6403_NashCDLF_March2017_Q4CDGasMonitoringTransittal_20171117

1100 Crescent Green Drive, Suite 208 • Cary, North Carolina 27518 • O: 919-792-1900 • F: 866-311-7206
December 18, 2017
Mr. William W. Hill, Jr., M.P.H. - Health Director Nash County
Health Department
P. O. Box 849 Nashville, NC
27856

RE: Results of Landfill Gas Monitoring – November 2017
Nash County C&D Landfill Nashville, Nash County, North Carolina Permit # 64-03

Dear Mr. Hill:

This letter presents the results of landfill gas monitoring conducted at the site referenced above on
November 14, 2017. Landfill gas was monitored using a calibrated GEM-2000 landfill gas monitor at
the 12 on-site gas monitoring probes. A site map showing the locations of the landfill gas monitoring
probes is attached as Figure 1. The results of monitoring at each of the gas monitoring probes are
summarized in the attached Landfill Gas Monitoring Data Forms.

The landfill gas reading at MM-7 was greater than 100% of the lower explosive limit (LEL). The
methane reading at MM-7 was 14.1%. The % LEL and methane reading measured at this gas
monitoring probe is indicative of soil gas conditions proximal to an extensive stockpile of land clearing
debris, and not believed to be associated with the C&D landfill. Moreover, access to the site in the
vicinity of this probe is restricted to trained landfill personnel who are aware of these conditions.
Landfill gas and methane were not detected at any of the remaining gas monitoring probes. It is
anticipated that methane levels at MM-7 will drop below the LEL with the ongoing removal of the land
clearing debris stockpile.

The results of the November 2017 landfill gas monitoring are consistent with previous monitoring
events completed at the site, including the reading taken at location MM-7.

The next quarterly landfill gas monitoring event is scheduled for February 2017. If you have any
questions or require further assistance regarding this matter, please do not hesitate to call me at
919-792-1904.

Mr. William Hill
December 18, 2017
Page 2 of 2
Sincerely,
Garrett & Moore, Inc.

Craig M. Fortner, P.E.

Cc: Jaclynne Drummond, NCDENR, Division of Waste Management, Solid Waste Section
Ben Barnes – Solid Waste Director, Nash County

NC Division of Waste Management - Solid Waste Section
Landfill Gas Monitoring Data Form
Notice: This form and any information attached to it are "Public Records" as defined in NC General Statute 132-1. As such, these documents are available for inspection and examination by any person upon request (NC General Statute 132-6).

Facility Name: Nash County C&D Landfill Permit Number: 64-03

Sampling Date: 11/14/17 NC Landfill Rule (.0500 or .1600): .0500

Sample Collector Name & Position: Isaac Hardison, EIT

Gas Meter Type & Serial Number: GEM 2000+, GM08230-05 Gas Meter Calibration Date: 11/14/17

Field Calibration Date & Time: 11/14/17, 9:45 AM
Field Calibration Gas Type (15/15 or 35/50): 35/50 CO2 & CH4 ; 50/25 CO & H2S
Field Calibration Gas Canister Expiration Date: 08/31/19
Gas Meter Pump Rate: NA
Ambient Air Temperature: 50 ̊ F Barometric Pressure (in. or mm Hg): 29.89mm Weather Conditions: Sunny
Instructions: Under “Location or LFG Well”, list monitoring well # or describe monitoring location (e.g., inside field office). Attach a test location map or drawing. Report methane readings as both % LEL and % CH4 by volume.
Convert % CH4 (by volume) to % LEL as follows: % methane (by volume)/20 = % LEL. *Hydrogen Sulfide (H2S) gas monitoring may be required for Construction & Demolition Landfills (CDLFs). See
individual permit conditions and/or Facility LFG monitoring plan.
Location or
LFG Well ID
Sample
Tube
Purge

Time of Day
Time
Pumped
(sec)

Initial
% LEL

Stabilized
% LEL

% CH4 (volume)

% O2 (volume)

% CO2 (volume)

% H2S* (volume)

NOTES
MM-1 1 min 13:01 60 0 0 0 19.5 2.4 0
MM-2 1 min 13:07 60 0 0 0 15.0 6.9 0
MM-3 1 min 13:13 60 0 0 0 15.7 5.0 0
MM-4 1 min 13:28 60 0 0 0 15.5 4.6 0
MM-5 1 min 13:34 60 0 0 0 15.6 5.1 0
MM-6 1 min 12:50 60 0 0 0 14.9 4.2 0
MM-7 1 min 12:47 60 2 >>> 14.10 0.4 10.4 0
MM-8 1 min 12:30 60 0 0 0 10.3 15.6 0
MM-9 1 min 12:35 60 0 0 0 11.7 9.9 0
MM-10 1 min 12:42 60 0 0 0 10.3 5.3 0
MM-11 1min 12:56 60 0 0 0 10.9 9.5 0
MM-12 1 min 13:10 60 0 0 0 20.2 7.5 0
NOTE: If needed, attach additional data forms to include additional LFG monitoring data locations for the facility.
ACTION LEVELS: Methane: >1.25% by volume (inside structures) AND >5% by volume (at facility boundary) Hydrogen Sulfide: >1% by volume (inside structures) AND >4% by volume (at facility boundary)
Certification To the best of my knowledge, the information reported and statements made on this data submittal and attachments are true and correct. I am aware that there are significant penalties for making any false statement, representation, or certification including the possibility of a fine and imprisonment.

Professional Engineer
SIGNATURE TITLE
Revised – November 17, 2017