Engineering and Storm Comments 2-PLN20180028-Trang.pdfof EDV0 CITY OF EDMONDS
CIVIL PLAN REVIEW COMMENTS
ENGINEERING DIVISION
6'st 1 g90 (425) 771-0220
City Website: www.edmondswa.gov
DATE: June 14, 2019
TO: John Trang, T & D General Construction
johntrang20l2@yahoo.com
FROM: Jeanie McConnell, Engineering Program Manager
jeanie.mcconnell@edmondswa.gov
RE: Subdivision File 4: p1n20180028
Project: Trang — 2 lot SP
Project Address: 23135 - 75th PI W
During review of the above noted application, it was found that the following information,
corrections, or clarifications are needed. Please redline plans or submit two (2) sets of revised
plans/documents with a written response to each of the items below to an engineering technician.
Resubmittals can be made at the Development Services Department on the 2nd floor of City Hall.
Permit Center hours are M, T, Th & F from 8am-4:30pm and on Wednesdays from 8:30am-noon.
City of Edmonds handouts, standard details and development code can be referenced on the City
website.
Comments 1 — February 12, 2019
Comments 2 — June 14, 2019
GENF,R A L
June 14, 2019 — Thank you for providing the requested bond quantity worksheet. Please
revise as follows:
• Revise ESC to include catch basin Filter socks (at least 1 will be required downslope of
the site on 75th Pl W)
• Please include water main couplings, tees, caps, thrust blocking, etc.
2/12/2019 comment - Please provide an itemized engineers cost estimate for both on -site and
off -site (right-of-way) improvements, including all utilities, traffic control, and
restoration/enhancement plantings. Use the King County Site Improvement Bond Quantity
Worksheet and utilize the "write-in" sections where appropriate.
• At a minimum, a bond is required to be placed for all erosion control measures and right-of-
way improvements.
• Please note, if you intend to post a bond in order to record the subdivision and ahead of
constructing the required improvements, the bond amount shall be based on the entire scope
of the project.
• The amount of the bond will be based on 120% of the City approved estimate. The City will
inform you of the appropriate bond amount after review of the cost estimate. Please obtain
the appropriate subdivision improvement bond forms from the City available on the City
website.
• Inspection fees for this project will be calculated at 3.3% of the 100% City approved
estimate for all improvements.
2. Please add a note to plans stating "A separate right-of-way construction permit is required for all
work within the city right-of-way." Please note, a ROW permit application with contractor's
signature shall be provided to the city prior to issuance of civil construction plans.
3. Where plan corrections affect multiple plan sheets, please update all.
Sheet 1 of 6 — COVER SHEET AND NOTES
1. ok
2. ok
3. ok
4. ok
Sheet 2 of 6 — TESC PLAN
1. ok
2. ok
3. ok
4. ok
Sheet 3 of 6 — TESC DETAILS
1. ok
Sheet 4 of 6 — GRADING, DRAINAGE & UTILITY PLAN
1. ok
2. June 14, 2019 — Please revise 751" PI W Typical Section detail on Sheet 6 to clearly indicate
center of pavement. A minimum 11-ft travel lane shall be provided with this project from
the center of pavement to the face of the gutter (12-ft to face of curb).
2/12/2109 comment — Provide a cross of 75th PI W and clearly label:
a. Center of pavement
b. Center of right-of-way
c. Curb, gutter, and sidewalk placement
3. ok
4. ok
5. ok
6. ok
7. ok
8. ok
9. ok
10. ok
11. ok
Page 2 of 4
12. ok
13. ok
Sheet 5 of 6 — WATER MAIN EXTENSION PLAN
1. June 14, 2019 — Please remove Detail 1 and the reference to this detail in plan review. City
standard details provide all required info.
2/14/2019- Provide a blow-up detail of the water main connection at 751h Pl W and 74th Ave W.
A 3-valve cluster will be required at this connection point, consistent with City standard detail
WA-181. Please reference City standard detail and incorporate into plan set.
2. June 14, 2019 — The layout does not actually reflect 45-degree bends. Please revise
drawings to accurately show the 45's.
2/14/2019 - Installation of the 3-valve cluster will require installation of an additional 45-degree
bend. Please show and callout on the plans.
3. ok
4. ok
5. ok
6. ok
7. June 14, 2019 — Thank you for providing the requested information. Please revise as noted
below:
2/14/2019 - Revise plans to address the following:
a. ok
b. Label edge of pavement
At the north end of the project a minimal amount of asphalt will remain between
the trench and the existing edge of pavement. This small area will be disrupted
during construction and will not be a good candidate for a 2" grind. Revise to show
this portion of the asphalt being removed and replaced with the trench or shift the
water main further east to align the trench with the edge of pavement.
c. Show painted fog line
Restoration of the painted fog line has been indicated on the plans, but the painted
fog line is shown in a very thick, bold line, which is confusing with the water main
extension. Please revise the line type for the fog line so it is less prominent than the
water main.
d. ok
e. ok
f. ok
g. ok
h. ok
8. June 14, 2019 — Revise "Ex. 6" DI Water" callout on 75" PI W to point to the water main.
It currently points to the storm main.
9. June 14, 2019 — In the area of the new valve cluster installation, add a note to the plans
that states the exact location of the transition from 6" to 8" water main is unknown.
Contractor shall pothole to verify and coordinate with the Engineer of Record and City
Engineering Division if a conflict exists.
10. June 14, 2019 — Provide survey stationing and offsets along 74t" PI W to ensure water main
and appurtenances are installed in the correct location.
11. June 14, 2019 — Provide profile of utilities in 741" Ave W and address the following:
a. Show all utilities, including crossings.
Page 3 of 4
b. Confirm vertical separation between water and sewer. The DOE "Orange Book"
requires a minimum 18" vertical separation measured from the outer diameter of
the pipes.
c. Please add a note to the plans that states "Water main shall be laid in one
continuous rising slope with no intermediate high points that would trap air in the
pipe. Any intermediate high points will require installation of an ARV per City
standard detail WA-120.
Sheet 6 of 6 — SITE DETAILS
1. ok
2. ok
Sheet 8 of 9 — SITE DETAILS
1. June 14, 2019 — Revise Sheet No reference to DT3.
Sheet 9 of 9 — TRAFFIC CONTROL
1. ok
STORMWATER ENGINEER REVIEW
Refer to attached plan review comments by City Stormwater Engineer, Zachary Richardson.
Please contact Zack directly at 425-771-0220 or by email at
zachary.richardson(a edmondswa.2ov with any specific questions you may have regarding his
comments.
Page 4 of 4
STO RM WATE R REVIEW COMMENTS
City of Edmonds
Engineering Division
Jn
To: Engineering Reviewer
Date: May 23, 2019
Project Name: Trang 2-lot SP
Permit Number: PLN20180028
Address: 23135 75t" PI W
Review Type: Plat Civil
Submittal Date: 5/9/2019
Reviewer: Zack Richardson, PE
City of Edmonds, Stormwater Engineer
Recommendation: I recommend that PLN20180028 be withheld until the comment
below are adequately addressed.
Review Comments:
1
It appears that new impervious surfaces have been added since the preliminary
approval plans were prepared for approval; update project plans and report to
consider, tally, and mitigate for the extra driveway area as new impervious
surfacing.
a. Check that the revised impervious sum does not exceed 5,000 SF and
trigger additional requirements, and/or update plans ad report as needed
to reflect additional minimum requirements.
Page 1 of 2
2. Revise WWHM model to utilize the Puget East 36 rain gage data; in WWHM
check the "use WS-DOT Data" box and click to find the 36 value on the map.
3. It remains unclear how the frontage improvements are mitigated for; update
plans and report to address/clarify how MR #5 is applied to the frontage
improvement area.
a. Pervious concrete may be used for public walkways, but not public vehicle
travel ways; if used, ensure accommodations are made to prevent
infiltration water from entering utility service trenches/backfill (impervious
liners, check/trench-dams, etc).
4. Identify the overflow route from the Lot 1 trench and address impacts to adjacent
structure, if any; ensure topographic information matches current site conditions
first, and/or update topo as needed.
5. It is unclear exactly how/if the frontage flows are conveyed to the existing
drainage system; provide significantly more grading information to demonstrate
that the frontage improvement will be directed to the intended drainage locations.
a. It appears that the existing road may not have a tradition crown and may
direct runoff east for a portion of the frontage and west for a portion;
provide sufficient spot elevations and/or profiles along the saw cut line,
new flow line, and existing downstream flow line to the next CB in order to
demonstrate that how surface flows are conveyed along the frontage
(including at the hinge point for the taper).
b. Update typical road section (on DT1) or road section sections as needed.
c. Provide addition information to show how drainage is controlled across the
pedestrian opening near the southern limits.
6. Update TESC plan and work limits to reflect the anticipated work under this
permit (ie. west portion of site).
7. Update TESC plan to protect infiltration areas with fencing; and/or add notes to
direct contractor to obtain geotechnical approval of the subgrade prior to placing
any rock in the infiltration facilities.
8. Provide detail or specification sufficient enough for the contractor to meet the
requirements of BMP T5.13 (amended soils); City standard detail is SD-642.
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