HomeMy WebLinkAboutAmendment to Professional Services Agreement with Tetra Tech for Landfill Gas Extraction System and Monitoring.pdf1
Commission Memorandum
REPORT TO: Honorable Mayor and City Commission
FROM: Dustin Johnson, Project Engineer
Debbie Arkell, Director of Public Services
SUBJECT: Amendment to Professional Services Agreement with Tetra Tech Inc. for
Landfill Gas Extraction System Optimization and Environmental Monitoring
Activities
MEETING DATE: June 6, 2011
AGENDA ITEM TYPE: Consent
RECOMMENDATION: Authorize City Manager to sign
BACKGROUND: The City of Bozeman has been required by the Montana Department of
Environmental Quality (DEQ) to sample and monitor the environmental effects of the Story Mill
Landfill since 1994. Tetra Tech (previously Maxim Technologies) has been contracted with the City to
assist in the work from the beginning. The nature of the contract has been to assist the City of
Bozeman in sampling, maintaining, and monitoring post closure parameters at the Story Mill Landfill
to keep the landfill in compliance with State and Federal regulations.
This proposed task order can be broken down into the following sub-tasks and costs:
· Task 1A – Upgrade and conduct maintenance of Landfill Gas Extraction (LGE) Wellheads -
$7,500. The unlined closed cell at the Story Mill Landfill has a gas extraction system to help
mitigate methane and other toxins from leaching into the ground. There are various extraction
wells that pull the toxins out of the landfill cell before they are flared off. This task order is to
repair and recalibrate wells that are in need of maintenance.
· Task 2 – Preliminary Vapor Intrusion Evaluation - $6,457. The DEQ has recently published
the Montana Vapor Intrusion Guide. The DEQ has put an emphasis on protecting overlying
structures from vapors that may be emitted from contaminants in the soils or groundwater.
This task order is for Tetra Tech to draft a plan on how the Story Mill Landfill complies with
DEQ’s regulations regarding vapor intrusion. The task order also includes a gas analysis of
some existing gas probes that are located on the landfill property.
· Task 3 – Monitoring Well Installation and Additional Monitoring - $4,325. The DEQ has
requested a new monitoring well be installed on the landfill property. The City of Bozeman
samples ground water in and around the landfill twice a year. The DEQ has requested an
additional well be installed because of the detection of contaminants in some of the up-gradient
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wells at the landfill. The new well will help better understand the extent of on any potential
contaminants contained within the landfill property. The task order is for the drilling of the
new well.
UNRESOLVED ISSUES: None.
ALTERNATIVES: As suggested by the City Commission.
FISCAL EFFECTS: With the project management, reporting, and data analysis, the total cost of this
task order is $22,334. The entire project will be funded through the Solid Waste
Landfill Closure/Post-Closure Fund. This fund is required by the DEQ to be
maintained to ensure there are adequate funds for closure/post-closure activities
required at landfills. There is currently $ 1,663,151.72 in this fund.
Attachments: Tetra Tech Task Order/Proposal
Report compiled on: May 26, 2011
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TASK ORDER / PROPOSAL
LANDFILL GAS EXTRACTION SYSTEM OPTIMIZATION
AND ENVIRONMENTAL MONITORING ACTIVITIES
BOZEMAN SANITARY LANDFILL
May 23, 2011
CLIENT: CONSULTANT:
The City of Bozeman Tetra Tech, Inc.
P.O. Box 1230 851 Bridger Drive, Ste 6
Bozeman, Montana 59711-1230 Helena, MT 59715
Attention: Mr. Dustin Johnson Attention: Mr. Mark F. Pearson
This task order/proposal, Landfill Gas Extraction (LGE) System Optimization and Environmental
Monitoring Activities is presented to the City of Bozeman in response to a meeting between Tetra
Tech and City of Bozeman Landfill representatives on April 25, 2011. In this meeting, City of
Bozeman Landfill representatives requested that a task order/proposal for maintenance and
optimization of the LGE system and other monitoring activities be provided. This task
order/proposal is comprised of the following activities:
SCOPE OF SERVICES:
TASK 1A UPGRADE AND CONDUCT MAINTENANCE OF LGE WELLHEADS
Task 1A consists of upgrading hard piping between LGE wellheads and valve manifolds in the
remaining LGE wells listed. This will include 11 LGE wells: GW-1 through -6, -8, -9, -11, -14, and -
15). In addition, Williams will also shorten the flexible piping at LGE wells GW-7, -10, -12, and -13.
The LGE system is 13 years old and has been operating continuously, for the most part. In
addition to controlling migration of landfill gas and methane, the system is an effective
groundwater remediation technology for the landfill. It is Tetra Tech’s recommendation that
various monitoring and maintenance activities are conducted to optimize system performance and
allow for long term operation.
In late 2010, ground settling of the unlined closed cell had resulted in the breakage of piping
between several LGE wellheads and valve manifold/collector piping. Examination of the settling
indicated that 12 LGE wells on the top of the Unlined Closed Cell were most vulnerable to piping
breaks due to the greatest amount of vertical ground movement from settling. In January 2011,
Williams Plumbing (subcontractor to Tetra Tech) repaired the broken piping with flexible piping on
four of the LGE wells (LGE wells GW-7, -10, -12, and -13). Four wells were upgraded due to only
four having broken piping and a desire to test the operational capability of the flexible piping.
Observations since installation indicate the feasibility of using flexible piping but that it needs to be
shortened to prevent sagging.
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Task Order/Proposal Page 2 of 5
Landfill Gas Extraction System Optimization
and Environmental Monitoring Activities
Bozeman Landfill
TASK 2 PRELIMINARY VAPOR INTRUSION EVALUATION
Task 2 – Preliminary Vapor Intrusion (VI) Evaluation consists of assessing the potential for soil gas
to contain volatile organic compounds near the south boundary of the landfill and potential for
migration of soil gas into nearby subgrade spaces. The Department of Environmental Quality
(DEQ) recently published Montana Vapor Intrusion Guide and this can be found on DEQ’s
website. As quoted in the guide, “Vapor intrusion refers to the process by which volatile chemicals
migrate from subsurface contaminant sources such as contaminated soils or groundwater, to the
soil vapor phase, and into the indoor air of existing or future nearby or overlying structures. In the
case of the Bozeman Landfill and adjacent residential area, investigation and monitoring activities
conducted to date have not indicated VI into nearby subgrade spaces. However, the City of
Bozeman wishes to conduct a preliminary evaluation of the potential for VI at the site. Therefore,
monitoring of soil gas in existing soil gas monitoring probes along the south boundary of the landfill
will be conducted. Specifically, Task 2 – Preliminary Vapor Intrusion Evaluation is comprised of
the following activities (Subtasks):
SUBTASK 2A DEVELOP APPROACH TO EVALUATION OF VAPOR INTRUSION
POTENTIAL
Tetra Tech personnel have reviewed site data to develop an approach to evaluating VI potential at
the site in a preliminary yet effective manner. This approach was further complemented by
cursory review of VI studies undertaken at the Bozeman Solvent Site and Burlington Northern
Livingston Site and discussions with DEQ case managers of these projects. The recently
published DEQ Montana Vapor Intrusion Guide was also reviewed.
SUBTASK 2B COLLECTION AND ANALYSIS OF GAS SAMPLES FROM PROBES BLG-3, -
4, -5, AND -10
Soil gas will be collected from existing soil gas monitoring probes BLG-3, -4, -5, and -10 along the
south boundary of the landfill. Gas samples will be collected using an air sampling pump filling
Tedlar® bags at each probe. The samples will be shipped Fed Ex overnight to AtmAA, Inc., in
Calabasas, California for analysis of VOCs in accordance with EPA Method TO-15 Selective Ion
Mode (SIM). The analytical method will be modified for analysis of gas from a Tedlar bag with an
effort made to attain analytical detection limits corresponding with EPA Regional Screening Levels
for individual VOC parameters detected in ‘Indoor Air’.
The analytical results will provide information as to the number of VOC constituents and their
concentration range occurring in soil gas and the east-west extent of these VOCs adjacent to the
landfill. The existing probes are screened generally between 5 and 25 feet bgs, so these locations
will provide average VOC concentrations across the screened interval rather than depth specific
data.
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Task Order/Proposal Page 3 of 5
Landfill Gas Extraction System Optimization
and Environmental Monitoring Activities
Bozeman Landfill
TASK 3 MONITORING WELL INSTALLATION AND ADDITIONAL MONITORING
Task 3 – Monitoring Well Installation and Additional Monitoring is in response to a written request
by the Montana Dept. of Environmental Quality (DEQ) dated April 25, 2011. DEQ requested that
additional plume characterization and delineation be conducted in response to detection of
contaminants above the groundwater protection standard (GPS) in wells MW-6, MW-7A, and MW-
8A. Furthermore, DEQ requested that a minimum of one monitoring well be installed
downgradient (with regard to groundwater flow) of well MW-6. Wells MW-6 and MW-8A are point
of compliance (POC) locations for the Bozeman Landfill. Contaminants exceeding the GPS in the
vicinity of these three wells are vinyl chloride (in well MW-6), tetrachloroethene (in MW-7A), and
nitrate+nitrite (in well MW-8A). With regard to vinyl chloride (in well MW-6) and tetrachloroethene
(in MW-7A), the installation of one monitoring well is proposed and would be located west of well
MW-6 as shown in Figure 1. This well would be sampled for volatile organic compounds (VOCs).
With regard to nitrate+nitrite (in well MW-8A), sampling downgradient well LF-2 for nitrate on a
semi-annual basis, is proposed. Specifically, Task 3 – Monitoring Well Installation and Additional
Monitoring is comprised of the following activities (Subtasks):
SUBTASK 3A MONITORING WELL INSTALLATION
This subtask pertains to the installation of one monitoring well west of well MW-6 as shown in
Figure 1. This well is anticipated to be drilled a maximum of 50 feet below ground surface (bgs)
and groundwater is anticipated to be intersected at 40 bgs at the proposed well location.
A custom utility locate may be needed to clear the drill site of any underground utilities. The
well will be drilled and installed using air rotary methods by a local drilling services company.
Tetra Tech personnel have communicated with Red Tiger Drilling in Logan, Montana with
regard to estimating the drilling and well completion costs in this work plan. Their bid is
contained in the Estimated Budget Breakdown (Attachment A). The well will be constructed of
2-inch diameter, schedule 40 PVC with 0.020-inch slots in a 15-foot screened section. In
addition to the PVC pipe, the driller will provide and install: 1) 10-20 silica sand to two feet
above top of the screened casing, 2) a bentonite seal from top of sand pack to within two feet of
ground surface, and 3) a locking, steel, stick-up well protector set in concrete grout. It is
assumed that this well will be placed off of vehicle/equipment driveways and as such, this proposal
does not include the installation of traffic barriers around the new well.
Depending on the alluvial material encountered and initial recovery in the well, well development
may consist of Tetra Tech personnel using a bailer or the driller using compressed air.
Development water will be allowed to infiltrate into soil at the drill site. Tetra Tech personnel will
conduct non-professional surveying between the new well and well MW-6 to determine elevation
above mean sea level of the top of the PVC well casing. This will be accomplished using level and
rod surveying equipment.
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Task Order/Proposal Page 4 of 5
Landfill Gas Extraction System Optimization
and Environmental Monitoring Activities
Bozeman Landfill
SUBTASK 3B GROUNDWATER MONITORING
Monitoring of the new monitoring well and well LF-2 will be conducted once and coincide with the
June 2011 monitoring event. Monitoring will be conducted in accordance with Tetra Tech’s
current groundwater monitoring sampling and analysis plan. Subsequent monitoring of these
wells is expected to be included in future task order/proposals for continued monitoring.
New Monitoring Well
After the completion of the drilling and well installation (Task 3A), A sample will be collected and
submitted to Pace Analytical Laboratories in Billings, Montana for analysis of volatile organic
compounds (VOCs) in accordance with EPA Method 8260.
Well LF-2 (Downgradient of Well MW-8A)
A sample will be collected and submitted to Pace Analytical Laboratories in Billings, Montana for
analysis of nitrate (or nitrate+nitrite).
PROJECT MANAGEMENT
Task 1 project management will consist of task order preparation for the LGE optimization, activity
scheduling and logistics, progress reporting, and preparation of as-built diagram for the O & M
Manual.
Task 2 project management will consist of task order preparation for the VI evaluation, review of
analytical results upon their receipt. A progress report will be submitted to City of Bozeman will
contain the gas analytical results, Tetra Tech’s evaluation of analytical results, recommendations
on modifying the TO-15 analyte list for future VI monitoring, and any other pertinent
recommendations.
Task 3 project management will consist of task order preparation, regulatory liaison, activity
scheduling and logistics, and incorporation of well installation information and monitoring analytical
results into the June 2011 monitoring report. The new well’s information and analytical data will be
added to the project database. The June 2011 report will also contain a groundwater contour map
that will incorporate the new well’s groundwater information.
Additional detail of the above Tasks and Subtasks are contained in the Estimated Budget in
Attachment A.
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Task Order/Proposal Page 5 of 5
Landfill Gas Extraction System Optimization
and Environmental Monitoring Activities
Bozeman Landfill
PERIOD OF PERFORMANCE: Activities covered in this task order will begin upon approval of
this task order. The subtasks and anticipated completion times are as follows:
Task or Subtask Anticipated Time of Completion
Task 1A Upgrade LGE Well Heads and conduct maintenance July 15, 2011
Subtask 2A Develop Approach to Evaluation of Vapor Intrusion Potential May 23, 2011
Subtask 2B Collection and Analysis of Gas Samples from Probes BLG-3, -4, -5, and -10 July 15, 2011
Subtask 3A Monitoring Well Installation July 15, 2011
Subtask 3B Groundwater Monitoring July 22, 2011
Completion of Reporting no later than August 26, 2011
COMPENSATION: Estimated costs to complete the foregoing scope of services are $22,334.
Attachment A details these costs. All services in this task order will be conducted on a time and
materials basis.
SPECIAL CONDITIONS: Execution of this Task Order constitutes acceptance of all terms and
conditions contained in Tetra Tech’s Professional Services Agreement with the City of Bozeman,
dated January 3, 1994 and Amendment Nos. 1, 2, 3, and 4 of the Professional Services
Agreement dated July 31, 1995; January 1, 1996; March 17, 1997; and December 10, 2001,
respectively.
CLIENT: CONSULTANT:
City of Bozeman Tetra Tech
By: By:
Its: Its:
Date: Date:
NOTICE OF CONFIDENTIALITY This Task Order (including attachments) contains information confidential to Tetra
Tech, Inc., its subsidiaries, and subcontractors. It is intended only for City of Bozeman to consider Tetra Tech
providing professional services at the Bozeman Landfill. Any other use is prohibited, without the prior written consent
of Tetra Tech.
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ChurnCreek
Shop WellStory Mill RoadShedScaleHouseMW-7BMW-12MW-13MW-8AMW-8BMW-9AMW-9BLF-3LF-2MW-10MW-4MW-6McIlhattan VeterinaryClinic/WellLandfill Property BoundaryLandfill Property BoundaryApproximately 675 feet NorthMW-3McIlhattanSeepMW-14MW-15ShopMW-11McIlhattan RoadE a s t G a l l a t i nR i v e r479047804770476047504740473047204710470046904680MW-5MW-7ANORTHTask 3 - Monitoring Well InstallationBozeman Sanitary LandfillBozmena, MontanaFIGURE 1114-710303.40054
ATTACHMENT A
ESTIMATED BUDGET BREAKDOWN
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Task 1A UPGRADE AND CONDUCT MAINTENANCE OF LGE WELLHEADS
FIELD WORK
Units Unit Cost Amount
Williams Plumbing plumber, per hour 60 $75 $4,500
Materials and Equipment, estimate per well 15 $100 $1,500
Tetra Tech Project Manager / Hydrogeologist, per hour 10 $90 $900
Tetra Tech markup of 10% (of subcontractor time and materials) $600
TASK 1A TOTAL $7,500
TASK 2 PRELIMINARY VAPOR INTRUSION EVALUATION
UBTASK 2A DEVELOP APPROACH TO EVALUATION OF VAPOR INTRUSION POTENTIAL
Units Unit Cost Amount
Sr. Scientist, Engineer, or Specialist, per hour 10 $150 $1,500
Tetra Tech Project Manager / Hydrogeologist, per hour 24 $90 $2,160
CAD Specialist, per hour 1 $75 $75
SUBTASK 2A SUBTOTAL $3,735
UBTASK 2B COLLECTION AND ANALYSIS OF GAS SAMPLES FROM PROBES BLG-3, -4, -5, AND -10
Field Activities Units Unit Cost Amount
Sampling pump, per day rental 2 $60 $120
Tedlar bag, each (two per location) 8 $20 $160
Laboratory analysis (TO-15), each 4 $350 $1,400
Sampling pump shipping, estimate 1 $70 $70
Fed Ex shipping to laboratory, estimate 1 $70 $70
Tetra Tech markup of 10% (on materials and shipping costs) $182
Tetra Tech Project Manager / Hydrogeologist, per hour 8 $90 $720
SUBTASK 2B SUBTOTAL $2,722
TASK 2 TOTAL $6,457
ATTACHMENT A
(Install flex hose on 11 LGE wells (GW-1 through -6, -8, -9, -11, -14, -15), shorten flex piping on four existing LGE
wells (GW-7, -10, -12, -13), and conduct inspection/maintenance on the remaining LGE wells)
(assume 2 personnel, 2 hours per well for flex piping installation, 1 hour per well for shortening flex piping, and 4
hours for travel and miscellaneous repair items)
May 23, 2011
BOZEMAN SANITARY LANDFILL
ESTIMATED BUDGET BREAKDOWN
TASK 1A - LANDFILL GAS EXTRACTION SYSTEM OPTIMIZATION
AND ENVIRONMENTAL MONITORING
5/23/2011 Tetra Tech Page 1 of 356
ATTACHMENT A
May 23, 2011
BOZEMAN SANITARY LANDFILL
ESTIMATED BUDGET BREAKDOWN
TASK 1A - LANDFILL GAS EXTRACTION SYSTEM OPTIMIZATION
AND ENVIRONMENTAL MONITORING
Task 3 MONITORING WELL INSTALLATION AND ADDITIONAL MONITORING
Subtask 3A MONITORING WELL INSTALLATION
Subcontractor Services and Equipment Units Unit Cost Amount
Red Tiger (Logan, Montana) Drilling and Well Installation, b 1 $2,350 $2,350
(Includes materials)
Red Tiger Well Development/Stand-by, per hour 1 $250 $250
(not anticipated but if needed)
Custom Utility Locate, estimate 1 $150 $150
Surveying level and rod, rental estimate per day 1 $30 $30
Drill Cutting Logging Materials 1 $15 $15
Labor and Markup
Tetra Tech Project Manager / Hydrogeologist, per hour 7 $90 $630
Tetra Tech markup of 10% (of subcontractor time, equipment rental, and materials) $280
SUBTASK 3A SUBTOTAL $3,705
Subtask 3B ADDITIONAL GROUNDWATER MONITORING
Subcontractor Services and Equipment Units Unit Cost Amount
Sampling Disposables (bailer, gloves, chord), each 2 $6.00 $12.00
Lab Sample Shipping (UPS overnight to lab), estimate 1 $20.00 $20.00
Lab Analysis (VOCs EPA Method 8260), each 1 $95.00 $95.00
Lab Analysis (NO2+NO3 or NO3), each 1 $25.00 $25.00
Labor and Markup
Tetra Tech Project Manager / Hydrogeologist, per hour 2 $90 $180
Tetra Tech markup of 10% (of subcontractor time and materials) $15
SUBTASK 3B SUBTOTAL $347
TASK 3 TOTAL $4,052
(Includes one monitoring event on the new well and well LF-2 to coincide with the June 2011 monitoring event at the
Bozeman Landfill. Assumes the collection of samples from each well for lab analysis)
(Supervise installation of one monitoring well to approx. 50 feet depth, use 2-inch diameter PVC, 15 feet of screened
PVC pipe, and a stick-up well protector)
5/23/2011 Tetra Tech Page 2 of 357
ATTACHMENT A
May 23, 2011
BOZEMAN SANITARY LANDFILL
ESTIMATED BUDGET BREAKDOWN
TASK 1A - LANDFILL GAS EXTRACTION SYSTEM OPTIMIZATION
AND ENVIRONMENTAL MONITORING
TASK 1A PROJECT MANAGEMENT AND REPORTING
Units Unit Cost Amount
Sr. Project Manager, per hour 1 $150 $150
Tetra Tech Project Manager / Hydrogeologist, per hour 3 $90 $270
Clerical or Administrative Assistant, per hour 1 $65 $65
SUBTOTAL $485
TASK 2 PROJECT MANAGEMENT, DATA ANALYSIS, AND REPORT PREPARATION
Units Unit Cost Amount
Sr. Scientist, Engineer, or Specialist, per hour 6 $150 $900
Tetra Tech Project Manager / Hydrogeologist, per hour 20 $90 $1,800
CAD Specialist, per hour 3 $75 $225
Clerical or Administrative Assistant, per hour 2 $65 $130
SUBTOTAL $3,055
TASK 3 PROJECT MANAGEMENT AND REPORTING
Units Unit Cost Amount
Tetra Tech Project Manager / Hydrogeologist, per hour 8 $90 $720
Clerical or Administrative Assistant, per hour 1 $65 $65
SUBTOTAL $785
PROJECT MANAGEMENT TOTAL $4,325
TOTAL OF ALL ACTIVITIES $22,334
(Includes task order preparation, regulatory liaison, activity scheduling and logisitics, database management,
progress reporting, and final reporting of Subtasks 1A through 1D)
(Includes activity scheduling and logisitics, database management, and analysis/reporting in Subtask 2B)
(Includes task order preparation, activity scheduling and logisitics, progress reporting, and preparation of as-built
diagram for the O & M Manual)
5/23/2011 Tetra Tech Page 3 of 358