2906-DavidsonCoCDLF_CommentonClosurePlan_DIN26793_20161003

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Chao, Ming-tai
From:Chao, Ming-tai
Sent:Monday, October 03, 2016 11:33 AM
To:'Pieter Scheer'
Cc:Murray, John E
Subject:RE: Davidson County C&D Landfill (Permit No. 29-06)
Hi Pieter:

Please send me the electronic file of the approved Closure and Post-closure plan and CQA plan of the Davidson
County CDLF; it is evident that the requested plans are not available in the file or document tracking system. I
conducted a review of the documents that attached to the September 29, 2016 e-mail, few comments state
below:

1. What is the size (acreage) of the closed area? The permitted disposed area of the CDLF is 7.6 acres but the
drawings show the “Contract Limits” is 9.1 acres. Please clarify. The acreage will be used as the basis for
calculating post-closure care costs.
2. The approved maximum side slope of the final cap of the CDLF is 4 (horizontal) to 1 (vertical) as shown on
the Section 3.1 of the Facility and Engineering Plan dated March 2009 and revised April 2011 (DIN
13912). The proposed closure side slope is 3 to 1 or 4 to 1 as stated in the September 29, 2016 letter (DIN
26790). The section(s) of the closed cap has 3 to 1 side slope requires to be illustrated/noted on the closure
plan drawing(s), and the slope stability analysis of the 3 to 1 side slope must be submitted for a review and
approval.
3. The LLDPE is directly placed over the intermediate soil cover; therefore, the top 6-inch (at a minimum) of
this soil cover must be specified for the maximum soil grain size (including testing method and frequency)
and the final preparation (including the subgrade acceptance & the base-line survey) for receiving the
overlying LLDPE. The Specification Section 02223 – Embankment Table 1 Note 5 may be amended to
incorporate the revision or cross-referenced of Part D. 3 of Section 02778 - LLDPE.
4. A side riser pipe located in the Phase 1 area as shown on Sheet No. 3/Drawing No. S2 will be used for
leachate removal. Is there any special requirement(s) for protecting the pipe? How is the pipe incorporating
to the final closure cover? Please clarify.

Please contact me if you have any questions of the comments.

Ming Chao
Ming-Tai Chao, P.E.
Environmental Engineer
Permitting Branch, Solid Waste Section
NCDEQ, Division of Waste Management
(Mailing Address)
1646 Mail Service Center
Raleigh, NC 27699-1646

(Street Address)
Green Square, 217 West Jones Street
Raleigh, NC 27603
Tel. [phone]
[e-mail]
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http://portal.ncdenr.org/web/wm/sw

E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.

From: Pieter Scheer [mailto:[e-mail]]
Sent: Thursday, September 29, 2016 3:42 PM
To: Mussler, Ed <[e-mail]>
Cc: Chao, Ming-tai <[e-mail]>; Heim, Susan A <[e-mail]>; Buck, Rex
<[e-mail]>; Sink, Steven <[e-mail]>; Scheer, Pieter
<[e-mail]>
Subject: Davidson County C&D Landfill (Permit No. 29-06)

Ed:

Per my email last week, please use the link below to access our letter which includes:

1. Notification of Intent to Close;
2. Request for Alternative Final Cover System; and
3. Request for Extension of Period for Closure.

I would like to meet with you soon to review in particular the alternative final cover system so that the County may be
able to proceed with the bidding of the project while this request is being considered. I’m available next Tuesday (10/4)
(anytime from 9 a.m. on), Wednesday (10/5) (10 a.m. to 1 p.m.) or early the following Monday and Tuesday (10/10 and
10/11) most anytime. Let me know if any of these days/times works for you and/or if you need any additional
information.

Thanks.

Pieter

Pieter K. Scheer, P.E.
Vice President, Senior Engineer

SMITH + GARDNER

14 N. Boylan Avenue
Raleigh, NC 27603

P [phone]
F [phone]
C [phone]
www.smithgardnerinc.com

From: Pieter Scheer [mailto:[e-mail]]
Sent: Thursday, September 29, 2016 3:27 PM
To: [e-mail]
Cc: [e-mail]
Subject: Pieter Scheer has shared a file with you

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I've shared a file with you

E Mussler 2016-09-29 Letter (DC C&D Closure Notification & Alt FCS Request).pdf

Your access expires on 10/30/2016

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