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1560 TANGLEWOOD F;ZD
<br />XF;ZON.0, MINNESOTA
<br />MATERIAL NOTES
<br />1. Concrete Retaining Wall Units: "Anchor Diamond Pro Retaining Wall Units".
<br />2. Geosynthetic Reinforcement: Miragrid 3XT, as shown on the Drawings.
<br />3. Leveling Pad Base: Clean crushed stone or granular fill meeting the followning gradation as determined in accordance with ASTM
<br />D448.
<br />Sieve Size Percent Passing
<br />1 Inch 100
<br />No. 4 35 to 70
<br />No. 40 10 to 35
<br />No. 200 3 to 10
<br />a. Base Thickness: 6 inches (minimum compacted thickness).
<br />4. Drainage Aggregate: Clean crushed stone or granular fill meeting the following gradation as determined in accordance with ASTM
<br />D448.
<br />Sieve Size Percent Passing
<br />11/2 Inch 100
<br />4 inch 75-100
<br />No. 40 0-50
<br />No. 200 0-5
<br />5. Reinforced Fill: Material can be site excavated soils where the above requirements can be met and whose soil properties meet the soil
<br />design properties. Unsuitable soils for backfill (high plastic clays or organic soils) shall not be used in the backfill or in the reinforced
<br />soil mass.
<br />5.1. Unsuitable soils are organic soils and those soils classified as CH, OH, MH, OL, or PT.
<br />6. Impervious Material: Clayey soil or other similar material which will prevent percolation into the drainage zone behind the wall.
<br />7. Drainage Pipe: Perforated or slotted PVC or corrugated HDPE pipe manufactured in accordance with D3034 and/or ASTM F405. The
<br />pipe may be covered with a geotextile filter fabric to function as a filter.
<br />7.1. Drainage pipe shall be manufactured in accordance with ASTM D3034 and/or ASTM D1248.
<br />8. Construction Adhesive: Exterior grade adhesive as recommended by the retaining wall manufacturer.
<br />FOUNDATION SOIL NOTES
<br />1. Excavate foundation soil as required for footing or base dimension shown on the Drawings, or as directed by the Project geotechnical
<br />engineer.
<br />2. The Owner may retain the services of a geotechnical engineer to examine foundation soil to ensure that the actual foundation soil
<br />strength meets or exceeds that indicated on the Drawings. Unsuitable soils are defined as any soil that does not have sufficient bearing
<br />capacity or will cause excessive wall settlement. Remove soil not meeting the required strength. Oversize resulting space sufficiently
<br />from the front of the block to the back of the reinforcement, and backfill with suitable compacted backfill soils.
<br />3. The Owner shall retain the services of a geotechnical engineer to determine if the foundation soils will require special treatment or
<br />correction to control total and differential settlement.
<br />4. Fill over -excavated areas with suitable compacted backfill, as recommended by the Project geotechnical engineer.
<br />BASE COURSE NOTES
<br />1. Place base materials to the depths and widths shown on the Drawings, upon undisturbed soils, or foundation soils prepared as directed
<br />by the project geotechnical engineer.
<br />a. Extend the leveling pad laterally at least 6 inches in front and behind the lowermost concrete retaining wall unit.
<br />b. Provide aggregate base compacted to 6 inches thick (minimum).
<br />2. Compact aggregate base material to provide a level, hard surface on which to place the first course of units.
<br />3. Prepare base materials to ensure complete contact with retaining wall units. Gaps are not allowed.
<br />ERECTION NOTES
<br />1. Excavation support, if required, is the responsibility of the Contractor, including the stability of the excavation and its influence on
<br />adjacent properties and structures.
<br />2. General: Erect units in accordance with manufacturer's instructions and recommendations, and as specified herein.
<br />3. Place first course of concrete wall units on the prepared base material. Check units for level and alignment. Maintain the same
<br />elevation at the top of each unit within each section of the base course.
<br />4. Ensure that foundation units are in full contact with natural or compacted soil base.
<br />5. Place concrete wall units side-by-side for full length of wall alignment. Alignment may be done by using a string line measured from the
<br />back of the block. Gaps are not allowed between the foundation concrete wall units.
<br />6. Place 12 inches (minimum) of drainage aggregate between, and directly behind the concrete wall units. Fill voids in retaining wall units
<br />with drainage aggregate. Provide a drainage zone behind the wall units to within 12 inches of the final grade. Cap the backfill and
<br />drainage aggregate zone with 12 inches of impervious material.
<br />7. Install drainage pipe at the lowest elevation possible, to maintain gravity flow of water to outside of the reinforced zone. Slope the main
<br />collection drainage pipe, located just behind the concrete retaining wall units, 1/4" per foot (minimum) to provide gravity flow to the
<br />daylighted areas. Daylight the main collection drainage pipe to an appropriate location away from the wall system at each low point or
<br />at 50 foot (maximum) intervals along the wall.
<br />8. Remove excess fill from top of units and install next course. Ensure drainage aggregate and backfill are compacted before installation
<br />of next course.
<br />9. Check each course for level and alignment. Adjust units as necessary with reinforcement shims to maintain level, alignment, and
<br />setback prior to proceeding with each additional course.
<br />10. Install each succeeding course. Backfill as each course is completed. Pull the units forward until the locating surface of the unit
<br />contacts the locating surface of the units in the preceding course. Interlock wall segments that meet at corners by overlapping
<br />successive courses. Attach concrete retaining wall units at exterior corners with adhesive specified.
<br />11. Install geosynthetic reinforcement in accordance with geosynthetic manufacturer's recommendations and the shop drawings.
<br />a. Orient geosynthetic reinforcement with the highest strength axis perpendicular to the wall face.
<br />b. Prior to geosynthetic reinforcement placement, place the backfill and compact to the elevation of the top of the wall units at the
<br />elevation of the geosynthetic reinforcement.
<br />c. Place geosynthetic reinforcement at the elevations and to the lengths shown on the Drawings.
<br />d. Lay geosynthetic reinforcement horizontally on top of the concrete retaining wall units and the compacted backfill soils. Place the
<br />geosynthetic reinforcement within one inch of the face of the concrete retaining wall units. Place the next course of concrete
<br />retaining wall units on top of the geosynthetic reinforcement.
<br />e. The geosynthetic reinforcement shall be in tension and free from wrinkles prior to placement of the backfill soils. Pull geosynthetic
<br />reinforcement hand -taut and secure in place with staples, stakes, or by hand -tensioning until the geosynthetic reinforcement is
<br />covered by 6 inches of loose fill.
<br />f. The geosynthetic reinforcements shall be continuous throughout their embedment lengths. Splices in the geosynthetic
<br />reinforcement strength direction are not allowed.
<br />g. Do not operate tracked construction equipment directly on the geosynthetic reinforcement. At least 6 inches of compacted backfill
<br />soil is required prior to operation of tracked vehicles over the geosynthetic reinforcement. Keep turning of tracked construction
<br />equipment to a minimum.
<br />h. Rubber -tired equipment may pass over the geosynthetic reinforcement at speeds of less than 5 miles per hour. Turning of
<br />rubber -tired equipment is not allowed on geosynthetic reinforcement.
<br />BACKFILL PLACEMENT NOTES
<br />1. Place reinforced backfill, spread and compact in a manner that will minimize slack in the reinforcement.
<br />2. Place fill within the reinforced zone and compact in lifts not exceeding 6 to 8 inches (loose thickness) where hand -operated compaction equipment is
<br />used, and not exceeding 12 inches (loose thickness) where heavy, self propelled compaction equipment is used.
<br />a. Only lightweight hand -operated compaction equipment is allowed within 3 feet of the back of the retaining wall units. If unable to achieve minimum
<br />compaction requirements replace the reinforced soil in this zone with drainage aggregate material.
<br />3. Minimum Compaction Requirements for Fill Placed in the Reinforced Zone:
<br />a. Compact to 98 percent of the soil's standard Proctor maximum dry density (ASTM D698) for the entire wall height.
<br />b. Increase compaction requirements for retaining walls with slope heights at the back of the reinforced soil zone greater than 5 feet above the top of
<br />wall. Verify compaction requirements with the Project geotechnical engineer.
<br />c. Utility Trench Backfill: Compact utility trench backfill in or below the reinforced soil zone to 98 percent of the soil's standard Proctor maximum dry
<br />density (ASTM D698), or as recommended by the Project geotechnical engineer.
<br />d. Moisture Content: Within 2 percentage points of the optimum moisture content for all wall heights.
<br />e. These notes may be changed based on recommendations by the Project geotechnical engineer.
<br />4. At the end of each day's operation, the backfill shall be graded and sealed with proof rolling to prevent ponding of water on the partially completed
<br />surface of the reinforced soil mass.
<br />a. The General Contractor is responsible for ensuring that the finished site drainage is directed away from the retaining wall system.
<br />b. In addition, the General Contractor is responsible for ensuring that surface water runoff from adjacent construction areas is not allowed to enter the
<br />retaining wall area of the construction site.
<br />5. The foundation is considered to extend from the front of the block to the rear of the reinforced soil zone. The excavation will need to be properly
<br />oversized (per General Note #3) to provide lateral support for the new structural fill soils, providing oversizing and a safe backslope for construction will
<br />significantly increase the size of the excavation.
<br />CAP UNIT INSTALLATION NOTES
<br />1. Apply adhesive to the top surface of the unit below and place the cap unit into desired position.
<br />2. Cut cap units as necessary to obtain the proper fit.
<br />3. Backfill and compact to top of cap unit.
<br />WALL CONSTRUCTION TOLERANCE NOTES
<br />1. Wall Construction Tolerances:
<br />a. Vertical Alignment: Plus or minus 1-1/4 inches over any 10 -foot distance, with a maximum differential of 3 inches over the length of the wall.
<br />b. Horizontal Location Control from Grading Plan:
<br />b.1. Straight Lines: Plus or minus 1-1/4 inches over any 10 -foot distance, with a maximum differential of 3 inches over the length of the wall.
<br />b.2. Corner and Radius Locations: Plus or minus 12 inches.
<br />b.3. Curves and Serpentine Radii: Plus or minus 2 feet.
<br />c. Geogrid placement tolerances:
<br />c.1. Elevation: 1 inch
<br />c.2. Horizontal: Continuous horizontally, within +1 foot on ends of layers
<br />c.3. Length: Equal to or greater than minimum length shown on plans
<br />d. Immediate Post Construction Wall Batter: Within 2 degrees of the design batter of the concrete retaining wall units.
<br />e. Bulging: Pius or minus 1-1/4 inches over any 10 -foot distance.
<br />FIELD QUALITY CONTROL NOTES
<br />1. Installer is responsible for quality control of installation of system components.
<br />2. The Owner, at their expense, may retain a qualified professional to perform quality assurance checks of the installer's work.
<br />3. Correct work which does not meet these specifications or the requirements shown on the Drawings at the installer's expense.
<br />4. The Owner or Owner's Representative may retain the services of a geotechnical engineer to perform compaction testing of the reinforced backfill placed
<br />and compacted in the reinforced backfill zone.
<br />a. Testing Frequency (or as directed by Project Geotechnical Engineer), make at least one random field density test of new materials for every 150
<br />square yards area for each 6" depth of material, but in no case less than one test per 12" depth.
<br />b. Vary compaction test locations to cover the entire area of the reinforced soil zone, including the area compacted by the hand -operated compaction
<br />equipment.
<br />5. Installer is responsible for quality control of installation of system components.
<br />6. Correct work which does not meet these specifications or the requirements shown on the Drawings at the installer's expense.
<br />UTILITY NOTES
<br />1. If utilities are located within the proposed reinforced zone the Gray Engineering, LLC must be notified prior to construction of the segmental retaining
<br />walls to review the design and/or plans.
<br />2. Utilities must be properly designed to withstand all forces from the segmental retaining wall units, reinforced soil mass, and surcharge loads.
<br />3. Storm drains are prone to leaking. Therefore, if a joint in a storm drain is located within 100 feet of the retaining wall the storm water pipe must be water
<br />tight. Neoprene O -rings must be installed at all storm pipe joints as a minimum.
<br />4. Water lines, including irrigation systems, must be watertight within 100 feet of the retaining wall. Leakage behind a retaining wall will increase the
<br />horizontal pressure against the wall leading to wall failure. For this reason, subsurface waterlines and irrigation systems should not be installed above
<br />the reinforced zones of the retaining wall, or within 5 feet of the reinforced zone.
<br />GENERAL NOTES
<br />1. The soil strength parameters for design of the segmental retaining walls were not provided to Gray Engineering, LLC. The design parameters were
<br />assumed from other projects in the City of Orono, MN. If the soil strength parameters are found to be inconsistent with those to Gray Engineering, LLC,
<br />this design is no longer valid and it is the responsibility of the owner or owner's representative to notify the Gray Engineering, LLC so the retaining wall
<br />system can be redesigned. Failure to notify the Gray Engineering, LLC may result in failure of the retaining wall.
<br />2. Assumed Design Soil Parameters:
<br />a. Reinforced soil: Imported Granular soil phi = 32 degrees gamma = 120 pcf.
<br />b. Retained soil: Imported/on-site soil phi = 28 degrees gamma = 120 pcf.
<br />c. Foundation soil: Imported/on-site soil phi = 28 degrees gamma = 120 pcf
<br />3. Any excavation below the wall should have proper 1:1 lateral oversizing. Excavation oversizing should be measured from the front of the gravel leveling
<br />pad and the back of the lowest reinforcement layer. Refer to detail 3 on sheet W2.
<br />4. Wall stationing shown on sheet W2 is not related to any other stationing shown on the grading plans. Station 0+00 is on the left end of the wall as seen
<br />from the front of the wall.
<br />5. This set of segmental retaining wall plans are based on the Pool and Landscape plan prepared by BellaWood Builders, dated October 15, 2013. If other
<br />grading plans are produced that contain different information than that referenced, this plan may need to be revised and/or the walls may need to be
<br />redesigned.
<br />6. This set of segmental retaining wall plans are based specifically on the wall being constructed with Anchor Diamond Pro block and the Mirafi Miragrid
<br />3XT reinforcement products. Absolutely no substitutions allowed.
<br />7. Location of the segmental retaining wall in relation to property lines, utility easements, watershed easements, or any other type of easements are the
<br />responsibility of the owner or the site civil engineer. Gray Engineering, LLC assumes no liability for the location of the segmental retaining wall, or if
<br />construction of the proposed segmental retaining wall encroaches any property lines or easements.
<br />8. It is imperative that the site surveying of the segmental retaining wall be done by the site civil engineer or surveyor and must be based on computer
<br />generated site/grading plans and not profile plans done by Gray Engineering, LLC. Surveying of the segmental retaining wall must take into account the
<br />design batter indicated on the enclosed plans and details. Failure to take into account wall batter for segmental retaining wall surveying will produce
<br />incorrect locations of all top of walls and shall be corrected at no cost to Gray Engineering, LLC or the segmental retaining wall contractor.
<br />9. Wall geometry, locations, slopes and surcharge loads for the segmental retaining walls were measured from the site grading plan referenced above, and
<br />partially reproduced to the right. If conditions vary in the field from those shown on this plan, Gray Engineering, LLC must be notified prior to
<br />construction of the segmental retaining walls to review the design and/or plans.
<br />10. If there are discrepancies between any information on these plans and information in the project specifications, the more restrictive information takes
<br />precedence.
<br />976
<br />Fence Screen
<br />AC Units
<br />Planting Area
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<br />Minimum Distance from Pool Deck to Outside
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<br />Vinyl Pool
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<br />976.2.1
<br />KEY PLAN
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<br />JO
<br />THE SITE PLAN SHOWN IS FOR ILLUSTRATIVE
<br />PURPOSES ONLY, IT HAS BEEN REPRODUCED FROM
<br />BellaWood Builders, Pool and Landscape Plan, October 15, 2013.
<br />SHEET INDEX
<br />PAGE DESCRIPTION
<br />W1 TITLE PAGE/KEY PLAN
<br />W2 WALL ELEVATIONS
<br />W2 SECTIONS AND DETAILS
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<br />SEP 21 2015 TITLE PAGE/
<br />CITY OF ORONO KEY PLAN
<br />151110
<br />:--0t4- 01p404
<br />115r`9• Rt,AWrime Wait PLOM
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