ENG AND STORMWATER RESPONSE LETTER 1.pdfDesign Build 5ervice5, Inc.
Engineering & Construction Management
28119 -120th 5t. S.E., Monroe, WA 98272 Phone /Fax: (360) 793-9659
E-mail: rheicle@db5monroe.com
May 1, 2018
Jeanie McConnell/Zachary Richardson
Engineering Division
City of Edmonds
(425) 771-0220
www.edmondswa.qov
Subject: Application BLD20180149 March 16 City Comments Response
As requested I have reviewed the comments provided. My responses are as follows:
General:
1. Noted
2. Noted
3. Approval Block has been added to all sheets.
4. Construction sequence has been updated with City sample.
5. General Construction Notes have been added.
6. Stormwater covenant is attached without notarization until form has been approved
by City.
7. The easement referenced has been reviewed by our title company. Their response
is as follows but basically the easement is not on this property:
The attached easement appears to affect a different plat — Lake McAleer 5 Acre
Tracts in Vol 5, Page 48. This plat is in the SE % of Section 31 27 4. Our Plat —
Skelton's Lake McAleer 5 Acre Tracts in Vol 6, Page 21 is located in the NE Y4
of Section 31 27 4.
8. Note has been added as note 14 on sheet 1.
9. Note added as Note 14.
SWPPP — Sheet 3
10. Silt fence has been added to encompass the site except at the high area that will not
be disturbed. Standard detail E1.1 has been referenced.
11. Standard detail E1.2 has been referenced in Construction entrance note.
12. City of Edmonds detail E1.3 has been referenced for storm inlet protection.
13. Orange protective barrier note added to key notes.
14. Stockpile cover in 24 hours note has been added to stockpile key note.
15. Compost BMP T5.13 note requested has been moved from the GRADING &
DRAINAGE NOTES to the KEYED NOTES.
Jeanie McConnell/Zachary Richardson
Application BLD20180149 March 16 City Comments Response
May 1, 2018
Page 2 of 3
Drainage Plan
1. City Utilities are shown based on survey location of manholes and City GIS
information.
2. Utilities are shown as requested. Water service is shown.
3. The southern WM shown on the plans has a meter in it. The one shown to the north
is empty. A note has been added that it is to be removed per the City Inspector's
direction.
4. The utility locations are show that meet the required separations. A note with that
has been added to the plans.
5. Note added to plans.
6. Note added to plans.
7. No irrigation connection is proposed.
8. Note added to plans.
9. The sewer run has been shown as requested.
10. The 6" pipe is already in place.
11. 6" clean -out is already in place as required with lamphole and hexbolts.
12. Clean -out and pipe run shown as specified. Note with requirements added to the
plan.
13. Elevations added with minimum 2' cover confirmed.
14. The existing sewer will be reused but the existing sewer will be removed to the
existing 6" clean -out and then run new to the new house as shown.
15. Note added to require TV inspection placed on plan.
16. Note added.
17. Utilities have been shown meeting requirements and a note with the requirements
added to the plan.
18. Footing drain inverts have been specified. And drywell location shown.
19. Inverts are shown as requested.
20. The easement is not applicable to this lot. The infiltration systems have not been
relocated.
21. Spot elevations have been provided as requested.
22. Swale has been speced to take water to existing low area at SW property corner.
Stormwater Review Comments
1. Plans have been updated to show specified 42' long trenches. The 48 Sf of walkway
is not collected for infiltration. It is being sheet flowed off into the landscaping or
onto the pervious pavement.
2. The note was meant to specify the amount of water from upstream was small. This
is confirmed by the SWPPP review item 10). To accommodate the small amount of
water coming from the south a swale has been specified to maintain the existing
overflow path to the SW.
3. The report has the sizing on page1/6 in the first appendix section. The roof area is
used per the description in MR5 on page 8 of the report.
4. The field results specify silty sand as that is what is between 36" and 48". Below 48"
is where the medium sand was fond. A note has been added to the plans requiring
embedment of the trench into the medium sands at 48" depth.
Jeanie McConnell/Zachary Richardson
Application BLD20180149 March 16 City Comments Response
May 1, 2018
Page 3 of 3
5. Note added per notes 8 and 9 above and key note 14 on the drawing.
6. Spot elevation per comment 36 above. Slope is very flat. Required slopes met.
7. Spot elevations have been added and detail provided showing elbow.
8. Overflow path shown with swale from infiltration and driveway with spot elevations.
9. Drywell added and specified by note for footings drains separate from roof drains.
10. The slope grading has been revised slightly and a swale specified to make sure the
water goes to the SW as it does currently.
11. Note has been updated as requested and clarified with detail now on same sheet.
12. Pipe IE, bottom and rim elevations specified with note and on the details.
13. Note added per comment 13 above.
If you have any further questions or I can be of any further assistance please call me at the
above number.
Rick Heide, P.E.
President
Attachments
.� of 1iD'Vo CITY OF EDMONDS
PLAN REVIEW COMMENTS
- ENGINEERING DIVISION
(425) 771-0220
City Website: www.edmondswa.gov
DATE: March 16, 2018
TO: Don Locke
Locken Designer Homes
Lockendesignerhomes@comcast.net
FROM: Mitch Boyd, Stantec Consulting Services
Mitch.Boyd@edmondswa.gov
RE: Application #: BLD20180149
Project: Locke - Single Family Residence
Project Address: 23202 761h Ave W
During review of the above noted application, it was found that the following information,
corrections, or clarifications are needed. Please submit revised plans/documents including a written
response to each item below.
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, application and other forms, and development code
may be referenced on the City website: www.edmondswa.gov under Services/Permits and
Development.
GENERAL
1) Submit ROW Permit Application form
2) Submit Side Sewer Permit Application form
3) Include a City Engineering Division approval block on all plan sheets. Refer to sample oil
City website.
4) Include construction sequence. Refer to sample on City website.
5) Include General Construction Notes. Refer to sample on City website.�
6) A Stormwater Covenant is required to be recorded against the property based on the
proposed stormwater facilities for the project. Please complete the covenant, including
notarization and any required exhibits and submit to the city. Ensure the stormwater
covenant meets Snohomish County Record Drawing requirements. The document must be
complete, but will not be recorded prior to permit issuance. Prior to construction, final
location of facilities are to be verified (by field inspection and asbuilt) and then the covenant
will be recorded.
7) Show all City easements. There is an existing 15' sewer easement, easement # 1722878, on
the east property line.
8) Add a note to the plans stating existing failing, damaged or non-ADA compliant frontage
improvements shall be removed and replaced as determined by the City Engineering
Inspector.
9) Utility patches shall be combined and full width or half width overlay will be required
depending on the extent of disturbance. Where utility patches fall entirely within one travel
lane, the overlay shall extend to the centerline of roadway. Where utility patches extend into
both travel lanes then a full width overlay is required.
SWPPP — SHEET 3
10) The property is located on a local high point per Edmonds GIS, the existing contours
provided on the plan set, and LIDAR. Please provide filter fencing around the entire
perimeter of the project. Incorporate and reference City of Edmonds standard detail E1.1.
11) Incorporate and reference City of Edmonds standard detail E1.2 for construction entrances.
Maintain the existing paved drive for as long as possible and install the E1.2 construction
entrance as needed.
12) Incorporate and reference City of Edmonds standard detail E1.3 for inlet protection.
13) Orange protective barrier fencing shall be placed at the drip line of trees to remain and
around areas proposed for low impact development techniques, such as infiltration systems,
to protect the area from compaction.
14) Add a note that the stockpile is to be covered within 24 hours.
15) Please add a note to the plans that all disturbed soils will be compost amended per BMP
T5.13.
DRAINAGE PLAN — SHEET 2
16) Show all City utilities that are adjacent to the site. Currently, the existing water main and
water service lines are not shown.
17) All utilities should be shown from the city main line/lateral to the structure. Please show the
entire water service line.
18) There are two existing water meters on the plans. Please label which water meter is to be
reused for service to the proposed residence and which is to be removed.
19) Show that there is a minimum of 3' of horizontal separation between the water service and
dry utilities (i.e. power, phone, gas, cable, etc.).
20) A minimum of 10' of horizontal separation is required between water and sewer lines.
21) A minimum of 5' of horizontal separation is required between water and storm lines.
22) Add a note to the plans indicating where the landscape irrigation backflow assembly will be
located (if one is proposed).
23) Please add a note to the plans that all final restoration shall be completed by the contractor
not the City of Edmonds.
24) The entire proposed sewer run shall be shown from the main line to the house.
25) Label pipe material and size. The sewer lateral (from the main to the property line shall be
6". Once on private property the sewer may reduce to 4".
26) Show a 6" cleanout at the property line. Please add a note that the 6" cleanout at the
property line shall have a 12" cast iron lamphole cover with hexbolts.
27) Show a cleanout located within 2' of the house, at any 90' bend, and when there is less than
3' between two 45' bends.
28) Provide invert elevations at the main, the cleanout at the property line and at the house so
that a minimum 2% slope and minimum 2' pipe coverage can be verified. If the slope of the
pipe exceeds 20% the pipe will need to be anchored.
Page 2 of 3
29) If the existing side sewer is to be re -used, the line must be cut and capped a minimum of 20'
from existing and/or proposed foundation whichever is closest to the property line. If the
existing side sewer is not proposed for re -use then the sewer shall be cut and capped at the
property line. Please revise the plans accordingly.
30) Please add a note that the existing side sewer will need to be TV'd by the contractor and
video must be submitted to the City for review and approval to re -use.
31) If the existing sewer lateral is proposed to be reused, the City's Public Works Department
will need to TV the lateral to determine if it is acceptable to re -use. Add notes to the plans
to contact Edmonds Public Works Sewer Division, 425-771-0235, to schedule inspection.
32) Show all dry utilities and required utility separation. Please add a note that a minimum of 3
feet separation is required between the dry utilities (power, gas, phone, cable, etc.) and wet
utilities (sewer, water, and storm). Dry utilities must be 5 feet from any City main lines.
33) Per the architectural plan, footing drains are to be installed. Please provide the footing drain
invert elevation and show where the footing drains will discharge to.
34) Provide invert elevations for all pipes at catch basins and manholes. Please note that a
minimum of 2' of cover is required for all pipes located under driveable surfaces and 1' of
cover under landscape areas.
35) The infiltration systems are currently proposed to be installed within the sewer easement.
Please relocate the infiltration systems.
36) Please provide spot elevations at the corners of the proposed driveway.
37) Proposed contours near the south wall of the proposed residence encourage stormwater to
build up. Will any dewatering devices be installed to prevent damage to the proposed
residence?
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
zachar� .r ichardsonru edmonc}sir a.�,:ov with any specific questions you may have regarding his
comments.
Page 3 of 3
"". 10'
To:
Date:
Project Name:
Permit Number:
Address:
STORMWATER REVIEW COMMENTS
City of Edmonds
Engineering Division
Engineering Reviewer
March 16, 2018
New SFR (Locke — 76tn)
BLD20180149
23202 76t" Ave W
Review Type: SFR Building Permit
Submittal Date: 11/17/17
Reviewer: Zack Richardson, PE
,^
City of Edmonds, Stormwater Engineer
Recommendation: I recommend that BLD20180149 be withheld until the comments
below are adequately addressed.
Review Comments:
1. General: Update plans & report to be consistent on weather each trench is 40.5'
or 41' long; ensure sizing include walkways and collection point (drain) for
walkways.
2. General: Drainage report notes that no runoff flow are anticipated due to a "ridge"
which does not appear to be reflected in the topo; update plans as needed to
show ridge line and add callouts for preservation of the ridge line or update plans
(add yard drains, swales, etc) and report to account for run-on from the west.
3. Drainage Report: Update report to include a sizing calculation for the final
BMP/trench sizing (ie. SF /1000 X sizing factor for soil type).
4. Drainage Report: It is unclear why the field results assessed site soils as "silty
sand" (ie. fine sands) but the sieve analysis found (and BMP sizing used)
"medium sands"; provide text to explain difference and or update sizing as
needed.
5. Civil Sheet 2: Add callout or notes to either protect or restore the thickened
edge/drainage control that exists along the project frontage.
6. Civil Sheet 2: Provide spot elevations or sufficient grading information to show
driveway sloping; ensure sloping meets requirements for pervious pavements.
7. Civil Sheet 2: Show all storm drain piping to and between the infiltration trenches,
including the yard drain or CB with sump and downturned elbow (or vertical tee).
Page 1 of 2
8. Civil Sheet 2: Update plans to identify the overflow path from each BMP;
overflows cannot negatively affect public sidewalk.
9. Civil Sheet 2: Show footing drain outlet location and provide details as needed for
construction of outlet; typically done in separate drywell if not connected to City
storm drain.
10. Civil Sheet 2: It appears the grading plan will result in a steepened slope directly
south of the residence and patio which will likely result in runoff directed toward
the proposed structure; provide additional collection points for drainage, revise
slope grading, or provide written response as to why engineer believes this to
sufficient for protection of the home.
11. Civil Sheet 2: Update note #13 to reference the corresponding detail on following
sheets.
12. Civil Sheet 2: Provide a trench top, pipe invert, and trench bottom elevation for
each trench (can be shown on detail on sheet 4 if both trenches are the same).
13. Civil Sheet 3: Update plan to show fencing or other method of protecting
infiltration surfaces/BMP areas.
Page 2 of 2