1438_001.pdfMAC ENGINEERING RESPONSES, June 13,2Ot9
STORMWATER REVIEW COM M ENTS
City of Edmonds
Engineering Division¿c. 18
To:
Date:
Project Name:
Permit Number:
Address:
Review Type:
Submittal Date:
Reviewer:
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Applicant
May 10,2At9
Hicks Family Trust
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Building Permit (SFR)
4/30/2019
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ZackRichardson, PE
City of Edmonds, Stormwater Engineer
Recommendation: I recommend that 8LD20181267 be withheld until the comments
below are adequately addressed.
It has become apparent that the site grading plan is not based on accurate or reliable
data. Site specific information is required before the plans can be approved. Looking
closer, it appears that the City's general GIS information has been used for site design;
the Cþ's GIS page specifically includes the following language to make clear that this is
not adequate information for design: By clicking OK below you acknowledge the
following: This information is supplied for reference puq)oses only and should not be
relied upon for the actual location of City facilities or of final critical areas designations.
THE CITY OF EDMONDS MAKES NO WARR.ANTIES, INCLUDING ANY WARRANTY
AS TO FITNESS FOR A PARTICULAR PURPOSE EITHER Ð(PRESS, IMPLIED, OR
STATUTORY, WITH RESPECT TO TI{E DATA. You must obtain independent
verification of the information. The City of Edmonds or its employees shall not be liable
for the information. Neither this map or the information contained within may be used for
commercial purposes. A SURVEY HAS BEEN COMPLETED AND USED FOR
DESIGN.
Review Comments:
Update plans to include reliable site specific existing edge conditions, to state where the
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MAC ENGINEERING RESPONSES, June t3,20L9
topo/edge infomration came from, and to address the remaining review comments
which could not have been adequately addressed without such information.
1. Show & confirm that the vegetated flow path does not exceed maximum slope
requirements. PER THE PROPOSED GRADfNG PLAN, THE MAXIMUM
SLOPE OF TI'TE VEGETATED FLOW PATH IS <15%.
2. Show & confirm that driveway grading does not exceed the maximum slope
and is graded to drains as intended PER THE PROPOSED GRADING
PLAN, NO PORTION OF THE DRIVEWAY EXCEEDS 14o/o AND THE
DRIVEWAY IS GRADED TO DRAINS.
3" Provide top/finished grade and invert elevations for the dispersion trenches. THE
TOP OF GRADE BOARD ELEVATIONS AND INVERT ELEVATIONS HAVE
BEEN PROVIDED IN THE PROPOSED GRADING AND DRAINAGE PLAN.
4. Identifu location where footing drains will outlet; if they outlet to the dispersion
trench system, provide enough information to veriff that the footing drains maintain
a minimum freeboard above the top of the dispersion trench to avoid backwatering.
PER THE PROPOSED GRADING AND DRAINAGE PLAN, THE LOCATIONS
OF FOOTING DRAINS HAVE BEEN IDENTIFIED AND INVERT
ELEVATIONS PROVIDED. THE FOOTING DRAIN INVERTS ARE AT A
GREATER ELEVATION THAN THE DTSPERSION TRENCH GRADE BOARD
ELEVATIONS.
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