HomeMy WebLinkAboutResolution 2026-076Resolution No. 2026-76
A RESOLUTION OF THE UNITED CITY OF YORKVILLE, KENDALL COUNTY,
ILLINOIS APPROVING A CONTRACT WITH TERRACON CONSULTANTS, INC.,
FOR BROWNFIELD REMEDIATION WORK IN DOWNTOWN YORKVILLE
WHEREAS, the United City of Yorkville (the "City") is a duly organized and validly
existing non home -rule municipality created in accordance with the Constitution of the State of
Illinois of 1970 and the laws of the State; and
WHEREAS, the City's Code of Ordinances provides that the City may approve contracts
in excess of $25,000 that have not been competitively bid by a two-thirds affirmative vote of the
City Council; and
WHEREAS, a parking lot owned by the City, a parcel owned by Build For Tomorrow
LLC, and a former service station and farm supply depot owned by the City, all located at East
Van Emmon Street and Bridge Street (the "Subject Property"), have been designated brownfield
properties by the Illinois Environmental Protection Agency ("IEPA"), requiring certain
remediation action at the Subject Property; and
WHEREAS, the City plans to utilize the Subject Property as a mixed -use recreation and
event space in the future, and therefore desires to complete remediation on the Subject Property
and obtain a no-further-remediation (NFR) letter from IEPA; and
WHEREAS, Terracon Consultants, Inc. ("Terracon") had conducted soil sampling on the
Subject Property in 2025; and
WHEREAS, Terracon is recommending further soil sampling to accurately assess the
boundaries of the brownfield, and locate areas on the Subject Property that will need to be
excavated; and
Resolution No. 2026-76
Page 1
WHEREAS, Terracon has provided a Proposal for Environmental Services (the "Quote")
to the City to conduct further work toward receiving a remediation plan from IEPA for the Subject
Property, in an amount not to exceed $86,220.00 for the study and planned work; and
WHEREAS, creation of an IEPA approved Brownfield remediation plan is a necessary
step in the remediation process required to receive a no-further-remediation letter from IEPA, and
City staff therefore recommend approval of the Quote; and
WHEREAS, the Mayor and City Council have determined that it is in the best interests of
the health and safety of the City and its residents to waive the competitive bidding requirement
and to authorize and approve the proposal by Terracon, in a total amount not to exceed $86,220,
in accordance with the provisions of the Quote.
NOW, THEREFORE, BE IT RESOLVED by the Mayor and City Council of the United
City of Yorkville, Kendall County, Illinois:
Section 1. The foregoing recitals are hereby incorporated in this Resolution as the
findings of the Corporate Authorities.
Section 2. The Corporate Authorities hereby waive the competitive bidding
requirement pursuant to the City's Code of Ordinances, and approve the Proposal for
Environmental Services by Terracon Consultants, Inc. in an amount not to exceed $86,220.
Section 3. That this resolution shall be in full force and effect from and after its
passage and approval according to law.
Passed by the City Council of the United City of Yorkville, Kendall County, Illinois this
8tn day of September, A.D. 2026.
CITY CLERK
U. -erg
Resolution No. 2026-76
Page 2
KEN KOCH
AYE
DAN TRANSIER
AYE
ARDEN JOE PLOCHER
AYE
CRAIG SOLING
AYE
CHRIS FUNKHOUSER
AYE
MATT MAREK
AYE
RUSTY CORNEILS
AYE
RUSTY HYETT
AYE
r
APPROVED by me, as Mayor of the United City of Yorkville, Kendall County, Illinois
this (0b day of 4WQA�-r , A.D. 2026.
Attest:
CITY CLERK ty c�er�
Resolution No. 2026-76
Page 3
Terracon
June 16, 2026
United City of Yorkville
661 Prairie Pointe Drive
Yorkville, Illinois 60560
Attn: Mr. Bart Olson
P: (630) 553-8537
E: bolsonAyorkyille._il.u_s
192 Exchange Blvd,
Glendale Heights, IL 60139
P (630) 717-4263
F (630) 357-9489
Terracon.com
Re: Proposal for Environmental Services
Site Remediation Program Activities — Supplemental Sampling and Evaluation
Former Grainco FS and City Parking Lot
IL Route 47 and East Van Emmon Street
Yorkville, Kendall County, Illinois
Terracon Proposal No.: 1000008694
Dear Mr. Olson:
Terracon Consultants, Inc. (Terracon) is pleased to submit this proposal to the United City of Yorkville
(City, Client) to provide supplemental environmental services at the above -referenced site (the site) to
facilitate obtaining a Comprehensive No Further Remediation (NFR) letter from the Illinois
Environmental Protection Agency (IEPA) Site Remediation Program (SRP). The following sections
provide background on the site and Terracon's scope of services, compensation, and schedule. If we
have misunderstood an aspect of the work, please let us know as soon as possible so we can evaluate
our scope and make necessary adjustments.
1.0 BACKGROUND
The site is located west of Illinois Route 47 between East Hydraulic Avenue and East Van Emmon
Street in Yorkville, Kendall County, Illinois. The site that is proposed for redevelopment is comprised
of a parking lot owned by the City and a former service station and farm supply depot formerly owned
by Grainco FS and now owned by the City. Historical usage of the Grainco FS portion of the site
included a lumberyard, feed mill, equipment repair services, fertilizer supply, animal feed supply, and
distribution of kerosene, oil, gasoline, and diesel fuel to local farmers through approximately 2004. The
City parking lot was undeveloped land through approximately 2000, when it was first developed as a
paved parking area.
The site was originally enrolled in the SRP in November 2005. Civil & Environmental Consultants, Inc.
(CEC) conducted various prior stud ieslinvestigations at the site, as documented in a Phase 1
Proposal for Environmental Services
erraeon
Former Grainco FS and City Parking lot m Yorkville, Illinois
June 16, 2026 rs Terracon Proposal 1000008694
Environmental Site Assessment (June 2005), an Initial Phase 11 Site Investigation report (October
2005), and a Comprehensive Site Investigation Report (CSIR) that CEC submitted to the IEPA in
October 2007. At the time of the CEC investigations, a parcel occupied by the Kendall County Farm
Bureau, located between the southern portion of the City Parking Lot and the former Grainco FS
property, was also included as part of the site under the SRP. The IEPA approved the CSIR in a letter
dated February 27, 2008. No additional activities or reporting occurred until October 2012, when
Terracon reached out to IEPA to re -open the project and submitted a Site Investigation Update Work
Plan, which was approved by IEPA in a letter dated December 19, 2012. In April 2013, Terracon
completed the scope proposed in the Site Investigation Update Work Plan, including a test pit
excavation to investigate a suspect fill pipe for the potential presence of a UST, advancing five soil
borings to update site soil conditions, and sampling of groundwater from the existing monitoring wells.
Based on a review of the IEPA's Document Explorer, the results from the 2013 site investigation
activities were never submitted to the IEPA, and no further correspondence occurred besides notices
to terminate SRP and intent to remain in the SRP letters.
In 2025, the City retained Terracon to move the site forward towards the goal of achieving a
Comprehensive NFR letter through the SRP. The City intends to re -develop the site as a mixed -use
recreational/commercial area with a bandshell, plaza space, event lawn, seating area, and associated
parking lots. Terracon prepared and submitted to IEPA a Comprehensive Site Investigation Work Plan
(CSIWP), which was conditionally approved by the IEPA on April 22, 2025, IEPA's approval letter
stated that data generated for the site in prior years could be used as a guide for the investigation but
could not be used as complementary to the current investigation. Terracon subsequently provided a
proposal to the City to conduct investigation activities at the site and prepare a combined
Comprehensive Site Investigation Report (CSIR), Remediation Objectives Report (ROR), and
Remedial Action Plan (RAP), which was authorized by the City on August 19, 2025 (Terracon's SRP
proposal).
Terracon began investigation activities in September 2025. By that time, the owners of the Kendall
County Farm Bureau parcel had withdrawn the parcel from being included as part of the SRP site;
therefore, sampling was not conducted on that parcel. The investigation identified impacts to soil,
groundwater, and soil gas. Based on the identified impacts relative to the proposed site redevelopment
plan and IEPA's expected remediation requirements, Terracon proposes supplementary sampling and
modeling activities to further evaluate the exceedances discussed below. A full delineation of impacts
is necessary prior to developing the remediation objectives (ROs) for the ROR and to evaluate the
most efficient/effective remediation strategies for the RAP.
Arsenic, lead, and/or manganese were identified in soil samples at various locations across the
site, at concentrations exceeding their respective Tier 1 ROs for the residential soil ingestion
exposure route. Engineered barriers are typically used to mitigate this exposure route over a
large area. Engineered barriers can include asphalt- or concrete -paved surfaces. For future
landscaped areas, the landscape barriers for the soil ingestion exposure route typically include
the removal and proper disposal of the upper 3-foot thick layer of soil from greenspace areas
and replacement with a 3-foot thick layer of certified clean soil. The 3-foot deep clean soil
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Proposal for Environmental services
Former Grainco FS and City Parking Lot w Yorkville, Illinois
June 16, 2026 w Terracon Proposal 1000008694
w ierracon
engineered barriers will be approximately 5 feet in diameter around trees and 3 in diameter
around bushes and shrubs. As an alternative for lawn areas, and with additional IEPA approval,
the upper 18 inches of soil from these areas could be removed and properly disposed, and
replaced with a 60-mil geotechnical membrane and 18 inches of clean soil.
2. Soil samples from boring B-103, located in the vicinity of the former USTslfilling station at the
site (and approximately 20 feet east of boring B-108), contained benzene and chloroform
concentrations exceeding their respective Tier 1 ROs for the residential outdoor inhalation
exposure route. Remediation options for this exposure route generally include excavation and
removal of the soils or the construction of an engineered barrier. In greenspaces, IEPA requires
the engineered barrier for this exposure route to consist of a 10-foot-thick layer of clean soil
overlying the contaminated soils. Based on the presence of bedrock at depths within 10 feet of
surface at the site, soils in the future greenspaces in this area will generally need to be removed
to bedrock. With the current data, it is unclear whether/how far soils with these exceedances
extend into the proposed greenspaces to the north and east. Additional sampling is proposed
to evaluate the extent of soil in these areas in an attempt to limit the volume of soil that will need
to be removed/la ndfilied and replaced with certified clean soil in these areas.
3. Soil samples from boring B-108, located in the vicinity of the former underground storage tanks
(USTs)Ifilling station at the site, contained total petroleum hydrocarbon (TPH) impacts
exceeding the site -specific soil attenuation capacity. The IEPA generally requires
excavation/removal of soils exceeding the site -specific soil attenuation capacity.
Supplementary sampling is proposed to assist with delineating the area of soil that must be
removed from the site and landfilled, as well as characterizing the soil for disposal acceptance
purposes. Boring B-108 is located approximately 18 feet to the west of B-103, so that the
sampling around borings B-108 and B-103 can be combined to some extent.
4. The concentrations of volatile organic compounds (i.e., benzene, ethylbenzene, chloroform,
and/or naphthalene) and lead in soil samples across areas of the site exceeded the Tier 1,
Class I ROs for the soil component of the groundwater ingestion exposure route. Preliminary
Tier 2 modeling indicates that the impacts may be expected to migrate off site to the north,
reaching the Fox River. We anticipate that IEPA will require additional modeling of the potential
impacts to the Fox River to verify if impacts discharge into the surface water body above the
surface water quality criteria.
5. The analytical results identified various metals in groundwater samples from MW-1 (lead,
aluminum, iron, and manganese), MW-9 (aluminum), MW-10 (iron and manganese), and
MW-11 (lead, iron, manganese, and several other metals including arsenic) at concentrations
exceeding the Tier 1, Class I groundwater ROs. Because MW-11 was a temporary monitoring
well that has been abandoned, a new, permanent 2-inch diameter monitoring well, MW-12, is
proposed for the area of the prior temporary monitoring well MW-11; groundwater from MW-12
will be sampled to evaluate metals to be addressed as contaminants of concern for the site.
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Proposal for Environmental Services
Former Grainco FS and City Parking Lot w Yorkville, Illinois
June 16, 2026 Lo Terracon Proposal 1000008694
Terracon
Groundwater from MW-1 and MW-10 will also be sampled to further evaluate the concentrations
of contaminants previously identified in groundwater samples from these wells.
6. A new permanent monitoring well, MW-13, is proposed along the northwest boundary of the
site, approximately midway between existing monitoring wells MW-8 and MW-9. A groundwater
sample from this well will provide additional data on the downgradient site boundary.
7. Tier 1 soil gas ROs were exceeded in two of the three soil gas samples collected at the site.
The exceedances were in soil gas samples collected from two soil gas points located near the
boundary between the former fueling area on the Grainco FS parcel and the west adjacent
Kendall County Farm Bureau parcel. When Tier 1 soil gas exceedances are present along a
property boundary, IEPA typically requires soil gas impacts to off -site properties to be
evaluated. As a result, two soil gas sampling points are proposed on the Kendall County Farm
Bureau parcel; it will be necessary to obtain an access agreement from the owners of the
Kendall County Farm Bureau parcel to allow soil gas sampling on that property.
An outline of the proposed scope of services, budget, and schedule are provided below.
2.0 SCOPE OF SERVICES
Utility Clearance
No later than 48 hours prior to intrusive activities, Terracon's drilling subcontractor will contact the local
one -call public utility locating service (i.e., JULIE) to arrange for public underground utility locates at
the site. Please note that the public utility locator only locates public utilities. Terracon is not responsible
for damages related to improperly marked utilities or to private utilities for which information is not
provided. Client is responsible for providing location information on any known private utilities on site.
Terracon will mark the proposed boring locations at the site and conduct a private utility locate to clear
the proposed locations.
Health & Safety Plan
Terracon is committed to the safety of all its employees. As such, and in accordance with our Incident
and Injury Free` safety goals, Terracon will utilize/update the existing site safety plan for our personnel
during field services. Prior to commencement of on -site activities, Terracon will hold a brief health and
safety meeting to review health and safety needs for this specific project. At this time, we anticipate
performing fieldwork in a United States Environmental Protection Agency (USEPA) Level D work
uniform consisting of hard hats, safety glasses, protective gloves, and steel -toed boots. It may become
necessary to upgrade this level of protection, at additional cost, during sampling activities in the event
that we encounter petroleum or chemical constituents in soils or groundwater that present an increased
risk for personal exposure.
Site Access and Special Safety Considerations
Client shall secure all necessary site related approvals, permits, licenses, and consents necessary to
commence and complete the Services and will execute any necessary site access
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Proposal for Environmental Services
Former Grainco FS and City Parking Lotj Yorkville, Illinois erracon
June 16, 2026 v Terracon Proposal 1000008694
agreement. Consultant will be responsible for supervision and site safety measures for its own
employees but shall not be responsible for the supervision or health and safety precautions for any
third parties, including Client's contractors, subcontractors, or other parties present at the site. In
addition, Consultant retains the right to stop work without penalty at any time Consultant believes it is
in the best interests of Consultant's employees or subcontractors to do so. Client agrees it will respond
quickly to all requests for information made by Consultant related to Consultant's pre -task planning
and risk assessment processes.
Supplemental Sampling and Site Evaluation
Following conversations with the Client, two scope of work options were developed in an effort to
advance the goal of obtaining a NFR considering the proposed site redevelopment.
• Option 1 — Address the areas of concern with fewer, focused samples in the future greenspace
areas. In general, with this option, the assumption would need to be made in the Remedial
Action Plan that the future greenspace areas would either need to be excavated down to 3 feet
below ground surface and replaced with certified clean fill, or an alternative barrier, such as the
removal and proper disposal of the upper 18 inches of soil from all greenspace areas and
replacement with a 60-mil geotechnical membrane and 18 inches of clean soil would be used,
if proposed to and approved by the IEPA. Please note that some limited sampling in future
greenspace areas is included in this option and could provide an indication as to whether further
sampling in these areas may be beneficial in determining whether some areas meet the
residential ingestion remediation objectives and therefore would not require landscaped
engineered barriers.
• Option 2 - Provides for an additional 12 borings to provide a more thorough evaluation of the
future greenspace areas in an effort to potentially reduce the need for landscaped engineered
barriers. In addition, this option includes sampling farther out from the B-103 and B-108 areas
in the event samples from the borings in close proximity to these areas are found to exceed the
ROslcriteria and require excavation down to bedrock. This scope includes advancing 12 more
borings than Option 1.
Soil Sampling
Option 1 includes advancing seventeen (17) borings at the site in the approximate locations shown on
the attached Figures 1A and 1 B. Option 2 includes advancing twenty-nine (29) borings at the
approximate locations shown on the attached Figures 2A and 2B. In general, the borings will be
advanced to approximately 10 feet below ground surface or boring refusal, whichever is encountered
first, utilizing a direct -push Geoprobe® rig. The boring depths may vary based on obstructions and field -
interpreted depth of groundwater. Two of the borings will be extended to greater depth and into the
underlying bedrock using a drill rig with a hollow stem auger, in order to allow groundwater monitoring
wells to be installed, as discussed further below. Soil samples will be collected continuously from all
borings and will be field -screened with a PID. Soil vapors in each soil boring will be measured using a
lower explosive limit (LEL) meter upon drilling.
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Proposal for Environmental Services �erraeon
Former Grainco F5 and City Parking Lot -a Yorkville, Illinois
June 16, 2026 u Terracon Proposal 1000008694
Two discrete soil samples will be collected from each boring and preserved in the field for laboratory
analysis. In addition, one composite sample will be collected for waste characterization to support a
waste disposal profile and to provide additional parameters required by the investigation. The soil
samples collected for laboratory analysis will be placed into laboratory -supplied glassware on ice in a
cooler for analysis. The samples will be transferred to Terracon's subcontract laboratory under chain -
of -custody procedures. Analytical laboratory procedures will be performed by a National Environmental
Laboratory Accreditation Program (NELAP)-accredited laboratory. The attached Table 1 (for Option 1)
and Table 2 (for Option 2) summarize the sample depths and analytical parameters for the soil samples
from each boring. In addition, if total metals concentrations are significantly elevated, the proposal fees
include up to 12 samples analyzed for Toxicity Characteristic Leaching Procedure (TCLP) or Synthetic
Characteristic Leaching Procedure (SPLP) on standard analytical turnaround are included.
Sampling equipment will be cleaned before beginning the investigation and between each sampling
point using a non -phosphate soap wash followed by a potable water rinse. Following completion of the
sampling, the soil borings will be backfilled with cuttings (reverse order of the collection) and bentonite
(as needed). The ground surface at each boring location will be finished with similar materials (i.e. soil,
concrete, asphalt) to match the surrounding ground surface.
Groundwater Investigation
Two borings will be completed as permanent, 2-inch diameter groundwater monitoring wells,
designated MW-12 and MW-13, respectively, in the approximate locations depicted on the attached
Figures 1A, 113, 2A, and 2B. The wells are anticipated to be up to 20 feet deep, drilled into bedrock,
with 15-foot screens. After installation of monitoring wells MW-12 and MW-13, Terracon will develop
the wells by purging a minimum of up to ten well volumes from MW-12 and MW-13 (or purging until
dry).
Terracon will collect groundwater samples from monitoring wells MW-1, MW-9, MW-10, MW-12, and
MW-13 using low -flow groundwater sampling techniques. Samples will be placed into laboratory -
supplied glassware, placed on ice in a cooler, and submitted for analysis by USEPA methods. The
proposed analytical parameters are indicated on Tables 1 and 2 (for Options 1 and 2, respectively). An
unfiltered groundwater sample will be collected for analysis of metals from each of the monitoring wells.
The soil cuttings from the installation of the 2-inch diameter monitoring wells and purge water from the
monitoring wells will be containerized in 55-gallon drums. The disposal cost for a total of six 55-gallon
drums of soil and/or groundwater, assuming non -hazardous waste characterization, are included in
this proposal.
The relative elevation of the new monitoring wells will be measured in the field, using standard
surveying equipment to the nearest 11100th of a foot and depths to groundwater will be measured in
each well in order to evaluate the groundwater flow direction. Slow groundwater recovery may
necessitate more than one mobilization to the site to collect groundwater samples; an additional return
trip to the site has been budgeted for groundwater purging, sampling, and surveying. In the event that
groundwater recovery is not possible from a practical standpoint, options will be discussed with the
Client.
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Proposal for Environmental Services Terracon
Former Grainco F5 and City Parking Lot u Yorkville, Illinois
June 16, 2026 m Terracon Proposal 1000008694
Soil Gas Sampling
Two soil gas points (SG-4 and SG-5) will be installed under Terracon supervision using a Geoprobel
direct -push drill rig. As shown on the attached Figures 1A, 1 B, 2A, and 213, the locations of SG-4 and
SG-5 are on the Kendall County Farm Bureau property that is not within the remediation site boundary
and is not owned by the Client. Terracon will prepare and execute an access agreement with the
Kendall County Farm Bureau, with assistance from the City where applicable, to obtain access from
the Farm Bureau property owner to allow the installation of the two soil gas points.
The soil gas point construction and sampling methodology described in Terracon's SRP Activities
proposal, authorized by the City on August 19, 2025, will be followed. The soil gas samples will be
analyzed for VOCs using USEPA Method TO-15 at a NELAP-certified laboratory.
Laboratory Analytical Program
The samples collected during the comprehensive site investigation will be submitted to the analytical
laboratory under standard chain -of -custody procedures for standard turnaround time (TAT) of
approximately 5 to 7 business days. The analytical parameters and methods are listed in the attached
tables: Table 1 for Option 1 and Table 2 for Option 2.
Site -Specific Evaluation
Upon receipt of the analytical data, Terracon will compare the overall analytical data for the site to the
applicable Tier 1 ROs, further develop Tier 2 site -specific ROs for the site, conduct further modeling of
potential migration of contaminants in groundwater (and potentially into surface water if warranted),
and develop/refine proposed remediation strategies. Terracon may reach out to IEPA to discuss
aspects of the site, such as the need for surface water modeling. Terracon will discuss the proposed
remedial actions with the City. If certain parameters continue to exceed site -specific ROs, Terracon
may discuss whether it will be more practical to request a Focused NFR letter instead of a
Comprehensive NFR letter from the IEPA. In the event that further limited site characterization is
requested by the City to assist with remediation planning, Terracon will submit a supplemental proposal
to complete the needed work.
The findings and the agreed -upon remedial action plan will be documented/updated in the draft
combined CSIR, Remediation Objectives Report (ROR), and Remedial Action Plan (RAP) for the site,
currently in preparation based on the earlier findings. Subsequent to the City's review and concurrence
of the draft report, the combined report will be submitted to the IEPA along with a DRM-2 form (Request
to Review Technical Reports Form), as outlined in Terracon's SRP proposal. Based on the results from
the CSIRIRORIRAP and future site development plan, potential site cleanup activities and the
Remedial Action Completion Report (RACR) effort will be established and included in a future proposal.
Please note that a RACR must be completed and submitted to the IEPA demonstrating completion of
the RAP before the NFR letter will be issued. Completion of the RACR is not included in this proposal.
3.0 COMPENSATION
Terracon proposes to complete the required scope of work as described herein on a lump sum basis
and includes Terracon professional labor costs, travel and direct client expenses required to complete
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Proposal for Environmental Services ierracon
Former Grainco FS and City Parking Lot iFi Yorkville, Illinois
June 16, 2026 ra Terracon Proposal 1000008694
this scope of work using the project assumptions described herein. A summary breakdown of proposed
project costs for each option is provided below (please indicate the selected option below):
Compensation — Option 1
Fee
Supplemental Soil Investigation (17 soil borings), Monitoring Well and Soil Gas Point
installation - includes five days of field labor and subcontracted driller, private utility locate,
$46,830
analytical laboratory fees, field equipment, travel, and expenses, preparation/execution of
access agreement and coordination with Kendall County Farm Bureau property owners to
install soil gas points, disposal of four drums of non -hazardous soils.
Groundwater monitoring well development, surveying, and sampling, soil gas sampling —
$13 900
includes field labor, travel, expenses, analytical fees; disposal of two drums of non-
hazardous purge water
Reporting - update tables, exhibits, calculate Tier 2 remediation objectives with new data,
conduct further modeling with new data; up to three telephone calls with City and/or IEPA;
$10,200
complete draft combined report (CSIR/RORIRAP), incorporate client changes, finalization
and submittal of report and DRM forms to IEPA
TOTAL LUMP SUM FEE
Please initial to select this option
$70,930
(IEPA SRP review -related fees are not included)
Compensation — Option 2
Fee
Supplemental Soil Investigation (29 soil borings), Monitoring Well and Soil Gas Point
Installation - includes six days of field labor and subcontracted driller, private utility locate,
$59 070
analytical laboratory fees, field equipment, travel, and expenses, pre paratio nlexecution of
access agreement and coordination with Kendall County Farm Bureau property owners to
install soil gas points, disposal of four drums of non -hazardous soils.
Groundwater monitoring well development, surveying, and sampling, soil gas sampling -
$13,900
includes field labor, travel, expenses, analytical fees; disposal of two drums of non-
hazardous purge water
Reporting - update tables, exhibits, calculate Tier 2 remediation objectives with new data,
conduct further modeling with new data; up to three telephone calls with City and/or IEPA;
$13,250
draft combined report (CSIRIRORIRAP), incorporate client changes, finalization and
submittal of report and DRM forms to IEPA
TOTAL LUMP SUM FEE
$86,220
Please initial to select this option
(IEPA SRP review -related fees are not include
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Proposal for Environmental Services ierraeon
Former Grainco FS and City Parking Lot o Yorkville, Illinois ^
June 16, 2026 -1 Terracon Proposal 1000008694
As previously noted in Terracon's SRP proposal, the IEPA's SRP program is a pay for review program.
Quarterly invoices will be submitted by the IEPA to the Remediation Applicant (Client) for the review
services provided by the IEPA. Based on our previous experience, we suggest that you budget $7,500
— $16,000 for IEPA review and oversight costs, which will be direct billed from the IEPA to you. The
IEPA also assesses a $2,500 fee when the NFR letter is issued.
We anticipate that more than one Terracon invoice may be submitted as various tasks are completed;
however, not more frequently than on a once -a -month basis. If additional work is required outside the
scope of this proposal, you will be contacted and upon request, proposed costs for additional work will
be provided. Client authorization will be obtained prior to commencement of additional work outside
the scope of this proposal.
If this proposal meets with your approval, work may be initiated by returning a fully executed copy of
the attached Change Order No. 2. This fee is valid for 90 days from the date of this proposal. This cost
includes Terracon professional labor costs, travel, direct expenses, subcontractors and analytical
testing required to complete this scope of work using the project assumptions described herein.
The proposal and cost estimate were prepared based on the following assumptions:
Client will provide to Terracon, prior to mobilization, legal right of entry to the site to
conduct the scope of services. Access will be provided to the area(s) of proposed
drilling/sampling.
Client will notify Terracon, prior to mobilization, of any restrictions, special site access
requirements, or known potentially hazardous conditions at the site (e.g., hazardous
materials or processes, specialized protective equipment requirements, unsound structural
conditions, etc.)
Client and/or site representatives shall provide information on the presence and location
of private utilities, operational piping and subgrade features. This scope includes
performing a private utility locate to clear boring locations of subsurface utilities prior to
beginning sampling. Terracon is not responsible for damages related to improperly
marked utilities.
Level D personal protective equipment will be adequate for site work.
We estimate the comprehensive site investigation field activities including soil, soil gas,
and groundwater sampling/surveying will be completed over a period of up to
approximately 4 to 6 weeks, depending on subcontractor availability, weather
conditions, and accumulation of groundwater in the monitoring wells.
If the site data collected indicates that additional site characterization is required before the
evaluation can be completed, a supplemental proposal will be issued to complete the
needed work. The goals of the comprehensive site investigation scope of work will be to
define the extent of impact vertically and horizontally.
Work can be performed during normal business hours (Monday through Friday, 8:00 am
to 5:00 pm).
Traffic control services are not required.
The drilling/sampling locations are readily accessible by Geoprobe® truck- or track -
mounted equipment.
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Proposal for Environmental Services erraeon
Former Grainco FS and City Parking Lot o Yorkville, Illinois im
June 16, 2026 Terracon Proposal 1000008694
Five (Option 1) or six (Option 2) days of drilling for soil borings, installation of monitoring
wells and soil gas points are included.
To avoid delays in the project schedule, Client will ensure that proposed boring,
monitoring well and soil clas point locations are accessible and not blocked by vehicles
or covered by snow or other obstructions.
Disposal of up to six drums of investigation -derived waste soils and/or purge water
(assuming non -hazardous) is included in these costs.
The analytical testing will be conducted on a standard TAT basis (5- to 7-business days)
from receipt of the samples by the laboratory. Analytical testing can be expedited upon
request, for additional fees.
The RAP assumes standard use of dig and haul methods, installation of engineered
barriers, and use of institutional controls. A separate proposal would be required for
submission of Tier 3 ROs, non-standard barrier, active remediation, or building control
technology engineering designs, if required.
This proposal does not include remediation, remediation observation, or RACR
preparation; these activities will be addressed in a supplemental proposal tailored to needs
following site investigation activities and IEPA review.
This proposal does not include closure of the permanent monitoring wells or the two new
soil gas points; a supplemental proposal to properly abandon the monitoring wells and soil
gas points will be provided once no additional groundwater or soil gas sampling appears
necessary based on analytical results and IEPA's review.
IEPA fees for SRP enrollment, document review, and the NFR assessmentlletter are not
included in this proposal. The IEPA's review fees and NFR letter assessment fee are
charged directly to the Remediation Applicant (i.e., the Client).
If any of these assumptions or conditions are not accurate or changes during the project, the stated fee is
subject to change. Please contact us immediately if you are aware of any inaccuracies in these
assumptions and conditions, so we may revise the proposal or fee.
4.0 SCHEDULE
We are prepared to commence work on the project immediately upon receipt of written authorization.
The field activities will be coordinated with the Client and/or their site representatives. It is anticipated
that the installation of the soil borings, monitoring wells, and soil gas points will be completed in five
(Option 1) or six (Option 2) working days, depending on weather conditions and access to the Kendall
County Farm Bureau property. Groundwater and soil gas sampling, and monitoring well elevation
surveying is estimated to take two working days over a time period of approximately two to three weeks,
depending on the presence of groundwater. The standard analytical TAT of 5- to 7- business days has
been budgeted for this project.
Explore with us 10
Proposal for Environmental Services
Former Grainco FS and City Parking Lot 41 Yorkville, Illinois
June 16, 2026 k, Terracon Proposal 1000008694
Terracon
An approximate schedule for the SRP activities included in this proposal is as follows:
n
Supplemental investigation activities
Completion of IEPA SRP Combined Report
— Draft CSIRIRORIRAP
Incorporation of Client comments and IEPA
submittal of final Combined SRP Report
IEPA review of the CSIRIROR/RAP report
Anticipated Time Frame _
Depending on driller availability, the supplemental sampling
activities will be started within approximately two weeks of
receiving Client authorization.
The draft report will be available within approximately six to
eight weeks following Terracon's receipt of the final laboratory
analytical report.
3-5 business days pending Client review time.
90 days per IEPA regulations for IEPA to review
Site cleanup activities will likely take place during site redevelopment. The RACRINFR Letter request
will be prepared upon completion of the site cleanup activities. These efforts are not included in this
proposal.
5.0 LIMITATIONS
Terracon's services will be performed in a manner consistent with generally accepted practices of the
professional undertaken in similar studies in the same geographic area during the same period.
Terracon makes no warranties, expressed or implied, regarding its services, findings, conclusions or
recommendations. Please note that Terracon does not warrant the work of laboratories, regulatory
agencies or other third parties supplying information used in the preparation of the report. These
services will be performed in accordance with the scope of work agreed with you, our client, as set
forth in this proposal.
Findings, conclusions, and recommendations resulting from these services will be based upon
information derived from on -site activities and other services performed under this scope of work; such
information is subject to changeover time. Certain indicators of the presence of hazardous substances,
petroleum products, or other constituents may have been latent, inaccessible, unobservable,
nondetectable or not present during these services, and we cannot represent that the site contains no
hazardous substances, toxic substances, petroleum products, or other latent conditions beyond those
identified during the proposed activities. Subsurface conditions may vary from those encountered at
specific borings or wells or during other surveys, tests, assessments, investigations or exploratory
services; the data, interpretations, findings and our recommendations are based solely upon data
obtained at the time and within the scope of these services.
6.0 AUTHORIZATION
This proposal is valid for 90 days. We appreciate the opportunity to be of continued service on this
project. If this proposal meets with your approval, please sign the attached Change Order No. 2 and
return a copy to our office via email to Mike Lawrence at mike.lawrence(cDterracon.com. The terms,
conditions, and limitations stated in the Agreement for Services and sections of this proposal
Explore with us 11
Proposal for Environmental Services
Former Grainco FS and City Parking Lot a Yorkville, Illinois
June 16, 2026 P. Terracon Proposal 1000008694
Terracon
incorporated therein shall constitute the exclusive terms and conditions and services to be performed
for this project.
Terracon appreciates the opportunity to be of continued service, and we look forward to working with
you on this project. If you should have any questions or comments regarding this proposal, please
contact either of the undersigned.
Sincerely,
Terracon Consultants, Inc.
Jacqueline Setterdahl
Senior Scientist
Michael Lawrence, P.E.
Senior Environmental Engineer
Attachments: Figure 1A — Option 1 - Proposed Supplemental Borings / Wells
Figure 1 B — Option 1 - Proposed Supplemental Borings / Wells
Figure 2A — Option 2 - Proposed Supplemental Borings / Wells
Figure 2B — Option 2 - Proposed Supplemental Borings / Wells
Table 1 — Sampling and Analytical Program — Option 1
Table 2 — Sampling and Analytical Program — Option 2
Change Order No. 2
Explore with us 12
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Reference Number: 1000008694
CHANGE ORDER No. 2
This Change Order No. 2 to the Former Granco Site Environmental Services dated 1110412024 ("Agreement") is between The United City of Yorkville IL
("Client") and Terracon Consultants, Inc. ("Consultant") for additional or changed Services to be provided by Consultant for Client on the Former Grainco FS
and City Parking Lot Project Project, as described in former Grainco Site Environmental Services . This Change Order is incorporated into and made part of
the Agreement.
1. Scope of Services. The scope of the additional or changed Services is described in the Scope of Services section of Consultant's Change Order
Proposal, unless Services are otherwise described below or in Exhibit B to this Change Order (which section or exhibit are incorporated into the Change
Order).
Please refer to attached proposal 1000008694.
2. Compensation. Client shall pay compensation for the additional or changed Services performed at the fees stated in the Change Order Proposal
unless fees are otherwise stated below or in Exhibit C to this Change Order (which section or exhibit are incorporated into the Change Order).
Please refer to attached proposal 1000008694.
All terms and conditions of the Agreement shall continue in full force and effect. This Change Order is accepted and Consultant is authorized to proceed.
Consultant: Terracon Consultants, Inc.
By: /J�ayf 1.11 �--- Date: 6/1612026
Name/Title: J. David Moon I Department Manager
Address: 192 Exchange Blvd
Phone:
Email:
Glendale Heiqhts, IL 60139-2089
(630) 717-4263 Fax: (630) 357-9489
Dave.MoonC@terracon.com
Client: The nited City of Yorkville IL
By: Date:�� ZO
Name/Title: art Olson I City Administrator
Address: 651 Prairie Pointe Drive
Yorkville, IL 60560
Phone: (630) 553-4350 Fax:
Email: bolson@yorkviiie.il.us
Page 1 of 1 Rev. 8-12