The operation and maintenance of the StormTreat System is limited to annual inspections and solids removal on an as-needed basis. The annual inspections should include the following steps:

1. check the discharge flow rate: the lower outlet is designed to discharge at a rate of 0.5 gallons/minute. This provides for a retention time of approximately two days for the full tank to empty following a runoff event. The discharge rate can be checked by directly measuring a timed-discharge volume if the outlet is "daylighted" or through "falling-level" measurements inside the central sedimentation chambers (the total static volume of the tank is 1390 gallons and the height of the tank is 4 feet, therefore a 0.5 gallons/minute discharge rate can be observed as the water level in the tank falling at a rate of one inch per hour).
2. change the inlet grit filter inside the sedimentation chamber.
3. measure sediment depth inside the sedimentation chamber and schedule a pump-out if depth reaches 6 inches in depth. A future pump-out date can be estimated by projecting based upon sediment accumulation rates since the last measurement or since original installation. On average, StormTreat Systems need to have sediment removed once every three years. This can be done using a standard septic system suction pumper or with a vacuum-pumping unit.
4. observe wetland plant conditions and height (during growing season). Wetland plants may need to be supplemented during the first three growing seasons depending upon local site conditions.