM ES.
8. STABILIZE CONSTRUCTION ENTRANCES AND ACCESS DRIVES WITH GRAVEL AND MULCH. STAKE
CLEARING LIMITS.
9. INSTALL ALL UPLAND SILT FENCE, AND OTHER MEASURES AS SHOWN ON PLANS, CLEARING
ONLY AS NECESSARY TO INSTALL THESE DEVICES.
10. ALL EROSION CONTROL MEASURES SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE NC
EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL AND US DEPT. OF AGRICULTURE.
11. CALL FOR ON -SITE INSPECTION BY INSPECTOR AND ENGINEER.
12. CONTRACTOR SHALL LOWER THE LAKE FROM THE NWSE OF 3471 TO 3467. THE DEWATERING
OF THE LAKE SHALL BE A GRADUAL PROCESS AND THE MAXIMUM RATE OF DRAWDOWN IS 0.5' PER
DAY. THE WATER FROM THE LAKE DRAWDOWN SHALL BE BYPASSED TO THE EXISTING CHATTOOGA
RIVER. DURING THE LAKE DRAWDOWN PROCESS CONTRACTOR SHALL ENSURE THE WATER BEING
REMOVED FROM THE LAKE INTO THE RIVER IS FREE OF SEDIMENT. IF SEDIMENT BECOMES A PROBLEM
DURING THE DEWATERING PROCESS CONTRACTOR SHALL CONTACT ENGINEER IMMEDIATELY.
13. ONCE THE LAKE IS LOWERED THE CONTRACTOR SHALL MAINTAIN MINIMUM BASE FLOW AT ALL
TIMES TO THE CHATTOOGA RIVER OF 70% OF INFLOW MEASURED BY INFLOW AND OUTFLOW METERS
(7Q10 INFORMATION TAKEN FROM NSGS). THE MINIMUM BASE FLOW SHALL BE ACCOMPLISHED BY
USING EITHER MECHANICAL PUMP OR SIPHON SYSTEM AND SHALL REMAIN IN OPERATION
THROUGHOUT THE DREDGING AND REFILLING PROCESS.

14. CONTRACTOR SHALL INSTALL & STABILIZE CONSTRUCTION ENTRANCES INTO LAKE BED.
15. CONTRACTOR SHALL INSTALL TEMP. SEDIMENT BASIN #1 WITH ALL ASSOCIATED TEMP. DITCHES
AND SILT FENCE AND TURBIDITY BAFFLES PRIOR TO ANY ACTIVITY WITHIN THE LAKE BED.
16. ONCE CONTRACTOR HAS APPROPRIATELY INSTALLED TEMP. SEDIMENT BASIN #1, CONTRACTOR
SHALL BEGIN INSTALLING TD #1 TO ESTABLISH NEW STABILIZED BASE CHANNEL WITH ASSOCIATED
TEMPORARY CROSSINGS TO ALLOW UPPER BASIN BASE FLOW TO BYPASS THE DREDGING AREA.
17. ONLY AFTER CONTRACTOR HAS ESTABLISHED AND STABILIZED TEMP. DITCH #1 SHALL
CONTRACTOR BE ALLOWED TO COMMENCE WITH ANY OTHER ACTIVITIES WITHIN THE LAKE BED.
18. ALL WETLAND AREA DREDGING SHALL BE DONE IN AN UPSTREAM TO DOWNSTREAM
DIRECTION. THIS IS SO DISTURBED SEDIMENT CAN BE CAPTURED IN THE DOWNSTREAM WETLAND.
SEDIMENT CURTAINS SHALL BE USED TO ISOLATE THE DREDGE AND FILL AREAS FROM OPEN WATER.
19. INSTALL SILT FENCE AND OTHER MEASURES AS SHOWN ON PLANS, CLEARING ONLY AS
NECESSARY TO INSTALL ALL DEVICES WITHIN THE LAKE BED AREA.
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SEQUENCE DESCRIBED IN ITEM #12.
21. THE CONTRACTOR SHALL DILIGENTLY AND CONTINUOUSLY MAINTAIN ALL EROSION CONTROL
DEVICES AND STRUCTURES. EROSION CONTROL MEASURES SHOULD BE CHECKED PERIODICALLY AND
AFTER EVERY RAINFALL EVENT. REPAIRS SHALL BE MADE IMMEDIATELY AS REQUIRED. INSPECTION AND
REPAIR REPORTS SHALL BE KEPT BY THE CONTRACTOR AND PROVIDED TO THE STATE EROSION
CONTROL AGENT UPON REQUEST.
22. CALL GEOTECHNICAL CONSULTANT FOR SITE INSPECTION PRIOR TO GRUBBING OR PLACING
FILL.
23. CONTRACTOR SHALL MAINTAIN ONE LANE OF TRAFFIC ON CASHIERS LAKE ROAD (NCDOT SR
1113) AT ALL TIMES.
24. WHEN SITE HAS BEEN PERMANENTLY STABILIZED, REMOVE EROSION CONTROL DEVICES AND
APPLY PERMANENT SEEDING IN AREAS OF DISTURBANCE.
25. COORDINATE WITH EROSION CONTROL INSPECTOR PRIOR TO REMOVAL OF EROSION CONTROL
MEASURES.
26. UPON COMPLETION OF THE CONSTRUCTION ACTIVITIES AND STABILIZATION THE LAKE WILL BE
GRADUALLY REFILLED, THIS WILL BE ACCOMPLISHED BY THE CONTRACTOR MAINTAINING THE
MINIMUM BASE FLOW AT ALL TIME TO THE CHATTOOGA RIVER AT A MINIMUM OF 70% OF THE
INCOMING FLOW (7Q10 INFORMATION TAKEN FROM NSGS). THE MINIMUM BASE FLOW SHALL BE
ACCOMPLISHED BY USING EITHER MECHANICAL PUMP OR SIPHON SYSTEM. FLOWS FROM THE DAM TO
THE CHATTOOGA RIVER MUST BE MAINTAINED AT ALL TIMES AT 70% OF THE INCOMING FLOW DURING
LAKE REFILL.