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A method of mounting a grate adapter unit beneath a stormwater collection grate includes steps of providing a grate adapter unit having a plurality of outwardly extending mounting flanges, each mounting flange being adapted to fit a different size commercially common stormwater collection grate. The

A method of mounting a grate adapter unit beneath a stormwater collection grate includes steps of providing a grate adapter unit having a plurality of outwardly extending mounting flanges, each mounting flange being adapted to fit a different size commercially common stormwater collection grate. The grate adapter unit is trimmed, either at the factory, at the contractor's facilities or at the installation site, at the desired location to select a desired one of the mounting flanges that is appropriate for the collection grate to which the grate adapter is being fit. The grate adapter unit is then mounted beneath the stormwater collection grate using the selected mounting flange. A stormwater remediation unit may be pre-mounted to a lower end of the grate adapter unit or mounted to the lower end after installation.

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1. A method of mounting a grate adapter unit beneath a stormwater collection grate, comprising steps of: providing a grate adapter unit having more than one mounting flange;trimming said grate adapter unit to select one of said mounting flanges; andmounting said grate adapter unit beneath a stormwat

1. A method of mounting a grate adapter unit beneath a stormwater collection grate, comprising steps of: providing a grate adapter unit having more than one mounting flange;trimming said grate adapter unit to select one of said mounting flanges; andmounting said grate adapter unit beneath a stormwater collection grate using said selected mounting flange. 2. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, further comprising a step of mounting a stormwater remediation unit to said grate adapter unit. 3. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said grate adapter unit is adapted to seal said grate. 4. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said grate adapter unit comprises at least two mounting flanges. 5. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 4, wherein said grate adapter unit comprises at least three mounting flanges. 6. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 5, wherein said grate adapter unit comprises at least four mounting flanges. 7. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 6, wherein said grate adapter unit comprises at least five mounting flanges. 8. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 4, wherein one of said mounting flanges has an outer radius within a range of about 20 to about 21 inches. 9. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 4, wherein one of said mounting flanges has an outer radius within a range of about 23 to about 24 inches. 10. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 4, wherein one of said mounting flanges has an outer radius within a range of about 24 to about 25 inches. 11. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 4, wherein one of said mounting flanges has an outer radius within a range of about 27 to about 28 inches. 12. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 4, wherein one of said mounting flanges has an outer radius within a range of about 29 to about 30 inches. 13. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said mounting flange is substantially cylindrical. 14. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said mounting flange is fabricated from a polymeric material. 15. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 13, wherein said mounting flange further preferably has a thickness that is within a range of about 1/16 inches to about 3/16 inches. 16. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said mounting flange is rectangular in profile. 17. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said trimming step is performed by a manufacturer of said grate adapter unit. 18. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said trimming step is performed by a supplier of said grate adapter unit. 19. A method of mounting a grate adapter unit beneath a stormwater collection grate according to claim 1, wherein said trimming step is performed at a location that is proximate to the stormwater collection grate.