SECTION 010000 - DP&R SPEC TEMPLATE



SECTION 33 46 00 SUBDRAINAGE SYSTEMS

GENERAL

1. RELATED DOCUMENTS

A. Contract Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

B. Related Report Documentation

***Edit list of applicable documents***

1.

2. City and County of Denver - Regulated Asbestos Contaminated Soil Standard Operating Procedure (RACS SOP), Denver Department of Public Health and Environment (DDPHE) – Environmental Quality Division, May 2, 2019 (see Appendix).

3. [City and County of Denver – Standard Materials Management Plan (MMP), Denver Department of Public Health and Environment (DDPHE) – Environmental Quality Division, November 13, 2019 (see Appendix).]

4. City and County of Denver – Guidance for Reuse of Soil on City Projects, Denver Department of Environmental Health – Environmental Quality Division, October 5, 2017 (see Appendix).

2. SUMMARY

A. This Section includes requirements for furnishing and installation of sub-drainage systems as shown on the Contract Drawings, as specified herein, or as required to complete the work.

A. Related Sections: [REMOVE ANY OF THE SECTIONS BELOW THAT DO NOT APPLY]

***EDIT FOLLOWING LIST AS NECESSARY TO REFLECT PROJECT CONDITIONS.***

1.

2. Division 01 Section “Contractor Quality Control”.

3. Division 01 Section “Erosion and Sedimentation Control”.

4. Division 01 Section “Materials and Equipment”.

5. Division 01 Section “ Operation and Maintenance Data”.

6. Division 01 Section “Contract Record Documents”.

7. Division 01 Section “Tree Retention and Protection”.

8. Division 31 Section “Earth Moving”.

9. Division 31 Section “Excavation and Backfilling of Trenches”.

10. Division 32 Section “Sodding”.

11. Division 33 Section “Storm Sewerage”.

3. SUBMITTALS

A. See Division 01 Section “Submittals” for submittal requirements.

B. Product Data: For approval on each type of product prior to construction.

1. Piping: Submit twelve inch (12”) length of each type of underdrain piping to be used.

2. Geotextile Fabric: Submit twelve inch (12”) by twelve inch (12”) sample.

3. Bedding material: Submit one (1) quart sample.

4. Filter material: Submit one (1) quart sample.

C. Operation and Maintenance Manual: See Division 01 Section “Operation and Maintenance Data” for manual requirements.

4. CONTRACT RECORD DRAWINGS

A. Prior to the installation of subdrainage system, the Contractor will provide on-site copies of original subdrainage design Contract Drawings “Record Contract Drawings”. Contractor to revise Record Contract Drawings in red ink as Work progresses to show any changes to the plan and include field dimensions. Record Contract Drawings shall be brought up-to-date prior to any Pay Application Submittals that contain subdrainage installation. Should the Contractor choose to utilize GPS for the purposes of documenting Work in progress, a hard copy print will need to be provided prior to Pay Application Submittal. A print of Record Contract Drawings shall be available at Project Site for review by the Project Manager at any time during the project.

B. Record Contract Drawings shall encompass entire scope of work.

C. Preparation of Contract Record Drawings: Provide dimensions from two permanent points of reference (building corners, sidewalk, road intersections or permanent structures) the location and elevation of the following items:

1. Clean-outs

2. Change of Direction

3. Inlets / Outlets

4. Catch Basins

D. Make dimensions accurately at the same scale used in the original Contract Drawings, or larger. Notes and dimension lettering must be legible.

E. The Project Manager will not certify any pay request submitted by the Contractor if the Contract Record Drawings are not current, and processing of pay request will not occur until Contract Record Drawings are updated.

F. Final Submittal: Upon completion of Project, prior to final acceptance, secure digital copy of grading design from the Project Manager and record installation information that reflects all changes made over the course of the construction project, prepared by a qualified draftsperson. Contract Record Drawings shall include details of any revisions as per actual installation. Deliver and submit to the Project Manager for review the following items:

1. Digital Contract Record Drawings in both PDF and AutoCAD release 2010 or newer bound format (include any related X-ref files, plot files and pen settings.) Make any additional changes to the file as directed by the Project Manager prior to final submittal and approval.

G. Request for final payment will not be certified or processed until all Contract Record Drawing prints and digital files have been received and approved.

5. DELIVERY, STORAGE, AND HANDLING

A. Materials: Deliver materials in original containers. Protect materials from damage during delivery and while stored at site. The Project Manager reserves the right to inspect containers before or after installation to verify compliance with Specifications.

B. Bulk Materials:

1. Do not dump or store bulk materials near structures, utilities, walkways and pavements, or on existing turf areas or plants.

2. Provide erosion-control measures to prevent erosion or displacement of bulk materials; discharge of soil-bearing water runoff; and airborne dust reaching adjacent properties, water conveyance systems, or walkways.

3. Accompany each delivery of bulk materials with appropriate certificates.

4. Protect piping and geotextile fabric from damage or contamination with soil or other construction materials from time of deliver to installation.

6. PROJECT/SITE CONDITIONS

A. Field Measurements: Verify actual grade elevations, service and utility locations, irrigation system components, and dimensions of plantings and related construction contiguous with proposed subdrainage installations by field measurements before proceeding with installation of the subdrainage system.

PRODUCTS

7. MATERIALS

***EDIT FOLLOWING LIST AS NECESSARY TO REFLECT PROJECT CONDITIONS***

A.

1. Bedding Material: Maximum one quarter-inch (1/4”) squeegee material, shall be free of shale, lay, friable materials, organics and debris.

B. Vertical Drain System: “Multi-flow Drainage Systems” or approved equal, install per manufacturer’s recommendations.

C. Geotextile Fabric: Non-woven fabric “140N” by Tencate-Mirafi or acceptable substitution.

D. Bedding Material: Maximum one-quarter inch (1/4”) squeegee material, shall be free of shale, lay, friable materials, organics, and debris.

EXECUTION

8. INSTALLATION

A. Examine areas where the Work of this Section will be performed for compliance with requirements and conditions affecting installation and performance.

1. Verify that no foreign or deleterious material or liquid such as paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline, diesel fuel, paint thinner, turpentine, tar, roofing compound, or acid has been deposited in soil within the work area.

2. Verify that final grades are completed in accordance with the drawings.

B. Proceed with installation only after unsatisfactory conditions have been corrected and approved by Project Manager.

C. PVC Under Drain: Install pipe under drains as shown on the Contract Drawings. Pitch shall be a minimum of one half of one percent (0.5%) or as shown on Contract Drawings. Contractor is responsible to immediately notify the Project Manager of any discrepancies.

D. Vertical Drain System: Install “Multi-flow Drainage System” or approved equal as shown on the Contract Drawings. The amount of trench excavated at any time shall not exceed the amount of drain that can be set and backfilled completely in one (1) working day. The trench shall be four inches (4”) wide and at the depth specified in the plans. The collection system shall be centered in the trench and backfilled with bedding material. Collection system fittings shall be installed per manufacturer’s recommendations.

E. Solid Pipe: Refer to the City and County of Denver Wastewater Storm Drainage and Sanitary Construction details and specifications document available at the following website:



F. Geotextile fabric used for the pipe under drains system shall be placed in the trench once pipe trench is prepared to receive pipe. The fabric shall be placed in full contact with the trench bottom and sides. The fabric shall be secured to the trench sides or top edge in a manner which does not damage the integrity of the fabric. The fabric shall be protected from damage during the placement of the pipe and granular fill. Install granular fill and pipe in trench to dimensions specified on Contract Drawings. Contractor is responsible to ensure that no debris, sediment or foreign material enters the granular fill that inhibit drainage. Any installation that does not meet these standards shall be replaced at the direction of the Project Manager at no additional cost to the City. Fabric edges shall overlap at least 6-inches (6”) for the full width of the trench.

9. CLEANING

A. Clean and flush out lines before covering. Remove and legally dispose of all waste material and debris offsite.

B. Restore all fences, ditches, yards, lawns, and other structures or surfaces to a condition equal to or better than before work began.

10. PROTECTION

A. Restrict access to subdrainage installation. Erect temporary fencing or barricades and install warning signs as required or directed by the Project Manager at no additional cost to the City.

MEASUREMENT AND PAYMENT

11. MEASUREMENT [Consultant to select A or B]

A. Measurement will be based on the percentage complete for the lump sum contract amount for Subdrainage Systems.

B. Measurement will be made by the contract unit specified for Subdrainage Systems.  Measurement shall include the actual number of units of specified material(s) placed and accepted at the locations shown on the Contract Drawings, or as directed by the Project Manager, and in accordance with the Specifications.

12. PAYMENT

A. Payment will be made at the [contract unit] [lump sum contract] price, and shall include required materials, transportation, equipment, labor, excavation, stockpiling, disposing, hauling off, associated fittings, joints, joint materials, trenching, bedding materials, connections to other pipes or structures, compaction watering, dust control, erosion and sediment control, fine grading, as required in accordance with the Contract Drawings and Specifications.

***REVISE AS NEEDED, AND AS DIRECTED BY THE PROJECT MANAGER***

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