IOWA DEPARTMENT OF NATURAL RESOURCES (DNR)

Request for Bid

RFB COVER SHEET

Administrative Information:

TITLE OF RFB: Alum Applications at Silver Lake (Delaware Co.) RFB Number: 26CRDLWBBDODD-0003S

Bureau: Land and Waters Bureau

DNR seeks to purchase:

This contract will include two alum applications at Silver Lake, located in Delaware County, Iowa, to reduce phosphorus concentrations in the lake in an effort to reduce the frequency and intensity of algal blooms at these three lakes.

Number of mos. or yrs. of the initial term of the contract: 1 Year, 3 months Number of possible annual extensions: 1

Tentative Contract term start date: March 1, 2026 Tentative Contract term end date: June 30, 2027

DNR Issuing Officer: Colton Lullmann

Email: Colton.Lullmann@dnr.iowa.gov; Phone: (515) 361-0743

6200 Park Avenue, Suite 200, Des Moines, Iowa 50321

PROCUREMENT TIMETABLE—Event or Action: Date/Time (Central Time):

DNR Issues RFB 1/14/2026

RFB written questions, requests for clarification, and suggested changes from Respondents are due:

1/26/2026 @

11:59 PM

DNR’s written response to RFB questions, requests for clarifications, and suggested changes are due:

1/27/2026 @

4:30 PM

Bid Due Date: 02/04/2026

Bid Due Time: 9:00 AM CST

Anticipated Date to Issue Notice of Intent to Award: 02/05/2026

Anticipated Date to Execute Contract: February 16, 2026

Section 1 Introduction

1.1 Bidder Instructions

All responses must be reviewed prior to submission and are required to be submitted through IMPACS at the following link: https://bids.sciquest.com/apps/Router/PublicEvent?CustomerOrg=DASIowa.

1.2 Purpose

The purpose of this Request for Bid (RFB) is to solicit bids from qualified providers to provide the goods and/or services described further in this RFB to the DNR. The DNR intends to award a contract(s) beginning and ending on the dates listed in this solicitation, and the DNR may extend the contract(s) for up to the number of annual extensions identified in this solicitation at the sole discretion of the DNR. Any contract(s) resulting from the RFB will not be an exclusive contract.

“Responsible Bidder” means a Bidder that has the capability in all respects to perform the requirements of the Contract. In determining whether a Bidder is a Responsible Bidder, the DNR may consider various factors including, but not limited to, the Bidder’s competence and qualifications to provide the goods or services requested, the Bidder’s integrity and reliability, the past performance of the Bidder relative to the quality of the goods or services offered by the Bidder and the best interest of the DNR.

“Responsive Bid” means a Bid that complies with each of the provisions of this RFB, or is either an alternative bid or a bid with an exception, if accepted by the DNR.

mailto:Colton.Lullmann@dnr.iowa.gov https://bids.sciquest.com/apps/Router/PublicEvent?CustomerOrg=DASIowa

1.3 Background Information

This RFB is designed to provide Bidders with the information necessary for the preparation of competitive Bids. The RFB process is for the DNR’s benefit and is intended to provide the DNR with competitive information to assist in the selection process. It is not intended to be comprehensive. Each Bidder is responsible for determining all factors necessary for submission of a comprehensive Bid.

High nutrient loading in Iowa lakes, particularly from phosphorus, has accelerated eutrophication and subsequently degraded water quality, impaired ecological health, and reduced recreational opportunities. As a result, many Iowa lakes experience frequent and widespread algal blooms, diminished water clarity, unpleasant odors, oxygen depletion, and fish kills, which have become common occurrences during the open-water season.

The Lake Restoration Program (LRP) has been working to develop new tools for managing phosphorus in lakes over the past five years, particularly those that are effective at treating internal phosphorus recycling. The LRP first worked with researchers from Iowa State University and the University of Wisconsin – Madison to better understand mechanisms for internal loading in Iowa Lakes (2020-2023 study) and develop strategies for managing different pathways of internal loading.

In 2020, the LRP hired Shive Hattery and Limnotech to investigate restoration alternatives at Silver Lake, a small natural lake located in Delaware County, including a dredging feasibility study and modelling effort to show how different restoration practices (including an alum application) would reduce phosphorus concentrations in the lake.

As a part of this study, sediment cores were collected from the lake bottom to estimate the portion of the total phosphorus load that was attributed to internal loading. Additionally, a watershed model was utilized to determine the amount of phosphorus coming to the lake from the watershed. Silver Lake is a high priority for restoration, and the LRP has been working with the local community over 10 years to stabilize water levels in the lake and implement watershed best management practices to reduce phosphorus loads from the watershed. The study determined that an alum application program was the most cost effective and lowest risk restoration alternative for improving water quality. Silver Lake was re-cored in late 2025 to confirm alum and sodium aluminate quantities needed to develop an accurate dose for inactivating phosphorus being released from the sediments at Silver Lake.

This alum application program, spread over two doses, will help inactivate phosphorus being released from the sediments at Silver Lake and improve overall water clarity and quality.

Section 2 Administrative Information

2.1 Issuing Officer

The Issuing Officer identified in this solicitation is the sole point of contact regarding the RFB from the date of issuance until selection of the successful Bidder.

2.2 Restriction on Communication

From the issue date of this RFB until announcement of the successful Bidder, Bidders may contact only the Issuing Officer. The Issuing Officer will respond only to electronic questions regarding the procurement process. Questions related to the interpretation of this RFB must be submitted as provided in Section 2.3. Oral questions related to the interpretation of this RFB will not be accepted. Bidders may be disqualified if they contact any DNR employee other than the Issuing Officer about the RFB.

The DNR assumes no responsibility for oral representations made by its officers or employees unless such representations are confirmed in writing and incorporated into the RFB through an addendum.

2.3 Questions, Requests for Clarification, and Suggested Changes Bidders are invited to submit written questions and requests for clarifications regarding the RFB. Bidders may also submit suggestions for changes to the specifications of this RFB. The questions, requests for clarifications, or suggestions must be in writing and received by the Issuing Officer on or before the date and time listed on the RFB cover sheet. Oral questions will not be permitted. If the questions, requests for clarifications, or suggestions pertain to a specific section of the RFB, Bidder will reference the page and section number(s). The DNR will send written responses to questions, requests for clarifications, or suggestions received from Respondents on or before the date listed on the RFB cover sheet. The DNR’s written responses will become an addendum to the RFB. If the DNR decides to adopt a suggestion that modifies the RFB, the DNR will issue an addendum to the RFP.

2.4 Amendment to the RFB

The DNR reserves the right to amend the RFB at any time using an addendum. The Bidder will acknowledge receipt of all addenda in its Bid. It is the Bidder’s sole responsibility to check daily for addenda to posted documents.

2.5 Submission of Bids

The DNR must receive the Bid before the “Bids Due” date and time via IMPACS. This is a mandatory requirement and will not be waived by the DNR. Any Bid received after this deadline will not be accepted. It is the Bidder’s responsibility to ensure the bid is received prior to the deadline.

2.6 Costs of Preparing the Bid

The costs of preparation and delivery of the Bid are solely the responsibility of the Bidder.

2.7 No Commitment to Contract

The DNR reserves the right to reject any or all Bids received in response to this RFB, cancel this RFB, or advertise a new RFB at any time prior to the execution of the Contract. Issuance of this RFB in no way constitutes a commitment by the DNR to award a contract.

2.8 Nonmaterial Variances

The DNR reserves the right to determine whether a Bid substantially complies with the requirements of this RFB.

Nonmaterial variances are not necessarily disqualifying. The determination of materiality is in the sole discretion of the DNR.

2.9 Public Records and Requests for Confidential Treatment

In order to request confidential treatment, you must comply with the provisions of 561 Iowa Administrative Code chapter 2, which may be found at the following location:

https://www.legis.iowa.gov/law/administrativeRules/agencies. 561 Iowa Administrative Code section 2.5(7) provides that all claims for confidential treatment made to the Iowa Department of Natural Resources must be substantiated in writing with the following information.

1) A statement of all measures the business has taken to protect the confidentiality of the information, and a statement of intent to continue to take such measures;

2) Practices and policies of other businesses, if known, regarding confidentiality of similar information;

3) A statement that the information is not, and has not been, reasonably attainable without the consent of the business by other persons other than government bodies by use of legitimate means;

4) A statement demonstrating that disclosure of the information is likely to cause substantial harm to the business’s competitive position; and

5) A reference to any other determinations of confidential status of the information or similar information.

2.10 Release of Claims

By submitting a Bid, the Bidder agrees that it will not bring any claim or cause of action against the DNR based on any misunderstanding concerning the information provided herein or concerning the DNR's failure, negligent or otherwise, to provide the Bidder with pertinent information in this RFB.

2.11 Evaluation of Bids Submitted

The DNR will evaluate the Responsive Bids submitted by Responsible Bidders to determine the lowest responsible bidder(s) and will award the Contract(s) to the Bidder(s) submitting the lowest responsible bid(s) based on price.

2.12 Award Notice and Acceptance Period

Notice of Intent to Award the Contract(s) will be sent to all Bidders submitting a timely Bid. Negotiation and execution of the Contract(s) will be completed no later than thirty (30) days from the date of the Notice of Intent https://www.legis.iowa.gov/law/administrativeRules/agencies to Award. If the apparent successful Bidder fails to negotiate and deliver an executed contract by that date, the DNR, in its sole discretion, may cancel the award and award the Contract to the remaining Bidder the DNR believes will provide the best value to the DNR.

2.13 No Contract Rights until Execution

Bidders will not acquire any legal or equitable rights regarding the Contract unless and until the Contract has been fully executed by the successful Bidder and the DNR.

Section 3 – Statement of Work and Specifications

Overview The successful Respondent will provide the services to the DNR in accordance with the requirements as provided in this Scope of Work.

3.1 Statement of Work

The Iowa Department of Natural Resources (DNR) is requesting bids for conducting an aluminum sulfate and sodium illuminate treatment of Silver Lake, located in Delaware County. The work includes purchasing, delivering, storing, and applying liquid aluminum sulfate and sodium aluminate to the lake to mitigate the internal release of phosphorus from the sediments. A detailed description of the work is included as Exhibit 1 (Attached) to this RFB and site plans are attached as Exhibit 2.

Statement of Work. Contractor will perform the following Tasks by the Task Milestone Dates set out in the following table:

Deliverables Task Milestone Date

Task 1: Aluminum sulfate (alum) and Sodium Aluminate treatment at Silver Lake (Delaware County) Description: The Contractor shall apply liquid aluminum sulfate as specified in Exhibits 1 and 2 (attached) to Silver Lake, located in Delaware County, Iowa. The work for this Task includes:

● Mobilize and demobilize labor, equipment, and materials, as needed.

● Furnish, deliver, store, and apply liquid aluminum sulfate and liquid sodium aluminate to Silver Lake.

● Maintain and protect boat launches or other land areas used for access to lake and areas used for staging and storage of equipment and materials.

● Utilize dedicated site access for equipment used in chemical application from staging/storage area to water surface.

● Furnish, install, and remove all appropriate signage and buoys (if used) in a timely manner.

● Furnish, install, and remove all appropriate traffic and pedestrian control devices needed for site access and staging.

● Restore all land areas directly or indirectly disturbed by the Work.

The Contractor shall complete the work described above and detailed in Exhibits 1 and A and perform all associated work in accordance with the attached site plans, which is attached to this RFB as Exhibit 2.

The first application must occur between April 1 and May 15, 2026 when favorable conditions are present.

The second application must be completed between April 1 and May 15, 2027, when favorable conditions are present.

3.2 Minimum Bidder Qualifications/Equipment Specifications: The selected service provider shall meet all of the technical specifications, both for equipment, method of application, and chemical specifications as described in Exhibit 1: Silver Lake Aluminum Treatments. Applications shall follow the approach and utilize the staging areas as described in Exhibit 2 (also attached) for each lake.

Section 4 - Insurance

4.1 Insurance

The Contract will require the successful Respondent to maintain insurance coverage(s) in accordance with the insurance provisions of the General Terms and Conditions and of the type and in the minimum amounts set forth below, unless otherwise required by the DNR.

TYPE OF INSURANCE LIMIT AMOUNT

General Liability (including contractual liability) written on an occurrence basis

General Aggregate Products - $2 million

Comp/Op Aggregate $1 Million

Personal injury $1 Million

Each Occurrence $1 Million

Automobile Liability (including contractual liability) written on an occurrence basis

Combined single limit $1 Million

Property Damage Each Occurrence $1 Million

Aggregate $1 Million

Workers Compensation and Employer Liability As Required by Iowa law As required by Iowa law

The Contractor is required to submit certificate of insurance, which indicates coverage and notice provisions as required. The insurer will state in the certificate that no cancellation of the insurance may be made without at least thirty (30) days’ prior to written notice to the DNR. Acceptance of the insurance certificates by the DNR will not act to relieve the Contractor of any obligation under this Contract. It will be the responsibility of Contractor to keep the respective insurance policies and coverages current and in force during the life of this Contract. Contractor will be responsible for all premiums, deductibles and for any inadequacy, absence or limitation of coverage, and the Contractor will have no claim or other recourse against the DNR for any costs or loss attributable to any of the foregoing, all of which will be borne solely by the Contractor. Notwithstanding any other provision of this Contract, Contractor will be fully responsible and liable for meeting and fulfilling all of its obligations under this section of the Contract.

https://dasebid.ionwave.net/Desktop.aspx?pid=259&caid=3&at=19&ret=254&bret=252

Exhibit 1:

Request for Bid

Silver Lake Aluminum Treatments

TECHNICAL SPECIFICATIONS

SILVER LAKE ALUMINUM TREATMENTS

TECHNICAL SPECIFICATIONS

Division 1 General Specifications 01000 Summary of Work 01070 Project Meetings 01080 Submittals 01085 Safety 01095 Closeout Procedures 01100 Mobilization and Demobilization

Division 2 Technical Specifications 02400 Chemical Treatment

EXHIBIT A: Figures

Division 1 – General Specifications

SECTION 01000

SUMMARY OF WORK

The Iowa Department of Natural Resources (Owner) is requesting quotations for conducting an aluminum sulfate and sodium aluminate treatment of Silver Lake in northeastern Iowa. The Work includes purchasing, delivering, storing, and applying liquid aluminum sulfate and sodium aluminate to the lake to mitigate the internal release of phosphorus from lake sediment. The treatment is to occur in two applications, the first application occurring in spring of 2026 and the second in spring of 2027.

The Work (as defined below) includes the two treatment applications with the first application to be completed between April 1, 2026 and May 15, 2026, and the second application between April 1, 2027 and May 15, 2027, unless otherwise approved by the Engineer or Owner. Respondents must complete the Work described herein and perform all associated work in accordance with the attached site plans (Exhibit A) and technical specifications.

The Work includes:

1. Mobilize and demobilize labor, equipment, and materials, as needed.

2. Furnish, deliver, store, and apply liquid aluminum sulfate and liquid sodium aluminate to Silver Lake.

3. Maintain and protect boat launches or other land areas used for access to lake and areas used for staging and storage of equipment and materials.

4. Utilize dedicated site access for equipment used in chemical application from staging/storage area to water surface.

5. Furnish, install, and remove all appropriate signage and buoys (if used) in a timely manner.

6. Furnish, install, and remove all appropriate traffic and pedestrian control devices needed for site access and staging.

7. Restore all land areas directly or indirectly disturbed by the Work.

PART 1: GENERAL

1.01 EXISTING SITE CONDITIONS AND USES

A. Treatment areas, staging areas and site accesses are shown on the figures included in Exhibit A.

B. The Site includes site access areas, staging areas and treatment areas for Silver Lake. Site maps and photos are included in Exhibit A of the Technical Specifications. Launching access to and staging areas adjacent to the lake are as follows.

1. Access to Silver Lake is through the boat ramp located off Lake Street in the southwest corner of the lake. The ramp contains a gravel parking area with ample space for a vehicle/trailer turnaround to allow full length backing of equipment. Vehicles and equipment used for launching must be promptly removed from launch access or stored so as not to inhibit access for the public.

2. Staging can occur at the intersection of Peters Drive and Pioneers Road. All staging must maintain an open access to the public with only limited access interruptions. All staging areas must be secured to provide public safety.

C. Contractor shall acknowledge and abide by Seasonal Load Limits set by the Iowa Department of Transportation and other road authorities.

1.03 WORK

A. The overall scope of the Work includes, but is not necessarily limited to, furnishing all labor, tools, equipment, and materials necessary to:

1. Mobilize and demobilize labor, equipment, and materials, as needed.

2. Furnish, deliver, store, and simultaneously apply liquid aluminum sulfate and liquid sodium aluminate to Silver Lake, as described herein.

3. Obtain required roadway and right of way permits from road authorities as needed.

3. Maintain and protect public and private property used for access to lake and areas used for staging and storage of equipment and materials. This includes proper armoring of curbs, stormwater manholes, pavement, and vegetation as necessary.

4. Furnish, install and remove all appropriate signage and buoys (if used) in a timely manner.

5. Provide sufficient access to lake for vessels, staging, and associated equipment needed for chemical treatment. Where shallow water conditions and dense vegetation exist along the shoreline at the access location, appropriate mobilization equipment for access such as swamp mats, planks, or other measures shall be utilized. Access to the lake is incidental to the Work. A site access plan from the contractor shall be provided prior to commencement of work (included in contractor workplan).

6. Furnish, install, and remove all appropriate traffic control and pedestrian control devices needed for site access and staging.

7. Restore all land areas directly or indirectly disturbed by the Work to pre-project condition including but not limited to regrading of disturbed land, reseeding of exposed areas, cleaning all debris left on site. Site restoration is incidental to the Work.

B. Should there be some item or items not shown in Exhibit A or not described in these Specifications which are required for the Work, those items and the furnishing of all labor, materials, and equipment shall be considered incidental to the Work and no additional compensation will be provided.

C. The Work includes the furnishing of all labor, equipment, tools, machinery, materials, and other items required for chemical treatment of Silver Lake as specified. Equipment furnished shall be in safe operating condition and of adequate size, capacity, and condition for the performance of the Work.

D. Contractor shall be solely responsible for the coordination of its activities regarding the Work with the activities of Subcontractors.

1.05 OWNER FURNISHED PRODUCTS

A. Owner will not furnish any products for this Project.

1.06 CONTRACTOR USE OF PREMISES

A. Definition of Site: The Site is defined as the site access areas, staging areas and treatment areas, as shown on the figures included in Exhibit A. The Contractor shall limit ingress/egress and operations, including materials and equipment staging storage, to the lake, site access areas, staging areas, and adjacent right-of-way necessary to access the treatment areas as shown in Exhibit A, which is the area over which Owner will obtain the necessary access and use rights. Any disturbance inside the project limits to existing facilities, site grading, pavements, sidewalks, and/or vegetation and outside the project limits must be fully restored by the Contractor at the Contractor's expense. Contractor must coordinate and finalize staging areas with the Owner or their appointed representative prior to beginning the Work.

B. Hours of Operation: Contractor will ascertain hours approved by the Iowa Department of Natural Resources for conduct of the Work and limit conduct of operations in accordance with same and all other local laws and regulations.

C. Unfavorable Treatment Conditions: See Technical Specification 02400 Part 3.

1.07 SEQUENCE OF WORK

A. The aluminum applications must be conducted such that the spring 2026 application is completed when favorable conditions are present between April 1, 2026, and May 15, 2026, and the spring 2027 application is completed when favorable conditions are present between April 1, 2027, and May 15, 2027.

B. Contractor shall determine the sequence of Work required to efficiently progress with the Work.

SECTION 01070

PROJECT MEETINGS

1.01 TREATMENT PLANNING CONFERENCE

A. After Owner notifies Contractor of selection to complete the Work, Owner or their appointed representative will schedule a treatment planning meeting that shall be attended by Owner, Contractor, Engineer, and others as may be invited by Owner or Engineer. The meeting will be scheduled as far in advance of the date the Work is to start as is practical.

B. Agenda items may include:

1. Designation of responsible personnel for all parties, lines of communication, and lines of authority, including Project Contacts (see Paragraph 1.04 of this section).

2. Scope of work and the anticipated schedule of operations

3. Critical work sequencing

4. Aluminum storage location and site access for aluminum distribution to barge or boat

5. Spill Response Procedures

6. Record documents and reporting

7. Site safety and security procedures

8. List of major subcontractors

9. Procedures for processing change orders

10. Use of premises including equipment and material storage

11. Materials deliveries

12. Housekeeping procedures

1.02 PROGRESS PHONE CALLS

A. Progress phone calls may be scheduled by the Owner or their appointed representative as needed at a time mutually agreeable to the Contractor and Owner. A preferred time for these calls is prior to Contractor's submittal of Application for Payment.

B. Following each phone call, the Owner or their appointed representative will prepare and distribute to Owner and Contractor copies of the notes of the phone call. These will include a brief summary of the progress of the Work since the previous phone call.

1.03 UNSCHEDULED MEETINGS

A. The Contractor shall attend other unscheduled meetings which may be reasonably requested by Owner to discuss unanticipated changes in the Work, or conditions at the site, or other issues and which must be resolved before progression of work.

1.04 PROJECT CONTACTS

A. Contractor shall submit to Owner or their appointed representative the name of personnel available for ongoing technical support and who are familiar with the Project and are responsible for its completion.

B. The list should include name(s), functional title(s), mailing address(es), phone number(s) and email address(es).

C. At least two phone numbers shall be furnished which will provide 24-hour answering by a competent technical representative of Contractor in the event of an emergency or other unanticipated condition requiring immediate attention. At least one person shall be available at all times for immediate response to the site within 2 hours of being called. The responding person shall be the Contractor's representative at the Site and shall have authority to act on behalf of Contractor.

PART 2: PRODUCTS [NOT USED]

PART 3: EXECUTION [NOT USED]

END OF SECTION 01070

SECTION 01080

SUBMITTALS

1.01 GENERAL SUBMITTAL PROCEDURES

A. Contractor shall:

1. Transmit each submittal labeled with the Project name, name of the submittal, and section and page number of these specifications in which the submittal was required.

Indicate the type or purpose of the submittal as more fully described elsewhere in this section with regard to the Schedule of Submittals. Transmit the correct number of copies as described below for each type of submittal. Each submittal shall be accompanied by a transmittal letter stating the same information.

2. Transmit all submittals to Engineer via email or at the address set forth in the Request for Proposals and to the attention of the designated by the Owner or their appointed representative.

3. Apply Contractor’s stamp, signed or initialed certifying that review and coordination of information is in accordance with the requirements of the Work and Technical specifications. Unstamped or unsigned submittals will be returned without action.

4. Schedule submittals to expedite Project and in accordance with the Schedule of Submittals to be prepared by Contractor. Coordinate submission of related items.

5. Identify all variations or deviations from the Technical specifications and identify alternative products or system limitations which may be detrimental to successful performance of the completed Work.

6. Provide space for Owner or their appointed representative review stamps and comments on all submittals.

7. Revise and resubmit submittals as required in a timely manner. Identify all changes made since previous submittal.

8. Promptly distribute copies of reviewed submittals to Subcontractors, suppliers, and other concerned parties. Instruct parties to promptly report any inability to comply with provisions.

9. Do not proceed with any Work requiring a submittal, including resubmittal, to Engineer until the submittal has been returned to Contractor without a requirement for resubmittal.

B. All submittals that are made that are not specifically required by the technical specifications will be returned without action.

C. All submittals shall come from the Contractor and submittals directly from Subcontractors or vendors will be returned without action.

1.02 PROGRESS SCHEDULE

A. Contractor shall submit an estimated progress schedule and a finalized progress schedule prior to the notice of award.

B. The Contractor shall revise the finalized progress schedule from time to time, as may reasonably be requested by Engineer or Owner, to reflect the current status and progress of the Work and the operations necessary to complete the Work as required.

C. The progress schedule shall clearly illustrate the sequence of the Work (by locations and other factors as may be appropriate) to be followed by Contractor to efficiently progress with the Work.

1.03 REVIEW OF SUBMITTALS

A. The Owner or their appointed representative’s review of engineering data will cover only general conformity of the data to the technical specifications, external connections, and interfaces with equipment and materials furnished under separate specifications. The review does not indicate a thorough review of all dimensions, quantities, and details of the equipment, material, device, or item indicated or the accuracy of the information or documentation submitted; nor shall review or approval by the Owner or their appointed representative be construed as relieving the Contractor from any and all responsibility for errors or deviations from the requirements of the technical specifications.

B. All engineering data submitted, after final processing by the Engineer shall become a part of the Technical specifications and the work indicated or described thereby shall be performed in conformity therewith unless otherwise required by the Owner.

1.04 SUBMITTAL FOR INFORMATION OR DOCUMENTATION

A. Submit one copy to Owner.

B. Submittal shall be made at least 10 calendar days before the subject of the submittal is to be incorporated into the Work.

C. Submittal is for the purpose of formal verification that the subject of the submittal conforms to the requirements of the Specifications, for formal documentation of the Work, or both.

1.05 SUBMITTAL FOR REVIEW

A. Submit two copies to Owner.

B. Submittal shall be made at least calendar 10 days before the subject of the submittal is to be incorporated into the Work. Owner or their appointed representative will respond within 5 calendar days from receipt of submittal.

C. Submittal is for the purpose of providing opportunity to review and comment on the subject of the submittal.

D. Owner or their appointed representative will respond to the submittal either with a list of comments or indicating no comments.

E. If the Owner’s comments indicate a deficiency with respect to the requirement of the Specifications, Contractor shall amend the submittal and resubmit. The Owner will again respond to the resubmittal.

F. If the Owner’s comments are in regards to an issue which based upon the Technical specifications is at Contractor’s discretion, Contractor shall furnish additional information provide justification, and otherwise cooperate in addressing and resolving Engineer’s comments.

G. Contractor shall remain solely responsible for ensuring that the subject of the submittal conforms to the requirements of the Specifications.

1.06 SUBMITTAL FOR APPROVAL

A. Submit two copies to Owner.

B. Submittal shall be made at least 7 calendar days before the subject of the submittal is to be incorporated into the Work. Owner or their appointed representative will respond within 5 calendar days from receipt of submittal.

C. Submittals shall be stamped with Contractor’s approval. Contractor’s stamp shall be a representation that Contractor has assumed full responsibility for determining the submittal requirements and verifying that the subject of the submittal conforms to the requirements of the Specifications. Submittals not bearing Contractor’s stamp will be returned without review or action.

D. Owner or their appointed representative will review, make notations as appropriate, stamp, and return submittals to Contractor. Owner’s stamp and Contractor’s required action are described below:

1. NO EXCEPTIONS TAKEN. Contractor may proceed without further action.

2. RECOMMENDED REVISIONS NOTED. Contractor shall review Engineer’s notations and revise subject of submittal as required to conform to the requirements of the Drawings and Specifications before proceeding with the Work. Resubmittal is not required.

3. RESUBMIT. Contractor shall review notations, revise subject of submittal as required to conform to the requirements of Figure 1 and Figure 2 and the Specifications, and resubmit to Owner for additional action.

4. REVIEW COMPLETE, FURNISH THREE FILE COPIES. Contractor shall furnish the requested number of copies and may proceed without further action.

E. Work may proceed when submittals have been returned marked RECOMMENDED REVISIONS NOTED, provided the work is performed in accordance with the Engineer’s notations, or NO

EXCEPTIONS TAKEN.

1.07 ALTERNATE PRODUCT SUPPORTING DATA

A. If Contractor proposes to use alternate or substitute products, Contractor shall submit written application.

B. Submit two (2) copies of literature, drawings, and any other data necessary to substantiate that proposed substitute is equivalent or equal to the item named, and otherwise meets the conditions established in the Specifications.

C. Do not proceed with product installation or use until written approval by Engineer is received.

1.08 RECORD DOCUMENTS

A. Submit one original copy to Owner and one duplicate to Owner or their appointed representative of all record documents (or clearly legible copies) prior to substantial Completion.

B. Record documents consist of all Drawings, Specifications, Addenda, Change Orders, and Shop Drawings legibly annotated to reflect all changes made during construction.

1.09 BASIS FOR COMPENSATION

A. All costs to comply with the requirements of this section of the Specifications must be considered to be included in the Contract Price and no additional compensation will be provided.

PART 2: PRODUCTS [NOT USED]

END OF SECTION 01080

SECTION 01085

SAFETY

1.01 GENERAL

A. In accordance with generally accepted chemical treatment practices, the Contractor shall be solely and completely responsible for Site conditions and safety procedures and programs for the Work, including safety and health of all persons and property, on those portions of the site affected by or used by Contractor, Contractor's employees, subcontractors, agents, and others during performance of the Work. This requirement will apply continuously and not be limited to normal working hours. Observation of the Work and Contractor's performance by Owner and Engineer is not intended to include review of the adequacy of the Contractor's safety and health procedures and programs on or near the construction site. The Contractor is solely responsible for the protection of property and the safety and health of its employees, Subcontractors, Suppliers, agents and others on or near the Site.

1.02 SAFETY

A. In addition to the requirements of the Contract, the Contractor shall be responsible for:

1. Furnishing Contractor's employees, as well as any subcontractor's and supplier's employees, with all safety equipment and other protection devices needed to comply with Laws and Regulations or accepted safety practices. Spill containment and hazard communications must follow OSHA Hazard Communication Standard 29 CFR 1910.100 and OSHA Standard 1915.173 for toxic liquids.

2. Any safety violation and/or fine that may occur because of any neglect by Contractor, Contractor's employees, Contractor's subcontractors, or any third party under Contractor's supervision or direction. Contractor shall also be responsible for any safety violation and/or fine Owner may incur due to neglect by Contractor, Contractor’s employees, Contractor’s subcontractors, and any third party under Contractor’s supervision or direction at the Site.

3. Contractor shall be responsible for implementing adequate safety requirements for workers, passers-by, both humans and pets, at all times, during both working and nonworking hours, all days and nights, for the duration of the Work.

1.03 HAZARD COMMUNICATION PROGRAMS

A. Contractor shall be responsible for coordinating any exchange of material safety data sheets or other hazard communication information required to be made available to or exchanged between or among employers at the Site in accordance with applicable laws and regulations.

B. Contractor shall be responsible for complying with OSHA Hazard Communication standard 29 CFR 1910.1200 which covers labeling, written hazard communication, training and safety data sheet requirements including all chemical storage on-site.

1.04 EMERGENCIES

A. In emergencies affecting the safety or protection of persons or the Work or property at the Site or adjacent thereto, Contractor is obligated to act to prevent threatened damage, injury, or loss. Contractor shall give Engineer and Iowa Department of Natural Resources prompt written notice if Contractor believes that any significant changes in the Work or variations from the Technical specifications have been caused thereby or are required as a result thereof. If Engineer determines that a change in the Technical specifications is required because of the action taken by Contractor in response to such an emergency, the Engineer will work with the Iowa Department of Natural Resources to determine is a change order warranted.

1.05 BASIS FOR COMPENSATION

A. All costs to comply with the requirements of this section of the Specifications shall be considered to be included in the Cost Proposal and no additional compensation will be provided.

END OF SECTION 01085

SECTION 01095

CLOSEOUT PROCEDURES

1.01 RECORD DOCUMENTS

A. The Contractor shall maintain at the Site (or in Contractor's possession) one set of record documents including all Drawings, Specifications, and Change Orders in good condition and legibly annotated to show changes made during construction. Store record documents separate from documents used for construction, clearly mark, and make accessible to the Owner at all times.

B. Record information on record documents concurrent with treatment progress. Owner or their appointed representative may require Contractor to improve its performance with regard to recording information during the treatment process.

C. Submit record documents and other submittals required by other sections of these Specifications.

1.02 CLEANUP

A. The Contractor must keep the premises free from accumulations of waste materials, rubbish and other debris resulting from the Work, and at the completion of the Work, must remove all waste materials, rubbish and debris from the premises as well as all tools, treatment equipment, all traffic control devices, and surplus materials. Contractor must leave the site clean. Contractor is responsible for restoring the site to pre-construction conditions. This includes but is not limited to regrading of disturbed land reseeding of exposed areas, and cleaning all debris left on site. Reseeding and stabilization of exposed areas should include the appropriate seed mix, seeding methods, seed bed preparation, and erosion prevention as approved by the Owner or their appointed representative prior to restoration. Site restoration must be completed within 2 weeks after application is complete and contractor demobilizes application and staging equipment.

1.03 GUARANTIES AND WARRANTIES

A. The Contractor must guarantee all work and material against all defects and as otherwise required for specific items in these Specifications.

1.04 FINAL SUBMITTALS

A. Contractor shall complete all submittals required by these Technical specifications prior to the payment of Contractor's Final Application for Payment by Owner.

B. Contractor will maintain all records pertaining to fees or costs incurred in connection with the contract for six years from the date of completion of the work. Contractor agrees that any authorized representative of Owner or the state auditor may have access to and the right to examine, audit and copy any such records during normal business hours.

C. When the Work has been completed, the Owner or their appointed representative will prepare a final statement showing the accepted quantities of every item of work performed by the Contractor. All estimates upon which previous payments have been based are subject to correction in the final statement. The final voucher, showing the accepted quantity and value of each item of work performed and all amounts to be retained or deducted under the provisions of the Contract, will be submitted to the Contractor for approval before being passed for payment.

1.05 BASIS FOR COMPENSATION

A. All costs to comply with the requirements of this section of the Specifications shall be considered to be included in the Cost Proposal and no additional compensation will be provided.

END OF SECTION 01095

SECTION 01100

MOBILIZATION AND DEMOBILIZATION

1.01 MOBILIZATION/DEMOBILIZATION

A. The Work covered by mobilization/demobilization consists of, but is not limited to furnishing all labor, equipment, and materials, and performing all operations necessary to move personnel, equipment, supplies, and incidentals to the project site to establish and maintain project materials and equipment storage areas, parking areas, and other areas necessary for the Work; provide public convenience and safety, barricades, lights and warning signals for traffic control; provide water and chemical tracking control; perform all work that must be completed before beginning work on the project for which payment is not provided elsewhere in these Specifications; all site restoration and erosion prevention; remove all equipment, materials and labor from the project site after it is no longer necessary and restore the Work area; furnish all bonds and insurance certificates obtained specifically for this project, all in accordance with the Technical Specifications, and in compliance with all requirements of Division 1 of these Specifications.

END OF SECTION 01100

Division 2 – Technical Specifications

SECTION 02400

CHEMICAL TREATMENT

1.01 DESCRIPTION

A. All Work included in this section shall be performed in accordance with the following paragraphs, the General Requirements set forth in Division 1 of these Specifications.

B. Work covered by this section includes furnishing all supervision, labor, materials, and equipment required to supply, deliver, store, and apply aluminum (as aluminum sulfate and sodium aluminate, as specified) to the lake, as shown in the Figures included in Exhibit A.

The Contractor shall:

1. Furnish, deliver, store and simultaneously apply liquid aluminum sulfate and liquid sodium aluminate to the lake to mitigate the internal release of phosphorus from the lake sediment.

2. Treat at appropriate weather and temperature conditions as directed by the Engineer.

3. Furnish, install and remove all appropriate signage and buoys (if used) in a timely manner.

4. Restore all areas or features directly or indirectly disturbed by the Contractor.

5. All other Work required for a completion of the aluminum treatment as a project whole.

1.02 REFERENCES

A. AWWA B403-88 American Water Works Association Standard for Aluminum Sulfate.

B. AWWA B405-06 American Water Works Association Standard for Sodium Aluminate.

1.03 SEQUENCE OF WORK

A. The Contractor shall be responsible for all labor, aluminum sulfate, and sodium aluminate, aluminum application equipment and arrangements for the timely delivery of aluminum sulfate and sodium aluminate required to complete the project in the timeline specified.

1.04 SUBMITTALS

A. The contractor shall submit a detailed Workplan to the Owner and Engineer for review prior to beginning Work on the Project. The Workplan must include the following information.

1. Contractor contact information and responsible personnel.

2. A spill prevention and contingency plan including delivery and storage of liquid chemicals and appropriate BMPs for chemical spills and leaks. Secondary spill containment must be provided for all on site chemical storage.

3. Application details including an overview of the application, delivery, dose, and zones.

4. Certificate(s) indicating all materials meet requirements of these Specifications before treatment occurs. The Contractor shall submit the item, applicable reference specification, class, type, manufacturer, and distributor.

5. The results of aluminum sulfate and sodium aluminate lot testing of materials delivered to the site, including an analysis of the metals content of the material, before treatment.

6. Daily Jar test results. A jar test must be conducted each morning prior to application to evaluate pH impacts from the chemical application. Tests should be conducted on a minimum of 20 gallons of water with the specified dose rate in the application.

7. Real time pH testing at the surface and at depth and monitoring plan.

B. The Contractor must submit GPS coordinates and corresponding application rates and amounts of aluminum sulfate and sodium aluminate applied to the lake. This data must be collected by the Contractor in real-time during the application and submitted to Owner or their appointed representative on a daily basis. The submittal must include raw GPS data and a map of the application area.

PART 2: PRODUCTS

2.01 CHEMICALS

A Aluminum Sulfate (Alum)

1. Liquid aluminum sulfate supplied must meet the requirements of American Water Works Association (AWWA) B403-88. The liquid aluminum sulfate [Al2(SO4)3•14.3(H2O)] shall be of commercial grade appropriate for the application with an aluminum content of approximately 4.4% Al+3 (Aluminum) by weight.

B Sodium Aluminate

1. Liquid sodium aluminate supplied must meet the requirements of AWWA B405-06.

The sodium aluminate [Na2Al204] shall be of commercial grade appropriate for the application with an aluminum content of approximately 10.4% Al+3 (Aluminum) by weight.

PART 3: EXECUTION

3.01 DELIVERY, STORAGE AND HANDLING

A. The Contractor shall provide the name and location of the proposed chemical supplier, and will be responsible for all coordination with the aluminum supplier necessary to ensure timely delivery to the project site. The Contractor shall confine all storage of equipment and materials within the staging areas as shown in the figures in Exhibit A and otherwise in a safe, secure and environmentally sound manner. If gradual off-loading is required, the contractor shall be responsible for all demurrage charges.

B. The Contractor shall provide notice to Owner of delivery of equipment and materials 5 calendar days prior to the delivery date.

C. The Contractor shall maintain a copy of the spill prevention and spill contingency plan described on site for the duration of the project.

3.02 UNFAVORABLE TREATMENT CONDITIONS

A. Application of chemical shall not occur if water levels in the lakes are too low, to be determined by the Owner or their appointed representative.

B. Application of aluminum shall not occur when wind speeds directly above the lake surface exceed 20 miles per hour.

C. Treatment will cease and all personnel will leave the water when thunder and/or lightening are observed within a 10-mile radius of the lake. Treatment can resume 30 minutes after the last sound of thunder or lightening flash.

D. Application of aluminum shall not occur if lake water temperatures drop below 45o F.

E. No portion of the Work shall occur under conditions which would adversely affect the quality of the Work, unless special means or precautions, approved by the Owner or their appointed representative, are taken to perform the Work in a proper and satisfactory manner.

F. Application of aluminum shall not occur if it can be reasonably expected (forecast) that a significant precipitation event (greater than 0.5-inch in 24 hours) occurs during treatment period; or if the event is forecasted to begin within 24 hours after treatment completion; or as otherwise advised by Owner or their appointed representative.

G. Engineer may advise that conditions are unsuitable for aluminum application, Contractor will cease application immediately. When Engineer thereafter advises Contractor that conditions are again suitable; Contractor shall recommence application no later than the second calendar day after the receipt of the notice.

3.03 LOCATION OF WORK

A. See Exhibit A.

3.04 ALUMINUM APPLICATION

A. The Contractor shall conduct the aluminum application utilizing a boat or similar vessel with an injection system that controls application volume as function of the prescribed dose, speed, and location of the vessel. The boat or vessel must be capable of uniform and simultaneous application of liquid chemicals. Aluminum application shall be made to the indicated treatment area of the lake, as shown in the figures included in Exhibit A. The treatment areas for each zone of Silver Lake are as follows.

1. North Zone: Areas with a water depth of 5 feet or greater, covering approximately 13.6 acres (aluminum sulfate and sodium aluminate)

2. South Zone: Areas with a water depth of 5 feet or greater, covering approximately 14.3 acres (aluminum sulfate and sodium aluminate)

B. The contractor shall ensure that commercial grade liquid aluminum sulfate [Al2(SO4)3] and sodium aluminate [Na2Al2O4] are evenly and simultaneously applied to the lake at a 2:1 ratio (gallon/gallon) of liquid aluminum sulfate to liquid sodium aluminate. The applications will occur with the following parameters for each application (Figure 1 in Exhibit A):

1. For each Spring 2026 and 2027 treatments

i. (North Zone): The treatment area is 13.6 acres. Each spring treatment includes applying 722 gallons/acre of aluminum sulfate and 357 gallons/acre of sodium aluminate simultaneously.