Division of Soil Conservation and Water Quality

Cover Sheet

To: All plan holders From: Tracy Bruun, Division

Pages: Phone: 515-344-6279

Re: Cal883432B Nutrient Reduction Wetland (Bid 26-08) Date: August 21, 2026

Comments: Page

• Cover Sheet 1

• Addendum No. 1 with Attachments 1, 2 and 3 2-75

• Pre-Bid Meeting Minutes 76-79

• Pre-Bid meeting attendance list/Updated plan holders list 80

• Electronic files for grading can be obtained by e-mail by contacting Spencer Pech with ISG Inc at 563-920-5758 or spencer.pech@isginc.com.

- END OF COVER PAGE -

August 21, 2026

Division of Soil Conservation and Water Quality 1305 E Walnut Street Des Moines, IA 50319

TO: Prospective Bidders

Subject: Addendum No. 1 to Bid Documents CAL883432B Nutrient Reductionl Wetland Project – Bid No. 26-8 Calhoun County, Iowa

This addendum forms a part of the bidding contract documents and modifies the original bidding documents posted July 31, 2026. An updated bidding form, Document CC.– Proposal and Schedule of Prices is attached with the addendum acknowledged. This updated bidding form must be used for 26-8 and all bidders must acknowledge this addendum on Page CC-2. FAILURE TO DO SO WILL SUBJECT BIDDER TO DISQUALIFICATON.

Description:

DOCUMENT CC– PROPOSAL AND SCHEDULE OF PRICES, 26-8 (See Attachment No.1)

Please use the updated Document CC, to acknowledge Addendum No. 1 (See Attachment No. 1):

Plans (See Attachment No. 2) Bid Item #25 “Silt fence” has been added; details of the Water Control Structure and CMP slotted riser installation have been modified; clarification of the easement boundary and total easement area are included and the material of the drawdown pipe has been revised to include dual wall HDPE. Attached are the revised set of Plans.

Specifications (See Attachment No. 3)

The Technical Specifications booklet has also been revised to include the revisions noted in the plans, including the addition of Bid Item #25 “Silt fence” to Specifications IA CS-005 “Pollution Control” and details of the sign installation to be provided by IDALS. Attached are the revised set of Technical Specifications.

Sincerely, Sara Smith, P.E.

Water Resources Bureau

Attachment No. 1 – Updated Document CC Attachment No. 2 – Revised set of Plans Attachment No. 3 – Revised set of Technical Specifications

End of Addendum No. 1

CAL883432B Nutrient Reduction Wetland Project DOCUMENT CC – Attachment 1 Bid No. 26-8 PROPOSAL AND SCHEDULE OF PRICES

Time and Date for Bid Submissions: 3:00 PM, 08/26/2026

BIDDER LOGIN –

https://solutions.sciquest.com/apps/Router/SupplierLogin?CustOrg=DASIowa

Time and Date of Bid Opening: 3:00 PM, August 26, 2026

Bid Opening TEAMS: +1 469-998-7627,,352050218#

Project Description and Location: Cal883432B Nutrient Reduction Wetland Project Section 32, Township 88 North, Range 34 West Calhoun County, Iowa

PROPOSAL AND SCHEDULE OF PRICES

Proposal of (PRINT Name of Bidder: COMPANY & CONTACT)

Located at (FULL Address)

(Telephone Number)

Amount of

Proposal Guarantee

Description of Work Specified Completion Date Liquidated Damages

10% of Base Bid

All Work Except Seeding

June 15, 2027

$175.00 Per Day

Seeding - Buffer Seeding – Structure

06/30/2027 09/15/2027

$125.00 Per Day

Seeding must be done within the respective seeding period

The undersigned hereby agrees, if awarded the contract, to execute the proposed contract and to furnish satisfactory Performance Bond in an amount not less than one hundred percent (100%) of the contract award within fourteen (14) days from the date when Notice-of-Award is received, and to provide all supervision, labor, materials, and equipment required to complete the project designated above, for the prices hereinafter set forth, in strict compliance with the Contract Documents prepared by the Division.

Further, the parties agree and acknowledge as follows:

The amount of loss or damages likely to be incurred by Division are uncertain and said loss is incapable or very difficult to quantify and estimate;

The amount specified for liquidated damages herein bear a reasonable relationship to, and are not plainly or grossly disproportionate to, the probable loss likely to be incurred by Division in connection with any delay on part of the Contractor;

The amount of liquidated damages fixed herein bears a reasonable relationship to Division’s anticipated losses and/or actual losses;

The amount of liquidated damages herein fairly approximates Division’s loss at the time of making of this Agreement;

The amount of liquidated damages fixed herein are fair and reasonable and it approximates to the extent possible the actual loss to Division as a result of any delay on the part of Contractor; and

Division and Contractor are sophisticated parties and negotiated this Agreement at arm’s length.

Now therefore, in consideration of the mutual obligations set forth herein, the receipt and sufficiency of which is hereby acknowledged, the parties agree as follows:

Contractor will commence the work after the Preconstruction Conference and by the Construction Start Date approved by Division in the Construction Progress Schedule.

Contractor will complete the work within the specified time period identified in the contract, or as amended, or be responsible for liquidated damages per day as set forth in the above table.

The liquidated damages may be withheld from payments made to the Contractor by the Division upon written notice that liquidated damages have begun to accrue, and such damages are in addition to other remedies available as provided for in this contract and applicable law.

A Proposal Guarantee in the amount stipulated herein is included with this proposal, to be forfeited to the Division, if the undersigned fails or refuses to execute the contract and furnish satisfactory Performance Bond, if awarded the contract.

By _______________________________________________ (Signed)

(PRINT NAME)

(Title) (Date)

In executing this proposal, Bidder acknowledges receipt of Addendum Number _____ dated ____________________

In executing this proposal, Bidder acknowledges receipt of Addendum Number _____ dated ____________________

In executing this proposal, Bidder acknowledges receipt of Addendum Number _____ dated ____________________

08/21/20261

THE FOLLOWING AFFIDAVIT MUST BE COMPLETED AND NOTARIZED, OR THIS BID WILL BE REJECTED

AFFIDAVIT

The signatory, being duly sworn, does depose and say that the undersigned is an authorized representative of:

(Name of Firm)

Located at ____________________________________________________________________________________ hereinafter referred to as “Bidder” and does hereby affirm to have personal knowledge that said Bidder has thoroughly examined the Contract Documents, carefully prepared the Proposal and Schedule of Prices form, and has checked the same in detail before submitting; and that said Bidder, or the agents, officers, or employees thereof, have not, either directly or indirectly, entered into any agreement, participated in any collusion or fraud, or otherwise taken any action in restraint of free competitive bidding in connection with this bid.

(Signed)

(PRINT name)

Subscribed and sworn to before me this _________ day of ________________________________, 20____

(Signed, Notary)

My Commission Expires _______________, 20______

Must include notary stamp

SCHEDULE OF PRICES

Cal883432B Project Contract No. 26-08 Section 32, Township 88 North, Range 34 West, Calhoun County, Iowa

Name of Bidder:

IMPACS

Item No.

Eng's Item No. Work or Material Spec No. Est Qty Unit

Unit Price Total

1.1 1 Site Stripping and Preparation (Wetland) IA-CS-001 1 LS

1.2 2 Site Stripping and Preparation (Wasting) IA-CS-001 1 LS

1.2 3 Crop Damage IA-CS-001 0 AC

1.3 4 Structure, waterway & channel seeding IA-CS-006 1 AC

1.4 5 Buffer Seeding IA-CS-006 3 AC

1.5 6 Temporary Seeding IA-CS-006 1 AC

1.6 7 Mobilzation & Demobilization CS-008 1 LS

1.7 8 Drain Tile Investigation IA-CS-009 2 HR

1.8 9 Connecting to Existing Tile IA-CS-009 1 EA

1.9 10 Cap Existing Tile IA-CS-009 1 EA

1.10 11 Excavation (General) IA-CS-021 4,269 CY

1.11 12 Earthfill (General) IA-CS-023 2,551 CY

1.12 13 Earthfill (Wasting) IA-CS-023 1,889 CY

1.13 14 Drainfill IA-CS-024 18 TN

1.14 15 Topsoil Placement IA-CS-026 5,174 CY

1.15 16 Tied Concrete Block Mat IA-CS-031 2,750 SF

1.16 17 Water Control Structure Assembly IA-CS-045 1 EA

1.17 18 Trench Drain IA-CS-046 1 EA

1.18 19 Corrugated Polyethylene Pipe (Non-perforated) IA-CS-046

1.18 19A 12-inch Diameter IA-CS-046 581 LF

1.19 19B 10-inch Diameter IA-CS046 148 LF

1.20 20 Slotted 18-inch CMP Riser Structure IA-CS-051 1 EA

1.22 21 CMP Tile Outlets with Animal Guard IA-CS-051

1.21 21A 15-inch diameter by 20 feet IA-CS-051 1 EA

1.22 21B 12-inch diameter by 20 feet IA-CS-051 1 EA

1.23 22 Riprap. IDOT Class E IA-CS-061 15 TN

1.24 23 Erosion Stone IA-CS-061 16 TN

1.25 24 Straw Wattle IA-CS-005 100 LF

1.26 25 Silt Fences IA-CS-005 1325 LF

TOTAL BASE BID………………………………………………………………………………………$________________

Worksheet purposes only. Bids will only be accepted through the on-line Iowa Management of Procurement & Contracts System (IMPACS).

To register and learn about IMPACS, go to:

https://solutions.sciquest.com/apps/Router/SupplierLogin?CustOrg=DASIowa

END OF DOCUMENT CC

Attachment No. 2

Revised set of Plans

30402-C0-TITLE

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

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NUTRIENT REDUCTION WETLAND

CALHOUN COUNTY, IOWA

PROJECT INDEX:

OWNER:

IDALS

WATER RESOURCES BUREAU

HOOVER STATE OFFICE BUILDING

1305 E. WALNUT STREET

DES MOINES, IA 50319

PROJECT

ADDRESS / LOCATION:

SECTION 32/T88N/R34W

GARFIELD TWP

LYTTON, IA

PROJECT MANAGER: CALEB RASMUSSEN

EMAIL: CALEB.RASMUSSEN@ISGINC.COM

IDALS CAL883432B

ISG PROJECT # 24-30402

B.M. ELEVATION=1216.76

CUT "X" IN TOP OF RCP CULVERT SOUTH

SIDE OF FIELD DRIVE ALONG DURANT AVE

AND SOUTH PROPERTY LINE.

MANAGING OFFICE:

TOPOGRAPHIC SURVEY

THIS PROJECT'S TOPOGRAPHIC SURVEY CONSISTS

OF DATA COLLECTED IN APRIL 2024 BY ISG.

PROJECT GENERAL NOTES

GIS DISCLAIMER:

INFORMATION FOR THE BOUNDARY / LOT LINES, AND UNDERGROUND UTILITIES SHOWN WAS DERIVED FROM DIGITAL DATABASES AND IS FOR INFORMATIONAL PURPOSES ONLY. DATA MAY NOT HAVE BEEN

PREPARED FOR, OR BE SUITABLE FOR: LEGAL, ENGINEERING, OR SURVEYING PURPOSES.

LOCATION MAP

N

S

W E

PROJECT DATUM

HORIZONTAL COORDINATES HAVE BEEN REFERENCED TO THE

NORTH AMERICAN DATUM OF 1983 (NAD83), ON THE IOWA

REGIONAL ZONE 4 COORDINATE SYSTEM, IN U.S. SURVEY FEET.

ELEVATIONS HAVE BEEN REFERENCED TO THE NORTH

AMERICAN VERTICAL DATUM OF 1988 (NAVD 88).

RTK GPS METHODS WERE USED TO ESTABLISH HORIZONTAL AND

VERTICAL COORDINATES FOR THIS PROJECT.

SPECIFICATIONS REFERENCE

ALL CONSTRUCTION SHALL COMPLY WITH CALHOUN COUNTY'S

REQUIREMENTS AND WITH THE MOST RECENT NRCS

CONSTRUCTION SPECIFICATION, UNLESS DIRECTED

OTHERWISE.

1. ALL WORK SHALL CONFORM TO THE CONTRACT

DOCUMENTS, WHICH INCLUDE, BUT ARE NOT LIMITED TO,

THE OWNER - CONTRACTOR AGREEMENT, THE PROJECT

MANUAL (WHICH INCLUDES GENERAL SUPPLEMENTARY

CONDITIONS AND SPECIFICATIONS), DRAWINGS OF ALL

DISCIPLINES AND ALL ADDENDA, MODIFICATIONS, AND

CLARIFICATIONS ISSUED BY ARCHITECT/ENGINEER.

2. CONTRACT DOCUMENTS SHALL BE ISSUED TO ALL

SUBCONTRACTORS BY THE GENERAL CONTRACTOR IN

COMPLETE SETS IN ORDER TO ACHIEVE THE FULL EXTENT

AND COMPLETE COORDINATION OF ALL WORK.

3. WRITTEN DIMENSIONS TAKE PRECEDENCE OVER SCALED

DIMENSIONS. NOTIFY ARCHITECT/ENGINEER OF ANY

DISCREPANCIES OR CONDITIONS REQUIRING INFORMATION

OR CLARIFICATION BEFORE PROCEEDING WITH THE WORK.

4. FIELD VERIFY ALL EXISTING CONDITIONS AND DIMENSIONS.

NOTIFY ARCHITECT/ENGINEER OF ANY DISCREPANCIES OR

CONDITIONS REQUIRING INFORMATION OR CLARIFICATION

BEFORE PROCEEDING WITH THE WORK.

5. DETAILS SHOWN ARE INTENDED TO BE INDICATIVE OF THE

PROFILES AND TYPE OF DETAILING REQUIRED

THROUGHOUT THE WORK. DETAILS NOT SHOWN ARE

SIMILAR IN CHARACTER TO DETAILS SHOWN. WHERE

SPECIFIC DIMENSIONS, DETAILS, OR DESIGN INTENT

CANNOT BE DETERMINED, NOTIFY ARCHITECT/ENGINEER

BEFORE PROCEEDING WITH THE WORK.

6. ALL MANUFACTURED ARTICLES, MATERIALS, AND

EQUIPMENT SHALL BE APPLIED, INSTALLED, CONNECTED,

ERECTED, CLEANED, AND CONDITIONED ACCORDING TO

MANUFACTURERS' INSTRUCTIONS. IN CASE OF

DISCREPANCIES BETWEEN MANUFACTURERS'

INSTRUCTIONS AND THE CONTRACT DOCUMENTS, NOTIFY

ARCHITECT/ENGINEER BEFORE PROCEEDING WITH THE

WORK.

7. ALL DISSIMILAR METALS SHALL BE EFFECTIVELY ISOLATED

FROM EACH OTHER TO AVOID GALVANIC CORROSION.

8. THE LOCATION AND TYPE OF ALL EXISTING UTILITIES

SHOWN ON THE PLANS ARE FOR GENERAL INFORMATION

ONLY AND ARE ACCURATE AND COMPLETE TO THE BEST

OF THE KNOWLEDGE OF I & S GROUP, INC. (ISG). NO

WARRANTY OR GUARANTEE IS IMPLIED. THE

CONTRACTOR SHALL VERIFY THE SIZES, LOCATIONS, AND

ELEVATIONS OF ALL EXISTING UTILITIES PRIOR TO

CONSTRUCTION. CONTRACTOR SHALL IMMEDIATELY

NOTIFY ENGINEER OF ANY DISCREPANCIES OR

VARIATIONS FROM PLAN.

9. THE CONTRACTOR IS TO CONTACT "IOWA ONE CALL" FOR

UTILITY LOCATIONS A MINIMUM OF 2 BUSINESS DAYS

PRIOR TO ANY EXCAVATION / CONSTRUCTION

(1-800-292-8989).

2-13-2025

24-30402

C0-10 TITLE

---- ---- C0-10

C0-10

CONSTRUCTION PLANS

CALHOUN COUNTY IOWA

1725 LAKE AVE. NORTH

STORM LAKE, IA 50588

PHONE: 712.732.7745

STORM LAKE OFFICE

TITLE

JAT

HPT

CDR

SHEET INDEX

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

270TH STREET

280TH STREET

DU

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Printed or typed name

(signature) (date)

License number

SEAL

WIO A

LI

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NS

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PROFESS IONAL ENGINEER

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

My license renewal date is December 31, Pages or sheets covered by this seal:

CALEB

RASMUSSEN

25713

CALEB RASMUSSEN

All Sheets

25713

2-13-2025

C0-10 TITLE

C0-20 NOTES AND QUANTITIES

C0-30 DETAILS

C0-31 DETAILS

C0-32 DETAILS

C0-33 DETAILS

C1-10 SITE RESTORATION PLAN

C2-10 EXISTING SITE - WATERSHED

C3-10 SITE PLAN

C3-20 INLET PLAN & PROFILE

C3-21 OUTLET PLAN & PROFILE

C4-10 GRADING PLAN

C4-20 CUT - FILL

C4-30 CROSS SECTION

LYTTON, 2 MILES

PROJECT LOCATION

SCALE IN FEET

500 1000

TO THE BEST OF MY PROFESSIONAL KNOWLEDGE, JUDGEMENT, AND BELIEF, THESE PLANS MEET THE APPLICABLE

NRCS STANDARDS AND APPLICABLE LAWS AND REGULATIONS.

TO THE BEST OF MY PROFESSIONAL KNOWLEDGE, JUDGEMENT,

BELIEF, THE PLANS MEET APPLICABLE NRCS STANDARDS.

ENGINEER'S SIGNATURE DATE

I HAVE REVIEWED AND AGREE WITH THE CONTENTS OF THE

PLAN AND SPECIFICATIONS AS PREPARED.

LANDOWNER SIGNATURE DATE

CONTRACTOR IS RESPONSIBLE FOR CALLING IOWA ONE CALL

ONE CALL TICKET NO.

IF A CULTURAL RESOURCE IS IDENTIFIED DURING

CONSTRUCTION, WORK WILL STOP IMMEDIATELY AND THE

LOCAL NRCS FIELD OFFICE WILL BE NOTIFIED.

I CERTIFY THAT THIS PRACTICE HAS BEEN CONSTRUCTED IN

ACCORDANCE WITH THE PLANS AND SPECIFICATIONS.

CONTRACTORS SIGNATURE DATE

ENGINEER'S REP. SIGNATURE DATE

IA NRCS JOB CLASS III

Printed or typed name

(signature) (date)

License number

SEAL

WIO A

LI

CE

NS

ED

PROFESS IONAL ENG INEER

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

My license renewal date is December 31, Pages or sheets covered by this seal:

SPENCER

DEAN PECH

P28161

SPENCER DEAN PECH

REVISIONS ON SHEETS C0-10, C0-20, C0-30, C0-31, C1-10, C3-10, AND C3-21

25713

8-19-2026

8-18-2026 REVISIONS FOLLOWING PRE-BID MEETING HLC8-18-2026 REVISIONS FOLLOWING PRE-BID MEETING HLC

30402-C0-DETAILS

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

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C0-20

2-13-2025

24-30402

C0-20 NOTES AND QUANTITIES

---- ---- C0-20

CALHOUN COUNTY IOWA

NOTES AND

QUANTITIES

JAT

HPT

CDR

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

CONSTRUCTION NOTES:

GENERAL NOTES

1. ACCESS - CONTRACTOR IS TO ARRANGE ACCESS WITH LANDOWNER PRIOR TO CONSTRUCTION. CONTRACTOR IS RESPONSIBLE TO SECURE PERMISSION OF THE

COUNTY ENGINEER TO CONSTRUCT TEMPORARY ACCESS IF NECESSARY.

2. EQUIPMENT STAGING: CONTRACTOR TO DESIGNATE EQUIPMENT STAGING AREA AT PRE-CONSTRUCTION MEETING.

2.1. REFER TO THE PLANS FOR FLOOD PLAIN EXTENTS. THE CONTRACTOR IS RESPONSIBLE FOR MONITORING WEATHER AND REMOVING EQUIPEMENT FROM THE

FLOODPLAIN IF AN ADVERSE EVENT IS EXPECTED.

3. WORK LIMITS ARE CONFINED TO THE EASEMENT AREA EXCEPT WHERE INDICATED ON PLANS. CONTRACTOR SHALL TRY TO MINIMIZE DISTURBANCE FOOTPRINT.

4. UTILITIES: CONTRACTOR IS RESPONSIBLE FOR CALLING IOWA ONE CALL (1-800-292-8989) AND MUST PROVIDE VERIFICATION (TICKET NO.) TO THE ENGINEER PRIOR

TO MOBILIZATION. CONTRACTOR RESPONSIBLE FOR PROTECTION OF ALL UTILITIES AND IS RESPONSIBLE TO VERIFY LOCATION/ELEVATION OF ALL UTILITIES IN WORK AREA PRIOR TO EXCAVATION. A DESIGN ONE CALL WAS PERFORMED ON DECEMBER 31, 2024.

4.1. EXPECTED WETLAND UTILITIES: NONE.

4.2. EXPECTED FIELD ENTRANCE UTILITIES:

4.2.1. MID-AMERICAN ELECTRIC

4.2.2. MID-AMERICAN GAS

4.2.3. WINDSTREAM COMMUNICATIONS

5. DEWATERING: CONTRACTOR SHALL BE RESPONSIBLE FOR MAINTAINING REASONABLE DRY WORKING CONDITIONS DURING CONSTRUCTION. ANY TEMPORARY

DEWATERING IS TO BE AT CONTRACTOR'S DISCRETION AND INCIDENTAL TO ITEMS OF WORK.

6. TOPSOIL STRIPPING (CS-IA-01):

a. STRUCTURE AND BORROW AREAS SHALL BE STRIPPED OF NO LESS THAN TWELVE (12) INCHES.

b. AREAS FOR TILE WORK SHALL BE STRIPPED NO LESS THAN TWELVE (12) INCHES.

c. ALL OTHER AREAS TO BE STRIPPED TO NINE (9) INCHES.

7. TOPSOIL STOCKPILE: CONTRACTOR IS RESPONSIBLE FOR SEGREGATION TOPSOIL FROM EXCAVATION SPOILS THROUGHOUT CONSTRUCTION. CONTRACTOR IS TO

DESCRIBE TOPSOIL MANAGEMENT AT PRECONSTRUCTION MEETING.

8. TOPSOIL SPREADING: ALL AREAS RECEIVING TOPSOIL DRESS SHALL BE UNDERCUT 6 INCHES AND TOPSOIL SHALL BE SPREAD AT LEAST 6 INCHES THICK TO THE

DESIGN SURFACE, OR AS INDICATED ON PLANS.

9. EARTHFILL: ALL STRUCTURAL EARTHFILL SHALL BE PLACED AND COMPACTED IN LOOSE LIFTS NO THICKER THAN NINE (9) INCHES. ENGINEER MAY DIRECT THINNER

LIFTS BASED ON AVAILABLE COMPACTION EQUIPMENT.

10. AREAS UNDER FILL SHALL BE SCARIFIED LIGHTLY BEFORE FIRST LIFT TO A DEPTH OF SIX (6) INCHES AND RECOMPACTED IN ACCORDANCE WITH SPECIFICATION

IA-23, SECTION 6, METHOD 1.

11. CONSTRUCT CORE TRENCH UNDER ENTIRE DIKE ALIGNMENT AT CENTERLINE.

12. TESTING: CONTRACTOR TO ENSURE ADEQUATE MOISTURE AND DENSITY THROUGHOUT CONSTRUCTION. COMPACTION IS TO BE PERFORMED IN ACCORDANCE

WITH SPECIFICATION IA-23 EARTHFILL. CONTRACTOR IS RESPONSIBLE FOR ENSURING SOILS MEET ADEQUATE MOISTURE REQUIREMENTS.

13. WEED CONTROL IA CS-06: CONTRACTOR IS REQUIRED TO CONTROL WEED GROWTH WITHIN THE WORK LIMITS AS NEEDED WITHIN THE CONSTRUCTION LIMITS, FOR

THE APPROVED CONSTRUCTION WINDOW.

14. RUBBISH DISPOSAL IA CS-01: ROCKS, FENCE, AND RUBBISH ENCOUNTERED WITHIN THE EASEMENT AREA ARE TO BE DISPOSED OF BY BURIAL OR OTHER

APPROVED MEANS. MISCELLANEOUS ROCKS AND RUBBISH ENCOUNTERED DURING EXCAVATION ARE TO BE INCLUDED FOR BURIAL AS WELL. A MINIMUM OF THREE

(3) FEET OF COVER OVER BURIED RUBBISH IS REQUIRED. CONTACT ENGINEER PRIOR TO REMOVING ANY FENCE.

15. WORKMANSHIP: CONTRACTOR SHALL PERFORM ALL WORK WITH CRAFTSMAN-LIKE APPEARANCE AND LEAVE NO TRASH/DEBRIS AFTER DEMOBILIZATION.

16. SAFETY - CONTRACTOR IS RESPONSIBLE FOR SAFETY ON THE WORK SITE, INCLUDING THE BRACING OF, SHORING OF, SHAPING OF, AND/OR USE OF TRENCH BOX IN

THE EXCAVATIONS. THIS INCLUDES KNOWLEDGE AND COMPLIANCE WITH ALL RULES AND REGULATIONS INTENDED TO PROTECT THE HEALTH AND SAFETY OF THE CONTRACTOR, ENGINEERS, AND OWNER'S PERSONNEL. ALL TRENCHING SHALL BE DONE ACCORDING TO OSHA STANDARDS FOR THE PROTECTION OF LIFE.

17. FLOODPLAIN: PROJECT WORK LIMITS RESIDE IN A MAPPED FLOODPLAIN. MATERIALS, EQUIPMENT, AND EXCESS SPOIL MAY NOT BE STOCKPILED OR STORED WITHIN THE FLOODPLAIN. FINAL GRADING SHOULD BE DONE TO ENSURE ANY SPOIL PLACEMENT AND FILL WITHIN THE FLOODPLAIN DOES NOT DEVIATE SIX (6) INCHES

FROM EXISTING GRADE.

18. VEGETATION CLEARING & TREATMENT: VEGETATION MANAGEMENT TO BE DETERMINED BASED ON CONSTRUCTION SCHEDULE AND AVAILABLE SEEDING WINDOWS.

CONTRACTOR IS EXPECTED TO BE ABLE TO PERFORM, MOWING/HAYING WITH REMOVAL (SUCH AS BIG ROUND BALES), CONTROL FIRE BURN, CHEMICAL BURN (BY LICENSED APPLICATOR), AND DISCING-HARROWING. FOR THE PURPOSES OF BIDDING, A CONTROL FIRE BURN, FOLLOWED BY 2 APPLICATIONS FOR CHEMICAL

TERMINATION, FOLLOWED BY LIGHT DISCING WITH DRAG HARROW FOLLOWER IS EXPECTED.

19. IDALS AND ISG DO NOT GUARANTEE THE WETLAND WILL FILL OR REMAIN FILLED WITH WATER.

TILE INSTALLATION

20. WORK LIMITS - OUTSIDE OF EASEMENT AREA, CONTRACTOR SHALL LIMIT CONSTRUCTION ACTIVITY TO WITHIN A 90 FOOT WIDE CORRIDOR ALONG THE LENGTH OF

THE TILE ALIGNMENTS AS SHOWN ON THE PLANS.

21. TILE INVESTIGATION - VERIFY LOCATIONS AND ELEVATIONS OF EXISTING TILE PRIOR TO CONSTRUCTION. TILE INVESTIGATION INCLUDES TIME NECESSARY TO

LOCATE AND DIG EXISTING TILES. EXPLORATION FOR DESIGN FOR TILE ENCOUNTERED, BUT NOT SHOWN ON THE PLANS WILL BE PAID UNDER THIS ITEM.

22. CONTRACTOR SHALL NOTIFY THE ENGINEER OF ALL TILE FOUND DURING THE TILE INVESTIGATION AND DURING WETLAND EXCAVATION.

23. CONTRACTOR SHALL MAKE EFFORT TO SEGREGATE ORGANIC TOPSOIL TO MINIMUM DEPTH OF 12 INCHES FOR ALL TILE WORK OUTSIDE OF EXCAVATION AND FILL

AREAS.

24. FIELD TILE CONNECTIONS - CONNECTIONS TO INTERCEPTED FIELD TILE 12" DIAMETER AND LESS SHALL BE MADE AND ENCASED IN A PORTLAND CEMENT

CONCRETE (PCC) COLLAR AT LEAST TWELVE (12) INCHES WIDE AND FOUR (4) INCHES THICK, CONTINUOUS AROUND THE JOINTS. ALTERNATIVE CONNECTIONS MUST

BE APPROVED BY THE ENGINEER.

25. ALL TILE SHALL BE BLINDED WITH NATIVE SOILS OR ASTM CLASS 2 MATERIAL WHEN REQUIRED IN REGULAR INTERVALS AS INSTALLATION PROCEEDS. TILE FOUND TO BE FLOATING IN THE TRENCH SHALL BE REMOVED, THE TRENCH DEWATERED, AND THE TILE IMMEDIATELY INSTALLED AND BLINDED.

26. TILE SHALL BE INSTALLED ACCORDING TO MANUFACTURERS' SPECIFICATIONS USING EITHER A SPOON TRENCH CONFORMING TO THE CURVE OF THE PIPE UP TO THE HAUNCH/SPRING LINE. FOR A BLAT BOTTOM TRENCH THE PIPE SHALL BE BEDDED AND BACKFILLED WITH AGGREGATE TO THE SPRING LINE.

RISER INLET & CONTROL STRUCTURE NOTES

27. STRUCTURE SHOP DRAWINGS ARE REQUIRED FOR ENGINEER'S REVIEW AND APPROVAL BEFORE FABRICATION OF STRUCTURES, REFER TO INSPECTION TABLE.

28. DRAIN BASIN TO BE CUSTOM MANUFACTURED ACCORDING TO PLAN DETAILS.

29. DRAINAGE CONNECTION STUB JOINT TIGHTNESS SHALL CONFORM TO ASTM D3212 FOR CORRUGATED HDPE.

30. USE ASTM CLASS 2 MATERIAL TO BED AND LEVEL STRUCTURE. LOOSE EARTH FILL IS NOT PERMITTED AS BACKFILL TO LEVEL THE STRUCTURE.

31. CHECK TO ENSURE STRUCTURE IS LEVEL PRIOR TO BACKFILLING. PLACE BACK FILL MATERIAL AROUND STRUCTURE IN 6" LIFTS AND COMPACT BY HAND. DO NOT

USE POWERED EQUIPMENT.

32. BACKFILL AROUND STRUCTURES SHALL BE COMPACTED BY HAND. NO MECHANICAL PACKING METHODS MAY BE USED.

ITEMS OF WORK TABLE

INSPECTION TABLE

CONSERVATION PRACTICE STANDARDS

PRIMARY

656: CONSTRUCTED WETLAND

SUPPORTING

327: CONSERVATION COVER

342: CRITICAL AREA PLANTING

356: DIKE OR LEVEE

587: STRUCTURE FOR WATER CONTROL

606: SUBSURFACE DRAIN

620: UNDERGROUND OUTLET

8-13-2026 ADD SILT FENCE TO IOW & INSPC HLC

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

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C0-30

2-13-2025

24-30402

C0-30 DETAILS

---- ---- C0-30

CALHOUN COUNTY IOWA

DETAILS

JAT

HPT

CDR

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

SECTION VIEW

PLAN VIEW

NOTE:

NUMBER OF RODS AND SIZE OF GRATE

VARY W/ SIZE OF TILE INTAKES. PAINT

WITH TWO (2) COATS RUST INHIBITING

PAINT FOLLOWING FABRICATION.

CMP SLOTTED INTAKE RISER

NTS

BEEHIVE INLET GRATE (STEEL BARS)

NTS

9040.110

RIP RAP FOR PIPE OUTLET

ONTO FLAT GROUND

SUDAS Standard Specifications

Section A-A

To e of S lo pe min.

8'

8'

4'

T

Slope = 0%

Stable Ground

Thickness, T Construct notch at end of apron.

Depth = 2T

PLAN

PROFILE

4'

4'

1'

18" DIA CMP

TOP VIEW

3 F T

POOL EL=1181.50

I=1178.00

WATER CONTROL STRUCTURE

NTS

18" MIN.12" - 18"

2'

78"

2" MIN.

7.25' MIN.

8' MAX.

ELEV = 1184.50

1/4" STEEL ROD MINIMUM

BEEHIVE INLET GRATE

(SEE DETAIL)

SLOTTED PERFORATIONS

2" X 6" SLOTS SPACED 8" HORIZ. & 6"

VERT. OFFSET COLUMNS 4" AND 8"

FROM TOP OF STRUCTURE

30° TYPICAL

SEAM

℄ SLOT

2' WELDED STUB, 10" DIA.

SURROUND

RISER WITH 16

TON EROSION

STONE

CORRUGATED

ALUMINIZED 16

GAUGE METAL

RISER W/

PERFORATIONS

CONNECT TO HDPE WITH

REINFORCED CONCRETE COLLAR OR

MANUFACTURED COUPLER FOR

DISSIMILAR MATERIALS

(BUTT JOINT)

BERM

SLOPE

EXISTING GROUND

54" CMP RISER

8" CONCRETE BASE

15" CMP 15" CMP

10" HDPE10" HDPE

2-CHAMBER WCS

LOCKABLE LID

#4 DEFORMED BAR @ 12" OCEW

EMBED 1 1/2 CORRUGATIONS

2'

24"

SURROUND WITH 4 TN CRUSHED

STONE, ASTM D2321

CLASS 2 MATERIAL

HDPE SPOON TRENCH

NTS

PIPE IDUNDISTURBED SOIL

BACKFILL WITH TRENCH MATERIAL

SPOON EXTENTS

PLACE 1.5 TN/100LF ASTM CLASS 2

MATERIAL (MECHANICALLY

COMPACT TO TOP OF PIPE IN 6"

LIFTS), WHERE SHOWN ON PLANS

NOTES:

1. ASTM CLASS 2 AND BACKFILL SHALL BE INCIDENTAL TO CONSTRUCTION.

2. SPOON DIMENSIONS SHALL COMPLY WITH PIPE MANUFACTURER'S SPECIFICATIONS.

3. THE FIRST LIFT OF BACKFILL SHALL BE PLACED WITH AN EXCAVATOR WITH NO MORE

THAN 2' OF DROP.

4. CRUSHED CONCRETE, MEETING THE REQUIREMENTS OF ASTM CLASS 2 MATERIAL

MAY BE USED. ENGINEER TO AUTHORIZE USE, PRIOR TO MATERIAL STAGING.

FIL

L H

EI

GH

T (V

AR

IE

S)

Modified for project use.

CONNECT TO HDPE WITH

REINFORCED CONCRETE COLLAR OR

MANUFACTURED COUPLER FOR

DISSIMILAR MATERIALS

CONNECT TO HDPE WITH

REINFORCED CONCRETE COLLAR OR

MANUFACTURED COUPLER FOR

DISSIMILAR MATERIALS

INLET AND

OUTLET

INVERT=1177.55

NOTE:

DO NOT USE ENGINEERING FABRIC TO

INSTALL RISER OR PLACE SURROUND

STONE.

8"

SUPPORT STUB ON CONCRETE BASE

6'

18"

PLAN VIEW

ENSURE INTERNAL

STRUCTURE LID

CAN BE REMOVED

WITHOUT

REMOVING

EXTERNAL

STRUCTURE LID

LID HINGE

SECTION VIEW

6" MIN6" MIN

NOTE: IN LIEU OF FABRIC USE 1.5TN ASTM CLASS 2, 6 INCH THICK

PLACE 6" OF CRUSHED ROCK

42" CONCRETE PAD

8-19-2026 ADDED CONCRETE BASE TO SLOTTED INTAKE RISER, ADD GAUGE

TO SLOTTED INTAKE RISER CALL OUT

HLC

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

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C0-31

2-13-2025

24-30402

C0-31 DETAILS

---- ---- C0-31

CALHOUN COUNTY IOWA

DETAILS

JAT

HPT

CDR

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

OPTION 1 WCS SPECIFIC:

1. FLASH BOARDS SHALL BE PVC.

2. ALL RIVETS SHALL BE STAINLESS STEEL.

3. FLASHBOARD CHANNEL SHALL BE ANODIZED ALUMINUM.

4. FLASHBOARDS WILL REMAIN IN STRUCTURE DURING INSTALLATION.

5. FLASHBOARDS SHALL BE LUBRICATED UPON REMOVAL.

WCS GENERAL NOTES:

1. TOOL TO REMOVE FLASHBOARDS/ACTUATE VALVE IS TO REMAIN IN WCS FOLLOWING INSTALLATION.

2. FOR INLET ADAPTER, MAX SIZE IS TWO SIZES DOWN FROM STRUCTURE SIZE (I.E. 8" ADAPTER ON 12"

STRUCTURE.

3. CHECK TO ENSURE THE STRUCTURE IS LEVEL PRIOR TO BACKFILLING. PLACE THE BACKFILL MATERIAL AROUND

THE STRUCTURE IN 6" LIFTS AND COMPACT BACKFILL BY HAND ONLY. DO NOT USE POWERED EQUIPMENT TO

COMPACT THE BACKFILL.

4. WATER CONTROL STRUCTURES WILL HAVE A MINIMUM OF 20' NONPERFORATED PIPE BETWEEN WATER

CONTROL STRUCTURE AND DITCH.

5. ONE ANTISEEP COLLAR WILL BE INSTALLED ON THE 20' OF NONPERFORATED PIPE BETWEEN THE WATER

CONTROL STRUCTURE AND DITCH.

6. FOLLOW MANUFACTURER'S RECOMMENDATIONS FOR INSTALLATION OF WATERTIGHT TEE, INCLUDING MINIMUM

ANGLE OF SEPARATION.

7. WATER TIGHT TEE, QUANTITY, AND INSTALLATION METHOD DEPENDENT ON WCS MANUFACTURER.

8. FINAL CONFIGURATION OF WATER CONTROL STRUCTURES WILL BE DETERMINED BY AVAILABILITY FROM THE

MANUFACTURER.

9. COMPONENTS OF WATER CONTROL STRUCTURES MAY BE PRICED SEPARATELY DEPENDING ON THE SUPPLIER.

NRCS NOTES*:

1. WATER CONTROL STRUCTURE (WCS) MATERIALS AND INSTALLATION SHALL BE IN CONFORMANCE WITH IOWA

NRCS CONSTRUCTION SPECIFICATION (CS) IA-45, PLASTIC (PVC, PE) PIPE.

2. CONNECTING PIPE MATERIALS AND INSTALLATION SHALL BE IN CONFORMANCE WITH CS IA-45; IA-46, TILE

DRAINS FOR LAND DRAINAGE; IA-51, CORRUGATED METAL PIPE CONDUITS; OR IA-52, STEEL PIPE CONDUITS.

3. WCS SHALL BE FABRICATED OF PVC WITH INTEGRAL UPSTREAM AND DOWNSTREAM WATER-TIGHT COUPLING

CONNECTIONS, CORROSION-RESISTANT STOP BOARDS, ALUMINUM EXTRUSIONS AND STAINLESS STEEL FASTENERS AND APPURTENANCES. ACCEPTABLE MODELS INCLUDE AGRI DRAIN, NYLOPLAST, OR APPROVED

EQUAL.

4. WCS SHALL PROVIDE FLOW CAPACITY EQUAL TO OR GREATER THAN THAT OF ADJACENT PIPE UNDER

EXPECTED FLOW CONDITIONS.

5. STOP BOARDS SHALL PROVIDE A WATER-TIGHT SEAL UNDER 4 FT OF PRESSURE HEAD (MIN.).

6. IN SITUATIONS WHERE WATER LEVELS HIGHER THAN MAXIMUM DESIGN ELEVATION WOULD IMPACT

NEIGHBORING PROPERTIES OR OTHER ASPECTS OF THE SITE DESIGN, CONSIDER A CUSTOM-ORDER BOX

WHICH LIMITS EXTENT OF STOP BOARD TRACKS TO THE MAXIMUM DESIGN WEIR ELEVATION.

7. STOP BOARD REMOVAL TOOL SHALL BE PROVIDED.

8. AS AN ALTERNATIVE TO A STOP BOARD STRAIGHT WEIR STRUCTURE, A CIRCULAR INNER STANDPIPE MAY BE

PROVIDED WHICH MEETS THE DESIGN FLOW REQUIREMENTS, WITH APPROVAL OF THE ENGINEER (NYLOPLAST

STANDPIPE WCS OR EQUAL).

9. ALL CONNECTIONS SHALL BE WATER-TIGHT.

10. STRUCTURE LID SHALL BE PROVIDED WITH LOCKING MECHANISM.

11. BACKFILL AROUND THE WCS SHALL MEET THE REQUIREMENTS OF CS IA-45. NORMAL STOP BOARD OPERATION

SHALL BE VERIFIED FOLLOWING BACKFILL.

12. MARK LOCATION OF EACH STRUCTURE USING POST OR MANUFACTURED MARKER FLAG FOR SAFETY IN THE

FIELD *FROM USDA-NRCS IA-1530 STANDARD DRAWING

STRIKEOUT ITEMS ARE NOT REQUIRED FOR THIS SET

FLOW FLOW

WATER TIGHT FITTING

FOR UPSTREAM

CONNECTING PIPE

LID TO BE FURNISHED WITH STRUCTURE

WATER TIGHT FITTING

FOR DOWNSTREAM

CONNECTING PIPE

ALL FLASH BOARDS SHALL BE FITTED

WITH LIFTING HOOKS AND EDPM SEAL

(NOT SHOWN)

EXTRA FLASH BOARDS TO BE

PULLED ABOVE SET WEIR ELEVATION

FOR STORAGE

FLASH BOARD GUIDE CHANNEL

OPTION 1

WATER CONTROL STRUCTURE DETAIL

NTS

AUXILIARY SPILLWAY

WITH CONCRETE EROSION MAT

NTS

WETLAND NWL = 1181.50

EXISTING GROUND

PROPOSED GRADE FLOW TIED CONCRETE BLOCK EROSION MAT

INSTALLED PER MANUFACTURER RECOMMENDATIONS FOR

PERPENDICULAR FLOW FOR SPILLWAYS AND OVERFLOWS

8:1

9040.119

SILT FENCE

SUDAS Standard Specifications

Foreslope Back slo pe

Post Spacing

(5'-0" max.)

Post Spacing

(5'-0" max.)

Fabric

Variable (20'-0" for a normal 10'-0" wide ditch.)

2" min.

20" min.

Post

Wire or Cable Ties

Insert 12 inches of fabric a minimum of 6 inches deep (fabric may be folded below the ground line).

TYPICAL SILT FENCE DITCH CHECK

ATTACHMENT TO POST

8-13-2026 ADDED SILT FENCE DETAIL HLC

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

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C0-32

2-13-2025

24-30402

C0-32 DETAILS

---- ---- C0-32

CALHOUN COUNTY IOWA

DETAILS

JAT

HPT

CDR

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

9040.105

WATTLE

SUDAS Standard Specifications

Disturbed Area

Area to be Protected

Space as specified in the contract documents.

4' -0

" m ax

Wattle

Dire ctio n of F low

3'-0"

4'-0" max.

Stakes

2-4" Trench

Compact trench spoil against uphill side of wattle.

9" (nominal) dia.

or as specified.

Joint Wrap

Turn uphill.

9040.111

RIP RAP APRON FOR PIPE

OUTLET INTO CHANNEL

SUDAS Standard Specifications

Top of Bank

Stable Channel

Edge of Channel

Top of Bank

Section A-A

W id th , W

T min.

Slope = 0%

Construct notch at end of apron.

Depth = 2T.

CROSS-SECTION

Thickness, T

PROFILE

PLAN

4'

10' 10'

6:1

1:1

8'

4'

CENTERLINE

TOPSOIL SPREAD

TOPSOIL STRIPPING

CORE TRENCH

EARTHEN DIKE

DIKE AND CORE TRENCH

TYPICAL SECTION

NTS

PROPOSED GROUND

EXISTING

GROUND

TRENCH DAM

NTS

2'

NOTES:

1. BETONITE SHALL BE EITHER IN

GRANULAR OR CHIP FORM, WITH A

MAXIMUM NOMINAL SIZE OF 3

8"

MIXED WITH NO MORE THAN 80%

SAND (C33).

2. THE TRENCH DAM (ANTI-SEEP COLLAR)

SHALL EXTEND AT LEAST 6 INCHES

BEYOND THE STANDARD PIPE

TRENCH.

3. PLACEMENT OF THE COLLAR SHALL NOT

BE WITHIN 2 FEET OF A PIPE JOINT.

4. MINMUM DISTANCE FROM EDGE OF PIPE

IS 3x PIPE DIAMETER OR 6" BEYOND

TRENCH EXTENTS, WHICHEVER IS

GREATER, TYP

BENTONITE/SAND MIX (25:75)

2.5'

SEE NOTE 4

2.5'

SEE NOTE 410"

CARRIER PIPE

2'

MI

N 2'

PLACE 6" OF CRUSHED ROCK

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

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S:

\P

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SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C0-33

C0-33 DETAILS

24-30402

2-13-2025

C0-33

IOWACALHOUN COUNTY

CDR

HPT

JAT

DETAILS

WIDTH VARIES TO TOP WIDTH OF

EMERGENCY OVERFLOW

MINIMUM 6" OF FREEBOARD

EXTEND TIED CONCRETE BLOCK MAT

MINIMUM 5'

BELOW NPE

NPE

IF EDGE OF TIED CONCRETE BLOCK MAT IS

EXPOSED TO SHEET FLOW,

RECESS THE OUTSIDE 2

BLOCKS INTO THE SLOPE AT

45 DEGREE ANGLE

EDGE NOT

EXPOSED TO

FLOW DOES

NOT NEED TO

BE RECESSED

UP CHANNEL MAT

DOWN CHANNEL MAT

FLOW

5' BELOW NPE (FOR

EMERGENCY

SPILLWAYS SEE

CONSTRUCTION

NOTE #3)

OVERFLOW DIKE

OVERFLOW ELEVATION

OUTFALL CHANNEL

FLOW

6" STANDARD

UNDERLAYMENT EXTENSION

12" GEOGRID EXTENSION

FLO

W

MAT SEAM PARALLEL

WITH FLOW

PANELWITH

GEOGRID AND STANDARD

UNDERLAYMENT EXTENSIONS

18" U-ANCHORS OR STAINLESS STEEL

ZIP TIES INSTALLED IN 2' INCREMENTS

ACROSS OVERLAP. INSTALL ANCHOR

BEHIND FIRST ROW BLOCK

EMERGENCY SPILLWAY - ISOMETRIC VIEW

OVERFLOW DIKE - PROFILE VIEW

1. OVERLAP METHOD FOR SEAMS PERPENDICULAR TO FLOW 2. OVERLAP METHOD FOR SEAMS PARALLEL TO FLOW

TIED CONCRETE BLOCK MAT - OVERFLOW CHANNEL PARALLEL TO FLOW

CONSTRUCTION NOTES:

1. AN ENGINEER OR MANUFACTURERS REPRESENTATIVE SHALL BE ONSITE FOR THE START OF THE INSTALLATION.

2. ALL SUBGRADE SURFACES PREPARED FOR PLACEMENT OF MATS SHALL BE SMOOTH AND FREE OF ALL ROCKS, STICKS, ROOTS, OTHER PROTRUSIONS, OR DEBRIS OF ANY KIND. THE

PREPARED SURFACE SHALL PROVIDE A FIRM UNYIELDING SUBGRADE FOR THE MATS.

3. PRIOR TO THE TIED CONCRETE BLOCK MAT INSTALLATION SEED AND FERTILIZE SUBGRADE WITH SITE SPECIFIC SEED MIX IN ACCORDANCE WITH THE PROJECT PLANS AND SPECIFICATIONS.

4. MAT SHALL EXTEND 5' BELOW NORMAL POND ELEVATION. (FOR EMERGENCY OVERFLOW INSTALLATIONS EXTEND THE MAT 3' DOWN THE INSIDE FACE OF THE OVERFLOW DIKE.)

5. INSTALL TIED CONCRETE BLOCK MAT ROLLS. MANUFACTURER RECOMMENDS INSTALLING THE WIDEST MAT POSSIBLE FOR SPILLWAY APPLICATIONS.

5.1. FOR WIDTHS WIDER THAN 16', INSTALL 15.5' WIDE MATS WITH GEOGRID AND STANDARD UNDERLAYMENT EXTENSIONS. INSTALL ADJACENT MAT OVER THE 12" GEOGRID AND 6" STANDARD UNDERLAYMENT EXTENSIONS OF THE ADJACENT MATS. ENSURE THE GEOGRID AND STANDARD UNDERLAYMENT EXTENSIONS ARE LAYING FLAT ON THE SUBGRADE BEFORE INSTALLING ADJACENT MAT OVER THE EXTENSIONS. INSTALL #3 REBAR 18" U-ANCHORS IN 2' INCREMENTS ACROSS THE GEOGRID AND STANDARD EXTENSION ABUTMENT. INSTALL ANCHORS PERPENDICULAR TO THE FLOW DIRECTLY BEHIND FIRST ROW OF BLOCKS ON THE ADJACENT MAT.

5.2. FOR ADDITIONAL SECTIONS OF MAT, OVERLAP THE DOWNSTREAM SECTION 18" WITH UPSTREAM SECTION OF MAT. PRIOR TO INSTALLING OVERLAP, FLIP UPSTREAM MAT BACK 24". EXCAVATE 2.25" OF SOIL 18" FROM THE END OF THE UPSTREAM MAT. DOWNSTREAM SECTION IS THEN LAID IN THE SHALLOW TRENCH. RETURN AND TAMP SOIL OVER INITIAL EDGE AND SEED AREA. FLIP END OF UPSTREAM MAT OVER THE SOIL COVERED INITIAL LEADING EDGE. SEED AND FERTILIZE SOIL INFILL PRIOR TO FLIPPING END OF UPSTREAM MAT OVER THE SOIL COVERED INITIAL LEADING EDGE OF DOWNSTREAM MAT. SECURE PERPENDICULAR OVERLAP SEAMS BY INSTALLING #3 REBAR - 18" U

ANCHORS PERPENDICULAR TO FLOW IN 2' INCREMENTS.

6. AT THE END OF THE ARMORED SPILLWAY, EMBED THE MAT 18" IN A TERMINATION TRENCH. FILL AND COMPACT TERMINATION TRENCH WITH SUITABLE FILL. (AS SPECIFIED BY EOR.)

SEED AND FERTILIZE PREPARED

SUBGRADE PRIOR TO

INSTALLING TIED CONCRETE BLOCK MAT

STANDARD

TIED CONCRETE BLOCK MAT

STANDARD

ADJACENT

TIED CONCRETE BLOCK MAT PANEL

FL

OW

SOIL INFILL AND SEED

OVERLAP SEAM

OVERLAP SEAM: INSTALL ENDING

EDGE OF UP CHANNEL MAT 18"

OVER THE LEADING EDGE OF THE

DOWN CHANNEL MAT. SECURE

OVERLAP SEAM BY INSTALLING

18" U-ANCHORS IN 2'

INCREMENTS BEHIND THE FIRST

BLOCK OF THE UP CHANNEL MAT

CURLEX II ECB

5-PICK LENO

WEAVE

STANDARD UNDERLAYMENT

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

GRODAHL FARMS INC

XXXXXXXX

SF

SF

SF

SF

SF

SF

SF SF SF

SF

SF

SF

SF

SF SF SF SF

SF

SF

SF

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C1-SWPPP

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

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SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C1-10

C1-10 SITE RESTORATION PLAN

SCALE IN FEET

50 100

TOP OF BANK (TYP)

WEST FORK CAMP CREEK

C1-10

2-13-2025

24-30402

SITE

RESTORATION

PLAN

JAT

HPT

CDR

CALHOUN COUNTY IOWA

EROSION CONTROL LEGEND

SYMBOL DESCRIPTION

RIP RAP, CLASS E OR EROSION STONE

BUFFER SEEDING

STRUCTURE, WATERWAY, & CHANNEL SEEDING

COVER CROP SEEDING

STRAW WATTLE

PURPOSED SILT FENCE

EXISTING CONTOUR (MINOR INTERVAL)

EXISTING CONTOUR (MAJOR INTERVAL)

PROPOSED CONTOUR (MINOR INTERVAL)

PROPOSED CONTOUR (MAJOR INTERVAL)

TEMPORARY WORK LIMITS

APPROXIMATE PARCEL LINE (TYP)

INSTALL NATIVE

BUFFER SEED MIX

3.0 ACRES

INSTALL CRIMPED STRAW

MULCH OVER DIKE

0.6 ACRES

STRAW WATTLE, 50FT EACH

INSTALL WATERWAY SEEDING,

0.2 ACRES

FINAL RESTORATION OF CROP GROUND

OUTSIDE EASEMENT AREA TO BE

DETERMINED DURING CONSTRUCTION

COVER CROP SEEDING

1.2 ACRES

INSTALL 397 LF SILT FENCE

SF

INSTALL 15 LF SILT FENCE

INSTALL 453 LF SILT FENCE

ADDED SILT FENCE OUTLINES AND ANNOTATIONS HLC8-13-2026

INSTALL 460 LF SILT FENCE

WILLIAMS, ROBERT R

GRODAHL FARMS INC

GRODAHL FARMS INC

39.15

RILEY, MINDY ANN

GRODAHL FARMS INC

GRODAHL FARMS INC

XXXXXXXX

TEMPORARY ENTRANCE

CONSTRUCTION ACCESS

(25FT ASSUMED WIDTH) TO

UTILIZE GRASSED WATERWAY

ERODING BANK MAY WARRANT

ENCROACHING INTO CROP

GROUND TO MAINTAIN ACCESS

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C2-EX-SITE

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

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\3

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O J\

0-

9\

ID

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B-

C

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H O

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C O

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TY

IA

\3

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F

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\3

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D \P

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2- C

2-

EX

-S

IT

E.

D

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S

AV

ED

B

Y:

O

W

EN

.O

EL

TJ

EN

BR

U

N S

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C2-10

C2-10 EXISTING SITE - SITE ACCESS

SCALE IN FEET

100 200

EXISTING WATERSHED

EXISTING 12" HDPE TILE (TYP)

C2-10

2-13-2025

24-30402

EXISTING SITE -

SITE ACCESS

JAT

HPT

CDR

CALHOUN COUNTY IOWA

270TH STREET

APPROXIMATE PARCEL LINE (TYP)

SITE ACCESS TO BE DECOMPACTED AND RESEEDED

WITH STRUCTURE, WATERWAY, & CHANNEL SEEDING.

0.8 ACRES ASSUMED TO BE RESTORED

GRODAHL FARMS INC

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100

FP100FP100FP100

FP100FP100FP100FP100FP100FP100

FP

FP

FP

FP

FP

FP

FP

FP

FP

FP

FP

FP100 FP100 FP100

XXXXXXXX

8'

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C3-SITE

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

R O

JE

C

TS

\3

P R

O J\

0-

9\

ID

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S

C

AL

B-

C

AL

H O

U N

C O

U N

TY

IA

\3

P

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D U

C

TI

O N

F

IL

ES

\3

C

IV

IL

D \P

R O

D U

C

TI

O N

D W

G S\

2- C

3-

SI

TE

.D

W G

S

AV

ED

B

Y:

L

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KE

.C

AR

PE

N

TE

R

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C3-10

C3-10 SITE PLAN

SCALE IN FEET

50 100

CONTAINMENT DIKE

TOP ELEV = 1183.0

6:1 SIDE SLOPES

EDGE OF FIELD (TYP)

TOP OF BANK (TYP)

PROPOSED CONTOUR (TYP)

EXISTING 12" HDPE TILE (TYP)

EASEMENT AREA

NORMAL POOL

ELEV = 1181.5

AREA = 2.35 ACRES

WATER CONTROL STRUCTURE

10' SUBMERGED BERM (TYP)

EXCAVATED AREA

AUXILIARY SPILLWAY

INSTALL 2,750 SF OF TIED CONCRETE BLOCK MATTING,

2 FT DIMENSIONAL OVERRUN INCLUDED FOR

MANUFACTURE VARIABILITY

WEST FORK CAMP CREEK

UNSTABLE BANK

FAILED TILE OUTLET

MODELED FLOODPLAIN EXTENTS

SPOIL WASTING AREA.

ALL SPOIL MUST BE PLACED

OUTSIDE OF FLOODPLAIN.

C3-10

2-13-2025

24-30402

SITE PLAN

JAT

HPT

CDR

CALHOUN COUNTY IOWA

DIVERTED TILE

SEE SHEET C3-20

PRINCIPAL SPILLWAY

SEE SHEET C3-21

BERM STORAGE AREA

ELEV = 1182.4

SLOTTED RISER

SEE SHEET C3-21

TEMPORARY WORK LIMITS

APPROXIMATE PARCEL

LINE (TYP)

CORRECTED EASEMENT ANNOTATION/ SITE CHARACTERISTIC

TABLE VALUE HLC8-13-2026

GRODAHL FARMS INC

0+001+002+003+004+005+006+00

118611871188

119011911192119311941195119611971198

119611971198

11811183

0+00

.5

.5

0+50

.3

.8

1+00

.5

.1

1+50

.8

.5

2+00

.8

.8

2+50

.6

.2

3+00

.9

.5

3+50

.8

.9

4+00

.0

.2

4+50

.5

.6

5+00

.5

.9

5+50

.3

.3

6+00

.7

.6

6+50

INSTALL 15" CMP

WITH FES & ANIMAL GUARD

20 LF @ 0.69%

STA: 0+00 TO 0+20

INSTALL 12" DUAL WALL HDPE

581 LF @ 0.69%

STA: 0+20 TO 6+01

ST

A

= 0 +0

0.0

EL

EV

.50

ST

A

= 0 +2

0.0

EL

EV

.64

ST

A

= 6 +0

0.9

EL

EV

.65

NOTE:

XXXX.X - EXISTING GROUND L

XXXX.XX - PROPOSED TILE GRADE

C

EXISTING GROUND

NWL=1181.5'

ASTM CLASS 2 BACKFILL

STA: 2+00 TO 4+40

DISSIMILAR PIPE CONNECTION

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C3-PROFILE

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

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2- C

3-

PR

O

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LE

.D

W G

S

AV

ED

B

Y:

J

ES

SE

.C R

U

TC

H

ER

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C3-20

C3-20 INLET PLAN & PROFILE

SCALE IN FEET

50 100

EXISTING 12" HDPE TILE (TYP)

FIELD VERIFY LOCATION AND DEPTH;

CONNECT TO EXISTING TILE AND CAP

DOWNSTREAM, INSTALL 12" CPT @0.69%MIN

OUTLET ELEV = 1182.5

10 TN OF RIPRAP

(SUDAS 9040.110)

SEE SHEET C0-30

C3-20

2-13-2025

24-30402

INLET PLAN &

PROFILE

JAT

HPT

CDR

CALHOUN COUNTY IOWA

GRODAHL FARMS INC

8'

0+001+001+73

118611871188

119011911192119311941195119611971198

11811183

0+00

.9

.0

0+50

.3

.5

1+00

.6

.1

1+50

.7

.7

2+00

.5

INSTALL 12" CMP

WITH FES & ANIMAL GUARD

20 LF @ 1.16%

STA: 0+00 TO 0+20

INSTALL 10" DUAL WALL HDPE

(NON-PERF)

153 LF @ 1.16%

STA: 0+20 TO 1+73

ST

A

= 0 +0

EL

EV

.00

ST

A

= 0 +2

EL

EV

.23

ST

A

= 1 +7

EL

EV

.00

NOTE:

XXXX.X - EXISTING GROUND L

XXXX.XX - PROPOSED TILE GRADE

C

WCS

R=1184.50 I=1177.55 (10'') I=1177.55 (10'')

SLOTTED 18" CMP

RISER

R=1181.00 I=1178.00 (10'')

1183.00

8.0

1178.50

NWL=1181.5'

TRENCH DAM

WATER

LEVEL

04/2024 1176.83

DISSIMILAR PIPE

CONNECTION

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C3-PROFILE

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

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ES

\3

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D \P

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2- C

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R

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C3-21

C3-21 OUTLET PLAN & PROFILE

SCALE IN FEET

50 100

TOP OF BANK (TYP)

INSTALL 5TN CLASS E RIPRAP

(SEE SHEET C0-32)

2-CHAMBER, 10"x6' WATER CONTROL STRUCTURE

WITH 54" DIA CMP SLEEVE WITH GRATED LID

CMP RIM ELEV = 1185.0

SLOTTED 18" CMP RISER

RIM ELEV = 1181.0

INVERT ELEV = 1178.0

SEE SHEET C0-30

TRENCH DAM

SEE SHEET C0-32

C3-21

2-13-2025

24-30402

OUTLET PLAN &

PROFILE

JAT

HPT

CDR

CORRECTED PIPE TO "DUAL WALLED"8-13-2026 HLC

GRODAHL FARMS INC

XXXXXXXX

1178 8'

118811891190

11921193119411951196119711981199120012011202120312041205

82 11

83 11 84 11

85 11 86 11

87 11 88 11

89 11 90 11

1181 1180

11811182

-8:1

-6:

-0.2%

-1.1%

-3.

8%

-2.2%

-4.

1%

-5.

3%

-2.2%

-9.3%

-4:1

-4:1

-6:1

-5:1

-2.

5%

10'

1.9

1.0

1.0

2.5

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C4-GRADE

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

R O

JE

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ID

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B-

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H O

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\3

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ES

\3

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IL

D \P

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2- C

4- G

R

AD

E.

D

W G

S

AV

ED

B

Y:

H

AL

EY

.T O

M S

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C4-10

C4-10 GRADING PLAN

SCALE IN FEET

50 100

CONTAINMENT DIKE

TOP ELEV = 1183.0

6:1 SIDE SLOPES

EDGE OF FIELD (TYP)

TOP OF BANK (TYP)

EXISTING CONTOUR (TYP)

PROPOSED CONTOUR (TYP)

BERM STORAGE AREA

ELEV = 1182.4

NORMAL POOL

ELEV = 1181.5

10' SUBMERGED BERM (TYP)

EXCAVATED AREA

WEST FORK CAMP CREEK

SPOIL WASTING AREA.

C4-10

2-13-2025

24-30402

GRADING PLAN

JAT

HPT

CDR

TEMPORARY WORK LIMITS

GRODAHL FARMS INC

XXXXXXXX

1178 8'

871188

118911901191

1181 1180

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C4-CUTFILL

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

R O

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TS

\3

P R

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0-

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ID

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S

C

AL

B-

C

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H O

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C O

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TY

IA

\3

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F

IL

ES

\3

C

IV

IL

D \P

R O

D U

C

TI

O N

D W

G S\

2- C

4- C

U

TF

IL

L.

D W

G S

AV

ED

B Y:

H

AL

EY

.T

O M

S

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

---- ---- C4-20

C4-20 CUT - FILL

SCALE IN FEET

50 100

CONTAINMENT DIKE

TOP ELEV = 1183.0

6:1 SIDE SLOPES

EDGE OF FIELD (TYP)

TOP OF BANK (TYP)

NORMAL POOL

ELEV = 1181.5

AREA = 2.35 ACRES

10' SUBMERGED BERM (TYP)

EXCAVATED AREA

WEST FORK CAMP CREEK

SPOIL WASTING AREA.

C4-20

2-13-2025

24-30402

CUT - FILL

JAT

HPT

CDR

CALHOUN COUNTY IOWA

LEGEND

SYMBOL DESCRIPTION MINIMUM ELEVATION MAXIMUM ELEVATION VOLUME

AREA OF FILL 0.10 2.67 3,122 CY

BALANCE LINE -0.10 0.10 567 CY

AREA OF CUT -3.18 -0.10 3,089 CY

TOP OF BERM

ELEVATIONTEMPORARY WORK LIMITS

G

RO

DA

HL

F

AR

M S

IN

C

W

IR

TJ

ER

S, P

AT

RI

CI

A

M L

E

X X

X X

8'

1181 1182

0 1 2 3 4 5 5

118111

21179

SE

CT

IO

N

A- A

SE

CT

IO

N

A- A

SECTION A-A

-0+50 0+00

.3

0+50

.6

.1

1+00

.4

.1

1+50

.9

.0

2+00

.0

.9

2+50

.3

.7

3+00

.7

.4

3+50

.7

.1

4+00

.6

.8

4+50

.2

.6

5+00

.4

5+50 6+00

10' 10' 8'

EXISTING GROUND

PROPOSED GROUND

6:1

4:1

6:1

6:14:1

NWL=1181.5'

1181.0'1181.0'

1183.0'

NOTE:

XXX.X - EXISTING GROUND

XXX.XX - PROPOSED GROUND

IDALS

CAL883432B

NUTRIENT

REDUCTION

WETLAND

30402-C4-CROSS SECTION

DATE

REVISION SCHEDULE

DESCRIPTION BY

SHEET

TITLE

PROJECT

WITHOUT PRIOR WRITTEN CONSENT.

INC. AND MAY NOT BE USED, COPIED OR DUPLICATED

THIS DOCUMENT IS THE PROPERTY OF I & S GROUP,

PROJECT NO.

FILE NAME

DESIGNED BY

ORIGINAL ISSUE DATE

DRAWN BY

CLIENT PROJECT NO.

REVIEWED BY

D W

G L

O C

AT

IO

N

S:

\P

R O

JE

C

TS

\3

P R

O J\

0-

9\

ID

AL

S

C

AL

B-

C

AL

H O

U N

C O

U N

TY

IA

\3

P

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D U

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TI

O N

F

IL

ES

\3

C

IV

IL

D \P

R O

D U

C

TI

O N

D W

G S\

2- C

4- C

R O

SS

S

EC

TI

O N

.D W

G S

AV

ED

B Y:

J

ES

SE

.C

R U

TC

H

ER

SHEET NOT VALID UNLESS THIS TEXT IS COLOR.

SCALE IN FEET

50 100

---- ---- C4-30

C4-30

2-13-2025

24-30402

CALHOUN COUNTY IOWA

CROSS SECTION

JAT

HPT

CDR

WES

T F

ORK C

AM

P C

REE

K

Attachment No. 3

Revised Technical Specifications Booklet

CAL883432B COUNTY WETLAND PROJECT

CAL883432B - BID NO. 26-08

PREBID MEETING

August 12, 2026 - 10:00 AM

Calhoun County Conservation, 905 W High St, Rockwell City

Opening date and time: Wednesday, August 26, 2026, beginning at 3:00 PM

Tracy Blocker, Division of Soil Conservation and Water Quality (Division) opened the meeting.

A) Introductions

Luke Arpenter, ISG Jesse Crutcher, ISG Owen Oeltjenbruns, ISG Mark Hungate, ISG Zach Mercer, ISG Sara Smith, IDALS Tracy Blocker, IDALS Jeff Grodahl, landowner Jim Frederick Ty Fittje, Rise Up Construction

• There are three projects being bid at this time:

1. This one

2. One in Hardin

3. One in Floyd

• This wetland project is funded as part of the Water Quality Initiative that is being used to help implement the Iowa Nutrient Reduction Strategy.

A) Bidding

1. Time of Completion:

a) All work except for seeding: June 15, 2027

b) STRUCTURE seeding: 09/15/2027

c) BUFFER seeding: 06/30/2027

d) Note seedings must be done in the seeding window as specified in the Construction

Specification IA-006 Seeding and Mulching for Protective Cover.

2. Liquidated Damages:

a) There are liquidated damages provisions in the contract, absent a No-Fault

Extension.

b) All work except for seeding - damages $175 per day

c) Structure seeding - damages $125 per day

d) Buffer seeding - damages $125 per day

3. Taxes:

No sales tax for materials purchased

4. Measurement and Payment:

a) Measuring & Calculating: The specifications describe the method to be used in measuring and calculating the payment quantities for each work item

b) Payments will be made on the basis of monthly estimates from the engineer

c) Mobilization will be paid as a percentage of the lump-sum bid amount, prorated based on the percentage of work completed.

d) Materials stored on site; 97% of cost with invoice

e) Payments will be made in amounts equal to ninety-seven percent (97%) of the value of work completed. (In most cases)

5. Method of Bidding:

UNIT PRICE:

a) This is a unit price contract

b) Bidders shall submit unit price for each bid item covered by the specifications.

Prices shall cover complete work and include all costs incidental thereto unless otherwise indicated.

c) The base bid includes all items 1 through 23 Eng / 1 through 24 IMPACS

d) A separate Document CC Schedule of Prices WORKSHEET was provided

e) Any questions that should be considered as part of an addendum must be submitted in writing by August 19, 2026 by 3:00 PM.

f) The Division will make every attempt to issue any necessary addenda no later than the day after the last date for questions. If an addendum is sent, you must acknowledge that you received it on page 2 Document CC Proposal- Acknowledgement-Affidavit

g) Scope of Work: If the Scope of Work changes, this will be addressed with an Amendment or Change Order

6. Submission of Bids, Proposal-Acknolwedgment-Affidavit and Bid Security:

a) Bids must be submitted within IMPACS no later than 3:00 PM 08/26/2026…