The URL can be used to link to this page

Home My WebLink About16- 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 ( TETRA TECH