3420_OmnisourcesIndusLF_Comment_sloperepaire_wkPlan_FID1322075_20190606

From:Chao, Ming-tai
To:Winegar, James
Cc:Heim, Susan A; Stanley, Sherri; Aja, Deborah; Watkins, Jason; Mussler, Ed
Subject:Re: [External] K"ville North Slope Repair Plan, Permit # 34-20
Date:Wednesday, June 5, 2019 3:08:59 PM
Attachments:3420_OmnisourceIndusLF_Comments_SlopeRepairPlan_FID1280856_20190219.pdfpastedImage.pngpastedImage.pngpastedImage.png
Dear Mr. Winger:
The Solid Waste Section receives your email and attached drawings, lab testing results, CQA
Plan & stormwater calculation for the hurricane-damaged slope restoration. The submittal is
incomplete and not acceptable one, because it is not signed and sealed by a professional
engineer registered in the State of North Carolina as mentioned in the email message date
02/19/2019 (see attachment). This engineer is fully responsible for this slope
design, calculations, CQA plan pertaining to the slope restoration at OmniSource Southeast
Industrial Landfill in accordance with North Carolina General Statute (N.C.G.S.) 89C.
Upon receiving the completed document, the Solid Waste Section will only review to see if
the submittal satisfies the minimum standard of practice of the slope restoration that integratesinto the inactive industrial landfill, Permit # 34-20. Please submit the complete application
document according to the guidance described in the attached e-mail message.

From: Winegar, James <[e-mail]>
Sent: Wednesday, June 5, 2019 1:56 PM
To: Chao, Ming-tai
Cc: Heim, Susan A
Subject: [External] K'ville North Slope Repair Plan

CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an
attachment to [e-mail]
We are getting close to finalizing our Kernersville facility’s North Slope Repair Plan and I
am attaching the following documents for your review and comment:

CQA Plan
Slope Repair Rev. 05142019
Stormwater Calculations
Soil Testing Results and Stability Analyses.

We plan to finalize the plan this week, after meeting with the contractor, our insurance
carrier, and the insurance carrier’s engineering firm. If there are any changes, I will
forward those to you when available.

Let me know if there are any questions or if you require any additional information…

Thanks,

James Winegar
Environmental Manager
919.989.3102 - work
919.796.3023 - cell

1
Chao, Ming-tai
From:Chao, Ming-tai
Sent:Tuesday, February 19, 2019 1:18 PM
To:'Winegar, James'
Cc:Heim, Susan A; Stanley, Sherri; Aja, Deborah
Subject:comments on OmniSource - K'ville slope Repairs
Dear Mr. Winegar:

After reviewing the submitted “Slope Grading and Repair Plan (Plan)” for the northern slope damaged by 2018
Hurricane, I have to consider this plan is incomplete and request the following documents, at a minimum to be
included in the final submittal.

1. The determination of limits of failure slope surface. “2018 Slope Failure Survey” is marked on Slope
Profile in Drawing No. CP-01. Is the failure slope surface determined/confirmed by a subsurface
investigation/soil testing report. The report should be a portion of the Plan which must be signed by an
engineer or geologist registered in the State of North Carolina.

2. Slope design. According to the Drawing No. CP-01, the new slope will be constructed with a 2
(horizontal) to 1 (vertical) angle- approximately 26.5 degrees. (i) There is no word about what kind
material to be used for slope restoration – soil with vegetative cover, 100% hard amour including
concrete/broken rock/riprap/gabion box, or soil with a hard amour system (ii) Is there a slope stability
analysis to support this design? A copy of the design should be a portion of the Plan. (iii) The
engineering parameters of the material for the slope re-construction (including density, strength, type,
moisture, etc.) that used in the slope stability analysis must be confirmed by the QA/QC testing program
through the established Construction Assurance Plan and technical specifications (see Item 3). The
slope design must be approved and signed by a professional engineer registered in the State of North
Carolina.

3. The Construction Assurance (CQA) Plan and technical specifications for slope restoration project. Plans
should describe the responsibility of each parties involved into this project and construction and material
specifications, QA/QC testing requirements (testing methods and testing frequencies), and the final as-
built drawings and construction completion report. The inputs and comments from the contractor –
Baker Construction Services and his subcontractor and the engineering consultant contracted by your
insurance company should be incorporated into the CQA Plan.

4. If you agree, the primary reason causing this slope damage is the failure of the existing stormwater
drainage system which had structural and hydraulic flaws - the old drainage system could not
carry/convey the storm water flow produced by the hurricane – flow capacity problem; the drainage
system is eroded by the flow with velocity/erosive force exceeding the ones designed for. The Plan fails
to consider the storm water drainage system on the top side of the slope. The new stormwater system
must be designed by a professional engineer registered in the State of North Carolina. Additionally, the
new 2 to 1 slope has not benching or other lateral drain devices/measures to prevent erosion from
surface runoff (you and I told about it on 10/05/2018 sit visit). The stream bank protection at the
downslope area is not available, either.

5. The final construction completion report and as-built drawings should be certified by a professional
engineer registered in the State of North Carolina.
2

The above-mentioned requirements are the minimum and based on my 30-yrs experiences in the
civil/environment engineering and construction business and NOT required by any NC Solid Waste
Management Rule. Whether or not to accept my suggestions, I leave this entirely up to your discretion of
course.

From: Winegar, James <[e-mail]>
Sent: Tuesday, February 19, 2019 11:47 AM
To: Heim, Susan A <[e-mail]>
Cc: Chao, Ming-tai <[e-mail]>
Subject: [External] OmniSource - K'ville Repairs

CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]

Attached is a copy of Joyce’s Slope Grading and Repair Plan for the northern slope of the landfill at our Kernersville
facility, which was damaged during Hurricane Florence.

A copy of this plan has been submitted to our proposed contractor, Baker Construction Services. Although Baker had
some technical questions, it was their opinion that the repair work could be completed as designed.

We have also submitted a copy of the plan to our insurance company, who has contracted with another engineering
firm to review. Once we get this review back, I should be able to finalize the revised project schedule – at this time I
would conservatively estimate repairs to be completed by the end of June.

Please let me know if there are any questions, comments, or suggestions concerning the repair plan…

Thanks,

James Winegar
Environmental Manger
919.989.3102 - work
919.796.3023 - cell

Ming-Tai, Chao
Environmental Engineer, Solid Waste Section
Division of Waste Management
North Carolina Department of Environmental Quality
919.707-8251 (Office)
[e-mail]