15011_BASF ENKA Landfill 2020 Methane Monitoring Change_20200513

828.774.9655 • 43 College Place, Suite 212, Asheville, NC 28801
www.headwaterenvironmental.com
May 13, 2020

Tracy Wahl
Western District Supervisor/Brownfields/DWM
North Carolina Department of Environmental Quality
339 New Leicester Hwy # 140
Asheville, North Carolina 28806

Re: Landfill Gas Monitoring Schedule Change Request
Bob Lewis Ballpark / Former BASF Landfill
Brownfields Project # (15011-11- 011)
164 Jacob Holm Way
Candler, North Carolina 28715

Dear Ms. Wahl:

Headwater Geology, PLLC. (Headwater), on behalf of Enka Youth Sports Organization (Enka
Youth) prepared this letter to request a modification of the landfill gas monitoring schedule for the
Former BASF Landfill Brownfields Property, current Bob Lewis Ballpark, located at 164 Jacob
Holm Way, Candler, Buncombe County, North Carolina (the Site).

To help slow or prevent the spread of the Coronavirus (Covid-19), tournaments have not been
held during the 2020 season and have been cancelled through at least mid-May 2020, but
potentially longer. The Site, including the ball field, parking area, and concession stand is not
currently in use other than basic upkeep activities such as mowing, landscaping, and general
maintenance, etc.

Headwater performed a single landfill gas monitoring event on April 3, 2020 to evaluate the
effectiveness of methane management measures. Concentrations of methane and hydrogen
sulfide were measured using a Gem 5000 landfill gas meter. Neither methane nor hydrogen
sulfide were detected. A map from the Methane Management Plan, prepared by Anchor QEA, and
dated January 9, 2019, showing monitoring locations is attached. The attached Table 1—Landfill
Gas Monitoring Results—2020 includes the most recent results. The Gem 5000 landfill gas meter
was pre-calibrated by Eastern Solutions, LLC, the equipment provider. Equipment calibration
records are also attached.

Historical monitoring results for 2018 were reported in the Methane Management Plan are
attached and historical monitoring results for 2019 that were reported in the 2019 Methane
Monitoring Report, prepared by Headwater and dated March 24, 2020, are also attached. Please
note that concentrations of methane exceeding the screening level, but below the lower explosive
limit (LEL) were detected in open electrical conduits that penetrated the building floor in July 2019.
These results were confirmed during a monitoring event performed the following week in August
2019. Because of these readings, mitigation measures were implemented and the open conduits
were sealed both inside the building and outside of the building where it was discovered the
conduits terminated in the subsurface without a sufficient seal. A detailed summary of mitigation
measures and subsequent confirmation monitoring is described in the 2019 Methane Monitoring
Report.

Landfill Gas Monitoring Schedule Change Request
Former BASF Landfill Brownfields Site
2
Headwater recommends that monitoring be postponed until just before the Site is planned to be
used again. Monitoring at the Site has been performed between July 2018 and April 2020. During
that period, screening levels were exceeded during only two events (July 30 and August 7, 2019).
The source of those exceedances was discovered and addressed as described in the 2019
Methane Monitoring Report. The results of subsequent monitoring events performed in
September 2019 and April 2020 indicate that mitigation and management measures have been
successful. Further, the April 2020 monitoring event was performed before the concession stand
had been opened for the season. If landfill gases were infiltrating the concession stand or other
Site improvements, they would be expected to be the most elevated during a time when ingress
and egress and other activities that would allow air exchange were not being performed.
Monitoring is not performed during the off-season. Generally, the off season is between mid-
October and mid-March. Therefore, monitoring is not performed for a period of approximately 5
to 6 months. As such, if the 2020 season is cancelled in its entirety, at least one additional
monitoring event should be performed in September 2020.

Once the season is resumed, monitoring should then be performed at a similar schedule as
proposed in the Methane Management Plan. For example, a monitoring event would be performed
the week before a tournament is scheduled at the Site, a second event would be performed 2 weeks
later, and a third event would be performed one month after the second event. Subsequent
monitoring events would be performed bi-monthly for the remainder of the season, as needed.
Should a landfill gas related event occur, reporting and mitigation measures will be performed as
described in the Methane Management Plan. Should these circumstances or other circumstances
require a change in the monitoring schedule, that change will be coordinated with the Brownfields
Program.

Thank you for working with us on this request If you have questions, please contact us.

Respectfully Submitted,

Headwater Geology, PLLC

Adam Tripp, PG
Senior Geologist

Attachments:
 Methane Management Plan (Anchor QEA 2019) Figure 3 – Methane Monitoring Location
Map
 Table 1—Landfill Gas Monitoring Results—2020
 2019 Methane Monitoring Report (Headwater 2020) Historical Landfill Gas Monitoring
Results—2019
 Methane Management Plan (Anchor QEA 2019) Historical Landfill Gas Monitoring
Results—2018
 Equipment Calibration Records (2020)

Methane Management Plan (Anchor QEA 2019)
Figure 3 – Methane Monitoring Location Map

2FIELD 1FIELD 2FIELD 3CB-1CB-2CB-3UPFLOOR DRAIN, TYP.CONDUITPENETRATION,TYP.MEN'STOILETFOODSTORAGECONCESSIONSCOUNTERWOMEN'STOILETMECH.ROOMFAMILYTLT.OFFICIAL'SROOMELECTRICALROOMFLOOR DRAINCONDUIT PENETRATIONMONITORING LOCATIONSEWER CLEANOUT (SC)CATCH BASIN (CB)TRANSFORMERIRRIGATION CONTROL BOXMONITORING LOCATIONSCALE: 1" = 100'0' 100'50' 200'NORTHFigure 3Methane Monitoring Location PlanMethane Management PlanFormer BASF Landfill, Asheville, NCCONCESSIONS STAND LEGENDSCALE: 1" = 10'0' 10'5'20'2 - CONCESSION STAND ENLARGEMENTPublish Date: 2018/12/03 11:33 AM | User: kyoungbloodFilepath: \\Asheville1\Asheville\Projects\Roberts and Stevens\Enka Partners-BASF\CAD\Figure 3 - Methane_Monitoringdwg.dwg Figure 3 - Methan MontoringAnchor QEA of North Carolina, PLLCLEGENDNORTH
Table 1—Landfill Gas Monitoring Results—2020

Table 1
Landfill Gas Monitoring Results—2020
Former BASF Landfill Brownfields Site
Area
Monitoring 
Location
Date of 
Monitoring
Organic 
Vapor/CH4
(ppm)
CH4
(%)
H2S
(ppm) Comments
Irrigation Control 
Boxes (Field 1)4/3/2020 NM 0.0 0
Irrigation Control 
Boxes (Field 2)4/3/2020 NM 0.0 0
Irrigation Control 
Boxes (Field 3)4/3/2020 NM 0.0 0
Ambient Air 4/3/2020 NM 0.0 0
Catch Basin‐1 4/3/2020 NM 0.0 0
Catch Basin‐2 4/3/2020 NM 0.0 0
Catch Basin‐3 4/3/2020 NM 0.0 0
Transformer 4/3/2020 NM 0.0 0
Ambient Air 4/3/2020 NM 0.0 0
Concessions 
Counter 
(Penetrations)
4/3/2020 NM 0.0 0
Food Storage 
(Penetrations)4/3/2020 NM 0.0 0
Bathrooms 
(Penetrations)4/3/2020 NM 0.0 0
Electrical Room 
(Penetrations and 
Ambient Air)
4/3/2020 NM 0.0 0
Mechanical Room 4/3/2020 NM 0.0 0
Officials Room 4/3/2020 NM 0.0 0
Ambient Air 4/3/2020 NM 0.0 0
2,500 0.25 10
Notes:
Monitoring Measurements include only the most elevated reading collected from a penetration or ambient air in an area.
     Measurements in the electrical room include conduit penetration measurments shown in the comments.
Monitoring The concentrations of methane and hydrogen sulfide were measured
Equipment       with a Landtec Gem 5000 landfill gas monitor.
CH4 Methane
H2SHydrogen sulfide
%Percent of total air volume
ppm Part per million
CH4  Screening The Site Screening Level for organic vapor and methane is 5% of the lower explosive limit (LEL) of methane.
    The LEL of methane is 5% by air volume. 
H2S Screening The Site Screening Level for hydrogen sulfide is the Occupational Safety and Health Administration PEL of 10 ppm.
NM This parameter was not measured during this sampling event.
Fields
Screening Level: 5% of the LEL / PEL
Parking Area
Parking Area
Concession 
Stand
Concession 
Stand
Page 1 of 1
2019 Methane Monitoring Report (Headwater
2020) Historical Landfill Gas Monitoring
Results—2019

Table 1
Landfill Gas Monitoring Results
Former BASF Landfill Brownfields Site
Area
Monitoring 
Location
Date of 
Monitoring
Organic 
Vapor/CH4
(ppm)
CH4
(%)
H2S
(ppm) Comments
3/13/2019 9.0 NM NM
3/29/2019 15.0 0.0 0
4/23/2019 1.2 to 75 NM NM
5/15/2019 15.0 0.0 0
6/27/2019 7.8 NM NM
7/30/2019 6.2 0.0 NM
8/7/2019 3.7 0.0 0
9/5/2019 4.5 NM NM
3/13/2019 17.0 NM NM
3/29/2019 25.0 0.0 0
4/23/2019 1.5 to 55 NM NM
5/15/2019 15.7 0.0 0
6/27/2019 7.7 NM NM
7/30/2019 6.3 0.0 NM
8/7/2019 3.6 0.0 0
9/5/2019 4.6 NM NM
3/13/2019 7.0 NM NM
3/29/2019 0.9 0.0 0
4/23/2019 1.8 NM NM
5/15/2019 16.1 0.0 0
6/27/2019 8.1 NM NM
7/30/2019 6.8 0.0 NM
8/7/2019 3.6 0.0 0
9/5/2019 4.5 NM NM
3/13/2019 7.5 NM NM
3/29/2019 1.1 0.0 0
4/23/2019 0.5 NM NM
5/15/2019 7.8 0.0 0
6/27/2019 6.5 NM NM
7/30/2019 6.2 0.0 NM
8/7/2019 3.7 0.0 0
9/5/2019 4.5 NM NM
3/13/2019 6.2 NM NM
3/29/2019 1.3 0.0 0
4/23/2019 0.5 NM NM
5/15/2019 3.8 0.0 0
6/27/2019 6.8 NM NM
7/30/2019 5.8 0.0 NM
8/7/2019 4.1 0.0 0
9/5/2019 4.8 NM NM
3/13/2019 6.2 NM NM
3/29/2019 3.5 0.0 0
4/23/2019 0.7 NM NM
5/15/2019 3.7 0.0 0
6/27/2019 6.8 NM NM
7/30/2019 6.2 0.0 NM
8/7/2019 4.1 0.0 0
9/5/2019 4.7 NM NM
3/13/2019 6.5 NM NM
3/29/2019 1.4 0.0 0
4/23/2019 0.8 NM NM
5/15/2019 3.8 0.0 0
6/27/2019 6.9 NM NM
7/30/2019 6.1 0.0 NM
8/7/2019 4.1 0.0 0
9/5/2019 4.7 NM NM
2,500 0.25 10
Notes on final page
Fields
Ambient Air
Catch Basin‐3
Parking Area
Irrigation 
Control Boxes 
(Field 1)
Irrigation 
Control Boxes 
(Field 2)
Irrigation 
Control Boxes 
(Field 3)
Catch Basin‐1
Catch Basin‐2
Screening Level: 5% of the LEL / PEL
Page 1 of 3
Table 1
Landfill Gas Monitoring Results
Former BASF Landfill Brownfields Site
Area
Monitoring 
Location
Date of 
Monitoring
Organic 
Vapor/CH4
(ppm)
CH4
(%)
H2S
(ppm) Comments
3/13/2019 6.4 NM NM
3/29/2019 2.6 0.0 0
4/23/2019 0.5 NM NM
5/15/2019 6.8 0.0 0
6/27/2019 6.9 NM NM
7/30/2019 6.1 0.0 NM
8/7/2019 4.0 0.0 0
9/5/2019 4.8 NM NM
3/13/2019 6.4 NM NM
3/29/2019 1.5 0.0 0
4/23/2019 1.7 NM NM
5/15/2019 3.6 0.0 0
6/27/2019 6.8 NM NM
7/30/2019 6.0 0.0 NM
8/7/2019 4.1 0.0 0
9/5/2019 4.7 NM NM
3/13/2019 7.5 NM NM
3/29/2019 8.1 0.0 0
4/23/2019 1.8 NM NM
5/15/2019 11.0 0.0 0
6/27/2019 9.4 NM NM
7/30/2019 8.5 0.0 NM
8/7/2019 6.8 0.0 0
9/5/2019 4.9 NM NM
3/13/2019 7.0 NM NM
3/29/2019 3.0 0.0 0
4/23/2019 2.1 NM NM
5/15/2019 6.8 0.0 0
6/27/2019 9.3 NM NM
7/30/2019 8.4 0.0 NM
8/7/2019 6.8 0.0 0
9/5/2019 4.9 NM NM
3/13/2019 8.5 NM NM
3/29/2019 3.3 0.0 0
4/23/2019 4.5 to 20 NM NM
5/15/2019 6 to 20 0.0 0
6/27/2019 12.0 NM NM
7/30/2019 7.9 0.0 NM
8/7/2019 6.7 0.0 0
9/5/2019 5.0 NM NM
2,500 0.25 10
Notes on final page
Transformer
Ambient Air
Concessions 
Counter 
(Penetrations)
Food Storage 
(Penetrations)
Bathrooms 
(Penetrations)
Parking Area
Screening Level: 5% of the LEL / PEL
Concession 
Stand
Page 2 of 3
Table 1
Landfill Gas Monitoring Results
Former BASF Landfill Brownfields Site
Area
Monitoring 
Location
Date of 
Monitoring
Organic 
Vapor/CH4
(ppm)
CH4
(%)
H2S
(ppm) Comments
3/13/2019 11.2 NM NM
3/29/2019 10.7 0.0 0
4/23/2019 50.0 NM NM Spray paint odor in room. 50 to 150ppm measured in conduits.
5/15/2019 7.8 0.0 0
6/27/2019 14.7 NM NM
7/30/2019 126.0 0.0 NM ~20,000 ppm, 1.8%  from certain conduit penetrations
8/7/2019 48.0 0.0 0 ~11,000 ppm, 1.2%  from certain conduit penetrations
8/8/2019 NM 0.0 0
~0.5% in certain penetrations prior to sealing. 0.0% in ambient 
air, before and after sealing.
9/5/2019 5.2 NM NM
3/13/2019 6.5 NM NM
3/29/2019 3.0 0.0 0
4/23/2019 1.8 NM NM
5/15/2019 7.9 0.0 0
6/27/2019 9.3 NM NM
7/30/2019 8.2 0.0 NM
8/7/2019 6.8 0.0 0
9/5/2019 5.0 NM NM
3/13/2019 7.2 NM NM
3/29/2019 10.7 0.0 0
4/23/2019 2.7 NM NM
5/15/2019 7.5 0.0 0
6/27/2019 11.3 NM NM
7/30/2019 16.5 0.0 NM
8/7/2019 10.2 0.0 0
9/5/2019 5.2 NM NM
3/13/2019 7.0 NM NM
3/29/2019 2.8 0.0 0
4/23/2019 1.8 NM NM
5/15/2019 7.5 0.0 0
6/27/2019 9.4 NM NM
7/30/2019 17.2 0.0 NM
8/7/2019 10.5 0.0 0
9/5/2019 5.0 NM NM
2,500 0.25 10
Notes:
Monitoring Measurements include only the most elevated reading collected from a penetration or ambient air in an area.
     Measurements in the electrical room include conduit penetration measurments shown in the comments.
Monitoring The organic vapor concentration was collected using a Thermo TVA‐2020 flame ionization detector (FID).
Equipment       The concentrations of methane and hydrogen sulfide were measured
      with a Landtec Gem2000 or 2000+ landfill gas monitor.
CH4 Methane
H2SHydrogen sulfide
%Percent of total air volume
ppm Part per million
CH4  Screening The Site Screening Level for organic vapor and methane is 5% of the lower explosive limit (LEL) of methane.
    The LEL of methane is 5% by air volume. 
H2S Screening The Site Screening Level for hydrogen sulfide is the Occupational Safety and Health Administration PEL of 10 ppm.
NM This parameter was not measured during this sampling event.
Screening Level: 5% of the LEL / PEL
Concession 
Stand
Electrical 
Room 
(Penetrations 
and Ambient 
Air)
Mechanical 
Room
Officials Room
Ambient Air
Page 3 of 3
Methane Management Plan (Anchor QEA 2019)
Historical Landfill Gas Monitoring Results—
2018

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Equipment Calibration Records (2020)