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SCALE:
SCHEDULE ALL INSPECTIONS THROUGH MYBUILDINGPERMIT.COM
NOTE:
ALL DISTURBED AREAS TO BE COMPOST AMENDED PER 2014
SWMMWW BMP T.5. 13
INSTALL AND MAINTAIN ALL TESC MEASURES ACCORDING TO APPROVED
PLANS, CITY OF EDMONDS STANDARD DETAILS, AND ALL OTHER
MEASURES THAT MAY BE REQUIRED DURING CONSTRUCTION
ALL DISTURBED SOILS SHALL BE
COMPOST AMENDED PER CITY OF
EDMONDS STANDARD DETAIL SD-642 OR
APPROVED EQUAL.
OWNER/CONTRACTOR RESPONSIBLE FOR LOCATING
ALL ON SITE UTILITIES. RELOCATION/REVISION TO ANY
UTILITIES MAY REQUIRE A SEPERATE PERMIT.
OWNER/CONTRACTOR IS RESPONSIBLE FOR
EROSION CONTROL AND DRAINAGE
Applicant shall repair/replace all
damage to utilities or frontage
improvements in City right-of-way
per city standards that is caused or
occurs during the permitted project.
ENGINEERING DIVISION
APPROVED AS NOTED
JdJ Ulgl..trht►u 02/08/2022
VV
\ GRATE
���OVER SOCK OVER FLOW HOLES
(TYP)
CATCH BASIN
NOTES:
CATCH BASIN 1. CONTRACTOR/DEVELOPER SHALL MAINTAIN
THIS APPLICATION AT ALL TIMES DURING
CONSTRUCTION PERIOD.
2. ANY SEDIMENT IN CATCH BASIN INSERT
SHALL BE REMOVED WHEN INSERT IS
ONE-THIRD FULL.
3. CITY INSPECTION REQUIRED ON ALL
EROSION CONTROL METHODS BEFORE
OTHER WORK CAN BEGIN.
TEMPORARY
REVISION DATE
JANUARY 2018
CITY OF EDMONDS
SEDIMENT TRAP
STANDARD
PUBLIC WORKS
FOR CATCH BASINS
DEPARTMENT
DETAIL
ems/ Ig��
ER-902
APPROVED BY: R. ENGLISH
BMP T5. 13 I POST -CONSTRUCTION SOIL QUALITY AND DEPTH
PURPOSE AND DEFINITION
NATURALLY OCCURRING ( UNDISTURBED) SOIL AND VEGETATION PROVIDE IMPORTANT STORMWATER FUNCTIONS INCLUDING:
WATER INFILTRATION, NUTRIENT, SEDIMENT, AND POLLUTANT ADSORPTION, SEDIMENT AND POLLUTANT BIOFILTRATION,
WATER INTERFLOW STORAGE AND TRANSMISSION, AND POLLUTANT DECOMPOSITION. THESE FUNCTIONS ARE LARGELY
LOST WHEN DEVELOPMENT STRIPS AWAY NATIVE SOIL AND VEGETATION AND REPLACES IT WITH MINIMAL TOPSOIL AND
SOD. NOT ONLY ARE THESE IMPORTANT STORMWATER FUNCTIONS LOST, BUT SUCH LANDSCAPES THEMSELVES BECOME
POLLUTION GENERATING PERVIOUS SURFACES DUE TO INCREASED USE OF PESTICIDES, FERTILIZERS AND OTHER
LANDSCAPING AND HOUSEHOLD/INDUSTRIAL CHEMICALS, THE CONCENTRATION OF PET WASTES, AND POLLUTANTS THAT
ACCOMPANY ROADSIDE LITTER. ESTABLISHING SOIL QUALITY AND DEPTH REGAINS GREATER STORMWATER FUNCTIONS IN
THE POST DEVELOPMENT LANDSCAPE, PROVIDES INCREASED TREATMENT OF POLLUTANTS AND SEDIMENTS THAT RESULT
FROM DEVELOPMENT AND HABITATION, AND MINIMIZES THE NEED FOR SOME LANDSCAPING CHEMICALS, THUS REDUCING
POLLUTION THROUGH PREVENTION.
APPLICATIONS AND LIMITATIONS
ESTABLISHING A MINIMUM SOIL QUALITY AND DEPTH IS NOT THE SAME AS PRESERVATION OF NATURALLY OCCURRING
SOIL AND VEGETATION. HOWEVER, ESTABLISHING A MINIMUM SOIL QUALITY AND DEPTH WILL PROVIDE IMPROVED ON -SITE
MANAGEMENT OF STORMWATER FLOW AND WATER QUALITY . SOIL ORGANIC MATTER CAN BE ATTAINED THROUGH
NUMEROUS MATERIALS SUCH AS COMPOST, COMPOSTED WOODY MATERIAL, BIOSOLIDS , AND FOREST PRODUCT
RESIDUALS. IT IS IMPORTANT THAT THE MATERIALS USED TO MEET THE SOIL QUALITY AND DEPTH BMP BE
APPROPRIATE AND BENEFICIAL TO THE PLANT COVER TO BE ESTABLISHED. LIKEWISE, IT IS IMPORTANT THAT IMPORTED
TOPSOILS IMPROVE SOIL CONDITIONS AND DO NOT HAVE AN EXCESSIVE PERCENT OF CLAY FINES . THIS BMP CAN BE
CONSIDERED INFEASIBLE ON TILL SOIL SLOPES GREATER THAN 33 PERCENT.
DESIGN GUIDELINES
SOIL RETENTION. RETAIN, IN AN UNDISTURBED STATE, THE DUFF LAYER AND NATIVE TOPSOIL TO THE MAXIMUM EXTENT
PRACTICABLE. IN ANY AREAS REQUIRING GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN
A DESIGNATED, CONTROLLED AREA, NOT ADJACENT TO PUBLIC RESOURCES AND CRITICAL AREAS, TO BE REAPPLIED
TO OTHER PORTIONS OF THE SITE WHERE FEASIBLE.
SOIL QUALITY. ALL AREAS SUBJECT TO CLEARING AND GRADING THAT HAVE NOT BEEN COVERED BY IMPERVIOUS
SURFACE, INCORPORATED INTO A DRAINAGE FACILITY OR ENGINEERED AS STRUCTURAL FILL OR SLOPE SHALL, AT
PROJECT COMPLETION, DEMONSTRATE THE FOLLOWING:
A TOPSOIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10% DRY WEIGHT IN PLANTING BEDS, AND 5%
ORGANIC MATTER CONTENT IN TURF AREAS, AND A PH FROM 6. 0 TO 8 .0 OR MATCHING THE PH OF THE
UNDISTURBED SOIL. THE TOPSOIL LAYER SHALL HAVE A MINIMUM DEPTH OF EIGHT INCHES EXCEPT WHERE TREE ROOTS
LIMIT THE DEPTH OF INCORPORATION OF AMENDMENTS NEEDED TO MEET THE CRITERIA. SUBSOILS BELOW THE TOPSOIL
LAYER SHOULD BE SCARIFIED AT LEAST 4 INCHES WITH SOME INCORPORATION OF THE UPPER MATERIAL TO AVOID
STRATIFIED LAYERS, WHERE FEASIBLE. MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL
USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT REQUIREMENTS:
THE ORGANIC CONTENT FOR 'F)RE - APPROVED" AMENDMENT RATES CAN BE MET ONLY USING COMPOST MEETING THE
COMPOST SPECIFICATION FOR BMP T7 . 30: BIORETENTION CELLS, SWALES , AND PLANTER BOXES, WITH THE EXCEPTION
THAT THE COMPOST MAY HAVE UP TO 35% BIOSOLIDS OR MANURE . THE COMPOST MUST ALSO HAVE AN ORGANIC
MATTER CONTENT OF 40% TO 65% , AND A CARBON TO NITROGEN RATIO BELOW 25: 1 . THE CARBON TO NITROGEN
RATIO MAY BE AS NIGH AS 35:1 FOR PLANTINGS COMPOSED ENTIRELY OF PLANTS NATIVE TO THE PUGET SOUND
LOWLANDS REGION. CALCULATED AMENDMENT RATES MAY BE MET THROUGH USE OF COMPOSTED MATERIAL MEETING
(A.) ABOVE, OR OTHER ORGANIC MATERIALS AMENDED TO MEET THE CARBON TO NITROGEN RATIO REQUIREMENTS,
AND NOT EXCEEDING THE CONTAMINANT LIMITS IDENTIFIED IN TABLE 2 20 - B , TESTING PARAMETERS, IN WAC
17 3 - 350 - 2 20 . THE RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATION TO BE
ESTABLISHED. IMPLEMENTATION OPTIONS
THE SOIL QUALITY DESIGN GUIDELINES LISTED ABOVE CAN BE MET BY USING ONE OF THE METHODS LISTED BELOW:
LEAVE UNDISTURBED NATIVE VEGETATION AND SOIL, AND PROTECT FROM COMPACTION DURING CONSTRUCTION.
AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHER AT DEFAULT 'PRE - APPROVED" RATES, OR AT CUSTOM CALCULATED
RATES BASED ON TESTS OF THE SOIL AND AMENDMENT.
STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO PLANTING. STOCKPILED TOPSOIL MUST ALSO
BE AMENDED IF NEEDED TO MEET THE ORGANIC MATTER OR DEPTH REQUIREMENTS, EITHER AT A DEFAULT
'PRE -APPROVED" RATE OR AT A CUSTOM CALCULATED PATE.
IMPORT TOPSOIL MIX OF SUFFICIENT ORGANIC CONTENT AND DEPTH TO MEET THE REQUIREMENTS.
MORE THAN ONE METHOD MAY BE USED ON DIFFERENT PORTIONS OF THE SAME SITE. SOIL THAT ALREADY MEETS
THE DEPTH AND ORGANIC MATTER QUALITY STANDARDS, AND IS NOT COMPACTED, DOES NOT NEED TO BE AMENDED.
PLANNING/PERMITTING/INSPECTION/VERIFICATION GUIDELINES E PROCEDURES
LOCAL GOVERNMENTS ARE ENCOURAGED TO ADOPT GUIDELINES AND PROCEDURES SIMILAR TO THOSE RECOMMENDED IN
GUIDELINES AND RESOURCES FOR IMPLEMENTING SOIL QUALITY AND DEPTH BMP T5. 13 IN WDOE STORMWATER
MANAGEMENT MANUAL FOR WESTERN WASHINGTON . THIS DOCUMENT IS AVAILABLE AT:
HTTP://WWW . SOILSFORSALMON . ORG/PDF/SOIL_BMP_MANUAL . PDF
MAINTENANCE
ESTABLISH SOIL QUALITY AND DEPTH TOWARD THE END OF CONSTRUCTION AND ONCE ESTABLISHED, PROTECT FROM
COMPACTION, SUCH AS FROM LARGE MACHINERY USE, AND FROM EROSION.
PLANT VEGETATION AND MULCH THE AMENDED SOIL AREA AFTER INSTALLATION.
LEAVE PLANT DEBRIS OR ITS EQUIVALENT ON THE SOIL SURFACE TO REPLENISH ORGANIC MATTER.
REDUCE AND ADJUST, WHERE POSSIBLE, THE USE OF IRRIGATION, FERTILIZERS, HERBICIDES AND PESTICIDES, RATHER
THAN CONTINUING TO IMPLEMENT FORMERLY ESTABLISHED PRACTICES.
USE OF DRYWELLS FOR FULL INFILTRATION
Drywells are gravel filled holes as opposed to trenches and
therefore may allow for a more compact design
in areas where the depth to the maximum wet - season water
W table is relatively deep (e.g. 6 feet or greater) .
0 Figure C . 2 . 2 . C (p . C - 55) illustrates the specifications
for drywell infiltration systems as outlined below:
I . When located in coarse sands and cobbles, drywells must
contain a volume of gravel equal to or greater than
60 cubic feet per 1,000 square feet of impervious surface
served. When located in medium sands, drywells must contain
at least 90 cubic feet of gravel per I , 000 square feet of
impervious surface served .
2. Drywells must be at least 48 inches in diameter and
deep enough to contain the gravel amounts specified above
for the soil type and impervious surface area served.
3 . The gravel used for drywells must be I - 1 / 2 -inch to
3-inch washed drain rock. The drain rock may be covered
with backfill material as shown in Figure C . 2 . 2 . C
(p . C - 55) or remain exposed at least 6 inches below the
lowest surrounding ground surface.
4. Filter fabric (geotextile) must be placed on top of the
drain rock (if proposed to be covered with backfill material)
and on the drywell sides prior to filling with the drain rock.
5. Spacing between drywells shall be a minimum of 10 feet.
6. Drywells must be setback at least 15 feet from buildings
with crawl space or basement elevations that are below the
overflow point of the drywell.
APPROVED BY PLANNING
2/18/2022
Zone RS-8
Y
Corner :__Flag
` i N
:_
Setbacks:
Required
Actual
Front
25
25'
Sides
7.5'
10.5'
Rear
Other
Height
15'
14.58'
ROOF
DOWNSPOUT
HOUSE
ROOF FLOW
DOWNSPOUT
CATCH BASIN
(YARD DRAIN)
PLAN VIEW
ROOF DOWNSPOUT
�/_;
VERFLOW
HOUSE SPLASH BLOCK
FLOW
5'
MIN.
SETBACK
FROM
BUILDING
FINE MESH SCREEN —
CATCH BASIN
(YARD DRAIN)
10' MINIMUM
W
48 INCH DIAMETER
HOLE FILLED WITH
1 2" - 3" WASHED
DRAIN ROCK
MARK CENTER OF HOLE
WITH 1" CAPPED PVC
OR OTHER MEANS
FLUSH WITH SURFACE
Iti]MOi]I�1
MIN. 4" DIA.
PVC PIPE
SIDES OF HOLE
LINED WITH
FILTER FABRIC
48 INCH DIAMETER
HOLE FILLED WITH
1 2' - 3" WASHED
DRAIN ROCK
TYP.DRYWELL DETAIL-
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REVISIONS:
RESUB
Feb 03 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
BLD2021-1685
SHEET TITLE:
STORMWATER PLAN
DRYWELL DETAILS
BMP T.5. 13
ITY OF EDMONDS
TANDARD DET.ER-902
DESIGN BY: CNL
DRAWN BY, CNL
CHECKED BY: BERNARD
PROJECT NO:
SCALE:AS NOTED
SHEET #
A-2
DATE:
01-28-2022