Revised Earthwork Spec_15 May.pdf

SECTION 31 00 00

EARTHWORK

08/08

PART 1 GENERAL

1.1 SCOPE OF WORK

The work covered by this section consists of furnishing all submittals, labor, equipment, materials, incidentals, and all efforts necessary to perform general earthwork as defined for this project. All work under this contract shall comply with the requirements of EM 385-1-1

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D2487(2017; E 2020) Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1(2014) Safety -- Safety and Health Requirements Manual

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01330 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Excavation Plan; G, DO

PART 2 PRODUCTS

PART 3 EXECUTION

3.1 PREPARATION

Thirty (30) days prior to commencement of any type of construction activities, the contractor shall submit for approval a Plan of Operation for accomplishing all site access, excavation, stone placement, and the location and construction of haul roads to placement location. This plan shall include but not be limited to the Contractor's proposed sequence of construction for excavations, and methods and types of equipment to be utilized for all excavation and rock placement including transporting and placing material, and for final deposition of excavated bank material and material used for haul roads.

3.2 GENERAL EXCAVATION

Perform excavation of every type of material encountered within the limits of the project to the lines, grades, and elevations indicated and as specified. Disposal of excavated soil shall be in locations designated in the drawings, in areas specifed in these specifications, or may be used for construction of temporary haul roads meeting the requirements in specification 01 50 00. Non-organic solid waste encountered during the excavation shall be disposed of in accordance with Section 01 57 19

TEMPORARY ENVIRONMENTAL CONTROLS.

Submit a detailed excavation plan 30 days prior to the beginning of excavation. The plan shall discuss the method(s) of excavation. A shoring, sheeting, bracing, benching, and sloping plan shall be prepared and certified by licensed professional engineer and included as part of the excavation plan for excavations that require entrance by personnel. The plan shall include drawings and design computations of the proposed shoring, sheeting, bracing, benching, and sloping. Documentation, showing details of the coordination and approval of shoring, sheeting, bracing, benching, and sloping by the applicable parties shall be included in the plan.

Approval of the excavation plan shall be obtained from the Contracting Officer prior to starting excavation. The plan shall address expected fluctuations in water levels and specifically state what range in water levels the plan applies to. If necessary, the plan shall be modified as required to meet field conditions, and the modifications shall be approved prior to use.

3.2.1 SLOPES AND SURCHARGES

Temporary excavation slopes for any structure excavation or other required excavation shall meet OSHA and EM 385-1-1 requirements, not be steeper than the specified finished slope or the specified construction slope, as applicable, and subject to the approval of the Contracting Officer. This may be accomplished by benching the temporary slope so that the average slope is not steeper than the specified slope. In addition, if spoiled material is to be spread on top of the bank paving or along the top of the bank, the bank slope after completion must match the relevant design drawings for the project.

The toe of stockpiled material shall be maintained a minimum distance back from the top of the finished excavation equal to the depth of the excavation. Determine the maximum height of such stockpile without causing instability of the excavation slope. Any slide or other adverse conditions caused by failure of the Contractor to maintain these conditions shall be considered the responsibility of the Contractor and remedial measures shall be at the Contractor's expense.

3.2.3 FINISHING

All placed stone shall be finished to the lines and grades as specified. Final lines and grades of any placed stone that will have spoil placed over the top of it shall be inspected and approved by the contracting officer prior to any placement of spoil over the finished surface. Spoil placement may have a rough appearance and should roughly match the slope or surface it is placed on, but wide variation is allowed.

3.3 HAUL ROADS

Haul roads shall be constructed to maintain the intended traffic, be free draining, and be maintained in good condition throughout the Contract Period. Areas on each side of the haul road corridor or disposal route shall not be disturbed. Haul roads or disposal routes on the top of the bank constructed during the Contract Period shall be removed following construction and restored the lines and grades to the preconstruction conditions. Dust control shall be provided as needed to ensure safe operation at all times. Haul roads shall be maintained during construction to preconstruction natural grade or higher if drainage between the haul road and the levee is not adversely impacted. If rock aggregate is used for construction of haul roads a geotextile or graded subbase layer shall be used at the base of the aggregate to prevent pumping of foundation soils into the aggregate surfacing. Development of ruts and depressions shall be closely monitored and hauling halted until ruts are filled and compacted. Rutting below initial ground surface shall be filled with material consisting of clay or silt. Blading to fill ruts will not be allowed. After construction, haul road shall be returned to pre-construction condition.

Contracting Officer will provide disposal location for excess material if appropriate. Contractor shall stay on the landside of the haul road limits when in proximity to the levee. Material shall be placed on the haul road where the haul road crosses the levee as shown on the drawings.