Development of ADOT application rate guidelines for winter storm management of chemical additives through an ambient monitoring system.
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2015-10-01
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Abstract: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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Main Document Checksum:urn:sha256:aea856f023dc0a8a555bd06f102d39f0ed3bc9af7b9de64fbfd28ea3664899e9