6-26-01_KOS872821A_Final Plans_10-30-25.pdf

PDF 4 MB Posted Apr 14, 2026

Attached to: KOS972821A (26-01)
Solicitation number: 009-RFB-WRBWL-CY26-01
Issued by: Jasper County, Alburnett City, Iowa

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Written by GovTribe AI · Apr 27, 2026

This is a set of final construction plans and specifications for Project KOS972821A, a constructed wetland for nutrient removal in Kossuth County, Iowa, developed in cooperation with the Iowa Department of Agriculture & Land Stewardship, United States Department of Agriculture, and United States Fish & Wildlife Service. The project encompasses approximately 17 acres of site development including selective clearing and grubbing of 0.8 acres of trees, excavation of approximately 6,962 cubic yards of material, placement of 1,595 to 1,627 cubic yards of general earthfill, installation of 1,444 square feet of steel sheet piling, installation of 515 linear feet of tile drainage systems (including 6-inch perforated CPP, 12-inch perforated HDPE dual-wall, and 12-inch non-perforated HDPE dual-wall conduits), construction of a 48-inch aluminum water control structure with 15-inch drawdown pipe (91 linear feet), placement of 548 tons of riprap with 108 cubic yards of concrete grout, topsoil placement of 1,771 cubic yards, structure seeding of 1 acre, and buffer seeding of 16 acres. The wetland design includes a 5.9-acre pool at normal water level elevation of 1,137.0 feet with maximum depth of 5.0 feet, three submerged berms, an auxiliary spillway, a sedimentation basin, and associated drainage infrastructure. The project is located in Section 21, Township 97N, Range 28W near Burt, Iowa, with construction required to commence within 14 days of the preconstruction meeting and substantial completion by December 31, 2026, with seeding deadlines of May 15, 2027 for structure seeding and June 30, 2027 for buffer seeding.

The final plans, prepared by Andrew Schippers, P.E. (Iowa License No. P26317, renewal date December 31, 2025) from Ducks Unlimited's Great Lakes/Atlantic Regional Office in Dexter, Michigan, incorporate revisions dated June 16, 2025 and final plans dated October 27, 2025. All work shall be completed in accordance with NRCS specifications adapted by IDALS and Ducks Unlimited, or the current edition of Iowa Statewide Urban Design and Specifications (SUDAS) where NRCS specifications are unavailable. The contractor is solely responsible for construction site safety and must notify Iowa One Call at (800) 292-8989 at least 48 hours prior to any excavation. All bid item materials require product data sheets approved by the Engineer, and cultural resources discovered during construction must be reported immediately to the Engineer and IDALS. The plans prohibit any activity that jeopardizes threatened or endangered species and establish a 660-foot buffer zone around existing eagle nests unless otherwise indicated by U.S. Fish and Wildlife Service guidelines. Tree removal for bat protection shall occur between October 1 and March 31, with trees 3 inches in diameter and larger cut 3 to 4 feet above ground line during this period.

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Other files

File	Type	Posted
3-26-01_Kos972821A_Proposal-Affidavit_Document_CC(UPLOAD).pdf	PDF	Apr 14, 2026
5-26-01_KOS972821A_Specifications_ 9-4-25-.PDF	PDF	Apr 14, 2026
1383988-event.pdf	PDF	Apr 14, 2026
11KOS972821A Wetland Inspection Plan - 7-3-25.pdf	PDF	Apr 14, 2026
7-26-01_Kos972821A_Appendix-I.pdf	PDF	Apr 14, 2026
1-26-01_Kos972821A_Wetland_General_Requirements.pdf	PDF	Apr 14, 2026
4-26-01_Kos972821A_BidBond_(UPLOAD).pdf	PDF	Apr 14, 2026
2-26-01_Kos972821A_Notice-to-Bidders.pdf	PDF	Apr 14, 2026
3-26-01_Kos972821A_Schdule-of-Prices_Document_CC (Worksheet).pdf	PDF	Apr 14, 2026

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310th ST

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PROJECT NO. KOS972821A

CONSTRUCTED WETLAND FOR NUTRIENT REMOVAL

KOSSUTH COUNTY

SECTION 21, TOWNSHIP 97N, RANGE 28W

IOWA

IN COOPERATION WITH

IOWA DEPARTMENT OF AGRICULTURE & LAND STEWARDSHIP,

UNITED STATES DEPARTMENT OF AGRICULTURE, &

UNITED STATES FISH & WILDLIFE SERVICE

IOWA ENGINEERING JOB CLASS V

PROJECT LOCATION

Know what's below.

Call before you dig.

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I hereby certify that this engineering document was prepared by me or under my direct personal supervision and that I am a duly licensed Professional Engineer under the laws of the State of Iowa.

To the best of my professional knowledge, judgement, and belief, these plans meet applicable NRCS Standards

Date

License No:

License renewal date:

Pages of sheets covered by this seal: 1 - 14 (C001 - C401)

December 31, 2025 P26317

Andrew Schippers, P.E.

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CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

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C001

10-27-25

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A.S.,A.B.

A.S., W.J., C.K.

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IA-340-15 COVER SHEET & SPECS

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US-IA-340-15

IOWA

MAP POINT " " IS LOCATED AT THE INTERSECTION OF WALNUT STREET

AND 1ST STREET IN BURT, IA. FROM MAP POINT, PROCEED EAST ON 300TH

STREET APPROX. 3.6 MILES TO INTERSECTION WITH 160TH AVE. THEN,

PROCEED NORTH ON 160TH AVE FOR APPROX. 0.7 MILES TO PROJECT SITE.

LATITUDE: 43°12'34.19"

LONGITUDE: 94°9'7.66"

BURT, IOWA

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UTILITIES NOTE:

BEFORE THE START OF CONSTRUCTION, THE OWNER OF

ANY UTILITIES INVOLVED MUST BE NOTIFIED. THE

EXCAVATOR/CONTRACTOR IS RESPONSIBLE FOR GIVING

THIS NOTICE BY CALLING "IOWA ONE CALL" AT (800) 292-8989

AT LEAST 48 HOURS PRIOR TO ANY EXCAVATION.

PROJECT LOCATION

Sheet List Table

Sheet Number Sheet Title

C001 COVER SHEET

C002 SPECIFICATIONS, QUANTITIES, & NOTES

C051 TOPOGRAPHY & EXISTING CONDITIONS

C101 SITE PLAN

C201 EMBANKMENT PLAN & PROFILE

C202 WETLAND PROFILES

C203 TILE #1 PLAN & PROFILE

C301 SHEET PILE DETAILS

C302 CONSTRUCTION DETAILS

C303 WCS DETAIL SHEET 1

C304 WCS DETAIL SHEET 2

C305 WCS DETAIL SHEET 3

C306 FILTER DIAPHRAGM DETAILS

TICKET #:

PROJECT LOCATION MAP

SCALE: 1" = 2000'

C401 SEEDING PLAN

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AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

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CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C002

10-27-25

T.P.

A.S.,A.B.

A.S., W.J., C.K.

A.S.

IA-340-15 COVER SHEET & SPECS

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ESTIMATED QUANTITIES

NOTE # BID ITEM # SPEC # DESCRIPTION QUANTITY UNIT

1 1 IA CS-001 SITE STRIPPING & PREPARATION LS 1.0

2 2 IA CS-001 CROP DAMAGE AC 0.0

3 3 IA CS-006 STRUCTURE SEEDING AC 1.0

4 4 IA CS-006 BUFFER SEEDING AC 16.0

5 5 CS-008 MOBILIZATION & DEMOBILIZATION LS 1.0

6 6 IA CS-009 DRAINAGE TILE INVESTIGATION LS 1.0

7 7 IA CS-013 STEEL SHEET PILING SF 1444.0

8 8 IA CS-021 EXCAVATION (GENERAL) CY-P 6,962.0

9 9 IA CS-023 EARTHFILL (GENERAL) CY-P 1,595.0

10 10 IA CS-023 EARTHFILL (GENERAL BERM) CY-P 1,627.0

11 11 IA CS-023 EARTHFILL (BERM CORE) CY-P 924.0

12 12 IA CS-024 DRAINFILL (SAND) TN 83.0

13 13 IA CS-024 FILTER DIAPHRAM LS 1.0

14 14 IA CS-026 TOPSOIL PLACEMENT CY-P 1,771.0

15 15 IA CS-046 TOE DRAIN (6"Ø PERF. CPP) LF 110.0

16 16 IA CS-046 12"Ø HDPE DUAL-WALL (PERFORATED) LF 232.0

17 17 IA CS-046 12"Ø HDPE DUAL-WALL (NON-PERF.) LF 173.0

18 18 IA CS-051 48"Ø ALUMINUM WATER CONTROL STRUCTURE (WCS) LS 1.0

19 19 IA CS-051 15"Ø ALUMINUM CMP DRAWDOWN PIPE LF 91.0

20 20 IA CS-046,

IA CS-081 STOPLOG STORAGE STRUCTURE LS 1.0

21 21 IA CS-051 CMP OUTLET - 15"Ø LF 20.0

22 22 IA CS-051 CMP OUTLET - 8"Ø LF 40.0

23 23 IA CS-061 RIPRAP (IA DOT CLASS E) TN 548.0

24 24 IA CS-062 CONCRETE GROUT CY 108.0

25 25 IA CS-051 36" ALUMINUM CMP RISER INLET LS 1.0

26 26 IA CS-011 DEWATERING LS 1.0

CONSTRUCTION NOTES:

1. BID ITEM FOR STRIPPING SHALL INCLUDE REMOVAL OF THE FIRST 12" OF TOPSOIL MATERIAL BELOW THE BERM, WETLAND

EXPANSION, SUBMERGED BERMS, AUXILIARY SPILLWAY, AND TILE COVER (ESTIMATED STRIPPING QUANTITY IS 2,711 C.Y.).

THE TOPSOIL MATERIAL SHALL BE STOCKPILED ON-SITE FOR RESPREAD, WHICH IS INCLUDED IN A SEPARATE BID ITEM.

WASTE MATERIAL SHALL BE DISPOSED OF ON-SITE AT DESIGNATED AREAS, DESCRIBED IN "BIDDING NOTES". THIS BID ITEMSHALL ALSO INCLUDE CLEARING & GRUBBING OF 0.8 ACRE PATCH OF TREES. CONTRACTOR SHALL REMOVE TREES FROM

SITE.

2. CROP DAMAGES WILL BE A PASS-THROUGH COST BY THE CONTRACTOR TO THE LANDOWNER. ENGINEER WILL MEASURE THIS AREA AND IDALS WILL AGREE WITH THE LANDOWNER ON A UNIT COST DURING CONSTRUCTION. BID ITEM FOR CROP DAMAGE SHALL INCLUDE AREA OF CROPS DAMAGED, AS NECESSARY, IN ORDER TO COMPLETE THE WORK AS DETAILED. CONTRACTOR

SHALL MINIMIZE CROP DAMAGE AS MUCH AS POSSIBLE DURING CONSTRUCTION ACTIVITIES.

3. BID ITEM FOR STRUCTURE SEEDING SHALL CONSIST OF SEEDING, MULCHING, AND FERTILIZING ALL STRUCTURES, EMBANKMENTS, AND ALL OTHER DISTURBED AREAS (OUTSIDE OF POOL AREA), AS INDICATED ON THE DRAWINGS OR OTHERWISE DESIGNATED. SEED MIX SHALL BE APPROVED BY ENGINEER AT LEAST 2 WEEKS BEFORE PLANNED SEEDING.

4. BID ITEM FOR BUFFER SEEDING SHALL CONSIST OF SEEDING THE AREAS DESIGNATED ON THE PLANS AS BUFFER SEEDING AND INCLUDE BORROW AREAS, DISTURBED AREAS NOT SEEDED AS PART OF STRUCTURAL SEEDING, AND OTHER AREAS WITHIN THE EASEMENT. SEED MIX SHALL BE APPROVED BY ENGINEER AT LEAST 2 WEEKS BEFORE PLANNED SEEDING.

5. BID ITEM FOR MOBILIZATION & DEMOBILIZATION SHALL INCLUDE THE SUPPLY OF ALL LABOR, MATERIAL AND EQUIPMENT TO TRANSPORT ALL NEEDED LABOR, MATERIAL AND EQUIPMENT, TO AND FROM THE PROJECT SITE, TO SUCCESSFULLY COMPLETE THE PROJECT AS SHOWN ON THE PLANS. ANY ADDITIONAL MOBILIZATION OF MANPOWER, EQUIPMENT, OR MATERIALS REQUIRED TO COMPLETE THE PROJECT SHALL BE PROVIDED BY THE CONTRACTOR AT NO ADDITIONAL EXPENSE. ANY AND ALL WORK NEEDED TO PROVIDE ACCESS TO THE SITE TO COMPLETE CONSTRUCTION ACTIVITIES SHALL BE INCLUDED WITHIN THIS BID ITEM. THIS WORK SHALL ALSO INCLUDE RESTORATION OF THE ACCESS ROUTES UPON CONSTRUCTION COMPLETION.

6. BID ITEM FOR DRAINAGE TILE INVESTIGATION SHALL CONSIST OF INVESTIGATION, LOCATION, REPAIR, REMOVAL AND/OR CAPPING/PLUGGING OF SUBSURFACE DRAINS (TILE) IN WETLAND RESTORATION AREA, ENHANCEMENT, OR CREATION PROJECT AREAS, OR OTHER SITUATIONS WHERE SUBSURFACE DRAINS MAY BE PRESENT. THIS BID ITEM DOES NOT INCLUDE INSTALLATION OF NEW TILE, WHICH IS INCLUDED IN SEPARATE LINE ITEMS. CONTRACTOR SHALL LOOK FOR EVIDENCE OF TILE DURING EXCAVATION OF THE CORE TRENCH, AS WELL AS DURING EXCAVATION OF THE POOL AREAS. ANY TILE FOUND SHALL BE PLUGGED TO ENSURE THEY ARE NON-FUNCTIONAL, IN ACCORDANCE WITH THE PROJECT SPECIFICATIONS.

7. BID ITEM FOR STEEL SHEET PILING SHALL CONSIST OF FURNISHING AND DRIVING THE SPECIFIED SHEET PILING AT THE LOCATION SHOWN ON THE DRAWINGS. THIS BID ITEM SHALL INCLUDE SHEET PILING CAP AND ALL OTHER LABOR AND MATERIALS NECESSARY TO PROVIDE A COMPLETE INSTALLATION. SHOP DRAWINGS SHALL BE REQUIRED FOR SHEET PILE

STRUCTURE.

8. BID ITEM FOR EXCAVATION (GENERAL) SHALL CONSIST OF EXCAVATION AND GRADING OF MATERIAL FOR THE BERM CORE TRENCH, SEDIMENTATION BASIN, AND WETLAND EXPANSION AREAS BEYOND THE INTIAL 12" OF TOPSOIL STRIPPING.

EARTHWORK QUANTITIES ASSUME 50% OF GENERAL EXCAVATION MATERIAL CAN BE UTILIZED FOR GENERAL EARTHFILL, WHILE THE REMAINING 50% CAN BE UTILIZED AS TOPSOIL/SPOIL. CONTRACTOR SHALL ANTICIPATE 50% OF THE WETLAND EXPANSION AREAS TO BE OVER EXCAVATED BY 6" AND RECEIVE A MINIMUM OF 6" LAYER OF TOPSOIL.

9. BID ITEM FOR EARTHFILL (GENERAL) SHALL CONSIST OF THE EARTHFILL NECESSARY TO CONSTRUCT THE SUBMERGED BERMS, AUXILIARY SPILLWAY, AND TILE COVER. COHESIVE MATERIAL FOUND DURING GENERAL EXCAVATION CAN BE USED FOR

THESE AREAS. SAND AND GRAVEL FOUND ON SITE SHALL NOT BE USED FOR THIS EARTHFILL.

10. BID ITEM FOR EARTHFILL (GENERAL BERM) SHALL CONSIST OF EXCAVATING, PLACING, AND COMPACTING EARTHFILL NECESSARY TO CONSTRUCT THE PORTION OF THE EMBANKMENT THAT IS NOT CONSIDERED PART OF THE EMBANKMENT CORE.

COHESIVE MATERIAL FOUND DURING GENERAL EXCAVATION CAN BE USED FOR THIS AREA. SAND AND GRAVEL FOUND ON

SITE SHALL NOT BE USED FOR FILL FOR THIS ITEM.

11. BID ITEM FOR EARTHFILL (BERM CORE) SHALL CONSIST OF EXCAVATING, PLACING, AND COMPACTING EARTHFILL NECESSARY TO CONSTRUCT THE PORTION OF THE EMBANKMENT DESIGNATED AS THE EMBANKEMENT CORE, INCLUDING THE CORE TRENCH. COHESIVE MATERIAL TAKEN FROM THE DESIGNATED BORROW AREA SHOULD BE USED FOR THIS AREA (NEAR CONTRACTOR ACCESS/STAGING AREA, OR OTHER AS APPROVED BY ENGINEER). ESTIMATED PLAN VALUE INCLUDES 25%

SHRINKAGE FACTOR.

12. BID ITEM FOR DRAINFILL (SAND) SHALL CONSIST OF FURNISHING AND PLACING DRAINFILL REQUIRED IN THE CONSTRUCTION OF STRUCTURE DRAINAGE SYSTEMS AND FILTER DIAPHRAGMS AROUND CONDUITS. THIS ITEM WILL CONSIST OF THE EXCAVATION NECESSARY TO CONSTRUCT THE TOE DRAINS, INCLUDING BACKFILL WITH MATERIAL MEETING THE REQUIREMENTS OF FINE DRAINFILL. GRADATIONS SHALL BE PROVIDED TO ENGINEER PRIOR TO ARRIVING ON-SITE.

13. BID ITEM FOR FILTER DIAPHRAGM SHALL CONSIST OF FURNISHING AND PLACING ALL MATERIAL REQUIRED IN THE CONSTRUCTION OF FILTER DIAPHRAGM AROUND CONDUITS. THIS ITEM WILL CONSIST OF THE EXCAVATION NECESSARY TO CONSTRUCT THE FILTER, INCLUDING BACKFILLING WITH FILTER GRAVEL, (51 TON, THIS MATERIAL IS INCLUDED IN BID ITEM

12) OF IA DOT GRADATION 1 SAND MEETING 4110, AND (4 TON) OF IA DOT GRADATION 6 - 3/8" CHIP.

14. BID ITEM FOR TOPSOIL PLACEMENT SHALL CONSIST OF SPREADING SALVAGED AND STOCKPILED TOPSOIL AS THE SURFACE LAYER OF ALL EXCAVATIONS AND EARTHFILLS THAT WILL BE SEEDED. TOPSOIL SHALL BE PLACED AS THE FINAL LIFT. AREAS TO RECEIVE A MINIMUM OF 6" LAYER OF TOPSOIL INCLUDE AREAS OF THE EMBANKMENT THAT DO NOT HAVE RIPRAP, BORROW AREA, AND ADDITIONAL FILL PLACED OVER NEW TILE. 6" THICK TOPSOIL SHALL BE RE-SPREAD OVER THE EXCAVATED AREAS WITHIN THE POOL & CHANNEL. CONTRACTOR SHALL ANTICIPATE 50% OF THE WETLAND EXPANSION AREAS TO BE OVER

EXCAVATED BY 6" AND RECEIVE A MINIMUM OF 6" LAYER OF TOPSOIL.

15. BID ITEM FOR TOE DRAIN (6"Ø PERFORATED CPP) SHALL CONSIST OF FURNISHING AND INSTALLING 6-INCH PERFORATED CORRUGATED POLYETHYLENE TUBING (SINGLE WALL) USED AS A DRAIN TILE FOR THE TOE DRAIN AS SHOWN ON THE DRAWINGS. SAND BACKFILL AROUND THE TILE SHALL BE PAID UNDER A SEPARATE BID ITEM. 20' LENGTHS OF 8"Ø GALVANIZED CMP SHALL BE UTILIZED AT THE EXPOSED OUTLETS OF THE TOE DRAIN TILE (TWO LOCATIONS). THE METAL

OUTLET SHALL BE PAID UNDER A SEPARATE BID ITEM.

16. BID ITEM FOR 12"Ø HDPE DUAL-WALL (PERFORATED) SHALL CONSIST OF FURNISHING AND INSTALLING 12-INCH, PERFORATED, HDPE, DUAL-WALL CORRUGATED POLYETHYLENE TUBING USED AS A DRAIN TILE AS SHOWN ON THE DRAWINGS.

MEASUREMENT AND PAYMENT FOR 12-INCH PERFORATED DUAL-WALL POLYETHYLENE TUBING SHALL BE ON AN INSTALLED

LINEAR FOOT BASIS, AND SHALL INCLUDE ALL NECESSARY FITTINGS AND ADAPTERS.

17. BID ITEM FOR 12"Ø HDPE DUAL-WALL SHALL CONSIST OF FURNISHING AND INSTALLING 12-INCH, NON-PERFORATED, HDPE, DUAL-WALL CORRUGATED POLYETHYLENE TUBING USED AS A DRAIN TILE AS SHOWN ON THE DRAWINGS. MEASUREMENT AND PAYMENT FOR 12-INCH NON-PERFORATED DUAL-WALL POLYETHYLENE TUBING SHALL BE ON AN INSTALLED LINEAR FOOT BASIS, AND SHALL INCLUDE ALL NECESSARY FITTINGS AND ADAPTERS. - A 20' LENGTH OF 15"Ø GALVANIZED CMP SHALL BE UTILIZED AT THE EXPOSED DOWNSTREAM OUTLET OF THE TILE (ONE LOCATION). THE METAL OUTLET SHALL BE PAID UNDER A

SEPARATE BID ITEM (SEE NOTE 21).

18. BID ITEM FOR ALUMINUM WATER CONTROL STRUCTURE SHALL CONSIST OF PROVIDING AND INSTALLING THE ALUMINUM DRAW DOWN STRUCTURE, STOP LOGS, AND CONCRETE BASE AS SHOWN ON THE DRAWINGS AND DETAIL SHEETS. THE WCS SHALL BE FROM WISCONSIN FLOWGATE, OR APPROVED EQUAL. SHOP DRAWINGS SHALL BE APPROVED BY ENGINEER PRIOR

TO FABRICATION.

19. BID ITEM FOR ALUMINUM CMP DRAWDOWN PIPE SHALL CONSIST OF PROVIDING AND INSTALLING THE 15-INCH DIAMETER ACP

INLET AND OUTLET PIPES AS SHOWN ON THE DRAWINGS.

20. THE BID ITEM FOR STOPLOG STORAGE BOX SHALL INCLUDE ALL LABOR AND MATERIALS TO PROVIDE THE STOPLOG STORAGE BOX, AS DETAILED IN THE PLANS. EXACT LOCATION SHALL BE DETERMINED IN THE FIELD WITH APPROVAL FROM ENGINEER.

21. BID ITEM FOR CMP OUTLET - 15"Ø SHALL CONSIST OF FURNISHING AND INSTALLING THE 15"Ø CMP AND FITTINGS SHOWN ON THE PLANS FOR TILE OUTLETS, INCLUDING ANIMAL GUARD AT OUTLET END OF PIPE (SEE NOTE 17).

22. BID ITEM FOR CMP OUTLET - 8"Ø SHALL CONSIST OF FURNISHING AND INSTALLING THE 8"Ø CMP AND FITTINGS SHOWN ON THE PLANS FOR TILE OUTLETS, INCLUDING ANIMAL GUARD AT OUTLET END OF PIPE (SEE NOTE 15)

23. BID ITEM FOR RIPRAP (IA DOT CLASS E) SHALL CONSIST OF FURNISHING AND PLACING THE ROCK RIPRAP IN THE LOCATIONS AS SHOWN ON THE DRAWINGS. ROCK SHALL BE CLASS E REVETMENT STONE AS DEFINED BY IOWA DEPARTMENT OF TRANSPORTATION. NON-WOVEN FILTER FABRIC IS REQUIRED BENEATH ALL ROCK/RIPRAP AND SHALL BE SECURED TO SLOPES AND BOTTOM, USING PINS, AS NOTED IN THE SPECIFICATIONS. QUANTITY IS BASED ON TONS. CONTRACTOR SHALL PROVIDE SCALE TICKETS WITH WEIGHTS INCLUDING TARE WEIGHTS, GROSS WEIGHTS, AND NET WEIGHTS OF MATERIAL DELIVERED.

CONTRACTOR SHALL PROVIDE GRADATIONS TO ENGINEER PRIOR TO RIPRAP ARRIVING ON-SITE.

24. BID ITEM FOR CONCRETE GROUT SHALL CONSIST OF FURNISHING AND PLACING CONCRETE GROUT ON THOSE PORTIONS OF THE RIPRAP SHOWN ON THE DRAWINGS. GROUT FILL QUANTITY IS BASED ON AN APPLICATION RATE OF 0.6FT3/FT2 OF RIPRAP.

WHITE PIGMENTED CURE SHALL BE APPLIED AND IS INCIDENTAL TO THIS BID ITEM.

25. BID ITEM FOR 36"Ø ALUMINUM CMP RISER INLET SHALL CONSIST OF PROVIDING AND INSTALLING THE 36-INCH DIAMETER CMP RISER IN WETLAND, AS SHOWN ON THE DRAWINGS. SHOP DRAWINGS SHALL BE APPROVED BY ENGINEER PRIOR TO

FABRICATION.

26. BID ITEM FOR DEWATERING SHALL INCLUDE ALL MATERIAL, EQUIPMENT, AND LABOR REQUIRED TO PROVIDE DEWATERING AND WATER MAINTENANCE FOR THE DURATION OF THE PROJECT. THIS SHALL INCLUDE BUT IS NOT LIMITED TO EXCAVATING DRAINAGE CHANNELS/SUMPED AREAS, PROVIDING PUMPING OPERATIONS, AND CREATING WATER DIVERSIONS AS

NECESSARY TO COMPLETE THE PROJECT/WORK.

NRCS SPECIFICATIONS:

IA CS-001 SITE PREPARATION

IA CS-005 POLLUTION CONTROL

IA CS-006 SEEDING AND MULCHING FOR PROTECTIVE COVER

CS-008 MOBILIZATION & DEMOBILIZATION

IA CS-009 SUBSURFACE DRAIN INVESTIGATION, REMOVAL, AND REPAIR

IA CS-011 REMOVAL OF WATER

IA CS-013 SHEET PILING

IA CS-021 EXCAVATION

IA CS-023 EARTHFILL

IA CS-024 DRAINFILL (SAND)

IA CS-026 TOPSOILING

IA CS-031 CONCRETE

IA CS-046 TILE DRAINS FOR LAND DRAINAGE

IA CS-051 CORRUGATED METAL PIPE CONDUITS

IA CS-061 LOOSE ROCK RIPRAP

IA CS-062 CONCRETE GROUT FOR RIPRAP

IA CS-081 METAL FABRICATION AND INSTALLATION

IA CS-095 GEOTEXTILE

ADDITIONAL NOTES:

1. THE PROJECT SPECIFICATIONS ARE FROM NRCS FOR THE STATE OF IOWA ADAPTED BY IDALS/DU.

2. ALL APPLICABLE FEDERAL, STATE, AND LOCAL LAWS AND ORDINANCES WILL BE COMPLIED WITH IN

THE CONSTRUCTION OF THIS PROJECT.

3. USDA, IDALS, AND DU DO NOT GUARANTEE THE WETLAND WILL FILL OR REMAIN FILLED WITH WATER

TO THE PRINCIPAL CREST ELEVATION.

4. IF CULTURAL RESOURCE IS IDENTIFIED DURING CONSTRUCTION, STOP IMMEDIATELY AND NOTIFY

ENGINEER AND IDALS.

5. PRODUCT DATA SHEETS SHALL BE PROVIDED FOR ALL BID ITEM MATERIALS, AS WELL AS ANY OTHER

MATERIALS, AS REQUESTED BY THE ENGINEER.

6. NO ACTIVITY WILL BE AUTHORIZED WHICH JEOPARDIZES THE CONTINUED EXISTENCE OF A

THREATENED OR ENDANGERED SPECIES OR A SPECIES PROPOSED FOR SUCH DESIGNATION, AS

INDENTIFIED UNDER THE FEDERAL ENDANGERED SPECIES ACT, OR WILL DESTROY OR ADVERSELY MODIFY THE CRITCIAL HABITAT OF SUCH A SPECIES. THE ENGINEER WILL CONSULT WITH A QUALIFIED

BIOLOGIST IF SUCH A SITUATION IS BELIEVED TO EXIST ONSITE AND A COURSE OF ACTION

DETERMINED. EXISTING EAGLE NESTS WILL BE PROVIDED WITH A 660' BUFFER ZONE UNLESS

OTHERWISE INDICATED BY THE NATIONAL BALD EAGLE MANAGEMENT GUIDELINES PUBLISHED BY THE US FISH AND WILDLIFE SERVICE MAY 2007. NOTE, THE PRIMARY NESTING SEASON IS MAY 15

THROUGH AUGUST 1.

7. TO PROTECT THREATEND/ENDANGERED BATS, TREES SHALL BE REMOVED IN ACCORDANCE WITH IOWA DOT ARTICLE 2101.10 BETWEEN OCTOBER 1ST AND MARCH 31ST. TREE FELLING IN THAT TIME WILL ONLY REQUIRE TREES 3" IN DIAMETER AND LARGER TO BE CUT 3 TO 4 FEET ABOVE GROUND LINE. THE CONTRACTOR SHALL LIMIT REMOVAL OF FOREST COVER TO THOSE AREAS WHICH ARE NECESSARY FOR

THE CONSTRUCTION OF THE WORK AND AS DIRECTED BY THE ENGINEER.

8. IF SAND IS FOUND DURING EXCAVATION THE ENGINEER MUST BE NOTIFIED IMMEDIATELY TO DETERMINE NECESSARY REMEDIATION ACTIONS. WORK IN THE AREA WHERE SAND IS IDENTIFIED

SHALL BE POSTPONED UNTIL A COURSE OF ACTION CAN BE DETERMINED.

9. ALL WORK SHALL BE COMPLETED PER NRCS SPECIFICATIONS. IF REQUIRED WORK IS NOT INCLUDED IN NRCS SPECIFICATIONS, WORK SHALL CONFORM TO THE CURRENT EDITION OF THE IOWA STATEWIDE

URBAN DESIGN AND SPECIFICATIONS (SUDAS).

10. THE VOLUMES AND QUANTITIES AS PROVIDED ARE ESTIMATED FROM TOPOGRAPHIC INFORMATION, ACQUIRED FROM MULTIPLE SOURCES, USING A COMPUTER PROGRAM. PAYMENT WILL BE MADE BASED ON PLAN QUANTITIES UNLESS OTHERWISE NOTED OR ADDITIONAL EXCAVATION IS DIRECTED BY THE

ENGINEER. EXCAVATION RESULTING FROM THE CONTRACTOR'S IMPROPER CONSTRUCTION

OPERATIONS, SITE CONDITIONS, OR OTHERWISE, WILL NOT BE INCLUDED FOR MEASUREMENT AND

PAYMENT.

BIDDING NOTES:

1. BORROW EXCAVATION: 3,111 C.Y. (INCIDENTAL TO BID ITEM NO. 8, NO. 9, NO. 10 & NO. 11)

(REFERENCE IA CS-021 & IA CS-023)

2. FILL BORROW PIT WITH EXCESS TOPSOIL: 3,111 C.Y. (INCIDENTAL TO BID ITEM NO. 1)

(REFERENCE IA CS-001 3.0 STRIPPED MATERIAL DISPOSAL)

3. PLACE SPOIL: 4,847 C.Y. (INCIDENTAL TO BID ITEM NO. 1, NO. 8, NO. 9, NO. 10 & NO. 11.)

(REFERENCE IA CS-001 3.0 STRIPPED MATERIAL DISPOSAL, IA CS-021 & IA CS-023)

TP4

TP3

TP1

TP2

5'x7' RCB CULVERT INVERT 1123.13

14'x6' RCB CULVERT

INVERT 1123.13

14'x6' RCB CULVERT

INVERT 1123.13

18"Ø CMP CULVERT INVERT 1149.00

18"Ø CMP CULVERT INVERT 1148.59

24"Ø CMP CULVERT INVERT 1148.72

24"Ø CMP CULVERT INVERT 1149.28

8"Ø CPP SURFACE INTAKE RIM 1148.53

18"Ø CMP TILE INVERT

1145.44 (AT INTAKE)

18"Ø CMP TILE INVERT 1144.03

6"Ø CPP TILE OUTLET

INVERT 1142.25

4"Ø PVC PIPE TOP 1142.12

(PIPE CROSSES DITCH)

4"Ø PVC PIPE TOP 1140.81

(PIPE CROSSES DITCH)

7"Ø CPP TILE MEASURE

FURTHER UP BANK; TOP 1141.76

7"Ø CPP TILE OUTLET

INVERT 1138.8 (BURIED)

PARCEL BOUNDARY

PARCEL BOUNDARY (TYP.)

1153 11 51 1150 11

10"Ø CLAY TILE INVERT 1137.13 (WEST)

12"Ø HDPE TILE INVERT 1137.02 (EAST)

18"Ø CMP TILE OUTLET INVERT 1136.73

310th ST

0t h A V E

5t h

EXISTING C/L DITCH

10"Ø CLAY TILE INVERT 1141.20

10"Ø CLAY TILE INVERT 1140.53

10"Ø CLAY TILE INVERT 1138.03

TEST PIT #1

TEST PIT #2

TEST PIT #3

TEST PIT #4

CP 1

SET CAPPED REBAR (OPUS)

N:3903065.94 E: 4745022.08

ELEV: 1161.17 (NAVD88)

CP 1 DESTROYED ON 12/19/2024

CP 2

SET CAPPED REBAR (OPUS)

N: 3905563.66 E: 4747066.39

ELEV: 1143.64 (NAVD88)

CP 3

SET CAPPED REBAR (OPUS)

N: 3903936.58 E: 4748365.27

ELEV: 1149.06 (NAVD88)

US-IA-340-15, MANSKE

HORIZONTAL CONTROL

Coordinates are NAD 83 (CORS 2011), Iowa State Plane North Zone 1401, and units of measurement are in U.S. Survey Feet. Raw data was collected for 11 hours, 58 minutes on June 14, 2023 using a Trimble R12 GPS base receiver. Coordinates are established using an autonomous survey and post processed with the NGS OPUS (National Geodetic Survey, Online Positioning User Service) solution for the occupied control point 1.

VERTICAL CONTROL

Elevations established from an autonomous survey and post processed with the NGS OPUS solution for the occupied control point number 1. Vertical Datum was observed in NAVD 88, using GEOID18.

ONSITE CONTROL, HORIZONTAL AND VERTICAL

Control Point 1 - Set capped rebar N: 3903065.941 E: 4745022.081

Z: 1161.166 NAVD88

CONTROL POINT 1 - SET CAPPED REBAR

DESTROYED ON 12/19/2024 DURING TILE INVESTIGATION.

CONTROL POINT DATA

POINT #

ELEVATION

1161.166

1143.643

1149.058

NORTH

3903065.941

3905563.660

3903936.577

EAST

4745022.081

4747066.391

4748365.266

DESCRIPTION

DESTROYED

SET CAPPED REBAR

N O

T F

O R

C O

N S

T R

U C

GRAPHIC SCALE

1 inch = feet200

200 0 100 200 400 800

USFWS USFWS

USFWS

LINDA MANSKE

GARY HUBER

RICHARD REISING

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CAD FILE:

DRAWN BY:

SURVEYED BY:

BIOLOGIST:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C051

9-3-2025

T.P.

A.S.,A.B.

A.S., W.J., C.K.

A.S.

IA-340-15 TOPO

K O

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US-IA-340-15

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SURVEY TIMELINE:

1. TOPOGRAPHIC SURVEY - JUNE 14, 2023

2. TILE INVESTIGATION & TEST PITS - NOVEMBER 21, 2023

3. TILE INVESTIGATION - DECEMBER 19, 2024

AutoCAD SHX Text

TEST PIT SOIL DATA

AutoCAD SHX Text

LOCATION

AutoCAD SHX Text

TP #1

AutoCAD SHX Text

TP #2

AutoCAD SHX Text

TP #3

AutoCAD SHX Text

TP #4

AutoCAD SHX Text

TOP

AutoCAD SHX Text

TOPSOIL

AutoCAD SHX Text

TOPSOIL

AutoCAD SHX Text

TOPSOIL

AutoCAD SHX Text

TOPSOIL

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1127.82-1131.35

AutoCAD SHX Text 1137.09-1140.18

AutoCAD SHX Text 1150.44-1152.00

AutoCAD SHX Text 1147.88-1150.00

AutoCAD SHX Text

BOTTOM

AutoCAD SHX Text

GLACIAL TILL

AutoCAD SHX Text

RED/BROWN CLAY

AutoCAD SHX Text

BROWN/TAN CLAY

AutoCAD SHX Text

GLACIAL TILL

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1123.35-1127.82

AutoCAD SHX Text 1132.09-1137.09

AutoCAD SHX Text 1144.03-1150.44

1148.00-1147.88

1150 11

2+08

100-YEAR STORM

ELEV. 1141.09

FLO

FLOW

0+00

1+00

2+00

3+00

4+00

6+00

7+00

8+00

9+00

+00

12+00

13+00

14+00

15+00

00 17

0+ 00 1+

00 2+ 00 3+

00 4+ 00 4+

TILE MODIFICATION #1

PROPOSED 12"Ø

HDPE DUAL WALL

OUTLET ELEV. 1138.0'

CLEAR AND GRUB TREES

APPROX. 0.80 ACRE

(TREES TO BE REMOVED FROM

SITE BY CONTRACTOR)

EASEMENT BOUNDARY

15' X 30'

SEDIMENTATION BASIN

BOTTOM ELEV. 1134.0'

W/ 3:1 SIDE SLOPES

48"Ø ACP WATER

CONTROL STRUCTURE

PROPOSED TOP OF BERM ELEV. = 1142.20

62' WIDE SHEET PILE WEIR ELEV. = 1137.00

13' x 58' STILLING BASIN AT ELEV. = 1133.00

PROPOSED 20' WIDE x 125' LONG

AUXILLARY SPILLWAY

8:1 UPSTREAM/DOWNSTREAM

SLOPES & 10:1 SIDE SLOPES TO

EXISTING GRADE

CREST ELEV. = 1140.40

PARCEL BOUNDARY

EASEMENT & PARCEL

BOUNDARY

PARCEL BOUNDARY

SUBMERGED BERM 3

TOP ELEV. = 1136.50

10' WIDE TOP WITH 3:1 SIDE SLOPES

SUBMERGED BERM 2

TOP ELEV. = 1136.50

10' WIDE TOP WITH 3:1 SIDE SLOPES

CHANNEL GRADING DOWNSTREAM

OF STILLING BASIN TO MERGE

INTO EXISTING GRADE/CHANNEL

SITE ACCESS

WETLAND PROFILE #2

WETLAND PROFILE #1

CONTRACTOR

STAGING AREA

PRIMARY BORROW AREA

PRIMARY SPOIL AREA

FILL BORROW AND BUILD UP HILLTOP

MATCH SLOPES TO EXISTING GRADE

SUBMERGED BERM 1

TOP ELEV. = 1136.50

10' WIDE TOP WITH 3:1 SIDE SLOPES

NWL 5.9 ACRES

ELEV. = 1137.00

EXCAVATE NEW POOL

BOTTOM ELEV. = 1136.50

3:1 SIDE SLOPES

SECONDARY BORROW AREA:

CONTRACTOR MAY OBTAIN BORROW

MATERIAL, IF NEEDED, FROM WETLAND POOL

EXPANSION AREA, AS APPROVED BY ENGINEER

EXCAVATE NEW POOL

BOTTOM ELEV. = 1136.50

3:1 SIDE SLOPES

EXCAVATE NEW POOL

BOTTOM ELEV. = 1136.50

3:1 SIDE SLOPES

EXCAVATE CHANNEL

ELEV. = 1136.0

3:1 SIDE SLOPES

12' WIDE BOTTOM

WETLAND PROFILE #1 PRIMARY SPOIL AREA

FILL BORROW AND BUILD UP HILLTOP

MATCH SLOPES TO EXISTING GRADE

PRIMARY SPOIL AREA: 12' WIDE BY 205' LONG

PLACE SPOIL TO ELEVATION 1142.5'

BLEND SIDE SLOPES TO MATCH EXISTING GRADE

(APPROX. 30 C.Y.)

WETLAND POOL CHARACTERISTICS

WETLAND

POOL

DEPTH

ELEV.

INCREMENTAL

AREA (AC)

CUMULATIVE

VOLUME

(ACRE-FT)

0.0 1131.0 0.000 0.000

1.0 1132.0 0.044 0.022

2.0 1133.0 0.218 0.153

3.0 1134.0 0.807 0.665

4.0 1135.0 1.409 1.774

5.0 1136.0 2.426 3.691

6.0 1137.0 5.934 7.871

7.0 1138.0 6.266 13.971

8.0 1139.0 6.732 20.470

9.0 1140.0 8.007 27.839

10.0 1141.0 10.393 37.039

11.0 1142.0 13.068 48.770

11.2 1142.2 13.546 51.431

N O

T F

O R

C O

N S

T R

U C

GRAPHIC SCALE

1 inch = feet100

100 0 50 100 200 400

LEGEND

APPROXIMATE PROPERTY LINE

PROPOSED DIKE

PROPOSED CHANNEL/DITCH

PROPOSED MAJOR CONTOUR

PROPOSED MINOR CONTOUR

PROPOSED PIPE

(000)

PROPOSED WATER CONTROL

STRUCTURE

PROPOSED TEST PIT

PROPOSED FULL SERVICE LEVEL (FSL)

PROPOSED SPOIL AREA

PROPOSED BORROW AREA

PROPOSED RIPRAP

0.00 PROPOSED SPOT ELEVATION

DESIGN CRITERIA

DESIGN CRITERIA VALUE UNIT REQUIREMENT/

NOTES

CONTRIBUTING SURFACE WATERSHED AREA 1152.99 ACRES

CONTRIBUTING SUBSURFACE WATERSHED AREA 1152.99 ACRES

POOL NORMAL WATER LEVEL (NWL) ELEVATION 1137.0 FT.

DESIGNED WETLAND POOL AREA (@ NWL) 5.9 ACRES

PERCENT POOL AREA TO WATERSHED AREA 0.51 % >=0.50%

MAX. POOL DEPTH 5.0 FT.

AVG. POOL DEPTH 1.33 FT.

DEEP WATER AREA (DEPTH >3 FT) 0.807 ACRES <25%

PERCENT DEEP WATER TO POOL AREA 13.7 %

POOL STORAGE VOLUME AT NWL 7.87 ACRE-FT

BERM ELEVATION 1142.2 FT.

POOL STORAGE VOLUME AT TOP OF BERM 51.431 ACRE-FT

MAX BERM HEIGHT 11.2 FT.

AVG. BERM HEIGHT 4.1 FT. TO E.G.

BERM LENGTH 254 FT.

PRINCIPLE WEIR ELEVATION 1137.0 FT.

PRINCIPLE WEIR LENGTH 62 FT.

AUXILIARY SPILLWAY ELEVATION 1140.4 FT.

AREA OF BUFFER 14.41 ACRES

RATIO BUFFER AREA TO NWL POOL AREA 2.4 : 1 RATIO

10-YEAR STORM HWL IN POOL 1139.72 FT.

10-YEAR PEAK INFLOW 992.04 CFS

10-YEAR PEAK OUTFLOW 974.94 CFS

25-YEAR STORM HWL IN POOL 1140.34 FT.

25-YEAR PEAK INFLOW 1367.37 CFS

25-YEAR PEAK OUTFLOW 1343.37 CFS

100-YEAR STORM HWL IN POOL 1141.09 FT.

100-YEAR PEAK INFLOW 2075.29 CFS

100-YEAR PEAK OUTFLOW 2055.65 CFS

FEMA 100-YEAR FLOOD ELEVATION (NAVD88) 1141.14 FT. VARIES

TP1

EXCAVATION NOTE:

IF SANDY MATERIAL IS FOUND DURING EXCAVATION, THE

ENGINEER MUST BE NOTIFIED IMMEDIATELY TO DETERMINE

NECESSARY REMEDIATION ACTIONS. WORK IN THE AREA

WHERE SAND IS IDENTIFIED SHALL BE POSTPONED UNTIL

A COURSE OF ACTION CAN BE DETERMINED.

NOTE:

STRIP 12"-36" TOPSOIL BEFORE OBTAINING BORROW

MATERIAL, BORROW AREA TO BE EXCAVATED TO APPROX.

5' DEPTH AFTER TOPSOIL REMOVAL. TOPSOIL TO BE

PLACED BACK INTO EXCAVATED AREA, SPREAD OUT AT

COMPLETION, AND BROUGHT BACK TO EXISTING GRADES.

N O

C E:

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N S

U C

O N

E S A

S T

H E

S O

N S

Y O

E C O

A C

D U

C K S U

S H

N O

T A S S U

M E

A N

Y R

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H E

S A

E W

O R K P

R M

R S O

N S E

N G

A G

N T

H E

W O

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R B Y

U C

R O

F O

S O

N S O

N -S

M A

L, D

A N

D I

R M

O N

I S T

H E

O F

D U

C K S U

I T

M A Y

N O

T B E

U S

O R R

R O

D U

F O

R A

N Y

S E

H O

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C O

N S

T O

F A N

A U

T O

F D

U C K S U

D U

C K S U

M A K

N O

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A R R A N

F A N

Y K

D R

A R D

T H

L, D

A N

D I

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B U

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O T

T O

E A C C U

R A C Y

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M A

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R A

N Y

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H A T

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C K S U

O T

O R T

R U

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O F

M A

L, D

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D I

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O R T

H E

S T

S A

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O F

F O

R A

N Y

R S O

U N

S S T

A R E

A C

N G

U N

T H

E D

N O

F A L

P R O

S S

N A L

A R C H

T, L

A N

D S C A

A R C H

T O

R L

A N

D S

U R V

O R

A N

M I

N A

N Y

W A Y.

I F

A N

M B

G T

H E

M P

O F

A L

P R O

S S

N A L

E A

G E

N G

A R C H

T, L

A N

D S C A

A R C H

T O

R L

A N

D S

U R V

O R S

H A

M P

D O

C U

T A N

D I

N C

D E

N O

O N

B Y"

F O

B Y

R S

R E, T H

E D

O F

S U

C H

O N

A N

D A

C R

N O

E A

O N

AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

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A N

C R

N A L

M A N

B O

V A R D

B U

A N

3-w w w .d uc ks

.o rg

U se rs \a sc hi pp er s\ D uc ks

U nl im ite d In co rp or at ed \I ow a

D oc um en ts

\I ow a\

_C 3D

P ro je ct s\

-3

-2 C

P R O

\K O

S S U

A N

S K E

3D _D

R A W

\I A -3

-1

A N

.d w g, 0/

A M

A nd re w

S ch ip pe rs

A N

N on e

CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C101

10-27-25

T.P.

A.S.,A.B.

A.S., W.J., C.K.

A.S.

IA-340-15 SITE PLAN

K O

A K O

S S U

O U

A N

US-IA-340-15

-2

A R Y

A N

A .S

-2

A N

A .S

-2 7-

N A L

A N

-2 7-

N A L

A N

S A .S

-2

A .S

A R Y

A N

-2

A N

A .S

PROPOSED EXCAVATION AREA

2+08

0+00

1+00

2+00

20'

10' WIDE WAVE SHELF

13' X 58' GROUTED

RIPRAP STILLING BASIN

BTM ELEV = 1133.00

62' WIDE SHEET PILE

WEIR CREST AT

ELEV. = 1137.00'

15" ACP OUTLET

INV. ELEV. = 1132.00

100-YEAR STORM

ELEV. = 1141.09

20' WIDE X 125' LONG

AUXILIARY SPILLWAY

8:1 UPSTREAM/DOWNSTREAM

SLOPES & 10:1 SIDE SLOPES TO

EXISTING GRADE

CREST ELEV. = 1140.40

NWL 5.9 ACRES

ELEV. = 1137.00

CHANNEL GRADING DOWNSTREAM

OF STILLING BASIN TO MERGE

INTO EXISTING GRADE/CHANNEL

8:1

SUBMERGED BERM 3

TOP ELEV. = 1136.50

10' WIDE TOP WITH 3:1 SIDE SLOPES

2:1

FLO

100-YEAR STORM

ELEV. = 1141.09

PARCEL & EASEMENT BOUNDARY

PARCEL BOUNDARY

0+00

15" A

CP @

0.00%

10' X 10' GROUTED

RIPRAP WCS OUTLET

STILLING BASIN

3:1 SIDE SLOPES

BOTOM ELEV = 1131.00

0+00.00

36"Ø ACP SLOTTED INTAKE

RISER WITH MOUNDED RIPRAP;

RIM ELEV. = 1137.00

15" ACP INV. ELEV. = 1132.00

FILTER DIAPHRAGM

NOTE:

BERM SHALL BE OVERBUILT BY 5% SO THAT

THE SETTLED TOP OF BERM WILL BE 1142.2'

NOTE:

WHITE PIGMENTED CURE REQUIRED

ON ALL GROUTED RIPRAP.

TOE DRAIN, 6"Ø

PERFORATED CPP

INV. ELEV. = 1136.20

TOE DRAIN, 6"Ø

PERFORATED CPP

INV. ELEV. = 1136.20

TOE DRAIN, 6"Ø

PERFORATED CPP

INV. ELEV. = 1136.00

48"Ø ACP WCS 1

RIM ELEV. = 1143.0

15" ACP INV. ELEV. = 1132.00

(INLET & OUTLET PIPE)

PROPOSED TOP OF

BERM = 1142.20,

12' WIDE TOP WITH

3:1 SIDE SLOPES

.0 0%

TOE DRAIN, 6"Ø

PERFORATED CPP

INV. ELEV. = 1136.00

NWL 5.9 ACRES

ELEV. = 1137.00

0+00

0+50

1+00

1+50

2+00

2+50

3+00

3+06

PROPOSED TOP OF BERM

ELEV. = 1142.20

EXISTING GRADE

TOP OF SHEET PILE SIDEWALL

ELEV. = 1141.20

62.00' WEIR CREST

WEIR CREST ELEV. = 1137.00

STILLING BASIN DOWNSTREAM

SIDE BOTTOM ELEV. = 1133.00

0.00% 0.00%

PROPOSED TOP OF BERM

ELEV. = 1142.20

2:1 SLO

PE 2:

CLAY CORE

4' DEPTH MIN.

STA = 0+37.58

ELEV = 1141.26

CLAY CORE

4' DEPTH MIN.

STA = 2+57.59

ELEV = 1141.16

0+00

0+50

1+00

1+50

2+00

2+08

AUXILIARY SPILLWAY

ELEV. = 1140.40

EXISTING GRADE

125.00' LONG SPILLWAY CREST

10:1 SLOPE

0.00%

R O

N O

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O R

C O

N S

T R

U C

EMBANKMENT & SPILLWAY PLAN

EMBANKMENT PROFILE

AUXILIARY SPILLWAY PROFILE

VERTICAL SCALE

1 inch = feet

HORIZONTAL SCALE

1 inch = feet

5 102.5

20 4010

GRAPHIC SCALE

1 inch = feet20

20 0 10 20 30 60

N O

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P R O

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A N

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P R O

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U R V

O R S

H A

M P

D O

C U

T A N

D I

N C

D E

N O

O N

B Y"

F O

B Y

R S

R E, T H

E D

O F

S U

C H

O N

A N

D A

C R

N O

E A

O N

AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

G R

A N

C R

N A L

M A N

B O

V A R D

B U

A N

3-w w w .d uc ks

.o rg

U se rs \a sc hi pp er s\ D uc ks

U nl im ite d In co rp or at ed \I ow a

D oc um en ts

\I ow a\

_C 3D

P ro je ct s\

-3

-2 C

P R O

\K O

S S U

A N

S K E

3D _D

R A W

\I A -3

-1

A N

.d w g, 0/

A M

A nd re w

S ch ip pe rs

B A N

K M

A N

R O

N on e

CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C201

10-27-25

T.P.

A.S.,A.B.

A.S., W.J., C.K.

A.S.

IA-340-15 SITE PLAN

K O

A K O

S S U

O U

B A N

K M

A N

R O

US-IA-340-15

-2

A R Y

A N

A .S

-2

A N

A .S

-2 7-

N A L

A N

-2

A .S

-2

A .S

-2

A .S

A L

A N

A R Y

A N

0 1 20 1

0+00

0+50

1+00

1+50

2+00

2+50

3+00

3+50

4+00

4+50

5+00

5+50

6+00

6+50

7+00

7+50

8+00

8+50

9+00

9+50

10+00

10+50

11+00

11+50

12+00

12+50

13+00

13+50

14+00

14+50

15+00

15+50

16+00

16+50

17+00

17+31

SUBMERGED BERM #2

TOP ELEV. 1136.5'

SUBMERGED BERM #3

TOP ELEV. 1136.5'

SUBMERGED BERM #1

TOP ELEV. 1136.5'

NWL ELEV. 1137.0' PROPOSED BERM AT WEIR

CREST ELEV. 1137.0'

GROUTED RIPRAP

STILLING BASIN

ELEV. 1133.0'

GRADE WETLAND

CHANNEL TO 1136.0

EXISTING GRADE

SILT BASIN

BOTTOM 1134.0

TIE INTO EXISTING

CHANNEL AT 10:1 SLOPE

0+00

0+50

1+00

1+50

2+00

2+50

.4 3+00

3+50

4+00

4+50

4+75

EXISTING GRADE

GRADE WETLAND

BOTTOM TO 1136.5'

3:1 MAX. SLOPE

NWL ELEV. 1137.0'

GRADE WETLAND

BOTTOM TO 1136.5'

WETLAND PROFILE #1 - ALONG FLOW PATH

5:1 VERTICAL EXAGGERATION

SCALE: 1" = 50'

N O

T F

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C O

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T R

U C

WETLAND PROFILE #2 - ACROSS GRADING AREA

5:1 VERTICAL EXAGGERATION

SCALE: 1" = 20'

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O R K P

R M

R S O

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U S E

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O T

O R T

R U

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M A

L, D

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D I

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O R T

H E

S T

S A

O N

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F O

R A

N Y

R S O

U N

S S T

A R E

A C

N G

U N

T H

E D

N O

F A L

P R O

S S

N A L

A R C H

T, L

A N

D S C A

A R C H

T O

R L

A N

D S

U R V

O R

A N

M I

N A

N Y

W A Y.

I F

A N

M B

G T

H E

M P

O F

A L

P R O

S S

N A L

E A

G E

N G

A R C H

T, L

A N

D S C A

A R C H

T O

R L

A N

D S

U R V

O R S

H A

M P

D O

C U

T A N

D I

N C

D E

N O

O N

B Y"

F O

B Y

R S

R E, T H

E D

O F

S U

C H

O N

A N

D A

C R

N O

E A

O N

AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

G R

A N

C R

N A L

M A N

B O

V A R D

B U

A N

3-w w w .d uc ks

.o rg

U se rs \a sc hi pp er s\ D uc ks

U nl im ite d In co rp or at ed \I ow a

D oc um en ts

\I ow a\

_C 3D

P ro je ct s\

-3

-2 C

P R O

\K O

S S U

A N

S K E

3D _D

R A W

\I A -3

-1

A N

.d w g, 0/

A M

A nd re w

S ch ip pe rs

D P

R O

N on e

CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C202

10-27-25

T.P.

A.S.,A.B.

A.S., W.J., C.K.

A.S.

IA-340-15 SITE PLAN

K O

A K O

S S U

O U

D P

R O

US-IA-340-15

-2

A R Y

A N

A .S

-2

A N

A .S

-2 7-

N A L

A N

0 1 2

-2 7-

N A L

A N

A .S

-2

A .S

A R Y

A N

-2

A N

A .S

EXISTING 10"Ø CLAY TILE

100-YEAR STORM

ELEV. 1141.09

100-YEAR STORM

ELEV. 1141.09

EXISTING 10"Ø CLAY TILE

INV. ELEV. = 1138.03'

EXISTING 10"Ø CLAY TILE

INV. ELEV. = 1140.53'

EXISTING 12"Ø HDPE TILE

232 LF

- 12"Ø HDPE DUAL W

ALL P

ERFORATED @ 0.31%

173 LF - 12"Ø HDPE DUAL WALL @ 0.31%

FLO

FLOW

EXISTING 10"Ø CLAY TILE

INV. ELEV. = 1141.20'

EXISTING 18"Ø CMP TILE OUTLET

INV. ELEV. = 1136.73'

RICHARD REISINGGARY HUBER

PROPOSED 12"Ø HDPE DUAL WALL PIPE OUTLET.

LAST 20' OF PIPE TO BE 15" CMP WITH RODENT GUARD.

OUTLET INV. ELEV. = 1138.00'

PROVIDE 6' x 8' RIPRAP STILLING BASIN AT OUTLET.

PROPOSED TIE-IN LOCATION

FOR 12"Ø HDPE DUAL WALL PERFORATED

PIPE WITH EXISTING 10"Ø CLAY TILE.

INV. ELEV. = 1139.26'

PROPOSED 12"Ø HDPE

DUAL WALL PERFORATED

10° PIPE DEFLECTION

INV. ELEV. = 1138.71'

TRANSITION FROM 12"Ø

HDPE DUAL WALL

PERFORATED

TO 12"Ø HDPE DUAL WALL

NON-PERFORATED AT

PROPERTY LINE

CLEAR AND GRUB TREES

APPROX. 0.80 ACRE

EXISTING 10"Ø CLAY TILE

PROPOSED TILE COVER

(3' MIN. COVER OVER TILE)

NOTE: TILE #1 MODIFICATION USES BOTH

PERFORATED AND NON-PERFORATED PIPE

0+00

0+50

1+00

1+50

2+00

2+50

3+00

3+50

4+00

4+50

5+00

TILE COVER

(3' MIN. COVER OVER TILE)

EXISTING GRADE

3:1 SLOPE

0.00%

EXISTING 10"Ø CLAY TILE

EXISTING 12"Ø HDPE TILE

EXISTING 18"Ø CMP TILE

12"Ø HDPE INTERCEPT

STA: 4+11.25

INV. ELEV. = 1139.26'

12"Ø HDPE DW PERFORATED DEFLECTION

STA: 2+27.48

INV. ELEV. = 1138.71'

15"Ø CMP OUTLET

STA: 0+00

INV. ELEV. = 1138.00'

232 LF - 12"Ø HDPE DUAL WALL PERFORATED @ 0.31% 173 LF - 12"Ø HDPE DUAL WALL @ 0.31%

TRANSITION FROM 12"Ø HDPE

DUAL WALL PERFORATED

TO 12"Ø HDPE DUAL WALL

AT PROPERTY LINE

STA: 1+71.06

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PLAN - 12"Ø HDPE DUAL WALL PIPE

PROFILE - 12"Ø HDPE DUAL WALL PIPE

VERTICAL SCALE

1 inch = feet

HORIZONTAL SCALE

1 inch = feet

5 102.5

30 6015

GRAPHIC SCALE

1 inch = feet30

30 0 15 30 60 120

CONCRETE COLLAR

MAR MAC DISSIMILAR

PIPE COUPLER

TILE

TYPICAL TILE CONNECTION DETAIL

NOT TO SCALE

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AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

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CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C203

10-27-25

T.P.

A.S.,A.B.

A.S., W.J., C.K.

A.S.

IA-340-15 SITE PLAN

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US-IA-340-15

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A R Y

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0+50

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BERM

5' WIDE GROUTED RIPRAP

SHEET PILE WEIR

ELEVATION 1137.0'

SHEET PILE DEPTH

ELEVATION 1123.0'

GROUTED RIPRAP

FLOW

GROUTED RIPRAP

STILLING BASIN OUTLET

ELEVATION 1135.0'

GROUTED RIPRAP

STILLING BASIN

ELEVATION 1133.0'

1 1/2"

PILE CAP SECTION VIEW

NOT TO SCALE

SHEET PILE CAP

FABRICATION DETAIL

NOT TO SCALE

NOTE:

ALL WELDS AT OR BELOW ELEV. 1137.0'

SHALL BE CONTINUOUS, WATERTIGHT, AND

SUBJECT TO LAMPING TO ENSURE

WATERTIGHT SEAL.

L5"X5"X3 8"

PL 10"X3

UNIFORM WIDTH

ALONG ENTIRE

WALL LENGTH

SHEET PILE MINIMUM DESIGN CRITERIA:

1. TYPE: SCZ

2. SECTION MODULUS: 2.0 IN3/FT.

3. THICKNESS: 0.209 IN

4. MOMENT OF INERTIA: 3.3 IN4/FT.

5. STEEL GRADE: 50 KSI

NOTE:

CAP WIDTH VARIES DEPENDING ON ALIGNMENT OF

SHEET PILE WALL. HOWEVER, ONCE THE

APPROPRIATE WIDTH IS DETERMINED, IT SHALL

REMAIN UNIFORM ALONG ENTIRE LENGTH OF WALL

WELD ANGLES TO

FACE OF SHEET PILE

AT CONTACT EDGES

WHERE POSSIBLE

PL 10"X3

L5"X5"X3 8"

WELD OVERLAP SHALL

BE A MINIMUM OF 11

PAST EDGE OF ANGLE

SHEET

PILE

WELD ANGLE TO SHEET

PILE AT CONTACT EDGES

WELD PL 10"X3

8" TO

L5"X5"X3

8" WITH 6"

BEAD AT 18" C-C (12"

BETWEEN WELDS)

L5"X5"X3 8"

GAP BETWEEN ANGLES

TO BE FILLED WITH

WELD OF 38" PLATE AT

INTERSECTION WITH

SHEET PILE TO ENSURE

WATERTIGHT SEAL.

NOTE: SHOPS DRAWINGS ARE REQUIRED.

RECOMMENDED SHEET PILE:

1. TYPE: SCZ 21N (OR APPROVED EQUAL)

2. SECTION MODULUS: 21.43 IN3/FT.

3. THICKNESS: 0.375 IN

4. STEEL GRADE: 50 KSI

5. DETAILS BASED ON 28.5" WIDE SHEETS

114.00'

62.00' 8.40'

3.35'

8.00' 9.60'

3.35'

8.40'8.00'9.60'

2:12:1

114.00'

62.00' 8.40'

3.35'

8.00' 9.60'

3.35'

8.40'8.00'9.60'

2:12:1

TOP SHEETING

ELEV. 1141.2'

BTM SHEETING

ELEV. 1132.2'

BTM SHEETING

ELEV. 1127.2'

BTM SHEETING

ELEV. 1123.0'

TOP SHEETING

ELEV. 1141.2'

BTM SHEETING

ELEV. 1132.2'

BTM SHEETING

ELEV. 1127.2'

BTM SHEETING

ELEV. 1123.0'

SHEET PILE WEIR

ELEVATION 1141.2' BERM ELEVATION 1142.2'

EXISTING

GRADE

EXISTING

GRADE

GROUTED RIPRAP

STILLING BASIN

ELEVATION 1133.0'

GROUTED RIPRAP

ELEVATION 1136.9'

(GROUT SHOULD BE 0.1'

BELOW TOP OF WEIR)

SHEET PILE WEIR

ELEVATION 1137.0'

SHEET PILE WEIR

ELEVATION 1137.0'

SHEET PILE WEIR

ELEVATION 1141.2'

1.5' THICK IA DOT CLASS E

RIPRAP OVER GEOTEXTILE FABRIC

(GROUTED FOR PORTION)

1.5' THICK IA DOT CLASS E

RIPRAP OVER GEOTEXTILE FABRIC

(GROUTED FOR PORTION)

BERM ELEVATION 1142.2'

N O

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N…

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File details come from the government source that posted it. Updated Apr 27, 2026.