2906_DavidsonCoCDLF_Comment_CQAforLFClosure_DIN27813_20170522

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Chao, Ming-tai
From:Chao, Ming-tai
Sent:Monday, May 22, 2017 11:26 AM
To:'Pieter Scheer'
Cc:Buck, Rex; Sink, Steven; Heim, Susan A
Subject:Comments on Davidson County C&D Landfill (Permit No. 2906-CDLF) Closure - CQA
Report
Hi Pieter:

The Solid Waste Section completes a review of the certified CQA Report (DIN 27735) of the above-referenced
landfill and has several comments (DIN 27813) stated below:

DIN 27813
1. (Section 5.2)
a. The closed area for the C&DLF is approximately 7.6 acres as reported in Section 1.0. This section
records the earthen material of 21,200 cubic yards (CY) was used to construct the two-feet
vegetative soil layer; back-calculation of the extent of the closed area, based on the data from the
CQA Report, shows the closed area is approximately 6.57 acres. If the closed area is 7.6 acres,
should the soil volume for the 2-foot vegetative soil layer be approximately 24,523 cy? Please
clarify.

b. If the amount of soil of 21,200 CY is correct, the number of testing of Atterberg Limits (ASTM D
4318) shall be five (5) according to the testing frequency in Table 9.1 of the approved CQA Plan
(DIN 26957). Appendix E -Earth Work CQA Data only provide four (4) Atterberg Limits test
results. Please provide the missing data.

2. (Section 7.3) The quantity of LLDPE received for the project is 3 roll/1 lot and 51,060 square feet (SF)
according to the Agru shipping document. The stated 51,750 SF in this section is likely a typo. Please
verify.

3. (Appendix G)
a. According the approved Technical Specification Section 02778, Paragraph C.2.b., please provide the
copy of manufacturer’s and workmanship warranties to the CQA report.

b. According the approved Technical Specification Section 02778, Paragraph D.3.b. & Section 5.3.2 of
the CQA Plan, please provide the copy of the LLDPE prepared subgrade / surface of the
intermediate soil layer acceptance form to the CQA report.

c. According to Agru shipping paper (Doc# 35927) the resin lot # is CGK810470 for the 3 rolls of 40-
mil LLDPE used in the project, but the Oven-aging test and UV-aging test done by Chevron Philips
are on material with different Lot # or Roll #. Please clarify.

d. The seam number P10-12 has been repeated in the Non-Destructive Testing Form; it is likely that
one of them is a typo of P11-12, which is not available in the form.

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Please contact me if you have any questions on the above-mentioned comments. Have a wonderful day.

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]
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: Tuesday, May 16, 2017 10:43 AM
To: Chao, Ming-tai <[e-mail]>
Cc: Buck, Rex <[e-mail]>; Sink, Steven <[e-mail]>; Scheer, Pieter
<[e-mail]>
Subject: Davidson County C&D Landfill (Permit No. 2906-CDLF) Closure - CQA Report

Ming:

Please use the links below to access a transmittal letter and the CQA report for the closure of the C&D landfill unit. Just
let me know if you have any difficulties accessing the files.

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

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From: Pieter Scheer [mailto:[e-mail]]
Sent: Tuesday, May 16, 2017 10:38 AM
To: [e-mail]
Cc: [e-mail]
Subject: Pieter Scheer has shared files with you

I've shared files with you

01 M Chao Letter 2017-05-16 (DC C&DLF Closure).pdf

DC C&DLF Closure CQA Report 2017-05.pdf

Your access expires on 06/16/2017

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