City of Columbia Stormwater Management Land Disturbance Permit Modification Form Department of Utilities & Engineering Stormwater Management Division 1136 Washington Street, 6th Floor Columbia, SC 29201 Phone (803) 545‐3400 ● Fax (803) 988‐8199 Project Name: _________________________________________________________________________ Project City File Number: __________________ SW File Number: ______________________________ NPDES Permit Number (if greater than 1 acre): _______________________________________________ Major Modification(s) ¾ Any modifications that will affect the hydrology or trapping efficiency calculations o Resizing sediment basin or detention basin (for any reason) o Deletion of sediment or detention basin or sediment trap (for any reason) o Relocation of sediment basin or detention basin o Addition of sediment or detention basin o Modification of sediment or detention basin o Modification of sediment or detention basin outlet structure o Amending the construction sequence so that basin is not installed before grubbing operations begin ¾ Point discharge location change (near property line) ¾ Adding a new point discharge (within 20’ of property line) ¾ Addition of impervious area (which will affect curve number calculations) ¾ Addition of disturbed area ¾ Changes to Navigable Water crossing ¾ Addition of any structural sediment and erosion controls (e.g. sediment trap) Minor Modification(s) ¾ Addition of silt fence, slope drains, inlet protection, outlet protection, etc. ¾ Relocation of construction entrance ¾ Relocation of pond inlet pipes (still within the pond) ¾ Omission of disturbed area ¾ Individual lot drainage, unless that changes the detention structure or analysis point to which the lot drains Major modifications will require one set of revised plans, a $100 modification plan review fee and this completed form. Minor modifications, excluding change of ownership, will only require this completed form along with any other revised supporting documents as relevant to the modification (e.g. updated NOI). Please fill out the comment section below and submit with the appropriate documentation for approval. No modifications can be performed in the field until written approval has been given by City Stormwater Management staff. Reason for Modification Submittal: Engineer of Project Record: ___________________________________________________________ Submitted by: ______________________________________________________________________ Date: ____________________________________ Phone: _________________________________ Fax: _____________________________________ Email: __________________________________ Modification Fee $100 Flat Fee for each modification plan review submittal Invoice #: ___________ ATTACH CHECK HERE