Loading...
HomeMy WebLinkAbout18- Task Order - Tetra Tech, Inc. - 2018 Groundwater and Perimeter Methane Monitoring Assessment of System Performance and Effectiveness at the Bozeman Landfill TETRA TECH TASK ORDER 2018 GROUNDWATER AND PERIMETER METHANE MONITORING ASSESSMENT OF SYSTEM PERFORMANCE AND EFFECTIVENESS BOZEMAN LANDFILL January 25, 2018 CLIENT: CONSULTANT: The City of Bozeman Tetra Tech, Inc. P.O. Box 1230 851 Bridger Drive, Ste 6 Bozeman, Montana 5971 1-1 230 Bozeman, MT 59718 Attention: Mr. Rick Hixson Attention: Mr. Kirk A. Miller INTRODUCTION The purpose of this task order is the following: ■ Conduct semi-annual groundwater monitoring and monthly perimeter methane monitoring at the Bozeman Landfill through 2018 per DEQ Solid Waste requirements. ■ Conduct detailed evaluations of the performance of the remediation systems and their effect upon groundwater remediation per DEQ's June 6, 2014 letter requiring the City of Bozeman to conduct a Corrective Measures Assessment and implement remedial measures. The purpose of the semi-annual groundwater monitoring and monthly perimeter methane monitoring activities is to maintain regulatory compliance associated with the original closure of the Class II landfill. The monitoring would be conducted as in previous monitoring events. The purpose of the evaluation of the remediation system would be to document performance and effectiveness and progress towards meeting groundwater and soil gas remediation goals. The remediation system is comprised of the expanded landfill gas (LFG) collection system, the soil vapor extraction (SVE) system, and the air injection (Al) system. All of these systems would be evaluated. Two groundwater monitoring events will be conducted on a quarterly basis (March and September 2018) to supplement the June and December monitoring events conducted for compliance with landfill closure requirements. 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. 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 park property adjacent to the landfill property. I Tetra Tech 851 Bridger Drive, Suite 6; Bozeman, MT 59715 Tel 406.582.8780 Fax 406.582.8790 tetratech.com I Task Order—2018 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana January 25, 2018 SCOPE OF SERVICES This task order includes the following work activities: Continue monthly perimeter methane monitoring through December 2018 • Conduct two assessment and semi-annual groundwater monitoring events in June and December 2018 (per Montana Dept. of Environmental Quality (DEQ) Solid Waste Bureau requirements) • Conduct two additional quarterly groundwater monitoring events in March and September 2018 • Conduct project management, prepare two reports of monitoring activities (including statistical analysis, and prepare one report of assessment of system performance and effectiveness. The work activities are separated into the following tasks: Task 1. Perimeter Methane Monitoring Task 1 includes 12 months (from January to December 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. Task 2 Quarterly Monitoring Events- March and September 2018 Two quarterly groundwater monitoring events are included in this task order. These will be conducted in March and September 2018. This data will contribute to the continued assessment of the 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. Justification to sample these wells is detailed in the table below. Well Justification in the Quarterly Sampling 2018 Monitoring and Assessment Bozeman Landfill Well liustification Monitoring locations downgradient of Unlined Cell or at south boundary of Bozeman Landfill MW-12 Immediately downgradient 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 downgradient of the unlined waste cell Monitoring locations in Bridger Creek Phase III neighborhood LF-2 Well in the neighborhood downgradient of Unlined Cell LF-3 Well in the neighborhood downgradient of Unlined Cell MW-20 Well with the exceedances to regulatory standards outside of the landfill property and downgradient of the Unlined Cell Page 2 of 6 TETRA TECH Task Order—2018 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana January 25, 2018 The wells will be purged prior to sampling, have field parameters measured (including temperature, pH, specific conductivity, dissolved oxygen, and oxidation reduction potential), and have samples collected for volatile organic compounds (VOCs in accordance with Method 8260 low level). Two quality assurance/quality control (QA/QC) samples will be collected and prepared during this monitoring event. These will be 1) a duplicate sample collected at a monitoring site and submitted for VOCs in accordance with Method 8260 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 3. June 2018 Groundwater Monitoring A groundwater monitoring event will be conducted in June 2018 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 2018 monitoring event is presented in Table 1. Field parameter monitoring and collection of water samples will be conducted in 26 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 one dedicated pump is included in this monitoring event, in the event of failure of a dedicated pump. 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. Five quality assurance/quality control (QA/QC) samples will be collected and prepared during the June 2018 assessment monitoring event. These will be 1) three duplicate samples collected at selected monitoring sites and submitted for analysis of all constituents included in Table 1; 2) two trip blanks 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; and 3) one decontamination blank collected from decontaminated, non-dedicated sampling equipment. Task 4. December 2018 Groundwater Monitoring The second assessment groundwater monitoring event contained in this task order will be conducted in December 2018 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 2018 monitoring event but will have additional analyses for metals, cations, and nitrogen. A monitoring, sampling, and analysis matrix for the December 2018 monitoring event is presented in Table 2. Page 3 of 6 TETRA TECH Task Order—2018 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana January 25, 2018 Field parameter monitoring and collection of water samples will be conducted in 24 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. 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. Five quality assurance/quality control (QA/QC) samples will be collected and prepared during the December 2018 assessment monitoring event. These will be 1) three duplicate samples collected at selected monitoring sites and submitted for analysis of all constituents included in Table 2; 2) two trip blanks 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; and 3) one decontamination blank collected from decontaminated, non-dedicated sampling equipment. Task 5 Project Management, Statistical Analysis and Reporting Project management will include progress reporting, scheduling of personnel, preparation/calibration of monitoring equipment/meters, supplies procurement, and other related activities; communication with City of Bozeman and DEQ; data management; administration/ invoicing; and task order preparation for 2019 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 for each of the June and December 2018 groundwater monitoring events. A statistical analysis of analytical constituents exceeding the groundwater protection or regulatory standards will be conducted in each of these groundwater monitoring events. The statistical analysis has been and will continue to be conducted in accordance with DEQ requirements (ARM 17.50.1305 (7-11)). In addition, a second remediation evaluation report will be prepared evaluating 2018 system data. As in the first report, the second remediation evaluation report will assess the expanded landfill gas (LFG) collection system, the soil vapor extraction (SVE) system, and the air injection (Al) system. The March and September 2018 groundwater monitoring results will be included along with interpretations of the data, conclusions, and recommendations for further investigation and/or monitoring. This report will be submitted is scheduled to be submitted to City of Bozeman in early 2019 and then to DEQ, following City of Bozeman approval. Page 4 of 6 TETRA TECH Task Order—2018 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana January 25, 2018 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 Start to Finish of Methane Perimeter Monitoring January 1 to December 31, 2018 March 2018 Groundwater Monitoring March 31, 2018 June 2018 Groundwater Monitoring June 30, 2018 September 2018 Groundwater Monitoring September 30, 2018 June 2018 Groundwater Monitoring Report September 30, 2018 September 2018 Groundwater Monitoring September 30, 2018 December 2018 Groundwater Monitoring December 31, 2018 2018 Remediation System Evaluation Report January 31, 2019 December 2018 Groundwater Monitoring Report March 31, 2019 COSTS Estimated costs to complete the foregoing scope of services are in shown below: Estimated Costs 2018 Monitoring and Assessment Bozeman Landfill Task Description Estimated Cost Task 1. Perimeter Methane Monitoring $5,452 Task 2. Quarterly Monitoring Events-March and September 2018 $9,135 Task 3. June 2018 Groundwater Monitoring $17,235 __ ---- -_-_-- ---__ Task 4. December 2018 Groundwater Monitoring $20,933 Task 5. Project Management, Statistical Analysis, and Reporting $38,515 Total $91,270 The services conducted and invoicing will be on a time and materials basis. A detailed cost estimate can be provided upon request. 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. Page 5 of 6 TETRA TECH Task Order—2018 Monitoring and Assessment Bozeman Landfill, Bozeman, Montana January 25, 2018 CLIENT: CONSULTANT: Citv of Bo e6n Tetra Tech By. BY Cv. �wq Printed Name: XVL yaSuy-r `�1 Printed Name: Kirk A. Miller Its: lJ Its: Senior Project Manager Date: 10 Date: January 25, 2018 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 S of 6 TETRA TECH