13-235-SOL-00013.pdf

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SECTION B

Colusa Community Sewer Collection System Improvements IHS Project CA 11-E16

Bid Schedule

The following Bid Schedule is based on estimated quantities required to meet the specifications.

The total extended prices shall be used for bid evaluation purposes only. The actual amount to be paid by the Government under the contract shall be computed on the actual quantities installed at the unit bid prices awarded.

Item Item Description UNIT QTY

UNIT

PRICE

TOTAL

PRICE

1 Mobilization and Demobilization LS 1

Section 02100

2 Dewatering Wells EA 5

Section 02241

3 Dewatering Pump System HR 480

Section 02241

4 Erosion and Sediment Control LS 1

Section 02370

5 Sewer Service Line Pipe and Fittings LF 2100

Section 02538

6 Two-Way Service Line Cleanouts EA 26

7 Service Connection EA 26

8 2" HDPE Low Pressure Sewer Main and Fittings LF 930

Section 02539

8 Grinder Pump Station EA 4

9 Spare Grinder Pump Core EA 2

10 1 1/4" Low Pressure System Service Line LF 343

11 Low Pressure System Lateral Assembly EA 4

12 Low Pressure System Terminal Flushing Assembly EA 1

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13 Septic Tank Abandonment EA 26

Section 02540

14 Sanitary Sewer Main LF 3408

Section 02730

15 Sewer Main Cleanout EA 1

Section 02730

16 Manholes and Covers EA 18

Section 02731

17 Lift Station EA 1

Section 02732

18 4" HDPE Sewer Force Main Pipe and Fittings LF 1790

Section 02734

19 Sewer Force Main Cleanouts EA 3

Section 02734

20 Saw-Cutting Asphaltic Pavement LF 30

Section 02740

21 Asphalt Pavement and Curbing CY 1.5

Section 02740

22 Chain Link Fencing and Gates LF 86

Section 02830

23 Electrical Service LS 1

Section 16100

TOTAL

END OF SECTION B

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SECTION C

SPECIAL PROVISIONS

C.1 SCOPE OF WORK

The work to be done under this contract consists of furnishing all labor, materials, equipment, and supervision necessary to construct community sewer gravity lines, a sewer lift station, sewer force mains, individual sewer service lines system connections, individual grinder pump/sump systems, septic tank abandonments, and other required appurtenances in accordance with the attached drawings and specifications.

C.2 SITE CONDITIONS

The Contractor shall determine actual site conditions with regard to surface vegetation and other miscellaneous obstacles to construction. The Contractor shall perform, at no additional cost, all necessary clearing, grubbing, and disposal of these and other obstacles in order to do work required by the contract.

Locations, materials, and sizes of any utilities shown are approximate only and are not meant to be a complete representation of all utilities actually present. The Contractor shall determine exact locations and details from the responsible utility authority.

C.3 CONTRACT DOCUMENTS

A maximum of 5 sets of contract drawings and specifications will be furnished without charge to the Contractor at award of this contract, except applicable publications incorporated by reference which will be furnished on request at the cost of reproduction.

C.4 DAYS OF WORK

Construction work shall not be normally permitted on Saturdays, Sundays, or Federal holidays. The Contractor may submit a written request to the Project Engineer for permission to work on any Saturday, Sunday, or Federal holiday. Written approval from the Contracting Officer must be obtained before the Contractor may work on any such day.

C.5 LAWS AND PERMITS AFFECTING WORK

The Contractor shall at all times observe and comply with Federal, State, City, and County laws, Tribal ordinances and regulations which in any manner affect the conduct of the work; and all such orders and decrees as exist at the present and which may be enacted later by legislative bodies or tribunals having legal jurisdiction or authority over the work. All other required permits, certificates and licenses shall be obtained by and at the expense of the Contractor. No pleas of misunderstanding or ignorance thereof will be considered. The Contractor shall be wholly responsible for any claim or liability arising from or based on the violation of any such law, ordinance, regulation, order or decree.

C.6 RIGHTS-OF-WAY

The Government shall obtain from the Tribe rights-of-way and easements necessary to install facilities located specifically by the plans and specifications.

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C.7 MAINTENANCE OF UTILITIES AND SITE FACILITIES

The Contractor is responsible to determine the exact location of any and all utilities not specifically located on the plans and to protect them from damage during construction.

Should any utility be damaged or disturbed, the Contractor shall immediately notify the Project Engineer and the owner of the damaged utility. Any and all damage that results from work under the contract shall be promptly repaired at the expense of the Contractor.

During the progress of work, the Contractor shall protect all existing vegetation, structures, sidewalks, streets, mailboxes, ditches, culverts, signposts, fences, driveways, and similar items. If the Contractor must remove or disturb these facilities, provision shall be made to maintain a temporary facility serving the same purpose as that which it was intended to replace. Destruction of vegetation shall be kept to a minimum. Upon completion of the work, the Contractor shall restore all such facilities to a condition at least equal to that existing prior to construction. The Contractor shall not obstruct access to the site.

The Contractor shall perform his work at all times in a manner to ensure minimal obstruction to traffic and minimal inconvenience to the general public.

C.8 CONTRACT SUBMITTAL REQUIREMENTS

The Contractor shall furnish material submittals, design submittals, shop drawings, test reports, and as-built drawings in accordance with the requirements detailed in the Contract Submittal Requirements section.

C.9 CLEANUP AND FINISH GRADING

The Contractor shall restore all areas disturbed by construction to a condition at least equal to that existing prior to construction. Excess construction materials, equipment, tools, waste excavation, and rubbish shall be removed. Excavated areas shall be finish graded to provide drainage as required by the drawings and specifications, or in the absence of specific requirements, to provide drainage away from the facilities constructed and to provide drainage away from excavated areas and installed facilities. Where a lawn is disturbed, the Contractor shall place a generous amount of grass seed to the disturbed area following final grading.

C.10 MEASUREMENT AND PAYMENT

As line item quantities are estimates, contractor will be paid full compensation based upon the actual quantities utilized/completed and verified by the Engineer. The price paid for the completed item of work shall include full compensation for furnishing all labor, materials, tools, equipment, and performing all work required by the provisions of the contract to furnish and install the items of work, completed in place. In all cases, the finished product shall be a complete, operational system or component. The price for the completed item of work shall also include all applicable state and local sales or other taxes.

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C.11 TECHNICAL PROVISIONS

Division 2 – Site Construction

Section Number Title Page

02010 General Requirements 10

02100 Mobilization and De-mobilization 14

02110 Site Clearing 16

02200 Excavating, Trenching, and Backfilling 18

02241 Dewatering 33

02370 Erosion and Sediment Control 41

02538 Sewer Service Lines 46

02539 Low Pressure Sewer System 54

02540 Septic Tank Systems Abandonment 59

02730 Gravity Sewer Mains 62

02731 Manholes and Covers 66

02732 Lift Station 69

02734 Sewer Force Main 76

02740 Flexible Pavement 80

02830 Chain Link Fence 89

02952 Sewer and Manhole Testing 93

02958 Manhole Grout Sealing 100

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Division 3 – Concrete

Section Number Title Page

03300 Cast-in-Place Concrete 103

Division 16 – Site Construction

Section Number Title Page

16100 Electrical Requirements 110

16901 Lift Station Control Panel 123

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SECTION 02010

GENERAL REQUIREMENTS

PART 1 – GENERAL

1.1 SUMMARY

A. Section Includes:

1. Project coordination

2. Asphalt testing and inspection services

3. Soil testing and inspection services

4. Traffic Signage

5. Excavation protection plan

6. Surveying services

B. Related Sections and Materials:

1. Document: Environmental Assessment, Cachil DeHe Band of Wintun

Indians of the Colusa Indian Community, Fee-to-Trust (AES: March 2010).

2. Document: Geotechnical Engineering Report Update: Colusa Casino Resort (WKA: July 2012).

3. Section 02200 – Excavation, Trenching and Backfilling.

4. Section 02740– Flexible Pavement

1.2 UNIT PRICES - MEASUREMENT AND PAYMENT

A. There is no separate payment for work under this Section. Combine work required with pay items defined within measurement and payment portion of other related Sections.

1.3 REFERENCES

A. State of California, Department of Transportation, Trenching and Shoring Manual, August 2011 or latest edition.

B. American Public Works Association Southern California Chapter Work Area

Traffic Control Handbook (Watch Book) 2009, Eleventh Edition.

C. U.S. Department of Transportation Federal Highway Administration Manual on Uniform Traffic Control Devices (MUTCD) for Streets and Highways, 2009 Edition.

D. Applicable references in related Sections.

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1.4 SUBMITTALS

A. Contract Submittal Requirements

B. Submittal Review Form

C. Excavation Protection Plan

D. Materials Testing: Submit name(s) of third-party providing materials testing services. Include qualifications and experience. Test Reports: Submit asphalt and soil testing reports as required in related Sections.

E. Surveying Qualifications: Submit name(s) of firm or personnel providing surveying services. Include qualifications and experience.

1.5 QUALITY ASSURANCE

A. Perform Work in accordance with applicable Tribal, Federal, State-of-California and Colusa County standards.

1.6 QUALIFICATIONS

A. Monitoring: Personnel specializing, certified and/or experienced in monitoring for cultural properties and archaeological sites during ground-disturbing activities specified in related Sections.

B. Surveying: Personnel specializing, certified as a Registered Professional Land

Surveyor in the State of California, and experienced in surveying for construction work. Knowledge and experience with GPS survey grade equipment may be advantageous but is not mandatory.

1.7 DELIVERY, STORAGE AND HANDLING

A. Comply with all manufacturer’s storage and handling requirements for products and materials.

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PART 2 – PRODUCTS

2.1 TRAFFIC SIGNAGE

A. Signage: Conforming to industry standards, the Watch Book, and the MUTCD. In the event of a conflict between the Watch Book and the MUTCD, the MUTCD shall prevail.

1. Type 1, 2, and 3 barricades.

2. Traffic cones.

3. Traffic signage.

PART 3 – EXECUTION

3.1 PROJECT COORDINATION

A. Provide overall operation at the site including scheduling, reporting, monitoring budget, inspection of operations, and workers’ insurance to complete the work.

Obtain NPDES permit for Stormwater Discharge.

3.2 ASPHALT TESTING AND INSPECTION SERVICES

A. Perform asphalt testing and inspection services to meet requirements of related Sections.

3.3. SOIL TESTING AND INSPECTION SERVICES

A. Perform soil testing and inspection services to meet requirements of related Sections.

3.4 TEMPORARY BARRICADES, FENCING, AND PROJECT SIGNAGE.

A. Manage the delivery and placement of temporary barricades, fencing, and signage to meet requirements of related Sections.

B. Utilize temporary barricades, fencing, and signage to provide safe and active sites to complete work and warn, control, and protect vehicular and pedestrian traffic.

C. Manage removal and return of temporary barricades, fencing, and signage as work is completed.

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3.5 EXCAVATION PROTECTION PLAN

A. Make arrangements for the development of an excavation protection plan under the direct supervision of a Professional Engineer experienced in design of this Work and licensed in the State of California.

B. The excavation protection plan should be in compliance with the State of

California, Department of Transportation, Trenching and Shoring Manual (August 2011 or latest edition) located at: http://www.dot.ca.gov/manuals.htm

3.6 CULTURAL PROPERTIES/ARCHAEOLOGICAL MONITORING

A. Verify work requiring cultural properties/archaeological monitoring and coordinate with the Tribe to ensure that a monitor is on-site when required

B. In the event that buried archaeological material, such as flaked stone, historic debris or human remains are inadvertently discovered during ground-disturbing activities, communicate to Tribe and Engineer the requirement to stop work in that area and within the vicinity of the find until a qualified archaeologist can assess the significance of the find.

3.7 SURVEYING SERVICES

A. Verify work requiring surveying services.

B. Notify Engineer a minimum of 72 hours in advance of scheduling surveying firm in order to confirm resource availability.

C. Schedule surveying firm personnel to complete surveying.

D. Provide direction to surveyors in order to perform required surveying controls, stakes, lines, and grades as efficiently as possible.

E. Verify surveying is consistent with intent of Drawings.

F. Protect all survey controls, stakes, marks, and points and re-establish if necessary.

END OF SECTION 02010

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SECTION 02100

MOBILIZATION & DE-MOBILIZATION

1.1 SECTION INCLUDES

A. This section includes mobilization and demobilization to and from jobsite.

1.2 UNIT PRICE - MEASUREMENT AND PAYMENT

A. Mobilization and De-mobilization - Shall be measured and paid by the Lump Sum. Includes all labor equipment and materials to mobilize and demobilize to the project site as many times as is required to complete the work outlined in the contract documents. Limited to no more than 10% of total bid.

NONE

3.1 PREPARATION

A. Make arrangements to contact Colusa Indian Community Council Public Works Department and Tribal Business Center prior to mobilizing on job site location, coordinating a materials/equipment yard, and securing all necessary permits prior to performing work.

B. Notify Project Engineer 48 hours in advance prior to mobilization to job site location.

3.2 MOBILIZATION

A. Move materials, equipment, and laborers as necessary to job site location with minimal disturbance.

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3.3 DE-MOBILIZATION

A. Remove all materials, equipment, laborers, solid waste and debris created by construction activities from job site location.

B. Maintain minimal disturbance to site upon departure.

END OF SECTION 02100

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SECTION 02110

SITE CLEARING

1. Protection of facilities.

2. Clearing site of incidental paving and curbs, surface debris, grass, trees, and other plants.

3. Preparation of site for excavation work.

B. Related Sections:

1. Section 02200 – Excavation, Trenching and Backfilling

2. Section 02370 – Erosion and Sediment Control

A. There is no separate payment for work under this Section. Combine work required with pay items defined within measurement and payment portion of other related Sections.

A. Applicable references in related Sections.

A. Submittals as applicable in related Sections.

A. Perform Work in accordance with applicable Tribal, Federal, State of California or Colusa County standards.

1.6 QUALIFICATIONS

A. None.

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1.7 DELIVERY, STORAGE AND HANDLING

2.1 SITE CLEARING

3.1 PROTECTION

A. Locate, identify, and protect existing facilities (remaining) from damage.

B. Identify and protect trees, plant growth, and features designated to remain as final landscaping.

C. Protect bench marks from damage or displacement.

3.2 CLEARING

A. Clear only those areas required for access to site and execution of work.

B. Remove paving, curbs, and other structures or debris per drawings.

3.3 REMOVAL

A. Remove paving, brush, trees, and other debris and dispose of off-site.

B. Coordinate with Tribe for disposal method and location.

3.4 TOPSOIL EXCAVATION

A. Excavate topsoil from areas to be further excavated or re-graded.

B. Stockpile topsoil in designated area.

1. Protect from erosion.

2. Remove excess topsoil from site.

END OF SECTION 02110

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SECTION 02200

EXCAVATION, TRENCHING, AND BACKFILLING

1. Regulatory requirements, protection, subsoil fill for pipe embedment, structural fill for aggregate subbase and base, excavation, backfilling, compaction, restoration.

1. Section 02110 – Site Clearing

2. Section 02241 – Dewatering

3. Section 02370 – Erosion and Sediment Control

4. Section 02538 – Sewer Service Lines

5. Section 02539 – Low Pressure Sewer System

6. Section 02540 – Septic Tank Systems Abandonment

7. Section 02730 – Gravity Sewer Mains

8. Section 02731 – Manholes and Covers

9. Section 02732 – Lift Station

10. Section 02734 – Sewer Force Main

11. Section 02740 – Flexible Pavement

12. Section 02952 – Sewer and Manhole Testing

13. Section 03300 – Cast-in-place Concrete.

A. Work under this Section shall be combined with pay items defined within other related Sections, except where noted below.

B. Compacting of subsoil and structural fill material listed below is under pay items defined within other related Sections.

C. Subsoil Fill, Pipe Embedment Zone: if necessary is to be combined with pay items defined within other related sections.

D. Structural Fill, Aggregate Subbase: if necessary is to be combined with pay items defined within other related sections.

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E. Structural Fill, Aggregate Base: if necessary is to be combined with pay items defined within other related sections.

A. American Association of State Highway and Transportation Officials:

1. AASHTO T27 - Standard Method of Test for Sieve Analysis of Fine and Coarse Aggregates (ASTM Designation: C136).

2. AASHTO M147 - Standard Specification for Materials for Aggregate and Soil-Aggregate Subbase, Base and Surface Courses.

3. AASHTO T180 - Standard Specification for Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop (ASTM Designation: D1557).

B. ASTM International:

1. ASTM D698 - Test Methods for Moisture-Density Relations of Soils and

Soil-Aggregate Mixtures, Using 5.5 lb (2.5 Kg) Rammer and 12 inch (300

mm) Drop.

2. ASTM D1556 - Test Method for Density of Soil in Place by the Sand-Cone Method.

3. ASTM D1557 - Test Methods for Moisture-Density Relations of Soils and Soil-Aggregate Mixtures Using 10 lb (4.5 Kg) Rammer and 18 inch (450

mm) Drop.

4. ASTM D2922 - Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

5. ASTM D3017 - Test Methods for Moisture Content of Soil and Soil-Aggregate Mixtures.

6. ASTM C136 - Method for Sieve Analysis of Fine and Coarse Aggregates.

7. ASTM D2321 - Recommended Practice for Underground Installation of

Flexible Thermoplastic Sewer Pipe.

C. U.S. Department of Transportation, Federal Highway Administration:

1. Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects (FP-03) with modifications by the Bureau of Indian Affairs (BIA), Pacific Regional Office, Division of Transportation.

D. State of California, Department of Transportation:

1. Standard Specifications, 2010 or latest edition.

1.4 DEFINITIONS

A. Utility: Any buried pipe, duct, conduit, or cable.

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B. Structure: Foundation, manhole, septic tank, cleanout, catch basin, or culvert.

C. Bedding: Material placed directly underneath the pipe that brings the trench bottom to grade to provide a firm, stable and uniform support of the pipe.

D. Haunching: Material placed from the bottom of the pipe to the springline that provides a firm and stable embedment to limit pipe deflections.

E. Initial Backfill: Material placed above the springline of the pipe to a level 6 inches above the top of the pipe or in accordance with the Drawings.

F. Embedment Zone: Material placed as bedding, haunching, and initial backfill.

G. Final Backfill: Material placed above the initial backfill to a level below that required for the trench area restoration.

H. Solid Rock: Large continuous masses of igneous, metamorphic, or sedimentary rock, which, in the opinion of the Engineer, cannot be excavated without drilling and blasting or other mechanical means. Soil that is capable of being excavated with rippers is not considered solid rock.

I. Loose Rock: Boulders and other detached stones with a minimum volume of 1 cubic yard.

1.5 SUBMITTALS

A. Contract Submittal Requirements and Submittal Review Form

B. Excavation Protection Plan: Describe sheeting, shoring, and bracing materials and installation required to protect excavations and adjacent structures and property;

include calculations to support plan.

C. Trenching Plan: Indicate proposed plan of trenching excavation and delay pattern.

D. Product Data: Submit data for geotextile fabric indicating fabric and construction.

E. Samples: For on-site production, submit, in air-tight containers, 10 lb sample of each type of fill to testing laboratory.

F. Materials Source: Submit name of imported fill materials suppliers.

G. Manufacturer's Certificate: Certify Sub

H. Soil Fill and Structural Fill meet or exceed specified requirements.

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I. Compaction Certificate: Certify compaction methods meet or exceed specified requirements.

1.6 QUALITY ASSURANCE

A. Perform Work in accordance with applicable Tribal, Federal, State-of-California

B. Tribe to coordinate requirements and approval from the Bureau of Indian Affairs

(BIA)’s roads authority prior to construction.

C. Compaction Demonstration:

1. At the start of the work, select a section to serve as a test trench to demonstrate methods, equipment, and materials which will reliably achieve the required compaction and in lifts less than or equal to the maximum specified. The location and length of trench shall be representative of the work and approved by the Engineer.

2. The Engineer may increase the maximum allowable lift thickness permitted and/or reduce the frequency of compaction testing based upon the results demonstrated by the test section.

3. Should subsequent testing demonstrate that the required compaction is not being reliably achieved; the Engineer may reduce the maximum lift thickness and increase the frequency of compaction testing to its original value.

4. Any method or equipment which fails to uniformly achieve the required levels of compaction throughout the length and depth of the trench shall be discontinued.

5. Compaction equipment and methods shall be such as not to damage the installed pipe or other facilities, exceed its load capacity, or disturb its alignment.

D. Maintain one copy of all applicable permits on site.

1.7 QUALIFICATIONS

A. Prepare excavation protection plan under direct supervision of Professional Engineer experienced in design of this Work and licensed in State of California.

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1.8 FIELD MEASUREMENTS

A. Verify field measurements prior to fabrication.

1.9 COORDINATION

A. Verify Work associated with lower elevation utilities is complete before placing higher elevation utilities.

2.1 FILL MATERIALS

A. Subsoil Fill:

1. For pipe bedding, haunching, and initial backfill (pipe embedment zone).

2. Imported borrow or local borrow.

3. Free of clay or organic material.

4. Graded with the following gradation:

Sieve Size Percent Passing by Weight

1-inch 100 3/4-inch 90 – 100

No. 4 50 – 95 No. 30 25 – 45 No. 200 3 – 15

B. Structural Fill – Aggregate Subbase (AS):

1. For road zone below aggregate base.

2. Imported or local borrow.

3. Conforming to Caltrans Aggregate Subbase (AS) Class 2; State of

California, Department of Transportation, Standard Specifications, Section 25.

4. Graded with the following gradation (Operating Range):

3-inch 100

2 1/2-inch 90 – 100 No. 4 40 – 90

No. 200 0 – 25

C. Structural Fill – Aggregate Base (AB):

1. For road zone, below pavement, and other structures.

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2. Imported or local borrow.

3. Hard, durable particles or fragments of crushed stone or gravel. Free from vegetable matter or other deleterious substances, and readily compacted under watering and rolling to a firm, stable base.

4. Conforming to Federal Highway Administration, FP-03, Section 301 (as modified by the BIA, allowable deviation range within Caltrans Aggregate Base (AB) Class 2; State of California, Department of Transportation, Standard Specifications, Section 26).

5. Graded with the following gradation (3/4-inch Maximum Operating Range):

1-inch 100 3/4-inch 87 – 100

No. 4 30 – 60 No. 40 5 – 35 No. 200 0 – 12

D. All other trench zone material shall consist of native material meeting the following requirements:

1. Free of organic or deleterious material; less than 5% by volume.

2. Less than 3-inches in maximum dimension.

E. Drainage Rock:

1. For drainage of facilities and roads.

2. Local borrow.

3. Graded with the following gradation:

2-inch 100

3/4-inch 35 – 70 No. 4 0 – 5

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F. Cement Slurry Fill:

1. Fluid, workable mixture of aggregate, cement, and water that will flow without segregation of the aggregate while being placed.

2. Water shall be free from oil, salts, and other impurities which would have an adverse effect.

3. Not less than 188 lbs. of cement shall be used for each cubic yard of material produced.

4. Aggregate shall be graded with the following gradation:

1 1/2-inch 100

1-inch 80 – 100 3/4-inch 60 – 100 3/8-inch 50 – 100

No. 4 40 – 80 No. 100 10 – 40

2.2 ACCESSORIES

A. Geotextile Fabric: Non-biodegradable.

1. Used in conjunction with subsoil fill as an underlayment for pipe in roads and for separation fabric (underlayment) for lift station wet well, valve vault, and gravel surface at lift station site.

2. TC Mirafi; Model 500X.

3. Substitutions: Permitted.

3.1 LINES AND GRADES

A. Lay pipes to lines and grades indicated on Drawings.

1. Engineer reserves right to make changes in lines, grades, and depths of utilities when changes are required for Project conditions.

B. Use laser-beam instrument with qualified operator to establish lines and grades.

3.2 PREPARATION

A. Call Local Utility Line Information service not less than three working days before performing Work.

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1. Request underground utilities to be located and marked within and surrounding construction areas.

B. Identify required lines, levels, contours, and datum locations.

C. Protect plant life, lawns, and other features remaining as portion of final landscaping.

D. Protect bench marks, existing structures, fences, paving, and curbs from excavating equipment and vehicular traffic.

E. Maintain and protect above and below grade utilities indicated to remain.

F. Establish temporary traffic control and detours when trenching is performed in public right-of-way. Relocate controls and reroute traffic as required during progress of Work.

3.3 CLASSIFICATION OF EXCAVATION TRENCHING

A. All excavation with equipment commonly used in the industry is classified as common excavation (except for drilling and blasting).

B. All material drilled and blasted for removal is classified as rock excavation.

Inform the Project Engineer prior to rock excavation to determine pay measurement.

3.4 EXCAVATION TRENCHING

A. Excavate subsoil required for utilities.

B. Use open cut method on all excavation unless otherwise shown on the drawings, required by permit, or approved in writing by Engineer.

C. Stockpile excavated material in designated area on site and remove excess material from site.

D. Grade top perimeter of excavation to prevent surface water from entering.

E. Excavation trenches to depth indicated on drawings. Provide uniform and continuous bearing and support for bedding material and pipe.

F. Cut trenches sufficiently wide to enable installation and inspection. Remove water or materials that interfere with work.

G. Maintain trench sides as vertical as possible.

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H. Excavate bottom of trenches maximum 24 inches wider than the outside diameter of the pipe

I. Center trench excavation on pipe alignment for a minimum clearance of 6 inches on each side of the pipe.

J. Excavate trench width above the pipe as wide as necessary for shoring, sheeting, and installation.

K. Hand trim for bell and spigot pipe joints. Remove loose matter.

L. Restore over-excavated areas. If the trench bottom is over-excavated below the intended grade, fill over-excavation with imported pipe embedment and compact to density equivalent to the in-situ material.

M. Remove lumped subsoil, boulders, and rock up to ½ yd3 measured by volume.

N. Excavate for additional trench depth when soil prevents adequate pipe support.

Refill addition with imported pipe embedment. Remove large rock, boulders, and large stones to provide 3 inches of soil cushion on all sides of the pipe and pipe accessories.

O. Length of trench that may be left open at any one time is 100 yards. Do not leave trench open overnight.

P. Stockpile excavated material in designated area on site, and remove excess material from site.

3.5 SEPARATION OF WATER AND SEWER PIPE

A. Horizontal: Water and sewer pipe shall be separated by at least 10 feet, measured inside edge to edge. In cases where this separation is unattainable, water and sewer pipe may be closer if the water pipe is vertically above the sewer pipe by at least 18-inches and located in a separate trench or on an undisturbed earth shelf.

B. Crossings: In all cases where water and sewer pipe cross, one full length of the new pipe (minimum 20-foot section) shall be centered on the crossing.

C. Vertical: Water pipe crossing sewer pipe shall be laid at least 18-inches above the top of the sewer pipe, measured pipe to pipe. If water crossing above sewer is unattainable, the minimum vertical separation shall be 18-inches and if the sewer pipe has non-resilient joints, lengths between joints less than 10 feet or shows evidence of damage or leakage the sewer pipe shall be replaced with one full length of PVC or ductile sewer pipe with resilient joints sized to exactly match the existing pipe diameter.

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D. Service Line Separation: Water and sewer service pipes shall meet the horizontal separation requirements listed above, except where water and sewer services unavoidably must enter the building with less than 10 foot separation, the services shall diverge to achieve the required separation within 10 feet of the building wall. Water and sewer services crossing other service or pipe shall meet the vertical separation requirements listed above, except PVC water pressure pipe (minimum 10-foot length) shall be used as encasement for sewer services crossing above water pipelines. Sewer services may also be laid between 18-inches and 12-inches below water mains or services if the sewer service is similarly encased.

3.6 STRUCTURE EXCAVATION

A. Excavate for structures down to the levels indicated on the drawings. Excavate as large as necessary to accommodate the work forms. Comply with all safety regulations.

B. Excavate a sufficient distance from walls and footings to provide forming except where concrete for walls or footings is directly against excavated surfaces.

C. Do not excavate below depths indicated in drawings. Restore over-excavated areas to proper elevation by filling with imported structural fill. Do not interfere with 45 degree bearing splay of foundations.

D. Hand-trim bottom of the excavation to prevent disturbing soil below the required depth.

3.7 SHEETING AND SHORING

A. Sheet, shore, and brace excavations to prevent danger to persons, structures and adjacent properties and to prevent caving, erosion, and loss of surrounding subsoil.

B. Support trenches more than 5 feet deep excavated through unstable, loose, or soft material. Provide sheeting, shoring, bracing, or other protection to maintain stability of excavation.

C. Design sheeting and shoring to be removed at completion of excavation work.

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D. Repair damage caused by failure of the sheeting, shoring, or bracing and for settlement of filled excavations or adjacent soil.

E. Repair damage to new and existing Work from settlement, water or earth pressure or other causes resulting from inadequate sheeting, shoring, or bracing.

3.8 BACKFILLING

A. Backfill trenches to contours and elevations with unfrozen fill materials.

B. Systematically backfill to allow maximum time for natural settlement. Do not backfill over porous, wet, frozen, or spongy sub-grade surfaces.

C. Place geotextile fabric in areas indicated on the Drawings prior to placing subsequent fill materials.

D. Place fill material in continuous layers and compact in accordance with schedule at end of this section.

E. Backfill in uniform layers not to exceed 6 inches, unless demonstrated methods, equipment, and materials reliably indicate required compaction in greater lifts.

F. Employ placement method that does not disturb or damage utilities in trench.

G. Maintain optimum moisture content of fill materials to attain required compaction density.

H. Protect open trench to prevent danger to the public.

3.9 TRENCH BACKFILLING

A. Use excavated soil as embedment unless Engineer determines it unsuitable.

Unsuitable material is defined as incapable of being compacted to specified density with optimum moisture content, solid or loose rock, and material not suitable for pipe embedment zone as specified above.

B. Place a 6-inch layer of embedment over the top of the pipe unless otherwise identified in Drawings or specified by Engineer.

C. Use excavated soil as final backfill unless Engineer determines it unsuitable.

Unsuitable final backfill material is solid or loose rock larger than 3 inches. Do not use organic matter or debris.

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D. Backfill pipe embedment material in uniform layers on all sides of the pipe in lifts not to exceed 6 inches.

E. Place final backfill material by the following methods, unless otherwise required by permits, authority, or by demonstrated methods, equipment, and materials reliably indicating required compaction in greater lifts.

Location Not To Exceed (in loose measure)

Roadways 6-inches thick Rights-of-way and outside roadway 12-inches thick

Unimproved surfaces 24-inches thick

F. Temporary backfilling shall be placed to the measurement specified for unimproved surfaces unless otherwise specified by Engineer.

3.10 STRUCTURE BACKFILLING

A. Subgrade to receive aggregate base, immediately prior to spreading, shall conform to the compaction and elevation tolerances specified and shall be free of loose or extraneous material.

B. Place structure fill material in uniform layers on all sides of the structure 6 inches thick.

C. Do not fill structure material until the structure footing or other portions of the structure have been inspected by Engineer.

D. Use excavated soil as final backfill material unless Engineer determines it unsuitable. Unsuitable final backfill material is solid or loose rock larger than 3 inches. Do not use organic matter or debris.

3.11 CEMENT SLURRY BACKFILLING

A. Maintain a minimum of 6 inches clear distance between the outside of pipe and the side of the excavation for pipes 42-inches in diameter and smaller.

B. Compacted earth plugs or other suitable system shall be placed at the ends of the trench to receive slurry backfill to completely contain the slurry in the trench.

C. Place cement within 1 hour after mixing.

D. Place in a uniform manner that will prevent voids in, or segregation of, the backfill, and will not float or shift the pipe.

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E. Backfilling over or placing any material over the slurry cement backfill shall not commence until 4 hours after the slurry has been placed, except that when concrete sand is used for the aggregate and the in-place material is free draining, back filling may commence as soon as the surface water is gone.

F. Cement slurry backfill shall not be used where it will be in contact with aluminum and aluminum coated materials.

3.12 COMPACTION

A. Compact to the percentage of maximum density determined by ASTM D1557 as specified below unless otherwise required by permit or authority.

Location Bedding Haunching Initial

Backfill Final

Backfill Roadways, improved surfaces 95% 95% 95% 95%

Roadway rights-of-way outside of roadway prism

90% 90% 90%

90%

Unimproved Surfaces, fields

90% 90% 90% 90%

Around structures 95% 95% 95% 95%

B. In roadways and improved surfaces, compact with steel or pneumatic rollers.

C. Temporary backfilling shall be compacted to the percentage specified for unimproved surfaces unless otherwise specified by the Engineer.

3.13 TOLERANCES

A. Top Surface of Backfilling Under Paved Areas: Plus or minus 1-inch from required elevations.

B. Top Surface of General Backfilling: Plus or minus 1-inch from required elevations.

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3.14 FIELD QUALITY CONTROL

A. Perform testing in accordance with the following:

1. In-Place Compaction Testing: For all trenching and excavation in roadways, roadway rights-of-ways, and around structures.

2. Visual Inspection: For all trenching and excavation in unimproved surfaces and fields unless otherwise directed by Engineer.

3. Additional Testing: Additional testing, at the discretion of the Engineer, may be performed at locations approved by Engineer.

B. Perform laboratory material tests in accordance with ASTM D1557. Prior to construction of work, perform the following:

1. Perform tests on 10 soil samples.

2. Locations approved by Engineer.

3. Submit test results to Engineer.

C. Roadway Locations: Perform minimum sampling and testing for quality control in accordance with the following:

1. Roadways.

2. At least 75 percent of all covered areas shall equal or exceed the required thickness and no area shall vary by more than ¼ inches.

3. Minimum Sampling and Testing for Quality Control:

Material Characterist ic Point of

Sampling Test

Methods Sampling Frequency

Aggregate Base/Subbase /Embedment

Gradation Roadway

AASHTO

T27/ASTM

C136

5 per day

In-place density

Anywhere on roadway

AASHTO

T180/ASTM

D1557

1/300 ft per lift

Thickness test hole

Anywhere on roadway

1/300 ft

E. Other Locations: Perform in-place compaction tests in accordance with the following:

1. Density Tests (in-place): ASTM D1556 (sand cone method) or ASTM D2922 (nuclear method).

2. Moisture Tests (in-place): ASTM D3017 (nuclear method).

3. Minimum Sampling and Testing Quality Control:

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a. Pipe Trench: Average of one test per 1,000 feet at depth and location approved by Engineer. Minimum one acceptance test per project for aggregate base and aggregate subbase.

b. Other Areas (such as trenchless construction pit): Average of one test per 400 square feet, with a minimum of one test for each area, at depth and location approved by Engineer.

4. Coordinate required test methods with geotechnical report.

F. When tests indicate Work does not meet specified requirements, perform additional work as may be necessary to attain the specified condition, which could include remove, replace, and compact. Retest Work.

G. All testing performed by a firm regularly engaged in soil testing and licensed and bonded in the State of California.

3.15 PROTECTION OF FINISHED WORK

A. Reshape and re-compact fills subjected to vehicular traffic during construction.

3.16 PROTECTION OF FINISHED WORK

A. Restore the sidewalks, curbs, and gutters to their original condition. Comply with the standards and construction requirements of the local authority.

B. Machine compact backfill under the sidewalk as follows:

1. Cut the existing curb or sidewalk to a neat line.

2. Match the depth of base course material with that present under adjacent curbs or sidewalks.

3. Match to the existing concrete walk in width, thickness, slope, and finish, but not less than 4 inches in thickness.

4. Use wire mesh reinforcement; 6 inch by 6 inch.

END OF SECTION 02200

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SECTION 02241

DEWATERING

1. Dewatering system.

2. Surface water control system.

3. Monitoring wells.

4. System operation and maintenance.

5. Water disposal.

1. Section 02200 – Excavation, Trenching, and Backfilling.

2. Section 02370 – Erosion and Sediment Control.

A. Dewatering Wells:

1. Basis of Measurement: By each.

2. Basis of Payment: Includes drilling, well casing, well screen, riser pipe, and filter sand.

B. Dewatering Pump System:

1. Basis of Measurement: By hour.

2. Basis of Payment: Includes pump, power unit, fuel, piping, discharge header pipe, connections, fittings, controls, pump operation and maintenance, and standby equipment.

A. ASTM International:

1. ASTM C33 - Standard Specification for Concrete Aggregates.

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1.4 DEFINITIONS

A. Dewatering includes the following:

1. Lowering of ground water table and intercepting horizontal water seepage to prevent ground water from entering excavations and trenches.

2. Reducing piezometric pressure within strata to prevent failure or heaving of excavations and trenches.

3. Disposing of removed water in the on-site retention basin.

B. Surface Water Control: Removal of surface water within open excavations.

1.5 SYSTEM DESCRIPTION

A. Provide dewatering and surface water control systems to permit Work to be completed on dry and stable subgrade.

B. Furnish standby equipment stored at Project site and ready for immediate use upon failure of dewatering equipment. Provide the following standby equipment, but not less than one of each type:

1. Dewatering Pumps: 100 percent.

2. Portable Electric Generators: 100 percent.

1.6 PERFORMANCE REQUIREMENTS

A. Design dewatering systems to:

1. Lower water table within areas of excavation to minimum 2 feet below bottom of excavation to permit Work to be completed on dry and stable subgrade.

2. Relieve hydrostatic pressures in confined water bearing strata below excavation to eliminate risk of uplift or other instability of excavation.

3. Prevent damage to adjacent properties, buildings, structures, utilities, and facilities from construction operations.

4. Prevent loss of fines, quick condition, or softening of foundation subgrade.

5. Maintain stability of sides and bottoms of excavations and trenches.

B. Design surface water control systems to:

1. Collect and remove surface water and seepage entering excavation.

1.7 SUBMITTALS

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B. Shop Drawings:

1. Indicate dewatering system layout, well depths, well screen lengths, dewatering pump locations, pipe sizes and capacities, grades, filter sand gradations, surface water control devices, valves, and water disposal method and location.

2. Indicate primary and standby power system location and capacity.

3. Indicate layout and depth of monitoring wells, piezometers and flow measuring devices for system performance measurement (if any).

4. Include detailed description of dewatering and monitoring system installation procedures and maintenance of equipment.

5. Include description of emergency procedures to follow when problems arise.

C. Product Data: Submit data for each of the following:

1. Dewatering Pumps: Indicate sizes, capacities, priming method, and motor characteristics.

2. Pumping equipment for control of surface water within excavation.

D. Design Data:

1. Indicate design values, analyses, and calculations to support design.

2. Include description and profile of geology, soil, and groundwater conditions.

E. Field Reports: Test and monitoring reports as specified in Field Quality Control article.

1.8 CLOSEOUT SUBMITTALS

A. Project Record Documents: Record actual locations and depths of capped wells and piping abandoned in place.

1.9 QUALITY ASSURANCE

A. Comply with authorities having jurisdiction for the following:

1. Drilling and abandoning of wells used for dewatering systems.

2. Water discharge and disposal from pumping operations.

B. Obtain permit from USEPA under National Pollutant Discharge Elimination

System (NPDES), for storm water discharge from construction sites.

C. Perform Work in accordance with State of California Department of

Transportation standard.

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1.10 QUALIFICATIONS

A. Installer: Company specializing in performing work of this section with minimum three years documented experience and responsible for design, operation, and maintenance of dewatering system.

1. Assume sole responsibility for dewatering and surface water control systems and for loss or damage resulting from partial or complete failure of protective measures and settlement or resultant damage caused by ground water control operations.

1.11 PRE-INSTALLATION MEETINGS

A. Convene minimum one week prior to commencing work of this section.

1.12 SEQUENCING

A. Sequence work to obtain required permits before start of dewatering operations.

B. Sequence work to install and test monitoring systems minimum 7 days before testing and operating dewatering systems (if any).

C. Sequence work to install and test dewatering and surface water control systems minimum 7 days before starting excavation or trenching.

1.13 COORDINATION

A. Coordinate work to permit the following construction operations to be completed on dry stable substrate.

1. Excavation and Trenching for structures and utilities specified in Section

02200.

2.1 DEWATERING EQUIPMENT

A. Select dewatering equipment to meet specified performance requirements.

2.2 MONITORING EQUIPMENT

A. Piezometers: Standpipe or pneumatic type for sand filter or push in installation to monitor water elevation.

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2.3 ACCESSORIES

A. Valves and Fittings: Furnish valves and fittings to isolate each well from header pipe and to prevent loss of pump prime.

3.1 EXAMINATION

A. Conduct additional borings and investigations to supplement subsurface investigations identified in Section 02010 as required to complete dewatering system design.

B. Call Underground Service Alert not less than three working days before performing Work.

1. Request underground utilities to be located and marked within and surrounding construction areas.

A. Protect existing adjacent buildings, structures, and improvements from damage caused by dewatering operations.

3.3 MONITORING WELLS

A. Install monitoring wells at locations indicated on approved shop drawings as specified for dewatering wells.

B. Test each monitoring well point to verify installation is performing properly.

C. Install piezometers (if any), calibrate, and test for proper operation.

D. Protect monitoring well standpipes from damage by construction operations.

E. Maintain accessibility to monitoring wells continuously during construction operations.

F. Maintain monitoring wells until groundwater is allowed to return to normal level.

3.4 DEWATERING SYSTEM

A. Install dewatering system in accordance with approved Shop Drawings.

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B. Locate system components to allow continuous dewatering operations without interfering with installation of permanent Work and existing public rights-of-way, sidewalks, and adjacent buildings, structures, and improvements.

C. Drill wells in sizes and to depth indicated on approved Shop Drawings. Provide temporary surface casing when required to stabilize soil while advancing well.

D. Develop wells to remove clay, silt, and sand from well screen and immediate vicinity of bore hole.

E. Test wells for proper water flow through well screen and pumping rate for dewatering system operation. Repeat development until well meets performance requirements.

F. Cover and seal top of wells until pump is installed.

G. Install pumps in accordance with manufacturer’s instructions.

H. Connect pumps to discharge header. Install valves to permit pump isolation.

3.5 SURFACE WATER CONTROL SYSTEM

A. Provide ditches, berms, and other devices to divert and drain surface water from excavation area as specified in Section 02370.

B. Divert surface water and seepage water within excavation areas into sumps and pump water into drainage channels, storm drains, and settling basins in accordance with requirements of agencies having jurisdiction.

C. Control and remove unanticipated water seepage into excavation.

3.6 SYSTEM OPERATION AND MAINTENANCE

A. Operate dewatering system continuously until backfill is a minimum of 2 feet above ground water table elevation and backfilling is complete.

B. Provide 24-hour supervision of dewatering system by personnel skilled in operation, maintenance, and replacement of system components.

C. Conduct daily observation of dewatering system and monitoring system. Make required repairs and perform scheduled maintenance.

D. Fill fuel tanks before tanks reach 25 percent capacity.

E. Start emergency generators at least twice each week to check operating condition.

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F. When dewatering system cannot control water within excavation, notify Engineer and stop excavation work.

1. Supplement or modify dewatering system and provide other remedial measures to control water within excavation.

2. Demonstrate dewatering system operation complies with performance requirements before resuming excavation operations.

G. Modify dewatering and surface water control systems when operation causes or…