9209_NorthWake_Closed_MetalsASDResponse_DIN28765_20180222

February 22, 2018

Sent Via Email – [e-mail]
Mr. John Roberson
Wake County Solid Waste Director
336 Fayetteville Street
Raleigh, NC 27602

Re: Alternate Source Demonstration Redevelopment and Sampling Work Plan
North Wake Closed Unlined MSW Landfill
Wake County
Solid Waste Permit Number 9209-MSWLF-1984
DIN 28765

Dear Mr. Roberson,
The Solid Waste Section (Section) has completed a review of the Alternate Source Demonstration
Redevelopment and Sampling Work Plan dated December 20, 2017 (DIN 28764) and submitted on behalf of
Wake County by CDM Smith for the North Wake Closed Unlined MSW Landfill, Solid Waste Permit Number
9209-MSWLF-1984. The Alternate Source Demonstration Redevelopment and Sampling Work Plan was
submitted in response to elevated reported metal detections in monitoring wells at the site, and to determine
if the metal detections are naturally occurring.

Wake County is requesting approval of a monitoring schedule until Fiscal Year 2020 to redevelop monitoring
wells, sample the background monitoring wells to establish background concentrations, and to collect filtered
samples for dissolved metals analyses. Wake County is proposing the following: quarterly monitoring well
redevelopment and sampling events for the background monitoring wells MW-11 and MW-11D; monitoring
well redevelopment during the Fall 2017 and Spring 2018 semiannual sampling events; and collection of filtered
samples for dissolved metals analyses in monitoring wells where the turbidity is greater than 10 NTUs.

Based upon the information provided within the Alternate Source Demonstration Redevelopment and Sampling
Work Plan, the Section approves the time extension and additional activities as described for the North Wake
Closed Unlined MSW Landfill. If you have any questions or concerns regarding this letter, please feel free to
contact me by email at [e-mail] or by phone at 828.296.4706. Thank you for your
continued cooperation with this matter.

Sincerely,
Jaclynne Drummond
Hydrogeologist
Solid Waste Section, Division of Waste Management
NCDEQ

cc sent via email: Ed Mussler, Section Chief
Adam Ulishney, Environmental Compliance Branch Head
Jason Watkins, Field Operations Branch Head
Drew Hammonds, Eastern District Supervisor
Elizabeth Patterson, Environmental Senior Specialist
Ethan Caldwell, Permitting Engineer
Elliot Cornell, Wake County
Mat Colone, CDM Smith