20140624092802555.pdfMay 27, 2013
Attw JoAnne ZulaLif
City of Edmonds — Engineering Division
121 5"' Avenue North
Edmonds, WA 98020
Re: Multi -family Housing Project (BLD 20140299)
23220 Edmonds Way, Edmonds, WA
Dear JoAnne,
WEB Engineering Ltd (WEB) has prepared this letter to summarize project issues / design changes (pertaining to
civil) per City staff review comments letter dated April 22, 2014. A copy of the staff letter is attached for
reference.
General Comments
Comment # 1: Please make corrections on all page notes that refer to ".Snohomish County" to "Edmonds" and
where "county" to "city". All standard details shall be City of Edmonds details. Please revise all sheets as
necessary.
® All sheets have been revised as requested.
Comment # 2: Notes and standard details are included in these sheets that are not referencing the construction of
this project. Please revise and remove all that are not applicable.
® All sheets have been revised as requested.
Comment # 3: Please provide a Traffic Control plan. Plan should be approved and signed by WSDOT.
® Traffic control plan is attached as requested. Per our recent discussion, WSDOT approval is not
necessary.
Comment 94: Please provide a Striping/Signage Plan including Fire Department requirements. .Include City of
Edmonds Standard Details.
Per our recent discussion, it is sufficient to note locations of on-site curbing to be painted red and sign
locations stating "No Parking — Fire Lane" (See sheet C-03).
Comment #5: Please provide sheets G8 and C-12 with Olympic View Water and Seiver District approval and
signature.
IN OV WS District staff has reviewed and indicated approved of the civil design plans, however formal
approval and signature is forthcoming per the Developer Extension Contract process. Please contact
OVWS District (Marty Henninger at Ph 425-774-7769) confirming water and sewer design review.
125 West Kellogg Road, Bellingham, WA 98226 Tel: (360) 671-7002
May 27, 2014
Edmonds Way Multi -Family Housing Project (BLD 20140299), Edmonds, WA
Sheet C-3 Horizontal Control
Comment #6: Please provide top and toe elevations for the landscape wall on this sheet.
® Per our recent discussion, retaining wall elevations are provided on the Grading plan (Sheet C-4) and it
was agreed that it is not necessary to provide wall elevations on the Horizontal Control plan.
Comment 97: Sidewalk shall extend to property line. Please show sidewalks to property line and add note
"Transition to existing conditions shall be made at point where slopes and adjoining conditions allow. "
® The sidewalk extents have been modified with note to clarify as requested.
Comment #8: "Proposed Access and Utility Easement" along frontage of property is intended for Olympic View
Water Sewer District? Please clam.
Per our recent discussion, this easement has been revised as required to accommodate the proposed
sidewalk alignment encroachment (per Architecture Design Board condition of approval to have sidewalk
offset 4 ft from the roadway). A separate storm water maintenance access easement is also now proposed
as you requested. Draft easement documents are attached for your review, and will be recorded with
separate Auditor File Numbers (AF #) upon your approval.
Civil utility easements (water service meters and power) will also be prepared and recorded as required by
the utility company requirements.
Comment 99: Easements to the City need to go through Council for approval. Please submit as soon as possible
to ensure this process can be completed as soon as possible.
® Per our recent discussion, we understand easement exhibits require City review, approval and recording
prior to permit issuance approval.
Comment #10: As easement is also required for City operations crews to access the stormwater system for
compliance inspections. Please provide document and show location of easement on plans
® Per comment 8 above, we understand a stormwater access easement also requires City review, approval
and recording prior to permit issuance approval.
Sheet C-4 Grading and TESC
Comment #I1: Revise all notes as requested in comment 91.
® All notes have been revised as requested.
Comment #12: Revise note #16 to reference DOE BMP T5.13.
® Note 16 revised as requested.
Comment #13: Note #2 in lower right corner of sheet should read sheet C-1, not C-9 for the locations of General
Notes.
® Note 2 revised as requested.
WEB Engineering Ltd 2 Project: 09188
May 27, 2014
Edmonds Way Multi -Family Housing Project (BLD 20140299), Edmonds, WA
Sheet C-5 Road and Drainage
Comment 914: Replace Flow Control detail and Pavement section detail with City of Edmonds details
® Replace Flow Control detail revised as requested.
® As discussed, additional pavement section detail is not required.
Sheet C-9 Standard Dotes and Details
Comment #I5: Replace City of Bellingham standard details with City of Edmonds details.
® Details revised as requested.
Comment #16: Road Notes and Storm Drainage Notes are largely not consistent with City of Edmonds Standard
Details and Material Mods. Please remove these sections or revise to reference COE requirements.
® Notes deleted as requested.
Sheet C-10 Standard Details
Comment #17: Remove WSDOT standard detail for Type 2 manhole. Replace with COE detail.
® Detail revised as requested.
Sheet C-11 Standard Notes and Details
Comment #18: This sheet includes details not consistent with COE details, details that are not used in the plans
or details that are already located on other sheets. Please remove to reduce confusion. If there is one here that
applies to something, please reference where it applies.
® Flow Control Manhole Detail revised as requested to reference COE. Other project details that remain
that are not COE details but are required for the design.
Traffic Impact Analysis Worksheet
Comment #19: The prior use (210) Single Family rate was taken from the 2009 rate table instead of the 2004 rate
table provided. Please revise the per unit rate for the prior use to $840.72. See handout E82 for more
information.
® We understand this comment will be addressed by City Staff (FYI comment only).
Storm`vater Report and Plan Review
Comment 1: Section 2.3 - The report correctly classifies the site as a Category 2 Small Site Project. The report
does not, however, list all the Small Site Minimum Requirements that apply to the project and how the design
meets these minimum requirements. See Edmonds Community Development Code (ECDC) Chapter
18.30.060.D.2. b and Section S of the Edmonds Stormwater Code Supplement). The document should be
organized to speak to all the applicable Small Site Minimum Requirements.
® The stormwater report narrative has been revised to specifically address all the applicable Small Site
Minimum Requirements.
WEB Engineering Ltd 3 Project: 09188
May 27, 2014
Edmonds Way Multi -Family Housing Project (BLD 20140299), Edmonds, WA
Continent 2: Section 4.3.land Appendix 3 —The project uses ChamberMaxx detention chambers for storage. The
"Storm Detention Chamber Volume Summary (Cross-section Calc) " in Appendix 3 uses a chamber volume of
7.94 cubic feet per lineal foot of chamber (cf/jo in the calculation. Information obtained by the reviewer form the
manufacturer's website indicated the chambers range from 6.5 to 6.9 cf/lf (see enclosed). If the designer is using
a different chamber that has 7.94 cf/lf please provide the cut sheet. If the designer is using the Chambermaxx
model in the enclosed cut sheet, rnodify the modeling and the design accordingly.
■ The 7.94 cf/fl value was based on the actual cross section end area of the Chambermaxx unit (CAD detail
drawing obtained from the manufacture). The stormwater modeling has been revised based on 6.75 cf/lf
(pro -rated per 6.5 and 6.9 cf/lf based on actual chamber configuration) as requested.
Comment 3: Appendix 3 — The "Effective Depth" parameter in WWHM3 for detention systems should be the live
storage plus ]foot of freeboard above the top of the riser. In this configuration, the value should be 3.5 feet
instead of 3 feet.
■ The stormwater modeling effective depth has been revised to 3.5 ft as noted.
Comment 4: Appendix 3 —The modeling uses a 10 inch diameter riser pipe in the detention outlet structure. The
"Flow Control Manhole Detail" on Drawing C-5 shows a 12 inch diameter riser pipe. Also, the modeling shows
that the outlet structure for the detention system has notch height of ]foot and notch width of 0.08 feet. The
"Flow Control Manhole Detail " on Drawing C-5 shows has notch height of 0. 08feet and notch width of I foot.
Please reconcile these inconsistencies. Also, the City of Edmonds has its own standard detail for control
structures that does not use a shear gate. Please include.
■ The riser diameter and notch detail has been revised as noted.
■ COE flow control manhole detail is now referenced as noted.
Comment 5: Section 4.3.3 - The design proposes linear sand filter for treating the runoff from the pollution
generating impervious surfaces. Ecology's 2005 and 2012 Stormwater Management Manual for Western
Washington (SWMMWW)state for sand filters: "Do NOT place upstream of a detention facility. In order to
prevent exposure of the sandfilter surface to high flow rates that could cause loss of media andpreviously
removed pollutants, "(Section 8.6). Also, a pre -settling chamber is not included in the design (the proposed I
foot by 1 foot catch basin is not sufficient). Section 8.2, Volume V of Ecology's 2005 SWMMWW requires the use
of a pre-setting system upstream of a sand filter .
Per recent discussion with Mr. Shuster, the proposed sand filter location situated prior to detention is
acceptable (flows to the sand filter are characterized as low flow rate / very low velocity based on
pavement runoff only from the pre -settling basin). Rooftop non pollutant generating runoff flows
completely bypass the sand filter. Moreover, there is minimal risk of exposing the sand filter to high flow
rates that could cause loss of media and previously removed pollutants as noted.
Plans revised to provide a Type 1 P catch basin with an inverted tee per WSDOE best management
practices. This type of structure is commonly used for satisfying the pre -settling requirement.
Comment 6: Sand filters must be set back at least 5 feet from property lines.
■ Per recent discussion with Mr. Shuster, the proposed sand filter location setback from the property line is
acceptable since the basin is proposed to include an impermeable liner system to ensure no stormwater
can infiltrate to the soils to adversely affect the adjacent property.
WEB Engineering Ltd 4 Project: 09188
May 27, 2014
Edmonds Way ]Multi -Family Housing Project (BLD 20140299), Edmonds, CdA
Comment 7: Drawing C-6 — "Sand filter and Detention Profile " — this provides an elevation for° the bottom of
the "base of the chambers. " Clarify whether its elevation is actual bottom of the chamber or the bottorn of 6"
rock layer below the chambers.
El Additional elevation callouts have been added to the detention profile to clarify the design as requested.
If you have any questions or comments, please do not hesitate to contact me at (360) 671-7002. I can also be reached
directly on my mobile phone at (360) 927-9525.
Sincerely,
PUT
Neil Latta, P.E.
Attachments
WEB Engineering Ltd 5 Project: 09188
City of Edmonds
1215TH AVENUE NORTH a EDMONDS, WA 98020 e (425) 771-0220 FAX(425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORKS DEPARTMENT
Engineering Division
Plan Check #: BLD20140299 Date: April 22, 2014
Project Name/Address: Kautz Route LLC Multi Family 23220 Edmonds Way
Contact Person/Address/Fax: Steve Price SPRICE@RERESOURCES.COM
Reviewer: JoAnne Zulauf Division: Engineering
During review of the subject submittal, it was found that the following information, corrections, or
clarifications would need to be addressed. All Handouts and Standard Details referred to in these
comments can be accessed at our website: www.edmondswa.ov by choosing Permit Assistance:
General Comments - This review is of the proposed civil improvements to the property.
1. Please make corrections on all page notes that refer to "Snohomish County" to "Edmonds" and
where "county" to "city". All standard details shall be City of Edmonds details. Please revise all
sheets as necessary.
2. Notes and standard details are included in these sheets that are not referencing the
construction of this project. Please revise and remove all that are not applicable.
3. Please provide a Traffic Control plan. Plan should be approved and signed by WSDOT.
4. Please provide a Striping/Signage Plan including Fire Department requirements. Include City
of Edmonds Standard Details.
5. Please provide sheets C-8 and C-12 with Olympic View Water and Sewer District approval and
signature.
Sheet C-3 Horizontal Control
6. Please provide top and toe elevations for the landscape wall on this sheet.
7. Sidewalk shall extend to property line. Please show sidewalks to property line and add note
"Transition to existing conditions shall be made at point where slopes and adjoining conditions
allow."
8. "Proposed Access and Utility Easement" along frontage of property is intended for Olympic
View Water Sewer District? Please clarify.
9. Easements to the City need to go through Council for approval. Please submit as soon as
possible to ensure this process can be completed as soon as possible.
10. As easement is also required for City operations crews to access the stormwater system for
compliance inspections. Please provide document and show location of easement on plans.
Sheet C-4 Grading and TESC
DATE FAXED/E-MAILED 4/23/2014 PAGE 1 of 3
11. Revise all notes as requested in comment #1.
12. Revise note #16 to reference DOE BMP T5.13
13. Note #2 in lower right corner of sheet should read sheet C-1, not C-9 for the locations of
General Notes.
Sheet C-5 Road and Drainage
14. Replace Flow Control detail and Pavement section detail with City of Edmonds details.
Sheet C-9 Standard Notes and Details
15. Replace City of Bellingham standard details with City of Edmonds details.
16. Road Notes and Storm Drainage Notes are largely not consistent with City of Edmonds
Standard Details and Material Mods. Please remove these sections or revise to reference
COE requirements.
Sheet C-10 Standard Details
17. Remove WSDOT standard detail for Type 2 manhole. Replace with COE detail.
Sheet C-11 Standard Notes and Details
18.This sheet includes details not consistent with COE details, details that are not used in the
plans or details that are already located on other sheets. Please remove to reduce confusion.
If there is one here that applies to something, please reference where it applies.
Traffic Impact Analysis Worksheet
19.The prior use (210) Single Family rate was taken from the 2009 rate table instead of the 2004
rate table provided. Please revise the per unit rate for the prior use to $840.72. See handout
E82 for more information.
Stormwater Report and Plan Review
For this application I reviewed the following:
® Stormwater Site Plan Report, Edmonds Way Multifamily Development, 23220 Edmonds Way, Edmonds Washington.
Prepared by Web Engineering, Revision 2, February 14, 2014.
® Drawings C-5, C-6, & C-7.
1. Stormwater Site Plan Report —
® Section 2.3 - The report correctly classifies the site as a Category 2 Small Site Project. The report does not, however, list all
the Small Site Minimum Requirements that apply to the project and how the design meets these minimum requirements. See
Edmonds Community Development Code (ECDC) Chapter 18.30.060.D.2.b and Section 5 of the Edmonds Stormwater Code
Supplement
(http://www.edinondswa.gov/images/COE/Government/Departinents[Public Works/Stormwater Utility//pdf/EdmondsStorm
waterSupplementFinal20100428.pddf). The document should be organized to speak to all the applicable Small Site Minimum
Requirements.
® Section 4.3.1 and Appendix 3 — The project uses ChamberMaxx detention chambers for storage. The "Storm Detention
Chamber Volume Summary (Cross-section Calc)" in Appendix 3 uses an chamber volume of 7.94 cubic feet per lineal foot
DATE FAXED/E-MAILED 4/23/2014 PAGE 2 OF 3
of chamber (cf/lf) in the calculation. Information obtained by the reviewer form the manufacturer's website
(http://www.conteches.con/)esktopMoclules/Bring2mincl/DMX/Download.aspx?Command=Core Download&EntryId=275
7&PortalId=O&Tabid=144) indicated the chambers range from 6.5 to 6.9 cf/lf (see enclosed). If the designer is using a
different chamber that has 7.94 cf/If please provide the cut sheet. If the designer is using the Chambermaxx model in the
enclosed cut sheet, modify the modeling and the design accordingly.
a. Appendix 3 — The "Effective Depth" parameter in WWHM3 for detention systems should be the live storage plus 1
foot of freeboard above the top of the riser. In this configuration, the value should be 3.5 feet instead of 3 feet.
b. Appendix 3 —The modeling uses a 10 inch diameter riser pipe in the detention outlet structure. The "Flow Control
Manhole Detail" on Drawing C-5 shows a 12 inch diameter riser pipe. Also, the modeling shows that the outlet
structure for the detention system has notch height of 1 foot and notch width of 0.08 feet. The "Flow Control
Manhole Detail" on Drawing C-5 shows has notch height of 0.08 feet and notch width of 1 foot. Please reconcile
these inconsistencies. Also, the City of Edmonds has its own standard detail for control structures that does not use
a shear gate. Please include.
(http://e(finondswa.gov/images/COE/Services/Permits and Development/Standard Details/Storm Drainage/E5-
4 FLOW CONTROL STRUCTURE.pdt).
Section 4.3.3 - The design proposes linear sand filter for treating the runoff from the pollution generating impervious
surfaces. Ecology's 2005 and 2012 Stonnivater Management Manual for Western Washington (SWMMWW)state for sand
filters: "Do NOT place upstream of a detention facility. In order to prevent exposure of the sand filter surface
to high flow rates that could cause loss of media and previously removed pollutants," (Section 8.6). Also, a
pre -settling chamber is not included in the design (the proposed 1 foot by 1 foot catch basin is not sufficient). Section 8.2,
Volume V of Ecology's 2005 SWMMWW requires the use of a pre-setting system upstream of a sand filter.
Figure 8.7 in the 2005 SWMMWW provides an example of a linear sand filter with a sediment chamber. While the 2005
SWMMWW does not provide criteria for pre -settling, the 2009 King County Surface Water Design Manual does. It states
that the pre -settling goal is to remove 50 percent of the total suspended solids and suggests some options. (Section 6.5.1).
Also, sand filters must be set back at least 5 feet from property lines.
Other options are available for the project to meet the basic treatment requirement beside a linear sand filter. The City of
Edmonds accepts the use of "General Use —approved" technologies by Ecology.
2. Drawings
® C-6 — "Sand Filter and Detention Profile" — this provides an elevation for the bottom of the "base of the chambers." Clarify
whether tis elevation is actual bottom of the chamber or the bottom of 6" rock layer below the chambers.
Sincerely,
Jerry Shuster, P.E.
Stormwater Engineering Program Manager
erry.Shuster@edmondswa.gov
425-771-0220 x1323
Please resubmit 3 copies of the revised plans/documents to a Development Services Coordinator. Please
contact me at 425-771-0220 if you have specific questions regarding these plan corrections.
DATE FAXED/E-MAILED 4/23/2014 PAGE 3 OF 3