23920 FIRDALE AVE.PDF11111111111111
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23920 FIRDALE AVE
TAX ACCOUNT/PARCEL NUMBER: 5s4, 7"
BUILDING PERMIT (NEW STRUCTURE):
COVENANTS (RECORDED) FOR:
CRITICAL AREAS: DETERMINATION: [] Conditional Waiver [] Study Required Ej Waiver
DISCRETIONARY PERMIT #'S:
DRAINAGE PLAN DATED:
PARKING AGREEMENTS DA
EASEMENT(S) RECORDED FOR:
PERMITS (OTHER):
PLANNING DATA CHECKLIST DATED:
SCALED PLOT PLAN DATED:—!��Z/�,�q,
SEWER LID FEE $:
LID #:
SHORT PLAT FILE: LOT: BLOCK:
SIDE SEWER AS BUILT DATED: SIDE SEWER PERMIT(S) #:
SOILS REPORT DATED:
STREET USE / ENCROACHMENT PERMIT #:
FOR:
WATER METER TAP CARD DATED:
OTHER:—
LATEMP\DST's\Fomis\Sftwt File Checklist.doc
US SUWACE MCS, Am�
&A%dtrsQ.Wm3,f.ntrtUrw - 2,5!Z
HuM Fteur 1 1,649 sf.
Garagp 1 454 sf.
lb"NewAy 1 1,353 N
WaUmays i t34 sf.
Beirk 1 t14 SF- 0
Covered Porch - 106 isir.
Cs.
PADF LK675'I
p
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3unt Parcel J1
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DATUM FMNT +1W
13 65' f-'WTH [IF
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15' DRIVEWAY EASEMENT ON LOT 13
FOR A,B AND C TO FIRDALE AVE. W.
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HEIGHT
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CUBIC YARDS jqAYs _,,-15' Ul) 0
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SECTION II I of 'D CD
AVG. CUT OF 3�5' 20, C:D M p
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CUBIC YARDS = 73.11 cc
IMMENSE DIRT ui
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TOTAL CUBIC YARDS 119.15 SCALE 1'=20' STOCK PIL (80 2.5' 14' 0j= U m
7.5 P � 'C
0 0 5' 27.5' D (--D
LOT COVERAGE Tax Account Parcet # 1 CD
n ou
3,810 SQ,FT. (47%) 2703-360-030-4400 0 9,5'
SECTION 11 21.5'
LOT AREA LOT SLOPE DRAINAGE PLAN 14' A' CD
PROPOSED
8,058 SQFT. LESS THAN 5X ACCORDING TO (�j
�2 5' RESIDENCE Lli CD
SP 97-009 48.5' > 03
U
FILTER ABRIC
SECUREDF TO 2' X 2* SECTION I
agi"� koTo I IS RESPONSIBLE FOR 20,
SION '6"010NJ ROLAND DRAINAG 14.5' _j <l:
2' 11 AM OR j 5' 0
EGUIVALENT_�\' CU 14' Z
37'
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22' 7.5' 0"
W LK LL_
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DATUM POINT +100' q:=�C)
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IN§UQpM AREOURME lEll AREA
TIM ENTRANCE 15' DRIVEWAY EASEMEN ZGNUE-ERNG 0� __j
OURIN(i THE CONSTRUCTION PERIOD. V
FOR A,13 -AND C TO R AVE. W.
6u
4 Su4e4wve, . Date:
IMPERVIOUS SURFACE CALCS.
Proposed Building Roof Outline 1 2,555 sf.
Proposed Main Floor 1 1,649 sf.
Proposed Garage 1 454 sf.
Proposed Driveway 1 1,353 sf.
Proposed Walkways 1 134 sf.
Proposed Deck 1 114 sf.
Proposed Covered Parch 1106 sf.
HEIGHT CALCS.
A +10;3'
C +101,
D +101,
AVE, GRADE = 101,75'
ACTUAL GRADE 120.25'
MAXIMUM GRADE 126.75'
3,131(1 SW,FT. (47%)
LOT AREA j
8,058 SQ.FT.
Tax Account Parcel #
2703-360-030-4400
LOT SLOPE i
LESS THAN 5Z
01 20'
SCALE 1'=20'
APPROVED BY ENGINEERING
A � In
DO: 21-111�71?
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REVISED DRIVEWAY PLAN FOR LOT B V31r,
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GRADING CALCS.
SECTION I I
AVG. CUT OF 2'
CUBIC YARDS = 46.04
SECTION 11 1
AVG, CUT OF 3.5'
CUBIC YARDS = 73.11
TOTAL CUBIC YARDS = 119.15
LOT COVERAGE 1
3,810 SQ.FT. (477)
LOT AREA 1
8,058 SQ.FT.
FILTER FABRIC
SECURED TO 2 ' X 2'
14 GA. WIRE FABRIC
EQUAL
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EQUIVALENT
B'- 12'
87 42'
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5 DEC 2, 14'
5' 27,5' %D
I ax Account ParceL # 1
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LOT SLOPE 1 DRAINAGE PLAN
LESS THAN 5% ACCORDING TO
SP 97-009
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THE TRENCH AND ON BOTH SIDES OF
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PROPOSED
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14' 5'
37'
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DATUM POINT +100'
CB 65' NORTH OF
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"IM THE CDKSTRWTIM PERIGIL C)
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Jands Construction Lot Infiltration Systems
City of Edmonds
Parcels # 27033600604300
27033600604400
27033600604500
Technical Information Report
RECEIVED
'T FILE Project Site:
MAR 0 4 2002 T R F_= . F
pERMIT COUNTER 239xx Firdale Ave W
Edmonds, WA 98020
jvr�;
V ta
�J
� k-al
1 40 Ab 'Ov�'
February 22, 2002
Prepared for
Paul Thompson
Janris Construction
15028 - 228th St SE
1011". W.
793' Snohomish, WA 98296
�uj dL-
V-^, V1 (425) 424-3488
tS�N
XAAE.6 o
3
Deeign build 5ervicee, Inc.
Engineering & Conetruction Management Phone /F= (360) 795-9659
28119 -120th 5t. S.E., Monroe, WA 98272 Pager. (425) 359-23652
E-mail: rhaide0characteHink.net
Janris Construction
Technical Information Report
Table of Contents
1. Project Overview
p 3
2. Conditions and Requirements Summary
p 3
3. Off -Site Analysis
p 3
4. Retention/Detention Analysis and Design
p 3
5. Conveyance Systems Analysis and Design
p 4
6. Special Reports and Studies
p 4
7. Other Permits
p 4
8. Erosion/Sedimentation Control Design
p 4
9. Bond Quantities Worksheet, Retention/Detention Facility
p 4
Summary Sheet, and Declaration of Covenant
10. Maintenance and Operations Manual
p 4
List of Figures
Figure 1 TIR Worksheet
Figure 2 Site Location
2
1. Project Overview
I
This project consists of three new SFR's and associated walk and driveways being
built on three 8,000 s.f. lots created as a short plat in the late 90's. The plat concept
was for a detention pipe discharging to the Firdale drainage system. As the site is
underlain by a deep deposit of Everett soils, the new impervious is being infiltrated in
accordance with the King County Design manual that states that all lots on outwash
soils shall be evaluated and if feasible infiltrated. The total proposed new impervious
is 10,871 s.f. for all three lots. A TIR Worksheet is attached as Figure 1 and a site
vicinity map is attached as Figure 2.
2. Preliminary Conditions Summary
The site is in the City of Edmonds and bounded by 100th Ave W and Firdale Ave W.
The site is underlain by Everett soils.
3. Off -Site Analysis
All flows will be infiltrated. Any overflow of the system will flow in the same drainage
path as it does now to the system along Firdale as originally proposed by the short
plat.
In summary the off -site topographical and vegetative conditions suggest no unusual
drainage or erosion problems.
4. Retention/Detention/Water Quality Analysis and Design
No off -site flows are coming on -site within the area of development. On site flows
are being infiltrated in infiltration trenches. The 98KCSWDM requires residential
sites with less than 22,000 s.f. to be evaluated for infiltration.
The site was evaluated using three soil log holes and three infiltration tests. The
tests showed the soils to be course sand and gravel draining much in excess of the
maximum design rate of 20 in/hr. All holes drained within 5 minutes and could not
actually be kept filled. No mottling or evidence of water was observed in any of the
holes to 4' depth.
The roof downspouts are going to infiltration trenches and the drive runoff is being
sheet flowed to a separate catch basin and infiltration system for each lot. These are
shown on the attached site grading plans.
5. Conveyance Systems Analysis and Design
The only conveyance is by 4" PVC as directed in the KCSVVDM required downspout
infiltration details.
6. Special Reports and Studies
No special reports are required.
7. Other Permits
No other permits are required.
8. Erosion/Sedimentation Control Design
.Silt fence had been provided on the design drawing downstream of any proposed
disturbance.
The required construction entrance is shown on the plan.
9. Bond Quantities Worksheet,
Facility Summaries, and Declaration of Covenant
A Bond Quantities Worksheet is not required for a small site Appendix C application.
No'covenant is required.
10. Maintenance and Operations Manual
Not required.
4
-L - �'�
0 0
List of Figures
Figure 1 TIR Worksheet
Figure 2 Site Location
R,
P�Qw
m
I
l(ing County Department of Development and. Environmental Services
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
F
'-P
project Owner
.Address
1 0—,2 -
Phone
Project Engineer
Company---�
-'�,P�,at tA-.:,iPRQJ.EZT�-L,0,G1 mio
..P.T.PR
Project Name
ILocation
Township
Range
............. section
Effs
'Part*4;;, THER
- 2g;
Subdivison DFW HPA
Short Subdivision COE 404
Grading DOE Dam Safety
Commercial FEMA Floodplain
Othe; COE Wetlands
M' DiPEFM.8---
Shoreline Management
Rockery
Structural Vauft
Other
P,b d -8 P m -d AC T- E A I SI
River Roodplain
Wetlands
Stream Seeps/Springs
critical Stream Reach High Groundwater Table
Depressions/Swales GroundwaterRecharge
Lake Other
Steep Slopes
Soil Type. Slopes Erosion Potential Erosive'Velcoties
C)
Additional Sheets Attached
Fi&t ez` .'DEMS'P.
REFERENCE UMITATION/SITE CONSTRAINT
Ch. 4 — Downstream Analysis
Additional Sheets Attached
MINIMUM ESC, REQUIREMENTS MINIMUM ESC REQUIREMENTS
DURING CONSTRU=ON AFTER CQNSTRUC-nON
Sedimentation Facilid tabilize Exposed Surface
il e :E oLsedrlac a�ESC Facilftles
or r
nd D bris
ities
nt -
lz xp Su 8 : ID
Stabi iz onstruction Entrance Remove and Restore Temporary,ESC acilities
ea
n
R
Perimeter Rpncyff Control Clean and Remove All Sift and Debris
r Ope _0
Clearina of m
-aad—Graing Restrictions Ensure Operation of Permanent Facilities
I m of 0 0 sp
(2�oveeEjr�a�ctices Flagg m SAO and open space
Construction Sequence preservation areas...
Other
Other
I
. 0 0
-�C
Method of Analysis
Grass Lined
Tank
Infiltration
9"e, c-rZt W\.—�
Channel
Vault
epression
I
Compensatlon/Mifigati
pipe System
Energy Dissapator flow Dispersal
on of Eliminated Site
Open Channel
Wetland
Waiver
Storage
Dry Pond
Stream
Regional
Wet Pond
Detention
Brief Description of System Operation
Facility Related Site 1-imitations
Reference Facility Limitation
4(-A
Y
W,-',,S T R U C P
Cast in Place Vault Drainage Easement
Retaining Wall Access Easement
Rockery > 4! High Native Growth Protection Easement
Other I I Other
R SSl(DNAL.;EN.PJNEER-.*..
F-
t:IZAIGNATU-E�:Q PROPE.
I or a civil engineer under my supervision my supervision have visited the site. Actual site
conditions as observed were incorporated into this worksheet and the attachments. To the best of
my knowledge the information provided here is.accurate.
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DRAINAGE PLAN
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11111110 MONOSSON
5. 1.1 DOWNSPOUT INHLTRATION SYSTEMS
0
FIGURE 5.1.1.A TYPICAL DOWNSPOUT INFILTRATION SYSTEM
11 . -
PLAN VIEW 4"rigid or 6" flexible
NTS . . Z perforaled pipe
................................ . ...
% ...................................................
infiltration trench
PLAN VIEW
NTS
overflow
,C rigid or 6* flexible splash block
perforated pipe
6-
...... .................................. .
6- iaa 0
-Z ------- ------------ -----------
washed rock CIO 'a C46 a 4
iz. 0 1 la"-314! &Deal
76. 00 q7 0 CV
......... ......................... ... ..... fine mesh,-g
varies 10'min
filter fabric
1998 Surface Water Design Manual
r/1
SECTION A
NTS
roof
drain
sump w/solid lid
roof drain
5.01
CB'sump w/solid lid
compacted backfill
e rigid or 6* flexible
perforated pipe
washed rock
9/1/98
5-7
SECnON 5.1 ROOF DOWNSPOUT CONTROLS
FIGURE S.LLB
ALTERNATIVE DOWNSPOUT INFMTRATION SYSTEM FOR COARSE SAND AND GRAVEL
roof
grass
ovedlow 6* min
1 1W - 3/0 7: no dimensions
washed rock NOTE. Same le
I min and site limitations as typical *system
C,
L2'min 15'min
1998 Surface Water Design Manual
911/98
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5.1.1 2&SPOUT 24FMTRAIION SYSTEMS
DOWNSPOUT INTUTRATION SYSTEMS
runoff fromfoof
Downspout infiltration systems are trench systems intended only for use in infiltrating
downspout drains. They are not designed to directly infiltrate surface water that could transport sediment
or pollutants, such as from paved areas.
C3 BASIC REQUIREMENTS
1. Single family subdivision projects subject to Core Requirement #3 must provide for individual
downspout infiltration systems on an lots smaller than 22,000 square feet if feasible.
2. 1be feasibility or applicability of downspout infiltration must be evaluated for all subdivision single
family lots smaller than 22,000 square feet. The evaluation procedure detailed below shall be used to
determine if downspout infiltration is feasible or whether downspout dispersion can be used in lieu of
infiltration. This procedure shall also be used to evaluate all projects proposing to apply roof
downspout controls as flow control BM?s per Section 5.2.
3. For subdivision single family lots greater than or equal to 22,000 square feet, downspout infiltration is
optional, and the evaluation procedure detailed below is only required if downspout infiltration is
being proposed voluntarily. Note: If downspout infiltration is not required or provided on these lots,
then a downspout dispersion system must be provided per Section 5.1.2 (p. 5-9)
C3 PROCEDURE FOR EVALUATING FEASIBILITY
I . A sons report must be prepared by a geotechnical engineer. The report must reference a sufficient
number of soils logs to establish the type and limits of soils on the project site. The report should at a
minimum identify the limits of any outwash type* soils (i.e., those meeting USDA soil texture.classes
ranging from coarse sand and cobbles to medium sand) versus other soil types.
2. On lots or sites with no outwash type soils, a downspout dispersion system per Section 5.1.2
ye A-- ire 1A14 for flow
-,quay-twused firliev vL-uujau.&&. H --rispeut-44naffitra 4041 .
control sizing credits, it must be shown to be feasible as described below. testin
3. On lots or sites containing outwash type soils -(coarse to medium sand), additional site -specific 9
must be done. Individual lot or site tests shall consist of at least one soils log, a minimum of 4 feet in
depth (from proposed grade), identifying the SCS series of the soil and the USDA textural class of the
soil horizon through the depth of the log, and noting any evidence of high groundwater level, such as
mottling. Note: This testing is also required on lots or sites where downspout infiltration is being
proposed in soils other than outwash.
4. if site -specific tests indicate less than 3 feet of permeable SOH to the seasonal high groundwater
table, then a downspout dispersion system per Section 5.1.2 may be used in lieu of infiltration. If
downspout infiltration is still desired to qualify for flow control sizing credits, the minimum Moot
depth to groundwater may be met by using fill material as allowed in the design criteria below.
5. On lots or sites with more than 3 feet of permeable soil to the seasonal high groundwater table,
downspout infiltration is considered feasible and mandatory if the soils are outwash type soils and the
infiltration trench can be designed to meet the minimum design criteria specified below. Voluntary
provision of downspout infiltration must also meet these design criteria in order to be approved as
feasible.
0 DESIGN CRITERIA
Figure 5.1.1.A (p. 5-7) shows a typical downspout infiltration system, and Figure 5.1.13 (p. 5-8)
presents an alternative infiltration system for sites with coarse sand and cobble soils. These systems shall
be designed as specified below.
1998 Surface Water Design Manual 9/l/98
ISECnON 5.1 ROOF DOWNS OLS
General
1. Downspout infiltration trenches shall be the following minimum lengths (linear feet) per 1,000
square feet of roof area based on soil type:
Coarse sands and cobbles: 20 LF
Medium sand: 30 LF
Fine sand, loamy sand 75 LF
Sandy loam 125 LF
Loam 190 LF
2. AL%Amum length of trench shall not exceed 100 feet from the inlet SUMP.
3. Nanimurn spacing between trench center lines shall be 6 feet.
4. Filter fabric shall be placed over the drain rock prior to backfilling.
5. Infiltration trenches may be placed in fill materW if the fill is placed and compacted under the
supervision of a geotechnical engineer, and if the measured infiltration rate is at least 8 inches per
hour. Trench length in fill shall be 60 linear feet per 1,000 square feet of roof area. Infiltration rates
shall be tested using the methods described in Section 5.4.1 (p. 5-53).
6. Infiltration trenches are not allowed on slopes steeper than 25 % (4: 1). A geotechnical analysis and
report may be required on slopes over 15% or if located within 200 feet of the top of steep slope or
landsli& hazard area.
7. Trenches may be located under pavement if a small yard drain or catch basin with grate cover is
placed at the end of the trench pipe such that overflow would occur out of the catch basin at an
elevation at least one foot below that of the pavement, and in a location which can accommodate the
overflow without creating a significant adverse impact per Core Requirement #1 (see Section 1.2. 1).
Ukftgt: To prevent saturation of the pavement subgrade in the event of system failure.
Setbacks
1 . An trenches must be at least 5 feet from any structure, property line, or sensitive area (except steep
slopes).
2. All trenches must be at least 50 feet from any sensitive area steep slope. This setback may. be
reduced to 15 feet based on a geotechnical evaluation, but in no instances may it be less than the
buffer width.
3. For sites with septic systems, infiltration trenches must be downgradient of the drainfield. This
requirement may be waived if site topography clearly prohibits subsurface flows from intersecting the
drainfield.
Documentation Requirements
1 . The approved plans for single family subdivision projects must show infiltration trench details and
the approximate location and size of each proposed downspout infiltration system and septic system
(if applicable). Alternatively, details of representative lots may be provided to depict approximate
locations of downspout infiltration systems and septic systems (if applicable).
2. If the proposed project is a subdivision, the following note conditioning single family residential
building permits on compliance with the approved infiltration systems shall be recorded with the plat
or short plat:
"Single family -residences constructed on lots created by this subdivision must provide downspout
infiltration systems according to the details shown on the appro�ved plans."
9/1/98 S-6 1998 Surface Water Design Manual
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ALL CLAIMS FOR DAMAGES OF WHATEVER NATURE, ARISING DIRECTLY OR INDIRECTLY
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WORKMEWS ON INSURANCE AND RCW 18.27.
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'APPLICANT, ON BEHALF OF HIS OR HER SPOUSE, HEIRS, ASSIGNS AND SUCCESORS Fire Review Plan Chk. Deposit
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ORIGINAL - FILE - YELLOW - INSPECTOR
CATE OF OCCUPANCY HAS BEEN GRANTED. UBC SECTION 109
PINK - OWNER - GOLD - ASSESSOR
04/02 PRESS HARD -YOU ARE MAKING 5 COPIES GREEN - ACCOUNTING