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Home My WebLink About14- Task Order 4-04-14 Tetra Tech, Inc. Bozeman Landfill 2014 Activities on Vapor Intrusion Project Task Order Task Order for 2014 Activities on Vapor Intrusion Project Bozeman Landfill Bozeman, Montana April 4, 2014 CLIENT: CONSULTANT: The City of Bozeman Tetra Tech, Inc. P.O. Box 1230 851 Bridger Drive, Ste 6 Bozeman, Montana 59711-1230 Bozeman, MT 59715 Attention: Mr. Rick Hixson, PE Attention: Mr. Kirk A. Miller INTRODUCTION This Task Order outlines activities anticipated to be conducted during 2014 to continue the vapor intrusion investigation and mitigation work at the Story Mill Landfill site. The scope of some tasks initiated in 2013 have also expanded or are projected to exceed our initial estimates hence, additional budgets are requested. The Project Management, Community Relations and Database Management tasks are projected to require work well into 2014, hence, additional funds are needed to support our work going forward. Background Volatile organic compounds (VOCs) were discovered in soil gas at the south boundary of the Bozeman Landfill in 2012. Follow-up investigations have included a soil gas investigation in the Phase 3 Subdivision and air sampling of indoor, subslab, or crawlspace or outdoor locations. These samples have also been collected in four residential structures in the Bridger Creek Phase 2 Subdivision. Mitigation systems have been installed and are operating in 26 homes in the Bridger Creek Phase 3 Subdivision. SCOPE OF WORK This Modification is for the following work, which is in excess of our initial Task Order. Air Monitoring for Phase 3 Mitigation Tetra Tech has collected more air samples than originally expected during the pre-mitigation and post mitigation sampling efforts, due to the addition of two new homes constructed in the neighborhood and more oversight labor hours per home than we initially projected. In addition, costs for the reporting phase (i.e., individual homeowner letters) have been greater than we originally anticipated. Mitigation System Installation and Oversight of Contractor The original Task Order anticipated 26 homes would require mitigation systems, however, two new homes have been constructed in the neighborhood, increasing the scope of work. In addition, we have had numerous requests by homeowners to modify the traditional mitigation system. This has included moving piping and fans to less obtrusive locations in the home, adding sheetrock covers over piping runs, adding boxed in covers over vent piping, carrying piping to the highest roof line in the home, using custom colored piping or downspouts to match exterior colors and other home specific modifications. These additional items have been Task Order—April 2014 Modification Bozeman Landfill, Bozeman, Montana April 4, 2014 provided in order to maintain a satisfied homeowner that will continue to cooperate with the City, however, these additions have been requested after systems are installed. The process of getting City electrical inspectors into each home to inspect and approve the switches and power supply to the mitigation system fans has been conducted as a separate activity since it was difficult to coordinate inspector schedules with the homeowners and radon contractor during system installation. The result is longer installation times, which in turn increases Tetra Tech's observation hours. Additional thermal imaging contractor inspections have been required due to their being more radiant heat systems than anticipated and we also had several return visits when a second extraction point or additional vacuum monitoring points were determined to be necessary. Project Management, Database Management, Data Validation and Reporting The previous project management budgets have been expended as a result of project meetings, preparation for the recent public meetings and responding to homeowner questions and concerns. Additional funds are proposed to continue to provide these services through summer 2014. The additional sampling work outlined above also requires data validation and entry of the analytical data into the project database (Microsoft Access). This will in turn support generation of data tables, maps and GIS analysis as needed throughout this work plan and other phases of the project. Community Relations While this task is expected to include another public meeting sometime during spring/summer 2014, it also will include assisting the City in their dealings with bankers, realtors, appraisers and homeowners. This part of the task will entail developing graphics and materials to provide clear, simple presentations of the affects the mitigation systems have had on in-home air quality to help them move forward with lending on homes in the Bridger Creek subdivision. Compensation Estimated costs to complete the foregoing scope of services are not to exceed $159,320. A breakdown of these proposed expenditures is contained in the attached cost estimate. The services 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: �l �. yYtilJW Its: C17 aN4A ems— Its: Sr. Project Manager Date: S- Z 9 - I y Date: April 4, 2014 Page 2 of 2 ESTIMATED BUDGET MODIFICATION TO CONTRACT FOR SITE INVESTIGATION,MITIGATION AND PROJECT MANAGEMENT BOZEMAN LANDFILL BOZEMAN,MONTANA Date Submitted:4/4/2014 Air Monitoring For Phase 3 Mitigation Field Work Units Rote Cost Project Manager/Senior Hydrogeologisl,per hour 64 $150.00 $9,600.00 Assistant Project Manager/Hydrogeologisl,per hour 60 $95.00 $5,700.00 Environmental Scientist,per hour 120 $95.00 $11,400.00 Field Technician.per hour 120 $65.00 $7.800.00 Clerical 24 $55.00 $1.320.00 Subtotal $35.820.00 DIRECT COSTS Tetra Tech Vehicle Mileage,per mile 500 $0.56 $28000 Per Diem and Lodging,per person per day 10 $140.00 $1,400.00 Samplino Media and Analytical Costs 6L SUMMA Canister,certification&rental,each 40 $55.00 $2,200.00 24-hr Flow Controller,certification&rental.each 22 $20.60 $440.00 1/2-hr Flow Controller,certification&rental,each 18 $15.00 $270.00 TO-15 Analysis.each 40 $140.00 $5,600.00 Client Specific EDD.each 2 $5.00 $10.00 Duplicate Sampling T.cenification&rental,each 3 $8.00 $24.00 Sampling Disposables -Miscellaneous,each 12 $10.00 $120.00 Helium Meter,per week 2 $375.00 $750.00 Helium,estimate 1 3300.00 $300.00 Miscellaneous Shipping,estimate 2 $100.00 $200.00 Lab Sample Shipping(overnight to lab),estimate 1 $750.00 $750.00 TelraTech Subcontractor Markup(10%) $1,066.40 Subtotal $13,41040 TOTAL $49,230.40 Mitigation System Installation and Oversight of Contractor Project Manager/Senior Hydrogeologisl,per hour 80 $150.00 $12,000,00 Assistant Project Manager/Hydrogeologisl,per hour 200 $9500 $19,000,00 Field Technician,per hour 80 $65.00 $5,200.00 Administrative Personnel.per hour 4 $55.00 $220.00 Subtotal $36,420.00 Field Eouioment Vacuum meter,per day 12 $25.00 $300.00 Vehicle.mileage 2,000 $0.60 $1,200.00 Per Diem and Lodging,per person per day 16 3140.00 $2,240.00 Infrared USA Thermal Imaging contractor(per house) 8 3250.00 $2,000.00 TelraTech Subcontractor Markup(10%) $150.00 Subtotal $5,890.00 TOTAL $42,310.00 Protect Management-Database Management and Data Validation Project Manager/Senior Hydrogeologist.per hour 120 $150.00 $18,00000 Pnncipal Engineer,per hour 40 $262.00 $10,480.00 Assistant Project Manager/Hydrogeologist,per hour 16 $95.00 $1,52000 Environmental Chemist,per hour 40 $110.00 $4,40000 Database/GIS Analyst,per hour 40 $95.00 $3,800.00 Administrative Personnel,per hour 16 $55.00 $88000 Subtotal $39,08000 DIRECT COSTS Vehicle,mileage 2,000 $0.60 $1,200.00 Per Diem and Lodging,per person per day 6 $140.00 $840.00 Tetra Tech subtotal $2.040.00 TOTAL $41,120.00 Community Relations Project Manager/Senior Hydrogeologisl,per hour 60 S15000 $9,000.00 Assistant Project Manager/Hydrogeologist.per hour 40 $95.00 $3.600.00 Environmental Scientist.per hour 60 $110.00 $6,600.00 Database/GIS Analyst,per hour 60 $95.00 $5,700.00 Field Technician,per hour $65.00 $0.00 Administrative Personnel.per hour 24 $5500 $1,320.00 subtotal $26,420.00 DIRECT COSTS Photocopies.estimate 400 $0.10 $40.00 Reprographics,estimate 4 $50.00 $200.00 Subtotal $240.00 TOTAL $26,660.00 TOTAL OFALL TASKS $159,320.40 Tetra Tech