6-48SECTIO N 614 – STREA M DIVERSIO N AND IN-WATE R SEDIMEN T ISOLATIO N MEASURES 614.0 1 DESCRIPTION . This work shall consist of implementing adequate control measures to protect the flow of water through the construction site using temporary stream relocation or in -water sediment isolation measures . This shall include designing, furnishing, installing, maintaining, and removing the control measures, as well as erosion prevention and sediment control, channel m aintenance, and debris removal in accordance with these specifications. 614.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Stone Fill ................................ ................................ ................................ .................... 706.04 Geotextile for Roadbed Separator ................................ ................................ .............. 720.02 Geotextile Under Stone Fill ................................ ................................ ....................... 720.04 Geotextile for Filter Curtain ................................ ................................ ....................... 720.06 Other materials which effectively separate sediment or pollutants from waters of the state, as defined in the Vermont Water Quality Standards , may be used. These shall be detailed on the EPSC plan and are subject to approv al. 614.0 3 TEMPORAR Y RELOCATIO N OF STREAM .
a.Submittals . Prior to beginning the work under this section , the Contractor shall submit to the Engineer site -specific plans, including all construction, erosion prevention and sediment control, and maintenan ce details, for providing temporary stream relocations at the stream crossings specified in the Plans. These details shall be developed in accordance with the requirements of Section 653 and will be considered a component of the overall project EPSC plan. All relocation plans shall be reviewed by applicable regulatory agencies and approved by the Engineer prior to beginning work. These plans shall adequately provide for the storm generated flow values listed on the Plans and shall be stamped by a professional engineer . The plans shall address erosion prevention and sediment control, channel maintenance, debris removal, and the materials and methods of creating the upstream diversion from the existing channel. These plans shall conform to any state and federal permits which have been issued for th e project, or the Contractor shall be responsible for obtaining the necessary amendments to those permits.
b.Construction Requirements . The Contractor shall maintain the relocated stream channel for the duration of its existence so as not to impact the free flow of the stream or to increase any flood levels or potential for property damage upstream or downstream of the project site. Unless otherwise approved, existing flow shall be maintained for the durati on of the relocation.
6-49 The Contractor shall be responsible for sizing their own temporary relocation components. It shall
be incumbent upon the Contractor to determine the level of protection required to protect the work. However, the protection of existing facilities, structures, and property must also be undertaken , and any damage thereto shall be repaired by the Contractor at no additional expense to the Agency . In-stream construction shall be undertaken during the period specified i n the project permits. Any changes to this period shall be approved in writing by the appropriate permitting agency. It shall be the responsibility of the Contractor to obtain any variances to the in -stream construction period. Excavation for the relocat ed stream channel shall be performed in conformance with the requirements for channel excavation specified in Subsection 203.06 . Geotextile fabrics and stone fill shall be furnished and installed in conformance with the requirements of Section 649 and Section 613 , respectively. Pipes shall be furnished and installed in conformance with Section 601 . The upstream diversion shall be done in such a manner as to minimize erosion and sedimentation. Upstream diversion shall not be done when stream conditions are s uch that the possibility of excessive erosion and sedimentation will occur. This work shall be scheduled such that it is performed during a period that no heavy rains or storm events are anticipated. The relocation shall be maintained, throughout the time it is in place, free from debris, logs, stumps, and other obstructions which might impair the free flow of water through the diversion. After completion of the new permanent channel improvements and the re -diversion of channel flow through the new permane nt channel, the entire length of the temporary channel shall be excavated to remove all muck, sediment, debris, and foreign matter. Any portion of the temporary channel which falls outside of the embankment limits shall be restored to match the existing g round . 614.0 4 IN-WATE R SEDIMEN T ISOLATIO N MEASURES .
a.Submittals . The proposed in -water sediment isolation measures shall be submitted for acceptance as part of the EPSC plan and in accordance with any permit conditions, including review by regulatory agencies, as applicable. The proposal shall include the design, and a plan for the construction, installation, and maintenance of the in -water sediment isolation measures.
6-50 (b) Construction Requirements . When used to contain sediments or pollutants from a work area that
is adjacent to or under water, the measures shall b e installed to completely enclose the portion of the work area that will be under water. The measures shall deflect and withstand existing current or wave action and be effective at the anticipated water levels. The measures shall be continuously anchored along the bottom to prevent the escape of all sediments or pollutants into the mainstream or body of water. The Contractor shall repair or replace damaged or otherwise ineffective measures as ordered by the Engineer. The Contractor shall remove material a ccumulated behind the measures as directed by the Engineer. The Contractor shall remove the measures and all supporting and anchoring material prior to acceptance of the project, unless otherwise directed by the Engineer. 614.0 5 METHO D OF MEASUREMENT . The quantity of Temporary Relocation of Stream to be measured for payment will be on a unit basis for each temporary stream location specified on the Plans . The quantity of In -Water Sediment Isolation Measures to be measured for payment at the locations specified on the Plans will be on a lump sum basis for the complete and accepted work. 614.0 6 BASIS OF PAYMENT . The accepted quantity of Temporary Relocation of Stream will be paid for at the Contract unit price for each temporary stream relocation. Payment will be full compensation for designing, constructing, maintaining, and removing each temporary stream relocation, and for furnishing all labor, tools, equipment, materials, and all incidentals necessary to complete the work. Where a te mporary relocation of stream is constructed for the convenience of the Contractor and is not specified in the Plans or ordered by the Engineer, the costs for the temporary relocation shall be considered incidental to all other Contract items. Payment for t he design and detailing of erosion prevention and sediment control measures for Temporary Relocation of Stream will be considered incidental to item 653.01 00. Payment for the monitoring and maintenance of erosion prevention and sediment control measures fo r Temporary Relocation of Stream will be considered incidental to item 653.02 00 and item 653.03 00, respectively. Payment for erosion prevention and sediment control measures and turf establishment for Temporary Relocation of Stream will be made under the a ppropriate Contract items.
6-51 Partial p ayment s for Temporary Relocation of Stream will be made as follows:
a.The first payment of 75% will be made when the construction of the temporary stream relocation has been completed and it is operational and acce pted by the Engineer.
b.The remaining 25% will be paid when the temporary stream relocation has been removed and the site restored and stabilized to the satisfaction of the Engineer. The accepted quantity of In -Water Sediment Isolation Measures will be paid for at the Contract lump sum price. Payment will be full compensation for designing, furnishing, installing, handling, maintaining, and removing the In -Water Sediment Isolation Measures and accumulated sediments, and for furnishing all labor, tools, e quipment, materials, and incidentals necessary to complete the work. Payment will be made under: Pay Item Pay Unit 614.1000 Temporary Relocation of Stream ................................ .............................. Each 614.2000 In-Water Sediment Isolation Measures ................................ ..................... Lump Sum
6-52 Sectio N 616 – Curb S and Gutters
616.0 1 DESCRIPTION . This work shall consist of the construction, resetting, or removal of curbs and gutters. 616.0 2 MATERIALS . Materials shall meet the requirements of the following subsection s: Performance -Graded Asphalt Binder ................................ ................................ ......... 702.01 Emulsified Asphalt ................................ ................................ ................................ .....702.02 Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Mortar, Type I ................................ ................................ ................................ ............ 707.01 (b) Mortar, Type IV ................................ ................................ ................................ ......... 707.0 1(e) Joint Sealer, Hot Poured ................................ ................................ ............................ 707.0 2(a) Preformed Joint Filler, Cork , and Asphalt -Treated Felt ................................ ............ 707.0 6 Preformed Joint Filler, Bituminous Type ................................ ................................ ..707.1 2(a) Bituminous Concrete Mixtures ................................ ................................ ................ 716.02 Bituminous Mixing Plant and Laboratory ................................ ................................ .716.03 Preparing and Mixing Bituminous Concrete Mixtures ................................ .............. 716.04 Timber Preservative ................................ ................................ ................................ ...726.01 Vertical Granite Curb ................................ ................................ ................................ .729.01 Granite Slope Edging ................................ ................................ ................................ .729.0 2 Precast Reinforced Concrete Curb ................................ ................................ ............. 729.0 3 Bituminous Concrete Curb ................................ ................................ ........................ 729.0 4 Treated Timber Curb ................................ ................................ ................................ ..729.0 5 All cast -in-place concrete for curbing and gutters shall conform to the r equirements of Section 541 for Concrete, Class B. There shall be a mineral admixture substitution for Portland cement of 20% fly ash or 25% ground granulated blast -furnace slag (GGBFS ). 616.0 3 GRANIT E CURBIN G AND SLOP E EDGING .
a.Excavation . Excavation shall be made to the required depth . The base material on which the curb is to be set shall be compacted to a firm, even surface . All soft and unsuitable material shall be removed and replaced with suitable material that shall be thoroughly compacted.
b.Installation . Shall be installed in conformance with the line and grade shown on the Plans . All space u nder the curbing shall be filled and thoroughly tamped with material meeting the requirements of the material for the bed course.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 822–825 of 1,380.