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City of Edmonds''''
22 2014
Site Classification Worksheet LOPME T SERVICE
COUNTER
Page 1 of 2n� 'as�
The project's Site Classification will dictate the specific stormwater management
requirements applicable to your site. Completing this worksheet will help determine the amount of
regulated impervious surface and whether your project falls into the classification of a Small Site
(Category 1 or Category 2), or a Minor Site. pleasereference the !Q1gssaa ( .. 1O-1 1" Figures D and
Em. 8-9). and. Examples Q)p, I I - 121, to assist with completion of this worksheet.
1) Is Permeable Pavement' Proposed For Use on this Site? ❑ Yes No
Refer to Stormwater Supplement Chapter 5.1
If YES, the subject area is to be considered impervious for initial site classification purposes. Include total
permeable pavement area in the calculation of Non -Regulated, Replaced and/or New impervious surface
areas in the table below.
2) Determine the Amount and Type of Existing & Proposed Impervious Surface for the Site
Refer to Stormwater Supplement Chapter 2 and Fig. C
Line 1: Identify the Non -Regulated Impervious Surface Area.
Line 2: Identify the Replaced Impervious Surface Area, dividing the total between Exempt and Regulated; either or both
may be zero. Note: For project classification purposes, Replaced Impervious may only be considered exempt
under certain conditions. Refer to the Glossary and Figure D.
Line 3: Identify the New Impervious Surface Area for your project. All impervious areas created post -July 7, 1977 or
after the date of annexation into the City are regulated & should be included in this total unless they can be
categorized separately as a Replaced -Regulated area.
Line 4: Enter the sum of the total Replaced -Regulated plus the total New impervious areas.
Line 5: Identify the total area currently mitigated by an existing city -approved stormwater management system.
Line 6: Enter the sum of the value in Line 4 less the value in Line 5 to identify the total Regulated area in which
stormwater controls have not yet been applied.
Line 7: Identify the total area proposed to be mitigated through the use of Low Impact Development Techniques.
Line 8: Identify the total area proposed to be mitigated through conventional Stormwater Management Techniques.
** Provide a copy of the following table on the drainage plan sheet for the proposed project **
Line Type Area (square feet)
1.
70
Non-Regulated
Exempt � Regulated
2. Replaced ".73,
3. New (Post 1977) 4 4 4 i 1196-7
I U V I. , , r , „ . I u_ , , 11, .n , "'.ti � �z
4. Total Regulated Impervious Area
Mitigation required if in excess of 2000sf
5. Total Area Mitigated by Existing Stormwater Management System(s) -
6. Regulated Area Not Yet Mitigated
7, Area Proposed to be Mitigated by Low Impact Development Techniques =
8. Area Proposed to be Mitigated through Conventional SWM Techniques
t (e.g. porous asphalt, porous concrete, paver blocks, concrete open celled paving grids, or plastic lattices filled with turf or stone)
Revised on 310512012 E72-SWM_Erosion_Control-03.05.12.doc Page 5 of 12