Base Course Design and Construction

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Kenneth Webb
5 years ago
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Part I General A. This information is to be used as a guideline in construction a dynamic aggregate base and drainage system. Project conditions may vary based on overall scope of work and location.

1 Part I General A. This information is to be used as a guideline in construction a dynamic aggregate base and drainage system. Project conditions may vary based on overall scope of work and location. Any variations shall be approved by SportsTurf Systems and/or Architect of Record prior to execution. B. This section includes the following: 1. Excavation 2. Aggregate Base Course 3. Drainage 4. Testing C. Scope Narrative - The work inclusive of this section is to be completed per the Contract Documents and is to include all labor, materials, equipment, supervision and all other incidentals necessary for a complete professional finished product. All local guidelines and applicable laws must be adhered to throughout the duration of the project. Remove and legally dispose of all unnecessary materials to achieve subgrade. Place aggregate, drainage and geotextile material as directed to achieve final grade. (Note: Geotechnical evaluation to be provided by Owner) D. Submittals The following submittals are required for approval prior to installation: 1. Permeable geotextile fabric product data 2. Permeable geotextile fabric test reports 3. Collector piping and accessories product data 4. Flat drain product data 5. Collector drain backfill material sieve analysis 6. Aggregate base course sieve analysis 7. Aggregate finish course sieve analysis 8. Supplier list 9. Aggregate material certifications Aggregate supplier must certify that all material delivered to site meets requirements as specified herein.

2 Part II Products A. Geotextile Fabric 1. Description The proposed fabric must consist of woven long-chain polymeric yarns. The yarns must be fabricated of 95% propylene or ester polymers. 2. Acceptable Manufacturers a. Mirafi b. Amoco c. Approved equal 3. Required Test Criteria The fabric must meet the following test parameters: Minimum Unit of Test Description Requirement Measurement Reference Wide Width Tensile Strength 175 lbs./in. ASTM D-4595 Grab Tensile Strength 315 lbs. ASTM D-4632 Grab Tensile Elongation 15 percent (%) ASTM D-4632 Trapezoid Tear Strength 120 lbs. ASTM D-4533 Mullen Burst Strength 600 psi ASTM D-3786 Puncture Strength 145 lbs. ASTM D-4833 Percent Open Area 1 percent (%) COE Apparent Opening Size mm ASTM D-4751 Permittivity 0.05 sec -1 ASTM D-4491 Flow Rate 163 gal/min/ft 2 ASTM D-4491 UV Resistance (at 500 hours) 70 % strength retained ASTM D-4355 B. Collector Piping 1. Description HDPE (High Density Polyethylene) corrugated piping. Perforated, smooth wall tubular style and required fittings. Size requirements are to be indicated in Contract Documents. Pipe to meet ASTM D3350 and AASHTO M252. a. Acceptable ManufacturersADS N-12 b. Hancor c. Approved equal

3 C. Flat Drain Piping 1. Description Perforated plastic core pipe with a 12 inch wide 1.5 inch tall profile. Flat drain to be wrapped in geotextile fabric. 2. Acceptable Manufacturers a. ADS AdvanEDGE b. Enkaturf Drain as manufactured by Colbond c. Approved equal D. Trench Backfill Aggregate 1. Description Angular, washed free draining stone with a uniform ¾" diameter. Other products native to region may be utilized in this application only. E. Aggregate Base Course 1. Description Angular, unwashed aggregate consisting of crushed limestone that must be placed and compacted in a uniform manner. Rounded stone is not permitted for this application. Aggregate must be tested by an independent party prior to delivery to site and must meet and/or exceed the specifications as provided herein. Please see Part III for correct application. Other products of similar consistency native to region of project may be considered and approved by SportsTurf Systems. 2. Design Criteria a. Sieve Analysis Sieve Dimension % Passing by Weight 1.5" " ¾" ½" # # b. Permeability - > 50 in./hr. c. Sulfate Soundness (C-88) - < 12% loss

4 d. Compaction 92-95% of maximum density as determined by ASTM D e. Optimum moisture content - > 90% F. Aggregate Finish Course 1. Description Angular, unwashed aggregate consisting of crushed limestone that must be placed and compacted in a uniform manner. Rounded stone is not permitted for this application. Compacted depth not to exceed 1". Aggregate must be tested by an independent party prior to delivery to site and must meet and/or exceed the specifications as provided herein. Please see Part III for correct application. Other products of similar consistency native to region of project may be considered and approved by SportsTurf Systems. 2. Design Criteria a. Sieve Analysis Sieve Dimension % Passing by Weight ¼" # # # # b. Permeability - > 12 in./hr. c. Sulfate Soundness (C-88) - < 12% loss d. LA Abrasion (ASTM C131) - < 40 e. Compaction 92-95% of maximum density as determined by ASTM D f. Optimum moisture content - > 90% Part III Execution A. General All activities are to be sequenced properly and completed in a timely fashion. All measures must be taken to ensure a safe jobsite per all applicable guidelines. All existing conditions and/or new work in place within the job limits

5 must be maintained at all times. Any damage to said materials will be the sole responsibility of the site work contractor. B. Excavation 1. Survey Solicit the services of a licensed surveyor to establish grade and control points necessary to complete the scope of work. Maintain such markings throughout the duration of the project. (Note: This may be provided by Owner. Please reference Contract Documents for verification) 2. Identify and mark all underground utilities prior to commencement or work. Utilize the services of a utility locating company if available. 3. Track Bridging If an existing track is in place proper track bridging must be in place prior to removal. Method of track bridging to be approved by SportsTurf Systems and Owner prior to commencement. 4. Removal a. Saw cut edge of existing track, if applicable, to achieve a uniform perimeter. b. Remove all trees, shrubs, plant material and all natural vegetation and legally dispose of. If an existing structure is present within the job limits, disconnect all utilities and relocate or completely demolish as indicated in the Contract Documents. c. Remove soils to a depth as indicated in the Contract Documents and legally dispose of or spoil on site in a location determined by Owner. Grade and shape subgrade to a 0.5% pitch from the centerline of the field (longitudinal) to the proposed edge of the excavation. Subgrade must be free of all roots, debris, etc. d. Any additional excavation, without the written direction of the Owner, will be the sole responsibility of this contractor. Do not proceed with additional

6 e. excavation unless authorized. If additional excavation is approved, engineered fill will be required in place of unsuitable soils. f. Any necessary dewatering will be the responsibility of this contractor. g. If contaminated soils, or potentially contaminated soils, are exposed during the excavation all work is to stop immediately and the condition is to be communicated to the Owner. 5. Laser Grading Laser guided machinery will be required to achieve the subgrade elevation as indicated on the Contract Documents. Subgrade must be achieved by laser grading to a ½" tolerance over a twenty-five foot continuous span. The subgrade must be compacted to achieve 95% of the maximum density as determined by ASTM D 698. Subgrade must have the required planarity to mirror that of the finished aggregate. 6. Testing a. This contractor will be required to conduct a proof roll of the subgrade prior to approval. This is to be witnessed by an independent soils engineer (by Owner) and the Architect. If an area is determined to be unsuitable, at the direction of the Owner, remove the unsuitable soil to a depth determined acceptable by the soils engineer. Engineered fill will be required in place of the unsuitable soil. Proof roll area again in the presence of the soils engineer and architect. b. Soils Engineer is to test for compaction prior to proceeding. C. Geotextile Fabric a. Geotextile fabric must be delivered to site in manufacturer's wrapping and must stay wrapped until placement. b. Do not commence installation unless subgrade has been approved c. Geotextile fabric must be overlapped per the manufacturer's recommendations. d. If geotextile fabric becomes damaged during installation remove, replace and/or patch per manufacturer's recommendations. e. Do not leave geotextile fabric exposed to the elements for more than fourteen days. Aggregate is to be placed within that time frame.

7 D. Drainage a. Collector Drain 1. Collector drain is to be 8 inches, or as indicated on the Contract Documents. 2. Pipe to be installed at 0.5% to allow for drainage. Location of outlet structure must be determined prior to installation. The point closest to the outlet structure will be the low point of the pipe within the excavation perimeter. 3. The trench for the collector drain must be lined independently with geotextile fabric allowing on overlap from the field. 4. Free draining stone must be placed and compacted properly around the collector pipe to the elevation of the subgrade. 5. All connections are to be made with the manufacturer's recommendations 6. Damaged piping is not be utilized and will be removed from site. 7. Photo documentation of this process will be required. b. Flat Drain 1. Flat drains are to be placed flat at a 45 degree angle at 25' O.C. over geotextile fabric. This is a "herringbone" layout. 2. In order to protect the flat drains, cover with aggregate as soon as possible. 3. Mechanical connection to collector drain is not required. Flat drains must be placed adjacent to collector drain per detail. 5. Aggregate Base Course a. Place only approved aggregate to a depth as indicated in the Contract Documents. b. Do not drive equipment over geotextile fabric in place. c. Do not stockpile material in a central location and move to perimeter. Material shall not be moved more than 50 feet from final location. Failure to do so will result in a separation of the gradations and a general lack of uniformity in the base.

8 d. Laser guided machinery will be required to achieve the subgrade elevation as indicated on the Contract Documents. Laser grade to a ¼" tolerance over a twenty five foot continuous span. A 0.5% slope from centerline of field to nailer must be maintained. The subgrade must be compacted to achieve 95% of the maximum density as determined by ASTM D 698. Subgrade must have the required planarity to mirror that of the finish course. e. Compaction is to be achieved by using a vibratory roller. 7. Aggregate Finish Course a. Place only approved aggregate to a depth of no more than 1" once compacted. b. A broadcast method is preferred for this application. c. Compaction is to be achieved by using a vibratory roller. Aggregate shall be wetted during the compaction process. The finished course shall be free of all impressions, roller marks, etc. d. Laser grade to achieve the desired elevation to a tolerance of 1/8" over a 25 foot continuous span. Failure to achieve such requirements will result in regrading the unacceptable areas of the base. e. Solicit the services of a licensed surveyor to verify elevations and planarity. Results shall be made available to SportsTurf Systems. f. Prior to demobilization, SportsTurf Systems must approve the finish course. Site contractor may leave no more than ½ yard of finish course aggregate for repairs.

CITY OF FARGO SPECIFICATIONS GEOTEXTILES AND GEOGRIDS

CITY OF FARGO SPECIFICATIONS GEOTEXTILES AND GEOGRIDS GEOTEXTILES AND GEOGRIDS PART 1 DESCRIPTION OF WORK The work to be done under this section of the Specifications and the accompanying plans consists of all labor, material, accessories, and equipment necessary