31_23_11_Earthwork_for_Canal_and_Structures_Rev_3_0002.pdf

Florida Consolidated Ditch Company Florida Ditch and Canal Lining Phase 2, Part 1

Earthwork for Canal and Structures

31 23 11 - 1

SECTION 31 23 11

EARTHWORK FOR CANAL AND STRUCTURES

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Earthwork for Canal:

1. Measurement: Length along centerline of canal.

a. Excludes earthwork for structures and gravel surface.

2. Payment: Linear foot offered in the Price Schedule for earthwork for canal. The unit price shall include the cost of all labor, equipment and materials, unless otherwise stated, required for performing the earthwork along the canal.

a. Include the cost of all work required for:

1) Clearing and grubbing

2) Excavation within the canal

3) Disposal of excavated materials not suitable for construction

4) Processing

5) Traffic Control, if needed

6) Furnishing free draining material (Class 1 aggregate base course)

7) Hauling

8) Placing and compacting earth materials.

9) Placing CLSM for temporary termination anchor trench for end of Phase 1 as shown on Drawing No. 519-417-59.

10) Placing and compacting fill in anchor trenches for the geotextile and PVC canal lining as shown on Drawing No. 519-417-53.

11) Reestablishing existing delivery ditches on the left side of the canal that are disturbed during construction and establishing new field ditches on the right side of the canal to carry water to the drain inlets.

12) Replacing PVC delivery pipelines damaged during construction or relocating the delivery pipeline as required.

31 23 11 - 2

a) A specific delivery pipeline that exists is an 8-inch PIP pipe that located at approximate Sta. 35+50 for a length of approximately 150 feet. The pipeline is likely to be damaged during construction of the O&M road as the road begins at the existing driveway and shared road as it is transitioned in grade and alignment back to a typical canal O&M road.

b. Overexcavation performed beyond specified or directed paylines shall be at the expense of the Contractor.

c. No payment will be made for excavation or removal of material which is outside the specified or directed pay lines unless such excavation or removal is directed by the COR.

d. If in the opinion of the COR, the subgrade at the planned cut is suitable for construction of the new canal lining, the Contractor will not be required to remove this material.

e. If in the opinion of the COR, the subgrade beyond 6-inch depth is unsuitable, the COR will direct the Contractor to perform Additional Excavation.

3. Estimated Quantities: The estimate based on neatlines shown on the drawings and/or using a computer-generated surface model of the project is shown in the table below.

a. Excavation for the Typical Canal Section is shown on Drawing No. 519- 417-53 and 54.

31 23 11 - 3

Table 31 23 11A - Canal Earthwork Quantities to Subgrade of 6” Layer of Free Draining Material

Canal Section

(A)

Waste Excavation Material

Cubic Yards

(B)

Total Fill Required

(C)

Excavation Material Capable of Being Used from Required

Excavation

(D)

Net Balance

Start to Culvert 1 300 233 406 -173

Culvert 1 to Culvert 2 668 1,318 198 1,120

Culvert 2 to Culvert 3 443 1,002 1,533 -531

Culvert 3 to Culvert 4 632 3,254 2,159 1,095

Culvert 4 to Culvert 5 1,075 1,937 3,513 -1,576

Culvert 5 to End 518 4,252 858 3,394

Total 3,636 11,995 8,665 3,330

1) Column A, Waste Excavation Material:

a) Quantities are based on an estimated varying depth of concrete chunks, boulders, and cobble greater than 6 inches along the alignment of the canal to be hauled to and dumped along the alignment of the Florida Canal O&M road south of Pastorius Reservoir. Locations of placements will be directed by C shown in Section 51 00 00 1.03.

b) Volumes shown in Column A also include intermixed volumes of sand, gravel, and cobbles smaller than 6 inches.

The contractor may screen this material to be used as fill below the Class 1 aggregate base layer and outside the canal prism. The Government estimates that 1,200 of the 3,636 cubic yards from Column A could be screened and used as fill.

c) Cobble and riprap from Column A may also be used for earth transition from Sta. 1+00 to 1+10. Minimum riprap and cobble shall be 6-inch D50.

31 23 11 - 4

2) Column B, Total Fill Required:

a) Quantities include the material needed to fill the typical canal section up to the subgrade of the free draining material after excavation of Column A.

3) Column C, Excavation Material Capable of Being Used from Required Excavation:

a) Quantities include in-situ material that is to be excavated to shape the typical canal prism and is assumed to be acceptable fill material.

b) Quantities do not include material from Column A, therefore, total estimated excavation is Column A and Column C combined.

c) Excludes the volume of excavation required for drain inlet trenches, liner anchor trenches, and canal underdrain trench.

d) Quantities listed in Column C do not include possible waste material from screening.

4) Column D, Net Balance

a) Quantities are the difference between Column B and Column C. A negative (-) quantity denotes more fill material is available than required for that section, and a positive quantity denotes that fill will need to be imported for the section.

b) Quantities do not include material from Column A.

b. Total free draining material for the Typical Canal Section shown on Drawing No. 519-417-53:

1) Approximately: 3,266 cubic yards.

B. Canal Underdrain:

1. Measurement: Length along pipe invert. Excludes lengths of horizontal directional drilling.

2. Payment: Linear feet price offered in Price Schedule.

a. The unit price shall include all cost of labor, equipment and materials (unless otherwise specified) for:

1) See Plan and Profile Drawing No.s 519-417-23 through 36 and Drawing No. 519-417-53.

b. Furnishing and installing non-woven geotextile fabric.

31 23 11 - 5

c. Furnishing and placing gravel for the canal underdrain material.

d. Furnishing and placing and additional 12-inch layer of canal underdrain gravel and geotextile in the canal invert and to the left over to the undisturbed surface of the canal between Sta. 100+70 to Sta. 101+00 as shown on Drawing No. 519-417-64. This additional gravel is intended to provide the large cottonwood tree with water when present in the canal underdrain system.

e. Furnishing, laying and joining perforated pipe and fittings.

f. Installing solid wall HDPE pipe to daylight and fittings.

3. Estimated Quantities: Based on neatlines shown on the drawings and/or using a computer-generated surface model of the project, the Government estimates:

a. Canal Underdrain Material for the Typical Canal Section shown on Drawing No. 519-417-53:

1) Approximately 525 cubic yards.

C. Earthwork for Cast-in-Place Concrete Structures:

1. Measurement: Lump sum

2. Payment: Lump sum price offered in Price Schedule. The lump sum price shall include the cost of all labor, equipment and materials required for performing the earthwork for cast-in-place concrete structures. The lump sum price shall include excavation, placing and compacting suitable material for foundation, and placing and compacting backfill for:

a. Check 1 and Turnout Box

b. Check 2 and Upstream Turnout

c. Culvert 1 Modifications (Inlet and Outlet)

d. Culvert 3 Modifications (Inlet and Outlet)

e. Culvert 4 Modifications (Inlet and Outlet)

f. Culvert 5 Modifications (Inlet and Outlet)

D. Excavation of Unsuitable Material:

1. Measurement: Volume measured in excavation to the limits and depths directed by the COR.

a. No measurement for payment will be made for excavation or removal of material which is outside the specified or directed pay lines unless such excavation or removal is directed by the COR.

31 23 11 - 6

2. Payment: Cubic yard price offered in the Price Schedule

a. Includes all cost of furnishing equipment, materials and labor required for:

1) Excavating, hauling, stockpiling, and disposing the unsuitable materials.

b. No measurement for payment will be made for excavation or removal of material which is outside the specified or directed pay lines unless such excavation or removal is directed by the COR.

E. Refill Material for Unsuitable Material:

1. Measurement: Volume measured to the limits and depths directed by the COR for excavation of unsuitable material.

2. Payment: Cubic yard price offered in Price Schedule.

a. The unit price shall include the cost of all work connected with the processing, hauling, placing and compacting refill material.

b. No payment will be made for compacting refill material required to fill any over-excavation not prescribed by the COR and performed by the Contractor. Placing and compacting refill material in such over-excavation shall be placed by and at the expense of the Contractor.

F. Cost: The cost of all other earthwork as shown on the drawings and required by these specifications, including but not limited to anchor trenches, gravel surfacing, and installing drain pipes shall be included in the applicable price(s) bid in the schedule for the items of work for which earthwork is required.

1.02 DEFINITIONS

A. Additional Excavation: Excavation beyond specified lines as directed by the COR to remove unsuitable foundation material.

B. Earth Materials to be Compacted: Suitable materials from required excavation and off-site commercial sources.

C. Neatline: Volume of materials calculated from dimensions shown on the drawings and does not include shrinkage or swell.

D. Overexcavation: Excavation performed for the convenience, fault, or operation of the Contractor beyond specified or directed additional excavation lines.

31 23 11 - 7

E. Unsuitable Material: In-situ material that inhibits proper installation of liner materials or structures.

F. Refill Material: Suitable furnished material from a off-site commercial source to replace unsuitable material.

G. Rock Excavation:

1. Material that cannot be ripped with a 400 horsepower or larger crawler tractor equipped with a ripper rated for hard rock.

2. Material that cannot be excavated with a 300 horsepower or larger hydraulic excavator, with rock teeth, in areas where it is not feasible for ripping with a crawler tractor.

1.03 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 – Submittals

B. RSN 31 23 11-1: Certification and Laboratory Test Results

1. Provide lab results showing gradation of Class 1 Aggregate Base Course.

PART 2 PRODUCTS

2.01 FREE DRAINING MATERIAL

A. Provide from approved commercial source.

B. Reasonably well-graded mixture cohesionless material conforming to gradation requirements specified in Table 31 23 11 B – Class 1 Aggregate Base Course.

Table 31 23 11 B – Class 1 Aggregate Base Course

U.S. Standard Sieve Size Percent Passing by Square Mesh Sieve 2 ½” 100

2” 95 – 100 #4 60 – 65

#200 5 – 15

2.02 CANAL UNDERDRAIN SYSTEM

A. Geotextile: Geotextile fabric shall meet the requirements of Section 31 32 32.

B. Underdrain Material:

1. Provide from approved commercial source.

2. Reasonably well-graded mixture cohesionless material conforming to gradation requirements specified in Table 31 23 11 C – Underdrain Material Gradation.

31 23 11 - 8

Table 31 23 11 C – Underdrain Material Gradation

U.S. Standard Sieve Size Percent Passing by Weight 1-inch 100

3/4-inch 90-100 3/8-inch 20 – 55

No. 4 0 – 10 No. 200 5 Max.

C. Solid and Perforated Pipe and Fittings:

1. ADS N-12 ST IB, as manufactured by Advanced Drainage Systems Inc., www.ads-pipe.com; or equal, with the following salient characteristics:

a. Meet AASHTO M252, Type S and ASTM F 2642.

b. Dual wall construction with smooth interior and annular exterior corrugations.

1) Meeting ASTM F 2648

2) Manning’s “n” value for use in design: 0.012.

c. Material properties:

1) Engineered compound of virgin polyethylene conforming with the minimum requirements of cell classification 424420C (ESCR Test Condition B) for 4-inch through 10-inch diameter.

d. Pipe dimensions with perforations:

1) I.D.: 8 inch.

2) O.D.: 8.9 inches or greater.

e. Perforations: ASSHTO Class II Perforations.

f. Standard connections: Meet or exceed the soil-tight requirements of

ASTM F 2306.

g. Provide manufacturer’s recommended reducer fitting to connect 8 inch underdrain to 6 inch pipe used in the horizontal directional drilling.

2.03 EXCAVATED MATERIALS

A. The Contractor's operations in excavations shall be such that excavations will yield as much suitable material for use in permanent construction required under these specifications as practicable.

B. Place excavated materials which are too wet for immediate compaction temporarily in stockpiles until moisture content is reduced sufficiently to permit them to be placed in compacted backfill or backfill.

file://IBR4GJOFP003.bor.doi.net/Team$/DCG/210LIB/Gov%20Highline%20Canal/2020%20Specifications/www.ads-pipe.com

31 23 11 - 9

2.04 MATERIAL FOR COMPACTED EMBANKMENT

A. Selected material containing no stones larger than 6 inches in diameter, approved by the COR and obtained from required excavation or approved borrow area.

2.05 MATERIAL FOR BACKFILL

A. Type and amount of material used for backfill, and manner of depositing material shall be subject to approval.

B. Obtain backfill material from required excavations. If sufficient suitable material is not available from this source, obtain additional material from off-site commercial borrow pits.

C. Do not place material in backfill when either the material or the surfaces on which it is to be placed are frozen.

D. Do not use material removed in stripping for backfill material.

E. Do not use expansive clays and shales for backfill material.

F. Backfill material against pre-cast turnout structures shall be compacted and contain no stones larger than 3 inches in diameter.

G. Maximum stone size placed in backfill material not to be compacted: 5 inches in diameter.

2.06 MATERIAL FOR COMPACTED BACKFILL

A. Selected material containing no stones larger than 2 inches in diameter, approved by the COR, and obtained from required excavation or approved area.

PART 3 EXECUTION

3.01 EXCAVATION, GENERAL

A. Excavate structure foundations to elevations shown on the drawings or established by the

COR.

B. Perform excavation in the dry.

C. Do not excavate in frozen materials without written approval.

D. Where excavating in backfill and embankment placed under these specifications, excavate in accordance with applicable provisions for excavation.

E. Blasting: Not allowed.

31 23 11 - 10

F. Preserve material below and beyond established lines of excavation in the soundest possible condition.

1. Damage to work due to the Contractor's operations shall be repaired by and at the expense of the Contractor.

2. Material beyond required or prescribed excavation lines which is loosened by the Contractor's operations shall be removed at the expense of the Contractor.

3.02 SURFACES OF EXCAVATION

A. Except for bottom surfaces of trenches and surfaces of excavation that are to be covered with concrete, sharp points of undisturbed ledge rock will be permitted to extend within the prescribed excavation lines not more than 2 inches.

3.03 PREPARATION OF STRUCTURE FOUNDATIONS

A. Prepare foundations at structure sites by methods which will provide firm foundations for structures.

1. Finish bottom and side slopes of excavation, upon or against which the structure is to be placed, to prescribed dimensions.

2. Moisten and compact prepared surfaces with suitable tools to form firm foundations upon or against which to place the structure.

B. Where unsuitable material is encountered in the foundation for a structure, the COR will direct performance of additional excavation to remove unsuitable material.

1. Refill additional excavation with compacted material in accordance with Section 31 23 02 - Compacting Earth Materials.

3.04 OVEREXCAVATION

A. If foundation material is excavated beyond lines required to receive the structure, fill overexcavation with foundation material and compact in accordance with Section 31 23 02 - Compacting Earth Materials.

B. If foundation material is disturbed or loosened during excavation or otherwise, compact foundation in place or remove and replace it with suitable materials and compacted in accordance with Section 31 23 02 - Compacting Earth Materials.

3.05 DISPOSAL OF EXCAVATED MATERIALS

A. Dispose of excavated materials which are unsuitable for or are in excess of embankment, backfill, or other earthwork requirements, as determined by the COR, as provided in Section 31 23 39 - Disposal of Excavated Materials.

31 23 11 - 11

3.06 PLACING BACKFILL

A. Place backfill to the lines and grades shown on the drawings, or as directed by the COR.

B. Place backfill carefully and spread in uniform layers so that all spaces about rocks and clods will be filled.

C. Backfill trenches to the finished lines of adjacent earthwork.

3.07 COMPACTING BACKFILL AND EMBANKMENT

A. Place, moisten, and compact materials in backfill as provided in Section 31 23 02 - Compacting Earth Materials.

3.08 PROTECTION

A. To provide adequate protection for compacted backfill about a structure, the COR reserves the right to direct the Contractor to place a sufficient amount of backfill or embankment material over compacted backfill within 72 hours after completion of compacting backfill.

B. Locate and protect existing PVC pipe delivery pipelines on the left side of the canal.

Demonstrate pipelines have not been damaged after construction by video inspection or by pumping water through the pipes in presence of COR. Replace or repair pipelines damaged during construction.

C. Preserve and reestablish existing delivery ditches that disturbed during constriction on the left side of the canal.

D. Preserve existing and establish new field ditches as required on the right side of the canal.

END OF SECTION