BLD20070223-1.pdfCity of Edmonds
1215 TH AVENUE NORTH • EDMONDS, WA 98020 • (425) 771-0220 FAX(425) 771-0221
Website: www.ci.edmonds.wa.us
DEVELOPMENT SERVICES DEPARTMENT
Planning • Building • Engineering
Plan Review Corrections
Application #: bld2007O223 Date: April 25, 2007
Project Name/Address: Eaglewood Homes Inc. / 901 Cedar Street
Contact Person/Address/Fax/e-mail: Craig Reimer / 18607 OVD/ 425-771-6822 / Fax: 425-775-8395/ e-
mail: rimetimegcomcast.net
Reviewer: Jaime Hawkins Division: Engineering
During review of the above noted application, it was found that the following information, corrections, or
clarifications are needed. Please submit three (3) sets of revised plans/documents with a written response
to each of the items below to a Permit Coordinator. JoAnne Zulauf is your City contact for this project.
1. The proposed rockery show in the Site/Grading/Drainage Plan is encroaching in the Right -of -Way. Please
remove the section of the rockery encroaching into the Right -of -Way; also please refer to Edmonds standard
detail E8.9 for guidance when building a rockery abutting the Right-of-way.
2. The sanitary sewer shall have a 6" cleanout installed on the street side at the property line with a 12" Cl
locking lamphole cover at finished grade. The side sewer can be 4" from the property line to the house. A
4" cleanout is required at the house. Please show these requirements on the plans.
Drainage:
1. During the site visit on 4-20-2007 there was no evidence of test pits at the locations marked on the attached map.
A signed and dated infiltration report to be completed by a qualified technician shall be required. An infiltration
rate of 11.2 inches per hour seems too optimistic for the site and soil types.
2. Per the DOE 1992 Stormwater Management Manual HI -3.6.6 BMP RI. 15 Roof Downspout System: System shall
be a minimum of 10 feet from any structure, property line, or NGPE. (There does not appear to be enough room
for this kind of system.)
3. Per the DOE 1992 Stormwater Management Manual III -3.3.2 General Limitations 2 (GL -2) Depth to Bedrock,
Water Table, or Impermeable Layer: The base of all facilities shall be located at least three feet above the
seasonal high water mark, bedrock (or hardpan), and/or impermeable layer. This could result in the BMP not
functioning as designed. The silt/hardpan layer needs to be located and included in a geotechnical report. The
geotechnical report shall include soil types, composition, and depth of silt/hardpan layer.
DATE E -MAILED -4/25/07 PAGE 1 of 2
4. Per the DOE 1992 Stormwater Management Manual Figure III -3.17 Roof Downspout System. Roof Downspout
System overflow with splash block is needed as shown in the figure. See notes on plan details.
5. Per the DOE 1992 Stormwater Management Manual Figure III -3.17 Roof Downspout System — Section A -A.
Surround system with washed drain rock and wrap trench entirely with filter fabric. See notes on plan details.
6. Show the location of the observation port on the Infiltrator Chamber detail. See notes on plan details.
Conclusions: Infiltration does not appear to be feasible at this location. There are several concerns related to this type of
system at this location. 1) The Alderwood soils usually have an impermeable silt layer about 20 to 40 inches below the
surface. On the west side of the property there has been some filling so the impermeable layer may be slightly deeper. If
there is an impermeable silt layer within 7 to 8 feet of the surface the infiltration system may not be feasible. (See item #
3 above) 2) There is not enough space for the minimum required setbacks (See item # 2 above)
Recommendations: Consider going to a more conventional detention system as outlined in the City of Edmonds
Stormwater Handout # E72.
Please contact me at 425-771-0220 or by e-mail at hawkinsna,ci.edmonds.wa.us if you have specific
questions regarding these plan corrections.
DATE E -MAILED -4/25/07 PAGE 2 of 2
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ESTABLISH VEGETATIVE COVER
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NATIVE BACKFILL
INFILTRATOR SYSTEMS
CHAMBER
LEVEL OF INFILTRATION
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36"
ZONE OF TREATMENT
SUITABLE UNDISTURBED SOIL
HIGH CAPACITY TRENCH SECTION
N. TS.
9" MIN. (12" MIN. UNDER D/W)
18" MAXIMUM COVER
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INFILTRATOR SYSTEMS INC. OK EQ01VAILENT
6 BUSINESS PARK ROAD
P.O. BOX 768
OLD SAYBROOK, CT 06475
800-718-2754
860-577-7000
FAX. 860-577-7001
EMAIL: INFOWIL TRA TORS YSTEMS COY
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