NC0047384_Correspondence_20190722

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Steve Drew
Water Resources Director
City of Greensboro
2602 S Elm -Eugene Street
Greensboro, NC 27406-9787
Dear Mr. Drew:
NORTH CAROLINA
Environmental Quality
July 22, 2019
Subject: Additional Monitoring Requirements
T.Z. Osborne WWTP
NPDES Permit No. NC0047384
The City of Greensboro has been conducting effluent monitoring for 1,4-dioxane since December 2017 as part
of the Division's investigation into sources of this compound. Compliance with a set limit may or may not be
technologically feasible and it appears most of the reductions will have to be achieved at the industrial source.
As a result, the Division has developed a Management Strategy for emerging compounds to seek reductions
through Municipal pretreatment programs by requiring industrial users to reduce, treat, or eliminate
discharges of these compounds. This process is expected to take time given that these compounds have been
used and discharged for years as unregulated compounds.
The goal will be to seek reductions that will result in Water Supply stream concentrations below EPA
recommended health advisories and for Permittees to eventually attain or comply with any NC state criteria or
standards adopted by the state.
At this time the Division is requesting the City provide their corrective action plan for locating and reducing
sources of 1,4-dioxane. If you have already taken measures outline any past activities, the outcomes from
those activities and any future plans. Please submit your plan to the PERCS Branch by September 23, 2019.
Please contact me at [phone] or Julie Grzyb at [phone] or via email
(iii stnarne.lastnanie(: ncdenr gov) if you have any questions or concerns.
Cc: Central Files
Regional Operations, WSRO
NPDES Permit File
DEQ1
incerely,
L
Deborah Gore, PERCS Supervisor
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mall Service Center I Raleigh, North Carolina 27699-1617
919.707.9000