Funding Information:

Org. Code E.O.

Object Code

Budget Entity Appropriation

Category Grant # Project # Year Amount

Additional Funding Information attached on separate page.

Rev. 8/26/2020

STATE OF FLORIDA

DEPARTMENT OF ENVIRONMENTAL PROTECTION

Task Assignment This Task Assignment (TA) is entered into between the Parties named below, pursuant to Contract Number: .

1. TA Number: TA Completion Date:

TA Description:

2. Parties State of Florida Department of Environmental Protection

(Department)

Department Project Manager: Department Project Manager Phone:

Contractor Name: (Contractor ) ntractor’st ’s Project Manager: ontractor’s t’s Project Manager Phone:

3. Project Number:

(If different from TA Number)

Project Location(s):

Project Name:

4. As consideration for the services rendered by Contractor under the terms of this TA, the Department shall pay the Contractor on the following bases, up to the Total TA Value as indicated below:

Fixed Price:

Fixed Unit Rate: (Extended Price)

Cost Reimbursement:

Total TA Value:

5. The Parties agree to comply with the terms and conditions of the underlying the Contract, and the following attachments which are hereby incorporated by reference:

Attachment 1:

Additional Attachments (if necessary):

IN WITNESS WHEREOF, this TA shall be effective on the last date signed below.

State of Florida Department of Environmental Protection

CONTRACTOR Department

Name:

Title: Secretary or Designee

(Authorized Signature) (Authorized Signature)

Date:

Additional signatures attached on separate page.

HW683

DC005F May 30, 2025

This Task Assignment authorizes Geosyntec to conduct Groundwater Monitoring activities at Walker Plaza in accordance with Geosyntec's scope of work, cost estimate and schedule received on January 16, 2025.

Sarah Aduwa 850-245-8973 Geosyntec

James Mills 813-379-4389

ERIC 4783

603 – 617 North Maryland Avenue Plant City, Hillsborough County, Florida

Walker Plaza

$ 7,100.23

$ 7,100.23

Scope of Work

Geosyntec

Todd Kafka

Contract Manager

Todd Kafka, P.G. Digitally signed by Todd Kafka, P.G.

Date: 2025.01.21 10:45:31 -05'00'

Mubeen Darji

Mubeen Darji, P.E. Digitally signed by Mubeen Darji, P.E.

Date: 2025.01.21 09:25:54 -05'00'

N/A

Task Assignment Notification/Change Order Deliverables and Invoice Schedule Attachment

WC TAFORM

Contract Number:

Task Assignment #:

Deliverables:

Deliverable Deliverable Due Date

Invoice Schedule:

Requirements for Invoice Submittal Amount to be Invoiced

TOTAL COST

FLORIDA DEPARTMENT OF

Environmental Protection

Bob Martinez Center 2600 Blair Stone Road

Tallahassee, FL 32399-2400

Ron DeSantis Governor

Jeanette Nuñez Lt. Governor

Alexis A. Lambert Secretary

To: HW683 Contract Negotiation File Walker Plaza Plant City, Hillsborough County, Florida

ERIC_4783

From: Sarah Aduwa, Project Manager Date: January 17, 2025 Subject: Negotiation Summary

HW683_DC005F

This Task Assignment authorizes Geosyntec to conduct Groundwater Monitoring activities at Walker Plaza in accordance with Geosyntec scope of work, cost estimate and schedule received on January 16, 2025. The total cost is $7,100.23

James Mills is the project manager; his hours are directly computed.

Subtask 2, 3 – Groundwater Monitoring and Reporting This subtask includes costs associated with annual groundwater monitoring activities tentatively scheduled for March 2025. Groundwater levels will be collected from 19 monitoring wells at the site and adjacent off-site parcels. Measurements will be collected over a 24-hour period to generate groundwater elevation contour maps to evaluate groundwater flow directions. Groundwater samples will be collected from five monitoring wells on the off-site parcel (MW002, MW006, MW010, MW011, MW016) in general accordance with FDEP’s Standard Operating Procedures and will be submitted for laboratory analysis of VOHs by Environmental Protection Agency Method 8260B.

Geosyntec will prepare one interim field deliverable that includes groundwater sampling field forms, laboratory analytical results, updated Mann-Kendall statistical analyses, four updated tables summarizing field and laboratory data etc. Based on FDEP’s review of the interim field deliverable and recommendations, Geosyntec may submit a change order to prepare a final report for this event or a Site Rehabilitation Completion Report.

The FDEP Project Manager agrees to the scope of work and final cost associated with this Task assigner. The final cost is $7,100.23 with 40 labor hours.

LEVEL OF EFFORT/EXPENSE WORKSHEET

SITE : Walker Plaza SUBTASK: Groundwater Sampling

DATE: 1/16/2025

LABOR CATEGORY *PROVIDE TIME REQUIRED FOR EACH PERSON

STAFF-TITLE WORK DESCRIPTION HOURS

Principal

T. Kafka 1

Project Professional

J. Mills 11

Professional

C. Saville 1

Senior Staff Professional S. Ohrmundt

TOTAL LABOR 35

VEHICLE TYPE RATE UNIT USEAGE

Truck $120.00 Day 2 $240.00

Subtotal $240.00

TOTAL VEHICLE $240.00

LABORATORY COSTS

PARAMETER RATE # SAMPLES #QAQC

VOCs (8260B) 5 wells; 1 IDW $73.00 6 $438.00

Subtotal $438.00

Shipping

Small Cooler (0 to 25 lbs) $110.00 1 $110.00

Subtotal $110.00

TOTAL LAB $548.00

EQUIPMENT ITEM RATE COSTING UNIT USEAGE TOTALS

Analytical Related

Groundwater Sampling Kit $290.00 Day 2 $580.00

Subtotal $580.00

IDW Related

Drum $100.00 Each 1 $100.00

Subtotal $100.00

Expendables

$40.00 Day 2 $80.00

Subtotal $80.00

TOTAL EQUIPMENT $760.00

Data evaluation/interpretation

RPO coordination and logistics to access interior wells (2 hr). Evaluate and interpret field data (1 hr). Prepare field package including tables, figure, Mann-Kendall analyses, and conclusions/recommendation (8 hr).

Update 1 report figure

Field preparation (1 hr). Round trip mobilization/demobilization (2 d @ 3 hr/d = 6 hr). Collect 15 water levels from MWs not sampled on first day (3 hr). Sample 5 monitoring wells (5 @

1.5 hr/well = 8 hr). Equipment calibration (2 d @ 0.5 hr/d = 1 hr). IDW management (1 hr).

Sample management (2 hr).

LEVEL OF EFFORT/EXPENSE WORKSHEET

SITE : Walker Plaza SUBTASK: IDW Management

DATE: 1/16/2025

LABOR CATEGORY *PROVIDE TIME REQUIRED FOR EACH PERSON

STAFF-TITLE WORK DESCRIPTION HOURS

Project Professional

J. Mills 1

TOTAL LABOR 1

SUBCONTRACTOR COSTS

NAME PURPOSE COST

IDW

Erwin Remediation IDW T&D $195 $195.00

Subtotal $195.00

TOTAL SUB $195.00

Review and signature of waste profile and manifest, including pickup coordination

12802 Tampa Oaks Blvd, Suite 151 Tampa, Florida 33637

PH 813.558.0990

FAX 813.558.9726

www.geosyntec.com

16 January 2025

Ms. Sarah Aduwa Florida Department of Environmental Protection Waste Cleanup Program 2600 Blair Stone Road Tallahassee, FL 32399-2400

Subject: Scope of Work and Cost Estimate Form/Level of Effort Groundwater Monitoring - 2025

Walker Plaza 603 – 617 North Maryland Avenue Plant City, Hillsborough County, Florida

FDEP Facility ID ERIC_4783

Dear Ms. Aduwa:

Geosyntec Consultants, Inc. (Geosyntec) has prepared this Scope of Work (SOW) and Cost Estimate Form/Level of Effort (Attachment A) for semi-annual monitoring of volatile organic halocarbons (VOHs) at the Walker Plaza site (herein, the “Site”; Facility ID ERIC_4783) located in Plant City, Florida. Monitoring of VOHs proposed in this SOW is consistent with recommendations provided in the Groundwater Monitoring Report (Report) dated July 2024 and approved by the Florida Department of Environmental Protection (FDEP) on 12 August 2024 and additional discussion with FDEP on 23 September 2024. The closure strategy for this Site includes demonstrating stable and shrinking conditions within the groundwater plume and using a non-recorded institutional control for groundwater through the Southwest Florida Water Management District pursuant to conditional closure via Risk Management Option III.

Geosyntec confirmed that Site Access Agreements were executed by Ms. Karen Davis on 27 April 2022 as the property owner of Walker Plaza (ERIC_4783) located at the above address and by David Ligon on 30 October 2018 as the property owner of the parcel adjacent to Walker Plaza located at 1502 East Baker Street, Plant City, FL.

Subtask 1 – Project Management

James Mills, P.E. will serve as Project Manager for the proposed SOW. Costs associated with this subtask are directly computed.

Subtask 2 – Groundwater Sampling

This subtask includes costs associated with groundwater monitoring activities tentatively scheduled for March 2025. The former dry cleaning activities in the Walker Plaza center occurred in suites now occupied by a laundromat and grocery store (Felton’s Market), each of which requires more than typical coordination and planning, especially inside Felton’s Market since wells are located in aisles and other busy areas. As recommended in the 2024 Report, Geosyntec will collect depth-to-groundwater measurements from 19 accessible monitoring wells at the Site and adjacent off-Site parcel and groundwater samples from five monitoring wells on the off-Site parcel (MW002, MW006, MW010, MW011, and MW016; see Figure 1).

Groundwater samples will be collected in general accordance with FDEP’s Standard Operating Procedures and will be submitted for laboratory analysis of VOHs by Environmental Protection Agency Method 8260B. Geosyntec will containerize the purge water in a 55-gallon steel drum and one investigative derived waste (IDW) characterization sample will be collected from the drum for analysis of VOHs. Geosyntec has assumed that this subtask can be completed by one field staff in two field days including round trip travel.

Geosyntec will prepare one interim field deliverable that includes groundwater sampling field forms, laboratory analytical results, updated Mann-Kendall statistical analyses, four updated tables summarizing field and laboratory data (DTW measurements, geochemical field parameters, groundwater analytical results for VOHs, and Mann-Kendall trend summary), one updated figure summarizing the surficial aquifer VOH analytical results, and an abbreviated conclusions and recommendations section based on limited data evaluation. Based on FDEP’s review of the interim field deliverable and recommendations, Geosyntec may submit a change order to prepare a final report for this event or a Site Rehabilitation Completion Report.

Subtask 3 – IDW Management

This subtask includes costs associated with the transportation and disposal of IDW generated during groundwater sampling activities. Geosyntec will containerize purge water in one 55-gallon steel drum, which will be labelled, covered with plastic, and wrapped in orange construction fencing. The drum will be transported off-Site and disposed of under the existing non-hazardous waste profile by Erwin Remediation, Inc. Based on per- and polyfluoroalkyl substances (PFAS) screening completed as part of Task Assignment HW013A, it is assumed that the drum will need to be disposed of as PFAS-impacted waste. Quotes for the transportation and disposal of IDW are included as Attachment B. Erwin Remediation, Inc.

remains the lowest cost provider. It is assumed that oversight of the IDW pickup will not be required. Geosyntec will submit the final waste manifest to FDEP via email upon receipt from the waste hauler.

Invoice and Deliverable Schedule:

Note that this schedule reflects three weeks for FDEP review of the SOW by 7 February 2025.

Geosyntec requests the following schedule of deliverables and invoices:

Subtask Deliverable Deliverable Date Invoice Amount

Submittal of groundwater sampling interim field deliverable 11 April 2025 $ 6,107.25

1, 3 Submittal of final IDW manifest via email 4 April 2025 $ 992.98

TOTAL $ 7,100.23

As always, it is a pleasure to work with the FDEP. Please contact James Mills at 813.379.4389 if you have any questions or require additional information.

Sincerely, James C. Mills, P.E.

Project Engineer

Todd K. Kafka, P.G.

Senior Principal Hydrogeologist

Attachments

FIGURE 1

ATTACHMENT B

IDW QUOTES

408 Ditmar Street

Pensacola, FL 32503

ErwinRemediation@Gmail.com - P.O. Box 884 Gulf Breeze, FL 32562

(850) 292-6511

To: Ms. Maria Lemes Geosyntec Consultants, Inc.

19321 US Highway 19 North Clearwater, FL 33764

December 16, 2024

Re: Non-Hazardous Drum Disposal of PFOS/PFAS Impacted Materials

Ms. Lemes:

The price for the transportation and disposal (T&D) of 55-gallon drums of non-hazardous soil, mud, and water is listed below:

Impacted with Non-Hazardous Petroleum or Chlorinated Solvents:

Description Rate Unit

T&D - Non-Haz Soil $ 110.00 Per Drum

T&D - Non-Haz Mud/Water $ 125.00 Per Drum

Impacted with Non-Hazardous PFAS/PFOS:

Description Rate Unit

Profile Fee (Charged once per site) $ 350.00 Per Site

T&D - Non-Haz PFOS/PFAS Impacted Soil $ 195.00 Per Drum

T&D - Non-Haz PFOS/PFAS Impacted Mud/Water $ 195.00 Per Drum

Dry cleaning sites will require 8260-VOH lab analysis and PFAS sites will require the full FDEP lab analysis for IDW waste characterization.

This quote is valid for 120 days.

Respectfully, Jonathan Erwin Erwin Remediation, Inc.

Email: ErwinRemediation@Gmail.com Office: (850) 292-6511

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