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Line 562:
Line 562: K<sub>S</sub> < 1.5 x 10-6 cm/s
→Water Treatment Performance Evaluations
*Parallel measurement and sampling of outflow from a nearby, untreated drainage area is needed to evaluate water treatment performance of BMPs where inlet monitoring is not feasible.
*Parallel measurement and sampling of outflow from a nearby, untreated drainage area is needed to evaluate water treatment performance of BMPs where inlet monitoring is not feasible.
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|'''Storm Event Size and Duration''
|'''Flow-Weighted Sampling Method '''
|i < 15 mm/h;
|How individual water samples are combined to produce the composite sample for laboratory testing will greatly affect results.
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*When part of an Assumption inspection, issue a stop work order and contact the construction site supervisor, design professionals and property owner or project manager to determine follow-up tasks. Follow-up tasks involve scheduling FIT work to do further testing to determine the affected area and depth and decide on corrective actions.
*Composite samples should be generated by examining flow rate over the period each sample was taken, calculating what proportion of the total flow during the event that represents, and using this relationship to measure the quantity taken from each sample bottle to produce the composite sample.
*Corrective actions may involve removal of any accumulated sediment and plantings and tilling of the topsoil to between 20 and 30 cm depth to eliminate surface crusting, increase porosity and reduce compaction. If testing indicates low organic matter content, topsoil should be amended with compost prior to tilling.
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|'''Storm Event Size and Duration'''
|To adequately characterize water treatment performance, monitoring results from a range of storm event sizes is needed which requires that the programming of automated water samplers should be capable of capturing flow from a range of storm event depths and durations.
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*Start with collecting 500 mL aliquots every 10 minutes after flow is initiated. For an automated water sampler that contains 24 one litre bottles, this allows sampling over an 8 hour period.
*Sampling frequency should be adjusted to optimize between filling all the bottles in the sampler with capturing as much of the period of flow as possible.
*Alternatively, automated samplers can be coupled with flow measurement apparatuses to alter sampling frequency as flow rate changes.
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|'''Water Quality Parameters of Interest '''
|The cost of laboratory testing of water samples increases with the number of parameters to be tested. Water treatment performance evaluations should focus on the parameters of greatest concern from regulatory or receiving water sensitivity perspectives.
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*As most pollutants common to urban stormwater runoff are associated with suspended solids, focus on evaluating Total Suspended Solids (TSS) removal efficiency.
*For nutrient-limited receiving waters, add nutrient testing (Total Phosphorus and Phosphate, Total Nitrogen, Nitrate and Nitrite).
*For bacteria limited receiving waters add bacteria testing. When bacteria removal performance is to be evaluated, samples must be submitted for laboratory testing within 48 hours of the end of the storm event or refrigerated samplers are needed.
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|'''Security of Monitoring Equipment'''
|In some cases, monitoring equipment will need to be installed at the ground surface, and require means of preventing tampering or sabotage.
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*House automated water samplers in protective structures that are securely locked and inaccessible.
*Samplers should also be placed directly into manholes where possible.
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|'''Confined Space Entry'''
|Installing and checking flow monitoring and sampling equipment often requires entry into confined spaces.
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*Monitoring that involves confined space entry requires adequately trained staff equipped with certified and recently calibrated safety equipment.
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===Accredited Water Testing Laboratories (ON)===
*Accuracy Environmental Laboratories Ltd.
*AGAT Laboratories Ltd.
For further information regarding natural and simulated storm event testing, acceptance criteria per LID BMP type and associated testing tools and protocols scroll down to the embedded 2016 guide below.
For further information regarding natural and simulated storm event testing, acceptance criteria per LID BMP type and associated testing tools and protocols scroll down to the embedded 2016 guide below.