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HomeMy WebLinkAbout17- Task Order - Tetra Tech - 2017 Groundwater and Perimeter Methane Monitoring at Bozeman LandfillOTETRA TECH TASK ORDER 2017 GROUNDWATER AND PERIMETER METHANE MONITORING ASSESSMENT OF SYSTEM PERFORMANCE AND EFFECTIVENESS BOZEMAN LANDFILL February 28, 2017 CLIENT: CONSULTANT: The City of Bozeman Tetra Tech, Inc. P.O. Box 1230 851 Bridger Drive, Ste 6 Bozeman, Montana 59711-1230 Bozeman, MT 59718 Attention: Mr. Rick Hixson INTRODUCTION Attention: Mr. Mark F. Pearson The purpose of this task order is the following: • Continue semi-annual groundwater monitoring through 2017 • Continue monthly perimeter methane monitoring at the Bozeman Landfill through 2018. • Evaluate performance of the remediation systems and their effect upon groundwater quality. The purpose of the semi-annual groundwater monitoring and monthly perimeter methane monitoring activities is to maintain regulatory compliance. The monitoring would be conducted as in previous monitoring events. The purpose of the evaluation of the remediation systems would be to document performance and effectiveness. The expanded landfill gas (LFG) collection system, the soil vapor extraction (SVE) system, and the air injection (AI) system would be evaluated. In addition to the routine semi-annual groundwater monitoring program, two additional groundwater monitoring events are proposed for this first year (March and September 2017). This would allow groundwater quality trends to be identified sooner, thereby allowing any changes in system operation to be implemented sooner than if only two data points a year are collected. Groundwater monitoring wells were installed and a groundwater monitoring program was implemented beginning in 1981. Monitoring results have shown that groundwater quality has been impacted primarily by VOCs originating from the Bozeman Landfill's unlined waste cell. Tetra Tech 851 Bridger Drive, Suite 6; Bozeman, MT 59715 Tel 406.582.8780 Fax 406.582.8790 tetratech.com Task Order — 2017 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana February 28, 2017 Ten additional monitoring wells were installed during 2014 and increased the total number of monitoring stations to 33. Monitoring results indicate a southwesterly to westerly groundwater flow. Tetrachloroethene has exceeded regulatory standards in groundwater, on City of Bozeman property adjacent to the landfill property. SCOPE OF SERVICES This task order includes the following work activities: • Continue monthly perimeter methane monitoring through March 2018 • Conduct two assessment/semi-annual groundwater monitoring events in June and December 2017 • Conduct two additional quarterly groundwater monitoring events in March and September 2017 • Conduct project management, prepare two reports of monitoring activities, and prepare two remediation system evaluation reports. The work activities are separated into the following tasks: Task 1. Perimeter Methane Monitoring Task 1 includes 12 months (from March 2017 to 2018) of methane monitoring activities. Monitoring is conducted on a monthly basis in eight gas monitoring wells (designated BLG- wells). Gas collected in these wells will be monitored for methane, carbon dioxide and oxygen (with remaining balance as nitrogen) in percent by volume using City of Bozeman's landfill gas (LFG) analyzer. Monitoring results will be entered into a database and forwarded to City of Bozeman and DEQ - Solid Waste Bureau following each monitoring event. Two quarterly groundwater monitoring events are contained in this task order. These will be conducted in March and September 2017 to assess performance of the remediation system. Groundwater monitoring will be conducted in wells LF -2, LF -3, MW -12, MW -17, MW -18, and MW -20. In addition, one trip blank sample will be analyzed. It is anticipated that this additional monitoring task may only be necessary for 2017 to provide additional data during early operation of the SVE/AI remediation system. It is not required by DEQ, however, we feel it will allow us to better evaluate remediation system effectiveness. The need for quarterly sampling during subsequent years will be evaluated on a year by year basis. Page 2 of 6 TETRA TECH Task Order— 2017 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana February 28, 2017 These wells will be purged prior to sampling and field parameters will be measured (including temperature, pH, specific conductivity, dissolved oxygen, and oxidation reduction potential), and samples will be collected for volatile organic compounds laboratory analysis (Method 8260 low level). Task 3. June 2017 Groundwater Monitoring An assessment groundwater monitoring event will be conducted in June 2017 as part of the routine groundwater monitoring at the Bozeman Landfill. Tetra Tech will perform groundwater monitoring in accordance with Tetra Tech's Groundwater Monitoring Sampling Analysis Plan. Groundwater monitoring will be conducted in existing groundwater monitoring wells or stations. A monitoring, sampling, and analysis matrix for the June 2017 monitoring event is presented in Table 1. Field parameter monitoring and collection of water samples will be conducted in 28 monitoring sites/wells as specified in Table 1. Water levels will be measured in all monitoring wells at the site. Wells will be purged prior to sampling. Field parameters including temperature, pH, specific conductivity, dissolved oxygen, and oxidation reduction potential will be measured at all monitoring wells/stations where water samples will be collected. Field parameters will generally be measured during and at the conclusion of purging the monitoring wells. The purchase of dedicated pumps for two of the wells is included. The pump dedicated to well MW -4 failed during the November -December 2016 monitoring event and needs to be replaced. The second pump purchase is in the event of a failure of one of the existing pumps. Currently, pumps are used in wells LF -3, MW -4, MW -5, MW -6, MW -6B, and MW -8C. Water samples will be collected and shipped to Pace Analytical Laboratories (in Billings, Montana) for analysis of constituents shown in Table 1. The scope of analysis includes many of the constituents listed in Appendix I, 40 CFR Part 258 (July 1, 2008) in ARM 17.50.1306. Table 1 also reflects DEQ approved changes to the monitoring schedule of specified monitoring wells. Two quality assurance/quality control (QA/QC) samples will be collected and prepared during the June 2017 assessment monitoring event. These will be 1) a duplicate sample collected at a monitoring site and submitted for analysis of all constituents included in Table 1 and 2) a trip blank prepared by Pace Analytical Laboratories, shipped with the sample bottles, traveling with sample bottles in the field, and returned to the laboratory for analysis of VOCs. Page 3 of 6 TETRA TECH Well Justification in the Quarterly Sampling 2017 Monitoring and Assessment Bozeman Landfill Well 1justification Monitoring locations downgradient of unlined cell or at south boundary MW -12 Immediately downgradienl of unlined waste cell, would be first well to measure changes due to increased LFG extraction and leachate collection MW -17 Well that has had most Impacted groundwater MW -18 Well at the south boundary of the landfill and downgradienl of the unlined waste cell Monitoring locations in Bridger Creek Phase III neighborhood LF-2Well In the neighborhood LF-3Well In the neighborhood MW -20 Well with the exceedances to regulatory standards outside of the landfill pmpeny and downgradient of the unlined waste cell These wells will be purged prior to sampling and field parameters will be measured (including temperature, pH, specific conductivity, dissolved oxygen, and oxidation reduction potential), and samples will be collected for volatile organic compounds laboratory analysis (Method 8260 low level). Task 3. June 2017 Groundwater Monitoring An assessment groundwater monitoring event will be conducted in June 2017 as part of the routine groundwater monitoring at the Bozeman Landfill. Tetra Tech will perform groundwater monitoring in accordance with Tetra Tech's Groundwater Monitoring Sampling Analysis Plan. Groundwater monitoring will be conducted in existing groundwater monitoring wells or stations. A monitoring, sampling, and analysis matrix for the June 2017 monitoring event is presented in Table 1. Field parameter monitoring and collection of water samples will be conducted in 28 monitoring sites/wells as specified in Table 1. Water levels will be measured in all monitoring wells at the site. Wells will be purged prior to sampling. Field parameters including temperature, pH, specific conductivity, dissolved oxygen, and oxidation reduction potential will be measured at all monitoring wells/stations where water samples will be collected. Field parameters will generally be measured during and at the conclusion of purging the monitoring wells. The purchase of dedicated pumps for two of the wells is included. The pump dedicated to well MW -4 failed during the November -December 2016 monitoring event and needs to be replaced. The second pump purchase is in the event of a failure of one of the existing pumps. Currently, pumps are used in wells LF -3, MW -4, MW -5, MW -6, MW -6B, and MW -8C. Water samples will be collected and shipped to Pace Analytical Laboratories (in Billings, Montana) for analysis of constituents shown in Table 1. The scope of analysis includes many of the constituents listed in Appendix I, 40 CFR Part 258 (July 1, 2008) in ARM 17.50.1306. Table 1 also reflects DEQ approved changes to the monitoring schedule of specified monitoring wells. Two quality assurance/quality control (QA/QC) samples will be collected and prepared during the June 2017 assessment monitoring event. These will be 1) a duplicate sample collected at a monitoring site and submitted for analysis of all constituents included in Table 1 and 2) a trip blank prepared by Pace Analytical Laboratories, shipped with the sample bottles, traveling with sample bottles in the field, and returned to the laboratory for analysis of VOCs. Page 3 of 6 TETRA TECH Task Order -2017 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana February 28, 2017 Task 4. December 2017 Groundwater Monitoring The second assessment groundwater monitoring event contained in this task order will be conducted in December 2017 as part of the routine groundwater monitoring at the Bozeman Landfill. Tetra Tech will perform groundwater monitoring in accordance with Tetra Tech's Groundwater Monitoring Sampling Analysis Plan. Groundwater monitoring will be conducted in existing groundwater monitoring wells or stations. The scope of the monitoring event will be similar to the June 2017 monitoring event with the exception of additional analyses for metals, cations, and nitrogen. A monitoring, sampling, and analysis matrix for the December 2017 monitoring event is presented in Table 2. Field parameter monitoring and collection of water samples will be conducted in 26 monitoring sites/wells as specified in Table 2. Water levels will be measured in all monitoring wells at the site. Wells will be purged prior to sampling. Field parameters including temperature, pH, and specific conductivity will be measured at all monitoring wells/stations where water samples will be collected. Field parameters will generally be measured during and at the conclusion of purging the monitoring wells. The field parameters: dissolved oxygen and oxidation reduction potential will be measured if winter weather conditions are at or above freezing. Water samples will be collected and shipped to Pace Analytical Laboratories (in Billings, Montana) for analysis of constituents shown in Table 2. The scope of analysis includes many of the constituents listed in Appendix I, 40 CFR Part 258 (July 1, 2008) in ARM 17.50.1306. Table 2 also reflects DEQ approved changes to the monitoring schedule of specified monitoring wells. Two quality assurance/quality control (QA/QC) samples will be collected and prepared during the December 2017 assessment monitoring event. These will be 1) a duplicate sample collected at a monitoring site and submitted for analysis of all constituents included in Table 2 and 2) a trip blank prepared by Pace Analytical Laboratories, shipped with the sample bottles, traveling with sample bottles in the field, and returned to the laboratory for analysis of VOCs. Task 5. Project Management, Statistical Analysis, and Reporting Project management will include progress reporting, scheduling of personnel, monitoring equipment/meters/supplies, and activities; communication with City of Bozeman and DEQ; data management; administration/invoicing; and task order preparation for 2018 monitoring activities. Following the completion of each groundwater monitoring event and receipt of laboratory results, DEQ will also be notified, in a letter report, as to which monitoring stations have regulatory exceedances of VOCs, metals, and/or inorganic constituents. Groundwater monitoring data will be entered into the project database and two reports will be prepared. One report will be prepared for each of the June and December 2017 groundwater monitoring events. A statistical analysis of analytical constituents exceeding the groundwater protection or regulatory standards will be conducted for each of these groundwater monitoring events. The statistical analysis will be conducted in accordance with DEQ requirements (ARM 17.50.1305 (7-11)). In addition, there will be two reports prepared that will contain detailed evaluations of the performance and effectiveness of the remediation systems. The following systems will be assessed: the expanded landfill gas (LFG) collection system, the soil vapor extraction (SVE) system, and the air injection (AI) system. The March and September 2017 groundwater monitoring results, LFG, SVE and Al air flow and methane concentration data, and vacuum and Page 4 of 6 TETRA TECH Task Order — 2017 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana February 28, 2017 pressure measurements from gas monitoring points will be evaluated in these reports. Historic groundwater monitoring data and LFG system data will also be used as the basis for any water quality trend analysis. Each report will also contain interpretations of the data. Conclusions and recommendations for further investigation and/or monitoring will also be included in each report. PERIOD OF PERFORMANCE Assuming approval of this Task Order by March 27, 2017, Tetra Tech's anticipated schedule to complete the above described activities will be the following: Deliverable Completion Date Monthly Methane Perimeter Monitoring March, 2018 March 2017 Groundwater Monitoring March 31, 2017 June 2017 Groundwater Monitoring June 30, 2017 March 2017 System Assessment Report May 31, 2017 September 2017 Groundwater Monitoring September 30, 2017 June 2017 Groundwater Monitoring Report September 30, 2017 December 2017 Groundwater Monitoring December 31, 2017 September 2017 System Assessment Report November 30, 2017 December 2017 Groundwater Monitoring Report March 31, 2018 COSTS Estimated costs to complete the foregoing scope of services are shown below: The services conducted and invoicing will be on a time and materials basis. A detailed cost estimate can be provided upon request. Page 5 of 6 TETRA TECH Estimated Costs 2017 Monitoring and Assessment Bozeman Landfill Task Description Estimated Cost Task 1. Perimeter Methane Monitoring $4,680 Task 2. Quarterly Monitoring Events - March and September 2017 $7,916 Task 3. June 2017 Groundwater Monitoring $16,378 Task 4. December 2017 Groundwater Monitoring $18,822 Task 5. Total Project Management, Statistical Analysis, and Reporting $34,940 $82,736 The services conducted and invoicing will be on a time and materials basis. A detailed cost estimate can be provided upon request. Page 5 of 6 TETRA TECH Task Order - 2017 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana February 28, 2017 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: City of B zeman Printed Name: 1 1L W tJ13 Its:-AQ-VIQb l �llQr.�Ac,l Date: 14-1-1-1,-7 CONSULTANT: �.�IVAL.:.,r.� Printed Name: Mark F. Pearson Its: Project Hydrogeologist Date: February 28, 2017 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. Page 6 of 6 TETRA TECH File: Tables 12 2017 GW Mon Schedule Tetra Tech TABLE 1 June 2017 Monitoring Event -Schedule of Field Measurements and Laboratory Analysis Bozeman Landfill, Bozeman Montana Well or Sampling Site Existing Monitoring Frequency DEQ Approved Change Approximate Depth to or000dwatm grelcomOCI Total Depth of well June Water Field VOCs Level pH, SC, 'Full List' Cations Anions TDS & Measure- D0 & ORP Metals Sulfate Total ment (dissolved) Chloride Hardness N as NO2+NO3 LF -2 Semiannual monitoring 14.3 19.6 1 1 1 1 LF- 3 Semiannual monitoring 142 37.5 1 1 1 1 MW -3 No mon. requirement Last event in 2001 No Audi monitoring 410 r:. 750 MW -4 Semi-anxi monitoring 20.7 38.0 1 1 1 1 MW- 5" Semi-annual monitoring 113.9 160.0 1 1 1 1 MW -6" Semi-annual monitoring 31.5 56.01 1 1 1 1 MW -6B Four monitoring events completed =a -Annual Mon.(mallndunez:17) 195 is 995 1 t 1 MW(­7ASemi-annual monitoring 570 65.9 1 1 1 1 MW -7B :DEQ: requested next monitoring In 2015': Suabnual Mon (ne# In June =17) 57.1 is 150 1 1 =1 i- MW- 6A" Semiannual monitoring ads 56.0 1 1 1 1 MW -66 DEQ requested next monitoring In 2015 a -Annual Man(neath June 2017) 482 ;::700 1 1 1 MW -6C Four: monitoring events completed ':I el -Annual Mao(mand In June MM *a :1025 1 1 - 1 MW- 9A Semiannual monitoring 28.3 39.0 1 1 1 1 MW - 9B DEQ requested next monitoring In 2015.a --Annual rear. neinin June 2017) 288 -: 540 1 1 1 MW_10Semi-annual monitoring 23 14.5 1 1 1 1 MW- 11 Semi-annual monitoring 519 70.0 1 1 1 1 MW- 12 Semi-annual monitoring 56.5 65.81 1 1 1 1 MW- 13 Semi-annual monitoring 418 613 1 1 1 1 1 1 MW -14 Annual mon conducted Dec2014 NofuMermormc6ng 33s -: 46p 1 MW- 15 Semi-annual monitoring 46.9 72.5 1 1 1 1 MW -16 Four monitoring everts completed No ruder monitoring 262 ;. 4.0 1 MW­17Four monitoring events completed continue monitoring m June and December 76,5 95.0 1 1 1 MW_18Four monitoring -events completed Continue monimnng in June and December 48.0 59.1 1 1 1 MW_19Four monitoring events completed continue monhering in June and December 22.2 ns 1 1 1 MW­20Four monitoring events completed continue monitoring in June and Decambor 54.2 65.0 1 1 1 MW -21 Four monitoring events completed : Anneal Mon. near in Dedember2017) as -116.0 1 MW -22 Four monitoring events completed Annual Man(neat'n 0eaember2017) 48 is 17.0 1 MW- 23 Four: monitoring events completed >. Annual Mon. (neamDebember2ot7) 82 -16.0 1 MW -24 Four monitoring events completed continue modeling in June and December 75.7 80.5 1 1 1 Ml 25 Four monitoring events completed ;. epAnnual Me (net in December 2018) 507 :63A 1 MW -26 Four: monitoring events: completed ::8'.Annual Mon,(rrek in December 2018) 150 MW -27 Semi-annual monitoring continue man Loring in June and December 19.9 27c 1 1 1 1 Shop/Ofbct,Well Semiannual monitoring Siubidual Mon(nertin December 2018) Mclihattan Seep Semi-annual monitoring 1 1 1 1 Valley View Vet Well Semi-annual monitoring 1 1 1 Field Duplicate Semi-annual monitoring 1 1 Trip Blank Semi-annual monitoring 1 Notes: Dept to groundwater and local depth are measurements below ground surface MW -3 death to gmundKdterend total dept are measurement below ground surface -: Pdredcompliancewell VOCs: Volatile organic compounds Valley View Vet Well will have total recoverable analysis of metals Wallsthet will not be sampled or on a reduced schedule 'Full List: Analysis of 15 metals(reponed as dissolved concentrations)including: arsenic chromium iron selenium vanadium barium cobalt lead silver zinc cadmium copper nickel thallium manganese Total Number of Samples 331 261 281 01 01 0 0 161 File: Tables 12 2017 GW Mon Schedule Tetra Tech File: Tables 12 2017 GW Mon Schedule Tetra Tech TABLE 2 December 2017 Monitoring Event-Schedule of Field Measurements and Laboratory Analysis Bozeman Landfill, Bozeman Montana Well or Site Existing Monitoring Frequency DEQ Approved Change Approximate Depth to Groundwater (below TDD) Total Depth Well December Water Field VOCs Level pH, SC, 'Full List' Cations Anions Measure- DO & ORP Metals Sulfate grant (dissolved) Chloride TOS 8 N asSampling Total Hardness NO2+NO3 LF-2 Semi-annual monitoring 14.3 19.6 1 1 1 1 LF-3 Semi-annual monitoring 142 375 1 1 1 1 1 1 MW-3 No mon requirement. Last event In 2001 aso =750 MW-4 Semiannual monitoring 217 380 1 1 1 1 1 1 MW- 5 Semiannual monitoring 1119 160.01 1 1 1 1 1 1 MW-6' Semiannual monitonng 313 56.0 1 1 1 1 1 1 MW_ 6S : Four monitoring events: completed tle-Annual Mon grad in June not) 195 5:995 1 MW-7A Semiannual monitoring 57.0 65.9 1 1 1 1 MIN. 78 DEQ requests nextmondonng In 2015: fiAnnual Men. (goat in June 2017) art :':75.0 1 MW-6A' Semi-annual monitonng 45.9 56.0 1 1 1 1 1 1 MW_ 8B DEQ: requests: next monitoring In 2015 leArgual Mon. law in June 20M 4412 d700 1 MW_ SC Four monitoring events: completed e4Ahnual Mon. (read in June MM alas .1025 1 MW- 9A Semi-annual monitoring 25.3 39.0 1 1 1 1 1 1 MW-9B DEO requests next monitoring In 2015 Ill-Annual Mon.(neatln June 2017) 2416 =540 1 MW- 10 Semiannual monitoring 22 Us 1 1 1 1 MW- 11 Semiannual monitoring 51.9 70.01 1 1 1 1 MW- 12 Semi-annual monitoring 565 55.5 1 1 1 1 1 1 MW- 13 Semiannual monitoring 415 511 1 1 1 1 1 1 MW-14 a Annual men conducted Dec 2014 ` NaiaMermantonng 333 -460 1 MW- 15' Semi-annual monitoring 45.5 72s 1 1 1 1 1 1 MW-16 Four monitoring events completed 262 -aa.a 1 MW-17 Four monitoring events completed Corti merged, in June and December 76.5 55.0 1 1 1 1 1 1 MW_ 18 Four monitoring events completed continue mender, in June and December 45.0 59.1 1 1 1 1 1 MW_ 19 Four monitoring events completed continua monife, in June and December 222 soo 1 1 1 MW-20 Four monitoring events completed continue moneen, in June and December bad 553 1 1 1 1 1 MW-21 Four monitoring ievents completed Annual Mon 941 (150 1 1 !.1 MW­ 22 1 Four monitoring events' completed Mr.[ Mon. 4411 17.01 1 1 s1 MW-23 Fourmonitoring:events completed Annual Man. 62 -15.0 1 1 1 MW-24 Four monitoring events completed continue monitoring in June and December 751 a0.s 1 1 1 MW-25 Four monitoring levents 'completed :& nOd Mon. (June 2017) 50.7 -630 1 MW-26 Four monitoring events' completed ': 6I-Annua1Mon.(June2017) 150 6330 1 MW-27 Semi-annual monitoring 19.9 27.0 1 1 1 1 1 1 ShoplOKca:Well Seml-annual monitoring < 6i:Annual Mon.(Juna2017) Mcllhattan Seep Semi-annual monitoring 1 1 1 1 1 Valley View Vel Well Semi-annual monitoring 1 1 1 1 Field Duplicate Semi-annual monitoring 1 1 1 Trip Blank Semi-annual monitoring 1 Notes: Depth to groundwater and total deptn are measurements below ground surface MW-3 depth to grounmenterand total di are measurements below ground surface ': Point Dlcompl'ance Well VOCs: Volatile organiccompounds Valley View Vet Well will have total recoverable analysis of metals Weltsthafwill not be sampled or on a reduced schedule 'Full List : Analysis of 15 metals (reported as dissolved concentrations) including: arsenic chromium iron selenium vanadium barium cobalt leatl silver zinc cadmium copper nickel thallium manganese Total Number of Samples 331 241 26 16 0 1:1=0=16 File: Tables 12 2017 GW Mon Schedule Tetra Tech