Effective Removal of Pavement Markings (2013) / Chapter Skim
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Pages 75-92
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From page 75... ...
75 Beyond the survey and field removal of pavement markings, the research team also evaluated three other areas of interest to the research project. These areas, described in this chapter, are environmental and worker safety issues, temporary tape pavement markings, and masking of markings or blending of removed areas.
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From page 76... ...
76 Hazardous Waste. In order to determine whether a pavement marking removal waste stream is producing toxic hazardous waste, the responsible party should either test the waste using the Toxicity Characteristic Leaching Procedure (TCLP)
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77 and TSCA information can be useful when constructing a new MSDS document. Some MSDSs may contain code letters that are used in the TSCA Inventory to identify substances that are the subject of an EPA rule or order promulgated under TSCA, or to indicate a full or partial exemption from TSCA reporting requirements.
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78 irrigation overflow) can be discharged from CDOT's storm drain system (CDOT 2008)
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79 The limits include primary and secondary standards. Primary standards set limits to protect public health, including the health of sensitive populations such as asthmatics, children, and the elderly.
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80 to the extent that removal creates additional airborne sources of VOCs or HAPs. VOCs released from pavement marking material removal have not been identified as a significant source of VOCs.
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81 by collecting personal samples representing a full shift of work. Exposure to lead during removal of pavement marking materials could occur, depending on the type of removal process used and the type of material being removed.
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82 marking material, asphalt and oil, and other contaminants on the asphalt surface. Asphalt contains aliphatic hydrocarbons in addition to the mononuclear aromatics and polycyclic aromatic hydrocarbon (PAH)
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83 Chemical System Chemical systems would only be used on paint. There are some paint systems designed specifically to be removed with a chemical system.
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84 normally only occur during removal of material containing lead, chromium, silica, or asbestos. The following factors should be considered when assessing the potential lead or chromium exposure hazard: • The amount of contaminant in the materials being removed.
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86 ing was more difficult to pull up. There was no evident trend on the concrete surface, but the average values overall were higher than on the asphalt surface.
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87 asphalt ranged between 3.0 and 5.9, and between 4.1 and 7.9 on concrete. Overall, the discernability on concrete remained higher than on asphalt 30 days after removal.
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88 Figure 52 provides the summary of the discernability data for black markings on asphalt and concrete surfaces 30 days after removal. The average discernability ranged between 3.6 and 4.9 on asphalt 30 days after removal and between 5.3 and 7.2 on concrete 30 days after removal.
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From page 89... ...
89 • Will the underlying markings be removed or remain in place? • Based on the expected service life of the surface treatment and markings left in place, could the markings begin to show through prior to installing a new road surface?
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From page 90... ...
90 removal would become less evident as the surface treatment wore away. Masking Markings Using Marking Materials In some instances where markings only need to be removed for a short period of time, it may be beneficial to just cover the markings instead of removing them.
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91 means of counteracting this would be to produce tapes of differing shades to better match road surfaces. The smaller production quantities of these types would greatly increase the costs, but the results could be much better.
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From page 92... ...
92 would not be a viable option on concrete road surfaces. On concrete surfaces or asphalt surfaces where a fog seal is not viable, color-matching paint or mottling colors like the tape in the previous section would be viable options.
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