Appendix A:
MaineDOT Treatment Recommendations

Table A. MaineDOT Treatment Recommendations
Treat #	PAVEMENT TEMPERATURE RANGE AND TREND	INITIAL OPERATION				SUBSEQUENT OPERATIONS			COMMENTS
		Pavement surface at time of initial operation	Maintenance Action	Chemical Application		Maintenance Action	Chemical Application
		Pavement surface at time of initial operation	Maintenance Action	Liquid Pre-Wet Gals/Ton	Rock Salt Lbs/lm	Maintenance Action	Liquid Pre-Wet Gals/Ton	Rock Salt Lbs/lm
1	Above 32° F steady or rising	Wet, slush, or light snow cover	Plow as needed and monitor pavement temps.	Salt Brine 10 gals/tn	0-150	Plow as needed and monitor pavement temps	Salt Brine	0-150	1) Monitor pavement temperature closely for drops toward (32oF) and below 2) Treat icy patches if needed with Rock Salt at (150 lb/lane-mi); plow if needed
2	28-32° F	Wet, slush, or light snow cover	Plow as needed; reapply solid pre-wetted chemical when needed	Salt Brine 10 gals/tn	150-250	Plow as needed; reapply solid pre-wetted chemical when needed	Salt Brine	100-200	1) Applications will need to be more frequent at lower temperatures and higher snowfall rates
3	20 to 28° F	Wet, slush, or light snow cover	Plow as needed; reapply solid pre-wetted chemical when needed	Salt Brine, MgCl2 CaCl2 10 gals/tn	250-350	Plow as needed; reapply solid pre-wetted chemical when needed	Salt Brine	200-300	1) Applications will need to be more frequent at lower temperatures and higher snowfall rates
4	15 to 20° F	Wet, slush, or light snow cover	Plow as needed; reapply solid pre-wetted chemical when needed	MgCl2 CaCl2 10 gals/tn	350-450	Plow as needed; reapply prewetted solid chemical when needed	MgCl2 CaCl2 10 gals/tn	300-400	1) Applications will need to be more frequent at lower temperatures and higher snowfall rates
5	Below 15° F steady or falling	Dry or light snow cover	Plow as needed			Plow as needed			1) It is not recommended that chemicals be applied in this temperature range 2) Abrasives can be applied to enhance traction 3) On higher speed corridors, if glazing occurs and sand will not stay in travel lanes, higher applications of rock salt may need to be applied with consent from Region Management.

Reference standard notes.

CHEMICAL APPLICATIONS: (1) If snow is blowing off the roadway and glazing or pack is not occurring, do not apply materials. (2) Time initial and subsequent chemical applications to prevent deteriorating conditions or development of packed and bonded snow. (3) Apply chemical ahead of traffic rush periods occurring during storm. (4) Higher volume corridors will often require an additional 50 lbs per lane mile above recommended amounts. (5) Snowfall greater than 1” per hour will often require an additional 50 lbs per lane mile above recommended amounts.

PLOWING: If needed, plow before chemical applications so that excess snow, slush, or ice is removed and pavement is wet, slushy, or lightly snow covered when treated.

TEMPERATURE TRENDS: If temperature trend is rising, use lower end of application range and conversely, if temperature trend is dropping use higher end of application range.

PRE-WETTING: If salt brine is not available, liquid calcium or magnesium chloride may be used if bounce and scatter will be a problem, i.e. conditions not wet enough.

FROST AND BLACK ICE: If frost or black ice is forecast and pavement temps will be above 20 degrees F, pre-treat with salt brine at 50 -60 gals per lane mile on designated corridors. Areas not designated for pre-treatment should apply as necessary at a rate of 150-250 lbs per lane mile.

FREEZING RAIN/SLEET: Freezing rain and sleet will dilute treatments sooner and may require more frequent re-application.

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Appendix A:MaineDOT Treatment Recommendations

Appendix A:
MaineDOT Treatment Recommendations