LSA Revision Comments Response 1.pdfLovell-Sauerland and Associates, Inc. Phone: 425-775-1591
1921736 th Avenue West, Suite 106 LSAEngineering.com
E N O I N E E R R 1 9 U R V E V O R 9 Z
= — Lynnwood, Washington 98036
Surveyors / Engineers / Planners / Development Consultants
JoAnne Zulauf
Engineer Division
City of Edmonds
Re: PLN20160014, Prospect Lane — 4 lot plat
8713 26t" Street SW, Edmonds
Dear Ms. Zulauf:
November 20, 2017
LSA No. 5601
E, V ,
NOV 212017
DEVELOPMENT S flVIt',EI:
COUNTER
This letter is to address the review comments made by the Mr. Zack Richardson on November
20, 2017. The numbers of the responses (in blue) correspond to the comments on the review. I
will attempt to point out how and where the comments have been addressed on the attached
revised plans and reports.
Review Comments:
The engineer of record shall submit a memo or addendum to the drainage report
demonstrating (with supporting calculations as needed) that the proposed revisions to
the water quality facility will:
a. Provide equivalent level of water quality treatmenYmitigation
The Washington Department of Ecology (DOE) has approved the Stormwater
Biofiltration System with a General Use Level Designation (GULD) for Basic,
Enhanced, and Phosphorus Treatment.
b. Have adequate bypass capacity for the proposed site
The pipe system is capable to convey bypass runoff from the detention vault to
the City's storm drainage system.
c. Will not adversely affect the detention design;
It appears that the proposed system may require more head to push
through the system and the engineer should verify this will not impact
detention flow rates (or state that the proposed system will not back
up more runoff into the control structure).
See Section C — Water Quality Treatment Calculations
2. It appears that the new detail was placed over the previous control structure detail;
restore, at an appropriate location on the plans, all details pertaining to the control
structure and riser.
All details pertaining to the control structure and riser have been restored.
3. Remove note from bid -filtration detail sheet that states "preliminary, not for
construction'; address any other similar notes.
Note has been removed.
Thank you for your time and effort in this review. If you have any questions or need additional
information, please do not hesitate to call.
Jo Yuen