Response to ENG & Storm.pdf1 �roe
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ENGINEERS / SURVEYORS / PLANNERS / DEVELOPMENT CONSULTANTS
RESUB
OCT 3 0 20V
BUILDING DEPARTMENT
October 30, 2017
City of Edmonds
CITY OF EDWW)NDS LSA File No. 5459
121 5th Avenue N.
Edmonds, Washington 98020
TO: JoAnne Zulauf, Engineering Technician — Engineering Division
Re: City of Edmonds Application # bld20161389
Dear JoAnne,
As requested, please find attached, the revised Declaration of Covenant — Private Stormwater Facility.
The following comments of your letter dated July 31, 2017, are addressed as follows:
Item 1 A covenant document has been prepared and 2 copies are included in this submittal.
Item 2 The "Infiltration Trench" box has been checked.
Item 3 Exhibit A for the legal description and Exhibit B for the map are prepared to Snohomish County
recording requirements.
Item 4 The map on Exhibit B reflects the entire building lot for Tax Parcel No. 00544300001802. Two
infiltration trenches are shown in their proposed locations with construction data.
Item 5 All construction notes and callouts are prepared at an 8 point font and are clearly readable.
Item 6 All information not pertinent to the bmp has been removed.
Should you have any additional questions or comments, please contact me.
Sincerely,
KeN A-Wc�&
Kelly A. Mitchell
Plat Coordinator
Love] l-Saueriand & Associates, Inc.
19217 36th Ave. W., Suite 106, Lynnwood, WA 98036 425-775-1591 LSAengineering.com
c Lovell-Sauerland and Associates, Inc. Phone: 425-775-1591
GibEN L- A Z 19217 3611' Avenue West, Suite 106 LSAEngineering.com
Lynnwood, Washington 98036
Surveyors / Engineers / Planners / Development Consultants
JoAnne Zulauf October 27, 2017
Engineer Division LSA No. 5459
City of Edmonds
Re: Tiersma Short Plat — Single Family Residence (Lot 2) OCT 3 0 2Q11
22318 - 92"d Avenue W, Edmonds
Application #: BLD20161389 BUILDING DEPARTMENT
CITY OF EDMONDS
Dear Ms. Zulauf:
This letter is to address the review comments made by Mr. Robert Edwards on July 19, 2017.
The numbers of the responses 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.
Minimum Requirement #1 — Preparation of Stormwater Site Plan
1. Sheet C3: Infiltration trench detail has been revised.
2. Two additional exploration pits were completed at the subject location. EP-3 and EP-4
were excavated to depth of 15 feet and 10 feet, respectively. Per the Textural Triangle
Results prepared by Battermann Geotechnical Consulting, PLLC, dated October 24,
2107 (attached), the long term infiltration rates based on the USDA Textural
Classification at EP-3 and EP-4 would be 0.5 inches per hour. Originally, long term
infiltration rate of 2.0 inches per hour was used in the calculations to size the dry well
at EP-3. The new required drywell area with sizing factor of 4.8% would be 127.44
square feet, which is equivalent to 12.74 feet in diameter. Due to the site constraints,
the new drywell size of 12.74 feet in diameter does not meet the setback requirements.
Therefore, infiltration trench (3 foot depth) is proposed in lieu of drywell at EP-3.
Minimum Requirement #2 — Construction Stormwater Pollution Plan
1. Sheet C2: Construction Entrance with detail has been added.
2. The CESCL information has been revised.
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.
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