Instructions for NPDES Summary Form
Proposed Condition Date – The date of final submission during the SWM and ESC plans review.
As-built Condition Date – The date of submission of the As-built plans.
ESD Number – SWM and ESC Plan tracking number which is assigned by DPW when the concept is submitted.
Plan Number – Permit Application Plan # which is assigned by the Dept. of Housing.
Permit Number - Permit # which is assigned by the Dept. of Housing.
Ward Number – City electoral district in which the property is located, available from Maryland Real Property Search, at website address http://sdatcert3.resiusa.org/rp_rewrite/.
Section Number - Part of property legal description, available from Maryland Real Property Search.
Block Number - Part of property legal description, available from Maryland Real Property Search.
Lot Number - Part of property legal description, available from Maryland Real Property Search.
Watershed – A drop down menu of the MDE 8 digit watersheds which drain the city, the choices are the Gwynns Falls, Jones Falls, Back River which includes Herring Run, Baltimore Harbor, or Patapsco River. If project is in more than one watershed fell out the other watershed drop down location.
Project & Contact and Property Owner Information
Project Information – Is the project name and address. The name and address of the project should match the name in title block of the SWM and ESC plans.
Contact Name – The name of the person who the city should contact about the site and right of entire to the site. Give the first and last name, phone number, and email address.
Property Use (Land Use) - This is a drop down menu; see the MDE Landuse attachment for more details on each Landuses.
Construction Purpose – This is a drop down menu of the construction types, the choices are New Development, Re-Development, and Restoration. New Development covers projects in which proposed development is happening on a site which is less than 40% existing impervious. Re-Development covers projects in which proposed development is happening on a site which is greater than or equal to 40% existing impervious. Restoration covers projects in which the development is only to improve the sites hydrologic and hydraulic runoff characteristics.
Property Owner Information – The owner’s name, address, phone #, and email. If the project and contact information (see above) is the same, just check the box the leave the rest of this section blank. Otherwise, fill in the information.
Development Information
Total Property Area (ac) – Area of the tax parcel where the work is happening.
Total LOD (ac) – Limits of Disturbance, LOD, is the area where work could disturb sediment.
LOD (WQ Review) (ac) – Limits of Disturbance which is being treated for stormwater runoff.
Existing Impervious Area (ac) – Area of impervious within the limit disturbance before construction takes place.
Proposed Impervious Area (ac) – Area of impervious within the limit of disturbance after construction takes place.
Net Change in Impervious Area (ac) – The existing impervious area minus the proposed impervious area. If the number is negative then there is a reduction, and if positive there is a gain.
Impervious Area Requiring Treatment (ac) – The area of impervious landcover which requires the runoff to be treated for this project.
Treatment Provided On-Site (ac) – What is the impervious treatment being provided from the site.
Treatment Provided Off-Site (ac) – What is the impervious treatment being provided from areas off of the site.
Remaining Impervious Area Untreated (ac) – What is the impervious area on the site which is not drainage to a treatment structure.
Existing RCN – The Runoff Curve Number of the project site prior to the construction on the site.
Proposed RCN – The Runoff Curve Number of the project site after the project site is developed.
Direct Discharge – Does the project site discharge into a public storm sewer, tidal waters, or other controlling system.
Alternative BMPs - If Structural or ESD BMP does not work on the site alternative methods can be used. Check off the alternative methods which the project will be doing. Since these methods are not normally implemented, give the equivalents impervious area treated and/or estimate nitrogen and phosphorous removal for the alternative method.
Waiver and Variances – If the project is going for any waivers and/or variances fill out the table with: which waivers and/or variances are being requested, if the reviewer granted the request, the basis for the waiver and /or variance, and what is being done for the waiver and/or variance.
Fee-in-lieu- For all fee-in-lieus, give the watershed which the payment will be happening and unit rate and amount that is agreed to for the project.
Asbuilts – This form has to be filled out again to address all changes which happen during construction. Also the following information needs to be added to the form: plan approval, construction start, construction completion, and modification dates.
Drainage area boundary and tree planting boundary file in digital format – please include a filed in your submission that outlines the drainage area boundary of this BMP. Coordinates should be in NAD 83 Maryland State Plane coordinates. Do not send an entire drawing or plan; just send the delineated drainage area. Acceptable formats are dwg, shp, dgn, or dxf files. If none of these can be supplied, send an ASCII text file with a series of coordinates.
easting1, northing1
easting2, northing2
easting3, northing3
. .
etc.
.PDF of BMP Plan and detail sheets provided – include pdf files of the stormwater management plans for the project and check this box. All the BMPs will be on the same set of plans typically.
General Comment – If the form does not address something please address in general comments.
Structural and ESD BMP Summary Table – Is a table which has to be on all SWM approved plansets. The table is made up of the information listed below.
Water Quality Volume, WQV (cf) – enter the volume of water treated by the BMP calculated according to the Maryland Design Manual. If your calculations are done in terms of PE convert the inches into a volume (ESDv) by ESDv = (PE)(Rv)(A)/12 where PE is the precipitation treated in inches calculated according to the Maryland Design Manual, Rv is the runoff coefficient, A is the drainage area to the BMP in square feet.
Recharge Volume, REV (cf) – Enter the volume of water recharge into the groundwater by the BMP according to the Maryland Design Manual.
Channel Protection Volume, CPV (cf) – this is the volume retained on-site to control the one-year 24 hr storm. For some ESD practices, this will be zero. If the BMP provides both Water Quality Volume and Channel Protection Volume, enter only the portion above the Water Quality Volume requirement, i.e. subtract the Water Quality Volume (resulting from one inch of precipitation) from the total BMP volume.
Qpeak 10 (cfs) – enter the 10-year peak flow from the site
Qpeak 100 (cfs) – enter the 100-year peak flow from the site
Facility Information
Structure ID – A unique number is necessary for each BMP on the site. This number should be formed from the project ESD Number with sequential numbers, for example, for ESD # 8903, the first BMP would be BC8903-1, the second BMP would be BC8903-2, etc. If this is a redevelopment project and you are taking credit for previously installed BMPs in good condition, use the original number. If you do not know the original number, call the Surface Water Division.
Structure Name – If another identification method is also being given to the BMP then place in the box. Otherwise leave the box blank.
Structure Type – This is a drop down menu – select the BMP, if not on the menu, select OTHER.
Northing, Easting – enter the NAD 83 Maryland State Plane coordinates at downstream end (discharge point) of the BMP.
Are Structure’s in series? – There may be multiple BMPs with overlapping drainage areas, if so check the yes box and enter the Structure ID of the upstream BMP and/or the Structure ID of the downstream BMP.
Drainage Area to Structure (ac) – Enter the drainage area to this Structure.
Impervious Surface of Drainage Area (ac) – Enter the impervious acreage in this Structure’s drainage area.
Treated Impervious Area (ac) – Enter the actual impervious acreage in the Structure’s drainage area that is being treated.
Urban Tree Planting and Forestation Efforts – If the alternative tree planting method is being used fill out this page for all areas and/or street trees. If more locations are required just reuse the page.
Proposed Tree Canopy (ac) – a tree canopy acre shall be equal to or greater than 100 tree that are 2 inches in diameter or greater at 4 ½ feet above ground level.
Responsible Party – If there are issues with the plantings the responsible person or party that shall maintain or replant the proposed trees. Give the contacts name, phone number, email, and address.