Attach G- Engineering Report

10.     Finally, make notes about the local drainage area relative to ongoing construction, erosion problems,
        or high loadings of other materials to the system.


2.4.2   Major Maintenance Inspection (Once a Year)

The primary goal of the major maintenance inspection is to assess the condition of the cartridges relative to
the level of sediment loading. It may be desirable to conduct this inspection during a storm to observe the
relative flow through the filter cartridges. If the submerged cartridges are severely plugged, large amounts of
sediments should be present and very little flow will be discharging from the drainage pipes. It is likely that
the cartridges need to be replaced. Major maintenance inspection will typically involve the steps below.
However, if it appears that a spill of some type has occurred, the local hazard control agency and
Stormwater360 should be notified immediately. In the case of a spill, the worker should abort maintenance
activities until the proper guidance has been obtained.


Steps for Pre-Major Maintenance Inspection

1.      Maintenance to be performed by a skilled worker familiar with StormFilter units.

2.      If applicable, set up safety equipment to protect pedestrians from fall hazards presented by open
        doors. Also, set up appropriate safety equipment for work near roadways.

3.      Inspect the external condition of the unit and take notes concerning defects/problems.

4.      Open the doors to the vault and allow the vault to air out for 5-10 minutes.

5.      Without entering the vault, give the inside of the unit, including components, a general condition
        inspection.

6.      Take notes about the external and internal condition.

7.      Give particular attention to recording the level of sediment build-up on the floor of the vault, in the
        forebay, and on top of the internal components.

8.      Remove large loose debris and trash using a pole with a grapple or net on the end.

9.      If the visit is during a storm, make the flow observations discussed above.

10.     Close and fasten the door, and remove safety equipment.

11.     Make notes about the local drainage area relative to ongoing construction, erosion problems, or high
        loading of other materials to the system.

12.     Review the condition reports from the previous minor and major maintenance visits and schedule for
        cartridge replacement if needed.




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