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Home My WebLink AboutNC0004979_Erosion & Sedimentation Control Plan_20080301EROSION AND SEDIMENTATION CONTROL PLAN DUKE ENERGY CAROLINAS, LLC ALLEN STEAM STATION COOLING WATER TEMPERATURE CONTROL SYSTEM TEMPORARY PIPE GASTON COUNTY BELMONT, NC Prepared for: Duke Energy Carolinas, LLC Allen Steam Station 253 Plant Allen Rd. Belmont, NC 28012 Prepared by: ORBITAL ENGINEERING, ® INC. 1344 Fifth Avenue Pittsburgh, PA 15219 (412) 261-9100 Project No. 01-9933 March, 2008 .t TABLE OF CONTENTS PAGE 1.0 NARRATIVE................................................................................................................................ 1 1.1 Project Description.............................................................................................................. 1 1.2 Site Description................................................................................................................... 1 1.3 Adjacent Property ............................................................................................................... 2 1.4 Soils.....................................................................................................................................2 4.6 1.5 Planned Erosion and Sedimentation Control Practices....................................................... 2 10 1.5.1 Temporary Gravel Construction Entrance.............................................................. 2 11 1.5.2 Tree Preservation and Protection............................................................................ 2 1.5.3 Land Grading.......................................................................................................... 3 1.5.4 Ash Basin................................................................................................................ 3 1.5.5 Sediment Fence....................................................................................................... 3 1.5.6 Temporary Grass -Lined Diversion Channel........................................................... 3 1.5.7 Temporary Slope Drain........................................................................................... 3 1.5.8 Check Dam.............................................................................................................. 4 1.5.9 Outlet Stabilization Structure.................................................................................. 4 1.5.10 Surface Stabilization............................................................................................... 4 1.5.11 Dust Control............................................................................................................ 4 2.0 CONSTRUCTION SCHEDULE..............:.................................................................................: 5 3.0 MAINTENANCE PLAN.............................................................................................................. 6 4.0 SPECIFICATIONS.......................................................................................................................7 4.1 Temporary Gravel Construction Entrance.......................................................................... 7 4.2 Tree Preservation and Protection........................................................................................ 7 4.3 Land Grading...................................................................................................................... 8 4.4 Sediment Fence................................................................................................................... 8 4.5 Temporary Grass -Lined Diversion Channel....................................................................... 9 4.6 Temporary Slope Drain....................................................................................................... 9 4.7 Check Dam........................................................................................................................ 10 4.8 Outlet Stabilization Structure............................................................................................ 11 5.0 VEGETATIVE PLAN................................................................................................................ 12 FIGURES SITE LOCATION MAP Duke Energy Carolinas, LLC Orbital Engineering, ®Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page i � I Iff EROSION AND SEDIMENTATION CONTROL DRAWINGS DWG. NO. 9933 -CI -001 DWG. NO. 9933 -CI -002 DWG. NO. 9933 -CI -003 Duke Energy Carolinas, LLC Erosion and Sedimentation Control Plan March 2008 Orbital Engineering, ®Inc. Project Number 01-9933 Page ii m 1.0 NARRATIVE 1.1 Project Description Duke Energy Carolinas, LLC, owner of the Allen Steam Station electric power generating facility (Allen Station) proposes to implement a river water bypass system to manage the station's discharge water temperature. The Cooling Water Temperature Control System will be accomplished by adding an intake system of screens and piping downstream of the current intake structure. Four permanent, five-foot diameter water transfer lines, each approximately 2,500 feet long, will be installed below ground to pump river water from the Lake Wylie area of the Catawba River to the station's condenser cooling water discharge canal, which flows to the west fork of the Catawba River. The lake water is at least twenty degrees cooler than the station's condenser cooling water discharge. Mixing the two streams lowers the temperature of the cooling water discharged from the plant property. Prior to the installation of the intake screens and permanent pipes, a system of nine pumps and intake piping feeding one five-foot diameter temporary water transfer line will be installed, primarily above ground, to pump river water to the cooling water discharge canal. This temporary water transfer line is intended to be in-service by June 1", 2008 and operate for approximately one-year. The permanent intake screens and permanent pipes will be in operation by 2009. The total disturbed land area for the temporary line and tree clearing is approximately 4.4 acres. 1.2 Site Description Allen Station is located in Gaston County, North Carolina. Main access to the facility is via South Point Road (Highway 273) (See Site Location Map). The proposed project is located entirely on property owned by Duke Energy Carolinas, LLC (Duke). Construction of the temporary pipe will begin at the Catawba River (Lake Wylie) southeast of the coal pile and north of an existing diversion channel. Nine 20 -inch temporary suction and discharge pipes and pumps will be constructed on a stabilized gravel area or temporary concrete slab near the river. The temporary pipe will be routed west from the pumps, cross under the plant railroad tracks, then proceed around the south side of the coal pile, turn north, cross under Plant Allen Road and continue northeast to the south end of the cooling water discharge. canal. The pipe will be primarily above ground, but will be jacked beneath the railroad tracks southeast of the coal pile and beneath Plant Allen Road, west of the parking lot. Approximately 1350 feet of the proposed construction will be through the coal storage area south of the coal pile, 600 feet will be through a wooded area west of the coal pile and approximately 750 feet will be through a grassy area west of the parking lot and switchyard. The proposed area for clearing, excavating, and grading activities is shown on the Erosion and Sedimentation Control Plan Drawings. The construction area for the proposed temporary water transfer system slopes up from the river elevation (full pond 570 feet) to a ground elevation of 583± feet to a high point at elevation 625± feet located 1,400 feet west of the intake structure. The ground elevation then slopes down to 566± feet at the cooling water discharge channel. Duke Energy Carolinas, LLC Orbital Engineering, ® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 1 W 1.3 Adjacent Property The site is located entirely within Allen Station property. Various residential properties are located along the western border of the Allen Station property. The closest neighboring property is located approximately 0.5 miles from the project site. 1.4 Soils The soils within the project area were identified using the U.S. Department of Agriculture Soil Conservation Service Soil Survey of Gaston County, North Carolina, May 1989. The soil is generally classified as Gaston -Winnsboro -Cecil. Gaston -Winnsboro -Cecil soils are gently sloping to moderately steep, well drained soils that have a loamy surface layer and predominantly clayey subsoil. More specifically, the construction site includes the following soil types: • Ga132 —.Gaston sandy clay loam, 2 to 8 percent slopes, eroded — This soil is well -drained and exists on broad ridges throughout the county. It is found extensively in areas southeast of Belmont. • GaE — Gaston loam, 15 to 25 percent slopes — This soil is well -drained and exists on side slopes and narrow ridges, mostly in the southeastern and northeastern parts of the county along the Catawba and South Fork Catawba Rivers and major creeks. The areas are oblong and irregular in width. • Ud — Udorthents, loamy — This map unit consists of areas where all the original soil has been altered by earthmoving operations. It includes landfills and fly ash deposits. Slopes can be highly variable. • Ur — Urban Land — This map unit consists of areas where more than 85 percent of the land is covered by streets, buildings, parking lots, railroad yards, and/or other impervious cover. 1.5 Planned Erosion and Sedimentation Control Practices 1.5.1 Temporary Gravel Construction Entrance Two temporary gravel construction entrances will be constructed off the main entrance road. One will allow access to the area north of Plant Allen Road, the other will allow access to the area south of Plant Allen Road. The construction entrances will be at least 20 feet wide and 50 feet long. The Contractor shall be responsible for maintaining and cleaning the entrance (See Section 4.1). 1.5.2 Tree Preservation and Protection Some tree clearing will be required prior to installation of the temporary pipe. Whenever possible, healthy trees on the construction site will be protected and preserved (See Section 4.2). Duke Energy Carolinas, LLC Erosion and Sedimentation Control Plan March 2008 Orbital Engineering, ® Inc. Project Number 01-9933 Page 2 1.5.3 Land Grading Minimal land grading will be required to install the temporary pipe. Land grading will be required to install the temporary grass -lined channel in the area between Plant Allen Road and the cooling water discharge canal (See Section 4.3). 1.5.4 Ash Basin Nearly all runoff from the construction site will be directed into the existing ash basin via the sump pumps that service the Allen Station's storm sewer system and coal yard. The ash basin is located approximately 2,000 feet south of the coal yard. See the area identified as "Tailings Pond" on the site location map. The existing ash basin covers approximately 115 acres. The ash basin is more than large enough to accommodate and adequately treat storm water runoff from the construction site. 1.5.5 Sediment Fence Sediment fence will be placed down slope of the disturbed areas at intervals specified in the North Carolina Erosion and Sediment Control Planning and Design Manual. The sediment fence can be removed upon site stabilization (See Section 4.4). 1.5.6 Temporary Grass -Lined Diversion Channel A temporary grass -lined diversion channel is to be installed to divert up -gradient water around the construction site. The diversion channel will be installed approximately 25 feet north of the plant entrance road at elevation 624 feet. The channel travels north for 565 feet, ending at an approximate elevation of 619 feet. (See Section 4.5). 1.5.7 Temporary Slope Drain An 18" temporary slope drain is to be installed to divert water from the temporary grass - lined diversion channel into the existing 36" CMP pipe draining to the canal. The 133 foot long pipe will be installed at the downstream end of the temporary grass -lined diversion channel, at an elevation of 619 feet, ending at an elevation of 573 feet (See Section 4.6). A second slope drain will be installed to convey water from the west side of the water transfer line to the coal yard. Duke Energy Carolinas, LLC Erosion and Sedimentation Control Plan March 2008 Orbital Engineering, ® Inc. Project Number 01-9933 Page 3 1.5.8 Check Dam Two check dams will be installed in the existing ditch discharging to the canal. One will be installed on the eastern edge of the limit of disturbance, and the other will be installed on the western edge of the limit of disturbance. A series of five check dams will be installed in the area where the temporary pipe crosses the western berm of the coal pile to reduce the velocity of the water impounded behind the temporary pipe (See Section 4.7). 1.5.9 Outlet Stabilization Structure A temporary slope drain will be installed to convey flow from the west side of the temporary discharge line, where the check dams impound water, down the western berm of the coal pile. An outlet stabilization structure will be installed to prevent erosion at the outlet of this pipe (See Section 4.8). 1.5.10 Surface Stabilization Some surface stabilization will be required, but the majority of the vegetation on the site will remain intact. The Contractor will clear trees in the path of the temporary pipe and vegetation in the areas where underground pipe will be installed. Surface stabilization will be accomplished with vegetation and mulch as specified in the vegetation plan (See Section 5.0). Vegetation will be planted immediately upon completion of grading. 1.5.11 Dust Control Dust control is not expected to be a problem due to the clayey soil conditions and the distance from the site to the nearest area of concern. Should an extensive dry weather period result in generation of excessive dust, dust control water spray will be performed on problem areas. Duke Energy Carolinas, LLC Orbital Engineering,® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 4 2.0 CONSTRUCTION SCHEDULE 1. Obtain plan approval and other applicable permit approvals. 2. Flag work limits and mark buffer areas and trees to be protected. 3. Hold preconstruction conference at least one-week prior to initiating construction. 4. Construct temporary construction entrances at existing access road. 5. Construct temporary grass -lined diversion channel and install sediment fence as needed. 6. Clear necessary trees. Install additional sediment fence as needed. 7. Install above and below ground piping, excavate and backfill earth to specified grade for underground pipe sections. Install the nine temporary suction pipes and pumps concurrently. 8. Permanently vegetate, landscape and mulch. 9. Inspect all erosion and sediment -control practices weekly and after rainfall events. Make needed repairs immediately. 10. Upon site stabilization, remove all temporary measures and install permanent vegetation on the disturbed areas. Duke Energy Carolinas, LLC Orbital Engineering, ® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 5 3.0 MAINTENANCE PLAN The Contractor will be responsible for maintenance of the erosion control measures during the construction of the project. Upon completion of the project, the owner of the facility is responsible for maintaining the permanent erosion control measures. Typical maintenance issues include the following: • All erosion and sediment control practices will be checked for stability and functionality following every runoff -producing rainfall, but in no case less than once every two weeks. Any needed repairs will be made immediately to maintain all practices as designed. • Sediment will be removed from behind the sediment fence when it accumulates to approximately 0.5 foot at the fence. The sediment fence shall be repaired as necessary to maintain a barrier. • All seeded areas will be fertilized, reseeded as necessary, and mulched according to specifications in the vegetative plan to maintain a vigorous, dense vegetative cover. • Check the grass -lined diversion channel after every heavy rainfall event and biweekly. Immediately make repairs. Remove all significant sediment accumulations to maintain the designed carrying capacity. Keep grass in a healthy, vigorous condition at all times. • Inspect the slope drain and supporting diversion. after every rainfall, and promptly make necessary repairs. When the protected area has been permanently stabilized, temporary Measures may be removed, materials disposed of properly, and all disturbed areas stabilized appropriately.. Duke Energy Carolinas, LLC Orbital Engineering, ® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 6 4.0 SPECIFICATIONS 4.1 Temporary Gravel Construction Entrance 1. Clear the existing roadway and roadway shoulders of all vegetation, roots, and other undesirable material. 2. Install in accordance with detail shown on Drawing No. 9933 -CI -003. 3. Use crushed stone 2 — 3 inches in size. 4. After each rainfall, inspect any structure used to trap sediment and clean as necessary. 5. The gravel roadway shall be maintained in a condition to prevent mud or sediment from leaving the site. This may require periodic topdressing with 2 inch stone. Should mud be tracked or washed onto public roads, it must be removed immediately. The nearest public road is approximately 0.5 miles from the proposed construction site. 6. If conditions at the site are such that most of the mud and sediment are not removed by vehicles traveling over the gravel, the tires should be washed. Washing should be done on an area stabilized with crushed stone that is conveyed to the ash basin via the coal pile sump pump or storm drain system. 4.2 Tree Preservation and Protection 1. Place barriers to prevent the approach of equipment within the drip line of trees to be retained. 2. Do not nail boards to trees during building operations. 3. Do not cut tree roots inside the tree drip line. 4. Do not place equipment, construction materials, topsoil, or fill dirt within the limit of the drip line of trees to be saved. 5. If a tree marked for preservation is damaged, remove it and replace it with a tree of the same or similar species, 2 -inch caliper or larger, from balled and burlaped nursery stock when activity in the area is complete. 6. During final site cleanup, remove barriers around trees. Duke Energy Carolinas, LLC Orbital Engineering'® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 7 4.3 Land Grading 1. Construct and maintain all erosion and sedimentation control practices and measures in accordance with the approved sedimentation control plan and construction schedule. 2. Remove quality topsoil from areas to be graded and filled, and preserve it for use in finishing the grading of critical areas. 3. Scarify areas to be topsoiled to a minimum depth of 2 inches before placing topsoil. 4. Clear and grub areas to be filled by removing trees, vegetation, roots, or other undesirable material that would affect the planned stability of the fill. 5. Ensure that fill material is free of brush, rubbish, rocks, logs, stumps, building debris, and other materials inappropriate for constructing stable fills. 6. Place all fill in layers not to exceed 9 inches in thickness, and compact the layers as required to reduce erosion, slippage, settlement, or other related problems. 7. Do not incorporate frozen, soft, mucky, or highly compressible materials into fill slopes. 8. Do not place fill on a frozen foundation. 9. Keep diversions and other water conveyance measures free of sediment during all phases of development. 10. Handle seeps or springs encountered during construction in accordance with approved methods found in the North Carolina Erosion and Sediment Control Planning and Design Manual. 11. Permanently stabilize all graded areas immediately after final grading is completed on each area. Apply temporary stabilization measures on all graded areas when work is to be interrupted or delayed for 30 working days or longer. 4.4 Sediment Fence 1. Construct the sediment fence at locations per the erosion and sedimentation control drawings. 2. Install sediment fence in accordance with detail shown on Drawing No. 9933 -CI -001 3. Locate posts down slope of fabric to help support fencing. 4. Bury toe of fence approximately 8 inches deep to prevent undercutting. Duke Energy Carolinas, LLC Orbital Engineering,® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 8 5. Construct the filter fabric from a continuous roll cut to the length of the barrier to avoid joints. When joints are necessary, securely fasten the fabric only at a support post with 4 feet minimum overlap to the next post. 6. Ensure the height of the sediment fence does not exceed 24 inches above the ground surface. 7. Use a synthetic filter fabric of at least 95% by weight of polyolefins or polyester, which is certified by the manufacturer or supplier as conforming to the requirements in ASTM D 6461. Fabric should contain ultraviolet inhibitors and stabilizers to provide a minimum of 6 months of expected usable construction life over a temperature range of 0 to 120°F. 8. Post should be 1.33 lb/linear ft steel with a minimum length of 5 feet. Make sure that posts have projections to facilitate fastening the fabric. 4.5 Temporary Grass -Lined Diversion Channel 1. Remove and properly dispose of all trees, brush, stumps, and other objectionable material. 2. Install the temporary grass -lined diversion channel in accordance with detail shown on Drawing No. 9933 -CI -003. 3. Excavate the channel, and shape it to neat lines and dimensions shown on the plans plus a 0.2 foot overcut around the channel perimeter to allow for bulking during seedbed preparations and sod buildup. 4. Remove and properly dispose of all excess soil so that surface water may enter the channel freely. 5. Protect the channel with mulch or a temporary liner sufficient to withstand anticipated velocities during the establishment period. 6. During the establishment period, check grass -lined channels after every rainfall. After grass is established, check the channel after every heavy rainfall event and biweekly. Immediately make repairs. Remove all significant sediment accumulations to maintain the designed carrying capacity. Keep grass in a healthy, vigorous condition at all times. 4.6 Temporary Slope Drain 1. Place slope drains on undisturbed soil or well compacted fill at locations and elevations shown on the Erosion and Sedimentation Control Drawings. Install the slope drain in accordance with the detail shown on Drawing No. 9933 -CI -003. Duke Energy Carolinas, LLC Orbital Engineering, ® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 9 2. Slightly slope the section of drainage pipe under the dike toward its outlet. 3. Hand tamp the soil under and around the entrance section in lifts not to exceed 6 inches. 4. Ensure that fill over the drain at the top of the slope has minimum dimensions of 1.5 feet depth, 4 feet top width, and 3:1 side slopes. 5. Ensure that all slope drain connections are watertight. 6. Ensure that all fill material is well -compacted. Securely fasten the exposed section of the drain with grommets or stakes spaced no more than 10 feet apart. 7. Extend the drain beyond the toe of the slope, and adequately protect the outlet from erosion. 8. Make the settled, compacted dike ridge no less than 1 foot above the top of the 'drainage pipe at every point. 9. Immediately stabilize all disturbed areas following construction. 10. Inspect the slope drain and supporting diversion after every. rainfall, and promptly make necessary repairs. When the protected area has been permanently stabilized, temporary measures may be removed, materials disposed of properly, and all disturbed areas stabilized appropriately. 4.7 Check Dam 1. Install in accordance with detail shown in Drawing No. 9933 -CI -002. 2. Keep the center stone section at least 9 inches below natural ground level where the dam abut the channel banks. 3. Extend stone at least 1.5 feet beyond the ditch bank to keep water from cutting around the ends of the check dam. 4. Protect the channel after the lowest check dam from heavy flow that could cause erosion. 5. Make sure that the channel reach above the most upstream dam is stable. 6. Ensure that other areas of the channel, such as culvert entrances below the check dams, are not subject to damage or blockage from displaced stone. Duke Energy Carolinas, LLC Orbital Engineering, ® Inc. Erosion and Sedimentation Control Plan ProjectNumber 01-9933 March 2008 Page 10 4.8 Outlet Stabilization Structure 1. Ensure that the subgrade for the filter and riprap follows the required lines and grades shown in the plan. Compact any fill required in the subgrade to the density of the surrounding undisturbed material. Low areas in the subgrade on undisturbed soil may also be filled by increasing the riprap thickness. 2. Install in accordance with detail shown on Drawing No. 9933 -CI -002. 3. The riprap and gravel filter must conform to the specified grading limits shown on the plans. 4. Filter cloth, when used, must meet design requirements and be properly protected from punching or tearing during installation. Repair any damage by removing the riprap and placing another piece of filter cloth over the damaged area. All connecting joints should overlap so the top layer is above the downstream layer a minimum of 1 foot. If the damage is extensive, replace the entire filter cloth. 5. Riprap may be placed by equipment, but take care to avoid damaging the filter. 6. The minimum thickness of the riprap should be 1.5 times the maximum stone diameter. 7. Riprap may be field stone or rough quarry stone. It should be hard, angular, highly weather - resistant and well graded. 8. Construct the apron on zero grade with no overfill at the end. Make the top of the riprap at the downstream end level with the receiving area or slightly below it. 9. Ensure that the apron is properly aligned with the receiving stream and preferably straight throughout its length. If a curve is needed to fit site conditions, place it in the upper section of the apron. 10. Immediately after construction, stabilize all disturbed areas with vegetation. 11. Inspect riprap structures weekly and after significant (0.5 inch or greater) rainfall events to see if any erosion around or below the riprap has taken place, or if stones have been dislodged. Immediately make all needed reparis to prevent further damage. Duke Energy Carolinas, LLC Erosion and Sedimentation Control Plan March 2008 Orbital Engineering, ® Inc. Project Number 01-9933 Page 11 5.0 VEGETATIVE PLAN As per Table 6. I Ob of the North Carolina Erosion and Sediment Control Planning and Design Manual, the recommended temporary seeding mixture for the Piedmont region in the summer months (May 1 -August 15) is a small -stemmed Sudangrass. This grass should be applied at a rate of 50 lb/acre. Temporary ground cover shall be placed on exposed slopes within 15 working days following completion of any phase of grading. Seedbed Preparation 1. Ensure the seedbed is well -pulverized, loose and uniform. Where hydroseeding methods are used, the surface may be more irregular and contain large clods and stones. 2. Apply lime according to soil test recommendations or apply 2,000 lb/acre ground agricultural limestone. Apply limestone uniformly and incorporate into the top 4-6 inches of soil. Soils with a pH of 6 or higher need not be limed. Base fertilizer application rates on soil test recommendations or, if not available, apply 750 lb/acre of 10-10-10 fertilizer. Incorporate into the top 4-6 inches of soil. If a hydraulic seeder is used, do not mix seed and fertilizer more than 30 minutes before application. 4. If recent tillage operations have resulted in a loose surface, additional roughening may not be required, except to break up large clods. If rainfall causes the surface to become sealed or crusted, loosen it just prior to seeding by disking, raking, harrowing, or other suitable methods. Groove or furrow slopes steeper than 3:1 on the contour before seeding. Seeding Methods Evenly apply seed at the recommended rate with a cyclone seeder, drop spreader, or cultipacker seeder at the recommended rate of 50 lb/acre. Broadcast seeding and hydroseeding are appropriate for steep slopes where equipment cannot be driven. 2. Small grains should be planted no more than 1 inch deep, and grasses and legumes no more than %2 inch. Broadcast seed must be covered by raking or chain dragging, and then lightly firmed with a roller or cultipacker. Hydroseeded mixtures should include a wood fiber (cellulose) mulch. Mulch Mulch temporary seedings immediately. Apply seed before mulching except when seed is applied as part of a hydroseeder slurry containing wood fiber mulch or when a hydroseeder slurry is applied over straw. 2. Use an organic mulch, such as straw, wood chips or shredded bark, but not wood fiber. Duke Energy Carolinas, LLC Erosion and Sedimentation Control Plan Orbital Engineering,® Inc. Project Number 01-9933 March 2008 Page 12 3. The choice of materials for mulching should be based on soil conditions, season, type of vegetation, and size of the area. A properly applied and tacked mulch is always beneficial, especially when conditions for germination are not optimum. Maintenance 1. Reseed, fertilize, and mulch as necessary. Duke Energy Carolinas, LLC Orbital Engineering, ® Inc. Erosion and Sedimentation Control Plan Project Number 01-9933 March 2008 Page 13 FIGURES REFERENCE MAP: U.S.G.S. 7.5 MINUTE TOPOGRAPHIC MAP OF BELMONT NC -SC NORTH CAROLINA 1997; 1927 NORTH AMERICAN DATUM; U.S.G.S. 7.5 MINUTE TOPOGRAPHIC MAP OF CHAROLETTE WEST, NC 1993; 1927 NORTH AMERICAN DATUM; ELEVATIONS IN FEET QUADRANGLE LOCATION 3 f � ,�. `a.� q•�., t' ✓t7 ' 77 f t } r'� �I� � :. .`'ir.. "� � \ t ^` ` �s r _,, E' [ T � � 'r.. 1 x � .,r' i �\`ti `3 a�� `.,..,f 1 �. r`-• _ ix� r€� r t r ;: %ori ,y �� s� � � ,� •� yq .. 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