HomeMy WebLinkAbout7607_Great OakSubgradeCertificationCell1B_DIN27087_20161128 SCS Engineers, P.C. Environmental Consultants 2520 Whitehall Park Drive 704 504-3107 and Contractors Suite 450 FAX 704 504-3174 Charlotte, NC 28273-3557 www.scsengineers.com
Offices Nationwide
File No. 02215305.02
November 28, 2016
Ms. Christine Ritter
North Carolina Department of Environmental Quality Division of Waste Management
1646 Mail Service Center
Raleigh, NC 27699-1601
Re: Report of Subgrade Inspection and Vertical Separation Certification
Phase I, Cell 1B
Great Oak Landfill
Randleman, North Carolina
Dear Ms. Ritter:
SCS Engineers, PC (SCS), on behalf of Waste Management, Inc., hereby submits this Report of
Subgrade Inspection and Vertical Separation Certification. This Report covers the remainder of
Cell 1B not certified by the Certification Report issued on October 4, 2016. The portion of Cell
1B covered by this report is approximately 6.6 acres (Figure 1). In addition to the October 4 report previously mentioned, two previous reports, dated September 9 and October 4, 2016,
covered Cell 1A.
The following document, prepared by S&ME, Inc., of Charlotte, NC, and dated February 2015,
was reviewed by SCS: Design Hydrogeologic Study, Great Oak Landfill – Phase 1. This document contains information on the geology and hydrogeology of the Facility.
Subgrade Inspection
The following is a summary of the geologic field observations performed by Mr. Michael Cobb,
a licensed geologist, in accordance with the Landfill’s Permit to Construct, No. 7607-MSWLF-
2015, Part I, Condition 7:
• Contractor excavation has revealed rock formations within portions of Cell 1B.
• Contractor has completed most of the required blasting in this area.
• Cambrian Age slate (meta-mudstone) was observed to overlay quartzite.
• Quartz veins were observed in the quartzite bodies that had not yet been blasted, and
remnant pieces of quartz, varying in size from a few inches in length to up to two feet
in length, were visible in areas in which blasting has occurred.
M s . Christine Ritter
November 28 , 2016
Page 2
• Large boulders of quartzite and meta-mudstone (up to several feet in length) were
observed within the northeastern portions of Cell 1B; these boulders are the result of blasting by the contractor and were being removed at the time of the October 20th site visit.
• Material observed in areas in which no blasting had occurred included residuum and
saprolite consistent with the Uwharrie Formation of the Carolina Slate Belt.
• Groundwater was not observed in the subject cell.
The geology of the area of the cell inspected appears to be consistent with the observations and
geologic evaluations documented in the S&ME report cited above. During an October 20, 2016
site inspection, blasting was in progress in the northeastern portions of Cell 1B, and excavation
of previously-blasted material was underway in areas that had previously been blasted.
Blasting was conducted in order to excavate and remove bedrock formations to a depth of at
least 4 feet below the design subgrade elevations. During the October 20th site inspection,
blasting was not yet completed in the portion of Cell 1B covered by this report.
SCS personnel have been on-site full time and have observed the continued removal of material
from the portion of Cell 1B covered by this report. All rock was removed from the subject area
by mid-November, to a depth that meets the 4-ft requirement for vertical separation. No rock
outcrops jutting above the existing grade established by the contractor were observed. It is
SCS’s opinion that the remaining geologic features in this portion of Cell 1B (that is, the bedrock remaining after blasting and excavation conducted by the contractor) will have no impact on the
construction or operation of the Facility beyond the vertical separation requirements discussed
below.
Vertical Separation Certification
Per 15A NCAC 13B.1624(b)(4), for municipal solid waste landfills, the bottom elevation of the base liner system must have a minimum vertical separation of four (4) feet above bedrock.
Upon completion of blasting and clearing by the contractor, Charlie Morgan Surveying, PLLC
(Morgan) was retained to survey points along the exposed bedrock in the portion of Cell 1B
covered by this report. The survey data provided by Morgan was used to develop an exposed
bedrock map, attached as Figure 1. This map shows that exposed bedrock was present in approximately 3.0 acres of the portion of Cell 1B covered by this report. Upon completion of
structural fill placement, Morgan surveyed this same set of points to establish the base grade and
determine the separation within this portion of Cell 1B.
The elevations from the surveying were used to prepare Table 1, which shows the amount of
separation at each surveyed point.
M s . Christine Ritter
November 28 , 2016
Page 3
Table 1 – Vertical Separation
Point
Number Northing Easting
Bedrock
Elevation
Subgrade
Elevation
Vertical
Separation
5009 727631.0337 1776550.516 648.58 653.33 4.75
5010 727614.5393 1776579.286 653.59 658.45 4.86
5011 727605.9381 1776609.737 654.69 660.08 5.39
5012 727563.311 1776629.868 656.44 661.59 5.15
5013 727560.8475 1776684.096 658.61 664.21 5.60
5014 727513.4778 1776711.666 657.09 663.43 6.34
5015 727523.6336 1776761.503 659.91 665.53 5.62
5016 727489.2389 1776816.475 660.65 667.04 6.39
9000 727263.6066 1776536.804 623.71 628.94 5.23
9001 727282.3422 1776553.86 625.79 630.55 4.75
9003 727300.6501 1776570.658 628.01 634.56 6.55
9004 727319.159 1776587.4 633.83 638.47 4.64
9005 727302.2824 1776605.911 634.38 639.69 5.31
9006 727283.7923 1776588.925 629.68 635.64 5.96
9007 727265.2691 1776572.144 626.33 631.68 5.35
9008 727248.5847 1776590.863 628.62 632.83 4.22
9010 727266.9661 1776608.197 632.10 636.94 4.84
9011 727285.5772 1776624.426 635.43 640.85 5.42
9012 727268.7858 1776642.83 637.55 643.36 5.81
9013 727250.0936 1776625.817 633.98 639.31 5.33
9014 727231.7379 1776609.153 629.78 636.17 6.39
9015 727214.6295 1776628.033 635.31 639.60 4.29
9017 727233.2563 1776644.603 638.19 642.72 4.53
9018 727252.0118 1776661.359 640.36 645.90 5.54
9019 727235.2303 1776680.117 645.10 649.89 4.79
9020 727216.7907 1776663.823 642.12 646.81 4.69
9022 727199.6607 1776681.338 645.91 651.34 5.43
9023 727217.9253 1776698.103 649.34 653.77 4.44
9024 727201.5541 1776716.957 654.11 660.75 6.64
9033 727236.6292 1776715.151 651.04 656.87 5.83
9034 727253.7136 1776696.802 645.94 652.99 7.05
9035 727270.2581 1776678.232 644.53 649.09 4.56
9036 727287.2985 1776659.902 641.12 646.58 5.46
9037 727303.7624 1776640.957 639.71 644.81 5.10
9038 727320.7382 1776622.815 638.78 643.72 4.94
9039 727337.6266 1776604.345 637.48 642.54 5.06
M s . Christine Ritter
November 28 , 2016
Page 4
Table 1 Continued
Point
Number Northing Easting
Bedrock
Elevation
Subgrade
Elevation
Vertical
Separation
9040 727356.1663 1776621.02 641.57 646.52 4.95
9041 727339.3107 1776639.473 642.44 647.70 5.26
9042 727322.4612 1776657.999 643.55 648.87 5.32
9043 727305.8601 1776676.759 644.94 650.62 5.69
9044 727289.015 1776694.837 646.80 652.23 5.43
9045 727272.1018 1776713.701 647.96 656.01 8.05
9046 727324.006 1776692.953 648.56 654.26 5.70
9047 727340.7713 1776674.47 646.67 652.77 6.11
9048 727358.1282 1776656.451 646.65 651.73 5.08
9049 727374.4938 1776637.797 645.42 650.52 5.10
9050 727391.6482 1776619.267 645.59 651.46 5.88
9051 727408.2429 1776600.91 647.15 652.32 5.17
9052 727425.0875 1776582.508 647.98 653.57 5.59
9053 727441.804 1776563.828 649.09 654.83 5.74
9054 727457.2012 1776510.072 646.40 652.76 6.37
9055 727440.3512 1776528.47 644.27 651.89 7.62
9056 727423.3906 1776546.869 644.57 650.96 6.38
9057 727406.5321 1776565.565 644.51 649.68 5.17
9058 727389.9378 1776583.915 643.18 648.39 5.21
9059 727373.0295 1776602.514 641.76 647.47 5.71
9060 727354.7107 1776585.751 638.13 643.49 5.36
9061 727371.2453 1776567.265 639.24 644.37 5.13
9062 727388.2044 1776548.681 640.62 645.70 5.08
9063 727404.732 1776530.138 640.64 647.02 6.38
9064 727421.7158 1776511.678 641.53 647.93 6.40
9065 727438.4523 1776493.145 643.26 649.70 6.44
9066 727419.7425 1776476.328 640.41 646.61 6.20
9067 727403.4901 1776494.949 637.86 644.93 7.07
9068 727386.4539 1776513.344 636.20 643.11 6.91
9069 727369.5449 1776531.832 635.95 641.73 5.78
9070 727352.4866 1776550.217 635.69 640.35 4.66
9071 727335.7951 1776568.795 634.64 639.41 4.77
9072 727317.2307 1776551.923 628.66 635.41 6.76
9073 727334.1404 1776533.618 630.30 636.46 6.16
9074 727351.0722 1776515.11 631.29 637.81 6.52
9075 727367.9794 1776496.737 633.25 639.21 5.96
M s . Christine Ritter
November 28 , 2016
Page 5
Table 1 Continued
Point
Number Northing Easting
Bedrock
Elevation
Subgrade
Elevation
Vertical
Separation
9076 727384.6745 1776478.137 635.60 641.33 5.73
9077 727401.5678 1776459.555 638.14 643.14 5.00
9078 727383.3657 1776442.779 634.67 639.74 5.07
9079 727366.3276 1776461.361 632.41 637.48 5.07
9080 727349.4359 1776479.651 630.48 635.24 4.76
9081 727332.3755 1776498.116 628.81 633.88 5.07
9082 727315.7988 1776516.32 627.16 632.55 5.39
9083 727298.6542 1776535.028 626.64 631.52 4.88
9084 727280.3371 1776518.228 623.08 629.95 6.87
9085 727297.3082 1776499.98 625.62 630.90 5.28
9086 727314.2471 1776481.445 626.46 631.93 5.47
9087 727330.9098 1776463.04 627.60 633.26 5.66
9088 727347.6564 1776444.459 629.52 634.39 4.87
9089 727364.446 1776425.949 631.30 636.56 5.26
9090 727345.7894 1776408.971 628.91 633.53 4.63
9091 727330.9941 1776427.395 626.94 632.56 5.62
9092 727313.1374 1776448.121 626.94 631.38 4.44
9093 727294.6227 1776464.661 625.12 630.22 5.11
9094 727278.6983 1776482.723 622.24 629.24 7.00
9095 727277.4348 1776448.207 624.51 629.06 4.55
9096 727293.4907 1776428.965 625.13 630.05 4.92
9097 727310.8211 1776411.12 626.39 631.37 4.98
9113 727460.3931 1776580.501 653.64 658.43 4.80
9114 727443.7252 1776599.125 652.43 657.50 5.07
9115 727426.6744 1776617.633 651.02 656.24 5.22
9116 727409.9763 1776635.979 649.65 655.37 5.72
9117 727393.2218 1776654.469 649.21 654.54 5.33
9118 727376.1927 1776673.001 650.38 655.65 5.27
9119 727359.7891 1776691.714 650.83 656.85 6.02
9120 727342.6854 1776710.021 651.72 658.06 6.34
9121 727325.9894 1776728.7 653.56 658.42 4.85
9122 727309.3957 1776747.255 654.36 659.15 4.80
9123 727292.4042 1776765.939 656.57 662.02 5.45
9124 727310.8168 1776782.676 656.79 663.35 6.56
9125 727327.59 1776763.748 655.37 660.10 4.74
9126 727344.5071 1776745.362 654.79 659.60 4.81
M s . Christine Ritter
November 28 , 2016
Page 6
Table 1 Continued
Point
Number Northing Easting
Bedrock
Elevation
Subgrade
Elevation
Vertical
Separation
9127 727361.1478 1776727.283 654.65 659.29 4.64
9128 727378.1484 1776708.706 653.56 658.54 4.98
9129 727394.9647 1776689.777 654.02 658.70 4.68
9130 727411.4939 1776671.395 652.96 658.26 5.30
9131 727428.5083 1776652.895 653.80 658.34 4.54
9132 727445.3067 1776634.38 653.82 658.73 4.91
9133 727462.1559 1776616.122 654.21 659.21 5.00
9134 727478.7503 1776597.247 654.84 659.66 4.82
9135 727255.4607 1776732.036 654.54 659.58 5.04
9136 727273.7421 1776748.899 655.51 659.89 4.38
9137 727290.4319 1776730.351 653.51 658.53 5.02
9138 727307.2291 1776711.426 649.94 655.92 5.98
9147 727329.2893 1776799.158 660.62 665.58 4.96
9148 727346.059 1776780.609 656.19 661.38 5.19
9149 727362.9603 1776762.361 656.05 660.80 4.76
9150 727379.8092 1776743.743 655.66 660.50 4.84
9151 727396.504 1776725.193 655.31 660.19 4.88
9152 727413.3498 1776706.625 654.83 659.86 5.03
9153 727430.1624 1776688.147 654.59 659.52 4.93
9154 727446.9622 1776669.513 654.63 659.73 5.10
9155 727463.6953 1776651.379 654.97 659.96 4.99
9156 727480.2946 1776632.63 655.54 660.41 4.87
9157 727497.2543 1776614.137 655.77 660.91 5.14
9158 727515.8324 1776631.085 656.98 661.83 4.85
9159 727499.1834 1776649.554 656.59 661.36 4.77
9160 727482.3924 1776667.929 656.14 661.13 4.99
9161 727465.3759 1776686.477 655.62 660.91 5.29
9162 727448.7151 1776705.073 655.71 660.76 5.05
9163 727431.8103 1776723.598 656.15 661.08 4.93
9164 727414.9975 1776741.924 656.45 661.41 4.96
9165 727398.1221 1776760.459 656.97 661.72 4.75
9166 727381.5305 1776779.231 657.20 662.04 4.84
9167 727364.4446 1776797.465 657.83 662.64 4.81
9168 727347.8833 1776816.123 661.73 666.80 5.07
9170 727383.0424 1776814.231 658.71 665.81 7.10
9171 727400.0605 1776795.957 658.27 663.27 5.00
M s . Christine Ritter
November 28 , 2016
Page 7
Table 1 Continued
Point
Number Northing Easting
Bedrock
Elevation
Subgrade
Elevation
Vertical
Separation
9172 727416.9977 1776777.422 658.03 662.96 4.93
9173 727433.5392 1776758.832 657.79 662.64 4.85
9174 727450.2254 1776740.53 657.37 662.31 4.94
9175 727467.2241 1776721.992 656.90 661.98 5.08
9176 727485.5397 1776738.723 658.41 663.18 4.77
9177 727468.6106 1776756.978 658.49 663.50 5.01
9178 727452.0521 1776775.586 658.85 663.82 4.97
9179 727435.4176 1776794.35 659.31 664.15 4.84
9180 727418.581 1776813.156 659.44 664.50 5.06
9181 727401.7834 1776831.463 660.19 665.54 5.35
9184 727420.1204 1776848.187 661.71 668.62 6.91
9185 727437.1227 1776829.514 660.79 665.67 4.88
9186 727453.5308 1776810.66 660.49 665.33 4.84
9195 727532.848 1776612.841 656.15 661.19 5.05
9196 727549.3273 1776593.763 655.16 660.09 4.93
9197 727566.0694 1776575.339 654.24 658.98 4.74
9198 727583.141 1776556.967 652.08 657.08 5.00
9199 727599.6115 1776538.319 648.31 653.27 4.96
9200 727575.9676 1776527.173 647.83 652.72 4.89
9201 727564.7725 1776540.428 650.34 655.30 4.96
9202 727547.9675 1776558.654 653.42 658.43 5.01
9203 727531.0937 1776577.26 654.80 659.59 4.79
9204 727514.4828 1776596.035 655.54 660.26 4.72
9205 727495.5423 1776578.566 654.52 659.66 5.14
9206 727512.2088 1776560.063 654.19 658.99 4.80
9207 727529.5666 1776542.299 652.37 657.19 4.82
9208 727546.5555 1776523.702 648.54 653.45 4.91
9209 727555.8287 1776513.889 646.75 651.50 4.76
9210 727527.6036 1776506.375 646.72 651.57 4.85
9211 727510.9821 1776525.401 650.04 655.06 5.02
9212 727493.8002 1776543.462 653.48 658.42 4.94
9213 727477.406 1776562.395 653.79 658.45 4.66
9214 727458.6107 1776544.982 650.99 655.51 4.52
9215 727475.3392 1776526.5 651.55 656.28 4.73
9216 727492.3293 1776508.065 648.55 653.53 4.98
9217 727508.7044 1776489.462 645.19 649.80 4.61
LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD
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LOD
LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LODLOD LOD LOD LOD
6
1
0
620 630 640 650660 670 680 690
6
3
0
6
4
0
700
6
5
0
6
6
0
6
7
0
6
8
0
6
2
0
660 670
9
0
0
0
9
0
0
1
9
0
0
3
9
0
0
4
9
0
0
5
9
0
0
6
9
0
0
7
9
0
0
8
9
0
1
0
9
0
1
1
9
0
1
2
9
0
1
3
9
0
1
4
9
0
1
5
9
0
1
7
9
0
1
8
9
0
1
9
9
0
2
0
9
0
2
2
9
0
2
3
9
0
2
4
9
0
3
3
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0
3
4
9
0
3
5
9
0
3
6
9
0
3
7
9
0
3
8
9
0
3
9
9
0
4
0
9
0
4
1
9
0
4
2
9
0
4
3
9
0
4
4
9
0
4
5
9
0
4
6
9
0
4
7
9
0
4
8
9
0
4
9
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0
5
0
9
0
5
1
9
0
5
2
9
0
5
3
9
0
5
4
9
0
5
5
9
0
5
6
9
0
5
7
9
0
5
8
9
0
5
9
9
0
6
0
9
0
6
1
9
0
6
2
9
0
6
3
9
0
6
4
9
0
6
5
9
0
6
6
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0
6
7
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0
6
8
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0
6
9
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0
7
0
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7
1
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2
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3
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7
4
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6
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1
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1
3
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9
1
3
1
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1
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2
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1
3
3
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1
3
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6
SCS ENGINEERS, PC
2520 WHITEHALL PARK DRIVE, SUITE 450
CHARLOTTE, NORTH CAROLINA 28273
PHONE: (704) 504-3107 FAX: (704) 504-3174
1
1
SUBGRADE/BASEGRADE
VERTICAL SEPARATION CERTIFICATION
GREAT OAK LANDFILL
WASTE MANAGEMENT OF CAROLINAS, INC.CELL 1A & 1B
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