Guidebook for Selecting Methods to Monitor Airport and Aircraft Deicing Materials (2017) / Chapter Skim
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Pages 18-22
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18 C h a P T E r 3 3.1 Screening of Monitoring Types Monitoring type refers to the general means by which samples are collected and analyzed. For the purposes of this guidebook, monitoring type falls into two main categories: • Off-site monitoring types, and • On-site monitoring types.
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From page 19... ...
Identify applicable Monitoring Types 19 a whole has several potential disadvantages, the severity of which is site-specific. The possible disadvantages include that: • Sampling, particularly if performed manually, can be expensive because of labor costs; • The logistics and timing of dispatching sampling staff can be a challenge, especially if sampling sites are difficult to access or adverse weather presents a safety hazard; • There are typically regulatory requirements for sample handling, transportation, and storage; • Only the stormwater characteristics at the time of sample collection are measured; • It can be difficult to capture the variability of stormwater characteristics or catch particular conditions, such as peak deicer discharge periods; • Hold times for analytical samples can provide constraints in developing the desired sampling program; • Typically there is a delay before results are available from the laboratory, ranging from 1 to 3 weeks; and • Real-time decisions cannot be made based on sample results.
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From page 20... ...
20 Guidebook for Selecting Methods to Monitor Airport and Aircraft Deicing Materials To obtain reliable analytical data, strict quality assurance/quality control (QA/QC) procedures should be followed during stormwater sampling activities.
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From page 21... ...
Identify Applicable Monitoring Types 21 Handheld monitors typically require periodic calibration, ranging from every few hours for pH meters to approximately annually (or longer) for temperature meters.
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From page 22... ...
22 Guidebook for Selecting Methods to Monitor Airport and Aircraft Deicing Materials allows substantial quantities of data to be collected under a wide variety of conditions, eliminating the need to mobilize staff for limited sampling events. Online monitors also greatly increase the chances of characterizing unpredictable swings in stormwater characteristics that are a common occurrence with deicer discharges.
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