Section 02710 - Subdrainage System

SECTION 02710 - SUBDRAINAGE SYSTEM

PART 1 - GENERAL

1.1 DESCRIPTION

Provide sub-soil drainage piping, trenching for drainage piping, filter fabric, aggregate backfill and drainage course.

SEE CIVIL AND LANDSCAPE DRAWINGS FOR THE SIZE, LOCATION AND CHARACTER OF THESE ELEMENTS

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. Earthwork - Section 02200.

B. Landscaping - Section 02900.

1.3 QUALITY ASSURANCE

A. Applicator: Minimum 2 years experience installing similar type subdrainage system.

B. Reference Standards (latest edition):

ASTM C-33 - Concrete Aggregate

1.4 SUBMITTALS

A. Product Data: Submit manufacturer's descriptive literature and installation instructions for each product in accordance with Section 01340.

B. Certification: Submit manufacturer's certification that products meet specification requirements.

1.5 JOB CONDITIONS

A. Soil Classification: Excavated materials shall not be classified with reference to type, and the term excavation shall include all material encountered at the site without regard to its physical properties, characteristics or composition.

B. Protection: Provide dewatering and drainage necessary to keep excavation free of water. C. Coordination subdrainage systems with installation of concrete structures, water proofing and related backfill operations.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Subsoil Drain Pipe:

1. Qualities: Heavy duty corrugated polyethylene tubing - perforated and nonperforated, as required, with factory fabricated fittings. 2. Standard: ASTM F-405 3. Source: ADS - Advanced Drainage Systems, Inc., Ennis, Texas (214) 875-6591.

B. Filter Aggregate: Clean, hard, durable crushed rock meeting requirements of ASTM C-33 - coarse aggregate section, one to 1/2 inch size.

C. Granular Fill: Clean, hard, durable crushed rock meeting requirements of ASTM C-33 - coarse aggregate section, 2 inch to 1 inch size.

D. Filter Fabric: "Yellow Jacket", No., 990-06 glass fabric by Flintkote Company, East Rutherford, New Jersey or Mirafi 140N by Celanese Corporation and distributed locally by Lofland Co., (214) 631-5250.

E. Underground Warning Tape for Buried Lines: Three inch wide metallic core brightly colored polyethylene detection tape.

PART 3 - EXECUTION

3.1 INSPECTION AND PREPARATION

A. General:

1. Verify that preceding work has been satisfactorily completed. 2. Verify that forms, trash and debris have been removed. 3. Do not proceed until conditions are satisfactory.

B. Trench Excavation

1. Excavate trenches for subsoil drainage pipe to lines, grades, elevations and widths detailed. 2. Do not over-excavate.

3. Exercise care not to disturb soil at bottom of trenches.

C. Subsoil Drainage Pipe Installation for Tree Openings:

1. Place filter fabric in bottom of trench and extend up the sides equal to the depth of the aggregate and width of the trench.

2. Place bottom layer of granular fill over filter fabric to elevation of pipe bottom.

3. Place pipe sections on granular fill and complete joints and fittings in accordance with manufacturer's directions.

4. Insure that pipe is installed at correct elevations.

5. Leave piping installation complete and ready for granular fill backfill.

6. Refer to drawings to determine where non-perforated and perforated pipe is required.

7. After subsoil drainage pipe installation id complete, place granular fill around sides of pipe and tamp solid without disturbing pipe positions.

8. Place additional granular fill over top of drainage pipe to levels detailed.

9. Cover top of granular fill with filter fabric. Lap joints in accordance with manufacturer's directions to provide continuous wrapped coverage of fabric around granular fill.

D. Subsoil Drainage Pipe Installation (Standard Condition)

1. Bedding for pipe shall provide a firm foundation of uniform density throughout the entire length of pipe. The exterior of the pipe for not less than 1/4 of its circumference shall be embedded in an earth foundation of uniform density accurately shaped to fit the outside of the pipe material used for bedding from on site excavation. When rock is encountered grade and install tamped earth from the excavation to achieve desired grade.

2. No pipe shall be laid in a wet trench. Maintain all trenches free of water.

3. No pipe shall be laid until it has been inspected and approved. The pipe shall be laid upgrade beginning at the lower end of the line.

4. Use manufacturer's standard couplers to make all connections.

5. After the pipe has been installed, material from the on-site excavation at a moisture content to obtain required density, shall be placed equally along both sides of the pipe in layers not exceeding six (6) inches loose depth. Compact each layer thoroughly by hand or pneumatic tampers to finish grade.

3.2 CLEAN UP

Remove all debris, spoil and materials from site after completion.

END OF SECTION 02710