2267_001PAGE Eng¡neers I Planners I Surveyorg
PACE Erìg¡neer$, lnc. | $DA
1724 ì,V. Mar¡ne V¡ev.,Drive I Suiie 140
Everett, Wash¡ngton 98201-2088
p 425.486.6533 | f425.486.6593
An Eilglnssrln0 Ssûlc6s Côilpûny
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August 30,2019
City of Edmonds
Attn: Jeanie McConnell
121 5th Avenue North
Edmonds, WA 98020
Jenkins Lane Lot 4 - Single Family Residence
#BLD2OI9O8í5 lst Review - Response to Gomments
Dear Jeanie:
We are pleased to resubmit the attached Site Plan set for further review and approval. These plans
aresubmitted in responsetothe lstSite Plan Reviewfrom both Planning and Engineering. The
following is a summary of responses to the review comments contained on the plan set and comment
letters. Review comments are shown in plain text and our responses are provided in bold italics.
Comments from Jeanie McCon nell (ieanie.mcconnell@edmondswa.qov) :
General
1. 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.
submitted by applicant.
2. Submit Side Sewer Permit Application form.
submitted by applicant.
Sheet 1 of 3 - BUILDING SITE PLAN
1. Note driveway surface material as either concrete or asphalt
Concrete driveway noted.
www.paceeng¡"s.cor11
August 30, 2019
City of Edmonds
Page 2 of 5
Engineers I Planners I Surveyors
www. paceengrs.com
Sheet 2 of 3 - UTILITY AND TESC PLAN
1. Clarify Note 1 to state that the storm tightline shall not be connected to the footing drains any
closer than 1O-ft from the foundation.
Revrsed note.
2. Clarify Note 13 so it is clear the 1ft minimum cover does not apply to water and sewer. Sewer
shall have 2ft of cover and water shall have 18" cover, regardless of location being in paved or
landscaped area.
Revrsed note.
3. Orange protective barrier fencing shall be placed around the area of the drywell locations to
protect the area from compaction. Show on plans.
Added to construction sequence and shown on utility plan.
Sheet3of3-PLANNOTES
1. Revise General Note 1 to reflect the current version of the WSDOTiAPWA specs
Revised note.
2. Remove General Note #19. lt is not applicable to this project.
Removed note.
Gomments from Stormwater Ensineer. Zack Richardson (zaçkarv.lichardson@edmo-nds.wa.aov[
1. lt appears the proposal for this lot has increased the impervious area and decreased the
drywall volume since the previous plat approval; the minimum value now used (by simplified
sizing) meets code but represents a revision from the previously approved drainage plan
which requires additional attention [Comment truncated for brevity]
(a) Simplified sizing to meet MR #5 does not ensure that a regular overflow will not
occur here; for this reason these systems require a piped overflow. lf system
remains as currently designed, update plans to provide a piped overflow connection
to the city system.
(b) Alternatively, the applicant can demonstrate that the system achieves 1o0o/o
infiltration, typically requiring a \AA/r/HM model with the field measured infiltration
rate.
Design calculations have been provided as an attachment to this letter, to satisfy
alternative (b) above. The calculations demonstrate 100% infiltration of roof runoff.
PACE
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August 30,2019
City of Edmonds
Page 3 of 5
Engineers I Planners I Surveyors
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2. Show protective construction fencing around the drywell areas.
(a) lf fencing cannot be feasibly located during construction, add notes to over excavate and
obtain geotech approval of the subgrade prior to backfilling drywells.
Called out in construction sequence and added to utility plan.
3. Provide detail or specification enough for contractor to install soils meeting the requirements of
BMP T5.13 (City detail SD-642).
Detail SD-642 has been added to sheet 4 of 4.
4. Update drywell details to be SD-638 or update plan details to provide more of the required and
shown elements from the City version:
(a) Update "marked center" to provide an observation pipe to the bottom of the facility with
detail as/where needed for construction.
(b) Extend distribution pipe through entire width of drywell and bring to surface with clean-out
with detail as/where needed for construction.
(c) Calloutishow a push-on tee or downturned elbow in the yard drain upstream of the
drywells with detail as/where needed for construction.
(d) ldentify 12" minimum cover depth, provide a bottom of rock elevation, and ensure the two
are consistent with proposed finish grade.
(e) ldentify the top and bottom of rock elevation for each drywell.
The requested revisions have been made.
5. Show dimensions between the drywell and property lines (min 5')
Dimensions have heen added.
6. Provide a minimum footing drain elevation to ensure perforated portions of the footing drains
remain a minimum of 6" above top of rock for the infiltration facility, or revise footing drain
connection to be un effected by infiltration storage.
Minimum footing drain elevation is specífied on Sheet 2 of 4 (left side of sheet). The
attached drainage calculations demonstrate that the sfage depth in the infiltration
galleries is not likely to reach the top of the provided galleries.
7. There do not appear to be any collection point for pervious areas and the grading plan may
direct more runoff toward the adjacent road and wall to the west; update plans and/or provide
response to address concern as appropriate (infiltrates before it can reach edge, revise
grading to retain runoff, or add collection point and adjust drywell).
The lot grading contours have been adjusted slightly for clarification. Most of the
peruious area is intended fo s/ope toward the yard drain at the southwest corner of the
lot. A note has been added fo Sfieef 2 of 4 for additional clarification. Outwash soil
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August 30, 2019
City of Edmonds
Page 4 of 5
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underlies the site, and the topsoil specifîcation provided on Sheef 4 of 4, so tnosf runoff
is likely to infiltrate before reaching the area drain.
Comments from Planner. Michele Q. Szafran (qichele..g.?3ffan@edmpndswa.qpv)i
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¡ Please provide a scale on the site plan
Scale has been added
. Please verify the height elevation for point B
This elevation has been verified against the topographic survey and is listed
correctly.
2. Elevation Plans:
Please verify that the elevations provided are correct. The south elevation does not
appear to match the provided floor plan.
addressed
a Please label the elevation views accurately
addressed
3. Datum Point: A datum point is used to establish a starting mark to compute grade elevation of
the designated four corners for the building height calculations in order to verify zoning height
compliance. The datum point must be a permanent point of reference, such as the top of a
manhole cover, fire hydrant, water meter, or street monument. The datum point is also used to
verify the height of the structure during the height inspection or survey if required.
A datum point has been provided at the intersection of 7th and 13th Way SW however
you may want to pick a datum point which is closer.
Comment is noted, and will be forwarded to the proiect surveyor.
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Engineers I Planners I Surveyors
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PACE
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August 30,2019
of Edmonds
Sincerely,
PACE Engineers, lnc.
This concludes our response to the previous review'lqffiEn,-Please
(425) 486-6533, or if I can provide anything further.
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Kenneth J. Mclntyre, PE
Project Manager
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