Effective with the December 2018 Letting 374 2019 Standard Spec ifications Section 623 Dust Control Surface Treatment
623.1 Description
1.This section describes applying dust control surface treatment to aggregate bases, shoulders, and other drivable surfaces.
623.2 Materials
623.2.1 General
1.Furnish either magnesium chloride or calcium chloride in either a liquid or a solid state. Furnish stable solutions with less than 1 percent sediment falling out of solu tion below 0 F.
2.Provide a certified report o f test or analysis from the manufa cturer or supplier certifying chemical composition. The department will ac cept material based on those certifications as specified in 106.3.3 .
623.2.2 Magnesium Chloride
1.Furnish liquid solutions containing 30 percent or more magnesi um chloride by weight, less than 1 percent calcium chloride by wei ght, and less than 1 percent sod ium chloride by weight.
2.Furnish solid containing 47 percent or more magnesium chloride by weight, less than 1 percent calcium chloride by weight, and le ss than 1 percent sodium chlo ride by weight.
623.2.3 Calcium Chloride
1.Furnish liquid solutions containing 38 percent or more calcium chloride by weight, l ess than 1 percent magnesium chloride by weight, and less than 1 percent sodium ch loride by weight.
2.Furnish solid containing 77 perc ent or more calcium chloride b y weight, less than 1 percent magnesium chloride by weight, and less than 1 percent sodium ch loride by weight.
623.3 Construction
1.The contractor is responsible for dust control on the project as specified in 107.18. Treat vulnerable areas of the project as necessar y to control dust from construc tion equipment and public traffic. Consult with engineer before applying dust control chemical. Ap ply chemical treatment as the engineer directs.
2.Arrange to have available, within 24 hours of receiving notice from the engineer, a sufficient supply of dust control chemical to treat thos e areas of the project vulnerable at any time during construction. Also, provide, within the same 24 hours, sufficient spreading e quipment to apply the chemical. Provide spreading equipment capable of applying the dust control chemic al, uniformly and without runoff, over the treated surface at the s pecified application rate.
3.After shaping and compacting the surface to be treated, apply a sufficient quantity of water to penetrate at least 2 inches. After this pre-wetting and while the surface is still moist but not muddy, apply the required quantity of chem ical uniformly over that sur face at the following rate: 1. For liquids, 0.33 gallons or more/square yard. Do not excee d 0.50 gallons/square yard. 2. For solids, 1.5 pounds or more/square yard. Do not exceed 2 pounds/square yard.
4.Do not apply dust control chemical in the rain, when the offic ial weather bureau forecasts rain within 24 hours, or under other condition s that might result in a significant loss of material.
623.4 Measurement
1.The department will measure Dust C ontrol Surface Treatment by the square yard acceptably completed. The engineer may calcul ate the yardage using volume or weight and applying a conversion factor.
623.5 Payment
1.The department will pay for the measured quantity at the contr act unit price under the following bid item: ITEM NUMBER DESCRIPTION UNIT 623.0200 Dust Control Su rface Treatment SY
2.Payment for Dust Control Surfac e Treatment is full compensatio n for providing the dust control treatment and pre-wetting water. Effective with the December 2018 Letting 375 2019 Standard Spec ifications Section 624 Water
624.1 Description
1.This section describes furnishi ng, hauling, and applying water to compact embankm ents and base, re- compacting existing base, or dust control within the right-of-w ay.
624.2 Materials
1.Use water that is reasonably clean and free of harmful materia ls.
624.3 Construction
1.Haul and apply water using vehicles equipped with watertight t anks. Equip the tanks with a suitable pressure-type distributor device that allows uniform applicatio n over the specified area. Use tanks with a minimum capacity of 1000 gallons and equipped with positive s hut-off valves controlled while the vehicle is in motion.
2.Uniformly apply the water and incorporate in the manner and qu antities, at the times, locations, and purposes that the engineer orders or allows. Load and unload th e tank and operate the equipment in a way that does not waterlog or damage the subgrade or base.
624.4 Measurement
1.The department will measure Wate r by the thousand gallon units (MGAL). The quantity measured equals the volume of water furnished and applied as the enginee r directs according to the contract. The department will determine the volume by engineer-approved m eters, or from tanks of known capacity.
624.5 Payment
1.The department will pay for measured quantities at the contrac t unit price under the following bid items: ITEM NUMBER DESCRIPTION UNIT 624.0100 Water MGAL
2.Payment for Water is full compen sation for providing, hauling, and applying or incorporating the water.
3.If the contract does not conta in the bid item Water, then furn ishing and applying water is incidental to other items of work.
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Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 383–383 of 601. View official source ↗