BOARDMAN_FINAL_CERTIFIED_RTA_-_PLANS_09.27.2016.pdf

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CIVIL ABBREVIATIONS

EX./EXIST.

WM

C.P.

Y.D.

STM

SN

C & G

F.F.E.

I.E./INV.

T.P.

CB

MH

LB

EXISTING

WATER MAIN

CONTROL POINT WITH NUMBER

STORM YARD DRAIN

STORM SYSTEM

SANITARY SYSTEM

CURB & GUTTER

FINISH FLOOR ELEVATION

INVERT ELEVATION

TOP OF PIPE

STORM CATCH BASIN

STORM LEACH BASIN

PR./PROP. PROPOSED

DIA. DIAMETER

PVMT. PAVEMENT

TYP. TYPICAL

FRP FIBER REINFORCED PIPE

LF LINER FOOT

C.Y. CUBIC YARDS

S.Y. SQUARE YARDS

GAL. GALLON

CL CENTER LINE

MECH. MECHANICAL

RCP REINFORCED CONCRETE PIPE

INV INVERT

ELEV./EL. ELEVATION

N NORTHING

E EASTING

BTM. BOTTOM

C.O. CLEAN OUT

S.B. SOIL BORING

FT. FOOT

PP POWER POLE

ELEC. ELECTRICAL

PVC POLYVINYL CHLORIDE

W/L WATER LINE

HYD. HYDRANT

CONC. CONCRETE

P.O.B POINT OF BEGINNING

S.S. STAINLESS STEEL

1. THE CONTRACTOR SHALL HAVE SOLE AND COMPLETE RESPONSIBILITY FOR JOB SITE

CONDITIONS DURING THE COURSE OF CONSTRUCTION OF THIS PROJECT, INCLUDING SAFETY OF

ALL PERSONS AND PROPERTY.

2. THE CONTRACTOR SHALL DESIGN, CONSTRUCT, AND MAINTAIN ALL SAFETY DEVICES,

INCLUDING SHORING, AND SHALL BE SOLELY RESPONSIBLE FOR CONFORMING TO ALL LOCAL,

STATE, AND FEDERAL HEALTH AND SAFETY STANDARDS, LAWS, AND REGULATIONS TO INCLUDE

USACE EM 385-1-1.

3. THE CONTRACTOR IS REQUIRED TO TAKE DUE PRECAUTIONARY MEASURES TO PROTECT AND

MAINTAIN ANY EXISTING UTILITY SERVICES SHOWN ON THESE PLANS AND ANY OTHERS NOT OF

RECORD OR NOT SHOWN ON THESE PLANS. THE UTILITIES SHOWN ON THE PLANS ARE

APPROXIMATE LOCATIONS AND SHOULD BE INTERPRETED AS SUCH. THE CONTRACTOR IS

REQUIRED TO PROVIDE A MARK-OUT OF ALL UTILITIES WITHIN THE AREA OF WORK PRIOR TO

COMMENCING CONSTRUCTION. CONTRACTOR TO CALL MISS DIG (1-800-482-7171) TO OBTAIN

A MARK-OUT OF PUBLIC UNDERGROUND UTILITIES. THE CONTRACTOR SHALL CONTACT THE

PRIVATE UTILITIES (REFER TO SHEET C-0.1) TO ARRANGE FOR MARK-OUT OF PRIVATE UTILITIES

NOT LOCATED BY THE MISS DIG SYSTEM. CONTRACTOR SHALL BE AWARE OF HIGH-VOLTAGE

OVERHEAD ELECTRIC LINES. THE CONTRACTOR IS RESPONSIBLE FOR ALL DAMAGE TO EXISTING

UTILITIES AND ALL COSTS TO REPAIR DAMAGE TO ANY UTILITY (SEWERS, WATER, GAS,

ELECTRICAL, UNDERDRAIN SYSTEMS, & SPRINKLER SYSTEMS, ETC.) KNOWN, OR OTHERWISE,

SHALL BE BORNE SOLELY BY THE CONTRACTOR. ACCEPTANCE & APPROVAL OF SAID REPAIRS

SHALL BE PER THE OWNER OF THE DAMAGED UTILITY.

4. THE CONTRACTOR SHALL TAKE PRECAUTIONARY MEASURES TO ENSURE ALL UTILITY SERVICES

WILL REMAIN FUNCTIONAL DURING THE CONSTRUCTION PERIOD.

5. THE CONTRACTOR SHALL HAVE THE MOST RECENTLY APPROVED SET OF FINAL PLANS MARKED

“FOR CONSTRUCTION” ON THE JOB SITE AT ALL TIMES.

6. UPON COMPLETION OF EACH DAY'S WORK, THE CONTRACTOR SHALL BE RESPONSIBLE FOR

LEAVING THE WORK AREA FREE OF HAZARDS AND SHALL PROVIDE ALL NECESSARY TEMPORARY

SIGNS, WARNING DEVICES, AND BARRICADES.

7. THE CONTRACTOR SHALL KEEP ACCURATE AND LEGIBLE RECORDS OF ALL CHANGES OF WORK

THAT OCCUR DURING CONSTRUCTION AND INFORMATION ON “AS-BUILT” CONDITIONS.

DOCUMENTATION OF CHANGES AND AS-BUILT INFORMATION SHALL BE RECORDED ON AN

APPROVED SET OF FINAL PROJECT PLANS AND DELIVERED TO THE COR WITHIN 90 DAYS AFTER

COMPLETION OF WORK.

8. THE CONTRACTOR SHALL TAKE THE NECESSARY STEPS TO PROTECT THE PROJECT AND

ADJACENT PROPERTY, STRUCTURES, UTILITIES AND LANDSCAPING FROM ANY DAMAGE,

EROSION AND SILTATION THAT RESULTS FROM THE CONSTRUCTION BY APPROPRIATE MEANS

(SAND BAGS, HAY BALES, SILT FENCE, DIKES, ETC.) UNTIL SUCH TIME THE PROJECT IS

COMPLETED AND ACCEPTED BY THE GOVERNMENT.

9. THE CONTRACTOR SHALL REFER TO SPECIFICATION SECTION 01 11 00 SUMMARY OF WORK FOR

ALL PERMIT REQUIREMENTS AND GUIDANCE IN OBTAINING THE APPLICABLE PERMITS. THE

CONTRACTOR SHALL BE RESPONSIBLE FOR CONFORMANCE WITH ALL APPLICABLE PERMIT

REQUIREMENTS DURING THE EXECUTION OF THE WORK AND PRIOR TO FINAL ACCEPTANCE BY

THE GOVERNMENT. ADDITIONAL DETAILS ON CONTRACTOR RESPONSIBILITIES ARE PROVIDED

IN THE SPECIFICATIONS.

10. ALL NON-PAVED DISTURBED AREAS SHALL BE RESTORED AS SHOWN ON THE PLANS.

11. THE CONTRACTOR SHALL ACCESS THE WORK AREAS USING THE PUBLIC RIGHT-OF-WAY AND

EXISTING EASEMENTS ONLY. CROSSING PRIVATE PROPERTY TO ACCESS THESE AREAS WITHOUT

WRITTEN PERMISSION FROM THE PROPERTY OWNER IS PROHIBITED.

12. OTHER THAN PLANS THAT ARE ALREADY PART OF THE CONTRACT DOCUMENTS, HISTORIC

CONSTRUCTION DOCUMENTS ARE ALSO AVAILABLE FOR THE EARTHEN DAM EMBANKMENT,

CONCRETE CORE WALL, DAM INTAKE STRUCTURE, AND APPURTENANCES. IF ADDITIONAL

INFORMATION IS DESIRED, CONTRACTOR SHOULD SUBMIT REQUEST TO THE COR.

13. TOPOGRAPHY SHOWN HERE REPRESENTS CONDITIONS EXISTING AT THE TIME THE FIELD

SURVEY WAS MADE (MAY 2014).

14. WATER LEVEL IS SUBJECT TO CHANGE. THE CONTRACTOR IS RESPONSIBLE FOR MAKING A

DETERMINATION OF WATER LEVELS THAT MAY EXIST DURING CONSTRUCTION.

15. MEASURES SHALL BE TAKEN TO PREVENT DEBRIS FROM FALLING FROM THE EXISTING

STRUCTURES AND BEING TRANSPORTED DOWNSTREAM.

16. THE EXISTING CASS ROAD BRIDGE, DAM INTAKE STRUCTURES, AND POWERHOUSE SHALL NOT

BE REMOVED UNTIL THE AUXILIARY SPILLWAY AT THE EARTHEN DAM EMBANKMENT IS

CONSTRUCTED AND OPERATIONAL.

17. ALL WORK FOR THE CONDITIONS SHOWN AS "PROPOSED" IS REQUIRED UNDER THIS

CONTRACT.

GENERAL NOTES

THE PURPOSE OF THE WORK SHOWN ON THESE PLANS IS THE DEWATERING OF THE BOARDMAN

IMPOUNDMENT, DESIGN AND CONSTRUCTION OF AN AUXILIARY SPILLWAY THROUGH THE

EARTHEN DAM EMBANKMENT, EXCAVATION AND RELOCATION OR DISPOSAL OF SOILS AND

MATERIALS WITHIN THE LIMITS OF EXCAVATION, REMOVAL OF THE EXISTING DAM STRUCTURE

AND APPURTENANCES, RECONSTRUCTION OF CASS ROAD, AND RESTORATION OF THE BOARDMAN

RIVER. THE WORK GENERALLY INCLUDES, BUT IS NOT LIMITED TO, CONCRETE REMOVAL,

REMOVAL AND DISPOSAL OF FILL/SEDIMENT MATERIALS, CONSTRUCTION OF THE RIVER CHANNEL

THROUGH THE EARTHEN EMBANKMENT, CONSTRUCTION OF INSTREAM HABITAT IN THE

RESTORED RIVER, AND RESTORATION OF THE RIVER BANK AND FLOODPLAIN AREAS. THIS WORK

WILL BE CONDUCTED WHILE CONTRACTOR ACTIVELY MANAGES WATER LEVELS IN BOARDMAN

POND AND FLOW OVER BOARDMAN DAM WITHIN THE CONSTRAINTS SPECIFIED IN THESE PLANS.

THE MDEQ HYDROLOGIC STUDIES UNIT PROVIDED THE FOLLOWING HYDROLOGY INFORMATION

FOR THE BOARDMAN RIVER AT THE LOCATION OF BOARDMAN DAM:

TOTAL DRAINAGE AREA OF 266.9 SQUARE MILES AND CONTRIBUTING DRAINAGE AREA OF 205

SQUARE MILES

MDEQ 50 % FREQUENCY DISCHARGE VALUES (HALF OF FLOWS ARE GREATER AND HALF ARE LESS)

FOR THE SUMMER MONTHS DURING WHICH CONSTRUCTION WILL TAKE PLACE:

MAY 310 CFS

JUNE 270 CFS

JULY 240 CFS

AUG 230 CFS

SEPT 230 CFS

OCT 250 CFS

NOV 270 CFS

DEC 270 CFS

MDEQ PROVIDED FLOOD DISCHARGE VALUES:

50% (2 YEAR) 800 CFS

10% (10 YEAR) 1200 CFS

2% (50 YEAR) 1500 CFS

1% (100 YEAR) 1700 CFS

0.5% (200 YEAR) 1900 CFS

0.2% (500 YEAR) 2200 CFS

THE DESIGN DISCHARGE FOR THE DAM REMOVAL IS THE 10% (10 YEAR) FLOOD (1200 CFS).

A STAFF GAGE WILL BE INSTALLED UPSTREAM OF THE PROJECT SITE TO MONITOR FLOWS EVERY 12

HOURS EXCEPT DURING AND AFTER STORM EVENTS WHEN INFLOW SHOULD BE MONITORED

HOURLY UNTIL 12 HOURS FOLLOWING THE PEAK FLOW. THE GOVERNMENT REPRESENTATIVE

WILL PROVIDE THE STAGE DISCHARGE CURVE FOR THE STAFF GAGE.

TO COMPLY WITH THE MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY REGULATION OF A

MAXIMUM DEWATERING RATE OF 1 FT/DAY, CONTRACTOR SHALL SURVEY WATER SURFACE

ELEVATION AT THE DAM EVERY 12 HOURS.

THE SIPHON SYSTEM SPECIFIED FOR THIS PROJECT HAS THE CAPACITY TO DISCHARGE UP TO 400 CFS. THE AUXILIARY SPILLWAY SPECIFIED IN THESE PLANS HAS THE CAPACITY TO CARRY UP TO

1200 CFS. THE COMBINED DESIGN CAN ACCOMMODATE UP 1600 CFS.

MORE DETAILS ABOUT THE OPERATION, HISTORY AND CONDITION OF THE DAM ARE AVAILABLE IN

THE FOLLOWING DOCUMENTS, WHICH ARE ON FILE AND AVAILABLE FOR REVIEW BY

APPOINTMENT WITH WILLIAM MERTE USACE - DETROIT DISTRICT (313) 226-2433:

1. BOARDMAN DAM DESIGN PLANS DATED 1930 PREPARED BY HARZA ENGINEERING COMPANY

FOR THE CITY OF TRAVERSE CITY.

2. BOARDMAN RIVER FEASIBILITY STUDY DATED JANUARY 2009 PREPARED BY ENVIRONMENTAL

CONSULTING AND TECHNOLOGY, INC.

3. PROBABLE MAXIMUM FLOOD STUDY, BOARDMAN AND SABIN HYDROELECTRIC DAMS, FERC

PROJECT. DATED SEPTEMBER 1995. PREPARED BY MEAD AND HUNT, INC.

4. PROBABLE MAXIMUM FLOOD STUDY, BROWN BRIDGE AND BOARDMAN DAMS, FERC PROJECT.

DATED SEPTEMBER 1995. PREPARED BY MEAD AND HUNT, INC.

5. SPILLWAY DESIGN FLOOD STUDIES, BROWN BRIDGE, BOARDMAN, AND SABIN PROJECTS

DATED JULY 17, 1991 PREPARED BY MEAD AND HUNT, INC.

6. UNITED STATES ARMY CORP OF ENGINEERS (USACE) FEASIBILITY STUDY, PHASE I REPORT

DATED AUGUST 2013. PREPARED BY THE USACE.

ENGINEER'S STATEMENT

1. PROTECTION OF WORK

DURING THE EXECUTION OF THE WORK SHOWN ON THESE PLANS, THE CONTRACTOR SHALL

BE RESPONSIBLE FOR PROTECTION OF THE WORK AREA AND EQUIPMENT FROM FLOODS AND

DAMAGE OR DELAYS DUE TO FLOODS. NO EQUIPMENT SHALL BE LEFT IN CHANNEL AFTER

WORK HOURS.

2. BREACHING SAFETY

IN THE CASE OF AN UNEXPECTED BREACH THROUGH THE DAM EMBANKMENT THE

CONTRACTOR SHALL HAVE A STOCKPILE OF DEMOLISHED CONCRETE MATERIALS NEARBY FOR

EMERGENCY PLACEMENT. THIS MATERIAL WILL COME FROM THE DEMOLITION OF THE TOP

OF THE CONCRETE CORE WALL. ALSO RECOMMEND THE CONTRACTOR TO HAVE EXTRA SAND

BAGS AVAILABLE. CONTRACTOR SHALL PREPARE SITE SPECIFIC HEALTH & SAFETY PLAN,

INCLUDING EMERGENCY ACTION PLAN. THIS EMERGENCY ACTION PLAN SHALL BE REVIEWED

AND COORDINATED WITH THE GRAND TRAVERSE COUNTY EMERGENCY MANAGER.

SPECIAL NOTES

THE GRAND TRAVERSE COUNTY, THE GRAND TRAVERSE COUNTY ROAD COMMISSION,

CONTRACTOR, AND COR SHALL COORDINATE AND ARRANGE FOR A PRECONSTRUCTION

MEETING AT THE SITE PRIOR TO THE START OF CONSTRUCTION. PRIOR TO THE TIME OF THE

PRECONSTRUCTION MEETING, THE CONTRACTOR SHALL HAVE THE LIMITS OF THE WORK

(GRADING, SHEET PILE, AND TEMPORARY ACCESS ROAD) STAKED AND THE LOCATIONS OF

EXISTING UTILITIES MARKED OUT. THE PURPOSE OF THIS IS TO CONFIRM THE PROPOSED

WORK WILL NOT CONFLICT WITH THE ADJACENT SITES. IF A CONFLICT IS IDENTIFIED AT THAT

TIME, THE CONTRACTOR SHALL REQUEST DIRECTION FROM THE GOVERNMENT PER THE

CONTRACT.

PRECONSTRUCTION MEETING

SPW TEMPORARY SHEET PILE WALL

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MANHOLE (ANY UTILITY)

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AFTER BIDS HAVE BEEN SUBMITTED AND A SELECTION IS MADE, ELECTRONIC FILES WILL BE

PROVIDED TO THE CONTRACTOR FOR LOCATING KEY DESIGN ITEMS.

ELECTRONIC FILES

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COORDINATE SYSTEM: STATE PLANE

ZONE: MICHIGAN CENTRAL 2112

ELLIPSOID: GRS 80

HORIZONTAL DATUM: NAD 83 (CORS 2011)

VERTICAL DATUM: NAVD 88

GEOID: GEOID 12A

UNITS: INTERNATIONAL FEET

SURVEY GENERAL NOTES

PLAN ELEVATION

ELEVATIONS SHOWN ON THESE PLANS ARE NAVD88 FROM GPS OBSERVATIONS.

GENERAL NOTES

PROJECT PERFORMED TO LOCAL AGENCY STANDARDS.

CP1 N 506321.70 E 19358566.81 Z 650.88

"POINT 1"

SET 1/2" DIAMETER REBAR 18" LONG WITH CONTROL POINT CAP

FLUSH WITH GRADE 21' NORTH OF CASS ROAD CENTERLINE 360'

WEST OF EXISTING BRIDGE.

CP2 N 505985.00 E 19358822.06 Z 655.63

CP4 N 505869.33 E 19357931.16 Z 659.29

CP5 N 505898.29 E 19358217.32 Z 659.18

CP6 N 506007.30 E 19359524.45 Z 660.75

"POINT 6"

SET 1/2" DIAMETER REBAR 18" LONG WITH CONTROL POINT CAP

FLUSH WITH GRADE IN THE SOUTHWEST QUADRANT OF CASS

ROAD AND KEYSTONE ROAD, 69' WEST OF KEYSTONE ROAD

CENTERLINE AND 55' SOUTH OF CASS ROAD CENTERLINE.

CP7 N 506106.51 E 19359181.62 Z 660.62

"POINT 7"

SET 1/2" DIAMETER REBAR 18" LONG WITH CONTROL POINT CAP

FLUSH WITH GRADE 40' SOUTH OF CASS ROAD CENTERLINE 175'

EAST OF EXISTING BRIDGE.

CP8 N 506455.18 E 19357972.57 Z642.89

"POINT 8"

SET 1/2" DIAMETER REBAR 18' LONG WITH CONTROL POINT CAP

FLUSH WITH GRADE 18' SOUTH OF CASS ROAD CENTERLINE IN

CURVE 40' WEST OF OLD CULVERT CROSSING.

CP9 N 506730.15 E 19357742.67 Z 650.51

CP10 N 507187.84 E 19357678.71 Z 672.34

CP11 N 506237.43 E 19358006.60 Z 622.83

CP12 N 506327.12 E 19357857.34 Z 635.80

CP13 N 505954.16 E 19358519.75 Z 659.02

CP14 N 506367.22 E 19358235.34 Z 639.30

CP15 N 506246.08 E 19358382.97 Z 637.69

CP16 N 506143.22 E 19358575.92 Z 652.26

CP17 N 507160.43 E 19357653.36 Z 672.81

CP19 N 506607.49 E 19357810.02 Z 646.17

CP20 N 506902.61 E 19358235.26 Z 619.77

CP21 N 506934.07 E 19358087.86 Z 623.98

PROJECT CONTROL

CONTROL POINTS SET

BENCHMARKS FOUND

BM1 N 506283.36 E 19358832.64 Z 661.54

"BM#1"

FOUND "X" IN CONCRETE SLAB 93' WEST OF WEST WALL OF DAM

SPILLWAY 47' NORTH OF CENTERLINE OF CASS ROAD.

BENCHMARKS SET

BM2 N 506831.99 E 19357703.89 Z 655.15

"BM#2"

SET SPIKE IN POWER POLE 36' WEST OF CASS ROAD

CENTERLINE 61' SOUTH OF PC OF CURVE.

BENCHMARKS

THERE ARE NO GOVERNMENT CORNERS WITHIN THE PROJECT LIMITS.

GOVERNMENT CORNERS

NO ALIGNMENT POINTS WERE SET AS PART OF THIS PROJECT.

ALIGNMENT(S) POINTS

THE CONSTRUCTION SEQUENCE FOR THE BOARDMAN DAM REMOVAL AND RIVER RESTORATION PROJECT WAS DRAFTED TO PROVIDE FOR THE SAFEST DEWATERING POSSIBLE WHILE ACCOMMODATING FLEXIBILITY IN WATER LEVEL CONTROL FOR SEDIMENT MANAGEMENT PURPOSES. THE SIPHON SYSTEM PROPOSED IS DESIGNED TO ACCOMMODATE NORMAL SUMMER FLOWS UP TO 97% OF THE DAILY MEASURED FLOWS. THE AUXILIARY SPILLWAY WAS DESIGNED FOR EMERGENCY FLOWS WHICH WOULD INCLUDE LARGE STORM EVENTS OUTSIDE OF THE CAPACITY OF THE SIPHON BYPASS SYSTEM. THE SEQUENCE OF CONSTRUCTION FOR THE AUXILIARY SPILLWAY WAS DETERMINED BY A STABILITY ANALYSIS OF THE CONCRETE CORE WALL, WHICH STATES THAT THE CORE WALL IS CAPABLE OF HANDLING A MAXIMUM OF 8 FEET OF UNBALANCED LOADS.

1. THE PROPOSED CASS ROAD BRIDGE WILL BE COMPLETED BY OTHERS PRIOR TO THE START OF THE

DAM BREACHING.

2. INSTALL TEMPORARY SOIL EROSION MEASURES PRIOR TO EARTH MOVING ACTIVITIES.

3. INSTALL THE CONSTRUCTION ACCESS ROAD AT THE SOUTH END OF THE PROJECT AREA FOR ACCESS INTO THE UPPER IMPOUNDMENT AND BEGIN RIVER CHANNEL AND FLOODPLAIN WORK WITHIN THE

UPPER IMPOUNDMENT BETWEEN STATIONS 256+00 - 243+50, WHERE THE PROPOSED RESTORED

RIVER AREAS ARE ALREADY EXPOSED AND DEWATERED (SHEET R-0.2).

4. INSTALL CONSTRUCTION ACCESS ROADS TO THE EAST AND WEST SIDE OF THE DAM, AS WELL AS A STAGING AREA FOR EQUIPMENT PARKING AND WASHING. INSTALL THE CONSTRUCTION ACCESS ROAD

NORTH OF CASS ROAD INTO THE BEAVER POND AREA (STAGE 1, SHEET B-1.1).

5. EXCAVATE TEMPORARY CHANNEL FROM PROPOSED STILLING BASIN & SIPHON OUTLET TO SABIN

POND. TEMPORARY CHANNEL TO BE ROUGHLY GRADED TO CHANNEL INVERT OF PROPOSED

RESTORED RIVER CHANNEL. BY WORKING FROM SABIN IMPOUNDMENT TO BOARDMAN DAM, THE

PROPOSED CHANNEL WILL FACILITATE THE DRAINING OF THE BEAVER POND. INSTALL CONSTRUCTED RIVER CHANNEL AND BANKS UNDER CASS ROAD BRIDGE, AS INDICATED IN THE RESTORATION PLANS.

INSTALL CASS ROAD BRIDGE RIPRAP ALONG ABUTMENTS. (STAGE 1, SHEETS B-2.1 - B-2.3; SHEETS

R-1.4, R-3.3, SHEET B-6.4).

6. CONSTRUCT SIPHON OUTLET ENERGY DISSIPATION FOR SIPHONING OPERATION DISCHARGE AND TAILWATER BERMS FOR SIPHON OUTLET AND AUXILIARY SPILLWAY OUTLET. (STAGE 1, SHEETS B-2.1, B-3.5, B-8.1 AND B-8.3).

7. EXCAVATE TOP CUT OF DAM TO AN ELEVATION OF 646, LEAVING 2 FEET OF EXPOSED CONCRETE CORE WALL. NOTCH OUT THE CORE WALL AS NECESSARY FOR THE INSTALLATION OF SIPHON PUMPING PAD AND PIPING. INSTALLATION OF THE SIPHON BYPASS SYSTEM WILL TAKE APPROXIMATELY 24 DAYS TO COMPLETE. THEREFORE, THIS STEP MUST BE COMPLETE NO MORE THAN 24 DAYS PRIOR TO THE

ANTICIPATED START OF THE DEWATERING OPERATION (STAGE 1, SHEET B-2.1).

8. PLACE SPOILS FROM DAM EXCAVATION IN AREA DESIGNATED WEST OF CURRENT DAM INTAKE

CHANNEL (STAGE 1, SHEET B-1.1)

9. INSTALL SIPHONS AND APPURTENANCES AND BEGIN DEWATERING OPERATION (STAGE 2, SHEET B-3.1

- B-3.4).

10. EXCAVATE FOR AUXILIARY SPILLWAY AS NECESSARY TO INSTALL LOWER 70' OF ARTICULATED BLOCK CHANNEL AS WELL AS THE AUXILIARY SPILLWAY STILLING BASIN. MAINTAIN TOP WIDTH AT 646' AS NECESSARY FOR CONSTRUCTION TRAFFIC. THIS PRELIMINARY INSTALLATION WILL REDUCE THE TIME NECESSARY TO EXCAVATE AND INSTALL THE REMAINING AUXILIARY SPILLWAY TO ELEVATION 623'

(STAGE 2, SHEET B-3.1).

11. BEGIN RIVER CHANNEL EXCAVATION IN THE UPPER IMPOUNDMENT BETWEEN STATIONS 244+50 - 224+00, PLACING SPOILS IN THE CLOSEST DESIGNATED AREAS AS APPROPRIATE (SHEET R-0.3).

12. BUILD SEDIMENT TRAPS AT THE LOCATIONS SHOWN ON THE PLANS TO MITIGATE MIGRATION OF

SEDIMENT DOWNSTREAM. ACTUAL SEDIMENT TRAP LOCATION MAY BE ADJUSTED BY COR IN THE

FIELD.

13. PROGRESS RIVER EXCAVATION AND RESTORATION FURTHER INTO THE IMPOUNDMENT, WORKING

BETWEEN STATIONS 224+00 - 210+00 WHEN THE IMPOUNDED WATER SURFACE ELEVATION HAS

REACHED 633 FEET. DISPOSE OF SPOILS IN THE CLOSEST DESIGNATED AREAS AS APPROPRIATE (SHEET R-0.3).

14. DEWATER IMPOUNDMENT TO ELEVATION 627 WITH SIPHONS. MANAGE SEDIMENT MIGRATION

THROUGHOUT THE IMPOUNDMENT WITH INTERMITTENT SEDIMENT TRAPS. SIPHONS WILL BE USED

TO MAINTAIN IMPOUNDMENT WATER SURFACE ELEVATION OF 627. (STAGE 3, SHEET B-4.1).

15. PROGRESS RIVER EXCAVATION AND RESTORATION TO STATIONS 210+00 - 176+00 WHEN IMPOUNDED

WATER SURFACE ELEVATIONS ARE BETWEEN 633 FEET AND 623 FEET (SHEET R-0.3).

16. PRIOR TO FINAL EXCAVATION AND INSTALLATION OF AUXILIARY SPILLWAY, RIVER SHALL BE OBSERVED AT BASE FLOW CONDITIONS (~250 CFS) FOR THREE DAYS AND TEN DAY WEATHER FORECAST SHALL HAVE A TOTAL PREDICTED PRECIPITATION OF LESS THAN 0.25 INCHES. ADDITIONALLY, GROUT

CYLINDERS FROM STILLING BASIN SHALL PASS 14 DAY STRENGTH TEST.

17. INSTALL ADDITIONAL CONSTRUCTION ACCESS ROAD INTO THE IMPOUNDMENT, AS WATER LEVEL ALLOWS. THIS ACCESS ROAD WILL BE USED FOR THE EXCAVATION OF THE AUXILIARY SPILLWAY AND

DREDGED CHANNEL UPSTREAM OF THE CONCRETE COREWALL (STAGE 3, SHEET B-4.1).

18. EXCAVATE UPSTREAM AND DOWNSTREAM AUXILIARY SPILLWAY CHANNEL AND INSTALL ARTICULATED

CONCRETE BLOCK ARMORING TO ELEVATION 623. REMOVE THE CONCRETE COREWALL DOWN TO

ELEVATION 627. WHILE DEMOLISHING CONCRETE COREWALL, NO MORE THAN 10 FEET OF VERTICAL WALL SHALL BE EXPOSED AT ONE TIME AND UNBALANCED LOADING (GRADE DIFFERENTIAL UPSTREAM AND DOWNSTREAM) OF WALL SHALL BE LIMITED TO NO MORE THAN 8 FEET (STAGE 3, SHEET B-4.1).

THIS ACTIVITY SHALL BE COMPLETED UTILIZING 24HR OPERATIONS TO REDUCE DURATION OF

INSTALLATION AND THEREFORE REDUCE RISK OF EXCEEDANCE OF SIPHON CAPACITY.

19. SIPHON FUNCTION WILL DIMINISH AS WATER IS LOWERED WITHIN THE IMPOUNDMENT AND WILL BE SHUT OFF AND REMOVED AS FLOW IS DIVERTED THROUGH THE AUXILIARY SPILLWAY (STAGE 3, SHEET B-4.1).

20. BEGIN REMOVAL OF EXISTING POWERHOUSE, INTAKES, SPILLWAY, CONCRETE WING WALLS, AND THE

OLD CASS ROAD BRIDGE. COORDINATE WITH THE COR AND THE GRAND TRAVERSE DEPUTY

ADMINISTRATOR JENNIFER DEHAAN AT (231) 922-4756 ON REMOVAL OF TRASH RACK SYSTEM AND

REMAINING HYDROELECTRIC POWER EQUIPMENT. BEGIN CONSTRUCTION OF CASS ROAD (SHEETS

S-1.1 - S-6.4).

21. WITHIN THE AUXILIARY SPILLWAY, NOTCH THE CONCRETE CORE WALL DOWN AT 1 FOOT INCREMENTS FROM ELEVATION 627 TO 623, IN ACCORDANCE WITH PERMIT REQUIREMENTS, UNTIL CORE WALL

CREST REACHES SHEET PILING (ELEVATION OF 623) (STAGE 4, SHEET B-5.1 AND B-5.2).

22. ONCE AN IMPOUNDMENT WSE OF 625 IS REACHED, INSTALL BULK BAG COFFERDAM AND EXCAVATE

PROPOSED RIVER CHANNEL DOWNSTREAM OF COREWALL. EXPOSE UPSTREAM FACE OF CORE WALL

WHILE MAINTAINING MINIMUM 50 FEET WIDE DIRT PLUG. REMOVE COREWALL TO 4 FEET BELOW

FINAL CHANNEL ELEVATION (STAGE 5, SHEET B-6.1 AND B-6.2).

23. DIRT PLUG WILL BE REMOVED AND FLOW DIVERTED TO RESTORED CHANNEL THROUGH DAM (STAGE

5, SHEET B-6.2) THROUGH SEQUENTIAL REMOVAL OF BULK BAGS OVER 24 HOUR PERIOD.

24. REMOVE AUXILIARY SPILLWAY STILLING BASIN AND ARTICULATED BLOCK. COMPLETE FINAL GRADING

AND RESTORATION (STAGE 6, SHEET B-7.1).

25. COMPLETE RESTORATION OF RIVER CHANNEL FROM DAM EMBANKMENT TO SABIN POND, INCLUDING

FINISHED GRADING OF RIVER CHANNEL AND FLOODPLAIN .

SUGGESTED CONSTRUCTION SEQUENCINGCP22 N 506752.77 E 19358085.76 Z 618.42

CP23 N 506602.7693 E 19358510.53 Z 637.11

CP24 N 506603.73 E 19357992.23 Z 636.69

CP25 N 506471.26 E 19358469.87 Z 645.17

CP26 N 506373.90 E 19358377.53 Z 638.57

CP500N 506945.21 E 19358230.36 Z 660.54

NORTH TOPOGRAPHIC LIMITS

CP501N 506945.21 E 19357730.36 Z 660.53

NORTH TOPOGRAPHIC LIMITS

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THE FOLLOWING ARE CRITICAL PATH ITEMS WHERE THESE ITEMS MUST BE DONE BEFORE CERTAIN ASPECTS

OF THE CONSTRUCTION CAN PROGRESS.

1. COMPLETE EXCAVATION OF TEMPORARY CHANNEL FROM SABIN POND TO PROPOSED STILLING BASIN

AND SIPHON OUTLET, INSTALL CONSTRUCTED RIVER CHANNEL AND BANKS UNDER CASS ROAD

BRIDGE, INCLUDING BRIDGE RIPRAP ALONG ABUTMENTS, AND CONSTRUCT STILLING BASIN AND

SIPHON OUTLET PRIOR TO STARTING SIPHON AND BREACHING OPERATION.

2. DETERMINE ANTICIPATED START OF THE DEWATERING OPERATION PRIOR TO EXCAVATION OF THE TOP CUT OF THE DAM, AS EXCAVATION OF THE TOP CUT OF THE DAM SHALL NOT OCCUR MORE THAN

24 DAYS PRIOR TO THE ANTICIPATED START OF DEWATERING.

3. OBSERVE BASE FLOW CONDITIONS IN THE RIVER FOR A MINIMUM OF THREE DAYS WITH A TEN DAY WEATHER FORECAST WITH TOTAL PREDICTED PRECIPITATION OF LESS THAN 0.25 INCHES PRIOR TO

FINAL EXCAVATION AND INSTALLATION OF AUXILIARY SPILLWAY STRUCTURE.

4. FULLY CONSTRUCT THE AUXILIARY SPILLWAY PRIOR TO REMOVING POWERHOUSE AND INTAKE

STRUCTURE AND FILLING THE INTAKE CHANNEL WITH SPOILS.

5. DEWATER IMPOUNDMENT TO A WSE OF 625 PRIOR TO EXCAVATION OF PROPOSED RIVER CHANNEL

DOWNSTREAM OF COREWALL.

CRITICAL PATH ITEMS

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SURVEY BYBENCHMARKS (DATUM NAVD 88)

BM# 1 FOUND "X" IN CONCRETE SLAB 93' WEST OF WEST WALL OF DAM SPILLWAY 47'

NORTH OF CENTERLINE OF CASS ROAD. ELEV. = 661.54

BM# 2 SET SPIKE IN POWER POLE 36' WEST OF CASS ROAD CENTERLINE 61' SOUTH OF

PC OF CURVE. ELEV. = 655.15

CASS ROAD TOPOGRAPHY

SURVEY BYDESCRIPTION

BATHYMETRY DATA WITHIN BOARDMAN IMPOUNDMENT WAS COLLECTED BY INTERFLUVE, INC.

BETWEEN JULY 29 AND 31, 2014. DATA WAS COLLECTED USING A SONAR DEVICE ATTACHED TO

A BOAT.

BOARDMAN IMPOUNDMENT

BATHYMETRY

SURVEY BY

A 600' SWATH OF LIDAR DATA WAS COLLECTED ALONG THE BOARDMAN RIVER IN 2002 BY

GRAND TRAVERSE COUNTY. 2' CONTOUR INTERVALS ARE SHOWN ON THIS DRAWING.

BOARDMAN RIVER LIDAR

GRAND TRAVERSE COUNTY

DESCRIPTION

LIMITS OF CONSTRUCTION

SUGGESTED TEMPORARY

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STATE OF MICHIGAN RAILROAD LINE

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G B

G B

G B

G B

G B

G

B

20'

20'

20'

C A

S

R

D

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A C

K A

N

R

U S

H

BOARDMAN

IMPOUNDMENT

SABIN

POND

BROAD

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BLAIR TWP.

GARFIELD TWP.

W I L L I A

M

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TEMPORARY SPOILS

STORAGE

OVERHEAD ELECTRIC

(REMOVED BY OTHERS)

B - 1.1

BR

EA

CH

IN

G

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EN

ER

AL

S

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E

PL

AN

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N

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N 3/3

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ES

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WETLAND AREA

WETLAND AREA

RECOMMENDED EQUIPMENT

STAGING AREA (ACTUAL

STAGING AREAS TO BE

COORDINATED BETWEEN

CONTRACTOR & COR

TEMPORARY

CONSTRUCTION

ENTRANCE

POWERHOUSE

CONCRETE SPILLW

AY

CONSTRUCTION

ACCESS ROAD

SEE SHEET B-1.4

FOR DETAIL

SIPHON

PUMPING PAD

SEE SHEET B-3.2

SIPHON OUTLET

ENERGY

DISSIPATION

SEE SHEET B-3.3

FOR DETAILS

STILLING BASIN OUTLET

SEE SHEETS B-7.1 - B-7.3

FOR DETAILS

TAILWATER BERM

SEE SHEETS B-7.1 - B-7.4

FOR DETAILS

(4) 36" HDPE

SEE SHEETS B-7.1 - B-7.4

FOR DETAILS

ARTICULATED

BLOCK LIMITS OF AUXILIARY

SPILLWAY CHANNEL

GRADING

LIMITS OF AUXILIARY

SPILLWAY CHANNEL

GRADING

CHANNEL

TOP OF BANK

CHANNEL

ALIGNMENT

LEGEND

RIVER CHANNEL TOP

RIVER CHANNEL FLOODPLAIN

EXISTING MAJOR

GUARDRAIL

OVERHEAD ELECTRIC

WETLAND BOUNDARY

RIP RAP

OF BANK

GBGRADE BREAK LINE

PAVEMENT BOUNDARY

CONSTRUCTION

ACCESS / SIPHON PAD

CONTOUR LINE

EXISTING MINOR

CONTOUR LINE

CONSTRUCTION

ACCESS ROAD

SEE SHEET B-1.4

FOR DETAIL

CONSTRUCTION ACCESS ROAD

SEE DETAIL SEE SHEET

B-1.4 FOR DETAIL

6/3 /15

D

ES

IG

N

RE

VI

EW

EXISTING TREE LINE

TREE CLEARING LIMITS

REQUIRED AS

NECESSARY

SIPHON PIPES

SEE SHEET B-3.2

PROPOSED TREE

CLEARING LIMITS

REQUIRED AS

NECESSARY

EXISTING TREE

LINE

SIPHON PIPES

EXISTING

CONCRETE

COREWALL

AUXILIARY

SPILLWAY

EXISTING

INTAKE

OLD CASS ROAD

BRIDGE

CULVERTS

8/2 1/1

0%

D

ES

IG

N

RE

VI

EW

SPILLWAY STILLING

BASIN. SEE SHEETS B-7.1 - B-7.3

FOR DETAILS

GRAVEL

GRAVEL

OBSERVATION AREA

TO BE QUARANTINED

FROM CONSTRUCTION

EQUIPMENT AND ACTIVITY

CONSTRUCTION FENCING

PUBLIC OBSERVATION

AREA

CONSTRUCTION

FENCING

PUBLIC PARKING AREA

PUBLIC PARKING

AREA

LIMITS OF DISTURBANCE

TEMPORARY

CONSTRUCTION

ENTRANCE

Know what's

R

SURVEY CONTROLPOINT

1. IMPOUNDMENT WATER SURFACE SHOULD BE MONITORED AT ALL TIMES.

2. MAINTAIN REQUIRED AMOUNT OF FREEBOARD (AS NOTED IN CONSTRUCTION SEQUENCING)

AT ALL TIMES.

3. INSTALLATION OF STAFF GAGE AT THE DAM SITE MUST BE DONE PRIOR TO BEGINNING

CONSTRUCTION

4. DRAWDOWN RATE OF IMPOUNDMENT WATER SURFACE LIMITED TO 1' PER DAY BY PERMIT

5. EXISTING PARK SIGNAGE AND FENCING TO BE PROTECTED TO EXTENT POSSIBLE. SIGNAGE AND

FENCING DAMAGED OR REMOVED TO BE REPLACED IN KIND.

DAM BREACHING NOTES

TEMPORARY

GATE

TEMPORARY

GATE

OVERHEAD SIGN

(TO BE REMOVED)

SAFETY BUOY AND CABLE

(TO BE REMOVED)

PROTECT

TREES

PROTECT

TREES

PROTECT EXISTING

PARK SIGN

AUXILIARY SPILLWAY

CHANNEL. SEE SHEETS

B-7.1 - B-7.3 FOR DETAILS

/23

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CONSTRUCTION

ACCESS ROAD

SEE SHEET B-1.4

FOR DETAIL

CONTROL POINT 4

NORTHING: 505869.3333

EASTING: 19357931.1584

CONTROL POINT 12

NORTHING: 506327.1171

EASTING: 19357857.3378

CONTROL POINT 19

NORTHING: 506607.4868

EASTING: 19357810.0167

CONTROL POINT 8

NORTHING: 506455.1841

EASTING: 19357972.5722

CONTROL POINT 24

NORTHING: 506603.7264

EASTING: 19357992.2320

CONTROL POINT 11

NORTHING: 506237.4291

EASTING: 19358006.6029

CONTROL POINT 14

NORTHING: 506367.2199

EASTING: 19358235.3443

CONTROL POINT 26

NORTHING: 506373.8960

EASTING: 19358377.5267

CONTROL POINT 15

NORTHING: 506246.0848

EASTING: 19358382.9690

CONTROL POINT 1

NORTHING: 506321.7006

EASTING: 19358566.8134

CONTROL POINT 5

NORTHING: 505898.2894

EASTING: 19358217.3204

CONTROL POINT 16

NORTHING: 506143.2151

EASTING: 19358575.9175

CONTROL POINT 13

NORTHING: 505954.1614

EASTING: 19358519.7497

CONTROL POINT 2

NORTHING: 505984.9969

EASTING: 19358822.0585

CONTROL POINT 3

NORTHING: 506283.3604

EASTING: 19358832.6413

CONTROL POINT 7

NORTHING: 506106.5143

EASTING: 19359181.6171

NOTE: TREE CLEARING LIMITS CAN BE FOUND ON SHEET B-6.2

G B

G B

G B

G B

G B

G B

G B

G

B

BOARDMAN

IMPOUNDMENT

BROAD

RD

DIPLEY RD

BLAIR TWP.

GARFIELD TWP.

W I L

L I A

SHEET

AREA

R:

\P ro je ct s\

\C

AD

D\

PD

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D

ES

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HE

ET

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X

- B

RE

AC

HI

N

G

SH

EE

TS

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.2

SO

IL

E

RO

SI

O

N

S

ED

IM

EN

TA

TI

O N

C O

N

TR

O L

PL

AN

_2

6.

.0 5_

RE

V_

M

LC

.d w g M ay

3,

- 1 0:

am c ot em

00 50' 100'

TEMPORARY SPOILS

STORAGE

OVERHEAD SIGN

(TO BE REMOVED)

B - 1.2

SO

IL

ER

OS

IO

N

SE

DI

ME

NT

AT

IO

N

CO

NT

RO

L -

B

RE

AC

HI

NG

JS TR

N

BW DD

D.

D

EV

AU

N 3/3

/15

D

ES

IG

N

RE

VI

EW

WETLAND AREA

WETLAND AREA

WETLAND AREA

EQUIPMENT STAGING

AREA

TEMPORARY CONSTRUCTION

ENTRANCE (SEE DETAIL SE50)

POWERHOUSE

CONCRETE SPILLW

AY

CONSTRUCTION

ACCESS ROAD

SIPHON

PUMPING

PAD

SIPHON OUTLET

ENERGY

DISSIPATION

SPILLWAY

STILLING

BASIN

TAILWATER

BERM EL 623

(4) 36" HDPE

CULVERT EL 615

ARTICULATED

BLOCK

CHANNEL

TOP OF BANK

CHANNEL

ALIGNMENT

LEGEND

RIVER CHANNEL TOP

PAVEMENT BOUNDARY

EXISTING MAJOR

GUARDRAIL

OVERHEAD ELECTRIC

RIP RAP

OF BANK

GBGRADE BREAK LINE

PAVEMENT BOUNDARY

CONSTRUCTION

ACCESS / SIPHON PAD

CONTOUR LINE

EXISTING MINOR

CONTOUR LINE

CONSTRUCTION

ACCESS ROAD

CONSTRUCTION ACCESS ROAD

6/3 /15

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N

RE

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EW

EXISTING TREE LINE

TREE CLEARING

LIMITS REQUIRED AS

NECESSARY

PROPOSED TREE

CLEARING LIMITS

REQUIRED AS

NECESSARY

EXISTING TREE

LINE

CONCRETE

COREWALL

AUXILIARY

SPILLWAY

EXISTING

INTAKE

OLD CASS ROAD

BRIDGE

CULVERTS

TEMPORARY CONSTRUCTION

ENTRANCE (SEE DETAIL SE50)

SILT FENCE

(SEE DETAIL SE26)

SILT FENCE

(SEE DETAIL SE26)

SILT FENCING

SILT FENCE

(SEE DETAIL SE26)

SILT FENCE

(SEE DETAIL SE26)

SILT FENCE

(SEE DETAIL SE26)

8/2 1/1

0%

D

ES

IG

N

RE

VI

EW

SIPHON HDPE PIPES

GRAVEL ACCESS PAD

PUBLIC OBSERVATION

AREA

PUBLIC PARKING AREA

OBSERVATION AREA

TO BE QUARANTINED

FROM CONSTRUCTION

EQUIPMENT AND ACTIVITY

CONSTRUCTION

FENCING

PUBLIC PARKING

AREA

1. THE CONTRACTOR SHALL COMPLY WITH GRAND TRAVERSE COUNTY RULES &

REGULATIONS FOR SOIL EROSION CONTROL & SUBMIT A SCHEDULE OF SOIL EROSION

ACTIVITIES TO THE LOCAL ENFORCING AGENCY PRIOR TO ANY EARTH CHANGE AND

AFTER RECEIVING A NOTICE OF COVERAGE AND COMPLIANCE.

2. EROSION AND SEDIMENTATION CONTROL MEASURES SHALL BE CATEGORIZED AS INITIAL,

INTERIM, AND FINAL MEASURES. INITIAL MEASURES SHALL BE IMPLEMENTED PRIOR TO

ANY MAJOR SOIL DISTURNACE ON THE SITE, AND SHALL BE LOCATED AT AND ADJACENT

TO AREAS THAT WILL BE DISTURBED AT THE START OF CONSTRUCTION (TEMPORARY

ACCESS ROADS, ACCESS ROAD ENTRANCE/EXIT POINTS FROM THE SITE, DOWNLOPE OF

THE EXCAVATIONS AT THE DAM, STILLING BASINS AND OUTLETS). INTERIM MEASURES

SHALL BE APPLIED TO AREAS THAT WILL BE DISTURVED AS CONSTRUCTION PTOGRESSES

(DOWNSLOPE OF SPOIL DISPOSAL AREAS, STOCKPILE PERIMETERS). FINAL MEASURES

SHALL BE APPLIED UPON COMPPLETION OF CONSTRUCTION, AND MAY CONSIST OF

MAINTENENACE AND UPGRADES OF PREVIOUSLY PLACED INITIAL OR INTERIM

MEASURES.

EROSION CONTROL NOTES

3. ALL INITIAL SOIL EROSION AND SEDIMENT CONTROL PRACTICES ARE TO BE INSTALLED

PRIOR TO ANY MAJOR SOIL DISTURBANCE, AND IN THEIR PROPOER SEQUENCE, AND

MAINTAINED UNTIL PERMANENT PROTECTION IS ESTABLISHED.

4. ANY DISTUBED AREAS THAT WILL BE LEFT EXPOSED MORE THAN 30 DAYS, AND NOT

SUBJECT TO CONSTRUCTION TRAFFIC, WILL IMMEDIATELY RECEIVE A TEMPORARY

SEEDING AS SPECIFIED IN SPECIFICATION SECTION 32 90 00. IF THE SEASON PREVENTS

THE ESTABLICHMENT OF TEMPORARY COVER, THE DISTURBED AREAS SHALL BE

MULCHED WITH STRAW, OR EQUIVALENT MATERIAL, AT A RATE OF 2 TO 2 ½ TONS PER

ACRE.

5. THE CONTRACTOR SHALL INSPECT ALL TEMPORARY & PERMANENT EROSION CONTROL

MEASURES WEEKLY & IMMEDIATELY (WITHIN 24 HOURS) AFTER A SIGNIFICANT

RAINFALL EVENT. ALL MEASURES REQUIRING MAINTENANCE REPAIR OR REPLACEMENT

SHALL BE CORRECTED IMMEDIATELY AT NO ADDITIONAL COST TO THE GOVERNMENT.

6. IF UNFORESEEN EROSION OR SEDIMENTATION PROBLEMS ARE IDENTIFIED; THE

CONTRACTOR SHALL TAKE IMMEDIATE MEASURES TO STABILISE THE AREA AND

CONTROL THE PROBLEM. THE CONTRACTOR SHALL ALSO NOTIFY THE COR. THE

CONTRACTOR SHALL IMPLEMENT ANY ADDITIONAL MEASURES REQUIRED BY THE COR.

LIMITS OF CASS

ROAD CONSTRUCITON

(SEE SHEETS C-0.1 - C-6.4)

/21

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7. ALL SUBGRADE SLOPES SHALL BE TRACKED PERPENDICULAR TO THE SLOPE TO AID IN

EROSION CONTROL OF SLOPED AREAS.

8. CONTRACTOR SHALL FENCE OFF AND PROTECT TREES/AREAS DESIGNATED BY COR.

9. THE LOCATION OF ANY STOCKPILES SHALL BE DESIGNATED BY THE COR PRIOR TO

CONSTRUCTION. THIS AREA SHALL BE ENCLOSED BY SILT FENCE A REASONABLE

DISTANCE FROM THE TOE OF SLOPE UNTIL SUCH TIME IT IS USED.

10. A CRUSHED STONE, STABILIZED CONSTRUCTION ACCESS PAD WILL BE INSTALLED

WHEREVER A CONSTRUCTION ACCESS ROAD INTERSECTS A PAVED ROADWAY. SAID

PAD WILL MEET THE REQUIREMENTS OF THE TEMPORARY CONSTRUCTION ENTRANCE

DETAIL ON SHEET B-1.4.

11. STREET SWEEPING AND DUST CONTROL SHALL BE THE CONTRACTOR'S RESPONSIBILITY.

12. ALL DRAINAGE DITCHES ARE TO BE STABILIZED WITH EROSION CONTROL BLANKET;

DRAINAGE DITCHES STEEPER THAN 3% ARE TO BE SODDED.

13. SLOPES STEEPER THAN 1V:6H (16%) LOCATED WITHIN THE DAM BREACHING AREA ARE

TO BE STABILIZED WITH EROSION CONTROL BLANKETS.

14. ALL WETLANDS NOT LOCATED WITHIN LIMITS OF DISTURBANCE SHALL BE PROTECTED

WITH SILT FENCE AND SHALL NOT BE DISTURBED.

15. CONCRETE RUBBLE MAY BE SALVAGED AND USED FOR TEMPORARY EROSION CONTROL,

BUT ALL METAL SHALL BE CUT FLUSH AND DISPOSED OF OFF-SITE.

16. FINAL SOIL EROSION CONTROL MEASURES, PLANTINGS & SEEDMIX FOR ALL SLOPES,

WETLANDS, OR DISTURBED LAND AREA SHALL BE COMPLETED WITHIN FIFTEEN (15)

CALENDAR DAYS AFTER FINAL GRADING OR FINAL EARTH CHANGE HAD BEEN

COMPLETED. SEEDING, COMPOST, MULCHING, AND FERTILIZER REQUIREMENTS AND

SPECIFICATIONS ARE PROVIDED IN SPECIFICATION SECTIONS 32 90 00.

17. AT COMPLETION OF CONSTRUCTION ACTIVITIES OR UPON REQUEST FOR REVIEW,

SUBMIT INSPECTION LOG BOOK TO THE COUNTY AND THE COR.

CLEAN INFILTRATION

BASIN UPON COMPLETION

OF PROJECT

PROTECT

PROTECT

SAFETY BUOY AND CABLE

(TO BE REMOVED)

LIMITS OF DISTURBANCE

BOARDMAN

IMPOUNDMENT

BROAD

RD

DIPLEY RD

BLAIR TWP.

GARFIELD TWP.

W I L

L I A

SHEET

AREA

R:

\P ro je ct s\

\C

AD

D\

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S\ Ri ve r R es to ra tio n\

D

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G

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AN

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00 50' 100'

B - 1.3

SO

IL

ER

OS

IO

N

SE

DI

ME

NT

AT

IO

N

CO

NT

RO

L -

C

AS

S

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BW DD

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WETLAND AREA

TEMPORARY CONSTRUCTION

ENTRANCE (SEE DETAIL SE50)

POWERHOUSE

CONCRETE SPILLW

AY

CHANNEL

TOP OF BANK

CHANNEL

ALIGNMENT

LEGEND

RIVER CHANNEL TOP

PAVEMENT BOUNDARY

EXISTING MAJOR

GUARDRAIL

OVERHEAD ELECTRIC

OF BANK

GBGRADE BREAK LINE

PAVEMENT BOUNDARY

CONSTRUCTION

ACCESS / SIPHON PAD

CONTOUR LINE

EXISTING MINOR

CONTOUR LINE

6/3 /15

D

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EW

EXISTING TREE LINE

PROPOSED TREE

CLEARING LIMITS

PROPOSED TREE

CLEARING LIMITS EXISTING TREE

LINE

EXISTING

OLD CASS ROAD

BRIDGE

CULVERTS

SILT FENCE

(SEE DETAIL SE26)

SILT FENCE

(SEE DETAIL SE26)

SILT FENCING

SILT FENCE

(SEE DETAIL SE26)

8/2 1/1

0%

D

ES

IG

N

RE

VI

EW

SIPHON HDPE PIPES

GRAVEL ACCESS PAD

PUBLIC PARKING AREA

PUBLIC PARKING

AREA

LIMITS OF CASS

ROAD CONSTRUCITON

(SEE SHEETS C-0.1 - C-6.4)

/23

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CLEAN INFILTRATION

BASIN UPON COMPLETION

OF PROJECT

LIMITS OF DISTURBANCE

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LEGEND

RIP RAP

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EASTING: 19358202.2887

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D

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VERTICAL FT OF THE FIBER OPTIC CABLE LINE.

NORTHING: 506052.9671

EASTING: 19358107.6165

NORTHING: 506014.3463

EASTING: 19358110.5099

NORTHING: 506017.4576

EASTING: 19358150.5560

NORTHING: 506056.1078

EASTING: 19358147.4132

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REFER TO SHEET B-3.3

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WSE = APPROX. 635' - 627'

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EXISTING CONCRETE

CORE WALL

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�ξ.]χ.∆&�Χ�9ϑΨ �ϑ∆χϑγΨ�=.∆�

DOWNSTREAM

TAILWATER

BERM REFER TO

SHEETS B-7.1 & B-7.4

6/ 3/1

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SI

GN

RE

VI

EW

].ς+ϑ∆�ς.ς�]

(4) 36" HDPE PIPES

REFER TO

SHEETS B-7.1 & B-7.4

SIPHON PIPES

AND INTAKE SCREENS

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8/

/15

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=.Χ.χ]�ϑ%��.]χγΨ��∆��

NOTE:

REFER TO SHEET B-3.2 FOR SPILLWAY DETAILS IN RELATION TO THE CONCRETE CORE WALL.

LIMITS OF DISTURBANCE

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MOORING BUOYS

SEE SHEET B-3.2

Know what's

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/23

/1

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SHEET

AREA

AUXILIARY SPILLWAY

STILLING BASIN BERM

TOP ELEVATION OF 622'

AUXILIARY SPILLWAY

STILLING BASIN BOTTOM

ELEVATION AT 615''

AUXILIARY SPILLWAY

STILLING BASIN BERM

TOP ELEVATION OF 621'

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