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Home My WebLink About20101630 WVIm 2400 West Union Avenue Englewood, CO 80110 303-914-1445(Phone) WASTE MANAGEMENT 866.442-0285(Fax) Weld County Planning Department GREELEY OFFICE JUL 087nin July 1, 2010 RECEIVED Mr. Jerry Henderson Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division HMWMD-SWIM-B2 4300 Cherry Creek Drive South Denver, CO 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, CO 80631 SUBJECT: NORTH WELD LANDFILL SECOND QUARTER 2010 GAS MONITORING REPORT Dear Mr. Henderson and Mr. Swain: Enclosed for your information is the Second Quarter 2010 Gas Monitoring Report for North Weld Landfill (NWLF). The report dated June 15, 2010 was prepared by AquAeTer and documents their field monitoring activities conducted on June 8, 2010. The gas monitoring report contains monitoring results from the Phase 1 and 2 perimeter soil gas probes GP-06, GP-07, GP-10 through GP-20, structure probes GP-01 and GP-02, inside the shop and office, and confined spaces in the vicinity of the western boundary of the site. A map showing the gas probe locations, the scale house and maintenance shop is included as Figure 1. Section 2.3.1 of the Regulations Pertaining to Solid Waste Sites and Facilities, 6 CCR 1007-2, Part 1 (Regulations) requires that the concentration of explosive gases shall not exceed (A) 25% of the lower explosive limit (LEL) (1% by volume in air for methane) within facility structures, and (B) the LEL (5% by volume in air for methane - i.e., percent methane) at the facility boundary. During this monitoring event, methane was detected in structure probe GP-01 at a concentration of 32.9% and perimeter probe GP-10 at a concentration of 10.1%. Combustible gas above regulatory limits was not detected in any of the other probes, shop, office or confined spaces. The facility is currently operating under an approved gas remediation plan prepared in response to elevated gas concentrations in structure probe GP-01 and perimeter probes GP-10 and GP-11. The plan includes monthly monitoring of these probes and utility corridor access points along WCR 25. Included in Attachment 1 are the March, April and May 2010 monthly reports. A summary of the test results for these monthly events is provided in the following table. 2010-1630 (6 V o/U /L 0 777 Letter Jerry Henderson and Troy Swain July 1, 2010 Page 2 CH4 Concentration Monitoring Probe March 2010 April 2010 May 2010 GP-01 15.1 19.4 27.4 GP-10 8.8 1.9 0.5 GP-11 0.0 0.0 0.0 No methane was observed in the utility corridor access points or facility structures during the monthly monitoring. The approved remediation plan also included the installation of passive gas vents in waste along the western limit of the disposal area. As stated in the plan, the passive vents, which were installed in December 2009, may require one or more years to show consistent reduction in methane concentrations at perimeter probes GP-10 and GP-11 and structure probe GP-01. Until methane concentrations are below the regulatory threshold for three consecutive monthly events, monthly monitoring will continue to be performed. Continuous methane monitors are in operation within the facility maintenance building, office and gatehouse and no methane detections have been observed. If you have any questions regarding this report, please contact me at (303) 914-1445. Sincerely, On behalf of North Weld Landfill Tom Schweitzer Engineering Manager cc: Kim Ogle, WCDPS, w/o enc. Bill Hedberg, NWLF AquAeltr optimizing 7430 E. Caley Avenue, Ste 310 ° Centennial, CO 80111 . Phone (303) 771-9150 . Fax (303) 771-8776 June 15, 2010 103220 Tom Schweitzer, Site Engineer Waste Management 2400 W. Union Avenue Englewood, CO 80110 RE: Transmittal of Second Quarter 2010 Landfill Gas Monitoring Report North Weld Landfill, Ault, Colorado Dear Mr. Schweitzer: This letter presents the results of second quarter 2010 landfill gas monitoring by AquAeTer, Inc., for the North Weld Landfill, in Ault, Colorado. Monitoring was done on June 8, 2010. This letter should be placed in the landfill operating record to document the monitoring event. BACKGROUND Methane monitoring for gas at perimeter gas probes and structures is conducted according to applicable State of Colorado regulations contained in Colorado Department of Public Health and Environment (CDPHE) 6 CCR 1007-2, Part 1 Hazardous Materials and Waste Management Division, effective December 30, 2008, Section 2.3, Explosive Gases. Methane content measured in the field is expressed as percent methane by volume in air. Methane is combustible and ignitable in concentrations ranging between approximately five and 15 percent (volume) in air. The lower explosive limit (LEL) is approximately equal to five percent(volume) methane in air. PROCEDURE During the second quarter 2010, landfill gas was monitored at landfill perimeter gas probes, confined spaces and structures. For gas probe monitoring AquAeTer followed the Waste Management Landfill Gas Probe Monitoring (Vadose Zone Monitoring) method. A Landtec GEM 2000+ was calibrated in the field using calibration gas (a mixture of 50 percent methane, 35 percent carbon dioxide, and 15 percent nitrogen), and ambient (fresh) air. The field calibration was recorded in the field notebook, and a copy is retained with the sampling records. North Weld Landfill 103220 June 15, 2010 Page 2 1. At perimeter gas probes, subsurface gas concentrations were measured as follows. • Connect the instrument sample tube onto the gas probe's sample port. • Open the valve to take a pressure reading. • Operate the sampling pump through a carbon filter until readings stabilize and record the methane, oxygen, and carbon dioxide concentrations on the instrument display. 2. If stabilized, elevated methane concentrations are observed: • Bar Hole Probing (BHP) is performed, offset ten feet from the gas probe. • BHP is continued at ten foot intervals moving away from the waste footprint until a stabilized methane concentration of zero is obtained. 3. Measure methane, oxygen, and carbon dioxide concentrations inside on-site structures and confined spaces. Record the stabilized values observed. A table summarizing the monitoring results is included with this letter. RESULTS During the second quarter 2010 monitoring event, methane was detected in gas probes GP-01 and GP-10. Both GP-01 and GP-10 exhibited an elevated methane concentration that exceeded five percent (volume) in air. Methane was detected in gas probe GP-01 at a stabilized concentration of 32.9 percent (volume) in air with a charcoal filter. Methane was detected in gas probe GP-10 at a stabilized concentration of 10.1 percent(volume) in air with a charcoal filter. Bar hole probing, as described in the Waste Management Landfill Gas Probe (Vadose Zone Monitoring) guide, confirmed that detectable methane was not present in the BHP made ten feet from probes GP-01 and GP-10 in the direction away from the waste footprint. Methane was not detected in any of the structures or confined spaces. The next special monthly monitoring at select North Weld Landfill gas probes, buildings, and confined spaces is scheduled to occur in July 2010. The next regular quarterly monitoring at all gas probes and structures is scheduled to occur in September 2010. North Weld Landfill 103220 June 15, 2010 Page 3 If you have any questions pertaining to the landfill monitoring, please contact us by telephone at (303) 771-9150, by facsimile at (303) 771-8776, or by electronic mail at cstewart@aquaeter.com. Sincerely, AquAeTer, Inc. JJ /1 Zt :rC�C'? ( `n Q'INNir_ W.MZT1.11tt- Terra Plute, E.I. Cathryn Stewart,P.G. Project Engineer Project Manager attachment: Landfill Gas Monitoring Results Table for Second Quarter 2010 (6/8/10) Well Condition Inspection Forms (6/8/10) cc: Mr. Bill Hedberg, District Manager Project# 103220 Task# 04 Sampler D.Gezon L.Major Date 6/8/2010 LANDFILL GAS MONITORING RECORD Name of Facility: North Weld Landfill Location (City,State): Ault, CO Date of Sampling Event: 6/8/2010 Barometric Probe Monitoring Depth to Total Time CH, Pressure Pressure (in. Filtered? Point Water(ft) Depth (ft) (24 hr) of H O) (%) (in. of Hg) Gas Probes GP-01 DRY 14.9 12:19 24.98 +0.01 32.9 Y GP-01 - BHP NA NA 12:27 24.98 NA 0.0 Y GP-02 DRY 14.4 12:39 24.98 +0.01 0.0 Y GP-06 DRY 60.9 13:02 24.98 -0.09 0.0 Y GP-07 DRY 42.8 12:49 24.98 +0.01 0.0 Y GP-10 DRY 63.4 12:03 24.98 +0.01 10.1 Y GP-10-BHP NA NA 12:12 24.98 NA 0.0 Y GP-11 47.91 51.3 11:47 24.98 0.00 0.0 Y GP-12 DRY 39.3 11:32 24.98 -0.04 0.0 Y GP-13 DRY 21.4 11:22 24.98 0.00 0.0 Y GP-14 DRY 45.1 11:08 24.98 +0.01 0.0 Y GP-15 DRY 51.6 11:00 24.98 0.00 0.0 Y GP-16 DRY 42.5 10:51 24.98 -0.01 0.0 . Y GP-17 DRY 32.8 10:33 25.01 0.00 0.0 Y GP-18 DRY 32.3 10:21 25.00 0.00 0.0 Y GP-19 DRY 46.2 10:05 25.00 -0.009 0.0 Y GP-20 DRY 41.2 9:48 25.00 -0.002 0.0 Y Buildings Old Scale House 13:38 24.98 NA 0.0 Y Old Scale House-Confined space NM NM NA NM NA New Scale house 13:28 24.98 NA 0.0 Y Maintenance Shop 13:27 24.98 NA 0.0 Y Maintenance Shop-SE Corner NM NM NA NM NA Maintenance Shop-NE Corner NM NM NA NM NA Maintenance Shop-NW Corner NM NM NA NM NA Maintenance Shop-SW Corner NM NM NA NM NA Confined Spaces A Valve Box 13:23 24.98 NA 0.0 Y B North Water Line Vault 13:24 24.98 NA 0.0 Y C South Water Line Vault 13:24 24.98 NA 0.0 Y D Wash Pad Drain 13:25 24.98 NA 0.0 Y E North Blue Pipe Vault 13:35 24.98 NA 0.0 Y F South Blue Pipe Vault 13:35 24.98 NA 0.0 Y Notes: All gas readings are 0-100%by volume in air. NA-Not Applicable NM-Not Measured 1-Readings taken off Landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 6/8/10 airport code KGXY Page 1 of 2 Project# 103220 Task# 04 Sampler D.Gezon L.Major Date 6/8/2010 Gas Instrument Brand: Landtec Model: GEM 2000+ Serial No.: GM12269 Rental No.: 15685 Date of Calibration: 6/8/2010 Calibrated by: DTG Calibration Gas Manufacturer: SpecAir Lot No.: 007778 Expiration Date: 6/17/11 Calibration Gas: 50 %CH4 35 %CO2 Balance Nitrogen Accuracy: +/-5 Other: Sampling Personnel: Dan Gezon Company: AquAeTer, Inc. Sampling Personnel: Laura Major Company: AquAeTer, Inc. Pre-Monitoring Weather Conditions: Time: 09:35 Temperature: 64.4(°F) Wind: 13.8 mph from N Barometric Pressure: 30.09 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Scattered Clouds Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology v Other(specify:Weather Underground2) Post-Monitoring Weather Conditions: Time: 13:55 Temperature: 75.2(°F) Wind: 6.9 mph from ESE_ Barometric Pressure: 30.06 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Overcast Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology r Other(specify:Weather Underground2) Notes: All gas readings are 0-100%by volume in air. NA-Not Applicable NM-Not Measured 1-Readings taken off Landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 6/8/10 airport code KGXY Page 2 of 2 --.--p a to 5 E ai vila -;.:------------------- :1---:-.-*„.-., , t c if -4—P :i, 4 re if._ ,, �' .� LJ '1 , ' ro , '. ri l'I .. ,, , ,ki �,. f/. Ike m N. I �M \ \ç {\ i\ ` k f..fi�r J to = 1 i 4\:\,,, wi ,ii," :i 1 \\4, ev ;l} 1. a ri i it IMO . .,.` �'� 1 / =i- �,. ; 1-t.a. i �" j 'a /4' II, : i ' 44.:r\ C C i / "-\\'` ' if ! % \\\H, \ Tr;:„4);\;:\t:\I i . • -H . 1) 3 IA r � 1 \ 3 { 1' el sttr I :;.;:-3.3_,-------) . —✓ / 1. it .-- .11 -- ' —1 iri. . 5; i—); g '1;47- -- ,• / .J #1 y It .t .t S ATTACHMENT 1 NORTH WELD LANDFILL MARCH, APRIL AND MAY 2010 MONTHLY GAS MONITORING REPORTS Project# 103220 Task# 04 Sampler TAP and DTG Date 3/9/10 LANDFILL GAS MONITORING RECORD Name of Facility: North Weld Landfill Location (City,State): Ault,CO Date of Sampling Event: 3 / 9 / 2010 Barometric Probe Monitoring Depth to Total Time CH4 Pressure Pressure (in. Filtered? Point Water(ft) Depth (ft) (24 hr) of Hz0) (%) (in. of Hg) Gas Probes GP1 NM 14.9 13:37 24.60 +0.05 15.1 Y GP1-BHP NA NA 13:48 24.60 NA 0.0 Y GP10 NM 63.3 13:21 24.60 +0.04 8.8 Y GP10- BHP NA NA 13:31 24.60 NA 0.0 Y GP11 NM 51.1 13:12 24.60 -0.06 0.0 Y Buildings Maintenance Shop-Int.-SE Corner 13:57 24.60 NA 0.0 V Maintenance Shop-Int.-NE Corner 13:58 24.60 NA 0.0 Y Maintenance Shop-Int.-NW Corner 13:59 24.60 NA 0.0 V Maintenance Shop-Int.-SW Corner 14:00 24.60 NA 0.0 Y Old Scale House-Ext. 14:08 24.60 NA 0.0 V Old Scale House-Int. 14:10 24.60 NA 0.0 Y New Scale House-Ext. 13:15 24.60 NA 0.0 V New Scale House-Int. 13:17 24.60 NA 0.0 Y Confined Spaces A Valve Box 13:52 24.60 NA 0.0 Y B North Water Line Vault 13:53 24.60 NA 0.0 Y C South Water Line Vault 13:54 24.60 NA 0.0 Y D Wash Pad Drain 13:55 24.60 NA 0.0 Y E North Blue Pipe Vault 14:13 24.60 NA 0.0 Y F South Blue Pipe Vault 14:14 24.60 NA 0.0 Y Gas Instrument Brand: Landtec Model: GEM 2000 Serial No.: GM05605 Rental No.: 02572 Date of Calibration: 3 / 9 / 2010 Calibrated by: TAP and DTG Calibration Gas Manufacturer: SpecAir Lot No.: 007778 Expiration Date: 6/17/11 Calibration Gas: 50 %CH4 35 %CO2 Balance Nitrogen Accuracy: +1-5 Other: Sampling Personnel: Terra Plute Company: AquAeTer, Inc. Sampling Personnel: Dan Gezon Company: AquAeTer, Inc. Pre-Monitoring Weather Conditions: Time: 12:55 Temperature: 53.6(°F)Wind: 27.6 mph from NNW Barometric Pressure: 29.61 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Clear Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology.' Other(specify:Weather Underground') Post-Monitoring Weather Conditions: . Time: 14:15 Temperature: 53.6(°F)Wind: 23.0 mph from North Barometric Pressure: 29.58_inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Mostly Cloudy NoteWeather Data from: ❑ Gas Instrument On-Site Meteorology Other(specify:Weather Underground') All gas readings are 0-100%by volume in air. NR-Not Recorded,NA-Not Applicable 1-Readings taken off Landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 3/9/10,airport code KGXY Page 1 of 1 Project f! 103220 Task# 04 Sampler TAP and CRS Date 4/9/10 LANDFILL GAS MONITORING RECORD Name of Facility: North Weld Landfill Location (City,State): Ault, CO Date of Sampling Event: 4 / 9 / 2010 Barometric Probe Monitoring Depth to Total Time 1 CH4 Pressure Pressure (in. Filtered? Point Water(ft) Depth (ft) (24 hr) (%) of H0 (in. of Hg) H20) Gas Probes GP1 NM 14.9 14:15 24.79 -0.059 19.4 Y GPI- BHP NA NA 14:25 24.79 NA 0.0 Y GP10 NM 63.3 13:30 24.84 -0.025 1.9 Y GP10- BHP NA NA 13:35 24.84 NA 0.0 Y GP11 NM 51.1 13:47 24.84 -0.038 0.0 Y Buildings Maintenance Shop-Int.-SW Corner 14:37 24.79 NA 0.0 V Maintenance Shop-Int.-NW Corner 14:38 24.79 NA 0.0 Y Maintenance Shop-Int.-NE Corner 14:40 24.79 NA 0.0 Y Maintenance Shop-Int.-SE Corner 14:41 24.79 NA 0.0 Y New Scale House-Ext. 13:50 24.84 NA 0.0 Y New Scale House-Int. 13:50 24.84 NA 0.0 Y Confined Spaces A Valve Box 14:30 24.79 NA 0.0 Y B North Water Line Vault 14:32 24.79 NA 0.0 Y C South Water Line Vault 14:33 24.79 NA 0.0 Y D Wash Pad Drain 14:36 24.79 NA 0.0 Y E North Blue Pipe Vault 15:09 24.79 NA 0.0 V F South Blue Pipe Vault 15:10 24.79 NA 0.0 Y Gas Instrument Brand: Landtec Model: GEM 2000 Serial No.: GM08268 Rental No.: 08843 Date of Calibration: 4 / 9 / 2010 Calibrated by: TAP and CRS Calibration Gas Manufacturer: SpecAir Lot No.: 007778 Expiration Date: 6/17/11 Calibration Gas: 50 %CH4 35 %CO? Balance Nitrogen Accuracy: +/-5 Other: Sampling Personnel: Terra Plute Company: AquAeTer, Inc. Sampling Personnel: Cathryn Stewart Company: AquAeTer, Inc. Pre-Monitoring Weather Conditions: Time: 13:15 Temperature: 59.0(°F)Wind: 10.4 mph from SE Barometric Pressure: 29.94 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Clear Weather Data from: ❑ Gas Instrument On-Site Meteorology./ Other(specify: Weather Underground) Post-Monitoring Weather Conditions: Time: 15:15 Temperature: 62.6(°F)Wind: 17.3_mph from SSE Barometric Pressure: 29.88 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Clear Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology Other(specify: Weather Underground?) Notes: All gas readings are 0-100%by volume in air. NM-Not Measured,NA-Not Applicable 1-Readings taken off Landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 4/9/10,airport code KGXY Page 1 of 1 Project# 103220 Task# 04 Sampler TAP and DTG Date 5/7/10 LANDFILL GAS MONITORING RECORD Name of Facility: North Weld Landfill Location (City,State): Ault, CO Date of Sampling Event: 5 / 7 / 2010 Barometric Probe Monitoring Depth to Total Time 1 CH4 Pressure Pressure (in. Filtered? Point Water(ft) Depth (ft) (24 hr) (in. of Hg) of H20) (%) Gas Probes GP1 NM 14.4 13:44 25.11 0.110 27.4 Y GP1- BHP NA NA 13:54 25.11 NA 0.0 V GP10 NM 63.4 13:29 25.11 -0.03 0.5 Y GP10- BHP NA NA 13:39 25.11 NA 0.0 Y GP11 39.06 51.2 13:08 25.11 -0.010 0.0 Y Buildings Maintenance Shop-Int.-SW Corner 14:04 25.11 NA 0.0 Y Maintenance Shop-Int.-NW Corner 14:03 25.11 NA 0.0 Y Maintenance Shop-Int.-NE Corner 14:02 25.11 NA 0.0 Y Maintenance Shop-Int.-SE Corner 14:05 25.11 NA 0.0 Y New Scale House-Ext. 13:12 25.11 NA 0.0 Y New Scale House-Int. 13:13 25.11 NA 0.0 Y Confined Spaces A Valve Box 13:57 25.11 NA 0.0 Y B North Water Line Vault 13:57 25.11 NA 0.0 Y C South Water Line Vault 13:59 25.11 NA 0.0 Y D Wash Pad Drain 14:00 25.11 NA 0.0 Y E North Blue Pipe Vault 14:17 25.11 NA 0.0 Y F South Blue Pipe Vault 14:18 25.11 NA 0.0 Y Gas Instrument Brand: Landtec Model: GEM 2000 Serial No.: GM05605 Rental No.: 02572 Date of Calibration: 5 / 7 / 2010 Calibrated by: TAP and DTG Calibration Gas Manufacturer: SpecAir Lot No.: 011770 Expiration Date: 2/19/13 Calibration Gas: 50 %CH, 35 %CO, Balance Nitrogen Accuracy: +/-5 Other: Sampling Personnel: Terra Plute Company: AquAeTer, Inc. Sampling Personnel: Dan Gezon Company: AquAeTer, Inc. Pre-Monitoring Weather Conditions: Time: 12:55_Temperature: 51.8(°F)Wind: 11.5 mph from WNW Barometric Pressure: 30.20_inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Scattered clouds Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology.' Other(specify: Weather Underground?) Post-Monitoring Weather Conditions: Time: 14:35 Temperature: 53.6(°F)Wind: Calm mph from Calm Barometric Pressure: 30.21 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Overcast Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology Other(specify:Weather Underground2) Notes: All gas readings are 0-100%by volume in air. NM-Not Measured,NA-Not Applicable 1-Readings taken off landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 5/7/10,airport code KGXY Page 1 of 1 Hello