HomeMy WebLinkAboutContracts & Agreements_246-2020SECOND AMENDMENT TO AGREEMENT TO PERFORM PROFESSIONAL SERVICES
This second amendment ("Second Amendment") to the agreement for the preparation of
an environmental site assessment for the city of Redlands' Alabama Street septic disposal ponds
(` Agreement") dated October 30, 2018 (` Agreement"), by and between the City of Redlands, a
municipal corporation ("City"), and Rincon Consultants, Inc. ("Consultant"), is made and entered
into this ls` day of December, 2020
RECITALS
WHEREAS, it is the desire of City and Consultant to amend Exhibit A of the Agreement,
titled `Scope of Services, to increase the scope of services to include those described in Exhibit
'1, which is attached hereto and incorporated herein by reference; and
WHEREAS, it is the desire of City and Consultant to amend Article 3.2 of the Agreement
to update the name of the City's representative from former representative Chris Boatman, to the
current representative, Ross Wittman; and
WHEREAS, it is the desire of City and Consultant to also amend Article 5 1 of the
Agreement to increase Consultant's total compensation of thirty four thousand three hundred
fifteen dollars ($34,315), to the amount of two hundred thirty thousand two hundred fifteen dollars
($230,215);
NOW THEREFORE, in consideration of the mutual promises contained herein, City and
Consultant agree as follows:
AGREEMENT
Section 1. The scope of work to be performed by Consultant pursuant to Exhibit A
of the Agreement, titled `Scope of Services, is hereby amended by substituting a new Exhibit
A as identified in Exhibit '1 hereof.
Section 2. Article 3 of the Agreement, titled `Responsibilities of City' is hereby
amended to read as follows:
'3.2 City designates Ross Wittman, Municipal Utilities and Engineering Department
Senior Project Manager, as City's representative with respect to performance of the Services, and
such person shall have the authority to transmit instructions, receive information, interpret and
define City's policies and decisions with respect to performance of the Services.
Section 3 Article 5 of the Agreement, titled `Payment to Consultant, is hereby
amended to read as follows:
'5 1 The total compensation for Consultant's performance of the Services shall not
exceed the amount of two hundred thirty thousand two hundred fifteen dollars ($230,215). City
shall pay Consultant on a time and materials basis up to the not to exceed amount, in accordance
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with Exhibit "B" titled "Cost Proposal," which is attached hereto and incorporated herein by
reference
Section 4. The total compensation for Consultant pursuant to Exhibit "B" of the
Agreement, titled "Cost Proposal," is hereby amended to include the work that is identified in
Exhibit "2 "
Section 5 All other provisions of the Agreement shall remain unchanged by this
Second Amendment and in effect
IN WITNESS WHEREOF, the parties have executed this Second Amendment, to be
effective as of December 1, 2020
CITY OF REDLANDS
By
RINCON CONSULTANTS, INC
Paul W Foster, Mayor Torin Snyder, Principal
ATTEST
e Donaldson, City Clerk
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EXHIBIT '1
AMENDED SCOPE OF SERVICES
Environmental Site Assessment
On May 21, 2017 a fire, later designated The Wash Fire, started in the vicinity of the Santa Ana
River Wash adjacent to the pond location. It is believed that the fire spread to dry vegetation in
the ponds, continued to spread as far as the 210 Freeway and was completely contained by the
City of Redlands and San Bernardino County Fire Departments on May 22, 2017
On May 24, 2017 the Santa Ana Regional Water Quality Control Board (RWQCB) personnel
performed a post -fire inspection of the ponds and surrounding areas. Based on their observations
and the site information collected from the ponds, the RWCQB requested that the City of
Redlands develop a Workplan to perform additional environmental site investigation activities,
for review and approval by Water Board staff. The proposed Workplan is to include an
implementation schedule and a completion report for each of the activities listed below
Consultant shall perform the following scope of work task items:
Task 1 — Pre -Field Activities
1. Workplan. Consultant shall prepare a Workplan outlining the task items listed below for
submittal to and approval from the RWQCB through the City of Redlands.
2. Health and Safety Plan. Prior to the commencement of any field sampling, Consultant
shall prepare a health and safety plan. This plan describes the steps necessary for the field
crew to operate on site in a safe and healthy manner, including steps to minimize exposure
of the crew to potential contaminants. The preparation of such a plan is required by Federal
guidelines for site assessment work. This shall be included as an attachment to the
Workplan.
3. Boring Mark -outs and USA Notification. Consultant shall pre -mark the proposed soil
sample locations with white flags and notify Underground Service Alert (USA) utility
marking service. California law requires this notification no less than 48 hours prior to
drilling, not including the date of notification. The City will provide any information they
may have regarding the presence of underground utilities at the site.
The Consultant shall provide the City with a minimum of two weeks notification prior to
entering the site for field work. The City will in turn notify the RWQCB for any inspection.
Task Deliverables:
➢ Workplan in a draft format for review and preparation of final Workplan based on City
and RWQCB comments.
Task Assumptions
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➢ The City will require one iteration of review comments on the draft Workplan prior to
comment incorporation and Workplan finalization for the City's submittal to the
RWQCB.
➢ RWQCB will require one iteration of review comments on the submitted Workplan
prior to comment incorporation and Workplan finalization.
Task 2 — Imhoff Concrete Tanks Assessment
Perform assessment and characterization of the Imhoff concrete cylindrical tanks 400 feet west
of the pond site to assess the presence of waste materials and contaminated soil, and prepare a
recommendation plan and conceptual design for proper tank abandonment and closure. The two
abutting tanks are cylindrical in shape with V or conical -bottoms and measure approximately 34
feet in diameter and 34 feet in height.
1. Collect Tank Samples. Consultant shall collect samples from four locations inside each
tank at varying depths for a total of 8 samples from the interiors of the two tanks.
2. Sample Analyses. The four samples collected from the contents of each tank will be
composited by the lab into one sample analyzed per tank. Two total samples will be
analyzed for TPH-G, TPH-D and TPH-O by EPA method 8015, polychlorinated biphenyls
(PCBs) by EPA method 8082, Metals by EPA method 6010B/7471A, VOCs by EPA
method 8260B, semi -volatile organic compounds (SVOCs) by EPA method 8270, and
fecal and total coliform and total bacterial plate count by EPA method SM -9221B. In
addition, following conversations with the RWQCB, samples will be analyzed for electrical
conductivity (EC) by saturation paste extract method, pH, and organochlorine pesticides
(OCPs) by EPA method 8081A.
3. Recommendation Plan. Following receipt of the laboratory analytical results, Consultant
shall prepare a recommendation plan and conceptual design for removal and closure of the
Imhoff Concrete Tanks. The Recommendation Plan shall provide a summary of the all field
work performed, outline all tests completed, include all sample results and provide a cost
estimate for the recommended scope. The assessment data will be evaluated with regard
to applicable regulatory criteria and a brief conceptual design will be developed to:
a. Transport and dispose of the contents of the two Imhoff tanks at apermitted facility
b. Properly demolish and/or dismantle the tanks and transport them off site for
recycling and/or disposal, and
c. Sample the soil beneath the tanks, excavate, transport and dispose of contaminated
soil beneath the tanks, if any at a permitted facility Note that the Water Board's
Inspection Report dated 05/24/2017 specifies updated U.S. Environmental
Protection Agency (USEPA) Regional Screening Levels (RSLs) dated June 2017
and new Environmental Screening Levels (ESLs) adopted in February 2016 by the
San Francisco RWQCB for site cleanup.
The Recommendation Plan completed within this task will be made a part of the Site
Assessment Report as outlined within Task 6.
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Task Deliverables:
➢ Recommendation Plan in a draft format for review and preparation of final
Recommendation Plan based on City and RWQCB comments.
Task Assumptions
➢ Consultant will have access to the tank contents without the need for confined space
controls.
> Sampling equipment will not hit refusal prior to sample collection depth.
> Additional analyses will not be necessary for STLC and TTLC for metals. Additional
analyses of samples will not be conducted without discussion with the City
Task 3 — Septage Ponds Assessment
Based on review of the Draft Phase I Environmental Site Assessment and Subsurface
Investigation Report for the Former Septage Ponds Located at the Alabama Street Lease Project
Site, prepared by Woodward -Clyde and dated August 1996, 12 soil borings were completed
within the former ponds. According to the report, the thickness of the sludge varies within and
between the ponds, `For example, the sludge was approximately 3 feet thick in Boring AB -1 and
1 -foot thick in Boring AB -2 [Pond A]. The sludge -soil interface was encountered at
approximately 1 foot below ground surface (bgs) in two of the three borings installed within Pond
B; the sludge thickness in the third boring within Pond B was approximately 3 feet. The sludge
thickness in the two borings (CB -1 and CB -2) installed within Pond C was approximately 3 feet.
The thickness of the sludge encountered in Ponds C 1 and D ranged from 3 to 5 feet.
1. Subtask 3a. Pond Waste Assessment. To determine the depth of waste in the septic
ponds, continuous cores will be drilled up to 10 feet bgs in three locations in each pond,
for a total of 15 borings. The continuous cores will be observed by a geologist to determine
the contact between the septic waste and native soil.
Following a meeting with the RWQCB on August 11 2018, lead was discussed as the main
contaminant of concern. Following guidance from the RWQCB, samples will be collected
at 0.5-feete bgs, 2 feet bgs, and 5 feet bgs. The fifteen soil samples collected at 2 feet bgs
will be analyzed for lead, TPH-O, total organic carbon (TOC) by EPA method TOC 9060A,
EC, and pH. Shallow and deeper samples will be held pending analytical results.
2. Subtask 3b. Methane Gas Assessment. To evaluate the presence of methane gas and
other gases typically associated with decomposition of septic waste, the installation of three
soil vapor probes per septage pond at the depth of 5 feet bgs in each of the aforementioned
exploratory borings, for a total of 15 soil vapor probes. All soil vapor proves installed will
be screened in the field for methane using a 4 -gas meter.
Soil vapor probes will be installed using a Geoprobe direct push rig. Soil vapor probes will
be installed in accordance with the California Environmental Protection
Agency/Department of Toxic Substance Control (DTSC) Active Soil Gas Investigations
Advisory July 2015 The use of this protocol ensures that the sampling procedures and
analytical methods meet the stringent DTSC guidelines. During the sampling procedures,
vacuum integrity of the sampling system is tested prior to and after the soil gas sample is
collected. Leak -down testing is conducted to determine vacuum integrity During
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sampling, for safety purposes, the Consultant shall continuously monitor the site using a
photoionization detector (PID) and a four -gas meter.
Additionally per the Regional Water Quality Control Board's request, carcinogenic
volatile organic compounds (VOCs) will be added to the list of analytes for samples
collected from the soil vapor probes as part of the soil gas assessment for the septage ponds.
A mobile laboratory will be used to collect the soil gas samples and analyze onsite. Field
work will be extended from the original estimate of one day to two day
3. Subtask 3c. Fire Suppression Discharge. To evaluate new waste discharge that may have
occurred as a result of fire suppression, the Consultant shall collect soil samples from each
of the soil vapor probe borings using the Geoprobe rig. Soil samples will be collected from
0.5 feet and 5 feet bgs from the 15 boring locations completed for the Methane Gas
Assessment. Soil samples will be collected using either a Geoprobe or a hand auger and
stored in glass jars provided by the analytical laboratory Each end of the sample will be
covered with a Teflon sheet and a tight -fitting plastic cap. Soil samples will be placed on
ice pending delivery to a state -certified laboratory under chain -of -custody protocol.
Initially the fifteen 0.5 -foot soil matrix samples will be analyzed for PFAAs, and the
deeper samples will be held pending the results. If it is determined that analysis of the
deeper samples is warranted, the Consultant shall test a maximum of one per septage pond.
If further testing is warranted the Consultant shall discuss the additional cost with the City
In addition, per the Regional Water Quality Control Board's request, a laboratory will be
used that will analyze the samples for Perfluorinated Alkyl Acids (PFAAs) following the
Department of Defense (DOD) protocols as part of the assessment of the effect of fire
suppression foam on the septage ponds. The drilling company will use additional levels of
decontamination protocols.
4. Subtask 3d. Recommendation Plan. Following completion of septage pond assessment,
Consultant shall prepare a recommendation plan and conceptual design for both clean -
closure and landfill closure under California Code of Regulations, Title 27 To identify
appropriate measures the Consultant shall review all available documents on GeoTracker
to identify which, if any contaminants were detected in previous assessments in the septage
ponds. Previous and current contaminant concentrations should then be compared to
screening levels. Following review of these data, a closure recommendation and conceptual
design will be prepared for each closure option for selection and future implementation by
the City under a separate contract.
The Recommendation Plan shall provide a summary of the all field work performed,
outline all tests completed, include all sample results and provide a cost estimate for each
recommended scope. The Recommendation Plan completed within this task will be made
a part of the Site Assessment Report as outlined within Task 6.
Task Deliverables:
➢ Recommendation Plan in a draft format for review and preparation of final
Recommendation Plan based on City and RWQCB comments.
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Task Assumptions
➢ Access to the ponds is not limited.
➢ The pond walls are sloped to provide safe access for samplers and equipment.
➢ Ponds are solid and dry and surfaces are stable enough for a motor vehicle to drive
onto the surface of each pond.
➢ The breathing atmosphere in the dry ponds is appropriate for Level C or D PPE.
➢ Additional analyses will not be necessary for STLC and TTLC for metals. Additional
analyses of samples will not be conducted without discussion with the City
➢ Following drilling, all sampling equipment is washed in a soap solution and triple
rinsed. Wash water will be stored in labeled Department of Transportation approved
55 -gallon drums and stored on site pending transfer to a disposal facility The cost for
the disposal of the wash water depends on the results of the assessment. Because we do
not know how the waste material will be disposed, we have included the cost for waste
disposal as part of this proposal under the worst case assumption that it will be
classified as hazardous waste. If the wash water is not classified as hazardous waste the
City will be notified and invoicing will reflect this change.
➢ Previous and current characterizations of the ponds will be sufficient to recommend a
scope for each closure approach, and additional sampling is not required.
Task 4 — Aboveground Storage Tank Assessment
During the site walk by City Staff and the Consultant, the abandoned aboveground storage tank
immediately east of the pond site was observed. Approximate dimensions are ten feet in diameter
by 12 feet tall. The hatch at the top was open and the interior of the steel tank was dry and empty
and reported by the City to have previously stored water.
1 Collect Soil Samples Under Tank. Consultant shall collect two soil samples from under
the tank at one foot below ground surface (bgs) on either side of the tank, augured in at an
angle from the side of the tank.
2. Sample Analyses. The two soil samples from under the tank will be analyzed for TPH-G,
TPH-D and TPH-O by EPA method 8015 polychlorinated biphenyls (PCBs) by EPA
method 8082, metals by EPA method 6010B/7471A, VOCs by EPA method 8260B, semi -
volatile organic compounds (SVOCs) by EPA method 8270, and fecal and total coliform
and total bacterial plate count by EPA method SM -9221B.
3. Recommendation Plan. Consultant shall prepare a recommendation plan and conceptual
design for sampling (if necessary), removal, transport and disposal of the tank at a
permitted facility Consultant shall also prepare a recommendation plan and conceptual
design for removal, sampling, excavation, transport and disposal of contaminated soil
beneath the tank, if any at a permitted facility The Recommendation Plan shall provide a
summary of all field work performed, outline all tests completed, include all sample results
and provide a cost estimate. The Recommendation Plan completed within this task will be
made a part of the Site Assessment Report as outlined within Task 6.
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With regard to the tank itself, Consultant has advised that regulations stipulate that it is the City's
responsibility to characterize the hazardous or non -hazardous nature of the tank, and generator
knowledge can be a factor in this determination. For example see 22 CCR 66262.11(b)(2). It is
an empty dry steel tank open to atmosphere in an arid environment, reported to have been used
for water storage, with no visible residue on the bottom, and which is unlikely to yield meaningful
data from wipe tests. The historic database will be searched for any other information on the past
use of the tank. A permitted Class III landfill will be contacted regarding pre -disposal analytical
testing which may be required pursuant to the landfill's permit.
Task Deliverables:
➢ Recommendation Plan in a draft format for review and preparation of final
Recommendation Plan based on City and RWQCB comments.
Task 5 — Existing Groundwater Monitoring Wells Evaluation
Evaluate the condition of the seven existing groundwater monitoring wells (MW 1A, MW 2,
MW 3 MW -4, MW 5, MW -6, and MW 7). Consultant shall assess the monitoring wells to
provide adequate information to provide a recommendation for rehabilitation or
decommissioning. Assessment will be done by sounding the depths to water and total depths of
the wells and comparing the results with original as -built data. City will provide as much
information as available on the monitoring wells.
1 Recommendation Plan. Consultant shall prepare a recommendation plan and conceptual
design for either remediation or decommissioning of the existing seven monitoring wells
with along with a conceptual plan and cost estimate. The Recommendation Plan completed
within this task will be made a part of the Site Assessment Report as outlined within Task
6.
Task Deliverables:
➢ Recommendation Plan in a draft format for review and preparation of final
Recommendation Plan based on City and RWQCB comments.
Task 6 — Assessment Report
The Assessment Report shall contain an executive summary along with each Recommendation
Plan and an implementation schedule for each Task 1 5 for review and approval by the RWQCB.
Task Deliverables:
➢ Assessment Report in a draft format for review and preparation of final Assessment
Report based on City and RWQCB comments.
Task Assumptions
➢ The City will require one iteration of review comments on the draft report prior to
comment incorporation and workplan finalization for the City's submittal to the
RWQCB.
➢ RWQCB will require one iteration of review comments on the submitted report prior
to comment incorporation and report finalization
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Septage Ponds Sub -surface Investigation
In response to Rincon's Environmental Site Assessment (ESA) Report, dated July 8, 2020 ("ESA
Report"), the RWQCB prepared a comment letter, dated August 13, 2020 ("Comment Letter '),
requesting that the City prepare a CSM for the site to serve as a dynamic planning tool for site
assessment, cleanup, and site closure. The RWQCB has made it clear that additional environmental
assessment(s) at the site are anticipated to address potential data gaps identified in the CSM.
Rincon's objective is to prepare a CSM that will serve as a functional planning tool that will
effectively limit and guide the scope of future environmental assessments at the site in the City's
best interest.
Following the submittal of the CSM to the RWQCB, Rincon will prepare a work plan for a soil
and groundwater investigation at the Septage Ponds that will be consistent with recommendations
described in the CSM and the RWQCB's expectations. Rincon anticipates this will include
excavation of septage pond waste material, disposal of waste material in the City's California
Street Landfill, sampling of shallow and deep native soils in the ponds, and a groundwater
assessment. In addition, the City has asked for support in preparing a Request for Proposal (RFP)
for the excavation, hauling, and disposal of pond waste and the demolition and disposal of the
Imhoff tanks and their contents.
Task 1. Preparation of Conceptual Site Model
Rincon will prepare a CSM that identifies the source area, receptors, and exposure pathways for
the site. The CSM will address location and transport of contaminants as well as potential impacts
to human health, the environment, or beneficial uses of water resources as designated by the Basin
Plan'
The development of a CSM is an iterative and dynamic process that should occur over the project
life cycle. Rincon will prepare a CSM that can be built upon with information obtained during
future site investigations, remedy design, and remedy implementation and optimization.
As described in the ESA Report, the COCs for the site were identified as lead and PFAS. As
described in the Comment Letter, the RWQCB requested that the City prepare a CSM that focuses
on impacts of lead and PFAS and includes the following information:
1. Past and current site uses
2. Current and intended reuse of the site
3. Summary of previous site investigations/assessments
4. Geology and hydrogeology at the site, including depths and thickness of the water -bearing
zones encountered beneath the site, as well as geologic interpretation and cross-sections
along and perpendicular to general groundwater flow direction
5. Actual or potential COC migration pathways and receptors
6. Delineation of vertical and horizontal impacts including iso -concentration contour maps
depicting total concentrations of COCs on plan view and cross sections
7 Potential remedies for source control and containment of COC releases
Water Quality Control Plan for the Santa Ana River Basin, originally published in 1995 and updated in February
2008, June 2011, and February 2016.
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8. Decision criteria in the form of a flow chart to be used as a decision-making tool for site
remedy/closure, and a proposed implementation schedules for the selected remedies
Task 2. Request for Proposal Development
Based on discussions with the City the California Street Landfill may be a feasible disposal
location for the PFAS and lead -impacted septage pond waste material and the Imhoff tank
materials following demolition. Rincon will prepare an RFP document that the City can issue to
prospective bidders to complete the excavation, hauling, and disposal of the septage pond material,
and the demolition, hauling, and disposal of the Imhoff tanks that are present at the Septage Ponds.
The RFP document will include a detailed description of the scope of work, pertinent
environmental data, and the necessary environmental qualifications of prospective contractors with
regards to excavation and hauling of septage pond waste material. Rincon will rely on the City to
provide specific details regarding City contract requirements, prevailing wage, insurance, etc. that
will be included in the RFP
Task 3: Soil and Groundwater Sampling Work Plan
Rincon will prepare a Soil and Groundwater Sampling Work Plan for the proposed scope of field
work for submittal and approval from the RWQCB, which is anticipated to include sampling of
shallow and deep native soils within the footprint of the septage ponds, and the installation and
sampling of up to three groundwater monitoring wells. The scope of work described in the work
plan will be consistent with the recommendations included in the CSM and will meet the
expectations of the RWQCB.
Task 4. Soil and Groundwater Investigation
Rincon will conduct the soil and groundwater investigation consistent with the work plan as
described in Task 2c, following approval by the RWQCB. Because the RWQCB has not yet
reviewed or approved a work plan, at the City's request Rincon is assuming a scope of work that
will likely exceed the RWQCB's requirements for budgeting purposes. The soil and groundwater
investigation will include the following elements:
➢ Health and Safety Plan. Prior to the commencement of any field sampling, Rincon will
update the health and safety plan prepared for the ESA at the Septage Ponds to include
activities associated with the proposed soil and groundwater investigation. This plan
describes the steps necessary for the field crew to operate on site in a safe and healthy
manner, including steps to minimize exposure of the crew to potential contaminants. The
preparation of such a plan is required by Federal guidelines for site assessment work.
➢ Boring Mark -outs and USA Notification: Rincon will pre -mark the proposed soil sample
and monitoring well locations with white flags and white spray paint and notify
Underground Service Alert (USA) utility marking service prior to performing soil and
groundwater sampling. California law requires this notification no less than 48 hours prior
to drilling, not including the date of notification.
➢ Monitoring Well Installation and Soil Sampling: Rincon proposes that three
groundwater monitoring wells are installed in three of the four onsite septage ponds.
Groundwater is assumed to be at 240 feet below ground surface (bgs). A continuous coring
method will be used to log the borings until groundwater is reached. In addition, soil
samples will be collected at 100, 150, 200, and 240 feet bgs (12 total samples). The three
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monitoring wells will be surveyed by a licensed land surveyor. Installation of the three
monitoring wells is expected to take eight days to complete.
➢ Monitoring Well Development and Groundwater Sampling: The three monitoring
wells will be developed prior to groundwater sampling. One groundwater sample will be
collected from each monitoring well, no less than three days after well development.
Development of the monitoring wells is expected to take three days, and collection of soil
samples is expected to take two days to complete.
➢ Soil Sampling: Rincon proposes to advance one boring within each of the four onsite
septage ponds, for a total of four borings. The borings will be advanced with a track
mounted CME -95 drill rig to approximately 85 feet below ground surface. Initially seven
soil samples will be collected from each boring at 1, 5, 10, 20, 30, 40, and 50 feet bgs. Up
to five additional samples may be collected at depths up to 85 feet bgs for a total of 33 total
samples. Soil sampling is expected to take four days to complete.
➢ Soil and Groundwater Sample Analysis: To be conservative, Rincon estimates that the
three groundwater samples and all of the soil samples collected (45 total soil samples and
three total groundwater samples) will be analyzed for contaminants of concern (COCs),
including lead and PFAS. In addition, Rincon assumes that 20 percent of the soil samples
will undergo Soluble Threshold Limit Concentration (STLC) testing for up to two metals
(19 total STLC tests), and that an additional 10 percent of the samples will undergo Total
Threshold Limit Concentration (TCLP) testing for up to two metals (10 total TCLP tests)
to characterize the pond waste for potential disposal purposes.
As a standard practice, Rincon prefers to take a phased approach to sample analysis. Rincon
has developed a cost estimate consistent with the analytical program described above,
however would recommend taking a scaled back approach depending on initial analytical
results to reduce costs. For example, in the case of PFAS assessment in soils, Rincon would
recommend analyzing several surface (0.5 or 1 foot) samples initially and would only
recommend further analysis of deeper samples if detectable concentrations exceeded
applicable screening levels in surface samples.
Task 5: Meetings and Project Management
Rincon anticipates three one-hour meetings with the City and/or the RWQCB will be required to
review the CSM, and to develop and finalize the work plan for soil and groundwater assessment
at the Septage Ponds. In addition, administrative project management costs are included in this
task.
Task Assumptions
Rincon has made the following assumptions in the preparation of this proposal.
➢ The number of proposed soil boring and groundwater monitoring wells are subject to
change pending discussions with the RWQCB.
➢ Rincon is not responsible for any damages to underground improvements not clearly or
accurately marked by the City Rincon will contact DigAlert for utility mark -outs;
however, it should be noted that DigAlert often does not mark the location of subsurface
utilities located on private property If Rincon damages any subsurface utility or structure
that is not identified by the City then the City will assume the cost and all liability related
to repair and injury that may occur as a result of such an occurrence.
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➢ The subsurface is amenable to sampling using the methods described in this proposal and
the sampling can be completed in the specified time frame. Rincon will advise the City of
any necessary revisions to the work scope as well as additional costs, if required.
➢ All areas of the site are accessible, and access will be secured by the City
➢ Laboratory analytical costs included in this proposal assume a standard turnaround time of
seven to ten days. Laboratory analysis may be expedited for an additional fee.
➢ The CSM will be used to identify data gaps to be addressed with additional site
assessment(s), and is considered a living document. Future amendments to the CSM
following the collection of additional site data are not included in this proposal.
➢ Material will be removed such that a drill rig will be able to access each of the soil sampling
and groundwater monitoring locations.
➢ Preparation of the RFP for the Septage Ponds will not exclude Rincon from eligibility to
submit a proposal to perform the investigations.
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EXHIBIT '2'
AMENDED COST PROPOSAL
Tank, 1vLro ent0ite'Assess 'eIJt,
Task 1-6: Environmental Site Assessment
:ask: Septage Pond, SbSurface Investigation'.
Task 1.' Preparation of Conceptual Site Model
Task 2: Request for Proposal Development
Task 3: Soil Sampling Work Plan
Task 4. Soil and Groundwater Investigation
Task 5: Meetings and Project Management
Contingency: 20 -percent
$34,315
$7,600
$5,500
$4,300
$137 400
$2,800
$38,300
TOTAL PROJECT BUDGET
$230,215
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