Storm Water Inspections
Oil Water Separator (OWS)
Oil Water Separator (OWS)
Remove the manhole cover on both the sediment chamber and the oil & water chamber.
Using your tank stick, Lower it slowly into the sediment chamber next to the baffle (this will be the first chamber where the liquid enters the Oil Water Separator) until you feel the sediment.
Pull the tank stick out and document the results in inches.
Reinsert the tank stick in the same location, going all the way down to the bottom chamber.
Document the number in inches.
Subtract the first number from the second number and you will have the amount of sediment in inches.
Apply water finding paste (Sargel) to the bottom 24 inches of your tank stick.
Lower the tank into the oil water chamber (the second manhole) only to the 24 inch mark, pull the stick out and document how much of the water finding paste is still white. This is the amount of oil/fuel that is on top of the water.
Wipe of the tank stick and reinsert the stick into the second chamber and lower to the bottom. Pull the tank stick out and document the total water/fuel level in inches.
Catch Basin
Flow Restrictions
*Inspect the catch basin to insure the flow is not blocked in any way. Inspect the flow coming in and going out. For a structure to fail it must be blocked by 75% .
Product present.
*Inspect the structure for any free standing fuel.
Functioning and operating properly
*Inspect the structure to identify any issues that will prevent the Structure from operating properly
Picture of Catch Basin
Hydrodynamic Separator (HS)
Flow Restrictions
*Inspect the HS to ensure the flow is not blocked in any way. Inspect the flow coming in and going out. For a structure to fail it must be blocked by 75% .
Product present.
*Inspect the structure for any free-standing fuel. Functioning and operating properly
*Inspect the structure to identify any issues that will prevent the Structure from operating properly A tank stick reading is required for this structure. First, lower the tank stick slowly until you feel the top of the sediment layer. If the measurement is lower than 36 inches the structure fails if it is Storm Water Inspection Training above 36 inches the structure passes.
Hydrodynamic separator lid.
Inside an Hydrodynamic separator
Retention Area
Flow Restrictions
*Inspect the catch basin to insure the flow is not blocked in any way. Inspect the flow coming in and going out. For a structure to fail it must be blocked by 75% .
Product present.
*Inspect the structure for any free standing fuel.
Functioning and operating properly
*Inspect the structure to identify any issues that will prevent the Structure from operating properly
Rip Rap/ curb cuts
These are the large rocks used in or around a retention area to slow down the flow of the of liquids these structures are not identified in IDS as a structure rather they are inspected with the retention areas.
Vegetation blocking flow
Most of the retention areas have grasses planted. These must be maintained to allow proper flow. All vegetation must be below 10 inches in ored tpo pass and can not block the flow in any way.
Retention Area
What to look for
Product Staining
This is a result of repeated exposure to product that leaves behind a dark or black stain on a surface.
Erosion
This happens over time when the soil is eroded in or around the Rip Rap it will result in Standing water.
Rip Rap
The rip rap can be rendered useless if it is covered in sediment and or any other material.
Trench Drains
These are typically located near the fueling lanes or at the entrance/exit and can be identified by their long slim design most of these will drain into an Oil Water Separator which will be discussed later in this training.
Flow Restrictions
*Inspect the catch basin to insure the flow is not blocked in any way. Inspect the flow coming in and going out. For a structure to fail it must be blocked by 75% .
Product present.
*Inspect the structure for any free standing fuel.
Functioning and operating properly
*Inspect the structure to identify any issues that will prevent the Structure from operating properly
Above Ground Pond (AP)
Flow Restrictions
*Inspect the catch basin to insure the flow is not blocked in any way. Inspect the flow coming in and going out. For a structure to fail it must be blocked by 75% .
Product present.
*Inspect the structure for any free standing fuel.
Functioning and operating properly
*Inspect the structure to identify any issues that will prevent the Structure from operating properly
Any Product will be sitting on top of any water in the pond These typically have an Outlet Control Structure in them.
Underground Detention System (UD)
This is a pond like structure that is under the parking lot it can be identified by several manholes or drains running in parallel to another set of the same drains
Flow Restrictions
*Inspect the catch basin to insure the flow is not blocked in any way. Inspect the flow coming in and going out. For a structure to fail it must be blocked by 75% .
Product present.
*Inspect the structure for any free standing fuel.
Functioning and operating properly
*Inspect the structure to identify any issues that will prevent the Structure from operating properly
***Some of these are manholes we do not enter any manholes we inspect from ground level***