672STORMWATER TURBIDITY CONTROL

578

remove suspended materials from construction stormwater. The Contractor shall submit to the Engineer the proposed Active Treatment System for review as part of the Contractor’s Stormwater Management Plan that is described in Subarticle 108.04(b).

Flocculant shall be of the type that is manufactured for use in reducing turbidity caused by soil erosion and sediment transport. All forms of Flocculant utilized on a project shall be compatible and shall be provided from a single manufacturer. Flocculant may be in the form of blocks, powder, sock sets or other non-liquid forms. Liquid forms of Flocculant may only be utilized in a monitored active treatment system. The Contractor shall be responsible for the testing of the project soil and potential sediment and for the proper selection of those Flocculants that have a soil specific chemical makeup. Flocculant application rates shall be per the manufacturer’s recommendations. A list of acceptable Flocculants (LIST II-24 “TEMPORARY AND PERMANENT EROSION AND SEDIMENT CONTROL PRODUCTS”) is given in the ALDOT’s MSDSAR manual. For Flocculants without prior acceptance, Contractor shall submit to the Engineer three copies of documentation of the effectiveness of the Flocculant, Material Safety Data Sheets, and the manufacturer's 7-day Chronic Ceriodaphnia Reproduction Testing for review and approval by the State Construction Engineer prior to use on the project.

Turbidimeters shall be devices capable of measuring the nephelometric turbidity units (NTU) of construction stormwater that meets the following requirements:  Portable waterproof device that meets USEPA Method 180.1 with a 0-1000 NTU range;  Sample Tubes, Calibration Kit, and Protective Carrying Case;  Rechargeable Battery, USB Interface, Cable, and Computer Software. A list of equipment acceptable for use in this application (List II-24 “TEMPORARY AND PERMANENT EROSION AND SEDIMENT CONTROL PRODUCTS”) is given in the ALDOT’s MSDSAR manual. Information concerning this list is given in Subarticle 106.01(f).

672.03Construction Requirements

The Contractor shall provide an Active Treatment System at the locations given in the plans or as directed by the Engineer. Treated construction stormwater discharges that do not meet state water quality standards or that do not meet the requirements of the NPDES Construction General Permit (CGP) will not be allowed. Active Treatment Systems will typically be utilized for the dewatering of sedimentation basins. Valves located on the outlet pipe of the basin dewatering device shall remain closed until such time that the potential discharge meets state water quality standards and the requirements of the NPDES CGP. If discharge standards are not met and the sedimentation basin volume reaches 2/3 full or there is forecasted rain, the Engineer will determine if the basin should be dewatered by means of the Active Treatment System. Weather permitting, discharges may be recirculated into sedimentation basins in an effort to achieve discharge standards. The Engineer may also direct dewatering by means of the Active Treatment System to facilitate sedimentation basin maintenance. The Contractor shall ensure proper Flocculant dosing of the Active Treatment System per the manufacturer’s dosing recommendations to prevent the discharge of any harmful levels of Flocculant. The turbidity level of the Active Treatment System discharge and the effectiveness of the Flocculant shall be monitored by the Contractor and will be verified by the Engineer.

The Contractor shall apply Flocculant at the locations given in the plans or as directed by the Engineer. Flocculant shall be introduced to flowing stormwater at locations such as ditch checks, temporary slope drains and forebays of sedimentation basins, prior to retention BMPs intended to promote settling and capture of flocculated material. Heavy sediment and sand should be captured prior to the location of the Flocculant application. Flocculant shall never be applied directly to live streams or waters of the state. Flocculant shall be applied in accordance with the Flocculant manufacturer's dosing recommendations and the requirements shown on the plans for construction stormwater turbidity reduction. The effectiveness of the Flocculant will be monitored by the Engineer. ALDOT and Contractor QCIs shall inspect Flocculant applications after each rain event to determine if the reapplication of Flocculant is needed. CONSTRUCTION SAFETY FENCE 579

When construction stormwater sampling and turbidity monitoring is required per Item 107.21(e)2., the Contractor shall furnish the required quantity of Turbidimeters for use by the Engineer. The Contractor shall provide documentation of professional calibration of the device prior to delivery to the project and shall maintain annual professional calibration during the time that it is required on the project. Daily calibration and required stormwater sample testing shall be performed by the Engineer. The Contractor shall immediately replace any Turbidimeters that are in need of annual professional calibration or are otherwise not properly functioning, without additional compensation. The Contractor shall retain ownership of the device and will be notified once the Engineer determines that the device is no longer needed.

672.04Method of Measurement

Active Treatment System (Item 672-A) will be measured per each.

Active Treatment System, Operating Day (Item 672-B) will be measured per each. Operating days shall be measured individually for each Active Treatment System.

Flocculant Application (Item 672-C) will be measured per each based on the type of application (ditch check, temporary slope drain, sedimentation basin, or inlet protection).

Contractor Retained Turbidimeters (Item 672-D) will be measured per each.

672.05Basis of Payment

Payment for Active Treatment System shall be full compensation for all equipment costs for a complete system designed to dewater at the required flowrate given in gallons per minute (GPM), including but not limited to delivery, installation, maintenance, and rental fees. Payment will not be made for the replacement of an Active Treatment System that does not produce discharges meeting requirements. Payment for an Operating Day of the Active Treatment System shall be full compensation for all labor and material costs to operate one complete system at the required flowrate given in gallons per minute (GPM), for up to 10 hours, including but not limited to Flocculant, filter media, and other consumables. Payment shall only be made for operation directed by the Engineer. Payment for flocculant shall be full compensation for testing (if required), furnishing and placing the flocculant. Payment for the accepted Turbidimeter shall include furnishing of the device with all the required accessories and for any required calibrations. Payment shall be for the exclusive use of the device for the duration of the contract or until the Engineer determines that there will be no further need for the device.

672-A Active Treatment System, ____ GPM – per each 672-B Active Treatment System, ____ GPM, Operating Day – per each 672-C Flocculant Application, * – per each 672-D Contractor Retained Turbidimeter – per each * Ditch Check, Temporary Slope Drain, Sedimentation Basin, or Inlet Protection CONSTRUCTION SAFETY FENCE

674.01Description

This Section shall cover the work of furnishing, erecting, maintaining, and removing construction safety fence as shown on the plans, or directed by the Engineer, for the purpose of directing pedestrian traffic safely through construction work areas. GEOMETRIC CONTROLS 580

674.02Materials

Construction Safety Fence shall consist of a plastic, open-mesh fencing material, which shall be bright orange in color, and mounted on posts by means of adjustable belts or loops or other means that will securely hold the fencing in an upright position. Posts may be of any type material that will adequately serve the intended purpose for the duration of the project. Fence material shall weigh at least 12 pounds per 100 foot long roll (four foot wide roll) {5.4 kg per 30 meter long roll} ({1.21 meter wide roll}). The Department has established a list (List V-7) of acceptable Construction Safety Fences. The Contractor may furnish any of the safety fences shown on this list. The list is given in the Department's manual, "MATERIAL, SOURCES AND DEVICES WITH SPECIAL ACCEPTANCE REQUIREMENTS."

674.03Construction Requirements

Construction Safety Fence shall be installed as shown in the plans and as directed by the Engineer. The fence shall be continuous, four feet in height above the ground surface, and shall be spliced together only at support posts with a minimum 6 inch {150 mm} overlap. The maximum spacing between posts shall be 10 feet {3 meters}. The Contractor shall maintain the integrity of the fence as long as the engineer deems necessary and while construction or associated activities are ongoing in the vicinity of the area enclosed or delineated by the fence. The Contractor shall routinely inspect the fence and correct any deficiencies immediately. The fence shall remain in place until the Engineer directs that it be removed. The fence materials shall remain the property of the Contractor and may be reused at other locations, provided they are in satisfactory condition for reuse as determined by the Engineer. Posts and the hardware for attaching the construction safety fence to the posts shall be considered a necessary requirement of the construction safety fence installation and no direct payment will be made for such.

674.04Method of Measurement

Construction Safety Fence will be measured in linear feet {meters} to the nearest 0.1 of a foot {0.1 meter} along the line of the completed fence.

674.05Basis of Payment

The unit price for Construction Safety Fence shall be payment in full for furnishing all materials and for all labor, tools, equipment, and incidentals necessary for performing all work involved in constructing, maintaining, removing, and disposing of the construction safety fence.

674-A Construction Safety Fence - per linear foot {meter} GEOMETRIC CONTROLS

680.01Description

When this item is included in the proposal, it shall consist of the Contractor furnishing, placing, and maintaining construction stakes, lines, and grades necessary for establishing the accurate location of all features of construction.

680.02Materials

All materials needed in the performance of the work of Geometric Controls shall be furnished by the Contractor.

680.03Construction Requirements

The Engineer will furnish centerline control points (P.C.s, P.O.C.s, P.T.s, P.O.T.s, etc.) at intervals determined necessary by the Engineer for the Contractor to establish alignment on all roadways. Where ramps, cross roads, service roads, etc. are geometrically tied to the mainline roadway, the Engineer