1381_001rEc
Rffis t$ tr$
JUN I ü 2OI9
BIJILDING MEPARTMËzu]CI'['YEF ËDMOhJDS
lHSlçH? f NG!ì¡ltRll'lG CO
Re:
April9,2019
TnA nne 7¡tlaf trnc¡ineerins Technic.ian--'Þ-^^'-^^-^ÞI2l 5rh Ave N
Edmonds, WA 98020
(42s) 77r-0220
Cary Rd - 8LD20190155
IECO No. 19-0983
Dear JoAnne,
The project referenced above is revised in response to the review comments dated March 7,
2019. The review comments are numbered on the letter and have been addressed in italics as
follows:
GENERAL
1) Submit ROW Permit Application form.
The application will be submitted along with the submittal.
2) Submit Side Sewer Permit Application form.
The applicatíon will be submitted along with the submittal.
3) Include a City Engineering Division approval block on all plan sheets. Refer to sample on
City website.
A new approval box has been added to all sheets based on the website sample. See all
sheets.
4) Include General Construction Notes. Refer to sample on City website. Please change the
WSDOT/APWA version to the curent year.
General Construction notes have been added. See sheet C3
PO Box 1478 r Everett, WA 98206 o Phone: (425) 303-9363
Fax (425) 303-9362 r Email:info@insightengineering.net
5) 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.
The covenant is included with the submittal.
6) Show all City easements. There is a 16 ft utility easement down the center of Cary Rd.
There is also a sewer easement up to and approximately five to ten feet past the public
sewer cleanout in the northeast comer of the lot. See Edmonds GIS Map easement layer
for more information.
The 16' utílity easement h(ts been shown along Cary Road. The l}-foot sewer easement
located to the northeast of the property does not appear to be located on the site. A
review of this property title did not show the easement. The ffiite easement recorded
under Auditor's file number 1747992 has been shown on the map.
7) Showhaul routes
The contractor will plan haul routes prior to the start of construction.
8) Show proposed fence and gates.
A proposedfence and gate are shown.
9) Re-label the garage to reflect its intended use. Add a note stating that there will be no
vehicle access.
The plans have been revised to include driveway access to the north side of the garage.
See revised plans.
DEMO
1) 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.
The side sewer is now proposed to be replaced to the property line in the northeast
corner of the lot. See sheet Cl.
2) If the existing water service line is to be re-used, the line must be disconnected at the
meter during construction. Please install a hose bib with an AVB at the meter during
construction.
PO Box 1478 o Everett, WA 98206 r Phone: (425)303-9363
Fax (425) 303-9362 o Email:info@insightengineering.net
A note has been added. See sheet CI.
3) Show existing utilities on the plans.
Natural gas and overhead pov)er are shown.
4) The project is located within the downtown area. Please show and/or describe the haul
-^- -+^r u uttr.
Contractor will plan haul routes prior to the start of construction,
WATER
1) As indicated by the Fire Department, a fire sprinkler system is required for this property
Typically, if there is an existing water service line from the water main to the meter, the
water service line/meter will not be the appropriate size and a nsw tap will be required.
The applicant will be required to pay for the new tap on the main and the new meter.
Please revise plans to include the following:
a. Please add a note that a 1" meter is to be installed. Add standard detail to plans.
A note and detail have been added. See sheet Cl & detail4/C4.
b. Show the water meter located in the right-of-way, such that the back of the meter
is on the property line. The water meter shall not be located within the driveway.
A new l " water meter is now shown on the ROW side of the property line. The
water meter is not located withín the driveway. See sheet C1.
Please show a I-112" water service line to be installed from the back of the meter
to the house (as required for a combination fire and domestic service).
A 1 %" water service line is now called out between the proposed water meter
and the house. See sheet Cl.
d. Please label the pipe material and note tracer wire to be installed on the water
service line.
A note has been added. See sheet Cl
2) Please add a note to the plans that all final restoration shall be completed by the
contractor not the City of Edmonds.
A note has been added. See note l0 on Sheet Cl
PO Box 1478 r Everett, WA 98206 r Phone: (425) 303-9363
Fax: (425) 303-9362 o Email:info@insightengineering.net
c
SEWER
1) Label pipe material and size. The sewer lateral (from the main to the edge of easement
shall be 6". Once on private property the sewer may reduce to 4".
Pipe material and size are now shown. See sheet Cl.
,)\ CL^.,, ^ ÉI ^l^^^^,,+ ¡+ fl¡a ^,{-^ ^f oaca'-an* Þloooo o¡lrl o nnfp lhaf fhp Átt nleannrrf of fheL) Ulluvv 4 v wlv4¡¡vut 4L lr¡w wsów vl v4ùvrrr!1rL. r rvsÙv ssv s ¡¡vLv
property line shall have a 12" cast iron lamphole cover withy2" hexbolts. Please add
sewer standard detail to plans.
A calloutþr a 12" cast iron lamphole cover with t/2" hexbolts has been added to the
existing sewer cleanout located in the northeast corner of the property. See sheet C I.
3) Show a cleanout located within 2' of the house, at any 90o bend, when there is less than
3' between two 45o bends, and when there is more than 100' between cleanouts.
Clean outs have been added to comply with the requirements mentioned. See sheet Cl
4) Provide invert elevations at the main, the cleanout at the property line and at the house so
that aminimum 2o/o slope and minimum?' pipe coverage can be verified. If the slope of
the pipe exceeds 20Yothe pipe will need to be anchored.
Elevations and slopes have been added to the sewer system. See sheet CI
5) Please add a note "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."
The existing side sewer will be removed and replaced.
6) Please add a note "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."
Note Added See note 2 on sheet Cl; however, we are proposing a new side sewer line.
DRY UTILITIES
1) Show all dry utilities and required utility separation. Please add a note that a minimum of
3' separation is required between the dry utilities þower, gas, phone, cable, etc.) and
sewer, water, and storm and 5' from any City main lines.
Dry utilities are now shown with the necessary separation. Gas is located along the south
side of the house with other dry utilities connecting to the northwest corner of the house
via an overhead power line. See sheet C l.
PO Box 1478 r Everett, WA 98206 r Phone: (425)303-9363
Fax: (425) 303-9362 o Email:info@insightengineering.net
STORM
1) Please note that a minimum of 2' of cover is required for all pipes located under drivable
surfaces and 1' of cover under landscape areas. The pipe at CB2 do not have minimum
cover.
,l --^¿^ l^^- L^^,- -))-) C1-^.^^t- Q ^,- ^l^^^t /-l
-17- ftute ftuJ ueeft uuu(u. úYc ftule o utt ùttvçt v I
2) Please add a note to the plans that if the rim to invert elevation exceeds 5-feet then a type
II manhole will be required.
A note has been added. See note l3 on sheet Cl
Review Comments fromZackRichardson, P.E. / Stormwater Engineer
March 15,2019
1. General: It appears that an existing garage is being retained and represents an existing
unmitigated impervious surfaces subject to the retrofit requirements of ECDC.
18.30.060.D.5.b.i; update plans & report to reflect this requirement and provide 25%ó
mitigation of existing impervious surfaces to remain.
The existing patio to remain have been qdded into the permeable pavers calculations. See
page 18 of the drainage report and sheet Cl. The existing garage already infiltrates and
wíll continue in the proposed scenario.
2. Drainage Report: Expand the upstream analysis to describe the existing runoff from
Carry Rd; update developed conditions section and plans as needed to address impacts of
these flows (ie, install AC berm, preserve thickened edge, maintain sheet flow onto site,
etc).
a. If a new drainage control mechanism is proposed (ie. install AC berm), the
impacts on downstream properties must be assessed.
b. If taken on-site, the impact of run-on flow to the proposed BMPs should be
assessed.
The upstream analysis has been revised to discuss Cary road'sflow. See page 13
of the drainage report.
3. Drainage Report: Expand the downstream analysis to provide more description of how
dispersed flow will enter the conveyance system and any impact from surface flows in
between those points and to address if all site flow truly end up in this conveyance
system.
a. It appears the north trenches will discharge north of this system and bypass it;
update analysis as needed.
PO Box 1478 r Everett, WA 98206 r Phone: (425)303-9363
Fax (425) 303-9362 o Email:info@insightengineering.net
We are no longer proposing discharging surfaceflows. We are proposing
infilnation.
4. Drainage Report: Expand developed conditions to explain how the project areas meet the
requirements for full dispersion per BMP T5.30, including the required conditions of the
downstream vegetated flow path (maximum slope, surface materiallnative vegetation,
graded to avoid re-consolidating dispersed flows, etc.). In particular, the reviewed has the
f^tt^--.:.^^rUrrU W llrB Uullt/gr rrù.
a. It is not clear that more than 65Yo of the site is preserved as 'native or forested
condition'; update or explain as needed.
The project has been revised andfull infilnation ís now proposed. See revised plans
and drainage report.
b. It is not clear that the areas meet vegetation or surfacing requirements for a native
vegetated flow path (SWMMWW Volume Y, page 947).
See above comment.
c. Driveway dispersion trench appears undersized.
See above comment.
d. It is not clear that the dispersion path, as shown, does not direct flow north onto
the adjacent property for both ofthe north trenches.
See above comment.
e. It is unclear that the south trench does not exceed 15% slopes downstream
See above comment.
f. It is unclear that the south trench does not result in a re-consolidation of runoff
into a point discharge within the proposed flow path.
See above comment.
5. Drainage Report: Existing conditions for the sake of peak flow comparison shall be based
on historic conditions which are generally 100% forested unless historical evidence is
presented to the contrary; revise pre-developed model to 100% forested or provide
justification as needed.
a. Conversely, the developed model may use flow control credits per SWMMWW
Appendix III-C (provided the BMPs are designed in accordance with existing
standards).
PO Box 1478 o Everett, WA 98206 o Phone: (425) 303-9363
Fax: (425) 303-9362 r Email:info@insightengineering.net
b. Additionally, if the site is truly designed to meet all requirements for full
dispersion, C.2.1. suggests no modelling is required; if this option is used, it
should be clearly stated and referenced in the text.
The project has been revised and must now meetflow control standards. See
Appendix B of the drainage reportfor the new Wí4/HMreport.
Á n-^:-^^^ D^*^4. /l^*^-^11,, ^:-^l^ f^*:1., f ^.,,-^ ^-^ -^+ *^l^ll^l ^- ^^^+,,-^. -^,,:^^U. LJlatlt4év r\vP\JrL. U!lltel4llJr ùrllËrU-l4lllrrJ r(lvvllJ 4lrv llUL llluLlçllvll Clù Pdùlut!, lLvlù!
developed model to "lawn" instead of "pasture" or provide justification for alternate
modelling inputs (check SWMMWW III-2.2.2 fnst).
Lawn is now used instead of pasture. See Appendix B of the drainage reportfor WWHM
report.
7. Drainage Report: Include a calculation for the driveway dispersion trench (and any
additional trenches added during revisions); it is not clear the driveway is adequately
mitigated.
The dispersion trenches are no longer proposed. See sheet Cl
8. C1: Identify and show the limits of each required vegetated flow path.
See comment 7 above.
9. Cl: Show setback, or minimum setback, dimensions from the nearest property line to
each dispersion trench.
See comment 7 above.
10. C1: List the top elevation for each trench.
See comment 7 above.
I 1. Cl: It appears most rim and invert elevations are inconsistent with the handful of spot
elevations provided; review and adjust accordingly.
Rim and IE's have been revised. See sheet Cl
12. CI: It is not clear that the footing drain connection won't create a backwatered condition
in the footing drains; provide additional information about the footing drain elevations
(ie. a minimum elevation for the perforated portions).
a. If the footing drains connect to the dispersion trench, the footing drains should be
a minimum of 6" above the top of trench elevation in order to maintain minimum
freeboard.
PO Box 1478 o Everett, WA 98206 o Phone: (425) 303-9363
Fax: (425) 303-9362 o Email:info@insightengineering.net
The IE outfor the footing drain has been qdded. The footing drain is now
proposed to be connected to the permeable pavementfar enough downhill to
achieve more than 6" ofdropfrom the IE out. See sheet CI.
1 3. C 1 : Adjust inverts at CB #2 as needed to maintain a minimum 1 ' cover.
CB#2 has been removed. See revised plans.
14. Cl: Correct typo in roof split exhibit; both sections labelled as "to CB #1" currently.
Corrected.
15. C2: Add a note to this sheet stating that the contractor shall install amended soils per
BMP T5.13 for all disturbed pervious areas on site and reference the detail provided on
sheet C3.
A note has been added. See sheet Cl
16. C2: Show additional grading information (or drainage improvements) to address, or to
more clearly show, the following concerns:
a. It appears portions of the west-most patio, walkways, and portion of driveway
will drain away from the structure to the roadway without any proposed collection
point. It is unclear how these surfaces are collected and routed to the mitigation
BMPs; update grading, add collection points, and/or update drainage plan to
reflect this condition and account for these surface areas.
Permeable pavement is now proposed along the west of the house. See revised
plans and report.
b. It is not clear where the area west of the structure between the roadway changes
from drainage to the west versus drainage to the mitigation BMPs to the east and
likely results in a local low point somewhere in this transition; update or address
as needed.
Existing spot elevatíons have been added. Permeable pavement is now proposed
along the west of the house. See sheet C 1.
c. It is unclear how the north portion of driveway will control surface flow to the
flow east rather than flowing to the north/north-east over the edge of pavement;
show additional improvements (extruded curb, thickened edge, etc.) to more
clearly show how this area is controlled.
Permeable pavement is now proposedfor the driveway. See revised plans and
report.
PO Box 1478 o Everett, WA 98206 o Phone: (425) 303-9363
Fax (425) 303-9362 o Email:info@insightengineering.net
d. It not does appear that any collection points are provided for the "NE\M DM
ECK" and basement floor areas east of the proposed structure; clarify how these
areas will drain and be routed to the proposed mitigation BMP, or provide
additional dispersion trench(es) as needed/feasible.
The basementfloor area is now to drain to a cleanout and be conveyed to the
permeable pavers. The "NEW DM ECK" area is existing patio to remain. See
sheet Cl.
Please feel free to contact me with any questions or comments you may have.
Sincerely,
,/t
-'< I
ó"*
Brian Kalab, P.E.
PO Box 1478 r Everett, WA 98206 o Phone: (425) 303-9363
Fax: (425) 303-9362 r Email:info@insightengineering.net