HomeMy WebLinkAbout16- Task Order Modification for SVE and Air Sparge System Construction 0 TETRA TECH
Attachment A
Task Order
Modification for SVE and Air Sparge System Construction Oversight
Bozeman Landfill
Bozeman, Montana
February 8, 2016
CLIENT: CONSULTANT:
The City of Bozeman Tetra Tech, Inc.
P.O. Box 1230 303 Irene Street
Bozeman, Montana 59711-1230 Helena, MT 59601
Attention: Mr. Rick Hixson, PE Attention: Mr. Larry Cawlfield, PE
INTRODUCTION
The City of Bozeman is currently implementing the selected alternative for remediation of the
Bozeman Landfill. Tetra Tech is currently contracted to provide construction oversight and
other tasks during and after construction. Since the existing contract was completed, additional
tasks including full time oversight, environmental monitoring and purchase of equipment and
materials have been requested by the City to be added to the contract.
SCOPE OF WORK
This scope of work covers the change from Tetra Tech providing part time construction
oversight to full time construction oversight, purchase of construction materials and
environmental monitoring during construction that was not previously anticipated. Details of the
work are described in the following sections.
TASK 200 BIDDING AND CONSTRUCTION OVERSIGHT
Tetra Tech's original task order was developed prior to even the start of design of the project
and it anticipated providing staff on a part-time basis for construction oversight and it was based
upon an estimated construction time of approximately 70 days. Now we know the contract
period for CK May and work days to complete construction are closer to 114 days. Full time
oversight will not be required every day because there are planned periods when no work will
be underway. This will also require more project manager hours due to additional weekly
meetings, oversight and reporting. There also are construction activities which will require more
than one oversight person to be on site at the same time (e.g., landfill gas, auger and air rotary
drilling overlaps). During the preconstruction meeting the City requested that Tetra Tech have
staff on site on a full-time basis throughout the project. Hence, we have estimated an additional
320 hours of oversight time will be necessary.
TASK 600 PURCHASE SELECTED MATERIALS
Materials purchased for this task include approximately 680 linear feet of chlorinated PVC pipe
for use in LFG well construction and ten well head assemblies also to be used in LFG well
construction. Purchase of pipe and valve materials was necessitated during an attempt to drill
LFG wells ahead of the main construction contract. Itemized costs for these items are shown in
Table 1.
Tetra Tech
303 Irene Street; Helena, MT 59601
Tel 406.443.5210 Fax 406.449.3729 tetratech.com
ii
Task Order for Corrective Measures Assessment Design and Implementation
Bozeman Landfill Remediation
February 8,2016
Page 2 of 3
TASK 700 ENVIRONMENTAL MONITORING
Environmental monitoring consisting of measuring noise, odors, and selected gases is being
conducted during all phases of construction. Specialized equipment consisting of a weather
station and a 'Nasal Ranger' has been purchased and is being used. Other specialized
equipment consisting of a four-gas monitor, flame ionization detector, and noise measuring
smart phone applications are being used. Monitoring generally consists of measuring for the
presence of noise, odors and gases in and around the area where work is actively taking place
and, if detected there, followed by additional monitoring around the periphery of the landfill.
Frequency of measurements may vary over the course of construction depending on the
particular construction activities underway. For purposes of estimating a cost for this task, we
have estimated that approximately 3 hours of monitoring per day will occur whenever there is
excavation of any sort occurring on the project.
COMPENSATION
Estimated costs to complete tasks 600 and 700 are shown below. A breakdown of costs for these
tasks is contained in the attached cost estimate. The original task orders (100-500) for this
contract are not to exceed $288,379. With the additional $136,797 of costs for the scope of work
outlined above under Task 200 and new Tasks 600 and 700, total charges for this contract are not
to exceed $425,176. The services will be conducted on a lump sum basis as described in the April
15, 2014 Contract between the City and Tetra Tech.
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 April 15, 2014.
CLIENT: CONSULTANT:
City of Bozeman Tetra Tech
�,4 I '. .
By: By:
Its: c_ ,ly Ni Ari//a aye C Its: Project Manager
Date: 3 - )— )b Date: February 8, 2016
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.
TETRA TECH
Task Order for Corrective Measures Assessment Design and Implementation
Bozeman Landfill Remediation
February 8,2016
Page 3 of 3
TABLE 1
ESTIMATED COSTS FOR MODIFICATION OF TASK 200 AND
PROPOSED NEW TASKS 600 AND 700
TASK DESCRIPTION ESTIMATED
COST
200 Bidding and Construction Oversight
Field Labor(40 days x 8 hours per day x$105/hr) $33,600
PM Labor(9 additional weeks x 10 hrs/wk x$160/hr) $14,400
Travel (vehicle, per diem) $ 500
Subtotal $48,500
600—Purchase Selected Materials
680 LF CPVC Pipe and Fittings (+15%) $35,768
10 QED wellhead assemblies (+15%) $9,536
Subtotal $45,304
700—Environmental Monitoring
Equipment Purchase (+15%) $ 3,593
Labor(100 days x 3 hr/day x$110/hr) $33,000
Flame Ionization Meter($400/week x 16 weeks) $ 6,400
Subtotal $42,993
Total $136,797
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TETRA TECH