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Home My WebLink About15- Groundwater and Landfill Gas Monitoring Task Order L S TETRA TECH n',. TASK ORDER 2016 GROUNDWATER AND LANDFILL GAS MONITORING BOZEMAN LANDFILL November 17, 2015 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 Attention: Mr. Kirk A. Miller INTRODUCTION The purpose of this task order is to allow Tetra Tech to continue semi-annual groundwater monitoring and monthly landfill gas (LFG) monitoring at the Bozeman Landfill through 2016. This task order also includes monitoring the LFG extraction system to insure optimal operation through 2016. The purpose of the monitoring activities is to maintain regulatory compliance. 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 property but outside the landfill property. SCOPE OF SERVICES This task order includes the following work activities: ▪ Conduct two assessment groundwater monitoring events in June and December 2016 ▪ Continue oversight of landfill gas (LFG) extraction system operation between January and May 2016 ▪ Project management, June and December 2016 monitoring reports/ statistical analysis preparation The work activities are separated into the following tasks: Tetra Tech 1114 9. Ea E i,�«s�r=t C�3 r,-�-. �u�te (,; (',nzew��i. ?.l I , �t Tel 406.582.8780 Fax 406.582.8790 tetratech.coi [(f Task Order--2016 Groundwater and Landfill Gas Monitoring Bozeman Landfill, Bozeman, Montana November 17, 2015 Task 1. Landfill Gas Monitoring Task 1 includes five months of landfill gas (LFG) monitoring activities (from January to end of May 2016). By end of May 2016, it is expected that a new LFG thermal destruction system will be installed and operational. Therefore, routine monitoring may be expanded. LFG will be monitored at a number of locations for a variety of parameters, in part due to DEQ's required methane monitoring of the landfill and maintaining operation of the LFG extraction system in the landfill's unlined cell. Hence, several subtasks are proposed. Subtask 1-1 Monthly Perimeter Methane Monitoring Methane monitoring will be continued in landfill perimeter methane monitoring wells (designated BLG- wells) on a monthly schedule. Gas in these wells will be monitored for methane, carbon dioxide and oxygen (with remaining balance as nitrogen) in percent by volume using a LFG meter. Monitoring results will be entered into a database and forwarded to DEQ - Solid Waste Bureau and City of Bozeman, following each monitoring event. Subtask 1-2 Landfill Gas Extraction System Monitoring -- Flare and Well Field Monitoring To evaluate and maintain optimal operation, the LFG extraction system and flare will be monitored each month. This will likely necessitate weekly site visits to monitor and adjust operation and re- start the flare. The City of Bozeman's gas analyzer meter will be used to measure concentrations of methane, carbon dioxide, oxygen, nitrogen, and other gas parameters at the flare and in individual LEG extraction wells (labeled GW-wells) in the Unlined Cell. In addition, liquid levels will be monitored on a monthly basis in the 4,000 gallon condensate storage tank. Tetra Tech Solid Waste Remediation Specialists will review monitoring data and provide oversight/recommendations for maintaining optimal system operation. Tetra Tech personnel will conduct adjustments to the flare and individual LFG extraction wells, as necessary to maintain optimal operation. Subtask 1-3 Landfill Gas Extraction System Monitoring —Gas Sampling at Flare There will be two sampling events where a LFG sample will be collected at the flare station. These will occur during June and December 2016 to maintain compliance with the Bozeman Landfill's Air Quality Permit. In each monitoring event, LFG at the flare (before thermal destruction), will be sampled using a six liter SUMMA canister from an access port located between the blower and flare. A dedicated half-hour flow controller will be connected to the canister and access port. Each sample will be submitted to Eurofins Air Toxics, in California, for laboratory analysis of parameters listed in Table 1 of Air Quality Permit # 2951-00 (not included in this task order). Upon receiving the landfill gas analytical results, Tetra Tech will forward a copy of the lab report to the City of Bozeman and DEQ -Air and Waste Management Bureau. Page 2 of 5 TETRA TECH Task Order 2016 Groundwater and Landfill Gas Monitoring Bozeman Landfill, Bozeman, Montana November 17, 2015 Task 2. June 2016 Groundwater Monitoring An assessment groundwater monitoring event will be conducted in June 2016 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 2016 monitoring event is presented in Table 1. Field parameter monitoring and collection of water samples will be conducted in 33 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 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 a dedicated pump for one of the wells is included, in the event of a failure of one of the existing pumps. 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 2016 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. Task 3. December 2016 Groundwater Monitoring The second assessment groundwater monitoring event contained in this task order will be conducted in December 2016 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 2016 monitoring event with the exception of additional analyses for metals, anions, and nitrogen. A monitoring, sampling, and analysis matrix for the December 2016 monitoring event is presented in Table 2. Field parameter monitoring and collection of water samples will be conducted in 33 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. iF Page 3 of 5 TETRA TECH Task Order—2016 Groundwater and Landfill Gas Monitoring Bozeman Landfill, Bozeman, Montana November 17, 2015 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 1, 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 2016 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 4 Project Management, Statistical Analysis, and Reporting Project management will include, scheduling of personnel, monitoring equipment/meters, and activities; communication with City of Bozeman and DEQ; data management; administration/invoicing; and task order preparation for 2017 monitoring activities. Following the completion of each groundwater monitoring event and receipt of laboratory results, DEQ will also be notified, in a letter, as to which monitoring stations have regulatory exceedances of VOCs, metals, and/or inorganic constituents. Monitoring data will be entered into the project database and a report will be prepared summarizing results of each monitoring event. A statistical analysis of analytical constituents exceeding the groundwater protection or regulatory standards will be conducted for each groundwater monitoring event (two events - June and December 2016). The statistical analysis will be conducted in accordance with DEQ requirements (ARM 17.50.1305 (7-11)). The report will also contain interpretations of the data. Conclusions and recommendations for further investigation and/or monitoring will be included. PERIOD OF PERFORMANCE Tetra Tech's anticipated schedule to complete the above described activities will be the following: Deliverable Completion Date Start to Finish of LFG Monitoring (in this task order) January 1 to May 31, 2016 June 2016 Groundwater Monitoring June 30, 2016 June 2016 Groundwater Monitoring Report September 30, 2016 December 2015 Groundwater Monitoring December 31, 2016 December 2015 Groundwater Monitoring Report May 31, 2016 Page 4 of 5 TETRA TECH Task Order--2016 Groundwater and Landfill Gas Monitoring Bozeman Landfill, Bozeman, Montana November 17, 2015 COSTS Estimated costs to complete the foregoing scope of services are in shown below: Estimated Costs 2016 Groundwater and Landfill Gas Monitoring Bozeman Landfill Task Description Estimated Cost Task 1 Landfill Gas Monitoring $22,514 Task 2 June 2016 Groundwater Monitoring $13,428 Task 3 December 2016 Groundwater Monitoring $17,645 Task 4 Reporting, Statistical Analysis, and Project Management $27,590 Total $81,177 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. CLIENT: CONSULTANT: City of Bozeman Tetra e h By: By: Printed Name: � 1(.�.J��S it c- r�S Printed Name: Kirk A. Miller Its: ,crey✓ 1 t .�t�,. g 42„C Its: Senior Project Manager Date: { -y — '6 U Date: November 17, 2015 NOTICE OF CONFIDENTIALITY This Task Order(including ettecfencets) contains iriforrnatiori confidential to Tel's Tear_ Inc__ its subsidiaries_ and subcontractors_ it is intended only for City of Bozeman to consider Tetra Tech providiie profession-al services at the Bozeman Landfill_ Arty other use is prohibited without the prier written cortseril of Terra Tech Page 5 of 5 TETRA TECH _ AAAA m TABLE 1 .. June 2016 Monitoring Event-Schedule of Field Measurements and Laboratory Analysis Bozeman Landfill,Bozeman Montana June Well or Existing DEQ a Sampling Monitoring Frequency Approved Change r , Site '• " Metals Sulfate Total (below TOO ment (dissolved) Chloride Hardness NO2+NO3 — LF-2 Semi-annual monitoring LF-3 Semi-annual monitoring k'"� MW-3 No mon.requirement. Last event in 200 No further nienildr;ng MW-4 Semi-annual monitoring `" 11.3 MW-5* Semi-annual monitoring : , MW-6' Semi-annual monitoring - 216 56.0 MW-68 Four monitoring events completed ei-Annua`l Mon.offer June 2015 MW-7A Semi-annual monitoring . ":' , MW-7B DEQ requested next monitoring in 2015 Bi-Annual Mon,after June 2015 L MW-6A* Send-annual monitoring — MW-813 DEQ requested next monitoring in 2015 Bi-Annual Mon.after Juno 2015 46.2 70.0 MW-SC Four monitoring events completed Bl-Annuil Mus.after June 2015 MW-9A Semi-annual monitoring MW-9B DEQ requested next monitoring in 2015 Bi-Annuallrn''nflerJune2015 MW-10 Semi-annual monitoring MW-11 Semi-annual monitoring MW-12 Semi-annual monitoring 55.5 65.8 MW-13 Semi-annual monitoring MW-14 Annual mon conducted Dec2014 • Noturther monitoring MW-15' Semi-annual monitoring MW-16 Four monitoring events completed No further monitoring MW-17 Four monitoring events completed Continue monitoring in June and December MW-18 Four monitoring events completed Continue monitoring in June and December MW-19 Four monitoring events completed Continue monitoring in June and December MW-20 Four monitoring events completed Continue monitoring in June and December MW-21 Four monitoring events completed Annual Mon.(December 2015) 9.8 160 1 MW-22 Four monitoring events completed • Annual Men.(December 2015) MW-23 Four monitoring events completed Annual Mon.(December2015) , - MW-24 Four monitoring events completed Continue monitoring in June and December75.7 , MW-25 Four monitoring events completed BFAnhual Mon.(December20161 MW 26 Four monitoring events completed Bt-Annual Mon.(December20/6) MW-27 Semi-annual monitoring Continue monitoring in June and December Shop/Office Well Semi-annual monitoring - - - Bl-Annual Mon.(December 201E9- Moilhettan Seep Semi-annual monitoring Valley View Vet Well Semi-annual monitoring Field Duplicate Semi-annual monitoring Trip Blank Semi-annual monitoring Notes: VOCs:Volatile organic compounds Valley View Vet Well will have total recoverable analysis of metals Depth to groundwater and total depth are measurements 'Wells that will not be sampled or on a reducedscheiiule below ground surface . 'Full List: Analysis of 15 metals(reported as dissolved concentrations)including: 1v1W3 depth to groundwater and total depth are measurements arsenic chromium iron selenium vanadium below ground surface barium cobalt lead silver zinc •:Point orcomp]laneeWe€1 cadmium copper nickel thallium manganese AAAA ....._ ..............._.............�..._...._...,. ._... . ._ ... _ _ _. _.� .. __.._ - I Total Number of Samples I .�.33� w 251 231 01._ 0^ 0 0 '[6 File:Tables 1 2 2016 GW Mon Schedule Tetra Tech TABLE 2 December 2016 Monitoring Event-Schedule of Field Measurements and Laboratory Analysis Bozeman Landfill,Bozeman Montana December Existing DEQ Approximate Total Water Field VOCs WSampling e lin Monitoring Frequency Approved Change Depth to Depth of Level pH,SC, 'Full List' Cations Anions TDS& N as P g Site Groundwater Well Measure- DO&DRi' Metals Sulfate Total {below roc) ment (dissolved) Chloride Hardness NO2+NO3 LF-2 Semi-annual monitoring 14,3 19.6 1 1 1 1 LF-3 Semi-annual monitoring 14.2 37.5 1 1 1 - 1 1 1 MW-3 No mon.requirement. Last event in 2001 49.0 . 75.0 MW-4 Semi-annual monitoring 20.7 33.o 1 1 1 1 1 1 MW-5* Semi-annual monitoring 113.6 160.0 1 1 1 1 1 '1 MW-6' Semi-annual monitoring 31.6 55.0 1 1 1 1 1 1 MW-68 Four monitoring events completed 51-Annual Mon.(June 2017) 19.5 sac 1 MW-7A Semi-annual monitoring 57.0 65.5 1 1 1 1 MW-78 DEQ requests next monitoring in 2015 .Bl-Annual Mon.(June 2017) 57.1 .75.0 •1 • MW-8A` Semi-annual monitoring 48.9 56.0 1 1 1 1 1 1 MW-BB DEQ requests next monitoring in 2015 Bi.Annual Mon.(June 2017) 48.2 70.0 .1 MW-8C Four monitoring events completed 191-Annual Mon.(.lune 2017) 43.5 102.5 1 MW-9A Semi-annual monitoring 28a 39.0 1 1 1 1 1 1 MW-9B DEQ requests next monitoring in 2015 2i4innuai Mon.(June 2017) 28.6 54,0 1 MW-10 Semi-annual monitoring 2.3 14.5 1 1 1 1 - MW-11 Semi-annual monitoring 51.9 70.0 1 1 1 1 MW-12 Semi-annual monitoring mm 56.5 65.8 1 1 1 1 1 1 - MW-13 Semi-annual monitoring 43.8 61.3 1 1 1 1 1 1 MW-14 Annual mon conducted Dec2014 No further monitoring 33.3 465 e 1 MW 15" Semi-annual monitoring 48.8 72.5 1 1 1 1 1 1 MW-16 Four monitoring events completer!. 26.2 40.0 1 _ MW-17 Four monitoring events completed Continue monitoring in June and December 76.5 05.0 1 1 1 1 1 MW-18 Four monitoring events completed Continue monitoring in June and December 48,0 59,1 1 1 1 1 1 MW-19 Four monitoring events completed Continue monitoring in June and December 22.2 30.5 1 1 1 MW-20 Four monitoring events completed Continue monitoring in June and December 542 es,o 1 1 1 1 1 MW-21 . Four monitoring events completed . Annual Mon:(December 2015) 9.3 :. .15.0 1 1 1 MW-22 Four monitoring events completed Annual Man:(December 2015) 4.5 175 < 1. 1. ''- 1 MW 23 Fourmonitoring events completed ,Annual Mon.-(Deaenber2015) ---6.2 16.0 -1 1 1 • MW-24 Four monitoring events completed Continue monitoring in June and December 75.7 80,5 1 1 1 - MW-25 Four monitoring events completed , BI-Annual MOM(June 2017) 58:7 635 1 MW-26 Four monitoring events completed 61-Annual Mon.(June 2017) 15.0 33.0 ' 1 MW-27 Semi-annual monitoring 16.6 27.0 1 1 1 1 1 1 Shop/Office Well Semi-annual monitoring 6'-AnnuaiMon.(June 2017) _ Mollhattan Seep Semi-annual monitoring 1 1 1 1 1 Valley View Vet Well Semi-annual monitoring 1 1 1 1 Field Duplicate Semi-annual monitoring 1 1 1 Trip Blank Semi-annual monitoring 1 Notes: VOCs:Volatile organic compounds Valley View Vet Well will have total recoverable analysis of metals Depth to groundwater and total depth are measurements Wells that will not be sampled or on a reduced schedule below ground surface 'Full List': Analysis of 15 metals(reported as dissolved concentrations)including: MW-3 depth to groundwater and total depth are arsenic chromium iron selenium vanadium measurements below ground surface barium cobalt lead silver zinc •:paint of Compliance Well Cadmium copper nickel thallium manganese Total Number of Samples 33 24I 261 16 0 131 01 161 File:Tables 1 2 2016 GW Mon Schedule Tetra Tech