2026-MPW-162-DIV_31.pdf

SECTION 310000

EARTHWORK

PIERCE COUNTY

ANNEX EVSE SERVICE 310000 - 1 CD SET

PART 1 GENERAL

1.01 DESCRIPTION OF WORK

A. Work includes site earthwork including excavation, subgrade verification, backfill and fill, compaction, grading, wet weather provisions, disposal of excess and waste materials, field quality control, and protection.

1.02 RELATED DOCUMENTS

A. Drawings and General Provisions of the Contract, including Division 01 Specification Sections, apply to this section.

B. The following Section(s) relate to this section:

1. Section 31 2333 – TRENCHING AND BACKFILLING

2. Section 31 2500 – EROSION AND SEDIMENT CONTROLS

3. Section 32 1123 – AGGREGATE BASE COURSES

1.03 STANDARD SPECIFICATIONS

A. All work to be performed and materials to be used shall be in accordance with the current Standard Specifications for Road, Bridge, and Municipal Construction and the current Standard Plans, as published by the Washington State Department of Transportation (WSDOT), unless otherwise indicated herein.

B. Contractor shall have one (1) copy of the current WSDOT Standard Specifications and all amendments therein, and applicable WSDOT Standard Plans at job site.

C. Standard Specifications apply only to performance and materials and how they are to be incorporated into the work. Legal/contractual relationship sections and the measurement and payment sections do not apply to this document.

1.04 DEFINITIONS

A. Excavation: Removal of material encountered above subgrade elevations and to lines and dimensions indicated.

B. Fill: Soil materials used to raise existing grades.

C. Subgrade: Uppermost surface of an excavation or the top surface of a fill or backfill.

1.05 SUBMITTALS

A. Material Test Reports as follows:

1. Classification according to ASTM D 2487.

2. Laboratory compaction curve according to ASTM D 1557.

PART 2 PRODUCTS

2.01 TOPSOIL

A. Topsoil shall meet the requirements of WSDOT Section 9-14.2(2) Topsoil Type B. Suitable materials shall be on-site or imported material free of trash and debris.

ANNEX EVSE SERVICE 310000 - 2 CD SET

PART 3 EXECUTION

3.01 EXCAVATION

A. Unauthorized excavation consists of removal of materials beyond indicated subgrade elevations or dimensions, without specific direction of the Owner. Unauthorized excavation, as well as remedial work directed by the Owner, shall be at no change in contract amount.

1. Backfill and compact unauthorized excavations within lawn/landscape areas with nonstructural fill as specified herein.

B. Stability of Excavations: Slope the sides of excavations to comply with local codes and ordinances having jurisdiction. Shore and brace where sloping is not possible because of space restrictions or stability of material excavated. Maintain sides and slopes of excavations in a safe condition until completion of backfilling.

C. Dewatering: Prevent surface water and subsurface or ground water from flowing into excavations and from flooding project site and surrounding area:

1. Do not allow water to accumulate in excavations. Remove water to prevent softening of foundation bottoms, undercutting footings, and soil changes, detrimental to stability of subgrades and foundations. Provide and maintain pumps, well points, sumps, suction and discharge lines, and other dewatering system components necessary to convey water away from excavations.

D. Material and Storage: Stockpile excavated materials as required. Place, grade, shape, and cover stockpiles for proper drainage, and to prevent accumulation of excess moisture:

1. Locate and retain soil materials away from edge of excavations.

2. Dispose of excess soil material legally off-site.

E. Cold Weather Protection: Protect excavation bottoms against freezing when atmospheric temperature is less than 35 degrees F.

3.02 BACKFILL AND FILL

A. Backfill excavations as promptly as work permits, but not until completion of the following:

1. Inspection, testing, approval and recording locations of underground piping and conduits.

Coordinate locations with surveyor for as-built survey.

2. Removal of concrete formwork.

3. Removal of shoring and bracing and backfilling of voids with satisfactory materials.

4. Removal of trash and debris.

B. Ground Surface Preparation:

1. Remove vegetation, debris, unsatisfactory soil materials, obstructions, and deleterious materials from ground surface prior to placement of fills.

2. When existing ground surface has a density less than that specified under "Compaction" for the particular area classification, break up the ground surface, pulverize, moisture-condition to within 2 percent of the optimum moisture content, and compact to required depth and percentage of maximum density.

C. Placement and Compaction: Allowable thickness of fill lifts will depend on the material type and compaction equipment used. In no case place backfill and fill materials in layers more than 8-inches in loose depth for material compacted by heavy compaction equipment, and more than 4-inches in loose depth for material compacted by hand-operated tampers. For fill deeper than 3-feet below the base of pavements, lifts may be 12-inches maximum in loose depth:

1. Before compaction, moisten or aerate each layer as necessary to provide the optimum moisture content.

2. Compact each layer to the required percentage of maximum dry density or relative dry density for each area classification.

3. Do not place backfill or fill material on surfaces muddy, frozen, or containing frost or ice.

ANNEX EVSE SERVICE 310000 - 3 CD SET

3.03 COMPACTION

A. Percentage of Maximum Density Requirements: Compact soil to not less than the following percentages of maximum dry density determine, in accordance with ASTM D 1557 ("Modified Proctor”):

1. Building Foundations: Compact top 12-inches of subgrade where exposed, and each layer of backfill or fill material to 95 percent of maximum dry density. Shall be placed and compacted per WSDOT Standard Specification Section 2-03.3(14)C Method C.

2. Lawn or Unpaved Areas: Compact top 12-inches of subgrade and each layer of backfill or fill material to 85 percent of maximum dry density.

B. Moisture Control: Where subgrade or layer of soil material must be moisture conditioned before compaction, uniformly apply water to surface of subgrade, or layer of soil material. Prevent free water from appearing on surface during or subsequent to compaction operations:

1. Remove and replace, or scarify and air dry, soil material too wet to permit compaction to specified density.

2. Soil material removed because it is too wet to permit compaction may be stockpiled or spread and allowed to dry. Assist drying by disking, harrowing, or pulverizing, until moisture content is reduced to a satisfactory value.

3.04 GRADING

A. General: Uniformly grade areas of work including adjacent transition areas. Smooth finished surface within specified tolerances, compact with uniform levels or slopes between points where elevations are shown, or between such points and existing grades.

B. Compacted as specified, and to the required elevation. Provide final grades within a tolerance of 1/2-inch when tested with a 10-foot straightedge.

C. Compaction: After grading, compact surfaces to the depth and percentage of maximum density for each area classification.

3.05 LANDSCAPE RESTORATION

A. Contractor to restore all lawn and landscaping in the project area to its pre-construction appearance.

1. Disturbed or damaged lawn and landscape areas shall be top dressed with a minimum 2” of topsoil. Lawn areas to be replaced with sod if damaged.

3.06 WET WEATHER PROVISIONS

A. Schedule earthwork operations to minimize the potential for erosion, siltation, and disturbance of site soils.

B. Perform earthwork operations in discrete areas as required, to minimize the exposure of disturbed soils to wet weather.

C. Compact exposed soil to reduce the infiltration of rainwater.

D. Direct surface water away from fills and excavations.

E. Provide temporary pumping equipment to keep excavations and construction free of water.

F. Soils which become too wet for compaction shall be removed and replaced with compacted structural fill at the contractor’s expense.

3.07 DISPOSAL OF EXCESS AND WASTE MATERIALS

ANNEX EVSE SERVICE 310000 - 4 CD SET

A. Remove any unused excess excavated material from the site and dispose of legally off the Owner’s property prior to substantial completion.

B. Remove waste materials, including unacceptable excavated material, trash, and debris, and dispose of legally off the Owner's property prior to substantial completion.

3.08 FIELD QUALITY CONTROL

A. If subgrades or fills which have been placed are below specified density, provide corrective work as specified at no additional expense.

3.09 PROTECTION

A. Protect newly graded areas from traffic and erosion. Keep free of trash and debris.

B. Repair and reestablish grades in settled, eroded, and rutted areas to specified tolerances.

C. Reconditioning Compacted Areas: Where completed compacted areas are disturbed by subsequent construction operations or adverse weather, scarify surface, reshape, compact to required density and provide other corrective work as specified, with retesting, prior to further construction.

END OF SECTION 310000

SECTION 312333

TRENCHING AND BACKFILLING

ANNEX EVSE SERVICE 312333 - 1 CD SET

A. Work includes pipe trenching and backfilling for electrical conduits.

1.02 RELATED DOCUMENTS

A. Drawings and General Provisions of the Contract, including General and Supplemental Conditions and Division 01 Specification Sections, apply to this section.

B. The following Section(s) relate to this section:

1. Section 033000 CAST-IN-PLACE CONCRETE

2. Section 310000 EARTHWORK

3. Section 312500 EROSION AND SEDIMENT CONTROLS

1.03 STANDARD SPECIFICATIONS

A. All work to be performed and materials to be used shall be in accordance with the current Standard Specifications for Road, Bridge, and Municipal Construction and the current Standard Plans, as published by the Washington State Department of Transportation (WSDOT), unless otherwise indicated herein.

B. Contractor shall have one (1) copy of the current WSDOT Standard Specifications and all amendments therein, and applicable WSDOT Standard Plans at job site.

C. Standard Specifications apply only to performance and material and how they are to be incorporated into the work. Legal/contractual relationship sections and the measurement and payment sections do not apply to this document.

1.04 SUBMITTALS

A. Material Test Reports: The Contractor shall submit a gradation summary for each proposed aggregate product to the Engineer at least one (1) week prior to anticipated use. Gradation shall be tested according to ASTM D6913 Standard Test Methods for Particle-Size Distribution of Soils using Sieve Analysis.

PART 2 PRODUCTS

2.01 BANK RUN GRAVEL FOR TRENCH BACKFILL

A. Bank run gravel for trench backfill shall conform to WSDOT Section 9-03.19 Bank Run Gravel For Trench Backfill. Suitable material shall be imported well-graded granular material free of organics and debris. Material shall be capable of being compacted as specified under the weather conditions prevailing at the time of construction.

2.02 NATIVE TRENCH BACKFILL

A. Native material for trench backfill shall conform to WSDOT Section 9-03.15 Native Material For Trench Backfill. Suitable material shall be on-site or imported material free of organics and debris.

Material shall be capable of being compacted as specified under the weather conditions prevailing at the time of construction.

2.03 TOPSOIL

SECTION 312333

TRENCHING AND BACKFILLING

ANNEX EVSE SERVICE 312333 - 2 CD SET

A. Topsoil shall meet the requirements of WSDOT Standard Specification 9-14.2(2)B. Suitable materials shall be on-site or imported material free of trash and debris.

PART 3 EXECUTION

3.01 GENERAL BANK RUN GRAVEL FOR TRENCH BACKFILL

A. Placement and compaction of bank run gravel for trench backfill shall meet the requirements of the following WSDOT Sections:

1. 7-09.1(1)E Trench Backfill

2. 7-09.3(10) Backfilling Trenches

3. 7-09.3(11) Compaction of Backfill

3.02 NATIVE TRENCH BACKFILL

A. Native trench backfill is only acceptable outside of pavement limits.

B. Placement and compaction of native material for trench backfill shall meet the requirements of the following WSDOT Section(s):

1. 7-09.1(1)E Trench Backfill

2. 7-09.3(10) Backfilling Trenches

3. 7-09.3(11) Compaction of Backfill

3.03 UTILITY TRENCHING

A. Excavation and preparation of trench for pipe installation shall meet the requirements of WSDOT Section(s):

1. 7-09.3(7) Trench Excavation

B. See Section 033000 CAST-IN-PLACE CONCRETE for Control Density Fill (CDF) backfill and pipe zone requirements.

END OF SECTION 312333

SECTION 312500

EROSION AND SEDIMENT CONTROLS

ANNEX EVSE SERVICE 312500 - 1 CD SET

A. This work includes furnishing and delivery of required erosion control materials and installation and maintenance of erosion control measures.

1.02 RELATED DOCUMENTS

A. Drawings and General Provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this section.

B. The following Section(s) relate to this section:

1. Section 024100 DEMOLITION

2. Section 310000 EARTHWORK

3. Section 312333 TRENCHING AND BACKFILLING

1.03 STANDARD SPECIFICATIONS

A. All work to be performed and materials to be used shall be in accordance with the current edition of the Standard Specifications for Road, Bridge, and Municipal Construction and the current Standard Plans, as published by the Washington State Department of Transportation (WSDOT), and the current Stormwater Management Manual for Eastern Washington as published by the Washington State Department of Ecology, unless otherwise indicated herein.

B. Contractor shall have one (1) copy of the current edition of the WSDOT Standard Specifications and all amendments therein, and applicable WSDOT Standard Plans and the Stormwater Management Manual for Western Washington at the job site.

C. Standard Specifications apply only to performance and materials and how they are to be incorporated into the work. Legal/contractual relationship sections and the measurement and payment sections do not apply to this document. The Stormwater Management Manual for Eastern Washington applies to performance and materials.

PART 2 PRODUCTS

2.01 STORM DRAIN INLET PROTECTION

A. Storm drain inlet protection shall meet requirements of WSDOT standard specification 8-01.3(9)D Inlet Protection.

2.02 STRAW WATTLES

A. Straw wattles shall meet requirements of WSDOT standard specification 8-01.3(10) Wattles.

PART 3 EXECUTION

3.01 PERFORMANCE REQUIREMENTS

A. Install erosion control measures prior to significant on-site construction.

B. Protect storm drain inlets so turbid water does not enter the storm drainage system or exceed thresholds in the adopted drainage manual.

C. No sediment shall be tracked into roadway and parking lots. Make provisions to prevent the transport of sediment onto adjacent paved roads. If sediment is tracked onto paved surfaces, SECTION 312500

EROSION AND SEDIMENT CONTROLS

ANNEX EVSE SERVICE 312500 - 2 CD SET

the Contractor shall immediately implement street sweeping that is capable of removing sediment from the pavement.

D. Operate and maintain erosion control facilities throughout the duration of construction. Provide flow and water quality monitoring results as required by permit agencies.

E. At the completion of construction, remove all temporary erosion control facilities.

END OF SECTION 312500