127 SECTION 211 BORROW EXCAVATION
211.1 -DESCRIPTION : This work shall consist of furnishing, excavating, transporting, placing, compacting, and furnishing material required to complete the roadway and embankments;
211.2 -MATERIALS : 211.2.1 -Unclassified Borrow Excavation: Materials shall be obtained which are suitable for the particular purpose for which unclassified borrow excavation is authorized.
211.2.2 -Rock Borrow Excavation: Material shall meet the requirements specified for Rock in 207.7.3.2.3.
211.2.3 -Selec t Borrow Excavation: Material shall consist of a granular material as defined in 716.1.1.2 unless otherwise specified in the Contract.
211.2.4 -Impervious Core: Materials shall meet the requirements specified in Section 211.3.3.
CONSTRUCTION METHODS
211.3 -GENERAL : The Contractor shall locate and furnish all borrow sites to obtain materials in the amounts directed, by the methods and subject to the same provisions as prescribed in 207 except as modified or amended within. Borrow excavation should not be obtained or placed until after all available roadway excavation has been utilized in the embankments and there is no likelihood of slip or excess material. The Contractor will have the option to borrow with in the WVDOH right -of-way limits (R/W) or on private property located outside the R/W. If the Contractor chooses to borrow within the R/W, the following procedure must be adhered to before any borrow will be allowed:
211.3.1 -Borrow within WVDOH R/W Lim its: The Contractor shall submit copies of a site plan for any borrow within the R/W and each page/sheet of all submittals shall be signed by a professional Engineer Registered in the State of West Virginia. The submittals and the approving Engineers’ si gnature block shall be as per Section 105.2.1.2 for shop drawing submittals. The plan for the site shall include, but not be limited to:
landowner property information;
etc.;
consistent with all phases of operation of the borrow site;
permit, the Contractor shall provide the necessary revised permit drawings to show the proposed changes to the DOH in order to modify the existing 404 permit and to obtain
128 a 401 Water Quality Certification if necessary. A minimum of 2 months may be required to get approval.
Steepening of slopes will not be allowed for borrow si tes within the R/W without a geotechnical analysis. Upon receipt of the Contractor’s complete borrow site submission, the Engineer shall follow the guidelines as set forth in the latest edition of the WVDEP Erosion and Sediment Control Best Management Practices Manual for review and acceptance by the Division. The Contractor may be required to revise the site plan prior to acceptance by the Division. The Contractor’s borrow site plan must be approved as per section 105.2.1.2 and the West Virg inia Department of Environmental Protection before any borrow material may be obtained from the site. The DOH will bear the cost of all features associated with the borrow site except for necessary revisions to drainage structures (i.e. lengthening of cu lverts, etc.). Upon completion of work, all borrow sites shall be neatly trimmed and drained and all debris and spoil disposed of in accordance with the approved plan. No material shall be borrowed from places other than those approved, except as provide d. Slopes shall be trimmed neatly to present a uniform surface, free from hollows or protrusions and loose or overhanging rocks. The Contractor shall take precautions by benching or other methods to prevent slides and slip outs. Borrow areas shall be gr aded by the Contractor then fertilized, seeded and mulched in accordance with the applicable Specifications and will be paid for in accordance with the pay items within the contract. The Contractor shall minimize pollution or sedimentation of rivers, str eams, lakes, ponds, and other bodies of water while conducting borrow operations.
211.3.2 -Borrow outside of WVDOH R/W Limits: For borrow sites outside the R/W, the Contractor and/or property owner shall bear all costs and responsibilities associated w ith the site. Appropriate Traffic Control items within the Project Limits will be paid accordingly. The Contractor and/or property owner shall comply with existing laws and/or regulations to include approval from the State Historic Preservation Officer a nd save the State harmless from any claims for damages which may result from the borrow. The Contractor shall minimize pollution or sedimentation of rivers, streams, lakes, ponds, and other bodies of water while conducting borrow operations. Borrow pi ts shall not be excavated below the level of the natural drainage for the area, and the drainage ditches required to keep the pit free from standing water during the progress of the work and upon completion and shall be constructed without extra compensati on.
211.3.3 -Impervious Core: An impervious core shall be constructed for all sediment basins built of rock, gravel, and pervious soils. When a key is necessary for the sediment basin, the impervious core shall be made an integral part of the key. When the impervious core is not constructed of soil, the core shall be anchored into the key by trenching for a minimum depth of two ( 2) feet. The impervious core may be constructed using one of the following methods:
and compaction. The coefficient of permeability of the soil used for the impervious core must be 10-4 cm per sec or less. A key, a minimum of four ( 4) feet in depth, must be constructed into the original gro und. The compaction of the impervious core shall be as in accordance with Section 716.3.
129 b) Concrete Impervious Core: When concrete is used for the impervious core, Class B Concrete shall be used. The requirements of Section 601, Structural Concrete shall control the mixture and placement of the concrete. The Engineer may waive the testing of the Class B Concrete if the concrete is from an approved plant.
High Density Polyethylene (HDPE) or Low Linear Density Polyethylene (LLDPE), the liner shall be manufactured to be suitable for buried conditions and may be either smooth or textured. The Contractor shall obtain recommendations from a liner manufacturer for the mater ial best suited for impervious cores, handling, storage, and construction procedures. The manufacturer of the liner shall furnish the Engineer a Letter of Certification stating the liner is suitable for the intended use.
methods of preventing the seepage of water from the wet area. The Engineer must approve the design of the alternative method.
The bottom width of the impervious core should, at a minimum, equal the total embankment height. The maximum size of the impervious core is a function of the embankment’s upstream and downstream external slopes. When the impervious core is not constructed using the Soil Impervious Core method the Contractor shall submit a p lan containing construction details and materials to be used for the impervious core(s) for the approval of the Engineer prior to the start of work and the purchase of any materials; Other Methods (bullet d) for Impervious Core shall also be signed and sea led by a WV Registered Professional Engineer. This submittal will be part of the temporary and permanent pollution control schedules and methods required by Section 642.3.
211.4 -UNCLASSIFIED BORROW EXCAVATION : Unclassified borrow excavation shall consist of material, as prescribed, incorporated into embankments, backfill, shoulders, or any other type of work shown on the Plans or designated by the Engineer. The method of placement, compactio n and density shall be in accordance with the applicable requirements of Subsection 207.7.
211.5 -ROCK BORROW EXCAVATION : Rock borrow excavation shall consist of materials, as prescribed, incorporated into embankments in accordance with the provisions of 207.7 covering the construction of rock fills. Stones used for scour protection shall be in accordance with section 218.4.1.
211.6 -SELECT BORROW EXCAVATION : Select borrow excavation shall consist of material as prescribed, incorporated into embankments, backfills, shoulders, or any other type of work shown on the Plans or designated by the Engineer. The method of placement, compaction and dens ity shall be in accordance with the applicable requirements for granular material as prescribed under 207.7.
211.7 -METHOD OF MEASUREMENT : 211.7.1 -Cubic Yard Measurement: The quantity of work done will be measured in cubic yards actually obtained and incorporated in the work, determined in its original position from cross sections by the average end areas. The method of measurement may also be calculated as 80 percent (80%) of the truck load volume of each truck used to haul the material. The measurement of the load will be taken
130 inside each bed and will include length, width and average height to the top of the load. However, the measurement will exclude the hoist housing . When Rock Borrow is obtained from a commercial source payment may be per cubic yard by converting 1.65 tons to equal 1 cubic yard. If the borrow is obtained in such quantity or in such manner that a waste of unclassified excavation, slips, or excess m aterial is caused, the amounts of such waste shall be deducted from the borrow volume. In determining the amount of material to be developed due to unauthorized placement of borrow material or unclassified excavation material in the embankments, the quant ity outside the construction tolerance will be measured and deducted from borrow on a yard -to-yard basis without adjustment due to shrinkage or swelling.
211.7.2 -Ton Measurement: The quantity of work done will be measured in tons actually obtained and incorporated in the work, determined by the total of the weights shown on receipted railroad freight bills when materials are shipped by rail, by actual measured displacement of barges certified by the Producer when water shipments are made, providing mate rials delivered by the aforementioned methods are not stockpiled or stared; or determined by the Contractor from the total of weigh slips for each vehicle load weighed on an approved truck scale, and certified by the Contractor to be correct. The Produce r or Contractor shall provide truck scales. The scales shall be of sufficient size and capacity to weigh the heaviest loaded trucks that are used for delivery of the material. All truck scales shall be mounted on solid foundations, which will insure the ir retaining plumb and level. All truck scales shall be inspected and sealed by the West Virginia Department of Labor, Bureau of Weights and Measures, or other appropriate agencies of the State or its political subdivisions. The Department may, at its op tion, accept inspection and sealing by out of state agencies when the material is weighed outside West Virginia. A digital recorder shall be required on all truck scales. The digital recorder shall produce a printed record of the gross, tare and net wei ghts, and the time, date, truck identification and project number. Provision shall be made for constant zero compensation and further provision shall be made so the scales may not be manually manipulated during the printing process. The system shall be i nterlocked so as to allow printing only when the scale has come to rest. In case of a breakdown of the automatic equipment, the Engineer may permit manual operation for a reasonable time, normally not to exceed 48 hours, while the equipment is being repai red. A weighman shall be provided by the Producer/Supplier. The weighman shall certify that the weight of the material, as determined either by the scales or from the digital printout of the weights, is correct. Each truck shall be weighed empty prio r to each load.
211.7.3 -Square Foot Measurement: The measurement of the Impervious Core will be by the square foot of core placed and accepted by the Engineer. The area of measurement shall be calculated from the surface of a vertical plane through the centerline of the impervious core.
211.8 -BASIS OF PAYMENT : The quantities, determined as provided above, will be paid for at the contract unit price bid for these items, which unit prices and payments sha ll be full compensation for doing all the work prescribed in a workmanlike and acceptable manner, including all labor, tools, equipment, supplies, and incidentals necessary to complete the work. There will be no additional compensation for furnishing, gra ding, fertilizing, seeding and mulching of borrow pits.
131 211.9 -PAY ITEMS : ITEM DESCRIPTION UNIT 211001 -* Unclassified Borrow Excavation Cubic Yard 211002 -* Rock Borrow Excavation Cubic Yard 211003 -* Select Borrow Excavation Cubic Yard 211007 -* Unclassified Borrow Excavation Ton 211008 -* Rock Borrow Excavation Ton 211009 -* Select Borrow Excavation Ton 211017 -* Impervious Core Square Foot
* Sequence number