619Headgates and Flapgates for Irrigation Ditches

619.1 Description

This Work consists of providin g, installing, and repairing head gates, flapgates, and appurtenances, and, if specified, c onstructing irri gation ditch es.

619.2 Materials

The Contractor shall provide headgates, flapgates, and appurte nances in accordance with the Contract. The Contractor shall provide reinforcement for concrete headwalls in accordance with Section 540, “Steel Reinforcement,” and concret e in accordance with Section 510, “Portland Cement Concrete,” and Section 511, “Concrete Str uctures.”

619.3 Construction Requirements

The Contractor shall construct irrigation ditches in accordanc e with Section 203, “Excavation, Borrow, and Embankment.” The Contractor shall install headgates and flapgates in accord ance with the Plans. The Contractor shall compact backfill in contact with the Stru cture to prevent leakage of water and erosion.

619.3.1 Protective Coating

The Contractor shall provide headgates and flapgates with a pr otective coating in accordance with the manufacturer’s recommendations. If headgat es and flapgates are uncoated, the Contractor shall coat non-contact surfaces in acc ordance with Section 545, “Protective Coating of Miscellaneous Structural Steel.”

619.4 METHOD OF MEASUREMENT—Reserved

619.5 Basis of Payment

Pay Item Pay Unit Headgate Type___, ___ inch Each Flapgate ___ inch Each

619.5.1 Work Included in Payment

The following Work and items will be considered as included in the payment for the main item(s) and will not be measured or paid for separately: 1. Protective coating of headgates and flapgates, 2. Concrete, and 3. Steel reinforcement. Section 620: Selective/Non-Selective Herbicide Application Page 687 SECTION 620: SELECTIVE/NON-SELECTIVE HERBICIDE APPLICATION

620.1 Description

This Work consists of provi ding and applying herbicide. The Contractor shall store, handle, mix, and apply all herbici de in accordance with the manufacturer’s label, EPA, NMDA rules and regulations.

620.2 Materials

The Contractor shall provide herbicide in accordance with the Contract.

620.3 Construction Requirements

620.3.1 Handling, Mixing, and Loading Herbicides

The Contractor shall keep livestock, pets, and persons away fr om mixing and loading areas. When mixing herbicide, the Contractor shall provide a w ell-ventilated mixing area away from perennial or ephemeral water ways to avoid contamination. The Contractor shall follow the instructions and warnings on the manufacturer’s labels duri ng mixing, loading, and application of herbicides, to pro tect against spills, splash, a nd wind-drift. The Contractor shall wear Personal Protective Equipm ent in accordance with the manuf acturer's label.

620.3.2 Storage of Herbicides

The Contractor shall store herbicides in accordance with the a pplicable manufacturer’s label and other rules and regulations.

620.3.3 Labeling Information

The Department will designate chemicals proposed for treatment . The Contractor shall provide the following information to the Department 14 Days bef ore using the chemicals: 1. Appropriate specimen labels; 2. MSDSs; 3. Technical bulletins; 4. Toxicity ratings; and 5. EPA registration numbers.

620.3.4 Laws and Regulations

The Contractor shall strictly adhere to laws regulating the st orage, handling, mixing, loading, transporting, spill and accident reporting, and use of herbicides.

620.3.4 1 Minor Spills

The Contractor shall isolate the spill area and keep unauthori zed personnel away. The Contractor shall use soil, sawdust, or other absorbent Material to soak up the spill. The Contractor shall place contaminat ed Material into a leak-proof container and dispose of in accordance with applicable laws and regulations.

620.3.4 2 Major Spills

Section 620: Selective/Non-Selective Herbicide Application Page 688 The Contractor shall keep unauthorized personnel away, confine the area, and administer first aid if needed. The Contractor shall notify th e Chemical Transportation Emergency Center (Chemtrec), the local fire department and poli ce, and State herbicide authorities for assistance. If a major spill occurs on a State Highway, County Road, or City Street, the Contractor is responsible for notifying the affecte d State and local agencies. If food or water is contaminated, the Contractor shall notify State or federal food and drug authorities and regional, State, and federal air quality or water pollution authorities.

620.3.5 Certification of Applicators

The Department will only allow the Contractor to apply herbici des under the direct supervision of an appropriately licensed and certified applicat or. The Department requires the Contractor or its Subcontractor to be licensed in New Mexico as a commercial applicator in accordance with NMDA requirements, and certified in appropriate applications. The Department will verify proper training and testing for competen cy in the safe and effective handling and use of herbicides. The Contractor shall provide p roof of license through the NMDA to the Project Manager 14 Days before the application of t he herbicide.

620.3.6 Safety Guidelines

The Contractor shall adhere to the safety guidelines on the Ma nufacturer’s label regarding the following: 1. Potential hazards to humans, domestic animals, and the envir onment; 2. Physical and chemical hazards such as fire, explosion, or ch emical reactions to other products; and 3. Herbicide use, misuse , storage, and disposal. The Contractor shall not apply herbicide on frozen ground. Th e Contractor shall not spray along and across irrigatio n ditches where damage to priva te property could occur. If within the limits of a Town or City, the Contractor shall spray in accordance with local ordinances. The Contractor shall not spray if the wind speed e xceeds ten (10) mph, unless stated otherwise on the chemical label. The Contractor shall apply herbicide to both sides of the Road way to control noxious weeds, as directed by the Depar tment. The Department will spec ify the spray width and exact beginning and ending points at the time of application. The Department reserves the right to reject Equipment on the b asis of suitability and safety to the environment, the traveling public, the Contractor ’s employees, and Department employees. The Contractor shall provide Equipment in accordanc e with OSHA, the U.S. Department of Transportation, and the NMDA. The Contractor shall ensure that each spray truck is properly licensed and carries the appropriate plaques as required by State law.

620.3.7 Records and Documentation

The Contractor shall supply a current copy of the license and applicator’s certification to the Project Manager for verificat ion by the Department's Roadsi de Vegetation Management Unit. The Contractor shall keep a daily record of the herbicid e application showing the following information: 1. Date of application; 2. Types and application rates of herbicides applied; Section 620: Selective/Non-Selective Herbicide Application Page 689 3. Time of Day of application; 4. Air temperature; 5. Wind velocity; 6. Area covered; 7. Location of areas treated; and 8. Equipment calibration information. The Department will verify the Contractor’s daily record. The Contractor shall submit copies of the records to the Project Manager within 14 Days of the spraying.

620.3.8 Equipment

620.3.8 1 Equipment Calibration The Contractor shall calibrate the Equipment to apply the prop er amount of liquid per unit

area in accordance with the chemical manufacturer’s label befor e introducing chemicals into the Equipment. The Contractor shall recalibrate the Equipment in accordance with manufacturers recommendations and as required by the Project Ma nager.

620.3.8 2 Hand-Held Spray Applicators

The Department will a llow the Contractor t o use backpack or ha nd-held power Equipment in inaccessible areas, including cracks in Medians or islands, around guardrail posts, and signposts. The Contractor shall use hand-held applicators as d irected by the Project Manager.

620.3.8 3 Broadcast Sprayers

The Contractor shall apply herbicides with Equipment that has a spray bar with sufficient width and number of nozzles to pr ovide uniform application rate s in accordance with the manufacturer’s label. The Contractor shall ensure the spray ba r is adjustable to varying widths and heights to properly dis tribute the herbicide, to min imize drift, and to apply herbicides to specified areas only.

620.3.8 4 Boomless Sprayers

The Contractor shall not use boomless spraying Equipment for h erbicide application, unless otherwise specified in the Contract or directed by the P roject Manager. If specified or directed, the Contractor shall ensure that boom sprayers are ca pable of applying the herbicide to widths in accordance with the Plans and at rates in accordan ce with the manufacturer’s label. The Contractor shall use a drift control agent with boo m sprayers in accordance with the manufacturer’s recommendations.

620.3.8 5 Sprayer Parts

620.3.8 5.1 Tanks

The Contractor shall use tanks for herbicide applications with large openings for easy filling and cleaning and that have a gauge to show the liquid l evel. The Contractor shall equip tanks with a shut-off valve for storing liquid herbicide tempor arily while the Contractor services other sprayer parts.

620.3.8 5.2 Agitators

Section 620: Selective/Non-Selective Herbicide Application Page 690 The Contractor shall equip spray Equipment with hydraulic jet agitators of sufficient size and number to keep the chemical adequately agitated in accordan ce with the manufacturer’s label.

620.3.8 5.3 Strainers

The Contractor shall equip herbicide sprayers with strainers t o prevent clogging of spray nozzles and to protect the working parts of the sprayer. The C ontractor shall clean strainers at least daily, or as specifi ed, and replace if damaged.

620.3.8 5.4 Pressure Gauges

The Contractor shall equip sprayers with a pressure regulator to control the pressure and the quantities of herbicide liquid delivered by the nozzles, an d protect other sprayer parts from damage due to excessive pressure.

620.3.8 5.5 Pumps

The Contractor shall use spraying Equipment with a pump capabl e of supplying the required volume to the spray nozzles. The Contractor shall ens ure that pump parts resist corrosion and abrasion if using abrasive Materials such as wett able powders. The Contractor shall use spraying Equipment with gaskets, plunger caps, and im pellers that resist swelling and chemical breakdown caus ed by liquid herbicides.

620.3.8 5.6 Nozzles

The Contractor shall use nozzles of the design and type that p rovide the proper spray pattern and uniformly distribute the herbicide mixture over the specified areas. The Contractor shall use nozzles composed of the following major components: 1. Nozzle body; 2. Cap; 3. Filter; and 4. Tip or orifice plate. The Contractor shall check nozzles for clogging, as necessary, and maintain them to ensure proper operation of the sprayer. The Contractor shall u se drift-control spot-spraying nozzles. 620.3.8.5.7 Hoses and Fittings The Contractor shall use hoses in accordance with the followin g: 1. Made of neoprene, rubber, or plastic Material having a burst strength greater than the maximum operating pressure; 2. Resistant to oil and other sol vents present in herbicides; a nd 3. Weather resistant. The Contractor shall not use PVC hoses or fittings.

620.3.8 6 Cleaning of Equipment

The Contractor shall ensure that sprayers are in good conditio n and have no leaks while Section 620: Selective/Non-Selective Herbicide Application Page 691 standing, mixing, or spraying. The Contractor shall not leave spraying Equipment at the application site. The Contractor shall clean the spraying Equi pment before arrival at the site. The Contractor shall rinse mixing Equipment into the sprayer ta nk after each use and before topping off the tank. The Contractor shall not clean the Equip ment at the site.

620.3.9 Disposal

620.3.9 1 Disposal of Excess Herbicides

When calibrating the Equipment, the Contractor shall not allow chemical solutions to accumulate. Unmixed concentrated chemicals remain the property of the Contractor. The Contractor shall exercise care with unmixed concentrated chemic als, including those in unopened containers. 620.3.9.2 Disposal of Containers The Contractor shall dispose of empty containers in accordance with NMDA guidelines.

620.3.10 Samples and Inspection

The Contractor shall provide tank samples at the request of th e Department. The Department reserves the right to inspect the tank mix and Equip ment before, during, or after the spraying process. Quality a ssurance inspections are requir ed before any payment.

620.4 Method of Measurement

The Department will measure Selective/Non-Selective Herbicide Application in square feet parallel to the ground surface divided by 43,560.

620.5 Basis of Payment

Pay Item Pay Unit Selective/Non-Selective Herbicide Application Acre Section 621: Mobilization Page 692