27CRDLWBMBALM-0001 - RFQ FOR IMPACS.pdf

IOWA DEPARTMENT OF NATURAL RESOURCES (DNR)

Request for Quote - Informal

RFQ COVER SHEET

Administrative Information:

TITLE OF RFQ: Alum Applications at Casey Lake (Tama Co.) RFQ Number: 27CRDLWBMBALM-0001

Bureau: Land and Waters Bureau

DNR seeks to purchase:

This contract will include two alum applications at Casey Lake, located in Tama 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: 0 Year, 6 months Number of possible annual extensions: 1

Tentative Contract term start date:

September 1, 2026 Tentative Contract term end date: February 28, 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 RFQ 7/9/2026 @ 5:00PM CST

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

7/22/2026 @

11:59PM CST

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

7/24/2026 @

4:30PM CST

Quotes Due Date: 7/29/2026

Quotes Due Time: 11:00 AM

Anticipated Date to Issue Notice of Intent to Award: 7/31/2026

Anticipated Date to Execute Contract: 8/13/2026

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 Quote (RFQ) is to solicit bids from qualified providers to provide the goods and/or services described further in this RFQ 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 RFQ 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 RFQ, 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 RFQ is designed to provide Bidders with the information necessary for the preparation of competitive Bids.

The RFQ 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.

Casey Lake is a 38-acre lake in a 748-acre watershed, with most of the watershed located within the 723-acre Hickory Hills Park. The lake was constructed in 1970, coinciding with the overall development of the park. Hickory Hills Park provides recreational opportunities to the public including: camping, cabins, fishing, electric only boating, hunting, scenic grass trails, animal exhibits, and shelters. The park is located in Tama County, but is owned and managed by the Black Hawk County Conservation Board (BHCCB).

Frequent and pervasive algal blooms, low water transparency, noxious odors, depletion of oxygen, and fish kills have been observed and are even common in Iowa lake systems during the open water season. The Lake Restoration Program (LRP) has been working to develop new tools for managing phosphorus in lakes, particularly those that are effective at treating internal phosphorus recycling. In 2021, DNR and BHCCB hired Shive Hattery to evaluate existing watershed BMPs within the park and develop a lake restoration plan, 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. In 2026, watershed BMPs and in-lake restoration practices were completed and the lake refilled. Shive Hattery was also tasked with incorporating post-dredging sediment coring and analysis into technical specifications and an alum dosing plan (chemical inactivation of phosphorus) for the lake and three forebays. This is the final step in the ongoing lake restoration project at this lake. An alum application is needed to help reduce internal nutrient recycling in the lake and limit algae blooms in the lake -ultimately improving water quality and recreational opportunities.

This alum application will help inactivate phosphorus being released from the sediments at Casey 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 RFQ from the date of issuance until selection of the successful Bidder.

2.2 Restriction on Communication

From the issue date of this RFQ 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 RFQ must be submitted as provided in Section 2.3. Oral questions related to the interpretation of this RFQ will not be accepted. Bidders may be disqualified if they contact any DNR employee other than the Issuing Officer about the RFQ.

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 RFQ 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 RFQ. Bidders may also submit suggestions for changes to the specifications of this RFQ. 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 RFQ cover sheet. Oral questions will not be permitted. If the questions, requests for clarifications, or suggestions pertain to a specific section of the RFQ, 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 RFQ cover sheet. The DNR’s written responses will become an addendum to the RFQ. If the DNR decides to adopt a suggestion that modifies the RFQ, the DNR will issue an addendum to the RFP.

2.4 Amendment to the RFQ

The DNR reserves the right to amend the RFQ 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 RFQ, cancel this RFQ, or advertise a new RFQ at any time prior to the execution of the Contract. Issuance of this RFQ 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 RFQ.

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

https://www.legis.iowa.gov/law/administrativeRules/agencies

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 RFQ.

2.11 Evaluation of Quotes 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 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 quotes for conducting an aluminum sulfate and sodium illuminate treatment of Casey Lake, located within Hickory Hills Park, in Tama County, Iowa. While the park is located within Tama County, the park is owned and managed by the Black Hawk County Conservation Board. 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 RFQ 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 Casey Lake (Tama County) Description: The Contractor shall apply liquid aluminum sulfate as specified in Exhibits 1 and 2 (attached) to Casey Lake, located in Tama 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 Casey 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 first application must occur between September 1 and October 31, 2026 when favorable conditions are present.

Deliverables Task Milestone Date

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 RFQ as Exhibit 2.

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: Casey 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.

Black Hawk County Conservation Board Minimum Insurance Requirements

A. At all times during the contract/agreement the outside party will carry and maintain, at the outside party’s expense, the following insurance:

1. Commercial General Liability Insurance Policy, including but not limited to, insurance for premises construction operations (when applicable), contractual liability, completed operations with respect to liability arising out of the ownership, use, occupancy, or maintenance of the premises and all areas appurtenant, thereto, to afford protection with respect to bodily injury, personal injury, death or property damage of not less than One Million Dollars ($1,000,000) per occurrence combined single limit/Two Million Dollars ($2,000,000) general aggregate.

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

2. Umbrella Liability Policy – The County requires liability limits of $1,000,000 as determined through collaboration with the County Attorney and the Risk Assessment Manager.

3. Automobile Liability Insurance Policy with limits for each occurrence of not less than One Million Dollars ($1,000,000) Combined Single Limit with respect to bodily injury, property damage or death.

4. Workers Compensation Insurance Policy or similar insurance in form and amounts required by law.

B. Should the bid require professional service elements (e.g. architectural, engineering, technology, software, health care, legal or professional system designs), the outside party may be required to carry professional errors and omissions coverage with a limit for each claim of not less than One Million Dollars ($1,000,000).

C. Coverage must be maintained by a financially stable carrier with a minimum AM Best rating of A-. It will be the outside party’s responsibility to provide proof of its carrier’s rating.

D. The outside party shall agree to the following:

1. Black Hawk County will be named as an additional insured, on a primary and non-contributory basis, with respect to all general, automobile, and umbrella insurance policies and each such carrier will provide a waiver or subrogation in favor of Black Hawk County.

2. Should the project require electronic communications, storage, records, or record-keeping (including, but not limited to, email, web-based interface usage, electronically stored records or designs, or other electronic or online communications), Black Hawk County will require a Cyber Liability Insurance Policy with limits not less than One Million Dollars ($1,000,000) per occurrence and Black Hawk County will be listed as additional insured.

3. Should the project require removal, cleanup, installation, or other disturbance of hazardous substances, Black Hawk County will require an Environmental/Pollution Insurance Policy with limits not less than One Million Dollars ($1,000,000) per occurrence and Black Hawk County will be listed as additional insured.

4. Certificate of insurance will be submitted to the Board of Supervisors’ Office prior to commencement of the contract/agreement and shall include the thirty-day notice of cancellation provision. If the outside party fails to perform any of its obligations under the County’s Insurance and Policy Requirements, Black Hawk County reserves the right to either purchase the required insurance coverage and assess the cost directly to the outside party, or to declare the outside party’s bid invalid.

5. Hold Harmless Agreement – The outside party shall indemnify and hold harmless Black Hawk County, its agents, and employees from and against all claims, damages, losses, and expenses including attorneys’ fees arising out of or resulting from the performance of work, provided that any such claim, damage, loss or expense:

a. is attributable to bodily injury, sickness, disease or death, or to the damage to or destruction of tangible property (other than the work itself) including the loss of use resulting therefrom, and

b. is caused in whole or in party by any negligent act or omission of the outside party or its subcontractor, anyone directly or indirectly employed by any of them or anyone for whose acts any of them may be liable regardless of whether or not it is caused in part by a party indemnified hereunder.

SECTION 02 10 00

CASEY LAKE WATER ALUM TREATMENT

PART 1: GENERAL

1.01 DESCRIPTION

A. The aluminum treatment project is to apply aluminum (both aluminum sulfate and sodium aluminate) to Casey Lake to inactivate sediment phosphorus and to reduce internal phosphorus loading. All Work included in this section shall be performed in accordance with the following paragraphs, the General Requirements set forth in these Specifications, and the provisions of the other Contract Documents.

B. Work covered by this section includes furnishing all supervision, labor, materials, and equipment required to supply, deliver, store, and apply aluminum (both aluminum sulfate and sodium aluminate) to Casey Lake, as shown on Sheets C000 and C101. The Contractor shall:

1. Furnish, deliver, store and apply liquid aluminum sulfate and liquid sodium aluminate (collectively referred to as aluminum) to Casey Lake to mitigate the internal release of phosphorus from the lake sediment.

2. Treat at appropriate weather, temperature, and flow 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 directly or indirectly disturbed by the Work.

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

C. Access

Access to Casey Lake and application staging areas are located in the Archer’s Shelter Parking Area and Public Boat Launch. (C101 SITE PLAN)

Black Hawk County Conservation (BHCC) provided permission for the use of Casey Lake Public Boat Ramp as outlined in these specifications. All staging or operations that differ from those outlined in these specifications must be approved by BHCC.

D. Attachments

1. C000 COVER SHEET

2. C101 SITE PLAN

Exhibit 1: 27CRDLWBMBALM-0001

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. Aluminum treatment shall not begin until chemical applicator (Contractor) is approved by the ENGINEER. Treatment is to occur between September 1 and October 31, 2026. Preferred application timing is Monday through Thursday with Friday application occurring if necessary.

B. The Contractor shall be responsible for all labor, aluminum sulfate and sodium aluminate, application equipment and arrangements for the timely delivery of aluminum sulfate and sodium aluminate required to complete the project. This shall include: a) GPS-linked computer system for barge (boat) guidance that is integrated with real-time bathymetric measurements and simultaneous chemical dosing control for both aluminum sulfate and sodium aluminate pumping rates, b) treatment barge (boat) with on-board chemical storage tanks, and c) boom applicator for even chemical distribution of chemicals.

C. Application of aluminum sulfate shall not occur if it can be reasonably expected that the surface temperature of Casey Lake will drop below 40º F within 24 hours after treatment completion. Once alum application is started the Contractor has seven (7) calendar days to complete the treatment to ensure application effectiveness.

1.04 SUBMITTALS

A. The Contractor shall submit 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. The Contractor shall also submit 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.

B. The Contractor shall submit GPS coordinates and corresponding application rates and amounts of aluminum sulfate and sodium aluminate applied to the lake. This data shall be collected by the Contractor in real-time during the application and submitted to the Engineer on a daily basis.

C. The Contractor shall submit a Plan of Work for approval by the Engineer prior to the start of work. The Plan of work shall include, at a minimum, the following items:

1. Description of the temporary lakeshore chemical storage facilities including a spill prevention, control and contingency plan (SPCC Plan). Provide manufacturer’s model number and material type for aluminum sulfate and sodium aluminate storage tanks.

2. Method of chemical distribution documenting the computer control of chemical pumping rate into the lake based on application vessel speed, real-time GPS navigation, bathymetric measurements to ensure the dose in Table 1:

Table 1: Buffered Alum Treatment Dose

Waterbody Aluminum Sulfate (gal)

Sodium Aluminate (gal) Figure

Casey Lake Application 23,845 11,923 C101

3. Explanation of navigational guidance system detailing real-time GPS linked computer system for barge (boat) guidance and chemical metering control to ensure complete and uniform chemical coverage during application to the lake.

4. Explanation of application method, equipment, and chemical metering control to ensure complete and uniform chemical coverage during application to the three forebays.

5. Description of all backup systems to minimize down time.

6. Description of land-to-vessel chemical transfer method.

7. Anticipated treatment capacity (acre/hour or gallons/day).

8. Plan for adjusting application procedures or taking other steps to respond to unfavorable lake pH or other adverse occurrence during application.

1.05 BASIS FOR COMPENSATION

A. Compensation for all Work covered under this section of these Specifications shall be in accordance with the provisions set forth in Section 01 20 00, Price and Payment Procedures.

PART 2: PRODUCTS

2.01 CHEMICALS

A Aluminum Sulfate (Alum)

1. Liquid aluminum sulfate supplied shall meet the requirements of 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 4.4% Al+3 (Aluminum) by weight.

B Sodium Aluminate

1. Sodium aluminate supplied shall 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 10.4% Al3+ (Aluminum) by weight.

C The aluminum solutions supplied under this standard shall contain no soluble mineral or organic substances in quantities capable of producing deleterious or injurious effects on public health or water quality.

PART 3: EXECUTION

3.01 DELIVERY, STORAGE AND HANDLING

A. The Contractor shall provide the name and location of the proposed chemical supplier with the Bid and will be responsible for all coordination with the aluminum supplier necessary to insure timely delivery to the project site. The Contractor shall confine all storage of equipment and materials within the Project Limits and otherwise in a safe, secure and environmentally sound manner. Conformance to these requirements shall be determined by the Contractor, subject to disapproval of the Engineer, whose failure to disapprove does not, however, constitute any shift of responsibility to properly handle equipment and materials from Contractor to Engineer. Tank Truck haul routes and site access shall be as directed by OWNER 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 seven days prior to the delivery date.

C. CONTRACTOR will be responsible for addressing any chemical spill or release in accordance with its spill prevention and contingency plan, and all laws and proper practices. CONTRACTOR will inform the Engineer of any such spill or release as soon as possible.

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

3.02 UNFAVORABLE TREATMENT CONDITIONS

A. The ENGINEER will be responsible to monitor wind, water column temperature, and precipitation in order to make judgments about weather condition suitability for application. ENGINEER can make onsite determinations to pause the application if wind speeds exceed 15 mph and could force water mixing that might interfere with the application. If the application is paused, ENGINEER will determine when the application can resume based on suitable wind conditions.

B. Application of aluminum shall not occur if it can be reasonably expected (forecast) that a significant precipitation event (greater than 1.5 inch in 24 hours) shall occur during treatment or begin within 24 hours after treatment completion.

C. Application of aluminum shall not occur if the surface water temperature is below 40⁰ F.

D. Application of aluminum should only occur if the wind speeds at the surface of the lake are below 20 mph.

3.04 LOCATION OF WORK

A. Project Limits shall be the area equal to or greater than 5 feet water depth in Casey Lake and access areas indicated on C101.

B. The staging area is located at the Archer’s Shelter Parking Area and Public boat launch.

3.05 ALUMINUM APPLICATION

A. The Contractor shall be responsible for the purchase, delivery, scheduling, and application of the chemicals including all labor.

B. The Contractor shall be responsible for all staging area setup, security, cleanup, and restoration to its original condition. The Contractor shall meet all local and county requirements and take reasonable steps to minimize impacts on residents and lake users in noise, parking, safety, equipment and supply storage, smells, and general condition of the site.

C. The Contractor shall conduct the aluminum application utilizing a barge or similar vessel with an Engineer approved injection system that allows for uniform application of liquid aluminum. Aluminum application shall be made to the indicated areas of Casey Lake as shown on C101.

D. The Contractor shall ensure that the aluminum sulfate and sodium aluminate are applied at a ratio of 2:1 (2 gallons of aluminum sulfate for every 1 gallon of sodium aluminate). This ratio must be maintained to ensure that the pH in the lake water is maintained between 6 and 9. The application of the aluminum sulfate and sodium aluminate liquids must occur simultaneously using one boat (or system).

E. The Engineer estimates that the respective treatment rates will require a total material outlined in Table 1. It is Contractor’s responsibility to ensure that enough material is available to complete the Work in accordance with the dosing requirements stated herein.

F. The Contractor shall ensure that the aluminum sulfate and sodium aluminate are evenly distributed throughout the treatment area and that the appropriate dose is applied to the appropriate zones shown in C101.

G. The Engineer will monitor the ambient pH in Casey Lake during the aluminum treatment application. If at any time during treatment, the depth-averaged ambient pH in the lake falls below 6.5 or increases above 9 S.U., Contractor will stop the treatment. Treatment will not resume until authorized by the Engineer.

H. The Contractor shall conduct jar tests immediately prior to the start of the alum treatment and every morning before daily treatment begins to evaluate the effects of using the chemicals in lake water at the time of the treatment. Results of the treatment jar test will be used, if necessary, to adjust the application rate. Results will be shared with the Engineer and approval to proceed or a modification jointly agreed upon.

I. The aluminum treatment shall be made at a sufficient rate to ensure long term sediment phosphorus inactivation, as determined by the Engineer. Unless advised otherwise by the Engineer, the Contractor shall apply aluminum sulfate at a dose rate, Table 2:

Table 2: Buffered Alum Application Rate Waterbody Aluminum

Sulfate (gal/acre)

Sodium Aluminate (gal/acre)

Casey Lake Application 723 361

J. The Contractor will maintain ongoing communication with the Engineer and BHCC and will advise the Engineer on an ongoing basis as to application status, water pH readings, and all other conditions relevant to alum application and dosing. The Contractor shall keep daily records acceptable to the Engineer and available for review as a basis for and substantiation of payment. Daily logs shall minimally state the following:

a. Hours of aluminum application

b. The quantity of aluminum applied

c. The approximate acreage and volume treated

d. Approximate location (on map) of area treated

e. Summary of truck deliveries

f. Explanation of any downtime

K. The Contractor shall comply with all of the conditions of the permits.

**END OF SECTION**

CASEY LAKE

X AVE

HICKORY

HILLS PARK

Y

AV

E

52ND ST

130TH ST

PARK BOUNDARY

(APPROXIMATE)

HICKORY HILLS

PARK ENTRANCE

HICKORY HILLS RD

SITE ACCESS ROUTE

A B C D E F

A B C D E F

W es to w n Pk w y, S ui te

W es t D es

M oi ne s, Io w a

5.

3.

w w w

.s hi ve -h at te ry .c om

Io w a

Il lin oi s

In di an a

N eb ra sk a

STATE OF IOWA

ENGINEER

SHIVE-HATTERY, INC

ATTN: LUKE MONAT

4125 WESTOWN PARKWAY, SUITE 100

WEST DES MOINES, IOWA 50266

PH: (515) 223-8104

FX: (515) 223-0622

OWNER:

BLACK HAWK COUNTY CONSERVATION

ATTN: CHERRIE NORTHRUP & AL FINKE

1346 WEST AIRLINE HIGHWAY

WATERLOO, IOWA 50703

PH: (319) 433-7275

CONTACT INFORMATION:

TAMA COUNTY

PROJECT

LOCATION

TAMA

TOLEDO

MONTOUR

GARWIN

DYSTART

TRAER

PR

O

JE

C

T N

O

C

LI

EN

T

N O

Pr in te d: C000

BI

DD

IN

G

/3

0/

C

AS

EY

L

AK

E

AL

U

M D

O

SI

N G

BL

AC

K

HA

W K

CO

UN

TY

C

O

NS

ER

VA

TI

O

N

HI

CK

O

RY

H

IL

LS

P

AR

K, T

AM

A

CO

UN

TY

P:

\P ro je ct s\

DM

\4

\D el ive ra bl es \D ra wi ng s\

1_ Ci vil \P ha se

Al um

D os in g\

C0

C O

VE

R

SH

EE

T.

dw g 6/

/2

2:

:5

PM

GLADBROOK

ENGINEERING BUREAU CHIEF DATE

AUTHORIZATION - PARKS | WILDLIFE | FISHERIES | LAW ENFORCEMENT | FORESTRY DATE

AUTHORIZATION TO BID

PAGES, SHEETS OR DIVISIONS COVERED BY THIS SEAL:

My License Renewal Date is: DECEMBER 31, Printed or typed name:

License Number:

Signature: Date

I HEREBY CERTIFY THAT THIS ENGINEERING DOCUMENT DESCRIBED

BELOW WAS PREPARED BY ME OR UNDER MY DIRECT PERSONAL

SUPERVISION AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF IOWA.

ALL SHEETS

LUKE MONAT

22610

CIVIL ENGINEER

DNR REPRESENTATIVE

IOWA DEPT. OF NATURAL RESOURCES

ATTN: MICHELLE BALMER

6200 PARK AVENUE

DES MOINES, IOWA 50321

PH: (515) 238-2458

DNR PROJECT #24-05-86-01

LIMNOLOGIST

STANTEC

ATTN: DENDY LOFTON

1 CARLSON PKWY N

PLYMOUTH, MN 55447

PH: (612) 712-2072

CASEY LAKE ALUM DOSING

BLACK HAWK COUNTY CONSERVATION

HICKORY HILLS PARK, TAMA COUNTY

Sheet List Table Sheet Number Sheet Title

C000 COVER SHEET

C101 SITE PLAN

6/30/2026

Exhibit 2: 27CRDLWBMBALM-0001

HICKORY HILLS RD

SITE ACCESS ROUTE

STAGING, CHEMICAL TANK STORAGE, AND

VESSEL LOADING AREA. COORDINATE

ACCESS/STAGING PLAN WITH BLACK

HAWK COUNTY CONSERVATION.

APPROXIMATE

PROPERTY LINE (TYP)

MAIN LAKE TREATMENT ZONE,

WATER DEPTH OF 5' OR GREATER.

AREA = 30.8 ACRES

SW FOREBAY TREATMENT ZONE

AREA = 1.0 ACRES

NW FOREBAY TREATMENT ZONE

AREA = 0.7 ACRES

NE FOREBAY TREATMENT ZONE

AREA = 0.5 ACRES

FOREBAY NWL = 896.50

FOREBAY NWL = 896.50

FOREBAY NWL = 896.50

MAIN LAKE NWL = 895.50

BOAT RAMP

ROUTE TO PARK ENTRANCE

BOAT LAUNCH

D R

AW

N

B Y

AP

PR

O

VE

D B

Y

IS

SU

ED

F

O R

IS

SU

E D

AT

E

C

LI

EN

T

PR

O

JE

C

T N

U M

BE

R

PR

O

JE

C

T N

U M

BE

R

Pr in te d: C101

SI

TE

P

LA

N M

M O

LT

M

BI

DD

IN

G

/3

0/

0 ---

---C

AS

EY

L

AK

E

AL

U

M D

O

SI

N G

BL

AC

K

HA

W K

CO

UN

TY

C

O

NS

ER

VA

TI

O

N

HI

CK

O

RY

H

IL

LS

P

AR

K, T

AM

A

CO

UN

TY

P:

\P ro je ct s\

DM

\4

\D el ive ra bl es \D ra wi ng s\

1_ Ci vil \P ha se

Al um

D os in g\

C1

S

TA

G

IN

G A

ND

A

CC

ES

S

PL

AN

.d wg 6/

/2

2:

:0

PM

W

ES

TO

W

N P

AR

KW

AY

, S

U

IT

E

W

ES

T

D

ES

M O

IN

ES

, I A

5.

3.

S H

IV

E-

H

AT

TE

R

Y.

C

O M

A B

A B C D E F

C D E F

NORTH

LEGEND

LINE TYPEDESCRIPTION

ACCESS ROUTE

BOAT RAMP

STAGING AREA

NORMAL WATER LEVEL

PROPERTY BOUNDARY

MAJOR CONTOUR

MINOR CONTOUR

TREATMENT ZONE

APPLICATION RATES

ALUMINUM SULFATE: 718 GAL/ACRE

SODIUM ALUMINATE: 359 GAL/ACRE

CASEY LAKE SUMMARY

MAXIMUM DEPTH: 19.2 FT

MEAN DEPTH: 9.9 FT

LAKE AREA: 38.3 ACRES

VOLUME: 380.2 ACRE-FT

TREATMENT AREA: 33 ACRES

*THESE VALUES INCLUDE THE 3

IN-LAKE FOREBAYS SHOWN

22.5