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Home My WebLink About13- Task Order 2-13-13 Tetra Tech, Inc. Bozeman Sanitary Landfill for Soil Gas Investigation TASK ORDER I PROPOSAL SOIL GAS INVESTIGATION BOZEMAN SANITARY LANDFILL February 13, 2013 CLIENT: CONSULTANT: The City of Bozeman Tetra Tech, Inc, P.O. Box 1230 851Bridger Drive, Ste 6 Bozeman, Montana 59711-1230 Helena, MT 59715 Attention: Mr. Dustin Johnson Attention: Mr. Mark F. Pearson This task order/proposal, for a soil gas investigation is presented to the City of Bozeman in response to a request by Bozeman Landfill representatives during a meeting with Tetra Tech personnel on January 16, 2013. The purpose of this investigation is the following: • Assess the presence of volatile organic compounds (VOCs) in soil gas in the area of groundwater impacted with VOCs beneath a residential neighborhood south of and adjacent to the Bozeman Landfill • Provide a preliminary evaluation of the lateral and vertical distribution of VOC concentrations in soil gas, if VOCs are detected • Use the information gained in this investigation to assess the potential for gas (vapor) intrusion to occur in residential structures in the subject neighborhood The investigation is proposed to occur in public right-of-way (ROW) along streets. Saint Andrews Drive, Tumberry Court, and Caddie Court (Figure 1). A minimum of 16 soil gas probes in eight locations is proposed, SCOPE OF SERVICES: The following scope of services includes preparation for and implementation of an investigation of soil gas in a residential neighborhood immediately south of the landfill property. Soil gas probes will be installed, at two depth intervals in each of the eight proposed locations (Figure 1), using Geoprobe"D direct push drilling techniques. Samples of soil gas will be collected and submitted for analysis of VOCs. Results will be evaluated and a report prepared for City of Bozeman. The scope of services is described in detail below: Task I Development and Preparation of Task Order Approach A review of standard practice investigative methodologies has been conducted to support preparation of this task order. References include guidance publications from U.S.E.P.A,, California, and Montana. A minimum of two capable Geoprobee companies will be solicited and their bids compared for a best price. Tetra Tech Task Order/Proposal Page 2 of 5 Soil Gas Investigation, Bozeman Sanitary Landfill February 13, 2013 Task 2 Preparation for Investigation Preparation for the investigation will involve procurement of sampling equipment, utility clearance, and preparation of a site health & safety plan. Also included in Task 2 is the option to prepare a neighborhood communication document. Procurement of gas sampling equipment The procurement of gas sampling equipment will include probe tips, tubing, valves, and steel probe protectors. The probe tips, tubing, and valves will consist of materials that do not sorb Vocs. Underground utility,clearance Drilling locations will be marked at the site. The Utilities Underground Location Center (UULC) will be contacted to clear all drilling locations of underground utilities. Tetra Tech personnel will mark the field locations and then field check the clearances and communicate with UULC personnel to confirm utility clearance at each drilling location. The eight soil gas probe locations are shown in Figure 1, Preparation of Job Safety Analysis A Job Safety Analysis (JSA) will be prepared that will review the sequence of basic job steps, potential hazards, and recommended action of procedure to address potential hazards. The JSA will be communicated, reiterated, and revised (as necessary) in meetings with all field personnel at the start of each work day. Preparation of neighborhood communication plan A neighborhood communication plan would be prepared for distribution at each residence along the above mentioned streets. It is proposed that the plan be a folded 'leaflet' that will be attached to the front door of each residence in the neighborhood. This one to two page document would state that monitoring activities have been and are continuing to be conducted in the neighborhood. These activities have included the sampling of groundwater and currently, soil gas to evaluate environmental impacts from the adjacent landfill. The document would provide a brief summary of the activities that will be occurring, and provide contact information at the City of Bozeman in case of questions. Task 3 Field Investigation Plan and vertical distribution of soil gas samples As mentioned above, the approach to this soil gas investigation is to have up to eight locations where soil gas can be sampled at two specific subsurface elevations described as a 'deep' probe and a 'shallow' probe. Soil gas results from these intervals will be used to assess the occurrence of VOCs in soil gas in the neighborhood. Tetra Tech Task Order/Proposal Page 8mf5 Soil Gas Investigation, Bozeman Sanitary Landfill February 13.2O13 Sampling from two depths at each location is recommended as it will provide information on the site-specific vertical attenuation of VQC concentrations, if detected. Therefore, the field investigation would consist of installing probes at 20 and 10 feet below ground surfaoa (boa) at each location. Hovvever, in the event ofgroundwater being intercepted at. or |eaa than, 20 feet bQa, the deep probe would be installed approximately two feet above groundwater and the shm||ovv probe would be installed approximately five to eight feat above the deep probe but no shallower than five feet bg8. If groundwater is encountered at depths of less than approximately 10 feet bgm at any location, then only one probe would be installed at that location, approximately 2 feet above groundwater. Geoprobeo activities At each location, the Geopnobeo will push down to e maximum of 20 feet depth, unless groundwater is encountered at a shallower depth. The holes will be "ooned" vvhlnh means that a hollow steel tube (of approximately 2 1/4 inch diameter) will be pushed down and a auH sample collected (within the steel tube). The steel tube sections will be in four foot lengths and allow an assessment uf geologic materials and the detection ofgroundwater. Probes will be installed in a manner similar to installation of monitoring well in that there will be filter screen mahmhe| around the probe, topped by beOtnniba and hydrated bemtonite. upward, to the shallow probe interval. The shallow probe completion will be the same as the deep probe completion, followed agaiD, by bentwDite and hydrated bemt0nite to within one half foot of the sUrf@ce. The fi|bsr screened intervals around the probe will be approximately 1 foot (i.e.. G inches above and below the prmbe). Each completed soil gas probe will consist ofrelatively inert materials such that V{]Cnwill not be sorbed or produced by these materials. Each probe will consist of stainless steel implant (gas permeable tip) connected to a length ofNy|aflo~e tubing. The tubing will be terminated at the surface with a one-way po|ycarbonabentop ws[ms. The tubing and valves at the surface will be protected by a flwsh-moumt, bolt-down, steel manhole of approximately 5 inches diameter. The manhole will be secured with concrete grout, |tisanticipated that the soil gas probea, at each of the eight locations in the neighborhood, will be in the boulevard portions of the public RQVV, or between the sidewalk and the street curb. If the investigation is conducted in the winter months, it may be expected that up to two feet of snow will exist in the bou|exardo, due to the routine snow clearing of the street and aidevv@|he. it will then be necessary to clear the drilling locations of snow prior to the field investigation. Tetra Tech supervisory and monitoring activities Tetra Tech personnel will supervise the installation and initial purging of the soil gas probes and insure that all of the probes s|Nao are left clean and without impact to the boulevard. Purging of o nn/Dimnunm of three bare volumes (filter pack plus tubing) will be conducted immediately after probe installation. This will be followed by an equilibration period of at least 24 hours, before collection of soil gas samples can beconducted. Tetra Tech TmskQrder/Prapoaa| Page 4cf5 Soil Gas Investigation, Bozeman Sanitary Landfill February 13, 2O13 Sample collection and shipment to laboratory A minimum of 24 hours will pass, to allow for equilibrium cond0Vns, before the probes are re- purged and sampled. At the time of sampling, three tubing volumes will be nenuuued before filling SUMMA canisters (one per oOi| gam probe) at a mnexinmUnn flow rate of 200 milliliters per minute. The aernpUng of the probes will be accomplished in one monitoring event that could be up to two days duration. Tetra Tech personnel will sample the probes and submit the marnp|ee to an accredited analytical laboratory for analysis, One duplicate sample will be collected. Laboratory anaiVsis Laboratory analysis will consist of each sample being analyzed for VOCs in accordance with TO-15 S|M method. The component list will match what has been detected in groundvxater, include components with a |uvv EPA screening level that were detected in the first phase of analysis of soil gas in methane monitoring probes at the Bozeman Landfill (October 2012). and any daughter products. Analytical detection limits for the analytical components including ch|onofOnn, tetrach/oroethena. trich]o[oethene, and vinyl chloride will attempt to match the U.S.E.P./\. Regional Screening Leve|a /RSLaL Task 4 Project Management, Data Analysis, and Report Preparation Task 4 includes the activities uf project nmamagement, deta $na|yaia. andneportprepan@tion. Proiect management The project will be managed by Mark Pearson located in the Tetra Tech Bozeman, Montana office. Senior oversight of the project will be conducted by James Elliot in Tetra Tech`s Santa Barbara' (California office. Project management will include contracting of a Geoprobe o company, field activities scheduling, and communication with City 0f Bozeman regarding drilling proQnomo/imauea. communication with the analytical laboratory, possible communication with the public or neighborhood regarding the investigation, and review and submittal of invoicing. Data analysis and Report Preparation Data analysis will be conducted by the above Tetra Tech personnel, The objective of the data analysis will be to evaluate the occurrence ofVOCa in soil gas and assess the potential for gas intrusion. If VOCs are detected, them Tetra Tech will use a predictive modeling program: Johnson & Ettinger as another method of assessing the potential for gas (vapor) intrusion, A report will be prepared summarizing the findings of this investigation. This will include the above data analysis and exa[uationo. Conclusions and recommendations will also be includod, as appropriate, |fVOCn are detected in soil gas, then e recommendation will be made to conduct e second sampling event during the highest groundwater elevations. This would typically bein June. Tetra Tech Task Order/Proposal Page 5 of 5 Soil Gas Investigation, Bozeman Sanitary Landfill February 13,2013 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 I Development and Preparation of Task Order Approach Completed • Task 2 Preparation for Investigation Within two weeks Task 3 Field Investigation Within one month • Task 4 Project Management, Data Analysis, and Report Preparation One month after field Investigation COMPENSATION: Estimated cost to complete the foregoing scope of services for 16 soil gas probes at eight locations is $25,933. 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. Michael}"fatten, Senior Engineer Its: T I I G\rtcx C--C: Its: Date: Date: Z//Z h 3 NOME OF CONFIDENTIALITY Fasi, Omep T-Ucj� an", )t"- �s oteodoc oj),�o� to uons�Je� 7e!�a Te-�,.J',,;.x1,)'�r'J( a! Tetra Tech 1 it us CL E E � AEI/ N N vi,Aw V' c l r n Ifi r� noui�l Y III Ihuupiiipiiipull i � � ", • ,, , ill �uuii N�� , py � .� d9, � �• c � f � ( ,k / r ��i� �%�� %fir%(� '%/•� q � ��I lu�� uuuuuuuuuuuuuuuuuuuuuuuum I C 6 ` r � r uj r i pp i i � �� uuuuuuuuuuuiu uu � r I� �o ," �j�p�i��1�4riwn '�/! ��l �. ?•' nib; % uuuuuuu ✓ � /mI `"F''''s hWl' i�Jrl � /1� I /�� 'r�:, _, /„JF''r wf�� Y w r C67 ATTACHMENT A ATTACHMENT A COST ESTIMATE SOIL GAS INVESTIGATION BOZEMAN SANITARY LANDFILL BOZEMAN,MONTANA February 13,2013 Units Unit Cost Amount Task I Development and Preparation of Task Order Approach Investigative methodology review and preparation Sr.Project Manager,per hour 2 $157.00 $314.00 Tetra Tech Project Manager/Hydrogeologist,per hour 2 $88.00 $176,00 Driller solicitation Tetra Tech Project Manager I Hydrogeologist,per hour 2 $88.00 $176.00 Task Order Preparation Sr.Project Manager,per hour 1 $157.00 $157,00 Tetra Tech Project Manager/Hydrogeologist,per hour 20 $88.00 $1,760.00 TASK I TOTAL $2,58100 Task 2 Preparation for Investigation Procurement of gas sampling equipment Tetra Tech Project Manager/Hydrogeologist,per hour 4 $88-00 $352.00 Materials for gas sampling,estimate 1 $200.00 $200,00 Underground Utility and Right-of-Way clearance Tetra Tech Project Manager/Hydrogeologist,per hour 4 $88.00 $352.00 Preparation of Job Safety Analysis Tetra Tech Project Manager I Hydrogeologist,per hour 1 $88.00 $8800 Preparation of neighborhood communication plan and distribution Sr.Project Manager,per hour 1 $157,00 $157.00 Tetra Tech Project Manager I Hydrogeologist,per hour 4 $88.00 $352,00 Clerical or Administrative Assistant,per hour 1 $65,00 $65.00 Materials,estimate 1 $50.00 $50.00 TASK 2 TOTAL $1,616.00 Task 3 Field Investigation (Assuming 8 locations with two soil gas probes at each location) Site(snow)Clearing Activities Rocky Mtn Dirt Detail Quote 1 $270.00 $270.00 Geoprobe Activities (Use Enviro Probe Cost Estimate-10 locations and 20 probe installations) Project Management,Mobilization,Travel,and Per Diem 1 $745.50 $745.50 Geoprobe Operation and Materials,per location with shallow and deep 8 $489.00 $3,912.00 probes Tetra Tech markup of 10%(of subcontractor time and materials) $492.75 20%Contingency for Variables in Geoprobe Investigation $931.50 SUBTOTAL $6,351,75 Tetra Tech Revision Date:2/12/2013 Page 1 of 2 ATTACHMENT A COST ESTIMATE SOIL GAS INVESTIGATION BOZEMAN SANITARY LANDFILL BOZEMAN,MONTANA February 13,2013 Tetra Tech supervisory and monitoring activities (Assuming drilling and installation of 8 locations of 2 probes per location for a total of 16 samples) Sr.Project Manager,per hour 2 $157,00 $314,00 Tetra Tech Project Manager!Hydrogeo log ist,per hour 47 $88.00 S4,136.00 Clerical or Administrative Assistant,per hour 2 $65.00 $130,00 SUBTOTAL $4,580.00 Sample collection and shipment to laboratory 16 liter SUMMA Canister rental,each 17 $55.00 $935.00 (includes one duplicate sample) Flow Control Valve Rental 4 $15.00 $60.00 SUMMA Canister Shipping to Bozeman,estimate 1 $400.00 $400.00 Shipping to laboratory,estimate 1 $400.00 $400.00 Tetra Tech markup of 10%(of subcontractor time and materials) $179_50 SUBTOTAL $1,974.60 Laboratory analysis TO-15 analysis,each 17 $140.00 $2,380.00 (includes one duplicate sample) Tetra Tech markup of 10%(of subcontractor time and materials) $238.00 SUBTOTAL $2,618.00 TASK 3 TOTAL $15,524.25 Task 4 Project Management,Data Analysis,and Report Preparation Project management Sr.Project Manager,per hour 1 $157,00 $157.00 Tetra Tech Project Manager I Hydrogeologist,per hour 3 $88.00 $264.00 Clerical or Administrative Assistant,per hour 1 $65,00 $65.00 SUBTOTAL $486.00 Data ana,lysis.and Report Preparation (includes time to input and run Johnson&Ettinger Model) Sr. Project Manager,per hour 7 $157,00 $1,,099,00 Tetra Tech Project Manager/Hydrogeologist, per hour 45 $88,00 $3,960.00 CAD Specialist,per hour 8 $75.00 $600.00 Clerical or Administrative Assistant, per hour 1 $65.00 $65.00 SUBTOTAL $5,724,00 TASK 4 TOTAL $6,210.00 TOTAL OF ALL TASKS $25,933.25 Tetra Tech Revision Date:2/12/2013 Page 2 of 2