BLD20151312_South_Shore_Retreat_ENG2.pdf
City of EdmondsBLD20151312
TH
121 5AVENUE NORTHEDMONDS, WA 98020 • (425) 771-0220 FAX (425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORK DEPARTMENT
Planning • Building • Engineering
Engineering Plan Review Comments
PermitApplication:Date:
#BLD20151312March 11, 2016
rd
Project Name/Address:
South Shore Retreat -541 3Ave N
Contact Person/Address, Fax or E-mail:
Jacob Strobl –Jacob@strobldesign.com
Reviewer: JENNIFERLAMBERTDivision:
ENGINEERING
During review of the subject submittal, it was found that the following information, corrections, or
clarifications would need to be addressed. All Handouts referred to in these comments canbe accessed at
our website: www.edmondswa.govunder City Government / Development Services Department /
Engineering Division then scroll down to Handouts:
1st Review –12/21/15
nd
2Review –3/11/16
SITE PLAN (A2)
1)As changes are made to other plan sheets, please revise this sheet as needed.
2)OK
3)OK
4)OK
5)OK
6)OK
***Comments provided below will be in a different order than the previous review due to new civil plan
sets being submitted. ***
TESC PLAN (C01)
No Comments
DATE E-MAILED3/11/2016PAGE (1)
City of EdmondsBLD20151312
TH
121 5AVENUE NORTHEDMONDS, WA 98020 • (425) 771-0220 FAX (425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORK DEPARTMENT
Planning • Building • Engineering
Engineering Plan Review Comments
DRAINAGE & UTILITY PLAN (C02)
GENERAL
1)3/11/16–Comment was partially addressed. However, striping will need to be changed due to the
reconfiguration of the driveway. Please show existingstripingverses new striping.
12/21/15 Comment: Show the existing striping along the frontage and where striping will need to be
replaced.
New Comments –3/11/16
2)When you total the impervious surfaces calculations they do not add up to 4,988 sqft. Please
revise accordingly. If the total changes please revise all plans sheets accordingly (including A2).
3)Please do not show the trees that are to be removed. Only show proposed trees or trees that are to
remain.
rd
4)It was recently discovered that concrete exists under 3Ave N. Roadway restoration will be
determined at time of inspection. In previous restorations in this area, the contractor was
required to install nativebackfilland approx. 10”of asphalt.
5)Consistent with our phone conversation, if the utilities are installed as shown on the plans
submitted 1/28/16, a grind and overlay will be required; such that all trenches are captured in one
large patch. I suggest reviewing the utility locations to see if you can combine utility installation to
allow for 1 trench patch within the roadway.
rd
6)Please provide a traffic control plan for the proposed work in 3Ave N.
WATER
1)3/11/16–Comment was addressed. This comment is remaining in case utilities are relocated as
plans are revised.
12/21/15 Comment: Show that there is a minimum of 3’ of horizontal separation between the water and
the dry utilities (i.e. power, phone, gas, cable, etc.). Currently the gas is too close to the proposed water
service line.
2)3/11/16–Comment was addressed. This comment is remaining in case utilities are relocated as
plans are revised.
DATE E-MAILED3/11/2016PAGE (2)
City of EdmondsBLD20151312
TH
121 5AVENUE NORTHEDMONDS, WA 98020 • (425) 771-0220 FAX (425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORK DEPARTMENT
Planning • Building • Engineering
Engineering Plan Review Comments
12/21/15 Comment: Please keep in mind that there is a requirement that there is a minimum of 10’ of
horizontalseparation between the water and the sewer lines.
SEWER
No comments –Please make sure that as changes are made, that the required minimum separation is
being met (3’ from the dry utilities, 10’ from the water,5’ from storm).
STORM
1)3/11/16–Comment was addressed. This comment is remaining in case utilities are relocated as
plans are revised.
12/21/15 Comment: Please provide rim and invert elevations for all catch basins and all pipes.
2)3/11/16–Comment was partially addressed.
a.Confirm that the footing drain flows and yard drains flows are accounted for in the pump
design.
b.If the pump design allows for the connection of groundwater, revise note 3 under the
‘Drainage Notes’ to say “Footing drain and yard drains to discharge to the pump station
(14).
c.If the footing drains and yards drains cannot discharge to the pump station, please show
them discharging to a separate system (i.e. drywell).
12/21/15 Comment: Show where the footing drains will discharge to. If the footing drains are to
discharge to the onsite stormwater management system, please address the allowance for the footing
drains in the design calculations.
New Comments (3/11/16)
3)Revise the notation for the 6” area drain located west of the home to clearly state that it is an
overflow yard drain.
4)Storm lines must be connected at structuresand be completed by the contractor (not the City of
Edmonds). Please showconnection to the existing catch basin. The line may angle as needed.
The catch basin may be located in the curb line of the driveway.
DATE E-MAILED3/11/2016PAGE (3)
City of EdmondsBLD20151312
TH
121 5AVENUE NORTHEDMONDS, WA 98020 • (425) 771-0220 FAX (425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORK DEPARTMENT
Planning • Building • Engineering
Engineering Plan Review Comments
5)Clearly show the location of the alarm for the storm pump. The proposed location (from the
detail on C05) of the alarm shows that the alarm may be easily damaged by vehicles.
Stormwater review comments from Herrera below.
1)The Drainage Narrative (1/25/16) includes detail on Minimum Requirement #3 -Source Control of
Pollutants in Appendix A; however, this minimum requirement is not required for single family
residential sites.
2)On page 3 of the Drainage Narrative (1/25/16), the text for Minimum Requirement #5 states that
LID options were deemed unsuitable due to the requirement for flow control. The intent of LID
BMPs is to provide flow control via infiltration and dispersion. LID BMPs can also be used to help
meet or fully achieve flow control requirements. I would recommend removing this infeasibility
statement. Poor onsite soils from the geotechnical investigation is enough proof that LID BMPs
are not suitable for this site.
3)On page 5 of the Drainage Narrative (1/25/16), the roof area is listed as 0.09 acres; however, the
WWHM report lists 0.08 acres. Please updatefor consistency between the narrative and the model
output report.
4)Page 2 of the WWHM report lists the WWHM version as 2014/04/24. There have been several
model updates since that time. The current version of the model is Version 4.2.11 (2015-11-13):
http://www.ecy.wa.gov/Programs/wq/stormwater/wwhmtraining/index.html.Please revise
accordingly.
5)Terminology in the Drainage Narrative (1/25/16) and plans (Sheet C02) is inconsistent -detention
pipe, detention tank, anddetention system. Please selecta single term (detention pipe) for
consistency throughout the narrative and plans.
6)The Drainage & Utility Plan (Sheet C02, 1/25/16) lists a 4" sediment depth as the maintenance
trigger in Note 4. The actual criteria in Appendix B (O&M) of the Drainage Narrative (1/25/16)
should be calculated as 3.6" for half the length of the pipe or 5.4" at any point.Please revise
accordingly.
7)The Drainage Narrative (1/25/16) states that the 100-year, 24-hour design storm is 40 GPM;
however, based on the value in the WWHM modeling report (0.096554 cfs), this should actually be
43.34 GPM. Please revise accordingly.
8)There is not any discussion on how the pumps will alternate in the Drainage Narrative (1/25/16). If
they both operate on floats, will they both turn on at the same time, or how will they alternate? Is
there a controller? The graph appears to show an option for both pumps to operate at the same
time –is that an intended function? The system curve does not extend far enough to cross the dual
pump curve, but appears that it would cross ~70gpm.
DATE E-MAILED3/11/2016PAGE (4)
City of EdmondsBLD20151312
TH
121 5AVENUE NORTHEDMONDS, WA 98020 • (425) 771-0220 FAX (425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORK DEPARTMENT
Planning • Building • Engineering
Engineering Plan Review Comments
9)The system curve crosses the pump curve at ~50gpm for the HW TDH, and ~45gpm for the LW
TDH in Appendix E of the Drainage Narrative (1/25/16). This is above the 100-yr design flow of
40gpm. Please revise accordingly.
10)The overflow path if the pumps fail is described in the response to comments, but should be added
to the Drainage Narrative (1/25/16) since this does not clearly show up on the plan set and is not
currently discussed in the Drainage Narrative.
DRY UTILITIES
3)3/11/16–Comment was addressed. This comment is remaining in case utilities are relocated as
plans are revised.
12/21/15 Comment: Please show all proposed dry utilities(gas, phone, cable, etc.)on the plans so that
utility separation can be verified. Minimum of 3’ horizontal separation between the dry utilities and
water, sewer, stormis required.
GRADING PLAN & DRIVEWAY PROFILE (C03)
1)The driveway cannot exceed 14% slope (per Edmonds Community and DevelopmentCode
18.80.060). Please revise accordingly.
DETAILS (C04)
No Comment
DETAILS (C05)
1)Pump General Notes
a.Remove note #1 –Storm is not permitted to connect to sewer.
b.Remove note #8 –The pipe must be inspected prior to backfill.
2)Provide float elevations in the detail.
DATE E-MAILED3/11/2016PAGE (5)
City of EdmondsBLD20151312
TH
121 5AVENUE NORTHEDMONDS, WA 98020 • (425) 771-0220 FAX (425) 771-0221
Website: www.edmondswa.gov
PUBLIC WORK DEPARTMENT
Planning • Building • Engineering
Engineering Plan Review Comments
3)The detail for the pump system states that the alarm is shown on C04; however, this sheet is for
details. Should this be revised to say sheet C02? Please revise the note accordingly.
4)Please revise the pump station details to be consistent with the City’s stormwater pump policy and
Standard detail E6.7 (Sewer grinder pump). For example, show antiflotation devices, rails, vent,
etc. Make sure that the design shows that they system can be maintained (for example the
standard detail E6.7 shows that the entire lid can be removed for a maintenance where a manhole
lid does not allow for this.
5)Please provide approx. pipe lengths, types, sizes, etc. to the pump details.
DETAILS (C06)
No Comment
Please resubmit 3 copies of the revised plansand associated documents with a written response to each
item to a Permit Coordinator. Please contact me at 425-771-0220ext 1321or by e-mail at
jennifer.lambert@edmondswa.govif you have specific questions regarding these plan corrections.
DATE E-MAILED3/11/2016PAGE (6)