d.Special Filter Blanket. The item of Special Filter Blanket, when provided in the contract, will be measured in square yards {square meters} to the nearest 0.1 square yard {0.1 m²}, complete in place, for the material placed and accepted.
e.Horizontal Drains. Horizontal drains will be measured by the linear foot {meter} of drainpipe installed in the holes drilled, including the extension necessary to discharge into the collector structure.
f.Special Backfill for Slide Correction.
1.When the item of Special Backfill for Slide Correction per ton {metric ton} is provided in the contract, the material ordered and accepted will be measured in tons {metric tons} on approved scales.
2.When the item of Special Backfill for Slide Correction per cubic yard in place {cubic meter} is provided in the contract, the accepted volume of backfill will be measured in cubic yards {cubic meters} complete in place by the cross section and average end area method. Cross sections shall be taken of the material in its original position, whether from a borrow pit, stockpile, or other approved source, before placing of the backfill and re-cross sectioned after placing the backfill. The volume computed between these cross sections shall be the volume of backfill.
219.05 Basis of Payment.
a.Unit Price Coverage.
1.When the item of Rock Buttress for Landslide Correction is provided in the plans or proposal, the accepted weight {mass}, measured as noted above, will be paid for at the contract unit price bid. Said contract unit price bid shall be payment in full for furnishing and/or producing material, royalties, loading, hauling, placing, consolidating, shaping, and for all equipment, tools, labor, and incidentals necessary to complete the work.
2.The accepted item of Special Underdrain, measured as noted above, will be paid for at the contract unit price bid per linear foot {meter}, which shall be full compensation for the underdrain complete in place. Said unit price includes excavation of the trench, backfill and compaction thereof, furnishing and installation of any pipe, fittings, geotextile filter, or filler necessary thereto, furnishing and placing of a connection to an outfall pipe or collector structure, the disposal of excess material, and for all tools, equipment, labor, and incidentals necessary to complete this item of work.
3.The accepted item of Special Filter Blanket, measured as noted above, will be paid for at the contract unit price bid per square yard {square meter}, which shall be full compensation for the item complete in place and includes the furnishing of all materials, preparation of the area to receive the filter blanket, installation of the blanket and for all equipment, tools, labor, and incidentals necessary to complete this item of work.
4.The accepted item of Horizontal Drain, measured as noted above, will be paid for at the contract unit price per linear foot {meter}, which shall be full compensation for furnishing and installation of the drains complete in place and connected to the collector structure. Said unit price includes full compensation for furnishing all materials, services, equipment, tools, labor, and incidentals necessary to complete this item of work.
5.The items of Special Backfill for Landslide Correction, ordered, accepted, and measured as noted above, will be paid for at the appropriate unit price bid per ton {metric ton} or cubic yard {cubic meter}, complete in place, which shall be full compensation for the furnishing of the type material designated for preparation of the area to be treated, loading, hauling, placement, compaction, and dressing of the area to the designated slope and includes all equipment, tools, labor, and incidentals necessary to complete this item of work.
b.Payment will be made under Item No.: 219-A Rock Buttress for Landslide Correction - per ton {metric ton} 219-B Special Underdrain ___ inch {mm} Diameter - per linear foot {meter} 219-C Special Filter Blanket * - per square yard {square meter} 219-D Horizontal Drain ___ inch {mm} Diameter - per linear foot {meter} 219-E Special Backfill for Landslide Correction - per ton {metric ton} 219-F Special Backfill for Landslide Correction - per cubic yard {cubic meter} * Specify either Aggregate or Geotextile. SECTION 224 TREATMENT OF LIME SINKS SECTION 224 TREATMENT OF LIME SINKS
224.01 Description.
The work under this Section shall cover the treatment required to correct conditions occurring when lime sinks are found within or adjacent to construction limits of the work. The application and extent of the treatment will be in accordance with plan details or as directed.
224.02 Materials.
Material furnished for use under this Section shall be of the quality and character noted on the plans or ordered by the Engineer, suitable for the purpose intended, and consistent with the requirements for such materials as may be noted in other parts of these Specifications.
224.03 Construction Requirements.
a.General. Choice of equipment to perform the work required under this Section shall in general be that of the Contractor provided such will produce the desired results within the limits directed by the Engineer.
b.Sequence of Work. To properly evaluate the limits of the corrective treatment required to effectively bridge a lime sink, the work shall be performed in the following sequence: Exploration of the lime sink area to locate the sink hole will be as directed by the Engineer; the size of the exploratory excavation shall be kept to a minimum. The sink hole, once located, shall be enlarged to the size and depth as directed by the Engineer to expose the solution cavity. After exposing the solution cavity, it shall be plugged with a rock boulder or a plug of suitable material capable of sealing the cavity yet maintaining proper ground water drainage. After installation of the plug, a strata of selected material that will permit proper ground water drainage shall be placed to a depth of approximately one-half the excavated hole depth, but not in excess of 7 feet {2 m}. The material used for this "Special Backfill" shall be of the type shown on the plans or directed. This special backfill material shall be placed in approximately equal uniform layers, not to exceed 2 feet {600 mm} in thickness, for the depth specified or directed. No compaction or density tests will be required. The remainder of the backfill for the lime sink excavation shall then be constructed of Unclassified Excavation, Borrow, or other designated material in accordance with the requirements for Embankments as required in Section 210. In the event a sink hole occurs in the immediate vicinity of the finished subgrade elevation, the use of concrete seal may be directed. In such case, the same process noted before shall be used up to the bottom elevation designated for the concrete seal. The concrete shall be Class A concrete of the thickness shown on the plans or as directed. Steel reinforcement, if required, will be as provided by the plans or as directed.
224.04 Method of Measurement.
a.Lime Sink Excavation. Measurement for this item will be in cubic yards {cubic meters} computed from field measurements of the material actually removed as directed.
b.Special Backfill for Lime Sink. Special backfill material, furnished as directed, will be measured in cubic yards {cubic meters}, loose measurement, or per ton {metric ton} in the transporting vehicle. The boulder or plug will be measured for payment as an estimated number of cubic yards {cubic meters} or an estimated tonnage {metric tonnage}.
c.Concrete Seal. When the use of a concrete seal is ordered, measurement will be made in cubic yards {cubic meters} computed from field measurement of concrete actually placed. All reinforcement required will be measured in accordance with Section 502, Steel Reinforcement.
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Source: 2026 Standard Specifications for Highway Construction, 2026 Edition. Pages 148–149 of 826. View official source ↗