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Development of ADOT application rate guidelines for winter storm management of chemical additives through an ambient monitoring system.

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    The Arizona Department of Transportation (ADOT) is responsible for keeping state and federally  ; owned/operated transportation corridors safe and operational during winter months when snow and ice  ; accumulate on these roads. A common practice is the application of anti‐icing and deicing chemicals, primarily  ; sodium chloride (salt). ADOT’s Winter Storm Management Operations Manual (WSMOM) presents guidelines  ; for the application of anti‐icing and deicing chemical based on specific storm events and roadway conditions.  ; Sodium and chloride can be dispersed to areas adjacent to roadways though melting snow and ice and by  ; vehicle splash and spray. Upon reaching vegetation and soil, these compounds can negatively impact the  ; environment. To evaluate the relationship between salt applications and potential impacts to soil and  ; vegetation, data from winter storm management activities (frequency of application, quantity of salt applied,  ; and adherence to ADOT WSMOM guidelines) were compared to sodium and chloride concentrations in soil and  ; vegetation samples collected at varying distances from the roadway. Data collection and review included 16  ; sites along State Route 260 and U.S. Routes 180 and 191, all in ADOT’s Globe District. Analyses of soil and  ; vegetation samples show that sodium concentrations are greatest nearest the roadway and decrease with  ; increasing distance from the roadway. There is no evidence that sodium concentrations in the soil exceed levels  ; considered tolerable for vegetation, nor is there a significant seasonal difference between fall readings and  ; spring readings of sodium and chloride concentrations in soil and vegetation. Additionally, sodium  ; concentrations in soil samples did not appear to have a statistically significant impact on the level of sodium in  ; vegetation samples. Therefore, it cannot be concluded that sodium concentrations in soil are directly impacting  ; sodium concentration in vegetation near the roadway. There is no evidence to support that ADOT should  ; deviate from its current chemical application rate guidelines. 
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    urn:sha256:aea856f023dc0a8a555bd06f102d39f0ed3bc9af7b9de64fbfd28ea3664899e9
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