R15-149 RESOLUTION NO. R15 -149
N A RESOLUTION OF THE CITY OF BOYNTON BEACH,
M FLORIDA, APPROVING TWO TASK ORDERS WITH CH2M FOR
A THE PURPOSE OF EVALUATING GROUNDWATER
i CONDITIONS, TASK ORDER R13- 063 -08 AND FOR THE DESIGN
i AND OVERSIGHT OF LANDFILL COVER REPAIR, TASK
1 ORDER R13- 063 -09, BOTH OF WHICH ARE IN ACCORDANCE
• WITH THE CITY'S HYDROGEOLOGICAL CONSULTING
1 . SERVICES AGREEMENT EXTENSION THAT WAS APPROVED
11 BY THE CITY COMMISSION; AUTHORIZING THE CITY
1. MANAGER TO SIGN THE TASK ORDERS ON BEHALF OF THE
II
14 CITY; AND PROVIDING AN EFFECTIVE DATE.
11
1;
WHEREAS, Task Order R13- 063 -08, in the amount of $166,834.58, contemplates
1 1 continued evaluation of ground water conditions with an emphasis on identification of the
1: source of arsenic; and
1 i WHEREAS, Task Order R13- 063 -09 in the amount of rovides 47 126.26
$ � provides
professional design and oversight services for the creation of bid documents to repair the re
p � � P
2 landfill cover according to Health Department Standards; and
2P. WHEREAS, the City Commission of the City of Boynton Beach upon
2i recommendation of staff, deems it to be in the best interest of the citizens of the City of
2! Boynton Beach to approve Task Orders R13- 063 -08 in the amount of $166,834.58 and Task
3'n pP
25. Order R13 063 - 09 in the amount of $47,126.26, both with CH2M regarding the landfill.
2 NOW, THEREFORE, BE IT RESOLVED BY THE CITY COMMISSION OF
21 THE CITY OF BOYNTON BEACH, FLORIDA, THAT:
2: Section 1. The foregoing "Whereas" clauses are hereby ratified and confirmed as
M n upon adoption
2. being true and correct and are hereby made a specific part o f this Resolutio upo adopt o
3! hereof.
3 Section 2. The City Commission hereby approves Task Order R13- 063 -08 in the
S: \CC \WP \Resolutions\2015 \R15 -149 - Task Orders - CH2M - Landfill.doc
e amount of $166,834.58 and Task Order R13- 063 -09 in the amount of $47,126.26, both with
i ardi the landfill and authorizes the City Manager to sign the Task Orders ,
g g tY g �
I CH2M re copies of which are attached hereto as Exhibits "A." and `B"
3: Section 3. This Resolution shall become effective immediately upon passage.
3 i PASSED AND ADOPTED this 1 day of December, 201
y 2015.
5
31 CITY OF BOYNTON BEACH, FLORIDA
3;
3M YES NO
4
41 Mayor — Jerry Taylor ✓
4
41 Vice Mayor — Joe Casello
1
4: Commissioner — David T. Merker ✓'
4:
4 1 Commissioner — Mack McCray
4:
4! Commissioner — Michael M. Fitzpatrick
51
5 _
5• VOTE �— 0
5
5 h ATTEST:
51
5 I. � I a/t .__4 _
5 J. - t M. Prainito, MMC
5 ` '
I ity Clerk
6
6; ( . r Seal)
6 ' to ,
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Task Order No. R1 3-063-09
Boynton Beach Landfill Post - Closure Maintenance Assistance
A. Background
Since 2010 CH2M HILL Engineers, Inc. (CH2M) has assisted the City of Boynton Beach (City) with the
preparation and certification of semi - annual groundwater sampling reports for the City's Class I landfill
(Landfill) in accordance with the Palm Beach County Health Department (PBCHD) Permit Number
124522 - 005 -SF for post - closure monitoring. Additionally, CH2M helped the City develop a groundwater
investigation program, accepted by the PBCHD, designed to evaluate a decision to cease long -term
groundwater monitoring. The hydrogeologic investigation is expected to take place during Fiscal Year
2015/16; this investigation is not considered as part of this scope of work.
Concurrently, CH2M's proposed scope of work in this proposal is aligned with the City's goal to meet
regulatory guidelines by repairing sections of final cover damaged by erosion during the long -term care
period of the City's Landfill. The professional services consist of the following activities, which are
detailed in the Scope of Work:
• CH2M will conduct a brief site visit to review the findings of the September 3, 2015 Florida
Department of Environmental Protection Inspection Checklist.
• CH2M will convene a teleconference with Florida Department of Environmental Protection
(FDEP) officials to confirm the process and requirements to obtain regulatory approval for
required remedial actions prior to the City procuring a qualified contractor and commencing
repairs to the final cover system;CH2M will facilitate a teleconference with the City and the Lake
Worth Drainage District (LWDD) to discuss procurement of access approval and to memorialize
any LWDD permit or restoration requirements in the procurement package prepared by the
City;
• CH21VI will prepare a written corrective action plan (CAP) as required by Question 3.4 in the
September 3, 2015 Florida Department of Environmental Protection Inspection Checklist. It is
assumed that the design criteria package including a grading plan will serve as the basis for the
CAP, which will be submitted to FDEP by the City.
• CH21VI will prepare a design criteria package, which will be included in the procurement package
prepared by the City;
• CH21VI will prepare an opinion of probable construction cost based upon estimated quantities.
The estimate will include mobilization / demobilization, granular fill, topsoil, and sod or seed
covering;
• CH21VI will serve as a technical resource during the bid review process; and
• CH21VI will provide limited services during construction including submittal reviews and field
observation necessary to prepare the certification of construction completion documentation at
the conclusion of the project for submission to FDEP..
PAGE 1 OF 7
B. Scope of Services
The scope of services included in this authorization are as follows:
Task 1 —Site Visit and Teleconference with FDEP
CH2M will conduct a brief site visit with City staff to review the findings of the September 3, 2015
Florida Department of Environmental Protection Inspection Checklist. CH2M will then facilitate a
teleconference with the City and FDEP to confirm the requirements to obtain regulatory approval for
required remedial actions prior to commencing repairs to the final cover system. CH2M will prepare a
meeting agenda for distribution and discussion with attendees. The teleconference is expected to last
up to two (2) hours. Following the meeting, CH2M will prepare a draft meeting summary, identifying
critical discussion points for review and comment by all participants.
For budgetary purposes, it is assumed the Principal, Senior Project Manager and Project Manager will
participate in the teleconference on behalf of CH2M.
Deliverables
w Agenda, electronic
- Draft and Final Meeting Summary (draft for review by all)
Task 2 — Teleconference with LWDD
CH2M will facilitate and participate in a teleconference with the City and LWDD representatives to
negotiate access approval to the site and address any LWDD requirements in the procurement package
prepared by the City.
For budgetary purposes, it is assumed the Principal and Senior Project Manager will participate on
behalf of CH2M.
Deliverables
- Agenda, electronic
- Draft and Final Meeting Summary (draft for review by all)
Task 3 — Produce Bid Package and Bid Form
CH2M will prepare a written corrective action plan that will serve as the basis for the bid package that
includes construction drawings, technical construction specifications, a site plan that delineates the
work limits and a grading plan. The bid package will be incorporated into the procurement package
prepared by the City.
It should be noted that CH2M will need to obtain current topographic information from the City to
prepare preliminary design drawings. It is assumed that the City will engage a qualified surveying firm to
perform a pre- construction survey. CH2M will provide technical assistance to the City to develop the
scope of work for the selected surveying firm. Using the pre- construction survey, CH2M will develop
plans for construction of the final cover of portions where erosion damage has occurred and will include
standard erosion control drawings or FDOT call outs (e.g., silt fence, hay bales) where needed.
PAGE 2OF7
CH2M will prepare and submit a draft bid package for the City's review and comment. For budgetary
purposes, it is assumed that the Senior Project Manager and Project Manager will participate in a
teleconference with the City following the draft submittal to discuss written comments received from
the City and respond to questions. The City is requested to provide one set of consolidated written
comments prior to the teleconference. CH2M will respond to the City's comments to finalize the bid
package that will be incorporated into the procurement package prepared by the City.
Once the bid package has been approved by the City, CH2M will provide electronic files. CH2M will
prepare a bid form in MS -Word format for inclusion in the City's front -end documents.
Deliverables
— Draft and final corrective action plan.
— Draft and final bid package.
— Bid Form.
Task 4 — Prepare an Opinion of Probable Construction Cost
CH2M will prepare an opinion of probable construction cost based upon estimated quantities. The
estimate will include mobilization /demobilization, granular fill, topsoil, and sod or seed covering. Bid
quantities will be based upon either LS, CY or SY as appropriate.
CH2M will perform a quantity take -off based on the best available information, including the most
recent FDEP Inspection Report.
Deliverable
- Opinion of Probable Construction Cost based upon estimated quantities.
Task 5 — Contractor Selection Assistance
CH2M will assist the City as a technical resource during the bid evaluation phase. Activities include
attending the pre -bid meeting and providing technical input during the evaluation including responding
to bidder questions and preparing addenda. Once bids are received, CH2M will review the bids
submitted and provide a summary for City consideration prior to contractor selection. CH2M will
conduct a teleconference with the City to discuss pro and cons, as well as any outstanding issues related
to CH2M's technical review.
Deliverables
- Attend pre -bid meeting.
Respond to bidder questions and provide technical input to addenda.
- Prepare draft and final bid evaluation summary memorandum.
PAGE 3 OF 7
Task 6 — Services During Construction
CH2M will provide services during construction including reviewing and responding to up to fifteen (15)
contractor submittals including the location of the borrow pit(s) where granular material and topsoil will
be obtained. CH2M's field support includes daily observation by one CH2M staff member (4 hours) for
10 days.
Following project completion, CH2M will draft, finalize and submit to FDEP an application for
certification of construction completion, signed and sealed by a professional engineer, at the completion
of this project.
A draft of the application for certification of construction completion will be submitted for review and
comment by the City. CH2M will adjudicate City comments and finalize the application prior to
submission to FDEP. Following submittal to FDEP, CH2M will respond to up to 2 (two) Requests for
Additional information within this task order. Upon acceptance by FDEP, the Certification of
Construction Completion should be placed in the operating record.
Deliverables
- Submittal Review Forms
Submittal Tracking Log
- Construction Logbook
- Draft and final certification of construction completion for submission to FDEP
- Response to up to 2 (two) Requests for Additional information
C. Assumptions
This estimated cost is based on the following assumptions:
• Additional meetings with the City, FDEP, PBCHD or the contractor are not included in this scope
of services.
• The City will be responsible for satisfying any site access requirements negotiated under Task 2.
• The City will complete the site survey by December 4, 2015.
• The City will be responsible for managing the procurement process and meeting the timelines
presented in the Consent Order.
• The City will review and provide comments on the draft Bid Package and draft Bid Form within
one (1) week of submittal by CH2M.
• The City will be responsible for submitting all required documents to the PBCHD as specified in
the Consent Order.
• CH2M is not responsible for City nor contractor delays that result in penalties specified in the
Consent Order.
• No subcontractors will be utilized by CH2M during the delivery of the scope included herein.
• The City is responsible for continuing the yearly maintenance program implemented for the post
closure monitoring period as specified in the Consent Order.
• If the duration of the selected Contractor's work is greater than the time assumed in this Task
Order or if the City self - performs some of the inspections during construction, the level of effort
for the services during construction may be amended.
PAGE 4 OF 7
D. Contract Reference
This Task Order shall be performed under the terms and conditions described within the Agreement
titled Hydrogeological Consulting Services, dated August 19, 2013, between the City of Boynton Beach
and CH2M Hill Engineers, Inc., as amended.
E. Compensation
Compensation by the City to CH2M will be on a time and materials basis in accordance with the above -
mentioned Agreement. The estimated compensation for the services described in this Task Order is
$47,126.26 as presented in Table 1.
TABLE 1.
TASK HOURS RATE TOTAL
1. Site Visit and Teleconference with FDEP
Engineer 12 $120.00 $1,440.00
Senior Engineer 2 $155.00 $310.00
Senior Project Manager 4 $208.14 $832.56
Expenses $150.00
SUBTOTAL $2,732.56
2. Teleconference with LWDD
Engineer 4 $120.00 $480.00
Senior Engineer 2 $155.00 $310.00
Senior Project Manager 4 $208.14 $832.56
Expenses $0.00
SUBTOTAL $1,622.56
3. Produce Design Criteria Package and Bid Tab
Office
6
$86.22
$517.32
Engineer
60
$120.00
$7,200.00
Senior Engineer
10
$155.00
$1,550.00
Senior Project Manager
17
$208.14
$3,538.38
Expenses
$0.00
SUBTOTAL
$12,805.70
4. Prepare an Opinion of Probable Construction Cost
Engineer
14
$120.00
$1,680.00
Senior Engineer
2
$155.00
$310.00
Senior Project Manager
4
$208.14
$832.56
Expenses
$0.00
SUBTOTAL
$2,822.56
S. Contractor Selection Assistance
PAGE 5OF7
Office 6
$86.22
$517.32
Engineer 16
$120.00
$1,920.00
Senior Engineer 12
$155.00
$1,860.00
Senior Project Manager 16
$208.14
$3,330.24
Expenses
SUBTOTAL
6. Services During Construction
$100.00
$7,727.56
Office 40
$86.22
$3,448.80
Engineer 80
$120.00
$9,600.00
Senior Engineer 4
$155.00
$620.00
Senior Project Manager 18
$208.14
$3,746.52
Expenses
SUBTOTAL
TOTAL
$2,000.00
$19,415.32
$47,126.26
F. Schedule
CH2M estimates that its scope of work will be completed as presented below in Table 1. Every effort
will be made to expedite the completion of the tasks.
Table 1
Prniert Schedule
Activity
Target Completion Date
Notice to Proceed issued to CH2M
December 2, 2015
Site Visit and Teleconference with FDEP
December 31, 2015
Teleconference with LWDD
January 8, 2016
Draft Bid Package and Bid Form
January 29, 2016
Final Bid Package and Bid Form
February 12, 2016
Submit an Opinion of Probable Construction Cost
February 12, 2016
City Advertises Bid Pursuant to the Consent Order
March 4, 2016
Contractor Selection Assistance
April 22, 2016
Services During Construction
June 24, 2016
PAGE 6 OF 7
G. Authorization
APPROVED BY:
CITY OF BOYNTON BEACH, FLORIDA
By: m. .
Q�. �.. V3 "
Dated this S day of NovL- rbtT - 2015.
SUBMITTED BY:
CH2M
By.
Matthew B. Alvarez, PE
Vice President and Area Manager
Dated this 6 day of November, 2015
APPROVED AS TO FORM:
.N .�.
CITY
PAGE 7 OF 7
F -kqg
Task Order No. R13- 063 -08
Professional Hydrogeologic Services for Investigating the
Origin of Arsenic in Groundwater at the City of Boynton Beach
Landfill, Palm Beach County Health Department Permit 124522 -
005-SF
A. Background
Since 2006 groundwater sampled semiannually at monitoring wells surrounding the City of
Boynton Beach (City) Municipal Landfill (BBLF) has displayed concentrations of arsenic
exceeding the Florida Department of Environmental Protection's (FDEP) Groundwater Cleanup
Target Level (GCTLs) of 10 micrograms per liter (µg /L). Over the monitoring period, the highest
concentrations were observed in MW -12, reaching a maxima of 311 pg /L in October 2007.
Under FDEP Solid Waste Permit No. 124522 - 005 -SF, BBLF completed a 20 -year period of post
closure monitoring in February 2012, followed by multiple extensions, which include ongoing
semiannual sampling events. As specified under Florida Administrative Code (FAC)
Chapters 62 -701 and 403, following post - closure monitoring, if concentrations of water quality
constituents remain above the GCTL's, FDEP may require the facility to undergo compliance
evaluation and corrective action measures. These measures can involve expensive, long term
actions including the remediation of groundwater, until constituent concentrations meet
GCTL's.
However, a groundwater study funded by the City at the adjacent (west) Links at Boynton
Beach golf course in 2012 revealed similar results to BBLF, with concentrations of arsenic in
groundwater exceeding GCTL's at six of 12 monitoring wells involved in the study. Moreover,
concentrations in monitoring wells from the golf course exceeded the historic maxima at the
BBLF by over one order of magnitude. Similarly, an investigation of arsenic in groundwater
samples from local (supply and monitoring) wells contained in the National Water Institute
System (NWIS) and DBHYDRO databases maintained by the United States Geological Survey
(USGS) and South Florida Water Management District, respectively, revealed multiple wells
exhibiting arsenic concentrations exceeding the GCTL. Maximum concentrations obtained from
the databases reached 207 ug /L, at a well less than five miles east of BBLF.
Constituents analyzed in characterizing the geochemistry of the shallow groundwater at the
golf course, and the NWIS and DBHYDRO databases suggests conditions are favorable to the
reductive dissolution of iron, a major contributor to elevated arsenic concentrations in
groundwater worldwide. Arsenic occurs naturally in groundwater from shallow aquifers,
comprised of recent sediments, in large regions of Bangladesh, West Bengal, Taiwan, and
Cambodia, along with areas of the United States (northern New York, New Hampshire,
Wisconsin, Minnesota, and California). A natural origin for arsenic in groundwater holds
important implications for post - closure activities at BBLF, particularly regarding potential future
remedial measures required of the City.
The appearance of elevated concentrations at BBLF, the gold course, and the surrounding area
(NWIS and DBHYDRO databases) implies a more wide - ranging natural cause for arsenic in
groundwater than potential anthropogenic causes at BBLF. To test this hypothesis, in late 2013
the City funded development of a sampling plan designed to characterize geochemical
conditions in groundwater at BBLF and their contribution to the natural occurrence of arsenic.
The Palm Beach County Board of Health ( PBCBH) and Florida Department of Environmental
Protection (FDEP) reviewed and endorsed the sampling plan with minimal comment.
This proposal describes the scope of work, costs, and schedule for CH2M to execute the field
investigation outlined in the sampling plan. Comprising four quarters of groundwater
sampling, the investigation will follow the FDEP's Guidance for Comparing Background and Site
Chemical Concentrations in Groundwater (Guidance), in demonstrating that elevated arsenic in
groundwater represents an ambient condition in the Surficial Aquifer. The investigation will
also focus on the geochemical origins of arsenic in groundwater.
The original sampling plan submitted to PBCHD in September 2013 described 12 monitoring
wells including the eight monitoring wells from BBLF, and four (MW -2 through 4, and MW -8)
from the golf course. As part of the BBLF study, the four monitoring wells from the golf course
complied with FDEP's Guidance for Comparing Background and Site Chemical Concentrations in
Groundwater, which requires three monitoring wells located hydraulically up or side gradient
from the subject facility and intended to monitor ambient water quality in the subject aquifer.
Water quality from the ambient wells are combined in statistical analyses with analytical data
from wells at the facility. The fourth well provides an additional point for characterizing
ambient water quality, or an alternative to one of the other three wells for applying the
analyses.
The golf course monitoring wells involved in the 2012 study were abandoned, including the
wells selected for BBLF's arsenic study, during summer 2014. Although conducting the study
without the wells from the golf course can still reliably determine the geochemical origin of
arsenic, the study will not fit into a regulatory framework that supports proclaiming a natural
origin for arsenic, and reducing the City's future obligations. Accordingly, to meet the
requirements of FDEP's guidance, CH2M will install four replacement monitoring wells at the
golf course within 5 to 10 feet of the former locations of MW -2 through 4, and MW -8.
B. Scope of Services
CH2M's scope of work will consist of the following five tasks:
Task 1- Prepare for Drilling and Sampling Events
Task 2- Install Monitoring Wells at the golf course
Task 3- Conduct Quarterly Sampling Events
Task 4 -Data Reduction and Analysis
Task 5- Prepare Investigation Report
Task 6- Regulatory Support
Task 1 Prepare for Drilling and Sampling Events
Task 1 will entail preparing personnel and equipment for the four quarters of sampling at BBLF. This
effort will involve the following activities:
• Conducting a site visit to BBLF and the golf course
• Locating monitoring wells at the golf course
• Obtaining pricing and subcontracting a laboratory licensed in Florida
• Obtaining pricing and subcontracting a drilling contractor licensed in Florida
• Procuring sampling equipment
• Obtaining instrumentation to measure important field chemistry parameters
• Obtaining access to locations on the golf course
Properly preparing for installing four monitoring wells and the quarterly sampling investigation will
ensure that field efforts will proceed with minimal concerns, or problems. Conducting a site visit will
prove important in siting the replacement monitoring wells, identifying methods to measure
synoptic water levels, efficiently sampling monitoring wells at both sites, and disposing of purge
water.
Task 2 Install Monitoring Wells at the Links at Boynton Beach Golf Course
After subcontracting a qualified drilling firm, CH2M personnel will supervise the installation of the
four new monitoring wells adjacent to the former locations of MW -2, MW -3, MW -4, and MW -8 at
the golf course, re- designating the well numbering as MW -213, MW -3R, MW -4R, and MW -8R. Well
depths and screen lengths will reproduce the elevations and dimensions of the original wells,
respectively. Qualified CH2M staff will describe the lithology of samples recovered during drilling,
and supervise construction of the monitoring wells.
A critical element of a groundwater monitoring program will entail collecting samples free of
sediment and turbidity. Accordingly, the driller contractor will execute an aggressive mechanical
development effort involving both swabbing and pumping techniques. CH2M personnel will
oversee development of each monitoring well. Obtaining the most representative samples may
require developing a single monitoring well for one to two days.
CH2M will prepare a memorandum describing the drilling, monitoring well installation and
development activities. The memorandum will contain boring logs with lithological descriptions,
monitoring Well construction diagrams, and development forms.
Task 3 Conduct Quarterly Sampling Events
Under Task 2, CH2M will conduct four quarters of groundwater sampling over a 12 -month period.
CH2M will collect samples from the eight remaining monitoring wells at BBLF, and MW -2, MW -3,
MW -4, and MW -8 at the golf course (Table 1). These quarterly sampling events will supplant the
post - closure monitoring sampling over the 12- months of this study.
In addition to the 12 groundwater samples, CH2M personnel will collect one field duplicate, a matrix
spike /matrix spike duplicate (MS /MSD) and one equipment blank during each of the four quarterly
events. The MS /MSD will get collected at the same monitoring well as the field duplicate. Prior to
each sampling event, personnel will collect one equipment blank by passing distilled water through
the tubing used with the peristaltic pump to purge the monitoring wells.
In following FDEP's Guidance for Comparing Background and Site Chemical Concentrations in
Groundwater, the field investigation will incorporate a minimum of three background monitoring
wells set in the Surficial Aquifer located side or up- gradient from BBLF, quarterly samples collected
over one year, along with simple and statistical evaluation of site and background data.
A Florida - certified laboratory will analyze all samples for total arsenic and dissolved arsenic over
each of the four quarters. Samples collected during the first and fourth quarters, will get analyzed
for a comprehensive list of water quality parameters, with a smaller list of analytes for the second
and third quarters (Tables 2 and 3). CH2M will purge the wells according to most recent version of
the FDEP Standard Operating Procedure (DEP -SOP 001/01), dated March 2008. The crews will
discharge purge water onto the ground surface topographically downgradient of each monitoring
well.
Sampling crews will measure and record important water quality parameters on the field parameter
data sheets. These parameters will include temperature, pH, conductivity, DO, oxidation - reduction
potential (ORP), sulfate, sulfide, total iron, ferrous iron, manganese, alkalinity, and turbidity.
Moreover, the sample crews will measure the depth -to- waterto water at each well overthe four
quarterly sampling events. The surface water stations at SW -E -3 and SW -L -20 will remain in service
for obtaining surface water elevations.
TABLE 1
Summary of Monitoring Wells Used for the Study
BBLF Links at Boynton Beach Golf Course
MW -12
MW -2 R
MW -15
MW -3 R
MW -18
MW-4 R
MW -19
MW -8 R
MW -A -3
Turbidity
MW -B -3
MW -C -3
mg /L.
MW -D -3
Field Iron (ferrous)
TABLE 2
Summary of Field and Laboratory Water Quallty Test Res — Quarters 1 and 4
Sample ID Constituent Units Federal Drinking Water Standards
pH standard units 6.5-8.5
Eh (corrected) my
Specific Conductivity
emhos
Dissolved Oxygen
mg /L
Temperature
°C
Turbidity
NTU
Field Sulfate
mg /L.
250
Field Iron (ferrous)
mg /L
0,3
Field Iron (total)
mg/L.
0.3
Field Manganese
mg/L.
0.05
Field Alkalinity
mg /L
Field Sulfide
mg/L.
Aluminum dissolved
mg/L.
0.2
Aluminum total
mg/L.
0.2
Arsenic dissolved
mg/L.
0.005
Arsenic total
mg/L.
0.005
Iron (dissolved)
mg/L.
0.3
Iron (total)
mg/L.
0.3
Manganese dissolved
mg /L
0.05
Manganese total
mg/L.
0.05
Magnesium total
mg/L.
5
TABLE 2
Summary of Field and Laboratory Water Quality Test Results — Quarters 1 and 4
Sample ID Constituent
Units
Federal Drinking Water Standards
Potassium total
mg /L
Sodium total
mg /L
50
Calcium total
mg/L.
Sulfate
mg /L
250
Chloride
mg/L.
250
Alkalinity
rng /L
250
Ortho- Phosphate
mg /L
0.3
Totai Phosphorous
mg /L
0.3
Nitrate as N
mg/L.
10
Total Kjeldahl Nitrogen
mg /L
Ammonia
mg /L
Fluoride
mg/L.
2 . 0
Silica
mg/L.
Totai organic carbon
mg /L
Total dissolved solids
mg /L
500
Total suspended solids
mg/L.
Hardness
mg/L.
TABLE 3
_Summary of Field and Laboratory Water Quality Test Results — Quarters 2 and 3
Sample ID Constituent Units Federal Drinking Water Standards
pH
standard units
6.5-8.5
Eh (corrected)
my
Specific Conductivity
emhos
Dissolved Oxygen
mg /L
Temperature
°C
Turbidity
NTU
Field Sulfate
mg/L.
250
Field Iron (ferrous)
mg /L
0.3
Field Iron (total)
mg /L
0.3
Field Mangarese
mg/L.
0.05
Field Alkalinity
mg /L
Field Sulfide
mg /L
6
TABLE 3
Summary of Field and laboratory Water Quality Test Results — Quarters 2 and 3
Sample ID Constituent Units Federal Drinking Water Standards
Arsenic disso!ved mg /L 0.005
Arsenic total mg /L
0.005
Task 4 Data Reduction and Analysis
Characterizing the results of the field investigation data from Task 2 represents an important step in
determining the origin of arsenic in groundwater at BBLF. Accordingly, Task 3 will entail evaluating
hydrologic results, statistical analyses following FDEP's guidance, geochemical evaluations of redox
conditions, potential arsenic bearing minerals, and mechanisms for arsenic release.
Analysis of hydrologic results will comprise characterizing groundwater flow directions, and
hydraulic gradients for individual sampling events, along with the changing potentiometric surfaces
over the four events. Most importantly, CH2M will describe the hydrologic relationship between the
BBLF and the golf course to document that the upgradient monitoring wells remain the same for
each event,
Upon receipt of sample results from the laboratory, CH2M's project chemist will validate the data to
verify that proper field, sample management, and laboratory protocols were followed. After
validation, evaluation of the water quality data will involve applying deterministic statistics (mean,
mode, median, standard deviation, etc.), and other tests to better understand temporal trends in
selected parameters. In following FDEP's Guidance, project personnel will review laboratory data for
arsenic using the "Simple Approach for Comparing Site and Background Data" along with a statistical
approach like the student — t test, or the Mann - Whitney Test. Both techniques can test the null
hypothesis when comparing two populations.
As data from the golf course, NWIS, and DBHYDRO suggests elevated arsenic is related to the
reductive dissolution of iron, CH2M will apply several analytical techniques to evaluate redox
conditions at BBLF. In addition to field measurements of the oxidation - reduction potential (ORP),
CH2M will employ a method developed by Stuyfzand (1993) and the Redox- Assignment program
(McMahon et Al, 2009) in identifying the prevalent redox processes.
CH2M may evaluate release mechanisms for arsenic (ex: sulfide oxidation, reductive dissolution of
iron, competitive adsorption, desorption with elevating pH, etc.) using thermodynamic equilibrium
models like PHREEQC (Parkhurst, 1994), or MINTEQA2 (Allison, 1991). By calibrating the models to
conditions at BBLF, CH2M can run simulations that predict how arsenic concentrations respond to
varying geochemical conditions. As an example, the redox chemistry of groundwater can vary with
seasonal changes in recharge and water table elevations, causing arsenic concentrations to
fluctuate. Calibrating a model like PHREEQCto site conditions allows predicting a range of arsenic
concentrations with time.
CH2M will test the sensitivity of the modeled solution to changes in critical input parameters. Using
this approach, sensitivity testing will quantitatively assess the uncertainty of the modeled solution.
Task 5 Prepare Investigation Report
CH2M will prepare a draft groundwater investigation report following collection of the fourth
quarterly round of sampling. The report will contain the results of synoptic surveys, water quality
sampling, a geochemical evaluation, modeling, and recommendations for future activities. CH2M
will submit one electronic and five hard copies of the report to the City for review by the staff of the
engineering department, Palm Beach County Health Department (PBCHD) and FDEP. We will
incorporate comments into a final version of the report, and submit one electronic, and five hard
copies to the City.
Task 6 Regulatory Support
Under Task 5, CH2M will provide the City with regulatory support as required during this project. For
costing purposes, we assume CH2M will perform the following activities during Task 5:
• One telephone conference (2 hours) with regulators from PBCHD and /or FDEP prior to
initiating field work.
• Preparing a memorandum following each sampling event (4 memoranda), containing
tabulated field and laboratory chemistry data.
• Responding to requests for information (5), or questions from PBCHD and FDEP during the
12 -month sampling interval.
• Conducting a meeting (1) with the City, PBCHD, and FDEP following the field investigation to
report tentative sampling results.
• Responding to comments on the Draft Investigation Report from Palm Beach County and
FDEP.
• Negotiating with regulators from PBCHD and FDEP on final closure activities at BBLF
Should sampling turn out as expected, the crucial important element of Task 5 will involve
convincing PBCHD and FDEP that arsenic in groundwater at BBLF originates from naturally- occurring
causes, and accordingly, no active remedial measures are required,
C. Assumptions
This estimated cost is based on the following assumptions:
• The CITY will assist CH2M personnel in gaining access to drilling locations for MW -2R, MW-
3R, MW -4R and MW -8R and then the completed monitoring wells for sampling.
• CH2M personnel will conduct all field sampling activities.
• CH2M will subcontract a drilling contractor licensed in the state of Florida to drill and install
the monitoring wells.
• CH2M will subcontract a laboratory certified in the state of Florida to analyze four quarters
of sampling.
® CH2M will manage and verify validity of analytical data.
• CH2M will prepare a brief memorandum after installing the monitoring wells describing
drilling, installation, and development activities. The memorandum will include boring logs,
monitoring well construction diagrams, and development forms.
• CH2M will prepare a brief memorandum following each quarterly sampling event including a
summary table of water quality, Florida Drinking Water Standards and exceedances;
CH2M will supply an electronic copy, along with five hard copies of the draft and final to the
CITY for delivery to PBCHD;
D. Contract Reference
This Task Order shall be performed under the terms and conditions described within the Agreement
titled Hydrogeological Consulting Services, dated August 19, 2013, between the CITY of Boynton
Beach and CH2M HILL Engineers, Inc.
E. Compensation
Compensation by the CITY to the CONSULTANT will be on a time and materials basis in accordance
with the above - mentioned Agreement. The estimated compensation for the services described in this
Task Order is $ 166,834.58 as shown in Table 1. This fee includes a contingency allowance which may
be used with the approval of the CITY Public Works Director for additional costs associated with this
Task Order.
Table 4
Task
Personnel Rate Hours Total
Prepare for Drilling and
Sampling
Monitoring Well Installation
Quarterly Sampling
Data Reduction
Report Preparation
Office
86
6
$516.00
Junior Engineer
90
28
$
2,520.00
Engineer
120
40
$
4,800.00
Project Manager
138
12
$
1,656.00
Senior
Technologist
192
10
$
1,920.00
Expenses
$
709.20
Office
86
4
$
344.00
Junior Engineer
90
$
-
Engineer
120
120
$
14,400.00
Project Manager
138
16
$
2,208.00
Senior
Technologist
192
24
$
4,608.00
Expenses
$
16,527.60
Office
86
8
$
688.00
Junior Engineer
90
120
$
10,800.00
Engineer
120
120
$
14,400.00
Project Manager
138
24
$
3,312.00
Senior
Technologist
192
12
$
2,304.00
Expenses
$
32,013.80
Office
86
0
$
-
Junior Engineer
90
48
$
4,320.00
Engineer
120
8
$
960.00
Project Manager
138
16
$
2,208.00
Senior
Technologist
192
32
$
6,144.00
Expenses
$
236.80
Office
86
8
$
688.00
Junior Engineer
90
0
$
-
Engineer
120
16
$
1,920.00
Project Manager
138
16
$
2,208.00
Senior
Technologist
192
40
$
7,680.00
Expenses
$
346.00
10
Regulatory Support Office
86
8
$
688.00
Junior Engineer
90
0
$
-
Engineer
120
32
$
4,840.00
Project Manager
138
24
$
3,312.00
Senior
Technologist
192
16
$
3,072.00
Expenses
$
318.40
Subtotal 840 $ 151,667.80
Contingency 10% of Subtotal $ 15,166.78
Total $ 166,834.58
F. Schedule
CH2M will initiate the drilling and well installation activities within six weeks of receiving a Notice to
Proceed from the City. CH2M will conduct the first quarterly sampling event two weeks after
developing the monitoring wells. We will submit a memorandum to the City containing field and
laboratory chemistry results six weeks after each quarterly sampling event. CH2M will submit a
draft report to the City eight weeks following the fourth quarterly sampling event, and the final
report two weeks after receiving comments from PBCHD, FDEP, and the City.
�� Authorization
��'
G. �nunu�n�����=^�on
APPROVED BY:
CITY OF BOYNTON BEACH, FLORIDA
8y
APPROV AS TO FOR M;
NEY
Dated this , day of 2015.
SUBMITTED BY:
CH2K8 HILL Engineers, Inc.
By:
Kotus Watson, PE
Vice President, Florida Geographic K8ana8er
Dated this day of 2015.
12