4117_A1SandrockCDLF_FinalCQA_Phase2B_DIN28454_20170908

1
Chao, Ming-tai
From:Ronnie Petty <[e-mail]>
Sent:Friday, September 08, 2017 11:55 AM
To:Rice, Sarah M
Cc:[e-mail]; Chao, Ming-tai; Chelie Lacrosse; Watkins, Jason; Mussler, Ed
Subject:Re: A-! Sandrock, Inc. financial assurance.
Sarah,

I am good with the numbers, if we can make sure Chelie gets the the proper inflation numbers I am sure we can get the
rider out to you first of next week.

Ronnie Petty
[phone]
The linked image cannot be displayed. The file may have been mov ed, renamed, or deleted. Verify that the link points to the correct file and location.

On Sep 8, 2017, at 11:32 AM, Rice, Sarah M <[e-mail]> wrote:
Good morning David and Ronnie,

I hope you both are well. Please see the review of the financial assurance estimates below for A-1
Sandrock. The closure and post-closure estimates have been approved as requested as they are revised
for 2017 dollar amounts. The potential assessment and corrective action cost estimate has not been
accounted for inflation since 2014 and is required to do so. If everyone is in agreement with the
estimated numbers below, then we can proceed with modification of the financial assurance
mechanisms. Please let me know your thoughts.

Regards,
Sarah

Sarah M Rice
DWM-SWS Compliance Officer and NCDEQ Title VI Coordinator
NC Dept of Environmental Quality

919 707 8287 office/fax
[e-mail]

Physical Address:
217 West Jones Street
Raleigh, NC 27603

Mailing Address:
1646 Mail Service Center
Raleigh, NC 27699-1646

<image001.png>

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

2

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: Chao, Ming-tai
Sent: Friday, September 08, 2017 10:24 AM
To: Rice, Sarah M <[e-mail]>
Subject: RE: A-! Sandrock, Inc. financial assurance.

Hi Sarah:

I reviewed the cost estimates and have no comments on them. The dollar values that shown on your e-
mail message are correct.

Ming

From: Rice, Sarah M
Sent: Wednesday, September 06, 2017 2:23 PM
To: Chao, Ming-tai <[e-mail]>
Subject: A-! Sandrock, Inc. financial assurance.

I want to confirm the 2017 financial assurance cost estimates, based on 16 acres for closure and post-
closure of Phase 1 and 2.

Closure – Phase 1 and 2 (16 acres) $748,743.00
Post-Closure – Phase 1 and 2 (16 acres) $19,180.00/year x 30 years = $575,400.00
PACA – 1, 000, 000.00 set in 2014 x inflation for 2015 (1.014), 2016 (1.010), and 2017 (1.013) =
$1,037,454.00

Regards,
Sarah

Sarah M Rice
DWM-SWS Compliance Officer and NCDEQ Title VI Coordinator
NC Dept of Environmental Quality

919 707 8287 office/fax
[e-mail]

Physical Address:
217 West Jones Street
Raleigh, NC 27603

Mailing Address:
1646 Mail Service Center
Raleigh, NC 27699-1646

<image006.png>
3

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

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: Garrett, David [mailto:[e-mail]]
Sent: Tuesday, September 05, 2017 2:51 PM
To: Chao, Ming-tai <[e-mail]>; Raup, Michael <[e-mail]>;
'[e-mail]' <[e-mail]>
Cc: Mussler, Ed <[e-mail]>; Rice, Sarah M <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

Please see the attached Financial Assurance calculations. Thank you.

Please take note:
After Sept 11, my corporate email address will change:
[e-mail]
All other contact info will remain the same. Thank you.

G. David Garrett, P.G., P.E.
Senior Engineer
Amec Foster Wheeler Environment & Infrastructure, Inc.
4021 Stirrup Creek Drive – Suite 100
Durham, North Carolina 27703
[e-mail]

Phone: [phone]
Direct line: 919-765-0070
Cell: 919-418-4375

From: Chao, Ming-tai [mailto:[e-mail]]
Sent: Wednesday, August 16, 2017 1:03 PM
To: Garrett, David <[e-mail]>; Raup, Michael <[e-mail]>;
'[e-mail]' <[e-mail]>
Cc: Mussler, Ed <[e-mail]>; Rice, Sarah M <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

Gentlemen:

After conducting a quick research of the financial assurance/cost estimates for closure and post
closure in the approved PTC -Phases 2 Application (DIN 24958) for A-1 Sandrock CDLF, I
found out the PTC application only covered required costs for Phase 1 & Phase 2A,
approximately 12.58 acres. The costs for closure and post-closure cares of Phase 2B (with waste
4
footprint about 3.42 acres) is not included in the approved PTC document. Please prepare and
submit the update Closure & Post-Closure Plan including cost estimates plus annual inflation
adjustment & 1 million dollar PACA. The new FA mechanism to cover the costs over 16-acre
Phases1 & 2 must be submitted to the Solid Waste Section for a review and approval prior to
issuance of new PTO for Phases 2B.

Thank you for your cooperation on this matter.

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

<image007.png>
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: Chao, Ming-tai
Sent: Wednesday, August 16, 2017 12:12 PM
To: 'Garrett, David' <[e-mail]>; Raup, Michael <[e-mail]>
Cc: Mussler, Ed <[e-mail]>; Ritter, Christine <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

Gentlemen:

The Solid Waste Section (SWS) received the CQA report for A-1 Sandrock CDLF – Phase 2B;
this document was scanned and uploaded to the Laserfiche with a DIN 28401. The SWS will
review the document shortly.

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
5
Raleigh, NC 27603
Tel. [phone]
[e-mail]
http://portal.ncdenr.org/web/wm/sw

<image007.png>
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: Mussler, Ed
Sent: Wednesday, August 16, 2017 11:24 AM
To: Chao, Ming-tai <[e-mail]>
Subject: FW: A-1 Sandrock CQCD Report

From: Raup, Michael [mailto:[e-mail]]
Sent: Monday, August 07, 2017 12:21 PM
To: Mussler, Ed <[e-mail]>
Cc: Garrett, David <[e-mail]>
Subject: A-1 Sandrock CQCD Report

Mr. Mussler,

Please find the attached CQCD Report for A-1 Sandrock Inc., CDLF.

Michael Raup, P.E.
Geotechnical Engineer, Amec Foster Wheeler Environment & Infrastructure
4021 Stirrup Creek Drive – Suite 100, Durham, North Carolina 27703, USA
T +01 919 381 9343 M +01 423 943 1038
[e-mail] amecfw.com

This message is the property of Amec Foster Wheeler plc and/or its subsidiaries and/or affiliates and is intended only
for the named recipient(s). Its contents (including any attachments) may be confidential, legally privileged or
otherwise protected from disclosure by law. Unauthorised use, copying, distribution or disclosure of any of it may be
unlawful and is strictly prohibited. We assume no responsibility to persons other than the intended named recipient(s)
and do not accept liability for any errors or omissions which are a result of email transmission. If you have received
this message in error, please notify us immediately by reply email to the sender and confirm that the original message
and any attachments and copies have been destroyed and deleted from your system. If you do not wish to receive
future unsolicited commercial electronic messages from us, please forward this email to:
[e-mail] and include “Unsubscribe” in the subject line. If applicable, you will continue to
receive invoices, project communications and similar factual, non-commercial electronic communications.

Please click http://amecfw.com/email-disclaimer for notices and company information in relation to emails originating
in the UK, Italy or France.
1
Chao, Ming-tai
From:Ritter, Christine
Sent:Friday, September 08, 2017 12:50 PM
To:Garrett, David; Raup, Michael; [e-mail]
Cc:Chao, Ming-tai; Mussler, Ed
Subject:RE: A-1 Sandrock CQCD Report
The cross-sections illustrating the required 4-feet of separation between estimated long-term seasonal high
groundwater table and existing base grade submitted for the Phase 2B Permit to Operate have been reviewed and
approved. Please begin to think about submitting the Phase 3 Design Hydro Report in preparation of the Phase 3 Permit
to Construct Application review process so that unnecessary delays will not be encountered for the next Permit to
Construct issuance.

Christine Ritter
Hydrogeologist
Solid Waste Section
Division of Waste Management
NC Dept of Environmental Quality

919 707 8254 office
[e-mail]

Mailing address:
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Physical address:
217 West Jones Street
Raleigh, NC 27603

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

From: Garrett, David [mailto:[e-mail]]
Sent: Tuesday, September 05, 2017 2:54 PM
To: Ritter, Christine <[e-mail]>; Raup, Michael <[e-mail]>
Cc: Chao, Ming-tai <[e-mail]>; '[e-mail]' <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report
2

Please see the attached hydrogeologic cross sections, per your request. Thank you.

Please take note:
After Sept 11, my corporate email address will change: [e-mail]
All other contact info will remain the same. Thank you.

G. David Garrett, P.G., P.E.
Senior Engineer
Amec Foster Wheeler Environment & Infrastructure, Inc.
4021 Stirrup Creek Drive – Suite 100
Durham, North Carolina 27703
[e-mail]

Phone: [phone]
Direct line: 919-765-0070
Cell: 919-418-4375

From: Ritter, Christine [mailto:[e-mail]]
Sent: Friday, August 25, 2017 11:30 AM
To: Garrett, David <[e-mail]>; Raup, Michael <[e-mail]>
Cc: Chao, Ming-tai <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

I have reviewed the Construction Quality Assurance Documentation submitted for A-1 Sandrock CDLF Phase
2B. Because the Amended Design Hydrogeologic contains new information collected since the latest approved Design
Hydro Report, please construct new stratigraphic cross-section drawings reflecting the most current hydrogeological
conditions at Phase 2B including: 1) the current base grade elevations at Area Phase 2B; 2) the top of bedrock and
overlying geology/stratigraphy beneath Phase 2B using historical boring, piezometer, test pit, and/or groundwater
monitoring well data; and 3) elevation of estimation long-term seasonal high groundwater table.

Thank you,

Christine Ritter
Hydrogeologist
Solid Waste Section
Division of Waste Management
NC Dept of Environmental Quality

919 707 8254 office
[e-mail]

Mailing address:
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Physical address:
217 West Jones Street
Raleigh, NC 27603

3

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

From: Chao, Ming-tai
Sent: Wednesday, August 16, 2017 12:12 PM
To: Garrett, David <[e-mail]>; Raup, Michael <[e-mail]>
Cc: Mussler, Ed <[e-mail]>; Ritter, Christine <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

Gentlemen:

The Solid Waste Section (SWS) received the CQA report for A-1 Sandrock CDLF – Phase 2B; this document
was scanned and uploaded to the Laserfiche with a DIN 28401. The SWS will review the document shortly.

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: Mussler, Ed
Sent: Wednesday, August 16, 2017 11:24 AM
To: Chao, Ming-tai <[e-mail]>
Subject: FW: A-1 Sandrock CQCD Report

4

From: Raup, Michael [mailto:[e-mail]]
Sent: Monday, August 07, 2017 12:21 PM
To: Mussler, Ed <[e-mail]>
Cc: Garrett, David <[e-mail]>
Subject: A-1 Sandrock CQCD Report

Mr. Mussler,

Please find the attached CQCD Report for A-1 Sandrock Inc., CDLF.

Michael Raup, P.E.
Geotechnical Engineer, Amec Foster Wheeler Environment & Infrastructure
4021 Stirrup Creek Drive – Suite 100, Durham, North Carolina 27703, USA
T +01 919 381 9343 M +01 423 943 1038
[e-mail] amecfw.com

This message is the property of Amec Foster Wheeler plc and/or its subsidiaries and/or affiliates and is intended only for the named
recipient(s). Its contents (including any attachments) may be confidential, legally privileged or otherwise protected from disclosure by
law. Unauthorised use, copying, distribution or disclosure of any of it may be unlawful and is strictly prohibited. We assume no
responsibility to persons other than the intended named recipient(s) and do not accept liability for any errors or omissions which are a
result of email transmission. If you have received this message in error, please notify us immediately by reply email to the sender and
confirm that the original message and any attachments and copies have been destroyed and deleted from your system. If you do not
wish to receive future unsolicited commercial electronic messages from us, please forward this email to: [e-mail]
and include “Unsubscribe” in the subject line. If applicable, you will continue to receive invoices, project communications and
similar factual, non-commercial electronic communications.

Please click http://amecfw.com/email-disclaimer for notices and company information in relation to emails originating in the UK, Italy or
France.
B-24B-25B-16
B-7
MW-4
B-14
MW-1
B-8
B-13
B-15
MW-3
1
Chao, Ming-tai
From:Garrett, David <[e-mail]>
Sent:Tuesday, September 05, 2017 2:51 PM
To:Chao, Ming-tai; Raup, Michael; '[e-mail]'
Cc:Mussler, Ed; Rice, Sarah M
Subject:RE: A-1 Sandrock CQCD Report
Attachments:Response to SWS emails 9-5-2017.pdf
Please see the attached Financial Assurance calculations. Thank you.

Please take note:
After Sept 11, my corporate email address will change: [e-mail]
All other contact info will remain the same. Thank you.

G. David Garrett, P.G., P.E.
Senior Engineer
Amec Foster Wheeler Environment & Infrastructure, Inc.
4021 Stirrup Creek Drive – Suite 100
Durham, North Carolina 27703
[e-mail]

Phone: [phone]
Direct line: 919-765-0070
Cell: 919-418-4375

From: Chao, Ming-tai [mailto:[e-mail]]
Sent: Wednesday, August 16, 2017 1:03 PM
To: Garrett, David <[e-mail]>; Raup, Michael <[e-mail]>;
'[e-mail]' <[e-mail]>
Cc: Mussler, Ed <[e-mail]>; Rice, Sarah M <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

Gentlemen:

After conducting a quick research of the financial assurance/cost estimates for closure and post closure in the
approved PTC -Phases 2 Application (DIN 24958) for A-1 Sandrock CDLF, I found out the PTC application
only covered required costs for Phase 1 & Phase 2A, approximately 12.58 acres. The costs for closure and post-
closure cares of Phase 2B (with waste footprint about 3.42 acres) is not included in the approved PTC
document. Please prepare and submit the update Closure & Post-Closure Plan including cost estimates plus
annual inflation adjustment & 1 million dollar PACA. The new FA mechanism to cover the costs over 16-acre
Phases1 & 2 must be submitted to the Solid Waste Section for a review and approval prior to issuance of new
PTO for Phases 2B.

Thank you for your cooperation on this matter.

Ming Chao
2
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: Chao, Ming-tai
Sent: Wednesday, August 16, 2017 12:12 PM
To: 'Garrett, David' <[e-mail]>; Raup, Michael <[e-mail]>
Cc: Mussler, Ed <[e-mail]>; Ritter, Christine <[e-mail]>
Subject: RE: A-1 Sandrock CQCD Report

Gentlemen:

The Solid Waste Section (SWS) received the CQA report for A-1 Sandrock CDLF – Phase 2B; this document
was scanned and uploaded to the Laserfiche with a DIN 28401. The SWS will review the document shortly.

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.

3

From: Mussler, Ed
Sent: Wednesday, August 16, 2017 11:24 AM
To: Chao, Ming-tai <[e-mail]>
Subject: FW: A-1 Sandrock CQCD Report

From: Raup, Michael [mailto:[e-mail]]
Sent: Monday, August 07, 2017 12:21 PM
To: Mussler, Ed <[e-mail]>
Cc: Garrett, David <[e-mail]>
Subject: A-1 Sandrock CQCD Report

Mr. Mussler,

Please find the attached CQCD Report for A-1 Sandrock Inc., CDLF.

Michael Raup, P.E.
Geotechnical Engineer, Amec Foster Wheeler Environment & Infrastructure
4021 Stirrup Creek Drive – Suite 100, Durham, North Carolina 27703, USA
T +01 919 381 9343 M +01 423 943 1038
[e-mail] amecfw.com

This message is the property of Amec Foster Wheeler plc and/or its subsidiaries and/or affiliates and is intended only for the named
recipient(s). Its contents (including any attachments) may be confidential, legally privileged or otherwise protected from disclosure by
law. Unauthorised use, copying, distribution or disclosure of any of it may be unlawful and is strictly prohibited. We assume no
responsibility to persons other than the intended named recipient(s) and do not accept liability for any errors or omissions which are a
result of email transmission. If you have received this message in error, please notify us immediately by reply email to the sender and
confirm that the original message and any attachments and copies have been destroyed and deleted from your system. If you do not
wish to receive future unsolicited commercial electronic messages from us, please forward this email to: [e-mail]
and include “Unsubscribe” in the subject line. If applicable, you will continue to receive invoices, project communications and
similar factual, non-commercial electronic communications.

Please click http://amecfw.com/email-disclaimer for notices and company information in relation to emails originating in the UK, Italy or
France.
MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Facility Plan Page 5
PERMITTED CAPACITY A-1 Sandrock, Inc., CDLF (Permit #41-17)
CDLF Phases/Sub-Phases 1 1A (Built) 1B (Built) 1C (Built)
Approved Footprint Acreage 1 2.54 ac 3.18 ac 2.46 ac >>> 8.18 ac
Interim Capacities (Sub-Phases) 2 62,370 cy 186,242 cy 221,720 cy >>> 470,332 cy
Interim Elevations (Sub-Phases) EL. 810 EL. 830 EL. 840
New CDLF Phases/Sub-Phases 1 2A (Built) 2B (Pending) 3 4
Approved Footprint Acreage, 1 ac 4.40 3.42 5.89 0
Interim Capacities (Sub-Phases), 2 cy 250,383 357,810 647,787 505,536
Interim Elevations (Sub-Phases) EL. 846 EL. 846 EL. 854 EL. 904
Volumetric Capacity (Phase 2 only) ........................................................................ 608,193 cy
Permitted Disposal Acreage (Phases 1&2) .............................................................. 16.00 acres
Permitted Capacity (Phases 1&2) 3 .......................................................................... 1,078,524 cy
Original Approved CDLF Footprint Acreage ......................................................... 21.89 acres
Original Approved Total Capacity (Phases 1-4) 2 .................................................... 2,240,000 cy
Operational Life Expectancy .................................................................................... 20 - 25 years
1 Corresponding to 5-year Operating Capacity
2 Includes Final Cap System and Operational Cover
3 This is what is now permitted pending approval of the Phase 2B PTO

REVISED CAPACITY A-1 Sandrock, Inc., CDLF (Permit #41-17)
CDLF Phases/Sub-Phases 1 1 (Built) 2 (Pending) 3 (Future) 4 4
Approved Footprint Acreage 1 8.18 ac 7.82 ac 5.89 0 3
Interim Capacities (Sub-Phases) 2 470,332 cy 608,192 cy 647,787 <505,536>
Interim Elevations (Sub-Phases) EL. 840 EL. 846 EL. 854 EL. 904
Vertical Expansion/Sub-Phases 1 Stage 1 (under Review)
New Ground Footprint Acreage, 1 ac 0 3
Interim Capacities (Sub-Phases), 2 cy 446,200 cy
Interim Elevations (Sub-Phases) EL. 930
Permitted Disposal Acreage (Phases 1 – 2 Expansion) ........................................... 16.00 acres
Estimated Capacity (Phases 1&2 + Stage 1 Expansion) ......................................... 1,524,727 cy
Estimated Capacity (Phases 1-3 + Stage 1 Expansion) ........................................... 2,172,511
Approved CDLF Footprint Acreage ........................................................................ 21.89 acres
Approved Total Capacity (Phases 1-4) 2 .................................................................. 2,240,000 cy
Operational Life Expectancy .................................................................................... 25 - 30 years 5
1 Corresponding to 5-year Operating Capacity
2 Includes Final Cap System and Operational Cover
3 Vertical Expansion – not actual ground disturbance (does not add to total footprint area)
4 Subtract this volume to keep the total volume with the Stage 1 Expansion within the original permit volume
5 Time counted from beginning of the facility in 2009; the Stage 1 Expansion is projected to add 5 years
MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Closure/Post-Closure Page 77
require excelsior or turf-reinforcement mat (TRM), as specified in the Channel Schedule.
Alternative erosion control products may be substituted with the engineer’s consent.
Rolled erosion control materials should be installed according to the generalized layout
and staking plan found in the Construction Plans or the manufacturer’s recommendations.

Irrigation for landfill covers is not a typical procedure, but consideration to temporary
irrigation may be considered if dry weather conditions prevail during or after the planting.
Care should be taken not to over-irrigate in order to prevent erosion. Collected storm water
will be suitable for irrigation water. Maintenance of the final cover vegetation, described
in the Post-Closure Plan (see below), is critical to the overall performance of the cover.

8.2.1.6 Documentation – The Owner shall complete an “as-built” survey to depict final
elevations of each final cover layer, i.e., top of the intermediate cover layer, top of the
compacted soil barrier, and top of the vegetated soil layer, along with construction narrative
to document any problems, amendments or deviations from the plan drawings. Records of
all testing, including maps with test locations, shall be prepared by the third-party CQA
testing firm. All materials pertaining to the closure shall be placed in the Operational
Record for the facility. Whereas the closure will be incremental, special attention shall be
given to keeping the closure records separate from the normal operational records.

8.2.2 Maximum Area/Volume Subject to Closure
The largest anticipated area that will require final closure at any one time within the next
5-year period – including all of Phase 1 and half of Phase 2 is 11.6 acres. Intermediate
cover shall be used on areas that have achieved final elevations until the final cover is
installed. An annual adjustment is required by the Division for the open area (and the bond
requirement). Based on the volumetric analysis (Appendix 1), the volume of Phase 1 and
half of Phase 2 is 782,580 cubic yards (Section 1.3).

8.2.3 Closure Schedule
Refer to the requirements outlined in Section 8.1.5 (above).

8.2.4 Closure Cost Estimate
The following cost estimate is considered suitable for the Financial Assurance
requirements (see Section 10.0). The Owner intends to build the second half of Phase 2,
designated as Phase 2B (Cell 2B), which adds 3.42 acres to the previously permitted 12.58
acre footprint, for a total of 16.00 acres permitted within an approved 22-acre footprint.
No area currently has a certified final cover in place.

MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Closure/Post-Closure Page 78
TABLE 8A
ESTIMATED FINAL CLOSURE COSTS FOR PHASES 1 and 2 (2017 dollars) 1

VSL (topsoil)2 – 16.0 ac 38720 c.y. @ $4 / cubic yard $ 154,880
CSB (barrier)2 – 16.0 ac 44,528 c.y. @ $8 / cubic yard $ 356,224
Establish Vegetation 16.0 acres @ $1,500 per acre $ 24,000
Storm Water Piping 3 400 LF @ $35.00 / LF $ 14,000
Erosion Control Stone 3 18 tons @ $40.00 / ton $ 720
Cap Gas Vents (3/acre) 48 @ $100 ea $ 4,800
Testing and Surveying 4 Estimated 20 percent of above $ 110,925
Contingency Estimated 15 percent of above $ 83,194
Total Construction Cost (if contracted out) $ 748,743

Notes:
1 The calculation is intended to represent likely third-party construction costs for a hired contractor, not the
Owner/Operator, based on knowledge of local construction costs for similar projects. These estimates meet
NCDEQ Division of Waste Management financial assurance requirements; actual costs may be lower for
construction by the Owner/Operator. Final closure work will be performed incrementally, spreading out the
costs over the life of the project.
2 Includes soil work for regulatory requirements of 15A NCAC 13B .0543, i.e., a minimum of 18 inches of
compacted soil barrier (max. permeability of 1 x 10-5 cm/sec) and 18 inches of topsoil (total soil thickness is
36 inches). For the compacted soil barrier, use a shrinkage factor of 15%; costs include surface preparation,
soil procurement and transport costs, soil placement and compaction, machine/equipment costs, fuel costs
3 Conservative estimate based on similar project history; includes materials and installation
4 Includes Construction document and bidding, construction administrative fee, CQA field monitoring and lab
testing, CQA reporting and certification, final survey for as-built drawings, recordation/notation fee

MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Closure/Post-Closure Page 81
TABLE 8B
POST-CLOSURE MONITORING AND MAINTENANCE SCHEDULE

Activity Frequency
Yrs. 1 - 5
Frequency
Yrs. 6-15
Frequency
Yrs. 16-30
General - Inspect access gates, locks, fences, signs,
site security
Quarterly Quarterly Quarterly
Maintain access roads, monitoring well access As needed As needed As needed
Final Cover Systems/Stability - Inspect cap and
slope cover for erosion, sloughing, bare spots in
vegetation, make corrections as needed (1)
Quarterly Semi-
Annually
Annually
Storm Water/Erosion Control Systems - Inspect
drainage swales and sediment basin for erosion,
excess sedimentation (1)
Quarterly Semi-
Annually
Annually
Mow cover vegetation and remove thatch Semi-Annually Annually None (2)
Inspect vegetation cover and remove trees Annually Annually Annually
Landfill Gas Monitoring Quarterly (3) Quarterly (3) Quarterly (3)
Ground Water Monitoring System - Check well
head security, visibility
Semi-Annually Semi-
Annually
Semi-
Annually
Ground Water Monitoring (4) Semi-Annually Semi-
Annually
Semi-
Annually

Notes:
1. Inspect after every major storm event, i.e., 25-year 24-hour design storm
2. Dependent on vegetation type, periodic mowing may be required
3. The Solid Waste Section may be petitioned for discontinuation of gas monitoring if no detections occur in gas
sampling locations or on-site buildings
4. See current Ground Water Sampling and Analysis Plan
MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Closure/Post-Closure Page 82
8.3.2 Responsible Party Contact
Mr. R.E. ‘Gene’ Petty, Sr. – Owner
Mr. Ronnie E. Petty, III – Operator
A-1 Sandrock, Inc.
2091 Bishop Road
Greensboro, NC 27406 Tel. [phone]
8.3.3 Planned Uses of Property
Currently, there is no planned use for the landfill area following closure. The closed facility
will be seeded with grass to prevent erosion. Any post-closure use of the property
considered in the future will not disturb the integrity of the final cover or the function of
the monitoring systems unless necessary (and to be accompanied by repairs or upgrades).
Future uses shall not increase the potential threat to human health and the environment.
8.3.4 Post-Closure Cost Estimate
The following cost estimate is considered representative of post-closure care costs for the
Financial Assurance (see Section 10.0). This calculation includes all of Phase 1 and
Phase 2, totaling 16.0 acres.
TABLE 8C
ESTIMATED POST-CLOSURE COSTS FOR PHASES 1 and 2 (in 2017 dollars)

Annual Events Units Unit
Cost
Cost/
Event
Annual
Costs
Reseeding/mulching and erosion repair
(Assume 5% of 16.0 ac., once per year)
0.80 ac. $1,600 $1,280.00 $1,280.00
Mow final cap (twice per year) 16.0 ac. $25 $400.00 $800.00
Ground Water (semi-annual, 5 wells)* 6 ea. $400 $2400.00 $4800.00
Surface Water (semi-annual, 4 locations)* 4 ea. $350 $1400.00 $2800.00
Water quality analysis and reporting 2 ea. $2250 $4500.00 $4500.00
Landfill Gas Monitoring (quarterly) 4 ea. $500 $2000.00 $2000.00
Engineering inspection (annual basis) 1 ea. $1,500 $1,500.00 $1,500.00
Maintain storm water conveyances 1 ea. $1,000 $1,000.00 $1,000.00
Maintain access roads, gates, buildings 1 ea. $500 $500.00 $500.00
*Appendix I Detection Monitoring
(Section 9.0)
Total Estimated Annual Cost $19,180.00
30 years * $19,180.00 = $575,400.00 (See Section 10)
MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Financial Assurance Page 87
10.0 FINANCIAL ASSURANCE (15A NCAC 13B .0546)

15A NCAC 13B .0546 requires that Owners/Operators demonstrate financial assurance
for closure and post-closure activities. Typically, for local government-owned facilities,
said demonstration is based on a local government test. For private facilities, the posting
of a performance bond or insurance policy is typically acceptable to the Division.

Cost estimates for closure and post-closure of CDLF Phases 1 and 2 are presented in
Sections 8.2.4 and 8.3.4, respectively. The following is a detailed analysis of the closure
and post closure costs, based on the preceding, all in 2017 dollars, projected over the
anticipated life of the landfill and 30 years of post-closure care. The Financial Assurance
obligation should be recalculated for future years to account for inflation using annual
multipliers furnished by NCDENR.

It should be realized that the bond requirement is for the whole landfill that has a Permit to
Operate – the liabilities both increase and decrease with time as phases are opened and
others are closed. Thus, the amount of the post-closure instrument should be adjusted on
an annual basis, consistent with Division policy. Acceptable financial assurance
instruments include performance bonds, insurance policies, cash deposits and irrevocable
letters of credit.

SUMMARY OF CLOSURE AND POST-CLOSURE COST (2017 dollars)

1. Final Closure Construction (see Table 8A) $ 748,743.00

2. Projected Post-Closure Costs (see Table 8C)* $ 575,400

TOTAL CLOSURE/POST-CLOSURE COST $1,324,143.00

3. PACA** $1,000,000

TOTAL REQUIRED FINANCIAL ASSURANCE $2,324,143.00

Per Division rules, Owners/Operators must furnish an acceptable financial assurance
instrument (e.g., performance bond, irrevocable letter of credit, insurance policy, other
fiduciary instrument) within 30 days of notification of approval.
*Assumes 30 years
*Statutory changes enacted ca. 2008 and revised ca. 2010 require a separate bond for Potential Assessment
and Corrective Action, also referred to as PACA. The minimum bond amount is currently $1M.
MSE Wall PTC and Facility Plan Rev 2.0 Amec Foster Wheeler Project No. 6468-17-7032
A-1 Sandrock C&D Landfill (4117-CDLF) Phase 2 September 5, 2017

Plan Certification Page 88
11.0 CERTIFICATION
This engineering plan for the A-1 Sandrock, Inc., C&D Landfill Phases 1 and 2 disposal
unit has been prepared by, or under the responsible charge of, a North Carolina Licensed
Professional Engineer to meet the requirements of 15A NCAC 13B .0539. The individual
signature and seal below attests to compliance with this rule requirement.

Signed ______________________
Printed G. David Garrett .
Date September 5, 2017 .

Not valid without the seal of the above-named licensed professional.

Correspondence:
Amec Foster Wheeler Environment & Infrastructure, Inc.
4021 Stirrup Creek Drive, Suite 100
Durham, North Carolina 27703
Tel [phone]
Fax [phone]

amecfw.com
August 4, 2017

Mr. Ed Mussler, PE, Branch Head
NCDENR Division of Waste Management
Solid Waste Section Permitting Branch
1646 Mail Service Center
Raleigh, NC 27699-1646

Subject: Construction Quality Assurance Documentation
A-1 Sandrock CDLF Phase 2B
Greensboro, North Carolina (Guilford County)
Solid Waste Permit 4117-CDLF-2008

Dear Mr. Mussler:

Amec Foster Wheeler Environment & Infrastructure, Inc. (Amec Foster Wheeler) is pleased to
present this report on behalf of A-1 Sandrock, Inc., documenting the completion of Phase 2B of
the approved CDLF expansion. This work was completed in pursuit of the Permit to Construct
(PTC) issued by the Solid Waste Section (SWS) on September 11, 2015 (DIN 24959). Within this
report, please find documentation for construction of Phase 2B, including the certification of a
subgrade conditions and adherence to the approved construction plan. At this time A-1 Sandrock
CDLF seeks the Section’s approval of the construction and the issuance of a Permit to Operate
(PTO) for a five-year period.

This report is organized into the following sections.

1. Letter Report
2. Appendices
A. As-built construction drawings
B. Test pits to confirm ground water separation and bedrock
C. Design Hydrogeologic Report Amendment
D. CQA meeting minutes and notes
E. Photographic documentation
F. Facility Plan Drawing Showing Modification to Mulch Storage
G. Reserved

A-1 Sandrock, Inc., CDLF (Solid Waste Permit 41-17) August 4, 2017
Phase 2B CQA Documentation and PTO Application Page 2
OVERVIEW

This report is intended to satisfy the requirements of 15A NCAC 13B.0540 for documentation of
a Construction Quality Assurance (CQA) program for Phase 2B at A-1 Sandrock CDLF. Phase
2B is a contiguous footprint covering approximately 3.42 acres, with the older CDLF (Phase 2A).
Construction was divided into two equal sub-phases: Phase 2B-1 (Cell 1) in the higher elevations
to the east and Phase 2B-2 (Cell 2) in the lower elevations to the west.

Phase 2B is located in a balanced earthwork section with grades approved under an earlier report.
The upper 24 inches of the soil was consisted of USCS classifications of mostly ML and SM, with
some CL based on visual inspection of the Phase 2B construction. Soil classification was
performed via 9 tests pits dug across Phase 2B-1 and 2B-2 by A-1 Sandrock.

Amec Foster Wheeler is of the opinion, based on prior testing and experience, that visual
classifications are sufficient to characterize these soils. The compaction and soil characteristics
are consistent with those observed in Phase 1 and Phase 2A. The performance of the soils under
load were confirmed via proof rolling to evaluate the soil density; a large piece of excavating
equipment (track excavator) moved across the site with no indications of soft or pumping soil
conditions. These methods are used extensively in the construction industry and are appropriate
for this site.

Major aspects of the new construction included:

1. Establish layout and grade control for construction using a third-party licensed surveyor;
install permanent marker posts at the perimeter of the waste footprint. (See drawings,
Appendix A)

2. Verification that fill within the upper 24 inches of finished base grades meets current NC
DENR Solid Waste Section requirements for soil type. (See test pit logs, Appendix B)

3. Final grade elevations meet four foot separation requirements with regards to ground
water and bedrock.

4. Address puddling of surface runoff from weather events to ensure proper drainage from
phase.

RESPONSIBILITIES AND DOCUMENTATION

The Facility served as its own contractor (facility manager Ronnie Petty supervising) using in
house staff and equipment, local surveying support (Allied Professional Services, PLLC, Clint
Osborn, PLS surveyor), and field engineering support and CQA oversight (Amec Foster Wheeler,
Michael Raup, PE supervising). Documentation of the work consists of field notes and "as-built"
construction plans, plus a series of photographs, presented in separate sections of this report.
(See Appendices)
A-1 Sandrock, Inc., CDLF (Solid Waste Permit 41-17) August 7, 2017
Phase 2B CQA Documentation and PTO Application Page 3

Based on our familiarity with the facility and soils within the upper 24 inches, the project engineer
was able to base the subgrade characterization on visual soil classifications and performance-
based compaction criteria. Soils are well understood from the permitting and earlier construction.
As a provision of Section 4.2.1 of the PTC Application, visual examination was used in lieu of
laboratory testing. All soil work passed the visual evaluation criteria.

While inspecting the test pits and capturing photographs of the phase it was apparent that
between phases 2A and 2B was a remnant of the original soil above the design grade was left in
place. These surfaces show a relict rock-like texture, but the test pits confirmed that the materials
did not contain bedrock within a depth of 4 feet beneath finished base grades. This material was
excavatable using conventional excavating equipment, and visually classified as weathered rock.

CERTIFICATION

This is to certify that construction of Phase 2B of the A-1 Sandrock CDLF was completed in
substantial compliance with (1) the CQA Plan, (2) the conditions of the Permit to Construct (3) the
Solid Waste Management Rules, and (4) approved grades, as depicted on the “as-built” plans.
Said plans were prepared based on a topographic survey by a licensed surveyor. Subgrade soil
types meet the current regulatory requirements based on visual inspection. No ground water,
detrimental soils, or bedrock were encountered at or above the approved subgrade elevations;
site conditions are as anticipated and consistent based on the earlier permitting studies.

Please contact us if you have any questions or comments.

Cordially yours,
Amec Foster Wheeler Environment & Infrastructure

Michael C. Raup, P.E. G. David Garrett, P.G., P.E.
Geotechnical Engineer Senior Engineer
NC – PE 45271 NC – PG 0983
NC – PE 25462

Appendix A – As-Built Construction Drawings

AMEC Foster Wheeler Environment & Infrastructure, Inc.
4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM, NORTH CAROLINA
TEST PIT LOCATION PLAN A1 SANDROCK PHASE 2B
GREENSBORO, NORTH CAROLINA
DRAWN: CO DATE: JULY 2017 FIGURE
ENG CHECK:
MCR
SCALE:
NTS 1APPROVAL: GDG JOB NO.: 6468-17-7032
Reference: CLINT OSBORN ALLIED ASSOCIATES, P.A.
AMEC Foster Wheeler Environment & Infrastructure, Inc.
4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM, NORTH CAROLINA
BASE GRADE VARIATIONA1 SANDROCK PHASE 2B
GREENSBORO, NORTH CAROLINA
DRAWN: CO DATE: JULY 2017 FIGURE
ENG CHECK:
MCR
SCALE:
NTS 2APPROVAL: GDG JOB NO.: 6468-17-7032
Reference: CLINT OSBORN ALLIED ASSOCIATES, P.A.
AMEC Foster Wheeler Environment & Infrastructure, Inc.
4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM, NORTH CAROLINA
GROUNDWATER SEPARATIONA1 SANDROCK PHASE 2B
GREENSBORO, NORTH CAROLINA
DRAWN: CO DATE: JULY 2017 FIGURE
ENG CHECK:
MCR
SCALE:
NTS 3APPROVAL: GDG JOB NO.: 6468-17-7032
Reference: CLINT OSBORN ALLIED ASSOCIATES, P.A.
AMEC Foster Wheeler Environment & Infrastructure, Inc.
4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM, NORTH CAROLINA
BEDROCK SEPARATIONA1 SANDROCK PHASE 2B
GREENSBORO, NORTH CAROLINA
DRAWN: CO DATE: JULY 2017 FIGURE
ENG CHECK:
MCR
SCALE:
NTS 4APPROVAL: GDG JOB NO.: 6468-17-7032
Reference: CLINT OSBORN ALLIED ASSOCIATES, P.A.
AMEC Foster Wheeler Environment & Infrastructure, Inc.
4021 STIRRUP CREEK DRIVE, SUITE 100 DURHAM, NORTH CAROLINA
PIEZOMETER ABANDONMENTA1 SANDROCK PHASE 2B
GREENSBORO, NORTH CAROLINA
DRAWN: CO DATE: JULY 2017 FIGURE
ENG CHECK:
MCR
SCALE:
NTS 5APPROVAL: GDG JOB NO.: 6468-17-7032
Reference: CLINT OSBORN ALLIED ASSOCIATES, P.A.

Appendix B – Test Pit Logs and Photographs

Photo 1
Test Pit 1
Depth – 5.2’
Water Depth – Dry
Visual Soil Classification – Reddish Orange, SILT (ML)

Photo 2
Test Pit 2
Depth – 4.4’
Water Depth – Dry
Visual Soil Classification – Tan Brown, Sandy SILT (ML)

Photo 3
Test Pit 3
Depth – 4.7’
Water Depth – Dry
Visual Soil Classification –Brown, Sandy SILT (ML)

Photo 4
Test Pit 4
Depth – 5.7’
Water Depth – Dry
Visual Soil Classification – Tan, Sandy SILT (ML)

Photo 5
Test Pit 5
Depth – 4.6’
Water Depth – Dry
Visual Soil Classification – Brown, Sandy SILT (ML)

Photo 6
Test Pit 6
Depth – 4.2’
Water Depth – Dry
Visual Soil Classification – Tan, Sandy SILT (ML)

Photo 7
Test Pit 7
Depth – 5.0’
Water Depth – 0.4’
Visual Soil Classification – Tan, Sandy SILT (ML)

Photo 8
Test Pit 8
Depth – 4.9’
Water Depth – 0.3’
Visual Soil Classification – Tan Brown, Sandy SILT (ML)

Test Pit 9
Depth – 5.0’
Water Depth – Dry
Visual Soil Classification – Tan Brown, Sandy SILT (ML)
and Gray, Lean CLAY (CL)

Appendix C – Design Hydrogeologic
Report Amendment

A-1 Sandrock, Inc., CDLF (Solid Waste Permit 41-17) August 4, 2017
Phase 2 Design Hydrogeologic Study Amendment Page 1

1. Historical Perspective

A-1 Sandrock submitted a Design Hydrogeologic report for Phase 2 in May 2015 (DIN 24835),
approved September 4, 2015 (DIN 24941). That report correlated new test pits performed after
the mining activities to original data from the Site Suitability study; this study focused on Phase
2A, with the understanding that similar future study would be necessary for Phase 2B. The 2015
study revealed 1) water conditions shallower than originally anticipated in the lower elevations of
Phase 2A, and 2) rock-like materials that were softer and easier to excavate with conventional
earthwork techniques that indicated in the Site Suitability study in the higher elevations.

Unfavorable drainage conditions during the excavation lead to base grade geometry that allowed
the accumulation of surface water in the “sump” area of Phase 2A, resulting in saturation of the
subgrade soils at the original base grade elevations. Wet conditions prevailed during the months
leading up to the Phase 2A evaluation, but it could not be ascertained whether the soil saturation
reflected true ground water or “perched” water conditions exacerbated by the permeability soils.
A-1 raised the base grades in Phase 2A up to 4 feet to mitigate these conditions. A topographic
survey was prepared for as-built base grades, and test pits confirmed that adequate vertical
separation was present between the revised base grades and either groundwater or bedrock.

2. Recent Study of Phase 2B

Nearly identical conditions existed in Phase 2B, as anticipated. Mining to near proposed base
grades during 2016 and early 2017 encountered similar conditions with respect to shallow water
on the west side, softer materials on the east side than indicated earlier by “auger refusal” in the
Site Suitability report. Appendix A of this work presents four drawings, numbered Figures 1-4,
which detail the findings test pit investigation of Phase 2B. Appendix B presents photos of each
test pit showing a tape measure for depth reference. The June 23, 2017 Technical Memorandum
(CQA minutes) includes three photos, labelled Figures 1-3. The following section (Findings) will
reference these photos, as well as the Phase 2A photos presented in the June 2015 report.

3. Findings of Phase 2B Study

Figure 1 in this work documents the as-built base grade and shows test pit locations that confirm
the required vertical separation. Appendix E presents photos that depict Phase 2B grading near
the completion. The diabase dike described in the Site Suitability report and the Phase 2 Design
Hydrogeologic report was encountered in the mid-elevations (north side) of Phase 2B. The dike
exhibited rounded nodules varying from cobble-size to small boulders at the surface and
extending 10 to 15 feet below the original ground surface. Below these depths, the dike became
less weathered and transitioned to a chunky, friable rock-like material that was excavated using
conventional track-mounted excavators. These conditions are similar to those described in the
Phase 2 Design Hydrogeologic report. In the earlier site studies, the dike was estimated to be 50
feet wide at the surface. The Phase 2B construction revealed the dike widens with depth.
A-1 Sandrock, Inc., CDLF (Solid Waste Permit 41-17) August 4, 2017
Phase 2 Design Hydrogeologic Study Amendment Page 2

In the June 23, 2017 memorandum (see Appendix D), Figure 1 (photo) shows the northern end
of Phase 2B looking west. The dark-color, chunky diabase is visible in the cut slope to the right
side of the photo. The location of the diabase coincides with the dark red soil and chunky diabase
shown in photos in the Phase 2 Design Hydrogeologic report. These locations are exactly where
the diabase was expected, based on the Site Suitability report. However, boulders and/or local
variations in density appear to have caused “auger refusal” conditions at depths shallower than
A-1 was able to excavate. As such, the chunky material is not true bedrock; rather it is a less
weathered form of the saprolite overlying the diabase bedrock.

In the June 23, 2017 memorandum (see Appendix D), Figures 2 and 3 (photos) show water
accumulated in the Phase 2B sump. A-1 removed the water pumping during the course of the
Phase 2B investigation, over a several week period. The winter and spring leading up to the
preparation of Phase 2B were very wet, and a lot of water accumulated in the sump. However,
once pumped down the water did not recharge (without additional rainfall), thus Amec Foster
Wheeler believes that the saturated subgrade conditions observed prior to digging the test pits is
“perched.” In the interest of time, A-1 decided to raise the base grade in the sump to provide the
required 4 feet of vertical separation.

Figure 2 in this work presents an isopach map depicting the difference in grades between the as-
built topography and the original design base grades (dating back to the Site Suitability report).
The isopachs show thickness contours of the grade differences, denoted as “High” and “Low” as
appropriate. Within the northwest portion of Phase 2B, the “sump,” as-built base grades typically
vary from 2 to 4 feet higher than the original design grades. Areas within the northeast portion
of Phase 2B vary from 2 to 6 feet lower than design grades. Amec Foster Wheeler evaluated
these areas during the excavation work and recommended a minimum of 4 feet of soil “padding”
to be placed above the excavated surfaces. Test pits presented in Appendix B showed the water
levels were more than 4 feet below finished base grades.

Within the south portion of Phase 2B, the excavation encountered harder materials at the depths
anticipated based on the Site Suitability data, thus these areas are left at, or slightly higher, than
design grades. Along the west portion of the slope, including the area above the sump, the
isopachs show the ground to be 4 to 6 feet lower than design grades. This is due to scraping the
perimeter “berm” (actually a cut slope in native Sandrock) to remove vegetation. A continuous
ditch occurs along the inside perimeter of the roadway, to convey surface water from higher
elevations without flooding Phase 2B. This area is sufficiently strong to resist the weight of the
future wastes without sliding or overturning, in the opinion of the engineer. Historically, the
engineer has tracked variations from the design base grades in Phases 1 and 2 to confirm that
the airspace is staying within the permitted volumes.

Figure 3 in this work depicts ground water contours derived in part from those original contours
found in the Site Suitability report, modified with information developed in the Phase 2 Design
Hydrologic report and this investigation of Phase 2B. The contours reflect the maximum probable
A-1 Sandrock, Inc., CDLF (Solid Waste Permit 41-17) August 4, 2017
Phase 2 Design Hydrogeologic Study Amendment Page 3

ground water elevations within Phase 2B based on the test pit data, summarized in the figure.
Most of the test pits are dry, except TP-7 and TP-8, which encountered water deeper than 4 feet
below the as-built grades in the sump area. All the test pits went deeper than 4 feet below as-
built grades. The ground water contours are the assumed maximum water levels that could exist
under these conditions, i.e., maximum surface exposure (high infiltration) and wet prevailing
climate. Figure 3 shows that the minimum vertical separation requirement has been met.

Figure 4 in this work depicts bedrock contours derived in part from those original contours found
in the Site Suitability report, modified with information developed in the Phase 2 Design Hydrologic
report and this investigation of Phase 2B. Historically, data at this site (and others) show a
transitional nature in the change from soil to rock, whereas the soils become progressively denser
with increasing depth and gradually transition to rock. Engineers and geologists use the term
“saprolite” for this transition zone, which can include dense soil with a relict rock-like texture and
materials exhibiting variable density, termed “partially weathered rock” or “PWR” by the local
engineering community. The PWR forms along joints and other fractures in the rock, and can
extend many feet deeper than “auger refusal” conditions. The top of “bedrock” can vary across
the site and may result in excavations that extend deeper than originally anticipated. Whereas
the test pits encountered no bedrock, the contours in Figure 4 depict the highest theoretically
possible bedrock contours, assuming the bedrock exists just beneath the bottoms of the test pits.
Figure 4 shows that the minimum vertical separation requirement has been met.

4. Piezometer Abandonment

Figure 5 shows three borings within the Phase 2B footprint, B-15, B-18 and B-25, and one on the
boundary with Phase 2A, B-29. The latter boring was abandoned with Phase 2A. Of the three in
Phase 2B, two were dry, B-15 and B-25. A piezometer pipe was installed in B-15, but no water
was ever recorded. No piezometer was installed at B-25. At B-18, records show a piezometer
was installed in Unit 1, the saprolite overlying the granite, also known as “Sandrock.” The water
level was recorded at approximately El. 760. Hydraulic conductivity at B-18 was 1 x 10-6 cm/sec
measured using slug tests. Current base grades at the location of B-18 are 11 feet below the
original ground surface. However, the boring terminated at a depth of 29 feet and, thus, it is likely
that the Sandrock excavation removed the piezometer at B-18, and at B-15. However, there is
no documentation of this occurrence. Site personnel were questioned, but none have recollection
of even seeing the piezometers, but there has been some staff turnover.

5. Conclusions

Drawings presented as Figures 1-4 (Appendix A of this work) depict the currently understood
conditions for base grades, ground water and bedrock, modified from earlier work. Groundwater
and bedrock surfaces vary somewhat from the earlier study, i.e., the Site Suitability report, but
these conditions are nearly identical to those described in the Phase 2 Design Hydrogeologic
report and encountered in Phase 2A. The test pit logs (Appendix B of this work) confirm the
A-1 Sandrock, Inc., CDLF (Solid Waste Permit 41-17) August 4, 2017
Phase 2 Design Hydrogeologic Study Amendment Page 4

presence of 4 feet of vertical separation between as-built base grades and either groundwater or
bedrock. Materials encountered in the excavation are as expected with respect to composition
and density. Where possible, the as-built base grades are lower than original design grades (from
the Site Suitability report), while maintaining the required vertical separation. This work, as an
amendment to the Phase 2 Design Hydrogeologic study, confirms conditions as nearly identical
in both Phases 2A and 2B. The lack of a piezometer abandonment record for B-15 and B-18 is
not considered harmful to ground water resources, whereas neither boring penetrated the bedrock
and low permeability soils were indicated by earlier field work. No changes to the ground water
or landfill gas monitoring programs are warranted.

6. Certification

This report represents a true representation of the hydrogeologic conditions for the Phase 2B
area of A-1 Sandrock, Inc. CDLF, as presently understood by Amec Foster Wheeler. This
document was prepared in support of a Permit to Operate application for the same. All work was
performed by, or under the supervision of, a North Carolina licensed professional geologist.

Appendix D – CQA Meeting Minutes

Correspondence:
Amec Foster Wheeler Environment and Infrastructure, Inc.
4021 Stirrup Creek Drive, Suite 100
Durham, North Carolina 27703
Tel [phone]
Fax [phone]

amecfw.com
July 17, 2017

TECHNICAL MEMORANDUM

TO: Project Number 6468-17-7032

FROM: Michael Raup – Amec Foster Wheeler Environment & Infrastructure

RE: CQA Progress Meeting Summary
A1Sandrock, CDLF Phase 2B
Greensboro, North Carolina (Guilford County)
Solid Waste Permit 4117-CDLF-2008

The following is a transcription of field notes pertaining to various Construction Quality Assurance
(CQA) inspections and meetings for the referenced work site prepared by Michael Raup of Amec
Foster Wheeler Environment and Infrastructure. The work consists of site inspections and soil
evaluation to meet North Carolina Solid Waste Rules. The work was substantially completed by
the A1 Sandrock CDLF, staff, with partial oversight provided by Michael Raup, P.E. and grade
control by Allied Professional Services, PLLC.

The following notes are arranged by date of my inspections, i.e., minutes of the CQA meetings,
which are intended to serve as documentation of the construction and CQA oversight. Included
with this document are relevant photographs and relevant drawings of "as-built" conditions.
Please be advised that this document shall be presented to the NC DENR Division of Waste
Management in support of forthcoming Permit to Operate application.

A summary of key observations made on the indicated dates of inspection follows:

2/10/17 Amec Foster Wheeler inspected final grading activities and advised client to
confirm grades before preforming test pits. Surveyors had placed grade control
stakes and A1 Sandrock was in the process of preparing the phase to final grade
elevations. Amec Foster Wheeler A1 Sandrock agreed to notify Amec Foster
Wheeler once final grades had been achieved so that test pits could be
performed.

6/15/16 Amec Foster Wheeler visited site to inspect P.L.S. grade elevation and perform
test pits. Upon arrival there was a heavy rain event and test pits were
rescheduled. Recommendations given to address puddled water in the lower
depression area of the phase due to weather. Recommendations were made
regarding final grading with respect to drainage before next site visit.

July 17, 2017
Page 2
Page 2

6/22/16 Amec Foster Wheeler visited the site to inspect subgrade and grade elevations.
Recommendations in regards to final grading from previous site visit were made.
Puddled water was still present but improved from previous site. Test pits were
performed 24 hours in advance to allow for ground water levels to stabilize.
Visual classifications of soils was completed to ensure permit requirements were
met, and confirm four foot separation of final grade and water table or bed rock.
This was conducted using 9 test pits placed across Phase 2B phase such that a
good representation of the phase was shown. The lower end of the phase had
some puddled water from previous rain events. The two test pits next to this area
showed four feet or greater separation in grade and water table, confirming
separation requirements had been satisfied. Observations were documented and
photographed.

6/23/17 Michael Raup prepared CQA documentation report.

End of notes.

July 17, 2017
Page 3
Page 3

Figure 1 – View of Phase 2B from haul road looking down towards the bottom of Phase 2B. Test Pit locations are
also shown.

Figure 2 – View of Phase 2B from southern side of phase.

July 17, 2017
Page 4
Page 4

Figure 3 – View from bottom of Phase 2B towards upper southern side of Phase. Puddled water is shown along with
test pits.

Appendix E – Photographic Documentation

Appendix F – Facility Plan Drawing
Showing Modifications to Mulch Storage

Appendix G – Reserved

1
Chao, Ming-tai
From:Chao, Ming-tai
Sent:Wednesday, August 16, 2017 11:26 AM
To:Ritter, Christine
Subject:FW: A-1 Sandrock CQCD Report
Attachments:A1 Sandrock CQCD 8-7-17 reduced.pdf
Enjoy the reading. ☺

Ming

From: Mussler, Ed
Sent: Wednesday, August 16, 2017 11:24 AM
To: Chao, Ming-tai <[e-mail]>
Subject: FW: A-1 Sandrock CQCD Report

From: Raup, Michael [mailto:[e-mail]]
Sent: Monday, August 07, 2017 12:21 PM
To: Mussler, Ed <[e-mail]>
Cc: Garrett, David <[e-mail]>
Subject: A-1 Sandrock CQCD Report

Mr. Mussler,

Please find the attached CQCD Report for A-1 Sandrock Inc., CDLF.

Michael Raup, P.E.
Geotechnical Engineer, Amec Foster Wheeler Environment & Infrastructure
4021 Stirrup Creek Drive – Suite 100, Durham, North Carolina 27703, USA
T +01 919 381 9343 M +01 423 943 1038
[e-mail] amecfw.com

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