HomeMy WebLinkAboutMO-6105_23108_CAFS_20230501_AdditionalInformation
1210 1st STREET SOUTH EXT, COLUMBIA, SC 29209 / phone: 803 783-3314 / www.armenv.com
May 1, 2023
Brad Newton
North Carolina UST Section - Mooresville Regional Office
North Carolina Department of Environmental Quality
610 East Center Avenue, Suite 301
Mooresville, North Carolina 28115
Re: Sadler’s Country Corner
Incident #23108; TA #23108-84
Corrective Action Feasibility Study – Additional Information
4232 Charles Raper Jonas Hwy. (Hwy 27)
Alexis, Gaston County, North Carolina
ARM Project #28-408.29-23
Dear Mr. Newton;
In response to the Notice of Regulatory Requirements (NORR) dated January 12, 2023,
the following additional information is provided regarding the Corrective Action Feasibility
Study submitted for the site. The additional information includes a rough cost estimate and
proposed schedule for the proposed active remediation, monitoring, and subsequent
monitored natural attenuation.
It is estimated that the remaining contaminants could be oxidized to concentrations at or
below regulatory thresholds within approximately three to four years. It should be noted
that the rough cost estimate is simply a projection at current market rates for these
services. Planning, oversight, and reporting are included in the cost estimates. Pricing and
technology should continue to be evaluated at each step during the active remediation
process.
If you should have any questions regarding the requested additional information, please
do not hesitate to contact our office.
Sincerely,
ARM Environmental Services, Inc.
Tim McCorkle Michael L. Faris, L.G.
Project Manager Sr. Geologist / Principal
N.C. Reg. #2270
cc: Ron Sadler
Sadler’s Country Corner; Incident #23108
Corrective Action Feasibility Study – Additional Information
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Page 2
Cost Estimate
Injection Well Installation:
Installation of four (4) 2”-diameter PVC injection wells $11,500
Chemical Oxidant Injection (Primary and Secondary):
Personnel / equipment for oxidant injection $37,000
Chemical Oxidant Consumables (Primary and Secondary):
Klosure SP sodium persulfate & 25% sodium hydroxide (bulk) $89,500
Groundwater monitoring on targeted well sets:
Semi-annual groundwater monitoring @ $6,000 per event $36,000
Proposed Schedule
Item Schedule Notes
Inject Chemical Oxidant
Injection – Pilot Study Completed August 2022 Klosure activated sodium persulfate injection pilot study.
Two temporary injection points completed in source area
Pilot Study Sampling Completed March 2023 Limited sampling showed overall decrease in
concentrations, though some increases were noted
Install Injection Wells 4th quarter 2023 Install four (4) 2” injection wells near source area
Chemical Oxidant
Injection (Primary) 1st quarter 2024 Complete oxidant injection in RW-1 and RW-2, as well as
four injection wells
Semi-Annual Sampling &
Monitoring Report Semi-annual Conduct sampling of limited subset of monitoring wells and
water wells per usual protocol
Chemical Oxidant
Injection (Secondary) 4th quarter 2024 Conduct additional injection (as necessary)
100% reduction goal
reached 2025 Verification period starts
Groundwater Samling
(confimation) 1st half 2026 Confirm target levels reached
Well Abandonment / Site
Restoration 2nd half 2026 Abandon monitoring, recovery, and injection wells