ENGINEER RESPONSE TO ENG.pdf9740 Evergreen Way * Everett, Washington 98204
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December 4, 2015 a I'Ary
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City of Edmonds
Attn: Jennifer Lambert
121 5t" Avenue North
Edmonds, WA 98020
Subject: 1St Construction Plan Comments, BLDG20151168
Dear Ms. Lambert:
DEC 14 2015
. D1140 DEPANTMENT
&W or-,FOW)NDS
Below is a response to comments you and others made per review of construction plan documents
dated November 13, 2015:
Demo:
1. Contractor to address
Site Plan:
1.
Architect to address.
2.
Architect to address.
3.
Architect to address,
4.
Architect to address..
wt0121149
1. Project number updated
2. Note has been added.
3. Silt fence was originally only showed along the south boundary line of the site. The only
proposed line shown along the west boundary line is the limits of construction/clearing
limits. No change necessary.
4. All existing trees to remain and to be removed are shown.
5. Drip line of trees has been added.
6. Tree protection notation has been added for trees to remain.
7. Temporary stock pile location noted on plan.
8. Notes have been added for protection of compaction of areas around proposed infiltration
trench.
Sheet.. 2 of 2 — Drainage & UtiliU Pian
1. Project number updated Note added.
2. Drip line of trees has been added.
3. Existing curb and wall along the north side of the driveway is to be removed and has been
noted accordingly on the grading and SWPPP plan.
WATER:
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SE CONSULTANTS * CIVIL ENGINEERS *LAND SURVEYORS *ENGINEERING CORPORATION
9740 Evergreen Way * Everett, Washington 98204
WESTERN
ENGINEERS &(425) 356-2700 FAX (425) 356-2708
SURVEYORS
SURVEYORS •ENGINEERS • LAND USE CONSULTANTS
Sewer:
Storm:
See comments below addressing fire sprinkler needs.
a. Note has been added to upgrade existing water meter with V service, if necessary.
b. Existing water meter was previously shown and is located along the edge of RMI.
No changes needed.
c. New driveway has been slightly shifted north so as not to be located over existing
meter.
d. Water service line from existing water to new house previously shown. Note added
to install 1-1/2" line between meter and house.
e. Water service line noted as schedule 40 with tracer wire per city standard detail.
2. 10' min. separation between existing water and sewer service noted.
3. 3' min separation between dry utilities and other utilities noted.
1. Existing sewer stub noted on plans.
2. Sewer note has been added to plans.
3. Utility notes have been removed and updated to sewer specs only,
1. Acknowledged.
2. Site plan has been updated with revised drainage system.
3. All trees surrounding proposed infiltration trench are designed to be removed.
4. Driveway note added to slope driveway to south into adjacent landscaping
5. Roof drains now shown connecting from west corner of roof to infiltration system. Invert
elevations of roof drain at corner downspouts have been added. Note that this is the
lowest elevation the roof drain downspouts can be installed to.
6. Rim and invert elevations along with pipe sizing and slopes were originally noted on the
drainage plan near the bottom of the drawing sheet. Drawing has been revised to an
infiltration trench with elevations noted on plan.
7. Footing drain note added to daylight footing drains, if installed and/or drain to dry well.
Footing drains should generally not connect to drainage systems in the event the system
fails and backs up into the crawl space.
Additional Storm Comment:
See response below:
a. Per geotech report provided by Batterman Geotechnical, a design infiltration rate of
0.5 in/hr was used for infiltration design.
b. Design calculations for the infiltration trench have been provided in the drainage
report. Note that WWHM does not have the capability to calculate accurate yearly
storm release rates once individual yearly storm events approach zero runoff.
Because of this, there is no feasible way to calculate the developed 10 year release
rate for the infiltration trench. Instead, the trench has been designed to meet flow
control/stream bank requirements of an undeveloped basin which closely matches
the 10 year allowable release rate as noted in the LID Handout.
LAND USE CONSULTANTS * CIVIL ENGINEERS * LAND SURVEYORS * ENGINEERING CORPORATION
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9740 Evergreen Way * Everett, Washington 98204
WESTERN
NGIN ERS &(425) 356-2700 FAX (425) 356-2708
SURVEYORS
SURVEYORS • ENGINEERS • LAND USE CONSULTANTS
c. As noted above, drainage has been designed to flow into a new infiltration trench.
See updated plans for reference.
Assumed location of dry utility extensions have been shown on the grading plan. Note that
ultimately the utility providers install then where ever they fill necessary so location may
change during construction per utility provider preference. We are unaware of any gas
lines to be extended to the residence.
Sincerely,
Western Engineers & Surveyors, Inc.
Jesse Jarrell, P.E.
Project Manager
LAND USE CONSULTANTS * CIVIL ENGINEERS * LAND SURVEYORS * ENGINEERING CORPORATION
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