orlando utilities commission bid documents and specifications

Orlando Utilities Commission Bid Documents and Specifications Stanton Energy Center Page 1 of 2 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________

BID DOCUMENTS AND SPECIFICATIONS TABLE OF CONTENTS

COMBUSTION WASTE STORAGE AREA RUNOFF POND SOIL BENTONITE CUT-OFF WALL

ORLANDO UTILITIES COMMISSION

STANTON ENERGY CENTER ORANGE COUNTY, FLORIDA

Attachment Description

I INVITATION TO BID AND BIDDERS INSTRUCTIONS

1. Name of Project 2. Location 3. Description of Work 4. Contractor’s Qualifications 5. Examination of Bid Documents and Site 6. Subcontractors and Suppliers/Manufacturers 7. Pre-Bid Meeting 8. Construction Schedule 9. Correspondence and Bid Submittal 10. Contract 11. Award of Contract 12. Return of Bid Documents

II BID FORM

1. Offer to Perform Work 2. Schedule of Prices 3. Subcontractors 4. Source of Bentonite 5. Suppliers and Manufacturers 6. Substitute Items 7. Construction Schedule 8. Required Submittals 9. Method of Payment

Orlando Utilities Commission Bid Documents and Specifications Stanton Energy Center Page 2 of 2 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ Attachment Description

III SPECIFICATIONS

1. List of Specification Sections 2. Intent 3. List of Drawings 4. Contractor’s Understanding 5. General Requirements and Provisions 6. General Earthwork 7. Cut-Off Wall Construction 8. Cut-Off Wall Quality Assurance Inspection and Testing 9. Woven Geotextile 10. Daily and Final Clean-Up 11. Site Limitations 12. General Provisions 13. Construction Schedule 14. Final Inspection and Acceptance 15. Scheduling and Coordination

IV OUC GENERAL CONDITIONS OF CONSTRUCTION CONTRACT

V SITE SAFETY RULES VI INFORMATION TO BIDDERS

C:\Projects\12\113-12-13-0166 -OUC CWSA POND\Cutoff Wall Specifications\OUC-CWSA Runoff Pond Cut-Off Wall Specs-P0-041713.doc

Attachment I

INVITATION TO BID AND BIDDERS INSTRUCTIONS




Orlando Utilities Commission Invitation to Bid and Bidders Instructions Stanton Energy Center Page 1 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ ATTACHMENT I

INVITATION TO BID AND BIDDERS INSTRUCTIONS




1. NAME OF PROJECT Combustion Waste Storage Area Runoff Pond Soil Bentonite Cut-Off Wall. 2. LOCATION Construction will be undertaken on the west side of the Orlando Utilities Commission (OUC), Stanton Energy Center (SEC), which is located in southeastern Orange County, Florida in the vicinity of the Econlockhatchee River, about 12 miles southeast of downtown Orlando and 6 miles northeast of Orlando International Airport. The site is located within Sections 13, 14, 23, and 24 of Township 23 South, Range 31 East, and Sections 7, 18, and 19 of Township 23 South, Range 32. The address of the facility is 5100 South Alafaya Trail, Orlando, Florida. Alafaya Trail ends at the site entrance. The site is north of the Beach Line Expressway (State Road 528) and east of Innovation Way, which provides access from Alafaya Trail to State Road 528. The site boundary encompasses an area of approximately 3,100 acres. 3. DESCRIPTION OF WORK The work consists of furnishing all labor, materials, plant, equipment, tools, supervisory personnel, and Contractor's facilities needed to install a soil-bentonite cut-off wall to the lines, grades and dimensions shown on the Drawings. The work includes the following:

General Earthwork, including: installation of silt fence; clearing, stripping and grubbing of vegetation; trench excavation for utility clearance; dewatering; surface water control and conveyance; excavation; hauling excess soil; and borrowing, moisture conditioning, placing and compacting earthen materials for site grading.

Utility Demolition/Removal, including: demolition/removal and plugging/capping of existing 6” diameter underdrain pipes, 24” and 36” diameter RCP outlet and inlet pipes and associated inlet headwall.

Cut-Off Wall Installation, including: installation of approximately 158,000 square feet of soil-

bentonite cut-off wall and an overlying soil cap along an approximately 2,500-foot long

Orlando Utilities Commission Invitation to Bid and Bidders Instructions Stanton Energy Center Page 2 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________

alignment to the lines, grades and dimensions shown on the Drawings. The cut-off wall will extend vertically from final grade elevation of 87 feet (NAVD), and will be keyed not less than 3 feet into the underlying bedclay formation, with total wall depths ranging from about 60 to 75 feet. The cut-off wall will have a minimum thickness of 2.5 feet, an in situ soil-bentonite backfill hydraulic conductivity equal to or less than 1.0x10-7 cm/sec, and a minimum dry bentonite addition of 4.0 percent by dry weight of soil. The cut-off wall shall be installed by the slurry trench method of construction using slurry with a density that equal to the specified minimum density or the minimum density required to maintain a stable trench, whichever is greater.

The work will be performed in near proximity to the existing Combustion Waste Storage Area (CWSA) landfill, CWSA runoff pond and environmentally sensitive areas located to the north, south and east of the project site. The Contractor shall properly maintain the work area as needed through the use of silt fence and soil berms to prevent runoff or the release of any bentonite slurry, trench backfill materials or eroded soils into the recharge ditch or adjoining undisturbed areas. The cut-off wall will be installed through fill and natural ground soil materials. Considerable variation in the composition and consistency of the existing fill materials and natural ground soils may be encountered throughout the depth of the cut-off wall excavation. Available subsurface data and the results of test borings performed along the cut-off wall alignment are contained in the Drawings and Bid Documents. The Contractor shall carefully examine the Drawings and Information to Bidders and fully satisfy himself of the nature and variability of the subsurface soils and excavation depths along the length of the cut-off wall alignment. It is understood and agreed by the Contractor that groundwater at the site has been impacted by past plant operations. Groundwater pH is in the range of 3.7 to 3.9 and total dissolved solids concentrations are in the range of 1,300 to 2,300 mg/l. Available groundwater quality data are presented in the Information to Bidders. Ancillary work shall include but is not limited to: (i) surveying; (ii) demolition and incidental removal of debris or foreign objects from within the limits of construction; (iii) construction and maintenance of access roads;(iv) repair to any OUC facilities, utilities, equipment or property damaged by the Contractor; (v) hauling and spraying water to control dusting; (vi) dewatering and control of surface water runoff; (vii) excavating and backfilling dewatering ditches; (viii) construction and maintenance of staging areas; (ix) earthwork required to excavate slurry mixing ponds; (x) earthwork required to backfill and abandon slurry mixing ponds following completion of the work; (xi) maintenance of working pads and construction of containment berms, as needed to prevent runoff or the release of bentonite slurry, trench backfill materials or eroded soils from the work pad; (xii) disposal of all unsuitable soil excavated from the slurry trench and remaining unused bentonite slurry; (xiii) earthwork required to restore ground surfaces disturbed as a result of construction activities; (xiv) maintenance of completed work until accepted by the Owner; and (xv) final site clean-up. The Contractor shall coordinate work activities with the Owner and Subcontractors involved in the project to maintain the required construction schedule. 4. CONTRACTOR’S QUALIFICATIONS To be considered qualified for this project, the Contractor and all designated Subcontractors, as applicable, must be well experienced and knowledgeable in the installation of soil-bentonite cut-off

Orlando Utilities Commission Invitation to Bid and Bidders Instructions Stanton Energy Center Page 3 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ walls constructed using the slurry trench method of construction; site grading; general earthwork; and installation of HDPE pipe. Failure to meet or exceed the minimum qualifications and/or failure to provide documentation to the Owner, which clearly and beyond reasonable doubt verifies the Bidder's qualifications, shall constitute grounds for rejection of the bid. 4.1 Earthwork Earthwork must be performed by a contractor well experienced in earthwork, and must, at a minimum, demonstrate the successful completion of at least three projects similar in size and scope to this project. The Contractor must be well experienced in earthwork construction related to site grading, installation of HDPE drain pipe, and drainage culverts. The Contractor must also be well experienced in dewatering, and moisture conditioning and compacting earthen materials. For each project submitted to document experience, the following information on the completed facility must be provided with the supporting information for the Bid:

Name and purpose of facility, location, and date of construction.

Name of Owner and Engineer, and name and telephone number of contact at the facility who can discuss the project.

Description of the facility (e.g., volume of earthwork, type of drain and drainage structures,

etc.) The Contractor must designate a Site Supervisor for this project who has supervised construction of a minimum of three projects of similar size and scope. Resumes and qualifications of the Contractor’s designated Project Manager and Site Supervisor(s) must be included with the supporting information for the Bid. 4.2 Cut-Off Wall Installation Each Bidder must, at a minimum, demonstrate the successful installation of at least three soil-bentonite backfill cut-off walls completed over the past 3 years and totaling at least 1,000,000 square feet, including installation of at least one cut-off wall in hard soil/rock and at least one installation with depths of penetration in as deep as 75 feet. Particular consideration will be given to the Contractor's experience in slurry trench excavation at similar depths as required for this project. For each installation submitted to document this minimum experience, the following information on the completed facility must be provided by the Bidder with the bid package:

Name and purpose of facility, location, and date of installation.

Name of Owner and Engineer, and name and telephone number of contact at the facility who can discuss the project.

Description of the facility (e.g., depth of excavation, width, length, type of soil/rock

excavation, type of backfill, hydraulic conductivity of the backfill, equipment used, etc.).

Orlando Utilities Commission Invitation to Bid and Bidders Instructions Stanton Energy Center Page 4 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ The Contractor must designate a Site Supervisor for this project who has supervised a minimum of three soil-bentonite cut-off wall installations similar in size and scope. Resumes and qualifications of the Contractor’s designated Project Manager and Site Supervisor(s) must be included with the supporting information for the Bid. Failure to meet the minimum qualifications and/or failure to provide documentation to the Owner, which clearly and beyond reasonable doubt verifies the Bidder’s qualifications, shall constitute grounds for rejection of the bid. 5. EXAMINATION OF BID DOCUMENTS AND SITE Before submitting a Bid, each Bidder must: (i) examine the Drawings and Specifications thoroughly; (ii) attend the site visit and pre-bid meeting to familiarize himself with local conditions that may in any manner affect cost, progress, or performance of the work; (iii) consider federal, state and local laws, ordinances, rules and regulations, and site specific contractor safety regulations that may in any manner affect cost, progress, or performance of the work; (iv) study and carefully correlate Bidder's observations with the Drawings and Specifications; and (v) notify the Engineer in writing of all conflicts, errors, or discrepancies in the Drawings and Specifications. A Bidder’s submittal of a Bid shall constitute an acknowledgment that the Bidder has fully complied with the foregoing requirements prior to the submission of a Bid. All questions about the meaning or intent of Drawings and Specifications are to be directed to the Engineer. Interpretations or clarifications considered necessary by the Engineer in response to such questions will be issued by addenda and mailed or delivered to all parties recorded by Engineer as having received the Bid Documents. Questions received less than 5 days prior to the date for opening of bids may not be answered. Only questions answered by formal written addenda will be binding. Oral and other interpretations or clarifications will be without legal effect. Addenda may also be issued to modify the Bid Documents as deemed advisable by the Engineer. Complete sets of the Bid Documents shall be used in preparing the bid. The Owner and Engineer assume no responsibility for errors or misinterpretations resulting from a Bidder’s use of incomplete Bid Documents. If the Bidder does not feel the project can be completed using the transmitted Drawings and Specifications, he/she should advise the Engineer and Owner before his/her Bid is submitted or decline to bid. 6. SUBCONTRACTORS AND SUPPLIERS/MANUFACTURERS Bidders shall provide a list, for approval, of all Subcontractors and Suppliers/ Manufacturers that will be used in the execution of the work, both on-site and off-site. This list must be submitted as part of the supporting information for the Bid. If the Owner has reasonable objection to any proposed Subcontractor, Supplier/Manufacturer or other person or organization, the Owner may, before the Notice of Award is given, request that the apparent successful Bidder submit an acceptable substitute. If the apparent successful Bidder declines to make any such substitution, the contract may be awarded to another Bidder or the contract may not be awarded to any Bidder.

Orlando Utilities Commission Invitation to Bid and Bidders Instructions Stanton Energy Center Page 5 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ 7. PRE-BID MEETING A mandatory pre-bid meeting will be conducted to discuss the scope of the project and visit the work site on May 15, 2013 at 1:00 p.m. at Ardaman & Associates, Inc., 8008 South Orange Avenue, Orlando, Florida 32809. The Bidder must attend the pre-bid meeting to qualify to submit a bid. 8. CONSTRUCTION SCHEDULE A proposed construction schedule consisting of a bar chart showing the sequence of construction activities shall be included by the Bidder in the supporting information for the Bid. The schedule shall be prepared using Microsoft Project scheduling software or other software 100 percent compatible with Microsoft Project, unless approved otherwise by the Engineer and Owner, and shall include all aspects of the scope of work described herein, in the Specifications, and shown on the Drawings. The proposed start/completion dates for each work task shall be shown on the schedule. Time is of the essence and the Contractor's proposed schedule will be considered in the bid evaluation. The Contractor must complete all work within 75 calendar days after award of the Contract. 9. CORRESPONDENCE AND BID SUBMITTAL The completed Bid Form, including completed Schedules A and B in Attachment II, may either be submitted by regular mail, email or hand delivery to the Owner’s representative (Tetra Tech) on May 31, 2013 by 12:00 noon at the following address:

Mailing Address: 201 East Pine Street., Suite 900 Orlando, Florida 32801 Attention: Mr. Sean Rome Telephone: 407-839-3955 Facsimile: 407-839-3790 E-mail: [email protected]

All supporting information for the bid, including list of suppliers and subcontractors, substitute items, construction schedule, and other required submittals (per Section 9 of the Bid Form) shall be submitted at the same time to the Owner and Engineer.

Owner Mailing Address: Orlando Utilities Commission

Stanton Energy Center 5100 Alafaya Trail Orlando, FL 32831-2005

Attention: Mr. Charlie Doud, P.E.

Telephone: 407-434-4289 (office); 407-719-6055 (cell)

Orlando Utilities Commission Invitation to Bid and Bidders Instructions Stanton Energy Center Page 6 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ E-mail: [email protected]

Engineer Ardaman & Associates, Inc.

Post Office Box 593003 Orlando, Florida 32859-3003

Package Delivery: 8008 South Orange Avenue Orlando, Florida 32809

Attention: Mr. Mohamad Al-hawaree, P.E. Telephone: 407-855-3860 Cell: 407-467-8282

Facsimile: 407-859-8121 E-mail: [email protected]

All technical questions regarding this project should be directed to the Owner and Engineer. All contractual questions regarding this project should be directed to the Owner. By submission of a Bid, the bidder acknowledges and represents that the Trench Safety Standards in effect at the time of the Bid and at the time of performing the work shall be adhered to and compliance is the complete and sole responsibility of the Bidder. 10. CONTRACT The text of the basic fixed price contract that will be entered into by the Owner with the successful bidder will be provided by the Owner. 11. AWARD OF CONTRACT The Contract will be awarded to the selected Bidder(s) on or about June 24, 2013. Construction shall begin within 14 calendar days of the Contract award date. 12. RETURN OF BID DOCUMENTS The Bid Documents are the property of OUC and shall only be used by the Bidder for the purpose for which they are supplied. The Bid Documents shall not be copied or reproduced and the information contained therein shall not be furnished in whole or in part to others unless authorized by OUC. Upon notification, all unsuccessful Bidders will be required to return the Bid Documents to OUC.

Attachment II

BID FORM




Orlando Utilities Commission Bid Form Stanton Energy Center Page 1 of 8 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________

ATTACHMENT II

BID FORM




1. OFFER TO PERFORM WORK Having carefully examined the Drawings and Specifications, having visited the site of the proposed work, and being familiar with the various conditions affecting the proposed work, the undersigned offers to perform the work specified for the firm prices quoted on this bid form. In submitting this offer, Bidder accepts all the terms and conditions of the Invitation to Bid and Bidder’s Instructions.

Date: Firm Name:

Signed By:

Signature

Printed Name

Title:

Address:

Area Code: Telephone:

FAX:

Email :

2.0 SCHEDULE OF PRICES The prices quoted must be firm and shall include all tasks required to complete the following work:



Utility Demolition/Removal, including: demolition/removal and plugging/capping of existing

6” diameter underdrain pipes, 24” and 36” diameter RCP outlet and inlet pipes and associated inlet headwall.

Cut-Off Wall Installation, including: installation of approximately 158,000 square feet of soil-

bentonite cut-off wall and an overlying soil cap along an approximately 2,500-foot long alignment to the lines, grades and dimensions shown on the Drawings. The cut-off wall will extend vertically from final grade elevation of 87 feet (NAVD), and will be keyed not less than 3 feet into the underlying bedclay formation, with total wall depths ranging from about 60 to 75 feet. The cut-off wall will have a minimum thickness of 2.5 feet, an in situ soil-bentonite backfill hydraulic conductivity equal to or less than 1.0x10-7 cm/sec, and a minimum dry bentonite addition of 4.0 percent by dry weight of soil. The cut-off wall shall be installed by the slurry trench method of construction using slurry with a density the greater of the specified minimum density or the minimum density required to maintain a stable trench.

Inlets and Outlets Pipes Installation, including: installing two 36-inch diameter HDPE inlet

pipes for stormwater runoff, two 24-inch diameter HDPE inlet pipes from decant cells, and two 24-inch diameter outlet pipes.

The prices quoted must be firm and shall include all tasks required to complete the work. Bidder shall carefully review and examine the method used in estimating quantities and the method of payment, and shall determine his own estimates of quantities independently, before completing the Bid and the Schedule(s) of Prices on the Bid Form. 3. SUBCONTRACTORS Bidder agrees that only the following subcontractors will be used in the completion of the work, and that the subcontractors are qualified to undertake the work required.

Type of Work Name of Subcontractor Telephone Number

General Earthwork

Utility Demolition/Removal, Plugging and Capping

Cut-Off Wall Installation

Inlets and Outlets Pipes Installation

Surveying

No other subcontractors will be allowed to undertake work without the prior written approval of the Owner and Engineer. 4. SOURCE OF BENTONITE Bidder states that he/she expects to use the following bentonite product or mix of bentonite products in the bentonite slurry and the soil-bentonite backfill:

Orlando Utilities Commission Bid Form Stanton Energy Center Page 3 of 8 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ 5. SUPPLIERS AND MANUFACTURERS Bidder states that he expects to use materials from the following Suppliers and/or Manufacturers.

Material Trade Name Designation,

Type, or Series

Name of Supplier/Manufacturer

Telephone Number

Woven Geotextile

24” and 36” HDPE Outlets and Inlets Pipes

Bidder agrees that no other Manufacturers/Suppliers will be used without the prior written approval of the Engineer. 6. SUBSTITUTE ITEMS Substitute items which are included in the Bid shall be described in and provided as part of the supporting information for the Bid. Any substitute item, or exception to the Specifications, must be discussed with the Engineer, Ardaman & Associates, Inc., for written approval prior to submittal of the supporting information for the Bid. 7. CONSTRUCTION SCHEDULE Time is of the essence and the Contractor's proposed schedule will be considered in the bid evaluation. Construction of the entire project must be fully completed and ready for final inspection within 75 calendar days after award of the Contract. 8. REQUIRED SUBMITTALS All requested information and required submittals shall be described and provided as part of the supporting documentation for the Bid. In particular, the supporting information for the Bid shall include, as applicable:

(1) The Contractor's qualifications and demonstrated experience in similar type projects.

(2) Resumes of the Contractor’s designated Project Manager(s) and Site Supervisor(s).

(3) The Contractor’s designated Surveyor.

(4) Subcontractors qualifications and demonstrated experience in similar projects.

(5) Resumes of Subcontractor’s designated Project Manager(s) and Site Supervisor(s).


(6) Proposed excavation equipment to be used for cut-off wall installation.

(7) Proposed location(s) of equipment and material storage, mixing plant, slurry ponds, and mixing areas.

(8) The name of the geotextile Manufacturers and Suppliers, and the proposed product

trade names and/or numbers. (9) The Contractor's independent materials quantity take-off summarized on Schedule B in

Attachment II. (10) Proposed Job Safety Analyses (JSA) associated with all construction activities.

9. METHOD OF PAYMENT The basic fixed price contract to be entered into by the Owner with the successful bidder will supersede any clause contained below if it is deemed to be in conflict with the contract. 9.1 General Payment will be made at the prices bid for work on the Bid Form(s). No measurement for payment will be made for any part of the work except for cut-off wall installation (Items C2, C3 and C4 in the Bid Form). No additional payment will be made on additional work required to re-grade or re-compact soil materials to meet the specification requirements, excavate and replace cut-off wall backfill not meeting specification requirements, repair or replace damaged geotextile, HDPE pipe, or any other materials required to complete the work, or for additional work required to make repairs necessitated by damage caused by the Contractor’s operation. No payment will be made for work performed outside the limits of work authorized by the Owner. If the actual quantity of any item varies from the estimated quantity because of unknown conditions or other reasons, the Contractor shall be entitled to no additional allowance above the lump sum prices provided on the Bid Form. Partial payment shall be requested monthly by the Contractor for the estimated portion of each item completed and tentatively accepted by the Owner. Final payment will only be made after all work has been successfully completed, inspected and accepted. 9.2 Mobilization and Demobilization Payment for mobilization will be made for the entire lump sum amount shown in the Bid Form upon completing the mobilization required to perform the work. The lump sum amount for mobilization shall include all costs of whatsoever nature associated with all other subsequent mobilizations that may be required for performance and completion of the work. Similarly, payment for demobilization will be made for the entire lump sum amount shown on the Bid Form upon final demobilization from the site. The lump sum amount shall include all costs of whatsoever nature associated with all previous demobilizations that may be implemented during performance of the work.

Orlando Utilities Commission Bid Form Stanton Energy Center Page 5 of 8 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ 9.3 Earthwork No measurement for payment for earthwork will be made. Payment for earthwork; site preparation; clearing, stripping and grubbing of vegetation; silt fence installation; trench excavation for utility clearance; dewatering and surface water control; utility demolition/removal, plugging and capping; grassing by seeding; and ancillary earthwork items will be made at the applicable lump sum price bid in the Bid Form. The lump sum prices in the Bid Form shall reflect all other related incidental or ancillary work shown on the Drawings, and/or required by the Specifications. 9.4 Cut-Off Wall Installation Measurement for payment for construction of the cut-off wall shall be based on the completed excavation depth and length, excluding the lead-in trench. Payment will be made for backfilled and completed portions of the cut-off wall at the corresponding unit price per square foot (depth x length) bid in the Bid Form. Payment for over-excavation will not be made unless specifically requested and approved, in writing, by the Owner or the Engineer. No measurement for payment for work pad construction and installation of the soil cap will be made. Payment for these items and ancillary cut-off wall work items will be made at the applicable lump sum price bid in the Bid Form. The lump sum prices in the Bid Form shall reflect all other related incidental or ancillary work shown on the Drawings, and/or required by the Specifications. 9.5 Culvert Pipe Installation No measurement for payments for installation of HDPE drainage culvert pipes will be made. Payment for culvert pipe installation will be made at the applicable lump sum prices shown on the Bid Form. The lump sum prices shall include all other related incidental or ancillary work shown on the Drawings, and/or required by the Specifications. 9.6 Progress Payments Progress payments shall be requested monthly by the Contractor based on estimated quantities of completed portions of the work, subject to approval by the Owner.


SCHEDULE A

BID FORM COMBUSTION WASTE STORAGE AREA RUNOFF POND

SOIL BENTONITE CUT-OFF WALL

Item Description Estimated Quantity

Unit Price Amount

A. MOBILIZATION AND DEMOBILIZATION

A1 Mobilization Lump Lump Sum $__________

A2 Demobilization Lump Lump Sum $__________

B. EARTHWORK

B1 Site clearing, stripping and grubbing of surface vegetation Lump Lump Sum $__________

B2 Silt Fence Installation Lump Lump Sum $__________

B3 Trench Excavation for Utility Clearance Lump Lump Sum $__________

B4 Dewatering and Surface Water Control Lump Lump Sum $__________

B5 Utility Demolition/Removal, Plugging, Capping Lump Lump Sum $__________

B6

Ancillary Work Items (Including Surveying, Access Road Maintenance, Disposing of Demolition Debris, Repairs to OUC Facilities Damaged by Contractor, Dust Control, Maintenance of Completed Work Until Accepted by Owner, Site Clean-Up)

Lump Lump Sum $__________

C. CUT-OFF WALL INSTALLATION

C1 Work Pad Construction Lump Lump Sum $__________

C2 Installation of Soil-Bentonite Cut-Off Wall Up to Depths of 75 feet 158,000 ft2 $_________/ft

2 $__________

C3 Increase in Depth of Cut-off Wall for Item C2 for Depths Greater than 75 feet

Determined During

Construction

$_________/ft2

C4 Decrease in Depth of Cut-off Wall for Item C2 From that shown on the Construction Drawings

Determined During

Construction

$_________/ft2

C5 Installation of Cut-Off Wall Cap Lump Lump Sum $__________

C6

Ancillary Work Items (Including Surveying, Maintenance of Work Pad, Construction of Containment Berms, Construction and Maintenance of Staging Areas, Disposing of Unsuitable Soil Excavated from the Slurry Trench, Disposal of Bentonite Slurry; Site Clean-up)

Lump Lump Sum $__________

D. CULVERT PIPE INSTALLATION

D1 Installing 36-inch and 24-inch diameter HDPE inlet and outlet pipes Lump Lump Sum $__________

E. SAFETY TRAINING AND COMPLIANCE Lump Lump Sum $__________

F. TOTAL BID PRICE - - $__________


SCHEDULE B

CONTRACTOR’S MATERIALS QUANTITY TAKE-OFF COMBUSTION WASTE STORAGE AREA RUNOFF POND


Material Unit Estimated

Quantity from Drawings

Adjusted Quantity to be Purchased

or Hauled*

EARTHWORK

Site Preparation acres ______________

Silt Fence lf ______________ ______________

General Earthwork for Work Pad yd3 ______________ ______________

SOIL BENTONITE CUT-OFF WALL ft2 _____________

CUT-OFF WALL SOIL CAP INSTALLATION

Select Fill Material yd3 _____________ _____________

Random Fill Material yd3 _____________ _____________

Woven Geotextile ft2 _____________ _____________

* Adjusted earthwork quantities shall account for bulking after excavation, shrinkage associated with dewatering and compaction. Adjusted geotextile quantities shall account for overlaps, waste, wrinkles, increased areas due to sloping surfaces, and materials used for testing and repairs.


SCHEDULE C

ENGINEER’S MATERIAL QUANTITY ESTIMATE


Material Unit Estimated Quantity

EARTHWORK

Site Preparation acres 13

Silt Fence lf 4,900

General Earthwork for Work Pad (Cut / Fill) cy / cy 2,500 / 12,750

SOIL-BENTONITE CUT-OFF WALL ft2 158,000

CUT-OFF WALL SOIL CAP INSTALLATION

Random and Select Backfill Materials yd3 1,250

Woven Geotextile ft2 27,500

INLETS AND OUTLETS PIPES

Two 36-inch Diameter HDPE SDR 17 Inlet Pipes lf 200

Two 24-inch Diameter HDPE SDR 17 Inlet Pipes lf 200

Two 24-inch Diameter HDPE SDR 17 Outlet Pipes lf 200

Orlando Utilities Commission Section 1 Stanton Energy Center Page 1 of 1 North Recharge Ditch Closure & Cut-Off Wall Revision P3 File Number 11-13-0128 May 3, 2013 _____________________________________________________________________________ SPECIFICATIONS

SECTION 1 LIST OF SPECIFICATION SECTIONS




Section Title Pages

1 List of Specification Sections 1

2 Intent 2

3 List of Drawings 1

4 Contractor’s Understanding 2

5 General Requirements and Provisions 6

6 General Earthwork 4

7 Cut-Off Wall Construction 7

8 Cut-Off Wall Quality Assurance Inspection and Testing 3

9 HDPE Pipe and Fittings 6

10 Non-Woven Geotextile (NOT USED) 1

11 Woven Geotextile 4

12 Soils 3

13 Aggregates (NOT USED) 1

14 Grassing (NOT USED) 1

15 Daily and Final Cleanup 1

16 Site Limitations 1

17 General Provisions 3

18 Construction Schedule 1

19 Final Inspection and Acceptance 1

20 Scheduling and Coordination 2

Orlando Utilities Commission Section 2 Stanton Energy Center Page 1 of 2 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________

SPECIFICATIONS

SECTION 2 INTENT

COMBUSTION WASTE STORAGE AREA RUNOFF POND


ORLANDO UTILITIES COMMISSION STANTON ENERGY CENTER ORANGE COUNTY, FLORIDA

The work consists of furnishing all labor, materials, plant, equipment, tools, supervisory personnel, and Contractor's facilities needed to install a soil-bentonite cut-off wall to the lines, grades and dimensions shown on the Drawings. The work includes all or parts of the following:


Utility Demolition/Removal, including: demolition/removal and plugging/capping of existing 6” diameter perforated underdrain pipes, 24” and 36” diameter RCP outlet and inlet pipes and associated inlet headwall.

Cut-Off Wall Installation, including: installation of approximately 158,000 square feet of soil-bentonite cut-off wall and an overlying soil cap along an 2,500-foot long alignment to the lines, grades and dimensions shown on the Drawings. The cut-off wall will extend vertically from final grade elevation of 87 feet (NAVD), and will be keyed not less than 3 feet into the underlying bedclay formation, with total wall depths ranging from about 60 to 75 feet. The cut-off wall will have a minimum thickness of 2.5 feet, an in situ soil-bentonite backfill hydraulic conductivity equal to or less than 1.0x10-7 cm/sec, and a minimum dry bentonite addition of 4.0 percent by dry weight of soil. The cut-off wall shall be installed by the slurry trench method of construction using slurry with a density the greater of the specified minimum density or the minimum density required to maintain a stable trench.

Inlets and Outlets Pipe Installation, including: installing two 36-inch diameter HDPE inlet

pipes for stormwater runoff, two 24-inch diameter HDPE inlet pipes from decant cells, and two 24-inch diameter outlet pipes.

The work will be performed in near proximity to the existing Combustion Waste Storage Area (CWSA) landfill, CWSA runoff pond and environmentally sensitive areas located to the north, south and east of the project site. The Contractor shall properly maintain the work area as needed through the use of silt fence and soil berms to prevent runoff or the release of any bentonite slurry, trench backfill materials or eroded soils into the recharge ditch or adjoining undisturbed areas.

Orlando Utilities Commission Section 2 Stanton Energy Center Page 2 of 2 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ The cut-off wall will be installed through fill and natural ground soil materials. Considerable variation in the composition and consistency of the existing fill materials and natural ground soils may be encountered throughout the depth of the cut-off wall excavation. Available subsurface data and the results of test borings performed along the cut-off wall alignment are contained in the Drawings and Bid Documents. The Contractor shall carefully examine the Drawings and Information to Bidders and fully satisfy himself of the nature and variability of the subsurface soils and excavation depths along the length of the cut-off wall alignment. It is understood and agreed by the Contractor that groundwater at the site has been impacted by past landfill operations. Groundwater pH is in the range of 3.7 to 3.9 and total dissolved solids concentrations are in the range of 1,300 to 2,300 mg/l. Available groundwater quality data are presented in the Information to Bidders. Ancillary work shall include but is not limited to: (i) surveying; (ii) demolition and incidental removal of debris or foreign objects from within the limits of construction; (iii) construction and maintenance of access roads;(iv) repair to any OUC facilities, utilities, equipment or property damaged by the Contractor; (v) hauling and spraying water to control dusting; (vi) dewatering and control of surface water runoff; (vii) excavating and backfilling dewatering ditches; (viii) construction and maintenance of staging areas; (ix) earthwork required to excavate slurry mixing ponds; (x) earthwork required to backfill and abandon slurry mixing ponds following completion of the work; (xi) maintenance of working pads and construction of containment berms, as needed to prevent runoff or the release of bentonite slurry, trench backfill materials or eroded soils from the work pad; (xii) disposal of all unsuitable soil excavated from the slurry trench and remaining unused bentonite slurry; (xiii) earthwork required to restore ground surfaces disturbed as a result of construction activities; (xiv) maintenance of completed work until accepted by the Owner; and (xv) final site clean-up. The Contractor shall coordinate work activities with the Owner and Subcontractors involved in the project to maintain the required construction schedule.


SPECIFICATIONS

SECTION 3 LIST OF DRAWINGS




The drawings listed below are for bidding purposes. Materials shall not be ordered or work started before receiving drawings marked “Issued for Construction”. The drawings may be revised later to change the location or arrangement of the work, provide additional details, or include additional information or changes in some features of the work. Such revisions shall not be deemed cause for a price change unless it can be shown that the Contractor’s work has changed materially.

Drawing No. Revision Title

G-1 P1 Cover Sheet

G-2 P1 Index of Drawings and Project Location Map

G-3 P1 General Notes, Abbreviations and Symbols

G-4 P1 Aerial Photograph of Stanton Energy Center

G-5 P1 Topographic Map of Site

G-6 P1 Aerial Photograph of Proposed CWSA Runoff Pond And Decant Cell

G-7 P1 General Site Plan

G-8 P1 Erosion Control Plan

G-9 P1 Overall Site Plan

CW-1 P1 Cut-Off Wall Alignment Plan

CW-2 P1 Cut-Off Wall Construction Pad

CW-3 P1 Cross Sections

CW-4 P1 Soil Boring Location Plan

CW-5 P1 Soil Boring Profiles CW-01 To CW-16

CW-6 P1 Soil Profile Along Western Cut-Off Wall Alignment

CW-7 P1 Soil Profile Along Southern Cut-Off Wall Alignment

CW-8 P1 Soil Profile Along Eastern Cut-Off Wall Alignment

CW-9 P1 Soil Profile Along Northern Cut-Off Wall Alignment

CW-10 P1 Cut-Off Wall Details


SPECIFICATIONS

SECTION 4 CONTRACTOR’S UNDERSTANDING




This Specification contains the following sections.

Section

Item Page

4.1

Conditions and Nature of Work 1

4.2

Safety 1

4.3

Surveying and Layout of the Work 2

4.4

Site Access 2

4.5

Protection of Existing Facilities 2

4.1 Conditions and Nature of Work It is understood and agreed that the Contractor has, by careful examination and inspection, fully satisfied himself/herself as to the nature and location of the work, conformation and character of the site conditions, construction materials, site accessibility and site limitations, surface and subsurface water flow conditions, subsurface geologic conditions, proximity of existing structures and utilities, kind of equipment and facilities needed for the performance of this work, and general and local conditions which can affect the work covered hereunder. It is understood and agreed by the Contractor that groundwater at the site has been impacted by past plant operations. Groundwater pH is in the range of 3.7 to 3.9 and total dissolved solids concentrations are in the range of 1,300 to 2,300 mg/l. Available groundwater quality data are presented in the Information to Bidders. 4.2 Safety The Contractor shall strictly comply with all applicable safety regulations and standards including all federal, state, and local laws, ordinances, rules and regulations, and site specific safety regulations of the Owner. The Contractor shall also comply with all OSHA trench safety requirements and with the Trench Safety Act (Senate Bill 2626). The Contractor shall refer to the OUC Project Manager and Safety Officers for additional details regarding site-specific safety training requirements. The

Orlando Utilities Commission Section 4 Stanton Energy Center Page 2 of 2 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ OUC’s Contractors Safety Management Policy will be provided by the Owner. The Contractor shall submit Job Safety Analyses (JSA) associated with all construction activities. 4.3 Surveying and Layout of the Work The Owner will establish reference points for horizontal and vertical controls near and/or within the construction site at the beginning of construction. From these reference points, the Contractor shall provide all horizontal and vertical controls necessary to complete the work to the lines, grades, slopes and dimensions shown on the Drawings. The Contractor’s survey shall be in compliance with the vertical and horizontal tolerances in the specifications, and shall be conducted under the direct supervision of a Florida Registered Land Surveyor. Markings and grade stakes shall be provided as needed by the Contractor to facilitate and expedite inspection of the finished grades for compliance with the dimensions on the Drawings and specified grade tolerances. It is the responsibility of the Contractor to verify all dimensions prior to fabrication, installation and/or construction of any item of work. 4.4 Site Access The Contractor shall, by his own inspection and by careful examination, fully convince himself as to the accessibility of the site for performing the work. The Contractor shall be responsible for maintaining access roads and work areas during the duration of construction. Any modifications outside the construction limits shall be submitted by the Contractor to the Owner for approval at least one week prior to making any modifications. All areas disturbed by the Contractor during construction of temporary access roads and staging areas shall be re-graded and restored to the pre-existing conditions, or as otherwise approved by the Owner. 4.5 Protection of Existing Facilities As directed by the Owner, the Contractor shall be responsible, at no additional cost, for timely repair or replacement of structures, equipment, utilities, piezometers, and any facilities and/or other on-going or completed construction item damaged by the Contractor's and/or his Subcontractor’s operations and/or personnel.

Orlando Utilities Commission Section 5 Stanton Energy Center Page 1 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ SPECIFICATIONS

SECTION 5 GENERAL REQUIREMENTS AND PROVISIONS




This Specification contains the following sections.

Section Item Page

5.1 Access, Inspection and Testing 1

5.2 Engineering Data, Geologic Soil Profile and Test Boring Logs 2

5.3 Drawings and Specifications 2

5.4 Right to Change Location and Drawings 3

5.5 As-Built Drawings 3 5.6 Disposal of Waste Soil and Rock 3

5.7 Daily & Final Clean-Up 3

5.8 Water Supply 4

5.9 Contractor’s Facilities and Utilities 4

5.10 Construction Schedule 4

5.11 Scheduling and Coordination 4

5.12 Method of Measurement for Payment 5

5.13 Final Inspection and Acceptance 6

5.14 Safety 6

5.1 Access, Inspection and Testing All materials furnished by the Contractor shall be subject to the examination and approval of the Owner, or his/her representative, at any and all times during the progress of the work and until final completion. As soon as the materials are examined and tested, the Contractor shall immediately remove all rejected materials from the work area to a location such distance therefrom as the Owner may require. No material shall be used before being examined and approved by the Owner or his/her representative, but the failure on the part of the Owner or his/her representative to condemn or reject inferior materials or work shall not be construed to imply an acceptance of the same should their inferiority become evident at any time prior to final acceptance of the work.

Orlando Utilities Commission Section 5 Stanton Energy Center Page 2 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ The Contractor shall make necessary arrangements so that the Engineer may secure samples of materials on the job for testing to ascertain whether any material to be included in the work meets the requirements of these specifications. The Owner and his/her representative shall have free access to the work areas at all times. The Contractor shall furnish them with personnel and equipment, as needed, for ascertaining whether the work being performed, or the work which has been completed, is in accordance with the requirements of these specifications, even to the extent of uncovering, testing, or removing portions of finished work, if such is necessary. The Owner may order the Contractor to suspend any work that may be affected, damaged or endangered by climatic conditions. Further, the Owner may temporarily suspend any work at any time when acceptable results, as defined by these specifications, cannot be obtained due to inclement weather or other unsatisfactory field conditions. 5.2 Engineering Data, Geologic Soil Profile and Test Boring Logs A total of 16 test borings were performed by Tetra Tech - Ardaman & Associates, Inc. along or in close proximity to the cut-off wall and drain alignments. The geotechnical information and boring logs are included on the design Drawings and in the Information to Bidders. Generalized soil profiles were prepared along the cut-off wall alignment based on an interpretation of the borings and are included in the Drawings. The generalized geologic profile is provided for informational purposes only, and should be reviewed in conjunction with the boring logs and the accompanying notes and disclaimers on the Drawings. While the borings are representative of subsurface conditions at their respective locations and over their respective vertical reaches, local variations characteristic of the subsurface materials of the region, are anticipated and may be encountered. The boring logs and related information are based on the driller's logs and visual examination of selected samples in the laboratory. The delineation between soil types shown on the logs is approximate, and the description represents an interpretation of subsurface conditions at the designated boring location on the particular date drilled. The results of laboratory tests performed on soil samples recovered from the borings are presented on the generalized geologic soil profile included in the Drawings and the individual boring logs included in the Information to Bidders. The soil samples have been classified in general accordance with ASTM Standard D2487 "Classification of Soils for Engineering Purposes". The transitions between soil types are expected to be more gradual than implied on the boring logs and as shown on the geologic profile. Groundwater levels shown on the geologic profile and boring logs represent groundwater surfaces encountered during drilling, and seasonal fluctuations in the groundwater table and potentiometric water levels should be anticipated throughout the year. An absence of water surface data at certain boring locations implies that groundwater data is not available, but does not mean that groundwater will not be encountered at these locations or within the vertical reaches of these borings. 5.3 Drawings and Specifications The Drawings and Specifications are intended to be coordinated. Anything shown on the Drawings but not mentioned in the specifications, or vice-versa, or anything not expressly set forth in either, but which is reasonably implied, shall be furnished as though specifically shown and mentioned in

Orlando Utilities Commission Section 5 Stanton Energy Center Page 3 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ both without any extra charge. Should anything be omitted from the Drawings, which is the subject of this Contract, it shall be the duty of the Contractor to so notify the Owner before signing the Contract. The Contractor shall furnish detailed plans and drawings if required for execution of the work and which are not included in the plans and drawings furnished by the Owner. The Contractor shall submit all drawings and schedules with his bid and again sufficiently in advance of construction to allow ample time for checking, correcting, resubmitting, and rechecking. No claim by the Contractor for delays, arising from his failure in this respect, shall be allowed. All drawings submitted by the Contractor must bear the stamp of approval by the Contractor as evidence that the drawings have been checked by the Contractor. The approval by the Owner or Engineer of drawings submitted by the Contractor shall be only for conformance with the design of the project and shall not relieve the Contractor of the responsibility for adherence to the Contract, nor shall it relieve him of the responsibility for any error which may exist. 5.4 Right to Change Location and Drawings When additional information regarding the subsurface soil or groundwater conditions, or other conditions become available as a result of excavation, testing or other exploratory work, the Owner may find it desirable to change the alignments, dimensions or design of a portion of the work to conform to the newly disclosed conditions. Toward this end, the Owner reserves the right to make such reasonable changes, and the Contractor's operations shall be conducted so as to accommodate reasonable changes without additional expense. 5.5 As-Built Drawings The Contractor shall maintain one set of prints on the job site at all times for the preparation of the As-Built Drawings. This set shall be in addition to any sets needed and used in the actual construction operation. The As-Built Drawings are to be kept up to date by the Contractor, as approved by the Owner, on a daily basis. The plans shall show the as-built condition of the cut-off wall and the drain. 5.6 Disposal of Waste Soil and Rock Soil and rock excavated from the slurry trench that is not suitable for use in the soil-bentonite backfill (i.e., organic materials, rock fragments larger than 2 inches in diameter), and waste soil (i.e., soil containing bentonite) remaining at the end of construction not suitable for use in site grading shall be disposed of by the Contractor in designated on-site areas and in a manner approved by the Owner. Excess bentonite slurry displaced from the trench shall be thoroughly mixed with granular soil prior to disposal in designated areas. 5.7 Daily & Final Clean-Up The Contractor shall clean-up the work site and install all barricades as needed at the end of each work day to maintain the site in a clean and safe condition as required by OUC safety regulations.

Orlando Utilities Commission Section 5 Stanton Energy Center Page 4 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ Upon completion of the work, the Contractor shall remove and dispose of all trash, debris, bentonite slurry, unused soil, etc., resulting from operations and excavations during construction of the cut-off wall. Remaining unused soil and bentonite slurry will be removed and disposed of by the Contractor in areas designated by the Owner. Soil surfaces disturbed by the cut-off wall installation shall be cleaned of bentonite slurry and/or soil-bentonite backfill and re-filled and/or re-graded to the elevations shown on the Drawings or as otherwise approved by the Owner. All slurry ponds shall be pumped dry and backfilled by the Contractor. All trash and debris shall be removed from the premises by the Contractor following installation of the cut-off wall. 5.8 Water Supply The Owner will make available to the Contractor access to a water source for use during construction of the cut-off wall. The Contractor shall be responsible for securing water from the designated source and transporting it to the construction area. The Contractor shall, by his own inspection and careful examination, fully convince himself as to availability and quality of water to be used. It is the Contractor’s responsibility to notify the Owner if an insufficient amount of water is available or if the source of water is not suitable for its intended use. 5.9 Contractor's Facilities and Utilities The Owner will make available a site near the construction area for use by the Contractor as a lay-down area and for the Contractor's construction trailer. The Owner will not provide utilities to the Contractors facilities. 5.10 Construction Schedule The Contractor shall work all necessary hours required to meet the project completion schedule and ensure that all areas are properly maintained at all times during the work. The Contractor shall submit with his bid, and again just prior to the beginning of construction, the anticipated rate of production per day and a construction schedule in the form of a bar chart showing all construction activities. Weekly updating of the construction schedule will be required as the work progresses. 5.11 Scheduling and Coordination All scheduling and coordination of the work outlined herein shall be undertaken through the OUC representative assigned to the work. There will be at least one pre-construction meeting to be attended by the Contractor, the Engineer, and the Owner after the bid is awarded and before construction is started. The Contractor shall designate a project manager at the pre-construction meeting. The Contractor’s designated site supervisor shall also attend this meeting. Progress meetings shall be conducted weekly at a time determined at the pre-construction meeting. The following items shall be discussed in the progress meeting: (i) safety issues; (ii) activities and accomplishments of the previous week; (iii) overall progress of the project in relation to the project schedule; (iv) activities and goals for the week; and (v) any construction problems/deficiencies.

Orlando Utilities Commission Section 5 Stanton Energy Center Page 5 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ Special meetings shall be conducted when problems or deficiencies occur or are likely to occur. These meetings shall be attended by the parties involved which may include the Owner, the Engineer and the Contractor. In these meetings, the problems or deficiencies shall be defined, discussed and resolved. All questions and correspondence regarding the Drawings and Specifications shall be directed to the Engineer, Tetra Tech - Ardaman & Associates, Inc., at the following address: Ardaman & Associates, Inc. Post Office Box 593003 Orlando, Florida 32859-3003 Package Delivery: 8008 South Orange Avenue Orlando, Florida 32809 Attention: Mr. Mohamad Al-hawaree, P.E. Telephone: 407-855-3860 Cell: 407-467-8282 Facsimile: 407-859-8121 E-mail: [email protected] All other questions and correspondence shall be directed to the Owner at the following address: Orlando Utility Commission

Stanton Energy Center 5100 Alafaya Trail Orlando, FL 32831-2005 Attention: Mr. Charlie Doud, P.E. Telephone: 407-434-4289 (office); 407-719-6055 (cell)

E-mail: [email protected] 5.12 Method of Measurement for Payment Payment for mobilization will be made for the entire lump sum amount shown in the Bid Form upon completing the mobilization required to perform the work. Similarly, payment for demobilization will be made for the entire lump sum amount shown on the Bid Form upon final demobilization from the site. No measurement for payment for earthwork will be made. Payment for earthwork; site preparation; clearing, stripping and grubbing of vegetation; silt fence installation; trench excavation for utility clearance; dewatering and surface water control; utility demolition/removal, plugging and capping; grassing by seeding; and ancillary earthwork items will be made at the applicable lump sum price bid in the Bid Form

Orlando Utilities Commission Section 5 Stanton Energy Center Page 6 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ Measurement for payment for construction of the cut-off wall shall be based on the completed excavation depth and length, excluding the lead-in trench. Payment will be made for backfilled and completed portions of the cut-off wall at the corresponding unit price per square foot (depth x length) bid in the Bid Form. Payment for over-excavation will not be made unless specifically requested and approved, in writing, by the Owner or the Engineer. No measurement for payment for work pad construction and installation of the soil cap will be made. Payment for these items and ancillary cut-off wall work items will be made at the applicable lump sum price bid in the Bid Form. No measurement for payments for installation of HDPE inlets and outlets pipes will be made. Payment for pipe installation will be made at the applicable lump sum prices shown on the Bid Form If the actual quantity of any item varies from the estimated quantity because of unknown conditions or other reasons, the Contractor shall be entitled to no additional allowance above the prices bid in the Bid Form. The actual quantities for payments will be agreed upon by the Owner and the Contractor. Under no circumstances or conditions will the Contractor be paid anything on account of anticipated profits on work which is not actually performed. Partial payments for bid items may be requested monthly by the Contractor for the estimated portion of each item completed and tentatively accepted by the Owner. Final payment will be made after all work has been successfully completed, inspected and accepted. 5.13 Final Inspection and Acceptance Upon completing all clean-up operations, the Contractor shall advise the Owner and the Engineer that he is ready for final inspection. The Owner will then set a specific date and time for final inspection. The Owner, Engineer and Contractor will jointly inspect the project area to verify that all work has been completed in accordance with the Drawings and Specifications. Any work found lacking in any way shall be corrected and re-inspected. At that time, the Owner will issue a Letter of Acceptance to the Contractor, and the Contractor can then request final payment. 5.14 Safety The Contractor, Contractor employees, Subcontractor(s), and Subcontractor employees shall comply with all applicable safety regulations and standards including all Federal, State and Local laws, ordinances, rules, and regulations. The Contractor, Contractor employees, Subcontractor(s), and Subcontractor employees shall also comply with OSHA trench safety requirements and with the Trench Safety Act (Senate Bill 2626). The Contractor shall refer to the OUC Safety Document, available from the Owner, for additional details regarding site-specific training requirements. The OUC’s Contractors Safety Management Policy will be provided by the Owner. The Contractor shall submit Job Safety Analyses (JSA) associated with all construction activities.

Orlando Utilities Commission Section 6 Stanton Energy Center Page 1 of 4 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ SPECIFICATIONS

SECTION 6 GENERAL EARTHWORK




6.1 Description of Work This Specification covers earthwork associated with preparation of the cut-off wall working pad; construction of berms, containment dikes and grades along the cut-off wall alignment as needed to prevent runoff or the release of any bentonite slurry, trench backfill or eroded soils into adjacent areas; earthwork required to backfill and properly abandon slurry mixing ponds following completion of the work and/or grading and shaping ground surfaces disturbed by the Contractor; excavation and backfilling dewatering ditches, the preparation of working surfaces as needed, and final grading to the lines, grades and dimensions shown on the Drawings.

Section Item Page

6.2 Referenced Standards 1

6.3 Layout of Work 2

6.4 Source of Fill 2

6.5 Material Requirements 2

6.6 Dewatering, Surface Water Control and Maintenance of Construction Areas

3

6.7 Placement and Compaction Requirements 3

6.8 Final Site Grading 3

6.9 Grading Tolerances 4

6.10 Dust Control 4

6.11 Quality Control Inspection and Testing 4

6.12 Submittals 4

6.2 Referenced Standards The following ASTM International (ASTM) standards are referenced in this Specification.

D698: Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3))

D1140: Standard Test Method for Amount of Material in Soils Finer than the No. 200 Sieve

Orlando Utilities Commission Section 6 Stanton Energy Center Page 2 of 4 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________

D1556: Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone Method

D2216: Test Method for Laboratory Determination of Water (Moisture) Content of Soil and

Rock

D2487: Standard Classification of Soils for Engineering Purposes (Unified Soil Classification System)

D2937: Standard Test Method for Density of Soil in Place by the Drive Cylinder Method

D2974: Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and

Other Organic Soils

D4944: Standard Test Method for Field Determination of Water (Moisture) Content of Soil by the Calcium Carbide Gas Pressure Tester Method

6.3 Layout of Work The Owner will establish reference points for horizontal and vertical control near the construction areas. The cut-off wall alignment has been located on the Drawings based on the State Plane coordinate system. It is the responsibility of the Contractor to verify all locations and dimensions prior to performance of the work. Any field adjustments in the cut-off wall layout by the Contractor shall be approved by the Owner and Engineer prior to construction. 6.4 Source of Fill Soil fill required for the work shall be obtained from on-site areas designated by the Owner. 6.5 Material Requirements 6.5.1 General Soil Fill General soil fill used for site grading, construction of the cut-off wall working pad shall consist of sand, slightly silty sand, silty sand, or slightly clayey sand classifying as SP, SP-SM, SM, or SP-SC type soils in accordance with ASTM Standard D2487. These soils shall also be free from rocks, stones, gravel and cemented fragments greater than 1/4-inch in size, and shall be free from deleterious materials (organic material, wood, trash, debris, sharp objects, and any hard objects/particles greater than 1/4-inch in size, etc.). The fines content of SM-type soils shall be less than 20 percent as determined in accordance with ASTM Standard D1140. The organic content shall be equal to or less than 2 percent determined in accordance with ASTM Standard D2974. 6.5.1 Pipe Bedding Soil materials used for pipe bedding shall be non-cemented and free from rocks, stones, gravel and other deleterious materials (organic material, wood, trash, debris, sharp objects, particles greater than 1/4-inch in size, etc.), and shall consist of sand or slightly silty sand classifying as SP or SP-SM type soils in accordance with ASTM Standard D2487. The organic content shall be equal to or less than 1 percent determined in accordance with ASTM Standard D2974.

Orlando Utilities Commission Section 6 Stanton Energy Center Page 3 of 4 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ 6.6 Dewatering, Surface Water Control and Maintenance of Construction Areas The Contractor shall maintain the condition of the work pad and adjacent work areas as needed to prevent runoff or the release of any bentonite slurry, trench backfill materials or eroded soils into the adjacent ditch and undisturbed areas. The Contactor shall also be responsible for controlling run-on water into the slurry trench excavation through the use of ditches and/or diversion berms. Small diversion berms may be constructed by mounding soil adjacent to the slurry wall trench to prevent water from entering the trench. Any dewatering ditches used for construction shall be backfilled in accordance with Section 6.7.2 of this Specification. The method of dewatering will be the responsibility of the Contractor, subject to approval by the Owner. The Contractor's proposed methods for dewatering and routing shall be submitted to the Owner for approval prior to implementation. 6.7 Placement and Compaction Requirements 6.7.1 Site Grading and Work Pad Soil fill used for site grading and work pad construction shall be placed in level lifts not exceeding 12 inches in loose thickness and compacted at a moisture content within +/-3 percent of the Standard Proctor optimum moisture content to an in-place dry density equal to or greater than 95 percent of the Standard Proctor maximum dry density determined in accordance with ASTM Standard D698. The soil shall be moisture conditioned as needed to achieve the required in-place dry density. 6.7.2 Pipe Bedding Pipe bedding soil shall be placed in level lifts not exceeding 6 inches in loose thickness, to at least the extent shown on the Drawings, and compacted at a moisture content within +/-3 percent of the Standard Proctor optimum moisture content to an in-place dry density equal to or greater than 95 percent of the Standard Proctor maximum dry density determined in accordance with ASTM Standard D698. The soil shall be moisture conditioned as needed to achieve the required in-place dry density. Compaction shall be by vibrating plate, mechanical tamper, or other equipment approved by the Engineer. The remaining trench shall be backfilled with soil fill placed in level lifts not exceeding 12 inches in loose thickness. All trench backfill shall be compacted at a moisture content within +/-3 percent of the Standard Proctor optimum moisture content to an in-place dry density of not less than 95 percent of the Standard Proctor maximum dry density (ASTM Standard D698). The filling and compaction shall continue in lifts until the pipe trench is completely backfilled to the lines and grades shown on the Drawings. 6.8 Final Site Grading Upon completion of installation of the soil-bentonite cut-off wall and drain, the Contractor shall be responsible for placement and compaction of fill for final grading in the work pad area. All surfaces disturbed by construction activities shall be graded by the Contractor, and the surfaces shall be compacted to a depth of 12 inches to an in-place dry density of not less than 95 percent of the

Orlando Utilities Commission Section 6 Stanton Energy Center Page 4 of 4 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ Standard Proctor maximum dry density (ASTM Standard D698). All fill materials shall be placed in relatively uniform lifts, not exceeding 12 inches in compacted thickness. During placement, the fill shall be wetted or dried, as necessary, and homogenized to achieve a uniform consistency. 6.9 Grading Tolerances All work shall be performed to within a vertical tolerance of +/-0.2 feet from the grades and dimensions shown on the Drawings. All construction shall be completed to within a horizontal tolerance of +/-0.3 feet. 6.10 Dust Control The Contractor shall maintain the surfaces of soil in the work area sufficiently moist at all times to minimize the development of windblown dust. 6.11 Quality Control Inspection and Testing The Engineer will undertake observations and perform quality control tests to determine compliance of the materials and work with these Specifications. Quality control by the Engineer will include monitoring: (i) the suitability and homogeneity of fill used in construction; (ii) placement, lift thickness, moisture conditioning, and compaction of fill; and (iii) site dewatering and surface water control. The Engineer will perform moisture content determinations (ASTM D2216) and in situ density determinations on the soil backfill and soil bedding by the drive cylinder method (ASTM D2937), sand cone method (ASTM D1556), or other method approved by the Engineer, to determine compliance with this Specification. In situ density tests will be performed at the frequencies designated in Section 12.5 of the Specifications, or as otherwise directed by the Engineer. Standard Proctor compaction tests (ASTM Standard D698) will be performed by the Engineer at least once for every 500 cubic yards of fill to determine compliance with the requirements of this Specification. Moisture contents obtained using calcium carbide gas pressure meters (ASTM D4944) calibrated for soil may be used by the Engineer to provide guidance for construction control, but final acceptance will be based upon the ASTM Standard D2216 test method unless approved otherwise by the Engineer. Penetration test probes will also be used as needed, at the Engineer’s discretion, to verify the uniformity of compaction. 6.12 Submittals The Contractor shall submit his proposed methods for dewatering to the Owner for approval at least two weeks prior to construction.

Orlando Utilities Commission Section 7 Stanton Energy Center Page 1 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ SPECIFICATIONS

SECTION 7 CUT-OFF WALL CONSTRUCTION




The Specification includes the following sections.

Section Item Page

7.1 Description of Work 1

7.2 Layout of Work 1

7.3 Cut-Off Wall Geometric Requirements 2

7.4 Cut-Off Wall Material Requirements 2

7.5 Cut-Off Wall Construction 4

7.6 Soil Cap above Cut-Off Wall 6

7.1 Description of Work The work covered by these specifications shall consist of furnishing all tools, labor, materials, plant, equipment, supervisory personnel and Contractor's facilities required to construct: (i) approximately 158,000 square feet of soil-bentonite backfill cut-off wall as indicated on the Drawings and/or in these specifications; and (ii) ancillary work as indicated on the Drawings and/or in these specifications. The cut-off wall shall have a minimum thickness of 2.5 feet and an in situ hydraulic conductivity equal to or less than 1.0x10-7 cm/sec. Although the bentonite content required to achieve the above specified hydraulic conductivity may vary along the length of the wall, a minimum dry bentonite addition of 4.0 percent by dry weight of soil shall be maintained in all portions of the cut-off wall. 7.2 Layout of Work The Owner will establish reference points for horizontal and vertical control near the construction area. From these reference points, the Contractor shall provide all horizontal and vertical controls necessary to complete the work to the locations, lines and grades shown on the Drawings, or as otherwise directed by the Engineer. The cut-off wall alignment has been located based on the State Plane coordinate system. It is the responsibility of the Contractor to verify all locations and dimensions prior to performance of any work. Any field adjustments in the cut-off wall alignment proposed by the Contractor shall be approved by the Owner and Engineer prior to construction.

Orlando Utilities Commission Section 7 Stanton Energy Center Page 2 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ 7.3 Cut-Off Wall Geometric Requirements 7.3.1 Width of Cut-Off Wall The soil-bentonite backfill cut-off wall shall have a minimum width of 2.5 feet throughout. 7.3.2 Top of Cut-Off Wall The top of the soil-bentonite backfill shall be constructed to the grades shown on the Drawings. The soil cap at the top of the soil-bentonite backfill shall be installed to ensure that the base of the cap is located 2.5 feet below final grade. 7.3.3 Depth of Cut-Off Wall The cut-off wall must extend a minimum of 3 feet into the relatively impervious bedclay layer or other suitable key-in material approved by the Engineer. The estimated depths of the cut-off wall are shown on the Drawings. Actual cut-off wall depths are expected to vary (i.e., they may be different than that indicated on the Drawings) and they will be determined by the Engineer during trench excavation. The elevation of the base of the cut-off wall trench will be determined by the Engineer to confirm that the depth of penetration is in compliance with the above criteria. Materials excavated from the base of the trench will be examined by the Engineer to confirm penetration into the bedclay or other suitable key-in material. The depth of the cut-off wall may be modified by the Engineer if deemed necessary. Adjustments to the Contract due to changes in the cut-off wall depth from that shown on the Drawings shall be determined using the unit prices bid on the Bid Form. It is the responsibility of the Contractor to inform the Engineer when the backhoe first encounters the bedclay at each depth measurement location along the trench alignment, and to assist the Engineer in making depth measurements to determine the depth of the actual top of the bedclay and the bottom of the trench at each measurement location. 7.4 Cut-Off Wall Material Requirements 7.4.1 Bentonite The bentonite material used in the slurry for trench excavation and in the soil-bentonite backfill for the cut-off wall shall consist of a premium grade, high-swelling, natural sodium montmorillonite satisfying the minimum requirements of API standard 13A - Section 4. The Contractor shall provide certificates from the manufacturer on each shipment of bentonite certifying the bentonite properties. The bentonite shall provide satisfactory performance when mixed with water obtained from the site, and when subjected to the quality of groundwater at the site without loss of its filtrate control properties, and without affecting the ability of the bentonite slurry to entrain sand in suspension as needed to maintain the minimum required slurry density. The Contractor shall submit a 10 pound sample and manufacturer’s product data sheet for the bentonite(s) proposed for use prior to construction, and shall indicate the source and properties of the proposed bentonite for approval by the Engineer. Approval of the bentonite by the Engineer shall not in any way relieve the Contractor of his responsibility to select and use a bentonite capable of achieving and maintaining the density

Orlando Utilities Commission Section 7 Stanton Energy Center Page 3 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ and viscosity requirements of the slurry called for in these specifications, as needed to maintain a stable trench. The Contractor shall not change the bentonite during the work without the prior approval of the Engineer. 7.4.2 Water The Owner will make available to the Contractor access to a water source during construction of the cut-off wall. The Contractor shall be responsible for securing water from the designated source and transporting it to the construction area. The Contractor shall, by his own inspection and careful examination, fully convince himself as to the availability and quality of water to be used. It is the Contractor’s responsibility to notify the Owner if an insufficient amount of water is available or if the source of water is not suitable for its intended use. 7.4.3 Additives Additives shall not be used in the bentonite slurry or soil-bentonite backfill unless approved by the Engineer. 7.4.4 Bentonite Slurry The bentonite slurry used for supporting the sides of the trench and for mixing with backfill material shall consist of a stable colloidal suspension of bentonite in clean water. The bentonite slurry viscosity, prior to mixing with the backfill, shall be no less than 40 Marsh seconds as determined by a Marsh Funnel in accordance with API RP 13B-1 "Standard Procedure for Field Testing Water-Based Drilling Fluids" (Section 4). Prior to introduction into the trench or mixing with the soil backfill, the bentonite slurry shall have a density of not less than 64 lb/ft3 as determined by API RP 13B-1 (Section 3). The Contractor shall, by adding and mixing soil to the bentonite slurry in the trench, maintain the bentonite slurry density in the trench as high as needed to provide a stable trench. The density of the slurry in the trench shall be maintained above a minimum of 82 lb/ft3. The density of the slurry in the trench may be modified by the Engineer if deemed necessary to maintain a stable trench. The bentonite slurry everywhere in the trench must also be maintained fluid enough to pass through a Marsh Funnel, and its density must be at least 15 lb/ft3 lighter than that of the soil-bentonite backfill mixture. 7.4.5 Soil Used in Backfill Mixture Soil used as backfill in the soil-bentonite backfill mixture shall consist of soil excavated from the slurry trench provided it is composed of no deleterious materials (i.e., trash, wood, organic material, etc.), has no particles larger than 2 inches in diameter, is thoroughly homogenized prior to mixing with bentonite slurry, and is approved for use as backfill by the Engineer. The soil backfill shall have no less than 15 percent material by dry weight passing the U.S. Standard No. 200 sieve (ASTM Standard D422). Rock and cemented sand fragments larger than 2 inches in diameter shall not be used as soil backfill. Offsite borrow soils, if proposed for use by the Contractor, shall be approved by the Engineer. Locations of areas to stockpile borrow soils at the construction site, if needed, shall be approved by the Owner.

Orlando Utilities Commission Section 7 Stanton Energy Center Page 4 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ 7.4.6 Soil-Bentonite Backfill Mixture Sufficient bentonite slurry and dry bentonite shall be added and mixed uniformly and homogeneously with the soil backfill such that the soil-bentonite backfill mixture has the following properties: (i) a minimum dry bentonite addition of 4.0 percent by dry weight of soil shall be maintained in

all portions of the cut-off wall with the added provision that the bentonite content shall be increased, if needed, to achieve the specified hydraulic conductivity (where the bentonite content is defined as the ratio of the dry weight of bentonite to the dry weight of soil);

(ii) a minimum of 15 percent material (bentonite and soil) by dry weight finer than the U.S.

Standard No. 200 sieve determined in accordance with ASTM Standard and D 422; (iii) a hydraulic conductivity equal to or less than 1.0x10-7 cm/sec at the in situ density; (iv) a saturated paste placement consistency and water content corresponding to a slump cone

value between 4 and 6 inches as determined in accordance with ASTM Standard C143; (v) a placement saturated unit weight at least 15 lb/ft3 greater than the bentonite slurry in the

trench determined in accordance with API RP 13B-1. For determining compliance with the hydraulic conductivity requirements, the following criteria shall be used: a soil-bentonite backfill mixture hydraulic conductivity up to 2.0x10-7 cm/sec will be allowed provided no more than 20 percent of the tested samples for each 500-foot long section of cut-off wall display a hydraulic conductivity greater than 1.0x10-7 cm/sec, and provided the average hydraulic conductivity of the soil-bentonite backfill mixture is equal to or less than 1.0x10-7 cm/sec. The Contractor shall proceed with backfill placement with the understanding that if the backfill in the trench fails to meet specifications, he is responsible for removing and replacing the soil-bentonite backfill at no additional cost to the Owner. The soil-bentonite backfill mixture must not shrink, consolidate or otherwise settle more than 2 inches beneath the upper surface of the working pad during the first 24 hours after filling, and no more than 8 inches prior to placement of the soil cap. If settlement in excess of these specifications occurs, the Contractor shall be required to refill the trench with approved soil-bentonite backfill mixture at his own expense. 7.5 Cut-Off Wall Construction 7.5.1 Excavation of Slurry Trench The slurry trench shall be excavated by the slurry method (i.e., under bentonite slurry). The toe of the slope of the trench excavation shall precede the toe of slope of the soil-bentonite backfill mixture by a minimum of 50 feet and a maximum of 150 feet to permit proper cleaning of the trench bottom, inspection of the material at the base of the trench, and measurement of the depth of the trench. 7.5.2 Maintenance of Slurry Trench Excavation

Orlando Utilities Commission Section 7 Stanton Energy Center Page 5 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ The Contractor shall maintain the stability of the excavated trench at all times. The elevation of the surface of the bentonite slurry and the density of the bentonite slurry shall be maintained as high as required to prevent cave-in, with the elevation of the surface of the bentonite slurry maintained within one foot of the top of the excavated trench, and at least 2 feet above the surrounding water table or piezometric water pressure in confined soil layers at all times during construction. The excavated trench above the bentonite slurry level shall not be allowed to cave into the bentonite slurry-filled trench. The Contractor shall provide all personnel, equipment and material, as needed, to maintain the bentonite slurry density and elevation as required at all times during trench construction including after hours, weekends and holidays. 7.5.3 Cleaning of Excavation Bottom After excavation of the trench is complete, the bottom of the excavation shall be cleaned of sediments, as required, prior to the placement of soil-bentonite backfill mixture to meet the requirements for the recommended backfill hydraulic conductivity and the requirements for a uniform, homogeneous backfill. 7.5.4 Disposal of Unsuitable Materials Soil and rock excavated from the slurry trench and which are unsuitable for use as soil backfill shall be disposed of in on-site areas designated by the Owner. 7.5.5 Mixing of Soil-Bentonite Backfill The soil-bentonite backfill shall be mixed adjacent to the slurry trench on the working pad. The soil backfill, bentonite slurry, and dry bentonite addition shall be thoroughly mixed into a uniform soil-bentonite backfill mixture prior to placement in the trench. The Contractor shall propose his method for adding the dry bentonite to the soil backfill to meet the minimum specified bentonite content for approval by the Engineer. 7.5.6 Soil-Bentonite Backfill Mixture Placement Care shall be exercised during backfilling to ensure that the soil-bentonite backfill mixture flows and displaces the bentonite slurry in the trench, and to ensure that a uniform and homogeneous soil-bentonite backfill cut-off wall is constructed. Initially, the backfill mixture shall be placed in the slurry trench by pushing the backfill into the slurry trench from one location along a lead-in trench excavated with a slope no steeper than 1.0 horizontal to 1.0 vertical (1H:1V) at the beginning of the excavation until the material forms its angle of repose and emerges above the bentonite slurry surface. The Contractor shall then backfill from the location of the initial backfill to the opposite end of the trench. Backfilling operations shall proceed in such a manner that the slope of the soil-bentonite backfill is maintained no steeper than 5H:1V nor flatter than 10H:1V. The soil-bentonite backfill material shall be placed such that it slides down the slope of the previously placed backfill, and in such a manner that pockets of bentonite slurry are not trapped within the backfill. Free dropping of backfill through the bentonite slurry shall not be permitted. The soil-bentonite backfill may be placed through the use of a bulldozer or other equipment approved by the Engineer, and in such a manner that the backfill below the bentonite slurry surface will be pushed along the trench.

Orlando Utilities Commission Section 7 Stanton Energy Center Page 6 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ While pushing the soil-bentonite backfill mixture into the slurry trench, care shall be exercised not to push any unsuitable materials (including fill materials from the working pad) along with the backfill into the trench, or to cause a cave-in at the top of the trench. The depth to the slope of the soil-bentonite backfill shall be measured by the Contractor in the presence of the Engineer, along the entire length of the backfill slope at no more than 20-foot intervals at the end of each day’s work and again the next work day prior to placement of any soil-bentonite backfill. If decreases in the depth to the backfill are detected, it shall be the responsibility of the Contractor to confirm to the Engineer (e.g., via additional depth soundings or sampling) that the decrease in the depth to the surface of the soil-bentonite backfill is not a result of a cave-in of the trench wall or surface sloughing. 7.5.7 Shrinkage/Consolidation of Backfill Surface The soil-bentonite backfill mixture must not shrink, consolidate or otherwise settle more than 8 inches beneath the top surface of the working pad prior to placement of the soil cap. The Contractor shall schedule the work to allow the soil-bentonite backfill to settle and consolidate as much as possible prior to construction of the soil cap. Prior to placement of the soil-cap, the surface of the backfill shall have stabilized at a settlement/shrinkage rate no greater than 0.25 inches per day. When required, as determined by the Engineer, the Contractor shall refill the trench with approved soil-bentonite backfill mixture. Immediately prior to construction of the soil cap above the soil-bentonite cut-off wall, the top of the soil-bentonite backfill shall be excavated to the elevations shown on the Drawings. The exposed soil-bentonite backfill surface shall be inspection and be free of desiccation cracks. 7.5.8 Joints Joints between non-continuous horizontally constructed cut-off wall segments, if warranted by the Contractor and approved by the Owner and the Engineer, shall be constructed such that the segments of cut-off wall overlap a minimum of 30 feet (i.e., no less than 30 feet of the already in-place cut-off wall shall be excavated and re-backfilled prior to resuming the cut-off wall construction). Joints between non-continuous vertically constructed cut-off wall segments, if warranted, shall be constructed such that the segments overlap a minimum of 3 feet. 7.5.9 Containment of Bentonite Slurry During construction of the slurry trench, the Contractor shall construct earth berms on both sides of the work area as needed to prevent the release of bentonite slurry, soil-bentonite backfill or rainfall runoff contaminated with bentonite slurry/soil-bentonite backfill into any drainage ditches, water bodies, or off-site areas. 7.6 Soil Cap above Cut-Off Wall A soil cap shall be constructed atop the soil-bentonite cut-off wall to the lines, grades and dimensions shown on the Drawings. The soil used for construction of the soil cap shall consist of fill free of deleterious materials (i.e., wood, trash, debris, topsoil, roots, organic material, etc.) obtained

Orlando Utilities Commission Section 7 Stanton Energy Center Page 7 of 7 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ______________________________________________________________________________ from the site. The fill material denoted as semi-compacted general backfill on the Drawings shall consist of slightly clayey to clayey sands free of deleterious materials and classifying as SP-SC or SC type soils in accordance with ASTM Standard D2487. The fill material denoted as compacted general backfill on the Drawings shall consist of slightly silty, silty, slightly clayey or clayey sands free of deleterious materials and classifying as SP-SM, SM, SP-SC, or SC type soils in accordance with ASTM Standard D2487. All fill materials shall be approved by the Engineer prior to their use in construction. Prior to placing the soil cap, a woven polypropylene geotextile either Geotex 315ST, Thrace- LINQ GTF-300, Mirafi 600X or an equivalent geotextile approved by the Engineer, shall be placed in accordance with the Drawings. The soil cap shall be placed in loose level lifts not exceeding 12 inches in thickness and shall be compacted at a molding moisture content on the wet side of the Standard Proctor optimum moisture content (ASTM Standard D698). The lower 12 inches of the cap, denoted as semi-compacted general backfill on the Drawings, shall be compacted as needed to break all clumps, fill all voids, prevent bulking, and produce a homogeneous relatively firm base material. The upper 18 inches of the cap, denoted as compacted general backfill on the Drawings, shall be compacted to a dry density equal to or greater than 95 percent of the Standard Proctor maximum dry density (ASTM Standard D698).


SPECIFICATIONS

SECTION 8 CUT-OFF WALL QUALITY ASSURANCE INSPECTION AND TESTING




The Specification contains the following sections.

Section Item Page

8.1 Cut-Off Wall Construction 1

8.2 Soil Cap 3

8.1 Cut-Off Wall Construction The Engineer shall undertake observations and perform quality control testing to confirm compliance of the soil-bentonite backfill cut-off wall construction with these specifications. The Contractor shall also perform his own quality control tests specifically referred to in these specifications. Quality control testing performed by the Engineer will include: (i) monitoring the depth of penetration of the cut-off wall; (ii) monitoring the bentonite slurry viscosity, and density in the slurry trench and from the mixing plant; (iii) determining the slump and unit weight of the soil-bentonite backfill; (iv) performing laboratory hydraulic conductivity tests to confirm compliance with the soil-bentonite backfill hydraulic conductivity criteria; and (v) performing particle-size analyses to confirm compliance with the soil-bentonite backfill gradation requirements. 8.1.1 Uniformity and Depth The Engineer will continuously monitor construction to confirm that the cut-off wall is uniformly and homogeneously constructed of approved soil-bentonite backfill, that the depth of penetration of the cut-off wall is in compliance with the Drawings, and that the depth of the wall extends a minimum of 3 feet into the bedclay layer or other suitable key-in layer approved by the Engineer. Material from the trench bottom will be examined to document the nature of the material encountered at the base of the trench. The depth to the top of the bedclay or key-in layer and total depth of the slurry trench shall be measured by the Contractor, in the presence of the Engineer, at a minimum of once every 10-feet of slurry trench. 8.1.2 Bentonite Slurry Viscosity and Density in Slurry Trench The Contractor, in the presence of the Engineer, shall measure the bentonite slurry viscosity and density in the slurry trench excavation to verify that the minimum slurry density required for trench stability and slurry fluidity required to allow displacement by the soil-bentonite backfill are

Orlando Utilities Commission Section 8 Stanton Energy Center Page 2 of 3 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ maintained in accordance with Section 7.4.4 of these specifications. The bentonite slurry viscosity and density in the slurry trench shall be determined at a minimum of once every 2 hours during working hours while any portion of a slurry trench is open. These measurements shall be made on slurry samples obtained from the trench at a minimum of three depths selected by the Engineer at each sampling location for each 300 lineal feet of open trench. The bentonite trench slurry viscosity and density shall be measured and recorded by the Contractor at least once per day on non-work days (i.e., holidays and weekends), and copies of the records shall be provided to the Owner and Engineer at the beginning of the next working day. The bentonite slurry viscosity shall be determined with a Marsh Funnel and the bentonite slurry density with a mud balance in accordance with API RP 13B-1. 8.1.3 Bentonite Slurry Viscosity and Density from Mixing Plant The Contractor, in the presence of the Engineer, shall measure the viscosity and density of the bentonite slurry introduced into the slurry trench from the mixing plant to verify that the minimum slurry density (i.e., 64 lb/ft3) and viscosity (i.e., 40 seconds-Marsh) are maintained in accordance with Section 7.4.4 of these specifications. The bentonite slurry density and viscosity introduced into the slurry trench shall be determined each time the mixing plant begins operation and at a minimum of once every 2 hours while slurry is being introduced into the trench. The bentonite slurry viscosity shall be determined with a Marsh Funnel and the bentonite slurry density with a mud balance in accordance with API RP 13B-1. 8.1.4 Bentonite Slurry Level The Contractor, in the presence of the Engineer, shall measure the bentonite slurry level in the trench relative to the top of the working surface each time the bentonite slurry viscosity and density are determined. 8.1.5 Soil-Bentonite Backfill Slump and Density The slump and density of the soil-bentonite backfill shall be determined by the Contractor, in the presence of the Engineer, after mixing with the bentonite slurry at the initiation of each day's backfill placement, and a minimum of once every 2 hours during placement of the soil-bentonite backfill. The backfill slump shall be determined in accordance with procedures given in ASTM C143 "Slump of Portland Cement Concrete", and the density shall be determined with a mud balance in accordance with API RP 13B-1. 8.1.6 Soil-Bentonite Backfill Particle-Size Distribution Particle-Size distribution analyses will be performed by the Engineer on the soil-bentonite backfill. A minimum of one sample of backfill per day or one sample for each 100 lineal feet of installed cut-off wall shall be obtained for particle-size testing in accordance with ASTM Standard D422. 8.1.7 Soil-Bentonite Backfill Hydraulic Conductivity Laboratory hydraulic conductivity tests will be performed by the Engineer on the soil-bentonite backfill. A minimum of one sample per day or one sample for each 100 lineal feet of installed cut-off wall shall be obtained for laboratory hydraulic conductivity testing. The tests shall be constant

Orlando Utilities Commission Section 8 Stanton Energy Center Page 3 of 3 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ head type hydraulic conductivity tests performed under backpressure on specimens molded to the in situ dry density at the placement moisture content. During testing, the specimens shall be exposed to average effective isotropic consolidation stresses not greater than 3 lb/in2 and hydraulic gradients less than 12. The average hydraulic conductivity of the soil-bentonite backfill mixture shall be equal to or less than 1.0x10-7 cm/sec. The average hydraulic conductivity shall be determined based on the results from a minimum of five hydraulic conductivity tests for each 500-foot section of cut-off wall. For determining compliance with the hydraulic conductivity specifications, a soil-bentonite backfill mixture hydraulic conductivity up to 2.0x10-7 cm/sec will be allowed provided no more than 20 percent of the tested samples for each 500-foot long section of cut-off wall display a hydraulic conductivity greater than 1.0x10-7 cm/sec. 8.2 Soil Cap The Engineer will undertake observations and perform quality control testing to confirm compliance of earthwork for the soil cap with these specifications. Quality control testing will include monitoring the placement and compaction of the soil cap above the cut-off wall. The Engineer will also undertake in situ density tests to confirm compliance with compaction requirements. 8.2.1 Fill Characteristics The Engineer will monitor fill placement to confirm that approved fill materials are used in the soil cap. Particle-size distribution tests (ASTM Standard D422 or D1140) and Standard Proctor compaction tests (ASTM Standard D698) will be performed on soils used to construct the soil cap. Particle-size distribution tests shall be performed on at least one sample of the semi-compacted and compacted soil layers per 200 feet of cut-off wall. 8.2.2 Fill Placement and Compaction The Engineer will monitor the fill placement procedures, the thickness of individual lifts, the wetting and drying of the fill materials as needed to achieve the specified degree of compaction, and the proper homogenizing of the fill materials prior to compaction. 8.2.3 In Situ Density Tests The Engineer will perform in situ density tests after compaction of a lift and compare the results with the Standard Proctor compaction test results for the given soil before allowing the placement of additional fill. Testing will be performed by drive cylinder method (ASTM Standard D2937), or other ASTM method approved by the Engineer. Penetration test probes may also be used as needed to verify the uniformity of compaction. In situ density tests will be performed in the soil cap above the cut-off wall at a minimum frequency of one test per 100 feet of cut-off wall in the compacted soil layer.


SPECIFICATIONS

SECTION 9 HDPE PIPE AND FITTINGS




9.1 Description of Work This Specification covers the material requirements and installation of HDPE pipe and fittings shown on the Drawings. HDPE pipes and fittings will be supplied by the Owner for installation by the Contractor. This Specification contains the following sections.

Section Item Page



9.4 Joint Requirements 4

9.5 Storage and Handling 5

9.6 Installation 5

9.7 Protection and Repairs 5


9.9 Submittals 6


D638: Standard Test Method for Tensile Properties of Plastics

D695: Standard Test Method for Compressive Properties of Rigid Plastics

D696: Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics

D790: Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

D792: Standard Test Method for Density and Specific Gravity (Relative Density) of Plastics

by Displacement


D1238: Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer

D1505: Standard Test Method for Density of Plastics by the Density-Gradient Technique

D1603: Standard Test Method for Carbon Black in Olefin Plastics

D1693: Standard Test Method for Environmental Stress Cracking of Ethylene Plastics

D2240: Standard Test Method for Rubber Property - Durometer Hardness

D2412: Standard Test Method for External Loading Properties of Plastic Pipe by Parallel-Plate Loading

D2513: Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing and Fittings D2657: Standard Practice for Heat Fusion Joining of Polyolefin Pipe and Fittings

D2837: Standard Specification for Obtaining Hydrostatic Design Basis for Thermoplastic

Pipe Materials

D3261: Standard Specification for Butt Heat Fusion Polyethylene Plastic Pipe and Tubing

D3350: Standard Specification for Polyethylene Plastics Pipe and Fittings Materials

F714: Standard Specification for Polyethylene Plastic Pipe Based on Outside Diameter 9.3 Material Requirements 9.3.1 Base Resin The base resin shall be high density, high molecular weight polyethylene (HDPE) with properties equivalent to ASTM D3350 cell classification PE345444C or PE345464C. The pipe and fittings shall be manufactured from virgin resin with no regrind material. The resin shall contain not less than 97 percent of the base resin, and not less than 2.0 percent carbon black. The pipe material shall contain no more than 3 percent carbon black, antioxidants and heat stabilizers combined, and no other additives, fillers or extenders. 9.3.2 Physical Appearance All pipes and fittings shall have good appearance qualities. The pipe and fittings shall be homogeneous throughout, and the surfaces shall be smooth and uniform with no visible defects. The pipes shall be free of holes, cracks, nicks, cuts, gouges, scratches, blisters, gels, undispersed ingredients, any signs of contamination by foreign inclusions, or any defect that may affect serviceability. 9.3.3 Perforations Where slotted pipe is specified on the Drawings, the slots shall be cleanly cut, identical in geometry, and evenly spaced. The slot length shall be located perpendicular to the longitudinal axis of the

Orlando Utilities Commission Section 9 Stanton Energy Center Page 3 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ pipe. Slots shall be located in two straight rows along the length of the pipe. The rows of slots shall be spaced 180° on centers around the circumference of the pipe, and shall not be staggered. The slots shall satisfy the following criteria:

Slot Width (inches) >0.09 and <0.12 Slot Length Measured Along Outer Circumference (inches) >1.50 and <2.50 Slotted Area (in2/foot of pipe) >2.0 (outer wall)

>1.0 (inner wall) Spacing Between Slots Along Pipe Length (c/c, inches) >1.0 and <3.0

A complete description of the proposed HDPE base resin, pipe perforations and fittings that meet the requirements of the Specifications, in addition to a 3-foot long sample of the slotted pipe, shall be submitted by the Supplier to the Owner for approval prior to drain installation. 9.3.4 Physical Properties Pipe and fitting dimensions, workmanship, standard dimension ratio (SDR) and corresponding pressure rating shall be in accordance with the requirements of ASTM F714. Pipes shall be furnished in Standard 40-foot lengths. The pipe material shall meet the following criteria:

Property Test Method Criterion

Density Melt Index Carbon Black Content Flexural Modulus Tensile Strength at Yield Elongation at Yield Modulus of Elasticity Environmental Stress Crack Resistance Hardness Compressive Strength at Yield Hydrostatic Design Basis Low Temperature Brittleness Thermal Expansion Coefficient

ASTM D1505 ASTM D1238 ASTM D1603 ASTM D790 ASTM D638, Type IV* ASTM D638, Type IV* ASTM D638, Type IV* ASTM D1693, Condition C ASTM D2240 ASTM D695 ASTM D2837 ASTM D746 ASTM D696

>0.945 g/cc <0.15 g/10 minutes ≥2.0% & <3.0% >125,000 psi >3,000 psi >8% >100,000 psi >5,000 hrs >60 Shore "D" >1,600 psi >1,600 psi <-118ºC <0.022%/ºC

*Type IV Specimen tested at a rate of strain of 2 inches/minute

The Contractor or Supplier shall submit a complete description of the HDPE pipe and fittings proposed for use to the Engineer for approval at least two weeks prior to pipe installation. The Manufacturer's product data sheets and certification from the Manufacturer that the pipe and fittings are in compliance with this Specification shall also be supplied to the Engineer at least two weeks prior to installation. 9.3.5 Fabricated Fittings Fabricated fittings made by butt fusing cut segments of pipe shall be used where shown on the Drawings. Fabricated fittings shall be made using pipe segments meeting the base resin, physical appearance and physical property requirements specified in Sections 9.3.1, 9.3.2 and 9.3.4 of this Specification. Shop drawings for fabricated fittings shall be submitted to the Engineer for approval at least two weeks prior to fabrication.

Orlando Utilities Commission Section 9 Stanton Energy Center Page 4 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ 9.3.6 Approved Manufacturers The following manufacturers and corresponding pipe series designations are approved for use:

Chevron Phillips DriscoPlex PE 3408 Pipe Series Poly Pipe EHMW PE 3408 Pipe Series

Other manufacturers producing equivalent pipes may be approved provided product data sheets and resin certificates are submitted to the Engineer to confirm compliance with this Specification. The Manufacturer’s product data sheets, resin certificates, and certification from the Manufacturer that the pipe and fittings are in compliance with these Specifications shall be submitted to the Engineer for approval at least two weeks prior to installation. 9.3.7 Marking and Packaging The pipe Manufacturer shall mark each pipe length and each fitting with the Manufacturer’s name or trademark, pipe series designation, size and SDR. Packaging, handling and shipment shall be in accordance with the pipe Manufacturer’s standards, instructions and recommendations. 9.3.8 Molded Fittings Molded fittings shall meet the requirements of Sections 9.3.1, 9.3.2 and 9.3.3 of this Specification, and the requirements of ASTM D2513 and D3261. 9.4 Joint Requirements The HDPE pipe, and the pipe and fittings, shall be joined using butt, heat fusion welds. All joints shall be made in compliance with the Manufacturer's recommended practice for heater surface temperature, heating time, applied pressure and cooling time, subject to the Engineer's approval. All field joints shall be made by HD Supply trained technicians qualified by the Manufacturer and using equipment and procedures approved by the Manufacturer. All drain pipe joints shall be stronger than the pipe itself under both tension and hydrostatic loading conditions. The joints shall be leak-tight, homogeneous and uniform throughout. The Contractor shall submit written documentation certifying compliance with the Manufacturer’s standard specifications and Quality Assurance/Quality Control plan for the butt, heat fusion technique. Bent strap tests shall be performed at least once per day for each pipe diameter and SDR to demonstrate the integrity of the fusion welds. Bolted flange connections at manholes, where specified on the Drawings, shall be made in accordance with the Manufacturer’s recommendations and the details shown on the Drawings. The flange outside diameter and drilling configuration shall conform to ANSI standards. The bolts, nuts and washers shall be AISI type 316 stainless steel. The HDPE flanges shall have AISI type 316 stainless steel back-up rings. Bolts shall be torqued in accordance with the Manufacturer’s recommendations, and as approved by the Engineer. The torque of each bolt shall be checked

Orlando Utilities Commission Section 9 Stanton Energy Center Page 5 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ when the bolts are cool. Flanged connections will not be allowed to be buried unless the bolts are cool and the torque of each bolt checked just prior to burial. 9.5 Storage and Handling The Contractor shall comply with the pipe Manufacturer's recommendations for handling and storing pipe and fittings. The pipe shall be stored on clean, level ground to prevent undue scratching or gouging and as needed to protect the pipe from being covered with excessive dirt, from water and moisture, and from mechanical abrasion. Care shall be taken to minimize the amount of soil collected inside the pipe while handling and installing. The handling of the pipe shall be in such a manner such that the pipe is not damaged by dragging it over sharp objects, and care shall be exercised during installation not to damage the pipes and fittings. 9.6 Installation The installation of the pipes and fittings shall be made by the Contractor coordinating his work with the Owner’s pipe supplier for delivery of materials and field welding. The installation methods and handling shall be in accordance with the Manufacturer’s recommendations as approved by the Engineer. Pipe sections shall be joined adjacent to the trench, prior to placing the pipe in the drain. Care shall be taken not to drop the pipe while moving it, and to avoid excess stress or strain during installation. When pulling the pipe, either a pulling head or a suitable wraparound sleeve with rubber protective cover shall be used to prevent the pulling cables from damaging the pipe. The maximum pulling length shall be limited to 500 feet. Pipe installation and placement of backfill around pipes shall be performed when the pipe is in a contracted state, i.e., during the cool of the morning, at night, or during periods of over-cast skies. Immediately after placement, the pipe shall be thoroughly and completely embedded, supported, and covered, and the backfill compacted, in accordance with Sections 6.6 and 6.8 of these Specifications. 9.7 Protection and Repairs Care shall be exercised during construction not to damage the pipes and fittings. Construction equipment shall not be allowed to pass over any placed pipe until a minimum of 2 feet of compacted cover is placed above the crown of the pipe. Any pipe section, fitting or joint which becomes broken, cracked, crushed, cut, scratched, gouged or otherwise rendered unsuitable, as determined by the Engineer, shall be removed and replaced by the Contractor. Scratches greater than 6 inches in length and gouges exhibiting a depth in excess of 8 percent of the wall thickness of the pipe or fitting shall be cause for rejection of a pipe section or fitting to the extent designated by the Engineer. 9.8 Quality Control Inspection and Testing The Engineer, representing the Owner, will undertake observations and inspections to determine compliance of the materials and work with this Specification. Quality control by the Engineer will

Orlando Utilities Commission Section 9 Stanton Energy Center Page 6 of 6 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 _____________________________________________________________________________ include monitoring and/or inspecting: (i) the HDPE pipe and fittings for correct size, SDR rating, workmanship, and fabrication; (ii) slot dimensions, spacing, orientation and workmanship for the slotted HDPE pipe; (iii) installation, alignment and fusion welding of pipe and fittings; and (iv) damage to any pipe segment during installation. The Contractor shall obtain and secure samples of slotted pipe and fusion welds for conformance testing by the Engineer. The Contractor shall obtain the samples from locations designated by the Engineer. All samples shall be properly marked and identified by the Contractor. Laboratory quality control tests will be performed by the Engineer on slotted pipe and fusion weld samples at the following minimum frequencies:

Property Test Method Minimum Testing Frequency

Slot Dimensions and Slotted Area

Caliper Measurements Once per Every 200 lineal feet of Slotted Pipe

Fusion Weld Integrity Bent Strap Test (ASTM D2657)

Once per Day per Pipe Diameter and SDR

Failure of any sample to meet the requirements specified herein shall be considered cause for rejection of the material or installed section from which the sample was collected to the extent designated by the Engineer. If the Contractor can establish to the Engineer, via additional tests, that the failed sample is representative of a smaller section of the installed material than the entire lot represented by the original test sample, then only that portion will be rejected. The additional tests, however, shall be performed by the Engineer, representing the Owner. The Contractor shall reimburse the Owner for any such test that fails to meet the requirements specified herein. 9.9 Submittals The following submittals are required from the Contractor as part of the requirements of Section 9 of the Specifications.

A complete description of the HDPE pipe and fittings with the Manufacturer’s product data sheets, description of the HDPE resin, Manufacturer’s certificate of analysis for the HDPE resin, and Manufacturer’s certification that the pipe and fittings satisfy the requirements of this Specification.

A complete description of the slot dimensions, spacing and orientation, and a 3-foot long section of slotted pipe.


SPECIFICATIONS

SECTION 10 NON-WOVEN GEOTEXTILE




NOT USED

Orlando Utilities Commission Section 11 Stanton Energy Center Page 1 of 4 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________

SPECIFICATIONS

SECTION 11 WOVEN GEOTEXTILE




11.1 Description of Work This Specification covers the material and installation requirements for woven geotextile within the cut-off wall soil cap. The Specification contains the following sections.

Section Item Page



11.4 Factory Testing 3

11.5 Handling and Installation 3


11.7 Submittals 4

11.2 Referenced Standards The following ASTM International (ASTM) standards are referenced in the Specification.

D413: Standard Test Methods for Rubber Property-Adhesion to Flexible Substrate.

D1238: Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer

D1248: Standard Specification for Polyethylene Plastics Molding and Extrusion Materials

D1505: Standard Test Method for Density of Plastics by the Density-Gradient Technique

D1603: Standard Test Method for Carbon Black in Olefin Plastics

D1683: Standard Test Method for Failure of Sewn Seams in Woven Fabrics

D3776: Standard Test Methods for Weight (Mass) per Unit Area of Woven Fabrics D3786: Standard Test Method for Hydraulic Bursting Strength of Knitted Goods and

Nonwoven Fabrics-Diaphragm Bursting Strength Tester Method


D4491: Standard Test Methods for Water Permeability of Geotextiles by Permittivity

D4533: Standard Test Method for Trapezoid Tearing Strength of Geotextiles

D4632: Standard Test Method for Grab Breaking Load and Elongation of Geotextiles

D4716: Standard Test Method for Constant Head Hydraulic Transmissivity (In-Plane Flow) of Geotextiles and Geotextile Related Products

D4751: Standard Test Method for Determining Apparent Opening Size of a Geotextile

D4833: Standard Test Method for Index Puncture Resistance of Geotextiles,

Geomembranes, and Related Products D5035: Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip

Method) D5199: Standard Test Method for Measuring Nominal Thickness of Geotextiles and

Geomembranes 11.3 Material Requirements The woven geotextile shall consist of 100 percent polypropylene, and shall exhibit the following minimum properties:

Property Test Method Criterion

Grab Tensile Strength ASTM D4632 ≥ 300 lb

Grab Elongation ASTM D4632 ≥ 15%

Trapezoidal Tear Strength ASTM D4533 ≥ 115 lb

Puncture Resistance ASTM D4833 ≥ 120 lb

Mullen Burst Strength ASTM D3786 ≥ 600 lb/in2

Apparent Opening Size ASTM D4751 U.S. No. 40

The woven geotextile product shall be woven polypropylene consisting of either Propex 2006, Thrace-LINQ GTF 300, Marafi 600X, or an equivalent geotextile approved by the Engineer. A complete description of the geotextile proposed for use and the Manufacturer’s product data sheets shall be submitted to the Engineer for approval at least two weeks prior to installation. Certification from the Manufacturers that the geotextiles are in compliance with this Specification shall also be supplied to the Engineer two weeks prior to installation. The geotextile shall be uniform and homogeneous in appearance and composition and shall be free of tears, cuts or any defect that, in the Engineer's opinion, may affect serviceability. Each geotextile roll shall be individually packaged at the factory to prevent damage during shipping and handling, and shall be completely wrapped by a protective ultraviolet resistant thin plastic film having a minimum thickness of 2 mils

Orlando Utilities Commission Section 11 Stanton Energy Center Page 3 of 4 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ 11.4 Factory Testing Factory testing for physical properties of the woven geotextile shall be performed on production line samples at a frequency of at least one sample for each 1,000 yd2 of geotextile. As a minimum, the Contractor shall submit the Manufacturer's test results for all of the material criteria in Section 11.3 to the Engineer for approval at least 2 weeks prior to installation of the geotextile. Failure of any of the tests shall result in rejection of the corresponding batch of geotextile material. 11.5 Handling and Installation The woven geotextile shall be in good contact with the underlying ground surface. Geotextile rolls shall not be placed during periods of precipitation, high winds or other adverse climatological conditions. The Contractor shall provide temporary ballast loading (e.g., sand bags) as needed to hold the geotextile in place during installation. After installation, no portion of the geotextile shall be left exposed for more than 48 hours (i.e., the overlying soil materials shall be placed within 48 hours of geotextile installation). The ends of the geotextile placed along the cap alignment may be either joined with sewn seams or overlapped by not less than 3 feet. Sewn seams shall be made using a minimum overlap of 4 inches. Sewn seams shall be made with a sewing machine using a flat sewn seam with one row of stitches with a minimum of 4 stitches per inch, or a seam and stitching pattern recommended by the Manufacturer and approved by the Engineer. The thread used to sew the seams shall be 2000 denier minimum, or as recommended by the Manufacturer and approved by the Engineer, and shall have the same composition as the geotextile. The strength of field seams shall not be less than 50 percent of that of the unaged geotextile in any principal direction when tested in accordance with ASTM D4884 at a strain rate of 12 inches/minute. If field sewn seams are used, the Contractor shall submit details of the proposed sewing method (type of stitch, number of stitches per inch, number of stitching rows, distance from the edge of the geotextile to the stitches, weight and type of thread, etc.) and a minimum 3 foot long sample of the sewn seam for approval by the Engineer at least two weeks prior to installation. All tears, punctures, thinly stretched sections, or any other defect that may, as determined by the Engineer, render the geotextile unsuitable, shall be repaired by the Contractor. Repairs shall be made by placing and sewing a patch of geotextile over the damaged area with a 12-inch minimum overlap all around. 11.6 Quality Control Inspection and Testing The Engineer will undertake observations and perform quality control tests to determine compliance of the materials and work with this Specification. Quality control by the Engineer will include monitoring and/or inspecting geotextile handling, installation and overlapping. Laboratory quality control tests will be performed by the Engineer at the following frequencies to determine compliance with these Specifications.


Property Test Method Minimum Testing

Frequency

Grab Strength & Elongation ASTM D4632 Once per every 10 rolls

Failure of any sample to meet or exceed the requirements specified herein shall be considered cause for rejection of the material or installed section from which the sample was collected to the extent designated by the Engineer. If the Contractor can establish to the Engineer, via additional tests performed by the Engineer, that the failed sample is representative of a smaller section of the installed material than the entire lot represented by the original test sample, then only that portion will be rejected, provided, however, that the additional tests are performed by the Engineer representing the Owner. The Contractor shall also reimburse the Owner for any such test that fails to meet the requirements specified herein. 11.7 Submittals The following submittals are required from the Contractor as part of the requirements of this Specification.

● A complete description of proposed woven geotextile, the Manufacturer’s product data sheets, and the Manufacturer’s certification that the geotextile meets the requirements of this Specification.


SPECIFICATIONS

SECTION 12 SOILS




12.1 Description of Work This Specification covers material, placement and compaction requirements for soil used for general fill and pipe bedding. The Specification includes the following sections.

Section Item Page

12.1 Description of Work 1



12.4 Placement and Compaction Requirements 2



D422: Standard Test Method for Particle-Size Analysis of Soils

D698: Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3))

D1140: Standard Test Method for Amount of Material in Soils Finer than the No. 200 Sieve

D1556: Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-

Cone Method

D2216: Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock

D2487: Standard Classification of Soils for Engineering Purposes (Unified Soil

Classification System)

D2937: Standard Test Method for Density of Soil in Place by the Drive Cylinder Method


D2974: Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils

D4944: Standard Test Method for Field Determination of Water (Moisture) Content of Soil

by the Calcium Carbide Gas Pressure Tester Method 12.3 Material Requirements 12.3.1 General Soil Fill General soil fill used for site grading, construction of the cut-off wall working pad, and as drain trench backfill shall consist of sand, slightly silty sand, silty sand, or slightly clayey sand classifying as SP, SP-SM, SM, or SP-SC type soils in accordance with ASTM Standard D2487. These soils shall also be free from rocks, stones, gravel and cemented fragments greater than 1/4-inch in size, and shall be free from deleterious materials (organic material, wood, trash, debris, sharp objects, and any hard objects/particles greater than 1/4-inch in size, etc.). The fines content of SM-type soils shall be less than 20 percent as determined in accordance with ASTM Standard D1140. The organic content shall be equal to or less than 2 percent determined in accordance with ASTM Standard D2974. 12.3.2 Pipe Bedding Soil materials used for pipe bedding shall be non-cemented and free from rocks, stones, gravel and other deleterious materials (organic material, wood, trash, debris, sharp objects, particles greater than 1/4-inch in size, etc.), and shall consist of sand or slightly silty sand classifying as SP or SP-SM type soils in accordance with ASTM Standard D2487. The organic content shall be equal to or less than 1 percent determined in accordance with ASTM Standard D2974. 12.4 Placement and Compaction Requirements 12.4.1 Site Grading and Work Pad Soil fill used for site grading and work pad construction shall be placed in level lifts not exceeding 12 inches in loose thickness and compacted at a moisture content within +/-3 percent of the Standard Proctor optimum moisture content to an in-place dry density equal to or greater than 95 percent of the Standard Proctor maximum dry density determined in accordance with ASTM Standard D698. The fill shall be wetted or dried, as necessary, and homogenized to achieve a uniform moisture content throughout each lift, and subsequently compacted to achieve the required in-place dry density. 12.4.2 Pipe Bedding Pipe bedding soil shall be placed in level lifts not exceeding 6 inches in loose thickness, to at least the extent shown on the Drawings, and compacted at a moisture content within +/-3 percent of the Standard Proctor optimum moisture content to an in-place dry density equal to or greater than 95 percent of the Standard Proctor maximum dry density determined in accordance with ASTM Standard D698. The soil shall be moisture conditioned as needed to achieve the required in-place dry density.

Orlando Utilities Commission Section 12 Stanton Energy Center Page 3 of 3 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ Compaction shall be by vibrating plate, mechanical tamper, or other equipment approved by the Engineer. The remaining trench shall be backfilled with soil fill placed in level lifts not exceeding 12 inches in loose thickness. All trench backfill shall be compacted at a moisture content within +/-3 percent of the Standard Proctor optimum moisture content to an in-place dry density of not less than 95 percent of the Standard Proctor maximum dry density (ASTM Standard D698). The filling and compaction shall continue in lifts until the pipe trench is completely backfilled to the lines and grades shown on the Drawings. 12.5 Quality Control Inspection and Testing The Engineer will undertake observations and perform quality control tests to determine compliance of soil materials with this Specification. Quality control by the Engineer will include monitoring: (i) the suitability of the borrow soils used in construction; and (ii) placement and compaction. The Engineer will perform moisture content determinations (ASTM D2216) and in situ density tests on the compacted soils. Density tests will be performed using the drive cylinder method (ASTM D2937) or sand cone method (ASTM D1556). Moisture content tests made in the field using calcium carbide gas pressure moisture meters (ASTM D4944) may be used to provide moisture content information only for construction control. The Engineer will perform Standard Proctor compaction tests (ASTM D698) and organic content tests (ASTM D2974) on representative samples as needed for compaction control and to determine material compliance with then specifications. The Engineer will perform the following quality control tests on soil materials at the indicated minimum testing frequencies.

Material Property Test Method Minimum

Testing Frequency

General Soil Fill for Site

Grading and Work Pad

In-Place Density ASTM D2937 ASTM D1556

Once per every 200 yd3

Fines Content ASTM D1140 Once per every 200 yd3

General Soil Fill Trench

Backfill


Once per every 200 lineal feet of trench

Fines Content ASTM D1140 Once per every 200 lineal feet

of trench

Pipe Bedding


Once per every 200 lineal feet of trench

Fines Content ASTM D1140 Once per every 200 lineal feet

of trench

Orlando Utilities Commission Section 13 Stanton Energy Center Page 1 of 1 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ SPECIFICATIONS

SECTION 13 AGGREGATES




NOT USED


SECTION 14 GRASSING




NOT USED


SECTION 15 DAILY AND FINAL CLEANUP




15.1 House Keeping and Refuse Disposal The Contractor shall clean-up the work site and install barricades as needed at the end of each work day to maintain the site in a clean and safe condition. The Contractor shall dispose of all trash, debris, waste, and excess materials resulting from all construction operations. Uncontaminated trash, waste and debris shall be removed from the OUC Facility premises by the Contractor, and disposed of properly in accordance with applicable State and Local requirements. 15.2 Contaminated Materials and Equipment Contaminated groundwater water shall not be removed from the site. Contaminated construction materials shall be disposed of by the Contractor in an on-site area designated by the Owner. Contaminated construction equipment (i.e., dozer tracks, tire treads, truck beds, etc.) shall be cleaned prior to removing the equipment from the premises. 15.3 Unused Materials Unused materials may be stockpiled and left on site, if approved by the Owner, in areas designated by the Owner. If not approved by Owner, the Contractor shall remove all unused materials from the site. 15.4 Restoration of Disturbed Areas Areas disturbed by construction shall be cleaned and/or graded as directed by the Owner to restore the conditions that existed prior to construction.


SECTION 16 SITE LIMITATIONS




16.1 Owner’s Activities and Other Construction Maintenance and operational activities performed by the Owner may occur on and around the project site throughout the period of construction. All activities of the Contractor must be approved by and coordinated with the Owner to avoid conflicts with the Owner’s activities and the activities of other Contractors at the site. 16.2 Existing Facilities Any damage to existing facilities by the Contractor shall be repaired by the Contractor at his expense as directed by the Owner.

Orlando Utilities Commission Section 17 Stanton Energy Center Page 1 of 3 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ SPECIFICATIONS SECTION 17 GENERAL PROVISIONS




The General Provisions include the following sections.

Section Title Page

17.1 General 1

17.2 Drawings and Specifications 2

17.3 Engineering Data 3

17.4 Right to Change Location and Drawings 3

17.5 As-Built Drawings 3

17.1 General 17.1.1 Scheduling and Coordination The Contractor shall keep the Owner informed, a reasonable time in advance, of the times and places at which he intends to do work. All work shall be scheduled and coordinated with the Owner as outlined in Section 18 and Section 20.4 of the Specifications. 17.1.2 Monthly Submittal of Worked Man Hours The Contractor shall keep records of the man hours worked during each month. A report summarizing all work hours must be submitted to the OUC Project Manager by the 5th work day of the month. 17.1.3 Inspection and Sampling of Materials All materials furnished by the Contractor shall be subject to the examination and approval of the Owner and/or Engineer at any and all times during the progress of the work and until final completion of the same. As soon as the materials are examined and tested, the Contractor shall immediately remove all rejected materials from the work to a point such distance therefrom as the Owner may require. No material shall be used before being examined and approved by the Owner or the Engineer, but the failure on the part of the Owner, or the Engineer, to condemn or reject

Orlando Utilities Commission Section 17 Stanton Energy Center Page 2 of 3 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ inferior materials or work shall not be construed to imply an acceptance of the same should their inferiority become evident at any time prior to final acceptance of the work. The Contractor shall make necessary arrangements so that the Engineer may secure sample specimens of materials on the job for testing to ascertain whether materials included, or to be included, in the work meet the requirements of these Specifications. 17.1.4 Access To Work The Owner and Engineer shall have free access to the work area at all times. The Contractor shall furnish them with tools, equipment, manpower and samples, as needed, for ascertaining whether the work being performed, or the work which has been completed, is in accordance with the requirements of the Specifications, even to the extent of uncovering, testing, or removing portions of finished work, if such is necessary. 17.1.5 Suspension of Work The Owner may order the Contractor to suspend any work that may be affected, damaged, or endangered by climatic conditions. Further, the Owner may temporarily suspend any work at any time when acceptable results as defined in the Specifications cannot be obtained due to inclement weather or other unsatisfactory field conditions. 17.1.6 Utilities and Contractors Facilities Utilities, electricity and fuel as may be required for construction and other purposes shall be secured and purchased by the Contractor. The Owner will make space available for Contractor’s facilities for storage and for trailers. Fresh water (for non-potable use) will be provided at a location designated by the Owner. 17.2 Drawings and Specifications The Drawings and Specifications are intended to be coordinated. Anything shown on the Drawings but not mentioned in the Specifications, or vice-versa, or anything not expressly set forth in either, but which is reasonably implied, shall be furnished as though specifically shown and mentioned in both without any extra charge. Should anything be omitted from the Drawings, which is the subject of the Contract between the Owner and the Contractor, it shall be the duty of the Contractor to so notify the Owner before signing the Contract. The Contractor shall furnish such detailed plans and drawings as may be required for the execution of the work and which are not included in the Drawings furnished by the Engineer on behalf of the Owner. They shall include shop details. Shop drawings prepared by a subcontractor or supplier shall first be checked by the Contractor for compliance with these Specifications, and shall be initialed by the Contractor, prior to submittal to the Engineer for review and approval. The Contractor shall submit all drawings and schedules with the supporting information for the Bid and again sufficiently in advance of construction requirements to allow ample time for checking, correcting, resubmitting, and rechecking. No claim by the Contractor for delays, arising from his failure in this respect, shall be allowed.

Orlando Utilities Commission Section 17 Stanton Energy Center Page 3 of 3 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ All drawings submitted by the Contractor must bear the stamp of approval by the Contractor as evidence that the drawings have been checked by the Contractor. The approval by the Engineer of drawings submitted by the Contractor shall be only for conformance with the design of the project and shall not relieve the Contractor from the responsibility for adherence to the Contract, nor shall it relieve him of the responsibility for any error which may exist. 17.3 Engineering Data The Contractor must form his own opinion of the character of the work and of the soil materials, and must satisfy himself with his own investigations, explorations, tests or studies, of the conditions affecting the work to be done. The Contractor must assume all responsibility for deductions and conclusions as to the nature or condition of the in-place soil, borrow materials, and subsurface water conditions. 17.4 Right to Change Location and Drawings When additional information regarding the topography, subsurface or pore water, or other conditions become available as a result of excavation, testing, data, or other work, the Engineer may find it desirable to change alignment, dimensions, or design of a portion of the work to conform to the newly disclosed conditions. Toward this end the Owner reserves the right to make any such reasonable changes and the Contractor's operations shall be conducted so as to accommodate reasonable changes without additional expense. 17.5 As-Built Drawings The Contractor shall maintain one set of prints on the job site at all times for the preparation of As-Built Drawings. This set will be in addition to any sets needed and used in the actual construction operation. The As-Built Drawings are to be kept up to date by the Contractor, as approved by the Owner, on a daily basis. The plans shall show the actual as-built condition. As-built Drawings shall be submitted to the Owner upon final acceptance of the work.


SPECIFICATIONS

SECTION 18 CONSTRUCTION SCHEDULE




18.1 Work Hours The Contractor shall work all necessary hours required to meet the project completion schedule and ensure that all areas are properly maintained at all times during the work. 18.2 Schedules The Contractor shall submit with the supporting information for the Bid, and again at the first construction meeting, the anticipated rate of progress of cut-off wall installation (square feet per day) and drain installation (linear feet per day), and a detailed construction schedule for the project in the form of a bar chart. The schedule shall be submitted in Microsoft Project scheduling software, software that is 100 percent compatible with Microsoft Project, or other software approved by the Owner. The schedule shall include the specific period of each work task. In addition, the schedule shall include submittals requiring Owner or Engineer approval before delivery to the site (e.g., shop drawings, product specification sheets, product samples, etc.). 18.3 Construction Duration The Contractor shall mobilize labor, material and equipment as needed to ensure completion of construction of the project within 75 calendar days after award of the Contract.


SECTION 19 FINAL INSPECTION AND ACCEPTANCE




19.1 Final Inspection Upon completion of all clean-up operations, the Contractor shall advise the Owner that he is ready for final inspection. The Owner will then set a specific date and time for the final inspection. The Owner, Engineer and Contractor will jointly inspect the project area to verify that all work has been completed in accordance with the Drawings and Specifications. Any work found lacking in any way shall be corrected by the Contractor and subsequently re-inspected. 19.2 Letter of Acceptance The Owner will issue a Letter of Acceptance for the work to the Contractor once all work has been satisfactorily completed and inspected. Final payment can be requested by the Contractor after receipt of the Letter of Acceptance. 19.3 Material and Workmanship Warranties Warranties for materials and workmanship shall take effect from the date of the Letter of Acceptance.


SECTION 20 SCHEDULING AND COORDINATION




All scheduling and coordination of the work shall be undertaken through the OUC representative assigned to the work. 20.1 Pre-Construction Coordination Meeting There will be at least one coordination meeting with the Contractor and Subcontractor(s), the Engineer, and the Owner after the work is awarded and before construction is started.

The Contractor shall submit a construction schedule to the Owner at the first coordination meeting. The schedule shall be in the form of a bar chart showing all construction activities, and shall be updated weekly and provided to the Owner as the work progresses. The Contractor shall also designate a project manager at the first coordination meeting. Each of the Contractor’s and Subcontractor(s)’ designated Site Supervisors shall also attend the coordination meeting. 20.2 Correspondence with Owner All correspondence with the Owner shall be directed to the following address:

Orlando Utility Commission Stanton Energy Center 5100 Alafaya Trail Orlando, FL 32831-2005 Attention: Mr. Charlie Doud, P.E. Telephone: 407-434-4289 (office); 407-719-6055 (cell)

E-mail: [email protected]

Orlando Utilities Commission Section 20 Stanton Energy Center Page 2 of 2 Combustion Waste Storage Area Runoff Pond Cut-Off Wall Revision P1 File Number 12-13-0166 May 3, 2013 ____________________________________________________________________________ Correspondence with Engineer All questions and correspondence regarding the Drawings and Specifications shall be directed to the Engineer, Ardaman & Associates, Inc., at the following address:

Ardaman & Associates, Inc. Post Office Box 593003 Orlando, Florida 32859-3003 Package Delivery: 8008 South Orange Avenue Orlando, Florida 32809 Attention: Mr. Mohamad Al-hawaree, P.E. Telephone: 407-855-3860 Cell: 407-467-8282 Facsimile: 407-859-8121 E-mail: [email protected] 20.4 Coordination by the Contractor, Subcontractor(s) and Suppliers Construction by other contractors will be on-going at the site as part of CWSA runoff pond replacement. The schedule and activities of the Contractor and Subcontractor(s) shall be approved by and coordinated with the Owner to avoid conflicts with other contractors. No contractor will be allowed additional payment for any delays in his work not coordinated through and approved by the Owner.

Attachment IV

OUC GENERAL CONDITIONS OF CONSTRUCTION CONTRACT




THE GENERAL CONDITIONS OF THE CONSTRUCTION CONTRACT IS BEING PROVIDED BY THE OWNER

Attachment V

SITE SAFETY RULES




OUC’S CONTRACTORS SAFETY MANAGEMENT POLICY WILL BE

PROVIDED BY OWNER

Attachment VI

INFORMATION TO BIDDERS


