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PROJECT LOCATION MAP
PROJECT
LOCATION
SHT. NO. DESCRIPTION
1. TITLE AND INDEX SHEET
2. SITE PLAN
3. GENERAL DETAILS AND NOTES
4. BID ITEMS AND NOTES
North
TWIN LAKES
LAKE SINAI
215TH STREET
455T
H A
VE
NU
E
41
NH0081(00)112
PCN 03CU
21295-06
1
7
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5
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8
5
1790
1795
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8
0
0
1
7
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5
1760
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7
6
5
1770
1775
1780
1785
1790
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1760
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.9
8
50' EASEMENT
FLOWLINE
1730
1740
1750
1760
1770
1780
1790
1730
1740
1750
1760
1770
1780
1790
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00
1761.3
11+00
1761.0
1762.0
12+00
1762.7
1763.5
13+00
1763.2
1762.6
14+00
1762.2
1762.1
15+00
1761.8
1761.5
16+00
1761.2
1760.2
17+00
1759.1
1758.3
18+00
1758.0
1757.6
19+00
1756.8
1756.1
20+00
1755.4
1754.8
21+00
1753.9
1752.7
22+00
1751.7
1751.4
23+00 24+00 25+00 26+00 27+00
PARCEL T1
DON L. JOHNSON
SE1/4 OF SECTION 6-T109N-R52W,
BROOKINGS COUNTY, SOUTH DAKOTA.
1" = 250'
455T
H A
VE
NU
E
215TH STREET
SECTION LIN
E
SE
CT
IO
N LIN
E
33'
ROW
TWIN
LAKES
42
SE CORNER
SEC. 6-109-52
(FOUND 3/4" IRON PIN)
T1
NH0081(00)112
PCN03CU
T2
21295-06
T2A
STA. 0+00 TO 10+02
PROFILE PROJECTED OUT BASED
ON USGS CONTOUR DATA
STA. 22+65 TO 26+48
PROFILE PROJECTED OUT BASED
ON SINGLE SHOT NEAR STA. 26+48
STA. 10+02 - START OF
DETAILED SURVEY DATA
STA. 22+65 - END OF
DETAILED SURVEY DATA
STA. 12+52
HIGH POINT = 1763.60
1/4 LIN
E
SE 1/4 SECTION 6-T109N-R52W
TARGET DEWATERING
EL. = 1756.0'
MIN. DEWATERING
EL. = 1758.8'
APPROX. WATER
EL. (8-16-11) = 1761.8'
PARCEL T2
ALLAN R NEGSTAD
JOANNE NEGSTAD
NEGSTAD'S SUBD. TRACT A IN E1/2 SW1/4 OF SECTION
6-T109N-R52W, BROOKINGS COUNTY, SOUTH DAKOTA.
PARCEL T2A
UNITED STATES OF AMERICA
PARCEL 2 OF SW1/4 OF SECTION 6-T109N-R52W,
BROOKINGS COUNTY, SOUTH DAKOTA.
43
NH0081(00)112
PCN 03CU
4
1
RIPRAP REQUIREMENTS (SDDOT CLASS)
12" TO 24" 8 TO 12 CY CL. A
27" TO 33" 14 TO 20 CY CL. A
36" TO 48" 23 TO 28 CY CL. A
54" AND UP 62 CY AND UP CL. B
(ONE CUBIC YARD IS APPROXIMATELY 2,800 LBS.)
NOTES;
1. RIPRAP MATERIAL & QUALITY SHALL BE IN
ACCORDANCE WITH SDDOT STANDARD
SPECIFICATIONS FOR .RIPRAP.
2. PROVIDE RIPRAP AT ALL STORMWATER &
DRAINAGE PIPE OUTLETS.
PLAN
5D
1
4
RIPRAP
2
'
2
'
B
A
D
SCALE: NONE
SECTIONA
SCALE: NONE
SECTIONB
RIPRAP
2'
12
"
RIPRAP
12
"
GEOTEXTILE FILTER FABRIC,
SDDOT TYPE B
GEOTEXTILE FILTER FABRIC,
SDDOT TYPE B
RIPRAP DETAIL
SCALE: NONE
21295-06
PROJECT: NH 0081(00)112, BROOKINGS COUNTY - PCN 03CU
EMERGENCY DRAWDOWN OF TWIN LAKES
WORK WILL INVOLVE DEWATERING THE LAKES AT AN APPROXIMATE SUSTAINED RATE OF 35 CUBIC FEET PER SECOND (MAXIMUM) FOR 90 TO 100 DAYS. WORK MAY BE INHIBITED DUE
TO WEATHER CONDITIONS OR OTHER CIRCUMSTANCES - THUS THE STANDBY TIME. CHANNEL/SADDLE MODIFICATION WILL NOT BE ALLOWED TO ACCOMPLISH THE WORK. THE
EXISTING CHANNEL/SADDLE IS TO REMAIN UNCHANGED.
1. CONTRACTOR SHALL PROVIDE MEANS AND METHOD FOR A SUSTAINED DRAWDOWN OF 35 CFS FROM TWIN LAKES. THIS FLOW RATE SHALL BE VERIFIED BY AN APPROVED
METHOD OF MEASUREMENT. THE FLOW SHALL BE MEASURED AND RECORDED TWICE WEEKLY, BY THE CONTRACTOR. THE PRELIMINARY ENGINEERING REPORT PRESENTED
ALTERNATIVES FOR THIS DRAWDOWN AND CAN BE EXAMINED AND DOWNLOADED FROM THE SOUTH DAKOTA DEPARTMENT OF TRANSPORTATION WEB SITE
HTTP://WWW.SDDOT.COM/PE/PROJDEV/PLANNING_PUBMEET_US81.ASP OR USE THE LINK ON THE HOME PAGE OF THE WEBSITE WWW.SDDOT.COM.
THE TOTAL FLOW WILL BE MONITORED BY DOT AT THE 4 - 48" CMP CULVERTS INSTALLED IN THE TOWNSHIP ROAD (455TH AVENUE). CONTRACTOR WILL BE RESPONSIBLE TO
INCREASE OR DECREASE THE SUSTAINED DRAWDOWN FLOW TO ACCOUNT FOR THE NATURAL FLOW THAT MAY OCCUR AT THE SADDLE DUE TO RAIN FALL EVENTS.
2. FISH SCREENING SHALL BE PROVIDED BY THE CONTRACTOR. SD GAME FISH AND PARKS STATED THAT THE GOAL IS TO PREVENT TRANSFER OF FISH FROM ONE LAKE TO THE
OTHER BY DOWNWARD MIGRATION OR UPWARD MIGRATION. PLACING A PIPE UNDER OVERSIZED ROCK IS AN ACCEPTABLE MEANS OF PREVENTING FISH FROM TRANSFERRING
FROM ONE LAKE TO THE OTHER AS LONG AS BOTH ENDS OF THE PIPE ARE THUS PROTECTED. THE DEPTH OF THE ROCK MUST BE GREAT ENOUGH TO CREATE A MATRIX THAT
THE FISH CANNOT NAVIGATE THROUGH AND GET CAUGHT IN THE FLOW. MECHANICAL SCREENS WOULD ALSO BE ALLOWED. THE SLOT SIZE SHALL BE EQUIVALENT TO A #40
SIEVE SIZE OR APPROXIMATELY 0.0165 INCHES OR 0.425 MM. SCREENS SHALL BE SIZED SO THAT THE TOTAL OPEN AREA ALLOWS FOR A MAXIMUM SLOT VELOCITY OF 0.5 FT PER
SEC. THE FISH SCREENING FACILITY PLANNED FOR THIS PROJECT MUST BE APPROVED BY SD DOT AND SD GAME FISH AND PARKS.
3. EROSION PROTECTION SHALL BE PROVIDED BY THE CONTRACTOR AT THE ENDS OF THE PIPE TO PREVENT A SCOUR HOLE AND EROSION OF SOIL PARTICLES.
4. THE WATER WITHDRAWAL SHALL END WHEN ANY OF THE FOLLOWING CRITERIA HAS BEEN MET:
A.THE TWIN LAKES WATER ELEVATION REACHES AN ELEVATION OF 1756.00 MEAN SEA LEVEL (NAVD88). THIS ELEVATION WILL BE MONITORED AND DOCUMENTED BY DOT AT
THE US HIGHWAY 81 MRM 113. AN ELEVATION ROD WILL BE SET IN PLACE AT THE EDGE OF THE SHOULDER.
B. WEATHER CONDITIONS CAUSE FREEZING IN THE DRAINAGE THAT RESTRICTS FLOW AND BACKS WATER UP IN THE CHANNEL. DOT WILL MONITOR AND IN MUTUAL
AGREEMENT WITH BROOKINGS COUNTY DETERMINE WHEN THE FLOW RESTRICTIONS IS GREAT ENOUGH TO REQUIRE THE OPERATIONS TO CEASE.
C.OPERATIONS WILL CEASE NO LATER THAN DECEMBER 16, 2011
5. THE WATER SURFACE ELEVATION OF LAKE SINAI WILL ALSO BE MEASURE BY DOT. DRAWDOWN OPERATION MAY BE PUT ON STANDBY IF LAKE SINAI WATER ELEVATIONS REACH
1747.5 (NAVD88). DRAWDOWN OPERATIONS WOULD RESUME WHEN LAKE SINAI WATER ELEVATION DROPS DOWN TO 1747.3 (NAVD88).
6. DOT WILL MONITOR THE RIVER STAGES USING THE USGS GAGING STATION #06480000. IF THE BIG SIOUX RIVER FLOWS INCREASE TO 1900 CFS THEN THE DRAWDOWN
OPERATIONS WILL TEMPORARILY CEASE UNTIL THE BIG SIOUX RIVER FLOWS HAVE DROPPED DOWN TO 1500 CFS.
7. SURFACE RESTORATION SHALL BE COMPLETED BY THE CONTRACTOR IN THE SPRING OF 2012. WORK SHALL INCLUDE THE RE-SEEDING OF THE CRP ACREAGE AS REQUIRED TO
RESTORE THE AREA TO THE EXISTING CONDITION PRIOR TO THIS PROJECT.
8. ALL WORK SHALL BE COMPLETED IN ACCORDANCE WITH THE BROOKING COUNTY TEMPORARY DRAINAGE PERMIT AND THE ATTACHED FINDINGS OF FACT, CORP OF ENGINEERS
404 PERMIT AND THE SD GAME FISH AND PARKS PERMIT.
44
NH0081(00)112
PCN 03CU
21295-06
