MO-9286_40750_G_C_20220121

January 21, 2022
Duke Energy 526 South Church Street Mail Code EC13K
Charlotte, North Carolina 28202 Attention: Christopher Gilbert Re: Acknowledgement of Receipt Marshall Steam Plant – Gas UST 8320 NC Highway 150, Sherrills Ford Catawba County Incident Number: 40750 Dear Mr. Gilbert:
On January 4, 2022, the Division of Waste Management’s Underground Storage Tank Section, Mooresville Regional Office, received the Air Sparging Soil Vapor Extraction Pilot Testing data for the above-referenced incident. This
information has been reviewed and will remain in the UST Section’s files. Per the submitted schedule, the approved corrective action was to be implemented in December 2021. Groundwater samples should be collected quarterly for the first year, and semi-annually thereafter. The first groundwater sampling event should be conducted in April 2022, with the
results received by this office within 30 days of sample collection. The groundwater samples must be submitted to a North Carolina certified laboratory for the appropriate analyses as set forth in the UST Section’s Assessment Guidelines. In addition, a Corrective Action Performance Report must be submitted at the end of each quarter of system operation. The first report must be received no later than the April 30, 2022. If you have any questions regarding the actions that must be taken, or the rules mentioned in this letter, please contact me at the address or telephone number listed below for the Mooresville Regional Office. Sincerely,
Brad C. Newton, P.G.
Hydrogeologist Mooresville Regional Office UST Section, Division of Waste Management, NCDEQ cc: Catawba County Health Department Michael Hays – ERM (via e-mail)