7904_Rockingham_MSWLF_ResponsetoRequest_DIN 27761_20170509

2211 W. Meadowview Rd., #101
Greensboro, NC 27409
tel: [phone]
fax: [phone]
www.JoyceEngineering.com

May 9, 2017

Mr. Larry Frost
Engineering Project Manager
NCDEQ/Solid Waste Section
Asheville Regional Office
2090 UD Highway 70
Swannanoa, NC 28778

RE: Request Plan Updates, Landfill Facility and
Alternate Source Demonstration Addendum: Volatile Organic Compounds
Rockingham County Solid Waste Management Facility, Permit Nos. 7901 and 7904
Rockingham County, North Carolina
JOYCE Project No. 401.1701.12, Task No. 07

Dear Mr. Frost:

On behalf of Rockingham County, Joyce Engineering (JOYCE) has prepared this
response to your letter dated March 29, 2017, concerning your request for updated plans to
encompass the entire facility. This response also addresses Mr. Ervin’s letter dated April 4,
2017, concerning the Alternate Source Demonstration Addendum submitted on February 21,
2017. On April 28, 2017, JOYCE requested and obtained from Mr. Ervin an extension until
May 11, 2017, to submit a response to his April 4, 2017, letter so that our response could
incorporate responses to both letters.

In your letter, you requested an updated Water Quality Monitoring Plan, an updated
Landfill Gas Monitoring Plan, and an updated Operations Plan to be submitted within 60 days of
your letter for NCDEQ review and approval, or by May 28, 2017. These Plans are to encompass
both Permit Nos. 7901 and 7904. We are respectively requesting an extension to submit these
Plans to NCDEQ. As you are aware, the Permit to Operate for Permit No. 7904 expires on
August 27, 2018, and a Permit Renewal Application will be submitted to NCDEQ by February
27, 2018. Our specific extension request is to submit the following by August 27, 2017:
 A facility drawing showing the locations of all active groundwater wells, surface
water monitoring points, and point of discharge from subsurface (French) drain
systems at landfill 7901 and 7904.
 A facility drawing showing existing landfill gas probes, structures and enclosures
at landfill 7901 and 7904.
 A facility drawing for at landfill 7901 and 7904 that delineates the limits of all
activities located on the capped and closed landfill 7901. A request to use these
areas for the activities will accompany the drawing with an explanation of how
the closed landfill’s cap’s integrity will be protected while the activities occur.

Mr. Larry Frost
May 9, 2017
Page 2 of 3

We also request an extension to submit a complete updated Water Quality Monitoring Plan, a
complete updated Landfill Gas Monitoring Plan, and a complete updated Operations Plan that
encompass the entire facility by February 27, 2018, as part of the Permit Renewal Application.

Your letter also requested that the County must ensure that no more than 12 inches of
leachate is being stored over the liner by 1) inspecting all leachate collection system (LCS)
pumps, controls and level switches for proper function, and 2) cleaning all LCS lines with a high
pressure system and inspecting them with an in-line camera. You also requested that all of these
inspection results be submitted to NCDEQ. Rockingham County plans to conduct the LCS
inspection of all LCS pumps, controls and level switches between July 1 and August 31, 2017.
Inspection results will be submitted to NCDEQ within 30 days of completing the inspection and
will include conclusions and recommendations. Based on the results of the inspection and if
needed, Rockingham County will clean the LCS lines and inspect them with a camera after
submitting the LCS component inspection results and before December 31, 2017.

You also expressed concern with the leachate evaporation system. The County has
already removed the evaporation system from the pond. Rockingham County agrees to cease
operation the leachate evaporation system until such time that a Leachate Management Plan that
includes its operation is submitted to and approved by NCDEQ.

Rockingham County understands that NCDEQ will add the 7901 permit for closure to a
facility permit which encompasses both permits during the next modification or amendment of
Permit No. 7904. It is anticipated this will occur in 2018 during the renewal of the Permit to
Operate.

You have requested that engineered plans and specifications be submitted to NCDEQ for
approval for the collection and proper disposal of the discharge from Surface Water Monitoring
Point (SMP)-5. Our approach focuses on addressing the immediate concern with a temporary
solution, such as using a storage tank to collect the flow from the underdrain, to allow sufficient
time to conduct a site evaluation to ensure proper design of a concrete sump or other permanent
solution. The plans and specifications for the permanent solution will be submitted to NCDEQ
for approval.

In accordance with Mr. Lane’s letter dated April 4, 2017, we have included a schedule
for the landfill gas vent installation and concrete sump/permanent solution construction. The
schedule includes installing the temporary solution for the underdrain and the landfill gas vents,
and allowing time to observe the test results once the vents are installed, prior to designing the
permanent solution for the underdrain. The attached schedule includes preparing the plans and
specifications for each activity.

Mr. Larry Frost
May 9, 2017
Page 3 of 3

Please contact me at [phone] or [e-mail] if you have any
questions regarding this submittal.

Sincerely,
JOYCE ENGINEERING
Jennifer Johnson
Senior Technical Consultant
Attachment:
Proposed Construction Schedule

Cc: Kathryn Jolly, Solid Waste Program Manager, Rockingham County Landfill
Ervin Lane, NCDEQ
Mousa Maimoun, PhD, JOYCE

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20
1
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May 2017 2018