2803_DareCoCDLFPermitMODReq_DIN25737_20160308.pdf

Attachment A
Stockpile Triaxial Test Results

2200 Westinghouse Blvd., Suite 103 • Raleigh, NC 27604 • Phone [phone] • Fax [phone] • www.geotechnics.net

CONSOLIDATED UNDRAINED TRIAXIAL TEST
WITH PORE PRESSURE READINGS
ASTM D4767-11
Client:CDM SMITH, INC.Boring No.:STOCKPILE
Client Reference: DARE COUNTY C&D LF Depth (ft):N/A
Project No.:2015-775-001 Sample No.: N
Lab ID:2015-775-001-001
a =0.00 C =0.00
30.2 35.60
Tested By: AF Date: 12/7/15 Approved By: MPS Date: 12/14/15
page 1 of 12 DCN: CT-S28 DATE: 4/12/13 REVISION: 3 Sigmatriax.xls
0
2
4
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18
0 5 10 15 20 25 30
Q,

(
p
s
i
)
P, (psi)
Consolidated Undrained Triaxial Test with Pore Pressure
Max. Effec. Stress Ratio Points Failure Envelope Test No. 1 Test No. 2 Test No. 3


2200 Westinghouse Blvd., Suite 103 • Raleigh, NC 27604 • Phone [phone] • Fax [phone] • www.geotechnics.net

CONSOLIDATED UNDRAINED TRIAXIAL TEST
WITH PORE PRESSURE READINGS
ASTM D4767-11
Client:CDM SMITH, INC.Boring No.:STOCKPILE
Client Reference: DARE COUNTY C&D LF Depth (ft):N/A
Project No.:2015-775-001 Sample No.: S
Lab ID:2015-775-001-002
a =0.00 C =0.00
26.2 29.46
Tested By: SFS Date: 12/9/15 Approved By: MPS Date: 12/17/15
page 1 of 12 DCN: CT-S28 DATE: 4/12/13 REVISION: 3 Sigmatriax.xls
0
5
10
15
20
25
0 5 10 15 20 25 30 35 40
Q,

(
p
s
i
)
P, (psi)
Consolidated Undrained Triaxial Test with Pore Pressure
Max. Effec. Stress Ratio Points Failure Envelope Test No. 1 Test No. 2 Test No. 3


Attachment B
Global Stability Analysis Scenarios
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1V
Section 7 • Geotechnical Evaluation

7-12 (revised March 2016)
7.6 Slope Stability Analysis
7.6.1 General
Slope stability analyses were performed for the proposed Phase V expansion by using SLOPE/W
version 2012 software program distributed by GEO-SLOPE International, Ltd. Stability analyses were
performed for the following cases:
• End of waste placement condition and
• Final closure condition after final cap system installed.
7.6.2 Subsurface Design Properties
The assumed design properties for the subsurface soils are based upon SPT N-values and laboratory
testing and are listed in Table 7-3.
7.6.3 Landfill Design Properties
The final landfill components will consist of the following in order of their occurrence below final
closure grade;
• 18-inch-thick erosion layer,
• 18-inch-thick low permeability barrier layer,
• C&D waste, and
• Minimum 5-foot-thick compacted fill pad.
The assumed design properties of the components are listed in Table 7-4.
Table 7-4: Summary of Material Design Properties
Layer
No. Materials
Unit
Weight
(pcf)
Friction
Angle
(degrees)
Cohesion
(psf)
Basis for Parameter
Selection
1 Erosion Layer 120 28 0 From 2005 Permit
Application Report
and also CDM’s
Experiences on
Similar Projects
2 Low Permeability Barrier Layer 110 26 0
2 C&D (Waste) 65 27.5 0
3 Compacted Fill Layer 120 28 0

7.6.4 Global Stability Analyses
7.6.4.1 General
Analyses for overall (global) stability was performed using the SLOPE/W 2012 modeling software
package from Geo-Slope International. This computer program uses the inputted slope geometry, soil
and waste properties, and groundwater conditions and calculates a factor of safety failure of the
overall landfill mass. The minimum acceptable factor of safety against overall slope failure before,
during, and after waste placement is 1.5.

5-1 (revised March 2016)
Section 5
Compacted Fill (Base Pad)
The materials, construction and certification requirements in this Section are intended to comply with
Rule .0542 (2) and .0542 (5). This section applies to requirements for construction of the C&D
landfills base pad.
5.1 Materials
A. Compacted fill materials shall conform to the following properties:
Soil Classification ASTM D2487 SC, ML, CL, MH, CH
(Upper two feet of base
pad only)
As-Built Thickness Topographic landfill base pad
Survey minimum thickness will be 5 ft
Internal Friction Angle ASTM D3083 28 degrees
or ASTM D4767
* The Engineer may modify these conformance test properties based on the results of initial conformance testing,
provided modification of these results does not compromise the hydraulic conductivity or internal friction angle test
results.
B. Compacted fill shall be a mineral soil free of organic material, loam, wood, trash, snow, ice, frozen
soil, and other objectionable material.
C. The Contractor shall use adequate construction quality control (CQC) to verify the conformance of
materials according to this section. The Contractor shall submit to the Engineer, within 30 days of
the effective date of the Agreement, representative samples from the soil source(s). In the case
that the submitted samples fail to conform to the required criteria, the Contractor may locate
another source, and upon approval of that source by the Engineer, submit samples from the new
source for conformance testing at the cost of the Contractor.
D. If the Contractor plans to use any blending of soils as compacted fill material, the Contractor shall
submit the blended soil for the Engineer's approval in accordance with the requirements.
5.2 Conformance Testing
A. Initial conformance testing shall be performed by the quality assurance laboratory (QAL) on
samples from the soil source to assure compliance with the Specifications. The samples will be
obtained from multiple test pits to be dug by the Contractor under the direction of the QAL. The
following tests shall be performed on the samples.
1. Soil Classification (ASTM D2487)
2. Sieve Analysis (ASTM D422)
3. Atterberg Limits (ASTM 4318)
1
Chao, Ming-tai
From:Colone, Mathew <[e-mail]>
Sent:Tuesday, March 08, 2016 1:45 PM
To:Chao, Ming-tai
Subject:RE: Dare County Phase V PTC - Materials Testing Revision
Attachments:Section 5_Engineering Plan_ Appendix B_Geotechnical_Appendix D_Revised
03082016.pdf; Section 5_Engineering Plan_ Appendix B_Geotechnical_Page 7-12
_Revised 03082016.pdf; Section 6_CQA Plan_Section 5_Page 5-1_Revised 03082016.pdf
Follow Up Flag:Follow up
Flag Status:Flagged
Thanks Ming,
See attached. Revised pages for CQA Plan (Section 6, page 5-1), Engineering Plan (Section 5, Appendix B, page 7-12), and
Engineering Plan (Section 5, Appendix B, Appendix D).
Please let me know if you need anything else.
Thanks again!
Mat

From: Chao, Ming-tai [mailto:[e-mail]]
Sent: Tuesday, March 08, 2016 12:37 PM
To: Colone, Mathew <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision

Hi Mat:

E-mail me of the revised page(s) is just fine. I will combine the all submittal into a single document & DIN for filing &
reviewing/approval purposes.

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.
2

From: Colone, Mathew [mailto:[e-mail]]
Sent: Tuesday, March 08, 2016 12:24 PM
To: Chao, Ming-tai <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision

Thanks Ming.
I’ll check, but I think that the CQA section 5 is the only place that the 30 degree friction angle reference resides. That
being said, can I email you the revised section(s)?
Thanks,
Mat
From: Chao, Ming-tai [mailto:[e-mail]]
Sent: Tuesday, March 08, 2016 10:46 AM
To: Colone, Mathew <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision

Hi Mat:

A quick thought. In addition to the document that you sent to me yesterday, you may also have to update the Section 5
– Compact Fill (base Pad) of the CQA Plan and/or other area in the approved PTC Application for Phase V (DIN 24526)
that may be subject to revision due to this change/modification.

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: Colone, Mathew [mailto:[e-mail]]
Sent: Monday, March 07, 2016 5:35 PM
To: Chao, Ming-tai <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision

Ok. I'll get it signed in the morning and send it on.
3
Thanks,
Mat

-------- Original message --------
From: "Chao, Ming-tai" <[e-mail]>
Date: 03/07/2016 4:54 PM (GMT-05:00)
To: "Colone, Mathew" <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision
Mat: Any NC PE with CDM Smith can sign/approve it. Thanks.

Ming

From: Colone, Mathew [mailto:[e-mail]]
Sent: Monday, March 07, 2016 4:49 PM
To: Chao, Ming-tai <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision

No problem. Kenton is out this week. Can the geotechnical engineer (Jintao Wen) seal that letter?
Thanks!
Mat

From: Chao, Ming-tai [mailto:[e-mail]]
Sent: Monday, March 07, 2016 4:47 PM
To: Colone, Mathew <[e-mail]>
Cc: Wen, Jintao <[e-mail]>; Yang, Kenton <[e-mail]>; Edward Lee Mann
<[e-mail]>; Shanna Fullmer <[e-mail]>; Clyde Gard <[e-mail]>;
Mussler, Ed <[e-mail]>
Subject: RE: Dare County Phase V PTC - Materials Testing Revision

Hi Mat:

This request involves the change of design and construction spec of the project; by law, we need a NC PE to
sign/seal/approve the modification document. I am sorry to be picky on this matter, and Kenton can do it (co-
sign the letter) easily.
4

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: Colone, Mathew [mailto:[e-mail]]
Sent: Monday, March 07, 2016 3:54 PM
To: Chao, Ming-tai <[e-mail]>
Cc: Wen, Jintao <[e-mail]>; Yang, Kenton <[e-mail]>; Edward Lee Mann
<[e-mail]>; Shanna Fullmer <[e-mail]>; Clyde Gard <[e-mail]>
Subject: Dare County Phase V PTC - Materials Testing Revision

Hi Ming,
5
Attached is a letter request to revise the geotechnical testing requirements for the Dare County Phase V base
pad. In particular, we are requesting a variance from the specified internal friction angle of the base pad material
in the Permit To Construct. The minimum angle specified in the PTC is 30 degrees and we are requesting a
variance to a minimum of 28 degrees.
We intend to put the project out to bid within the next two weeks, with construction to start in late May or June.
Please let me know if you have any questions.
Thanks,
Mat Colone

Mathew F. Colone, P.G. | Geologist | CDM Smith | 5400 Glenwood Avenue, Suite 400 Raleigh, NC 27612 |
T: 919-325-3569 | F: 919-781-5730 | www.cdmsmith.com