Guidebook for Selecting Methods to Monitor Airport and Aircraft Deicing Materials (2017) / Chapter Skim
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5 2.1 Parameter Screening Stormwater parameters may be monitored using traditional off-site methods where samples are collected at sample locations by automatic or manual means and sent to an off-site laboratory for analytical testing. Most often, and where they exist, the laboratory analyses use methods that have been specifically approved by regulatory agencies such as the EPA.
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6 Guidebook for Selecting Methods to Monitor airport and aircraft Deicing Materials delayed monitoring results. If a monitoring method for one parameter is to be performed on-site, it may be convenient for airport personnel to perform the analyses for the parameter from other sampling locations on-site as well.
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Identify applicable Monitoring parameters 7 son for using on-site monitoring for compliance purposes, it is critical to determine whether use of the on-site method needs to be approved by the applicable regulatory agencies. 2.2.2 Stormwater or Deicer Management System Process Control Drivers Airports may find that it is beneficial or cost-effective to use on-site monitoring as part of control systems for stormwater or deicer management, even if that on-site monitoring is not used for compliance purposes.
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8 Guidebook for Selecting Methods to Monitor airport and aircraft Deicing Materials the flow rates. As flows and loads change in the stormwater, the airport would have to measure both the flow and the concentrations to accurately determine the load rates, or it may have to cease discharge if a maximum total has been reached.
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From page 9... ...
Identify applicable Monitoring parameters 9 2.3 Potential Monitoring Parameters The potential monitoring parameters applicable to each airport are unique to the airport's permit conditions, deicer types, and deicer management requirements. The term "deicer" as used in this guidebook refers to either aircraft deicing fluids (ADFs)
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10 Guidebook for Selecting Methods to Monitor airport and aircraft Deicing Materials 2.3.3 Surrogates for Primary Deicer Constituents Primary deicer constituent concentrations in stormwater can also be determined using a surrogate parameter. A surrogate parameter is a parameter that is measured instead of the desired parameter.
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Identify applicable Monitoring parameters 11 compounds to determine the oxygen demand. The chemicals completely oxidize the organic compounds.
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12 Guidebook for Selecting Methods to Monitor airport and aircraft Deicing Materials The pH values of stormwater runoff can be affected by multiple conditions, including breakdown of primary deicer constituents on the airfield. Acidic conditions can occur when primary deicer constituents are exposed to warm temperatures, resulting in partial degradation of deicer by bacteria, which results in the byproduct formation of acids.
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Identify applicable Monitoring parameters 13 TSS limits and monitoring requirements in IU permits from POTWs are common. Many stormwater NPDES permits contain monitoring requirements but not TSS limits.
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14 Guidebook for Selecting Methods to Monitor airport and aircraft Deicing Materials The amount of oxygen required in a complete oxidation is known as the theoretical oxygen demand. Using the molecular weights, the following relationships can be found: Propylene glycol concentration: 1 76.09∗ = 76 0.
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Identify applicable Monitoring parameters 15 demand (for COD) or carbon dioxide production (for TOC)
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16 Guidebook for Selecting Methods to Monitor airport and aircraft Deicing Materials Figure 2.1. Parameter screening worksheet.
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Identify applicable Monitoring parameters 17 chemicals in deicers reach threshold concentrations or loadings under certain environmental conditions. The water quality standards can be based on potential toxic effects of individual constituents or on the cumulative effects of multiple constituents.
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