9202_EastWake_MSWLF_MetalsASDResponse_DIN28772_20180223 (2)

February 23, 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
East Wake Closed Unlined MSW Landfill – Rigsbee Property
Wake County
Solid Waste Permit Number 9202-MSWLF-1981
DIN 28772

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 28771) and submitted on behalf of
Wake County by CDM Smith for the East Wake Closed Unlined MSW Landfill-Rigsbee Property, Solid Waste
Permit Number 9202-MSWLF-1981. 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
also determine if the metal detections are naturally occurring.

Wake County is requesting approval of a monitoring schedule until their 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 well MW-01; 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 East Wake
Closed Unlined MSW Landfill-Rigsbee Property. 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