DESCRIPTION
637.01.01 General. This work consists of the installation, maintenance, and removal of temporary pollution
control Best Management Practices (BMPs) intended to provide prevention, control , and abatement of water and air pollution during construction of the project to the maximum extent practicable. Temporary pollution control and erosion control work shall conform to the requirements of NDOT’s "Construction Site Best Management Practices ( BMPs) Manual," hereinafter referred to as the Manual, and addenda thereto issued up to, and including, the date of advertisement of the contract. The Manual is available for purchase, or can be accessed on the NDOT website. Adhere to the Manual’s minimum r equirements found in Section 2 for the selection and implementation of construction site BMPs. Know and fully comply with the provisions of the Manual, and Federal, State, and local regulations governing storm and non- storm water discharges from both the project site and areas of disturbance outside the project limits during construction. Pursuant to NRS Chapter 625, a Nevada Registered Civil Professional Engineer (PE) shall design and/or review and stamp plans that require engineered calculations. BMPs requiring sizing shall be designed and/or reviewed and approved by a qualified Professional Civil Engineer, registered in the State of Nevada. Refer to Section I.B. of the Stormwater General Permit NVR100000 and the Manual fact sheets for determining when designed BMPs are required. A Storm Water Pollution Prevention Plan (SWPPP) shall be developed and implemented and documented stormwater inspections shall be performed once every 7 days and within 24 hours of storm events 12.5 mm (0.5 in.) or greater, regar dless of Stormwater General Permit NVR100000 procurement. Temporary pollution control BMPs shall remain in- place until contract work requiring their removal occurs or final stabilization as defined in the Stormwater General Permit NVR100000 is achieved.
637.01.02 Water Pollution Control Manager. Designate a Water Pollution Control Manager who has
successfully completed a minimum of 8 hours of stormwater training within the last 3 ye ars. The training shall include stromwater permitting requirements , implem entation and inspection of temporary pollution control BMPs , recognition of construction activities that may impact stormwater quality, and i dentification of illicit discharges or illicit connections to the storm sewer system. Submit t raining certificates prior to the start of construction activities. The Water Pollution Control Manager shall be responsible for the preparation of the Stormwater General Permit NVR100000, Temporary Working in Waterways/Discharge Permit, and/or De Minimis Clean Water Dischar ge Permit applications and their required modifications or amendments. The Water Pollution Control Manager shall be responsible for developing and implementing the SWPPP as specified by the Stormwater General Permit NVR100000 and these specifications. The Water Pollution Control Manager shall be responsible for installing, maintaining, and removing all temporary pollution control BMPs shown on the SWPPP, in accordance with the requirements of the Stormwater General Permit NVR100000, the Manual, and as direc ted. The Water Pollution Control Manager shall serve as the primary contact for issues related to the SWPPP, permits or their implementation and shall be available 24 hours a day from the first day of activities until final stabilization is achieved for the entire project, or the contract is completed, whichever occurs first. The Water Pollution Control Manager shall be responsible for reporting to the Engineer any illicit discharges (40 CFR § 122.26(b)(2)) or illicit connections to the storm sewer system found within the project limits no later than 24 hours of discovery.
637.01.03 Permits. Not all projects require the permits discussed in this Subsection. See the Manual for
criteria mandating permit procurement. Contact the Nevada Division of Environment al Protection (NDEP), Bureau of Water Pollution Control, a minimum of 7 days prior to the preconstruction conference to procure the appropriate permits. Inform NDEP if equipment will operate in drainages or if dewatering is planned to accomplish the items of work.
a.Stormwater General Permit NVR100000. Prepare a Storm Water Pollution Prevention Plan (SWPPP) prior to submittal of the Notice of Intent (NOI). File an NOI a minimum of 2 working days prior to commencement of construction with NDEP with appropriate filing fee to obtain coverage under the Stormwater General Permit NVR100000. Include the Engineer’s name and NDOT contract number in Section 2 of the NOI. Ensure that the billing information (Section 4 of the NOI) reflects that the Operator (Contr actor) is to receive the invoice for annual permit renewal. Ensure that NDOT’s Contract Number is referenced in the NOI. 637 TEMPORARY POLLUTION CONTROL Provide a copy of the NOI Certification Statement prior to beginning work. Furnish a copy of the initial SWPPP prior to the commencem ent of any construction activities. The SWPPP will not be reviewed or approved by NDOT or NDEP, but is provided as evidence of SWPPP preparation. The SWPPP shall remain on the project site, updated according to NDEP requirements, as a living document during the project and shall be made immediately available upon request to NDEP, NDOT, FHWA, or government officials inspecting the construction site. Document existing vegetation in areas that will be disturbed with photographs before commencing ground- disturbing activities. Prior to filing the Notice of Termination with NDEP, photo- document the post construction site conditions to demonstrate the vegetation re- establishment or post project stabilization. Submit electronic or digital color photos for pre and post construction stabilization documentation. Design and install BMPs such that flooding or ponding is not caused outside of right -of-way or poses a hazard to motorists, pedestrians, or any other user. Refer to Section II.A. of the Stormwater General Permit NVR100000 for complete SWPPP requirements, and to the Manual fact sheets for individual BMP minimum requirements. Use the SWPPP template found in the Manual or another template acceptable to NDEP. Refer to the NDEP website http://ndep.nv.gov/bwpc/storm01.htm for a copy of the Stormwater General Permit NVR100000 and information pertaining to SWPPP development. Stormwater General Permit NVR 100000 covers storm water discharges from Department -furnished material sources for general fill material, aggregate and/or staging a temporary asphalt or concrete batch plant operation dedicated solely to this contract. Address temporary pollution control BMPs for these areas in the SWPPP.
b.Temporary Working in Waterways/Discharge Permit . This permit is required whenever construction is performed within, or in the vicinity of, “Waters of the State” (NAC 445A.415) and/or whenever 401 Water Quality Certification is required. Said work is intended to provide prevention and control of pollutants and sediment transport downstream by employing BMPs. Prior to commencing work below the ordinary high water mark of a “Waters of the State,” submit to the NDEP Bureau of Water Pollution Control, Permits Branch, the required permit application for a Te mporary Working in Waterways/Discharge Permit to be issued to the Contractor. The review and approval process may take up to four weeks. If a change is proposed to the information contained in the approved permit application, contact NDEP for their approval. Changes shall not be made in the field until receiving NDEP approval.
c.Temporary Discharge Permit. If a Temporary Working in Waterways/Discharge Permit is not required for a project including dewatering operations, a Temporary Discharge Permit may b e necessary. Review Manual fact sheet NS -2 of Section 6 for specific requirements.
d.De Minimis General Permit NVG201000. This permit authorizes specific intermittent or continuous discharges into a “Waters of the U.S.” (33 CFR § 328). Refer to the perm it for discharge specific NOI sampling requirements, discharge limitations, monitoring requirements , and conditions. Submit a signed copy of the NOI Certification Statement.
637.01.04 Noxious Weed Management. Develop and follow a Noxious Weed Management Plan to prevent
the establishment and spread of Nevada State listed noxious weeds per NRS 555 (available at http://agri.nv.gov/PLANT_NoxWeeds_index.htm). The management plan shall include mapping of existing noxious weed populations, appropriate eradicat ion/control methods based on weed type, location, applicator certification, monitoring, and retreatment as necessary. Include methods for keeping equipment, personnel, staging areas, construction and excavation sites, and roadways clear of noxious weed plants and seeds. The plan shall also address the treatment of weeds in topsoil salvage material. Submit the plan at the pre construction meeting. Equipment leaving noxious weed infested areas shall be cleaned prior to moving to another location. Equipment c oming into or leaving the project area shall be cleaned and the cleaning area kept clear of plant material and contaminated dirt to prevent weed spread. TEMPORARY POLLUTION CONTROL 637 CONSTRUCTION
637.03.01 General. On any project requiring 401 Water Quality Certification, submit digital or electronic color
photographs with associated description of sediment and erosion structural controls and BMPs within two weeks of their installation. Be responsible throughout the duration of the project for installing, constructing, inspecting, maintaining, replacing, removing, and disposing of the BMPs specified in the SWPPP, Temporary Working in Waterways Permits, and any other applicable permit. Install BMPs at the earliest pr acticable time for each construction phase. Repairs and/or placement of temporary pollution control BMPs shall begin within 24 hours of notification of a deficiency and shall be completed within 7 days. Should this restriction be exceeded, work may be imm ediately suspended and no other items of work shall be performed until the repairs are completed. Working days will continue to be assessed during the suspension period and partial payments as set forth under Subsection 109.06 may not be forthcoming until said repairs are completed. Do not remove BMPs until the disturbed area being protected achieves final stabilization as defined by Stormwater General Permit NVR100000. This may require BMPs be left in- place following the completion of construction activit ies. Properly maintain such BMPs, specified in the Manual, until the project is accepted. Submit a copy of the most updated SWPPP upon contract completion. File a separate NOI with NDEP to apply for coverage under the Stormwater General Permit NVR100000 for ground disturbance areas outside of NDOT Right -of-Way and not displayed in the plans. Contractor furnished material sources, staging areas, plant sites, turnaround areas , or any other contractor caused ground disturbance outside the right -of-way and not shown in the plans are the Contractor’s responsibility and shall be submitted under a different NOI package from the ground disturbance within right -of-way and shown on the plan sheet details. As these separate Stormwater General Permits are the sole responsibility of the Contractor, NDOT shall not be listed as an Owner or Operator. Provide a copy of all separate signed NOI certification statements. The Department is not responsible for delays caused by incomplete or inaccurate submittals to NDEP by the Contractor. The Contractor is solely liable for any suspension of work due to regulatory agency, e.g. NDEP, enforcement actions resulting from permit, e.g. Stormwater General Permit NVR100000, non- compliance. Land disturbance areas beyond those depicted in the contract documents resulting from Contractor construction activities shall undergo final stabilization at the Contractor’s expense. These include, but are not limited to, unidentified staging areas, turnaround areas, employee parking areas , and areas of ingress and egress. Submit final stabilization plans for Departmental review and approval.
637.03.02 Dust Control. Develop, obtain, and pay for all State and local entity permits and fully comply
with the terms specified therein. Furnish and apply w ater or chemical dust palliative for controlling dust on the areas designated and according to permit conditions. Use equipment and obtain water as specified in Subsection 107.21. Control dust originating from traffic, plant, or construction operations ei ther inside or outside the right of way at all times according to Federal, State, and local laws, ordinances, and regulations. Use dust palliatives listed in the QPL. Consult the Manual fact sheets for appropriate product selection. Mix and apply dust palliative as recommended by the manufacturer. Prepare the soil for application of dust palliative according to manufacturer instructions. Apply additional applications of dust palliative to control dust or as required by air quality regulating authorities. Maintain all disturbed areas in a condition to prevent wind erosion and particulate emissions 24 hours a day, 7 days a week until the construction site is completely stabilized as shown on the plans and as required. For contracts in Clark County, provide a copy of the Clark County Department of Air Quality Management “Dust Control Permit” for construction activity prior to beginning work. Provide a copy of the final inspection and release from the Clark County Department of Air Quality Management “Dust Co ntrol Permit” upon completion of construction activities. 637 TEMPORARY POLLUTION CONTROL Immediate notification will be given in writing for failure to maintain adequate dust control and may result in immediate suspension of construction operations. If failing to remedy unsatisfactory dust control within 1 hour after receipt of such notice, the Engineer may immediately proceed to take necessary action to maintain dust control and the entire cost of this maintenance will be deducted from money due or to become due. METHOD OF MEASUREMENT
637.04.01 Measurement. Temporary pollution control will be measured by the lump sum.
Dust control will be measured by the lump sum. BASIS OF PAYMENT
637.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contrac t
price bid per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment for temporary pollution control by the lump sum will be full compensation for all work required in this Section, with the exception of dust control. Payment for dust control will be made separately. Partial payments for temporary pollution control and dust control will be made as the work progresses. The Engineer will determine the reasonable payment percentage for each payment cycle. When requested, furnish invoices and receipts for actual costs. The amount paid on the next progress payment will be 50% of the amount determined. The remaining percentage will be prorated accordi ng to job progress. However, if temporary pollution control or dust control become inadequate, payment will cease and the provisions of Subsection 637.03.02 may be enforced. A maximum amount of 5% of the original contract amount will be paid for temporary pollution control during the progress of the work. Upon completion of all work on the project, payment of any amount bid for temporary pollution control in excess of 5% of the original contract amount will be paid. A maximum amount of 5% of the original contract amount will be paid for dust control during the progress of the work. Upon completion of all work on the project, payment of any amount bid for dust control in excess of 5% of the original contract amount will be paid. Payment will be made under: Pay Item Pay Unit Temporary Pollution Control ..................................................................................................................................................... Lump Sum Dust Control ............................................................................................................................................................................. Lump Sum SECTION 640 RETAINING WALLS DESCRIPTION
640.01.01 General. This work consists of constructing masonry block retaining walls.
MATERIALS
640.02.01 General. Material shall conform to the following Sections and Subsection:
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Reinforcing Steel ................................ .................................................................................................................................... Section 505 Portland Cement ................................ .................................................................................................................................... Section 701 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Water ..................................................................................................................................................................................... Section 722 Unless otherwise specified, use Class A or Class AA concrete. Class D may be substituted for Class A concrete or Class DA may be substituted for Class AA concrete. Masonry block shall be slump block or split face block of the dimensions shown on the plans and conforming to ASTM C90, Type I. Add an integral color pigment to all concrete block and mortar, except the grout used in filling cells. The color pigment shall consist of a synthetic mineral oxide specifically manufactured for coloring masonry products and mortar. Obtain the integral coloring by mixing the pigment material with the other ingredients in a sequence and by methods that will result in a uniform color. Unless otherwise indicated on the plans, the color of the concrete blocks and mortar shall approximate Federal Standard No. 37875 as shown in Table VIII of Federal Standard No. 595B. The final color selections will be subject to approval. The polyvinyl chloride premolded joint filler shall conform to Subsection 707.03.03 (c). CONSTRUCTION
640.03.01 General . Give not less than 10 days notification in advance of shipment of concrete blocks to the
jobsite for testing before shipment. Provide a separate storage area for concrete blocks which have been tested and accepted but are stockpiled for later delivery to the jobsite. Construct footings according to Section 502. Compose mortar for masonry wall s of 1 part Portland cement to not more than 3 parts surface dry mortar aggregate by volume, to which hydrated lime may be added in the quantity of 25% by volume of cement. Treat hydrated lime as an addition to and not as replacing any cement. Hydrated lim e shall conform to ASTM C207, Type S. Prepared mortar mix may be substituted if approved. All grout used to fill cells shall attain a minimum compressive strength of 17 MPa (2,500 psi) in 28 days when tested according to Test Method No. Nev. T427. Constr uct the masonry wall true and plumb. Lay straight uniform courses in common bond with vertical joints aligned over center of unit below as shown on the drawings. Align all vertical cells. Mortar joints shall be 9.5 mm (0.375 in.) thick. Lay all blocks wit h horizontal and vertical mortar joints buttered along face edges for a depth equal to thickness of face shells, also on the webs surrounding the cells to be filled. Shove vertical joints tight. Concave tool joints smooth. Keep all wall surfaces clean and free from mortar blotches. Place reinforcement as shown on the plans. Solidly fill cells with grout according to the details shown on the plans.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 463–466 of 610.