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Home My WebLink AboutAppendix G Mitigation Plan Above-Ground Waste Rock Proposed Mitigation Plan for Above-Ground Waste Rock Pile with Supporting Information Carolina Lithium Project Piedmont Lithium Carolinas, Inc. Gaston County, North Carolina April 2023 Prepared for: Prepared by: Piedmont Lithium Carolinas, Inc. Marshall Miller & Associates, Inc. 42 E. Catawba Street 582 Industrial Park Road Belmont, NC 28012 Bluefield, Virginia 24605 Page intentionally left blank. Proposed Mitigation Plan for Above-Ground Waste Rock Pile with Supporting Information !y- � Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 Table of Contents Page No. 1 Introduction ......................................................................................................................1 2 Above-Ground Waste Rock Pile..........................................................................................1 2.1 Material Placement...................................................................................................... 1 2.2 Cover and Vegetation................................................................................................... 2 2.3 Monitoring, Maintenance, and Reporting Requirements ........................................... 3 2.3.1 Monitoring and Maintenance........................................................................ 3 2.3.1.1 Waste Rock Quantities................................................................... 3 2.3.1.2 Inspections and Maintenance........................................................ 3 2.3.1.2.1 Inspection Items........................................................... 3 2.3.1.2.2 Inspection Intervals...................................................... 3 2.3.1.2.3 Maintenance ................................................................ 4 2.3.2 Data Review ................................................................................................... 4 2.3.3 Reporting Requirements................................................................................ 4 3 Waste Material Characteristics ..........................................................................................4 4 Characteristics of Natural Ground Underlying Waste Rock Pile...........................................5 5 Operation Plan for Monitoring and Potential Mitigation —Above-Ground Waste Rock DisposalArea............................................................................................................6 5.1 Monitoring and Mitigation Actions— Runoff from Surface of Pile or from Water Moving Along Natural Ground Beneath Pile................................................................ 7 5.2 Monitoring and Mitigation Actions— Potential Infiltration into Natural Groundwater System Underlying Pile.......................................................................... 9 5.2.1 Monitoring Wells............................................................................................ 9 5.2.2 Monitoring Plan.............................................................................................. 9 5.2.3 Mitigation Activities....................................................................................... 9 Appendix A Permanent Seeding, Fertilization, Mulching and Soil Amendment Schedule ........................ 11 B Observation Well Location Map for Above-Ground Waste Rock Pile..................................... 13 Marshall Miller&Associates,Inc. i Page intentionally left blank. Proposed Mitigation Plan for Above-Ground Waste Rock Pile with Supporting Information „• , Carolina Lithium Project !�� • Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 1 Introduction This proposed mitigation plan has been prepared by Marshall Miller&Associates, Inc. (MM&A) to address potential concerns related to the proposed above-ground waste rock disposal pile of the Piedmont Lithium Carolinas, Inc. (PLCI) site located approximately seven (7) miles north of Bessemer City, Gaston County, North Carolina. The above-ground waste rock pile is proposed to be constructed with waste rock from the PLCI, Carolina Lithium Project mine site and other excavation materials from plant development sites. The pile material will also include tailings from the concentrator plant, but it will not include tailings from the conversion plant. No offsite material will be combined with the above-ground waste rock pile. The information contained herein provides a summary of existing information for the above-ground waste rock pile, a description of the waste rock material and the natural material beneath the pile, a summary of the previously proposed monitoring and mitigation for the pile, and a supplemental description of a monitoring and mitigation plan for the above-ground waste rock pile in the context of concern for potential infiltration of water from within the pile into the underlying groundwater system. PLCI, or a third party selected by PLCI, will conduct the transfer and placement of the material. The purpose of this document is to provide a summary of the construction, vegetation, and monitoring/reporting requirements for the above-ground waste rock pile, and to supplement previously proposed monitoring and mitigation procedures for the pile by providing guidelines in the event that: 1. Water infiltrating through the above-ground waste rock pile is potentially adverse to the environment, and 2. Potentially adverse water from the above-ground waste rock pile is able to infiltrate into the underlying groundwater system. All monitoring and mitigation plans associated with the above-ground waste rock pile are intended to be incorporated as part of the overall project plan and the Monitoring, Operation and Maintenance Plan (that will be developed prior to and during operations) for the PLCI site. 2 Above-Ground Waste Rock Pile 2.1 Material Placement All waste rock, combined coarse and fine, and concentrator plant tailings will be transported to the above-ground waste rock pile location. Once the material reaches the proposed pile area, the waste rock pile will be constructed as documented in permit document "Concentrate Operations—Guideline Technical Specifications for Waste Rock Disposal Areas" (Appendix D.5 in the August 31, NC Mine Permit Application). The above-ground waste rock pile will have two (2) Marshall Miller&Associates,Inc. 1 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 horizontal to one (1) vertical bench slopes and a finished inter-ramp slope of three (3) horizontal to one (1) vertical. The waste rock pile will be sloped to drain during construction and domed on top upon final grading to effectively shed stormwater. In addition, it will be covered with clay type, native soils for vegetation purposes. 2.2 Cover and Vegetation Vegetation of the final above-ground waste rock pile will involve placement of a low permeability natural soil cover or other materials capable of supporting vegetation on the surface of the waste rock material and subsequently planting to establish a continuous stand of vegetation. The low permeability cover soil shall consist of a minimum thickness of twelve (12) inches of soil with surface organic matter that is capable of supporting final vegetation. All earth moving equipment used to place cover soil shall be sized to limit impacts to over-compaction of soil that may hinder vegetation growth. Seeding will generally be initiated following completion of each twenty (20) foot elevation interval once final grading of the bench and topsoil coverage has been achieved. Areas left disturbed for long periods of time shall be stabilized by seeding per state regulations. Temporary seeding, fertilization, mulch and soil amendment proposed are presented below. Areas seeded during the acceptable permanent seeding period shall be stabilized by permanent seeding requirements. Permanent seeding, fertilization, mulch and soil amendments proposed are presented in Appendix A. In no event shall any provision of this section be construed to allow small pools of water that are, or are likely to become, noxious, odious,or foul to collect or remain on the pile. Suitable drainage ditches or stormwater management piping will be constructed or installed to minimize and avoid surface erosion and concentrated stormwater flow conditions. Upon construction of the final regrade benches of the waste rock pile, stormwater runoff will be directed to a flume to convey the water from the benches and minimize erosion. Once vegetation is established, perimeter ditches will be graded to prevent pooling or standing water onsite. Final soil slopes and soil linings in ditches shall be seeded and mulched to provide a continuous stand of vegetation. The dome-like nature of the final reclaimed surface will minimize infiltration and minimize the potential for flat or depressed areas to form and collect pools of water. The type of vegetative cover and the methods of its establishment shall be specified and shall conform to accepted and recommended agronomic and reforestation/restoration practices as established by the North Carolina Agricultural Experiment Station and North Carolina Department of Environmental Quality (NCDEQ) (Appendix A). Advice and technical assistance may be obtained through the State soil and water conservation districts. Marshall Miller&Associates,Inc. 2 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 2.3 Monitoring, Maintenance, and Reporting Requirements 2.3.1 Monitoring and Maintenance 2.3.1.1 Waste Rock Quantities Records of waste rock quantities disposed of at the facility shall be maintained by PLCI. These records allow comparison with the quantities used for design and facilitate modifications to the design, if necessary. The records shall be reviewed annually. 2.3.1.2 Inspections and Maintenance 2.3.1.2.1 Inspection Items Observations of the waste rock pile and related features are to be recorded by PLCI and include the following: a. Slopes - Any irregularities such as tension cracks, scarps, slumps, wet areas or vegetation disturbance shall be recorded. b. Disposal Surface - Irregularities shall be recorded. c. Bench and Perimeter Sediment Ditches-General condition of channels, soil erosion adjacent to or beneath riprap and seeded slopes, blockage by debris, etc., shall be recorded. d. Areas in Vicinity of the Waste Rock Pile - General conditions throughout the area of the above-ground waste rock pile shall be observed to note any changes over time. 2.3.1.2.2 Inspection Intervals a. Active Construction Operations - During the construction of the pile, inspections will be conducted monthly and immediately following any unusual meteorological events such as floods, heavy rainfalls, heavy frost periods, severe droughts, high winds, abnormal structural behavior, etc. To prevent ponding, attention will be given to ensure material is being placed in accordance with established placement lift parameters and per the design slope. b. Post Construction Operations— Once the construction operations have ceased and the pile is seeded and vegetated, inspections will be conducted quarterly for the first year and immediately following any unusual meteorological events such as floods, heavy rainfalls, heavy frost periods, severe droughts, high winds, abnormal structural behavior, etc. After the first year, post construction monitoring shall be conducted annually until the pile has been inspected two (2) consecutive years with no repairs necessary. Marshall Miller&Associates,Inc. 3 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 2.3.1.2.3 Maintenance Any reseeding, elevation repairs, etc. that are needed to prevent ponding, address safety and stability issues, and minimize erosion shall be conducted following each inspection. If abnormal behavior of any portion of the pile is observed, qualified persons knowledgeable of the facility design characteristics shall be advised immediately and any recommended maintenance measures undertaken. 2.3.2 Data Review Reports or records from the inspections, testing results, and repairs shall be maintained by PLCI onsite. Detail of the inspections and repairs shall be included in the annual reclamation report. PLCI will provide notice to the NCDEQwhen the annual post construction monitoring is scheduled to end after obtaining two (2) consecutive years with no repairs necessary. At the time of notice to the NCDEQ that post construction monitoring is scheduled to end and prior to release, PLCI shall provide to the NCDEQ proof that a note of the mining reclamation activity has been recorded on the deed or notice of the mining reclamation activity has been filed for the property with the local Register of Deeds. 2.3.3 Reporting Requirements During construction, observations (including photographs) shall be recorded on a regular basis in PLCI's Monitoring, Operations and Maintenance Plan. During waste rock disposal operations, stability evaluations of the waste rock pile with field observation results shall be recorded as they occur in PLCI's Monitoring, Operations and Maintenance Plan by a competent person. PLCI shall, when requested by the NCDEQ, provide pH testing of the material generated from the approved locations and from any additional locations proposed by PLCI. 3 Waste Material Characteristics The proposed waste rock will consist predominantly of coarse waste rock produced from the Carolina Lithium Project mine site. The above-ground waste rock area material will also contain a smaller component of fine waste rock, generated from the concentrate plant planned as part of the project. The coarse waste rock, which is approximately 93% of the backfill material, is crushed through a primary jaw crusher to minus 14-inch size. The fine waste rock,the remaining approximately 7%of backfill material, is crushed and processed to minus 1 mm material from the concentrate plant. No tree debris or other Land Clearing and Inert Debris (LCID) materials shall be allowed in the above-ground waste rock pile. Marshall Miller&Associates,Inc. 4 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 As documented in detail in "Leaching Environmental Assessment Framework (LEAF) and Accelerated Weathering of Solid Materials Using a Modified Humidity Cell (ASTM D 5744-96) Collaboration Technical Summary" (Appendix F in the Response to Additional Information Request, dated January 14, 2022), extensive geochemical testing of the waste rock and concentrator plant tailings to be placed in the above-ground waste rock pile resulted in the following conclusion: "In summary, the LEAF Method 1313 and ASTM 5744-96 (humidity cell) test results indicate that the waste rock and concentrator tailings have the potential to create temporarily-elevated pH levels, and associated temporarily-elevated concentrations of some COPCs, in the earliest stages of material placement. However, the long-term humidity cell testing indicates that the temporarily-elevated pH values and associated slightly elevated COPC concentrations are quickly attenuated by the natural buffering capacity of the bedrock material. In addition, since the COPCs that are associated with elevated pH values are pH-dependent, pH-control mitigation measures are applicable. The results indicate that the potential for adverse effects to the environment are not expected and can be reduced or eliminated when pH is maintained between approximately 7.5 to 8.5 through a combination of the material's natural buffering capacity and pH control mitigation measures. In addition to the effects of temporarily-elevated pH (Al and V) in the early stages of waste disposal, certain test results indicate that As and Co are infrequently present under specific geologic and geochemical conditions. Of those, As concentrations from testing are associated only with mudstone and are within the range of As concentrations observed in local groundwater. Elevated Co concentrations can be expected to occur only at lower pH values outside the expected pH range for discharge from the waste material and only appear to be associated with schist, a rock type that is only present in the East Pit Extension area." 4 Characteristics of Natural Ground Underlying Waste Rock Pile Geotechnical soil drilling activities in the area of the proposed above-ground waste rock pile provide data with regard to the type of material and expected permeability of the natural ground underlying the pile. Approximately 17 holes have been drilled in the waste rock pile area. The drilling indicates that the immediate surface material in the area is typically classified as MH (inorganic silts, micaceous or diatomaceous fine sand or silty soil), with occasional zones of ML (inorganic silts and very fine sands, rock flour, silty or clayey fine sands or clayey silts with slight plasticity) and CL (inorganic clays of low to medium plasticity, gravelly clays, sandy clays, silty clays, lean clays). The typical thickness for the uppermost material, which is typically MH, is 3.5 to 6 feet,with some areas having up to 13.5 feet or greater. Standard Penetration Test (SPT) data Marshall Miller&Associates,Inc. 5 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 indicate that the upper material is typically classified as stiff to very stiff. Estimates of permeability for the MH material, based on correlations with Atterberg Limit testing, indicate values ranging from 1x10-5 to 1x10-centimeters/sec(crl values that are typically given a "very low" permeability rating. Loading of the MH material during construction of the waste rock pile has the potential to further reduce the material's conductivity. The MH material at the surface in the waste pile area is expected to impede infiltration and facilitate channeling of water that has infiltrated the pile towards the designed sediment basins. The material beneath the MH soil in most of the holes typically consists of SM (silty sands, sand- silt mixtures). SPT results suggest that the SM material exhibits variable density ranging from loose to medium dense/dense. Depth to weathered bedrock in the area is highly variable, ranging from 13 to 169.5 feet, with values often in the approximately 70 to 120 feet range. Additionally, hole termination depths in the area, interpreted to approximately represent the depth to the top of solid bedrock, are also variable from 24.3 to 174.3 feet, with a most common range of approximately 75 to 160 feet. 5 Operation Plan for Monitoring and Potential Mitigation — Above-Ground Waste Rock Disposal Area The geochemical testing conducted on the material to be placed in the above-ground waste rock pile indicates the potential for temporarily-elevated pH and associated parameters in the earliest stages of pile construction,followed by quick attenuation by the natural buffering capacity of the bedrock material. Monitoring and potential mitigation actions are described below for runoff from the surface of the pile, water moving along the natural ground surface beneath the pile, and water that may infiltrate below the natural ground surface under the pile. Figure 5-1 illustrates the three potential flow paths for water associated with the above-ground waste pile and demonstrates how the water will either flow to the sediment basins for treatment, if necessary (surface runoff or water flowing along natural ground beneath the pile), or will be monitored via monitoring wells installed around the perimeter of the waste pile. More detailed discussion of the proposed monitoring and mitigation is included below. Marshall Miller&Associates,Inc. 6 Proposed Mitigation Plan for �� \► '� Above-Ground Waste Rock Pile with Supporting Information Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 Figure 5-1:Typical Representation of Flow Control and Monitoring, Including Sediment Basins and Proposed Monitoring Wells on Perimeter of Waste Rock Pile SEDIMENT BASIN LOW PERMEABILITY VEGETATED _ NATURA MONITORINGWELLLSOIL SOILCO q'R-�OS�O` , OVEROCKPILD WAS E STREAM EXISTING FLOW TO 5EOiMENT BASIN GROUND .— —i III-I I II I,I III-II '1A1—III II� Crrl —��I I III=III— r—__ 'T7X UNCONSOLIDATED _eo ft I I I I 1 1 III III I i 1 I d I— I, I_ III F�ow TO MONITaRING wets- -15 It WEATHERED ROCK BEDROCK TRANSITION ZONE SCREENEDINTERVAL 5.1 Monitoring and Mitigation Actions — Runoff from Surface of Pile or from Water Moving Along Natural Ground Beneath Pile A discussion of Monitoring and Potential Mitigation specific to runoff from the surface of the pile and from flow along the interface of the waste rock material and natural ground is presented in the document titled "Leaching Environmental Assessment Framework (LEAF) and Accelerated Weathering of Solid Materials Using a Modified Humidity Cell (ASTM D 5744-96) Collaboration Technical Summary' for the above-ground waste rock disposal area: "Design of the above-ground waste rock disposal area inherently facilitates containment and monitoring of runoff from the waste material via site construction and stormwater runoff control measures. Prior to placement of material in the waste rock area, the native, low-permeability silt and clay-rich soil will be pre-compacted to reduce the potential for infiltration of runoff from the waste material into the underlying ground. Incremental placement of waste material onto the pre-compacted, low-permeability silt and clay-rich soil will provide additional densification and compaction of the soil as the waste disposal area is constructed. Rainwater that infiltrates through the waste material will percolate down to the base of the pile, be impeded by the low- permeability soil beneath the waste pile, and discharge to sediment control ponds that are part of the disposal area design.As the pile is constructed from the bottom upwards, each incremental level of the out-slope will be covered with soil and vegetated to progressively decrease the amount of infiltration. Upon completion of the final waste rock and tailings storage area, the top will be "domed" to create positive drainage, to decrease infiltration, and to reduce the potential for Marshall Miller&Associates,Inc. 7 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 pooling of rainwater on the pile. Each sediment control pond is designed to collect runoff from a specific area of the waste rock pile,facilitating thorough monitoring of discharge. Water quantity and quality monitoring for above-ground waste disposal areas will be conducted for the inflow and outflow of sediment control ponds that are part of the existing waste rock pile design (monitoring will be done immediately upstream and downstream of the pond). In addition, monitoring wells positioned along the perimeter of the proposed mine area will be used to monitor for any adverse groundwater effects from the waste rock pile or other portions of the operation. Monitoring of water quality of the inflow to each sediment pond will allow PLCI to evaluate the need for temporary water treatment mitigation procedures on a regular basis. Monitoring of the outflow of each pond will allow PLCI to observe the quality of the final discharge, assess the performance of mitigation procedures, and adjust treatment as necessary. The sampling and testing will be conducted using industry-standard procedures and methods, and certified laboratories. Water quantity and quality monitoring for aboveground waste rock disposal areas will be completed monthly for the first six months of construction and quarterly thereafter, with the option to adjust the frequency of the monitoring based on observed conditions, and subject to review and approval by NC DEMLR. If water quality mitigation is required at a pond, the primary method will be pH adjustment using a low-pH additive, supplemented by flocculant addition if necessary.Adjustment of the pH of water is a common and effective mitigation strategy for a wide variety of mineral, hard rock, and surface mining projects. Upon completion of reclamation activities for above-ground waste disposal areas, water quantity and quality monitoring will be continued until hydrologic equilibrium is established and water quality parameters are stabilized and within regulatory or background ranges." The Operation Plan included above expects that the majority of recharge water that falls on the waste rock pile will run off or be subject to evapotranspiration as a result of the domed top and soil/vegetation cover, or infiltrate the pile and eventually flow along the lower-permeability natural ground at the base of the pile. In both cases, the water from the pile will be collected in the designed sediment control basins situated around the perimeter of the pile. The basins will act as both sediment control structures and provide the means for pH-control mitigation, if needed.The outfalls of the perimeter basins are included for coverage under an NPDES Individual Permit submitted in December 2022; this application is currently under review by the NCDEQ Division of Water Resources-Water Quality Permitting Section (DWR-WQPS). Under that permit, routine monitoring of the outfalls will be required. Marshall Miller&Associates,Inc. 8 Proposed Mitigation Plan for ► Above-Ground Waste Rock Pile with Supporting Information !r' Carolina Lithium Project Piedmont Lithium Carolinas,Inc. Gaston County,North Carolina April 2023 5.2 Monitoring and Mitigation Actions — Potential Infiltration into Natural Groundwater System Underlying Pile 5.2.1 Monitoring Wells In the event that the recharge water does not run off from the surface of the pile or along the natural ground surface beneath the pile, but instead is able to infiltrate into the natural ground and interact with the existing groundwater system, the following monitoring and mitigation plan is proposed. The plan includes monitoring of the shallow groundwater system, the zone from the natural ground surface to the "transition zone" between the base of the unconsolidated zone and the top of solid bedrock, using monitoring wells installed around the perimeter of the pile (Figure 5-1). The proposed monitoring well locations, including both previously proposed and newly proposed wells, are provided in Appendix B. The monitoring wells should be sized large enough to allow for both water level measurement and sample collection via a bailer or pump system. 5.2.2 Monitoring Plan Upon issuance of all required permits, monitoring wells will be constructed and monthly monitoring of the wells will begin. The wells will be monitored for depth to water and pH conditions. Once construction of the waste pile begins, monitoring will continue to include measurement and documentation of depth to water and pH of the water on a monthly basis. 5.2.3 Mitigation Activities In the event that a monitoring well exhibits pH values that are consistently outside of the expected range (-7.5 to 8.5, with consideration of baseline monitoring) and the expected decreasing trend is not observed in the data for three consecutive months,sample collection and analysis for aluminum and vanadium will be added to the monthly testing schedule. Monthly data collection of depth to water, pH,vanadium concentration, and aluminum concentration will continue. After initiation of the more detailed monitoring, if the values of vanadium and aluminum are consistently below the North Carolina Groundwater standard for three consecutive months, then monitoring will return to including only depth to water and pH. In the event that aluminum and/or vanadium concentrations in a well are observed to consistently exceed groundwater standards for three months or greater, with no detection of a decreasing trend in the data, PLCI will consult a hydrogeological expert to assess the real-time data; install additional monitoring wells to determine the extent of the adverse conditions; and install pumping well(s)to capture the adversely affected water and transfer it to a newly designed and constructed surface pond where it can be treated with pH control measures and discharged to the surface water. Marshall Miller&Associates,Inc. 9 Page intentionally left blank. APPENDIX PERMANENT SEEDING, FERTILIZATION, MULCHING AND SOIL AMENDMENT SCHEDULE LLE SOLI EV, Page intentionally left blank. Appendix A LIM-RATE OF APPLICATION ;toms aue r Baia apphodm=a ca.mh-vz m t*cm3sc:ad*n futIIs►cmac=.�c xv:Y.in bar of:cLs wo-rpply 2.0DO-3.040 I m,Km cm cosy d wilt and4,0X-CXC=i,m amins-wftuodsoils.Ras ofdrat.ca.-wz odandadb7$a`XCUEQNCEoim sad Sodimaar Centro:p'ls =and Dwgm Sb—I-Cbaftw 6. FERTILIZER-ANALYSIS Ah7 RATE OF A.DPLSCATION(pounds•acre; 5�:*Zpp Gcsticn rasa m soa7s goat m bo corsdzscoad by:trtro ccaaac:o�htttaaRar,is iioa ci x_:tr x z•F r a 10.10-10 gado iaca7iso< at'CC-:.000 Ja aaa s cabs tsna of:�slae 5orts3xx¢aia rs3 azJc.Rm ar apeb:ad=rwC-= &4.by tbo NC wQ NC Esoeiom and Sodmawr Ccuaci?lam and DVgm mw=I-C rear 5. SEED - TYPE(S) AN-D RATE(S) OF APPLICATION- INCLUDWO PEAR-ROUM SEEDLIG SCHEDUE(pounds acre):[NOTE:brJude Leg^mws] Seed T Seeding Wtes: Seeding Rates: P�mt Seed NC amp Slopo\:a[FR.*ID,mio] 45 Ib�=* 243&m?Iaki�for Ship mmv.of z[mien%-:11] Tsrmzaeat 201h=0 Nm:o Scoop Sitpo\ aath Atsmz,l Ryogza:s�L�IWc-18i] Fo=tsars 15-Aura:::`. 60 Ib:A= Naa:o saw&CPO Na t1Rth GrainRyv[EYE-181-2] k=%L-•t 15-F*trumy:` ?51;,a= Taagrortary Carver Seed BcoM=tt p=:MGC Fodrss,1 Murast 15 10 Ib:aco Aattczl ry o Fmim Aagtut 15-�15 30 Ibs aco n IK I"SMINSm a ump:lop*=far th*Aadtaem and Coastal P=mm=cf N,_ Th.paIl=cr- fmao&=pro:-A.ia:food xW catut.--u-Ldhfo.Tk:wad=z L=b*Fwc:=: L-=E N 3T�a*3: n xa:Ko Fab.--u ix`--ia 15ma.NbX-L03-I\-I I1'•:am at :c=ol aEd z:u„at=-=mac it's n pa=.vmw.�-u: fer zildls:-:,c :mod pL%M=cr &b=t m di:_-bred tiro: M-.i-o3=u can bt g_csaad from ER ST Sao& 2:=oa S- ],Uc`.L•n-h R^o!ER'Dix-181-2�is a soap :laps= I;w-bi;wad�a�a:aaa r•*a�s a caste crop.:Wlu&; k1.4.ktmhAwe j)and pattril a pas:(i wwic.-s•u -.pp' both of�:h anBaum mm;spatial. TYss:a*d=caa h P=,-Iasad Imm E1�iS7 Saab. 1fL-LCH-n71.4, 2C Z.UM 0 F A M 1CAnCN(p�a m),L-M 3g7f:C9D 0F.tN i--"R ''+G: .�-F_tscon me cf xhsa:xsrz:hiI!b:,=r►'.41bs taaa Oa Iocs tbaa 3:i siopot,talc is mctzsqur*d �Jcpos 3:1 ar r•.*srar,tact t,cuxiar is t*gsai Rua of sF::c s:c::acacs�aodad b�tbo xCaEQ NC Fsosim sad;:��:Car_cl?,,•.,;.•_� cr�r3 OTHER %7EGETAM-E COVERS — TYPE (S) AND RATE (S) OF APPL.ICATTO\ L;C 21 % SEEDLtiG SCHEDULE(pounds acre. tree: acre, spacing oftrees.sh&k etc): D-zmr rw* -=rL a wtr."a act' cr=c=br, frcca EMNST Soads urn tba rwxmmomdad:a:a:cc'X :sad mu. Rec-egetatiom and or reforestatior_plan approved by: Sicrnat-are A;t Date 12-06-21 pnrlName DAVID H.WEST Tile SR. LANDSCAPE ARCHITECT: RLA NORTH CARCLINA a::�"$ Aeencv HDR.INC- Marshall Miller&Associates,Inc. 11 Page intentionally left blank. APPENDIX OBSERVATION WELL LOCATION MAP FOR ABOVE-GROUND WASTE ROCK PILE HkLLNNLLER ES Page intentionally left blank. a , r , GroundwaterObservatior, '_.. Well(Currently Proposed): _Nk, +#. SK66 +f SB3 ' 1 SO-10' Groundwater Observation J//f ly Well(Newly Proposed) �r II ffffy � j I \ �1u a � •: , I J r , `Il � ` . WASTE ROCK PILE' 4' ' ,gt�g 1 \ %'�� //// jGroundwater Observation r J /~� \ /Well(Currently Proposed) �,. /( J�� \�� //✓ �,' LOwG tUOE-BI.�B'Ok •,�:�-y� �� /� "-�;, ',��I+fir/� , - % r Groundwater Observation � - Well{Currently Proposed)✓v%" \ MP§�� E O n;;�`�L^��-� ^ir 111 l 'l'r -_ !•�1+ '�, � - `,,IY,\`. _ r •r�- � '! "'��'��z_�____'�` '_` - I 4!t�`��R`1•�� _-_ 1 1+`Y ` 'r 1.- �4'I,'T' _ ;, 0 600 1200 1800 • ♦ \ I I�¢,_ ��\ I 1/ _ �� 1 \,�\loll !•—�� w ,� — I`,\!; - SCALE 1"=600' PIEDMONT LITHIUM CAROLINAS.INC. P l E DM4 N T GASTON COUNTY,NORTH CAROLINA LITHIUM WASTE ROCK PILE GROUNDWATER OBSERVATION WELL �.t LOCATION MAP M.: :.I:•3 Marshall Miller&Associates,Inc. 13 Page intentionally left blank.