Nutrient / Creek Monitoring Device

The Big Bear Municipal Water District (MWD) is implementing a STORMWATER & NUTRIENT MONITORING program. The MONITORING DEVICE is the ISCO's 6700 Series Sampler.

Samplers
An automatic sampler periodically collects samples from the flow stream. Its controller is programmed to initiate each collection sequence and to regulate the amount collected, as well as where it is deposited.

Samples may be collected at fixed intervals or after a set volume of storm-water has passed the monitoring point. To do the latter, the sampler must receive signals from a flow meter. Such samples are said to be flow-weighted.

Regulations require some industries to collect a "first flush" sample, typically during the first 30 minutes of a storm event, as well as a flow-weighted composite sample for the entire storm event.

Depending on the pollutants to be monitored, and the specific analyses to be performed, glass or plastic bottles may be desired. The EPA recommends glass when sampling for oil and grease or metals and toxic pollutants.

Stormwater monitoring regulations require that samples be analyzed for a variety of properties, including pH. Since pH begins to change the moment a sample is collected, stormwater monitoring systems often include a pH meter.

Data Collection
When the storm event is over, the sample bottles are taken to a laboratory to determine the types and amounts of pollutants in the runoff.

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