HomeMy WebLinkAboutPermit File BLD-2021-0546 4507 Queen Ann Way (3) ORR(C8� �.
JC Storm Water Drainage Report
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Official Use Only: (Information to Inspectors)
Required Storm Water Facility and other related requirements:
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Project Address: _4507 Queen Ann Way Submittal Date: O'1 -oto-
Parcel Number: _P59240 Revision Number: ¢S
Permit Number: _BLD-2021- Reviewer: t_h a,JGt
Acceptance D - ): rj�_1S.2212I
FRONT OF REPORT:
Submittal Checklist: (All items listed below are required for a complete submittal)
o Cover Sheet (Preparer to Provide): Project title, Location, Revision dates, Engineer's Stamp
o TAB 1: Minimum Requirement#1 - Preparation of Stormwater Site Plans
o TAB 2: Minimum Requirement#2- Construction Stormwater Pollution Prevention (SWPP)
o TAB 3: Minimum Requirement#3- Source Control of Pollution
o TAB 4: Minimum Requirement#4- Preservation of Natural Drainage Systems and Outfalls
o TAB 5: Minimum Requirement#5- On-site Stormwater Managements
o APPENDIX 1 - Survey performed by a Professional Land Surveyor
o APPENDIX 2 - Soils Analysis (Volume 1, Chapter 3.1.1 "A4 e7>. ►O 1--1 'ra 8e S 6-t-c..J krAT2YC_.
i 3t-i;• 1 .-t-I4Z-0 LAIFILKNO �' ns12-
o APPENDIX 3 - Model Soil Management Plan for BMP T5.13 kbaw -��
o APPENDIX 4 - Determining Construction Site Sediment Damage Potential (Appendix 7)
o APPENDIX 5 - Site Plan with all applicable information (Minimum Size 11x17 - 30 scale)
o APPENDIX 6 - Documented Site Photos (North, South, East and West)
o APPENDIX 7 - Drainage BMP Facility Maintenance Covenant, if applicable. To be recorded prior to the
Temporary Certificate of Occupancy, Certificate of Occupancy or Final Acceptance.
Stormwater Management Requirements:
o Refer to the 2012114 Department of Ecology Manual, as amended in 2014 for further required
information.
o See also, City of Anacortes Municipal Code 19.76 for additional information
o See also, current Engineering Development Standards, Chapter 2- Storm Drainage for additional
information.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Project Description and Summary:
Summary Table
Existing Proposed
Development Type Undeveloped Single Family
Number of Lots 1
Lot Acreage in SF 11,300 SF
Soil Type(s) Catla gravely fine sandy Loam HG
D
Site Sediment Transport Score (High\Low) Low 90
Depth to Ground Water Table (Feet and Inches) 17"to 20"
(See completed Soils Analysis(Volume 1, Chapter 3.1.1)
Infiltration Rate during Rainy Season (Inch\Per Hour) N/A due to shallow water table
Impervious Surface (on-site) 0 4,118 sf
Impervious Surface (off-site) 0 0
New and Replaced Hard Surface Total (SF) 0 4,118 sf
Lot Coverage (Percentage) 0 36%
BMP (Required Minimum Requirement 5) BMP T5.13 Post Construction Soils
'0\ �6.12S\ cc c i 'tom. 13r, -r .t — Nc i- Dtiealzs►�J
Water Quality Method (Minimum Requirement 6) N/A
Water Quantity Method (Minimum Requirement 7) N/A
Existing Site Conditions Summary: P
(Additionally, provide information on previous permits, if any, like Grade and Fill, Clear and Grade, topography,
vegetation, drainage, Critical Areas adjacent to the site and how it may affect this project if soils are disturbed,
Soils Type (Included in Soils Analysis Report), Erosion Problem Areas, Construction PhasinglSequence)
The existing 11,300 square foot site is undeveloped grass with no trees. The site slopes at an average
of 15% down to the south in the area of the house with short steeper slopes up to 50% at the north end
of the site. Developed Queen Ann Way fronts the north with single family homes to the west and
south. An undeveloped lot lies to the east. There are no drainage easements or systems that extend
to this property at the bottom south end. A sanitary sewer and easement does extend up from the
south to this property.
Developed Conditions Summary:
(Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard
surfaces, proposed contours)
The project is to construct a 3,015 square foot single family home in addition to a 729 square
foot driveway and sidewalk and a 374 square foot deck on the south side of the home. No
additional fill is proposed for the site.
New roof area = 3,015 sf
New driveway = 729 sf
New deck = 374 sf
Total new impervious area = 4,118 sf
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Drainage Basin (2007 Storm Comp Plan— City website\publicworks\engineering\comprehensive plans):
What Drainage Basin are you in? B13 Identify any downstream drainage issues (Storm Comp Plan: Yes. If
so, describe:
This site does not discharge directly to a storm system. Any discharge sheeting across properties to
the south of the lot will reach the storm water system in Bryce Drive. This drainage system flows to
the southeast and discharges to the Clyde Creek. Clyde Creek flows to the southwest under Anaco
Beach Road to Outfall #1 at Burrows Bay. The Stormwater Management Plan identifies the Outfall pipe
as being surcharged.
•
The site does discharge to a Flow Exempt Water.
Complete the Applicability Requirements — Flow Chart(Figure 1-2.4.1 Attached, Figure 1-2.4.2 Attached
and.Figure 1-2.5.1 Attached)
Figure I.2.4.1 Flow Chart for Determining Requirements for New
•Development •
Start Here
Does the site have 35% Yes See Redevelopment Minimum
or more of existing I► Requirements and Flow Chart
impervious coverage? (Figure 1-2.4.2).
No
•
Does the project convert
acres or more of vegetation to
Does the project result in lawn or landscaped areas,or
5,000 square feet,or No convert 2.5 acres or more of
greater of new plus i native vegetation to pasture?
replaced hard surface
area?
No
Yes
Yes Does the project result in 2.000
square feet,or greater,of new plus
All Minimum Requirements replaced hard surface area?
apply to the new and replaced
hard surfaces and converted Yes No
vegetation areas.
. v
Does the project have land
• Minimum Requirements WI disturbing activities of 7,000
through#5 apply to the new ® Yes square feet or greater?
and replaced hard surfaces
and the land disturbed. • No
V
Minimum Requirement42
applies.
•
..11113111 Figure I-2.4.1
Flow Chart for Determining Requirements for
New Development
DEPARTMENT OF
TAB 1 (MINIMUM REQUIREMENT#1)
• 1-2.5.1 Minimum Requirement#1 —Prepare a Stormwater Site Plan
- 1.3— Preparation of a Stormwater Site Plan
- 1.3.1 —Stormwater Site Plans: Step-by-Step
Note: The level of detail needed for each step depends upon the project size. Provide a narrative
description of each step.
1-3.1.1 Step 1 - Site Analysis: Collect and Analyze Information on Existing Conditions
Site analysis shall be submitted as part of the Existing Conditions Summary above. Part of the
information in this step should be used to help prepare the Construction Stormwater Pollution
Prevention Plan. Purpose of the Site Analysis is to provide for a Low Impact Development site
design that is intended to compliment the predeveloped conditions of the site.
A Stormwater site plan has been prepared showing erosion control methods for this site.
The site slopes at 15% to the southwest corner of the site. Developed roads with curb,
gutters and storm drainage fronts the uphill side of the project so no offsite water flows
onto this site. No storm drainage paths or easement exist at the bottom of this site.
1-3.1.2 Step 2- Prepare Preliminary Development Layout
Based upon the analysis of existing site conditions, locate the buildings, roads, parking lots,
landscaping features, on-site stormwater management BMP's, and preliminary location of
stormwater treatment and retention/detention facilities for the proposed development.
BMP's will include covering soil stock piles and protecting down slope properties with silt
fencing. The temporary construction entrance will be off Queen Ann Way on the North
side of the property. Grading will take place across most of the entire site. Storm water
will be discharged as described in Minimum requirement#5 will take place in the northeast
corner of the site.
1-3.1.3 Step 3 - Perform Off-site Analysis (at Local Agency's Option): Use additional Sheets, if
necessary,
Ecology recommends that local governments require an off-site analysis for projects that add
5,000 SF or more of new hard surfaces, or convert 3/4 acres of vegetation to lawn or landscape
areas, or convert 2.5 acres of forested area to pasture.
Off-site analysis extends to mile downstream of the project site.
Storm water sheets to the south onto neighboring properties. Bryce Drive lies 142 feet
south of the southwest corner of this lot. The storm system in Bryce Drive collects storm
water in a catch basin at the point 142 feet south of the southwest corner of the site and
directs flow south and east to a 36" storm pipe and discharges to Clyde Creek a total of
625 lineal feet down stream from the inlet. Clyde Creek flows for a distance of 814 feet
before discharging through the 400 lineal feet of 36" culver pipe under Anaco Beach Road
to Burrows Bay.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
1-3.1.4- Determine Applicable Minimum Requirements
Establish project size thresholds for the application of Minimum Requirements to new
development and redevelopment projects. Figures 2.4.1 (Attached) and 2.4.2 (Attached)
provide the same thresholds in a flow chart format. Based on the preliminary layout, determine
whether Minimum Requirements #1 through #5 apply to the project; or, whether Minimum
Requirements#1 through#9 apply.
Please note, that Minimum Requirement#1 through #5 may trigger additional Minimum
Requirements, such as Flow Control.
The total new impervious area added to this site will be 4,118 square feet and under the
5,000 square foot threshold and triggers minimum requirements 1 through 5.
1-3.1.5 Step 5 - Prepare a Permanent Stormwater Control Plan
(Refer to this section of the Ecology Manual for requirements.)
A storm water plan is provided in the developed site plan in Appendix 5. The drainage
system will be described in minimum requirement#5 below. The options for a perforated
stub out and sheet flow dispersion are discussed in Minimum Requirement#5 below.
1-3.1.6 Step 6 - Prepare a Construction Stormwater Pollution Prevention Plan (MR#2 — 13
Elements)
Refer to Chapter 11-3—Planning for a detailed description of each element. See also attached
Tables 4.1.1 (Source Control BMP's by SWPPP Element) and Table 4.2.1 (Runoff Conveyance
and Treatment BMP's by SWPPP Element).
See attached 13 Elements of a SWPPP, please complete and attached
1-3.1.7 Step 7 - Complete the stormwater site plan
The Stormwater Site Plan encompasses the entire submittal to the Local Agency with drainage
review authority. Refer to this section of the Manual for further clarification of each item and
what is required. See below:
• Project Overview
• Existing Conditions Summary
• Off-site Analysis Report
• Permanent Stormwater Control Plan
• Construction Stormwater Pollution Prevention Plan
• Special Reports and Studies
• Other Permits
• Operation and Maintenance Manual
• Declaration of Covenant for Privately Maintained Flow Control and Treatment Facilities.
(See attached Drainage BMP Maintenance Covenant BMP Agreement)
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
• Declaration of Covenant for Privately Maintained On-site Stormwater BMP's (See
attached Drainage BMP Maintenance Covenant BMP Agreement)
• Bond Quantities Worksheet, if applicable
The project overview has been provided at the beginning of this report along with an
existing conditions description. Maps are included in the attachments.
1-3.1.8 Step 8 - Check Compliance with all Applicable Minimum Requirements
A Stormwater Site Plan as designed and implemented should specifically fulfill all Minimum
Requirements applicable to the project. The Stormwater Site Plan should be reviewed to check
that these requirements are satisfied.
To take place during review and during and after construction.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 2 (MINIMUM REQUIREMENT#2)
• 1-2.5.2 Minimum Requirement#2— Construction Stormwater Pollution Prevention Plan (SWPP)
- All projects are required to complete Minimum Requirement 2.
- Refer to the 13 Elements of the SWPP (See document below, complete and attach)
- See attached Table 4.1.1, Table 4.2.1 and Table
- Provide Engineering Calculations as an attachment for Sediment Ponds\Traps, Diversions,
Waterways and Runoff/Stormwater Detention Calculations.
•
Table 4.1.1 Source Control BMP's by SWPPP Element
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Element01 Element,/ Elornents13
Preserve Esnhllsh Element Ai Element PS E lament I9 Element All Element Protect Low
BMPorEMmentNereo LtegataPktnrMerk Cor:senretWn Stabilize Protect Control Maintain Manegethe impact
Cie: inaLiras Access soh shim pal/taunts Blips Proleet Development
BNP C101: Preserving N mural Nagetolon ✓
NIP Ci02:Buffer Zones I '✓
BLIP C103:High Virlblity Phutk or Metal ✓
Fence
SUP C105: ShabllzedConstruction
Entrance!Exit
LIMP C106:IWheelNisch ✓
®MP C10T:Construction RataWPerkirg
Arse Stabllration
BHP C120:Teneareayaid Rernenent
Seeding
BNP C121: Notching ✓ +/
UP C422:Nets and Bl nhate
BHP C123:Phtatle Covering ✓
BIM C124: Sodding ✓
SUP C121:To{molling1Coalpastki
SUP C120:Poisocryter ide far Sall Erasion I
Protection •
NIP C130: Surface Roughening ✓ I
BIM C131:Gradient Terraces t/ I
S11PC1IO: dust Control +/
BMP C160: Metarb:ss On Heed se +/
SUP C151;Concrete Handling +/
BIN C152: Strmeutling and Surfacing
Poluttan Prevention
OUP C153:Materiel @elvers,Stereo Ind
Containment
MAP C1SA:Concrete Mahout Area ✓
BEIPC110:Conned Erosion and te
Sediment Control Load
IMP C152:Seh.duing f
•
Table 4.2.1 Runoff Conveyance and Treatment BMP's by SWPPP Element
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
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Lave
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LAMP C.221t. t runi1 Bather L •,.;.
Brim C23-; rir':as ei FYIt r Dettiii it
B1`ip : SI FFntn -. a'
EMP C234; Veplaisill Sttrip ,i
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R Dip 4 11 t 5-0dlLTfk Trap' ) I V
I3MP C2113 TttintifjPary Seefeneiht R id 1 ''
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13 Elements of SWPPP
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
(Construction Stormwater Pollution Prevention Plan)
Please check off boxes to show that each element has been read and understood. Provide details where
applicable and if certain aspects are unnecessary or exempt, clearly justify. Details of the 13 Elements and the
correlating BMPs are listed Above from the 2014 Stormwater Management Manual for Western Washington
(SWMMWW). A link is provided on the City of Anacortes website, under Planning, Community, & Economic
Development Department, as well as under Stormwater on the Engineering Division of Public Work's page.
Owner Name: Barb Sickler
Site Address: 4507 Queen Ann Way
Prepared By: Dale Herrigstad PE
The Stormwater checklist or building permit determined that:
❑ The 13 elements must be addressed ❑ These elements must be addressed
for construction activity adding under for construction activity adding 2,000
2,000 sq. ft. of hard surface area. sq. ft. or more of hard surface area.
This means that an attached narrative
and site plan are required with this
document.
Under each element, provide the BMP's that will be applicable to your project. Use the attached Tables
provided.
ELEMENT 1: Preserve Vegetation/Mark Clearing Limits
❑ Before beginning land disturbing activities, including clearing and grading, clearly mark all clearing
limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area.
❑ Retain the duff layer, native top soil, and natural vegetation in an undisturbed state to the maximum
degree practical.
A high visibility construction fence BMP C103 will be installed at the perimeter of the construction site
except if and existing fence already exists or were silt fence is used. BMP will be installed as first step
of construction.
BMP C233, Silt Fence will also be used to mark the south perimeter of the construction site. BMP to be
monitored daily and repaired as needed.
ELEMENT 2: Establish Construction Access
❑ Limit construction vehicle access and exit to one route, if possible.
❑ Stabilize access points with a pad of quarry spalls, crushed rock, or other equivalent BMPs, to minimize
tracking onto roads.
❑ Locate wheel wash or tire baths on site, if the stabilized construction entrance is not effective in
preventing tracking sediment onto roads.
❑ If sediment is tracked off site, clean the affected roadway thoroughly at the end of each day, or more
frequently as necessary (ex: wet weather). Remove sediment from roads by shoveling, sweeping, or
pick up and transport the sediment to a controlled sediment disposal area.
❑ Conduct street washing only after sediment is removed in accordance with the above bullet.
❑ Control street wash wastewater by pumping back on site or otherwise preventing it from discharging
into systems tributary to waters of the State.
The construction entrance will be limited to one location at Queen Ann Way with BMP C105 or C107
(Construction Entrance.)
Any dirt or mud that is tracked onto the roadway will be clean immediately.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
To be installed prior to construction. BMP to be monitored daily and repaired as needed.
ELEMENT 3: Control Flow Rates
❑ Protect properties and waterways downstream of development sites from erosion and the associated
discharge of turbid waters due to increases in the velocity and peak volumetric flow rate of stormwater
runoff from the project site.
❑ Where necessary to comply with the bullet above, construct stormwater retention or detention facilities
as one of the first steps in grading. Assure that detention facilities function properly before constructing
site improvement (e.g. impervious surfaces).
❑ If permanent infiltration ponds are used for flow control during construction, protect these facilities from
siltation during the construction phase.
A sediment trap BMP C240 is to be installed in the northeast down hill location on the property. The
design and size is shown in Element 10.
ELEMENT 4: Install Sediment Controls
❑ Design, install, and maintain effective erosion controls and sediment controls to minimize the discharge
of pollutants.
❑ Construct sediment control BMPs (sediment ponds, traps, filters, etc.) as one of the first steps in
grading. These BMPs shall be functional before other land disturbing activities take place.
❑ Minimize sediment discharges from the site. The design, installation and maintenance of erosion and
sediment controls must address factors such as the amount, frequency, intensity and duration of
precipitation, the nature of resulting stormwater runoff, and soil characteristics, including the range of
soil particle sizes expected to be present on the site.
• Direct stormwater runoff from disturbed areas through a sediment pond or other appropriate sediment
removal BMP, before the runoff leaves a construction site or before discharge to an infiltration facility.
Runoff from fully stabilized areas may be discharged without a sediment removal BMP, but must meet
the flow control performance standard in Element#3, bullet#1.
❑ Locate BMPs intended to trap sediment on-site in a manner to avoid interference with the movement of
juvenile salmonids attempting to enter off-channel areas or drainages.
❑ Provide and maintain natural buffers around surface waters, direct stormwater to vegetated areas to
increase sediment removal, and maximize stormwater infiltration.
❑ Where feasible, design outlet structures that withdraw impounded stormwater from the surface to avoid
discharging sediment that is still suspended lower in the water column.
Per BMP C233 a silt fence will be installed as noted in element 3. To be installed prior to the start of
construction. BMP to be monitored daily and repaired as needed. BMP C162 Scheduling.
ELEMENT 5: Stabilize Soils
❑ Stabilize exposed and unworked soils by application of effective BMPs that prevent erosion. Applicable
BMPs include, but are not limited to: temporary and permanent seeding, sodding, mulching, plastic
covering, erosion control fabrics and matting, soil application of polyacrylamide (PAM), the early
application of gravel base early on areas to be paved, and dust control.
❑ Control stormwater volume and velocity within the site to minimize soil erosion.
❑ Control stormwater discharges, including both peak flow rates and total stormwater volume, to minimize
erosion at outlets and to minimize downstream channel and stream bank erosion.
❑ Soils must not remain exposed and unworked for more than the time periods set forth below to prevent
erosion.
o During the dry season (May 1 — Sept 30): 7 days
o During the wet season (Oct 1 —Apr 30): 2 days
❑ Stabilize soils at the end of the shift before a holiday or weekend if needed based on the weather
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
forecast.
❑ Stabilize soil stockpiles from erosion, protect with sediment trapping measures, and where possible, be
located away from storm drain inlets, waterways, and drainage channels.
• Minimize the amount of soil exposed during construction activity.
❑ Minimize the disturbance of steep slopes.
❑ Minimize soil compaction and, unless infeasible, preserve topsoil.
Stabilize exposed and unworked soils by application of effective BMPs that prevent erosion.
Applicable BMPs include, but are not limited to: temporary and permanent seeding, sodding, mulching
and plastic covering. Install plastic covering per BMP C123 on Soils Stockpiles. BMP to be monitored
daily and repaired as needed. Refer to Table 4.1.1 in MR#2.
ELEMENT 6: Protect Slopes
❑ Design and construct cut-and-fill slopes in a manner to minimize erosion. Applicable practices include,
but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope
steepness, and roughening slope surfaces (Ex: track walking).
❑ Divert off-site stormwater(run-on) or ground water away from slopes and disturbed areas with
interceptor dikes, pipes, and/or swales. Off-site stormwater should be managed separately from
stormwater generated on the site.
❑ At the top of slopes, collect drainage in pipe slop drains or protected channels to prevent erosion.
o *Temporary pipe slope drains must handle the peak volumetric flow rate calculated using a 10-
minute time step from a Type 1A, 10-year, 24-hour frequency storm for the developed condition.
Alternatively, the 10-year, 1-hour flow rate predicted/indicated by an approved continuous runoff
model, increased by a factor of 1.6, may be used. The hydrologic analysis must use the existing
land cover condition for predicting flow rates from tributary areas outside the project limits. For •
tributary areas on the project site, the analysis must use the temporary or permanent project
land cover condition, whichever will produce the highest flow rates. If using the Western
Washington Hydrology Model (WWHM) to predict flows, bare soil areas should be modeled as
"landscaped" area.
o Where 15-minute time steps are available in an approved continuous runoff model, they may be
used directly without a correction factor.
❑ Place excavated material on the uphill side of trenches, consistent with safety and space
considerations.
❑ Place check dams at regular intervals within constructed channels that are cut down a slope.
❑ Consider soil types and its potential for erosion.
❑ Stabilize soils on slopes, as specified in Element 5.
❑ BMP combinations are the most effective method of protecting slopes with disturbed soils. Ex: Use both
mulching and straw erosion control blankets.
The site slopes with an average 15% slope and slope protection will be required. The goal would be to
not disturb the existing grass below the proposed house until the foundation is in and backfilled to
provided a stable slope.
ELEMENT 7: Protect Drain Inlets
❑ Protect all storm drain inlets made operable during construction so that stormwater runoff does not
enter the conveyance system without first being filtered or treated to remove sediment.
❑ Clean or remove and replace inlet protection devices when sediment has filled one-third of the available
storage (unless a different standard is specified by the product manufacturer).
❑ Where possible, protect all existing storm drain inlets so that stormwater runoff does not enter the
conveyance system without first being filtered or treated to remove sediment.
❑ Keep all approach roads clean. Do not allow sediment and street wash water to enter storm drains
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
without prior and adequate treatment unless treatment is provided before the storm drain discharges to
waters of the State.
❑ Inlets should be inspected weekly at a minimum and daily during storm events.
Per detail 1-40.20-00 Storm Drain Inlet protection devices will be installed at existing catch basins in the
immediate vicinity of the project.
To be installed prior to the start of any construction. Nearest CB is just west of the site in Gueen Ann
Way.
BMP to be monitored daily and repaired as needed.
ELEMENT 8: Stabilize Channels and Outlets
❑ Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the following
expected peak flows:
o *Channels must handle same peak volumetric flow rate as temporary pipe slope drains listed in
Element 6, above.
❑ Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent
streambanks, slopes, and downstream reaches at the outlets of all conveyance systems.
❑ The best method for stabilizing channels is to completely line,the channel with a blanket product first,
then add check dams as necessary to function as an anchor and to slow the flow of water.
No stormwater runoff will be conveyed off site via channels, swales, or streams.
ELEMENT 9: Control Pollutants
❑ Design, install, implement, and maintain effective pollution prevention measures to minimize the
discharge of pollutants.
❑ Handle and dispose of all pollutants, including waste materials and demolition debris that occur on-site
in a manner that does not cause contamination of stormwater.
❑ Provide cover, containment, and protection from vandalism for all chemicals, liquid products, petroleum
products, and other materials that have the potential to pose a threat to human health or the
environment. On-site fueling tanks must include secondary containment. Secondary containment
means placing tanks or containers within an impervious structure capable of containing 110% of the
volume contained in the largest tank within the containment structure. Double-walled tanks do not
require additional secondary containment.
❑ Conduct maintenance, fueling, and repair of heavy equipment and vehicles using spill prevention and
control measures. Clean contaminated surfaces immediately following any spill incident.
• Discharge wheel wash or tire bath wastewater to a separate on-site treatment system that prevents
discharge to surface water, such as closed-loop recirculation or upland land application, or to the
sanitary sewer, with local sewer district approval. Wheel wash or tire bath wastewater should not
include wastewater from concrete washout areas.
❑ Apply fertilizers and pesticides in a manner and at application rates that will not result in loss of
chemical to stormwater runoff. Follow manufacturers' label requirements for application rates and
procedures.
❑ Use BMPs to prevent contamination of stormwater runoff by pH-modifying sources. The sources for this
• contamination include, but are not limited to: bulk cement, cement kiln dust, fly ash, new concrete
washing and curing waters, waste streams generated from concrete grinding and sawing, exposed
aggregate processes, dewatering concrete vaults, concrete pumping, and mixer washout waters. Adjust
the pH of stormwater if necessary to prevent violations of the water quality standards.
❑ Assure that washout of concrete trucks is performed off-site or in designated concrete washout areas
only. Do not wash out concrete trucks onto the ground, or into storm drains, open ditches, streets, or
streams. Do not dump excess concrete on site, except in designated concrete washout areas. Concrete
spillage or concrete discharge to surface waters of the State is prohibited. Do not use upland land
applications for discharging wastewater from concrete washout areas.
❑ Obtain written approval from Ecology and provide to the City before using chemical treatment other
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
than CO2 or dry ice to adjust pH.
❑ Woody debris may be chopped and spread on site.
❑ Conduct oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel
tank drain down and removal, and other activities which may result in discharge or spillage of pollutants
to the ground or into stormwater runoff using spill prevention measures, such as drip pans.
❑ Clean contaminated surfaces immediately following any discharge or spill incident. Emergency repairs
may be performed on-site using temporary plastic placed beneath and, if raining, over the vehicle.
Per BMP C154 a Concrete Washout Area is to be installed onsite to capture contaminated water from
concrete washouts. To be installed prior to foundation / concrete installation.
BMP to be monitored daily and repaired as needed.
Contractor is to provide spill prevention kits for excavation and concrete crews are required on Site.
ELEMENT 10: Control De-Watering
❑ Discharge foundation, vault, and trench dewatering water, which have characteristics similar to
stormwater runoff at the site, into a controlled conveyance system before discharge to a sediment trap
or sediment pond.
❑ Discharge clean, non-turbid de-watering water, such as well-point ground water, to systems tributary to,
or directly into surface waters of the State, as specified in Element 8, provided the de-watering flow
does not cause erosion or flooding of receiving waters or interfere with the operation of the system. Do
not route clean dewatering water through stormwater sediment ponds. Note that"surface waters of the
State" may exist on a construction site as well as off site; for example, a creek running through a site.
❑ Handle highly turbid or contaminated dewatering water separately from stormwater.
❑ Other treatment or disposal options may include:
1. Infiltration
2. Transport off-site in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that
does not pollute state waters.
3. Ecology-approved on-site chemical treatment or other suitable treatment technologies.
4. Sanitary or combined sewer discharge with local sewer district approval, if there is no other
option.
5. Use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized
dewatering.
Li Construction equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam
can create highly turbid or contaminated dewatering water.
❑ Discharging sediment-laden (muddy)water into waters of the State likely constitutes a violation of water
quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration
and preserving vegetation.
If dewatering is needed all discharge will be directed to a temp. sed. trap BMP C240 prior to discharge
to the city storm drainage system. The sediment trap will be designed for a typical 4,118 sf impervious
area or 0.09 acres where the developed 2 year flow is 0.01 cfs X 2080 sf/cfc flow=42 sf surface area
plan or 6.5'x6.5' square surface pond area minimum.
ELEMENT 11: Maintain BMPs
❑ Maintain and repair all temporary and permanent erosion and sediment control BMPs as needed to
assure continued performance of their intended function in accordance with BMP specifications.
❑ Remove all temporary erosion and sediment control BMPs within 30 days after achieving final site
stabilization or after the temporary BMPs are no longer needed. Some temporary erosion and sediment
control BMPs are bio-degradable and designed to remain in place following construction such as
compost socks.
❑ Provide protection to all BMPs installed for the permanent control of stormwater from sediment and
compaction. All BMPs that are to remain in place following completion of construction shall be
examined and placed in full operating conditions. If sediment enters the BMPs during construction, it
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
shall be removed and the facility shall be returned to the conditions specified in the construction
documents.
❑ Remove or stabilize trapped sediment on site. Permanently stabilize disturbed soil resulting from
removal of BMPs or vegetation.
BMP to be monitored daily and repaired as needed and or as required by the City of Anacortes.
Weekly reports are required to be submitted to the building department.
ELEMENT 12: Manage the Project— Projects subject to Minimum Requirements 1-9 must have a Certified
Erosion and Sediment Control Lead (CESCL) for site inspections. Projects subject to Minimum Requirements
1-5 do not require the inspector to be certified. By the initiation of construction, the SWPPP must identify the
CESCL or inspector, who shall be present on-site or on-call at all times.
❑ Phase development projects to the maximum degree practicable and take into account seasonal work
limits to prevent soil erosion and prevent transporting sediment from the site during construction.
❑ Inspection and monitoring— Inspect, maintain, and repair all BMPs as needed to assure continued
performance of their intended function.
❑ Maintain, update, and implement the SWPPP.
❑ Clearing and grading activities for developments shall be permitted only if conducted using an approved
site development plan (e.g., subdivision approval).
❑ From Oct 1 through Apr 30, clearing, grading, and other soil disturbing activities is permitted only if
shown that the site operator will prevent silt-laden runoff from leaving the site through a combination of
the following:
1. Site conditions including existing vegetative coverage, slope, soil type, and proximity to
receiving waters.
2. Limit activities and the extent of disturbed areas.
3. Proposed erosion and sediment control measures.
Weather conditions can influence the seasonal limitation on site disturbance. The City of Anacortes has
the authority to take enforcement action per AMC 19.76 Stormwater.
❑ The following activities are exempt from the seasonal clearing and grading limitations:
1. Routine maintenance and necessary repair of erosion and sediment control BMPs;
2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or
result in the removal of the vegetative cover to soil
3. Activities where there is 100% infiltration of surface water runoff within the site in approved and
installed erosion and sediment control facilities.
BMP to be monitored daily and repaired as needed and the responsibility of the owner. Project does
not requires a certified CESCL.
ELEMENT 13: Protect Low Impact Development BMPS
❑ If implementing any bioretention facilities or rain gardens, refer to the applicable BMP sections of the
Manual for requirements.
No LID BMPS are proposed.
Dale Herrigstad P.E. June 28, 2021_
Applicant Signature Date
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 3 (MINIMUM REQUIREMENT#3)
a 1-2.5.3 Minimum Requirement#3 — Source Control of Pollution
All known, available and reasonable source control BMP's must be applied to all projects. Source
control BMP's must be selected, designed, maintained according to the reference Ecology Manual.
The intent of source control BMP's is to prevent stormwater from coming in contact with pollutants.
They are a cost-effective means of reducing pollutants in stormwater, and, therefore, should be
considered in all projects.
Single Family Residential Construction Projects and Residential Subdivisions are Exempt from
this Minimum Requirement
All Commercial Properties, Industrial Properties, and Multi-Family Properties, Boatyards, Sand and
Gravel Mining Opertations are required to comply with this Minimum Requirement.
Refer to Chapter IV-2.1 Applicable (Mandatory) Operationsal Source Control BMP's
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 4(MINIMUM REQUIREMENT#4)
• Minimum Requirement#4— Preservation of Natural Drainage Systems and Outfalls
Natural drainage patterns shall be maintained and discharges from the project shall occur at the natural
location, to maximum extent practicable. The manner by which runoff is discharged from the project site
must not cause a significant adverse impact to downstream receiving waters and down gradient
properties. All outfalls require energy dissipation.
The objective is to preserve and utilize drainage systems to the fullest extent because of the multiple
stormwater benefits these systems provide; and to prevent erosion at the downstream of the discharge
location.
Refer to the reference manual for supplemental guidelines and additional information under this
section.
Will this project disturb the Natural Drainage System or Outfall of the project Site? No.
If yes, refer to section 1.2.5.4 for Supplemental Guidelines for additional information.
No change in drainage is proposed for this site. There are limited options for this site with only
27" of soil before reaching the ground water table and no downstream drainage system. All
options in Minimum Requirement number 5 or infeasible. Splash blocks or dispersion trenches
will be used to disperse roof drainage.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 5 (MINIMUM REQUIREMENT#5)
• Minimum Requirement#5 —On-site Stormwater Management
Project thresholds that trigger Minimum Requirements#1 through #5, shall utilize the On-site
Stormwater Management BMP's from List#1 for all surfaces within each type of surface in List#1; or,
Demonstrate compliance with the LID Performance Standard. Projects selecting this option cannot use
Rain Gardens. They may choose to use Bioretention BMP's as described in.Chapter V-7— Infiltration
and Bioretention Treatment Facilities to achieve the LID Performance Standard.
Refer to this section of the reference Manual for all Feasibility or Infeasibility Criteria for List#1
and List#2.
Is this project Flow Control Exempt? No (See Appendix I-E: Flow Control-Exempt Surface Water). If
yes, provide reasoning from the applicability section of 1-2.5.7 Minimum Requirement#7: Flow
Control). If No, then the project triggers Minimum Requirement#7 (1-2.5.7) and possibly Minimum
Requirement#8 (1-2.5.8).
The flow from this site has no direct connection to a storm drainage system.
All sites are required to utilize BMP T5.13 — Post Construction Soil Quality and Depth.
For each surface, consider the BMP's in the order listed for that type of surface. Use the first BMP that.
is considered feasible. No other on-site Stormwater Management BMP is necessary for that surface.
Feasiblity shall be determined by evaluation against:
1. Design criteria, limitations and infeasiblity criteria identified for each BMP in this manual, and;
2. Competing needs criteria listed in Chapter V-5—On-site Stormwater Management.
Lawn and Landscaped Area:
• BMP T5.13: Post-Construction Soil Quality and Depth. (Attach Detail in Report)
Refer to this site for requirements and specifications. All projects are required to utilize this BMP.
http://www.soilsforsalmon.orq/pdf/Soil BMP Manual.pdf
See Appendix 3 for the "Model Soil Management Plan for BMP T5.13" to be submitted with
Drainage Report and Application Material.
An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils
Supplier that identifies the soils to be used meet the specifications outlined under Minimum
Requirement 5. The specifications are in both WSDOT and CSI Formats. For specifications, refer to
the above referenced PDF.
This submittal can be a deferred submittal since most projects are not sure who the supplier will be
• at the time of building permit application. For projects that trigger Minimum Requirements 1 through
5, the Test Report will be provided to the Building Department. Projects triggering Minimum
Requirements 1 through 9, the Test Report will be provided to the Engineering Department.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
LIST#1
Roofs: (Provide feasible detail and maintenance and operations specifications in the report)
1. BMP T5.30: Full Dispersion Feasiblellnfeasible
If infeasible, explain the criteria:
Requires native vegetation on site and there is no native vegetation on this site.
Or, T5.10A: Downspout Full Infiltration is Infeasible
If infeasible, explain the criteria:
Infiltration system require a separation from the ground water table of a minimum of 1 foot.
The water table is expected at 17"to 20" and will not provide the required separation.
2. BMP T5.14A: Rain Gardens is Infeasible.
If infeasible, explain the criteria:
Not feasible due to shallow seasonal ground water table at 17" to 20". Rain gardens require
a minimum 6" of freeboard, 6 inches of ponding depth and minimum 12" of soil depth for a
minimum 24" profile and 12" separation to the water table or 36" depth and only 20"
available.
Or, BMP T7.30: Bioretention Cells, Swales, and Planter Boxes is Infeasible.
If infeasible, explain the criteria:
Bioretention requires a similar profile to the Rain Garden with 18" soil depth and a total
depth of 42". Bioretention is not feasible.
3. BMP T5.10B: Downspout Dispersion Systems FeasiblelInfeasible
If infeasible, explain the criteria:
Downspout splash blocks or dispersion trench requires a minimum vegetated flow path of
25 feet. 78 feet is available between the house and the property line and there is no
downstream drainage system to tie a perforated stub out into. Downspout splash blocks or
dispersion trench will be used for the roof water dispersion.
4. BMP T5.10C: Perforated Stub-out Connections Feasiblellnfeasible
If infeasible, explain the criteria:
N/A.
Other Hard Surfaces: (Provide feasible detail and maintenance and operations specifications in the
report)
1. BMP T.5.30 Full Dispersion Feasiblellnfeasible
If infeasible, explain the criteria:
Requires native vegetation on site and there is no native vegetation on this site.
2. BMP T5.15: Permeable Pavements Feasible\Infeasible
If infeasible, explain the criteria:
The surface area of the driveway is 729 square feet and slopes towards the garage not
allowing any separation to the garage.
Or, BMP T.14.A: Rain Gardens Feasible\Infeasible
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
If infeasible, explain the criteria:
Rain Garden is infeasible as shown above due to shallow seasonal ground water.
Or, BMP T7,30: Biorention Cells, Swales and Planter Boxes Feasiblellnfeasible
If infeasible, explain the criteria:
Bioretention is infeasible as shown above due to shallow seasonal ground water.
3. BMP T5.12: Sheet Flow Dispersion Feasiblellnfeasible
If infeasible, explain the criteria:
Sheet flow dispersion will be used after the driveway collected and conveyed around the
house to a dispersion trench below the house.
Or, BMP T5.11: Concentrated Flow Dispersion Feasiblellnfeasible
If infeasible, explain the criteria:
N/A.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Figure 11I-3.1,7 Typical Downspout Splashblock Dispersion
House
•
LJL�LJL
Roof downspout serves 10M• - I - It It
up to 700 s.f.of roof II --111 ` IC
ill 11 14
1I- - It= Jr - IC
—I - 11— II
�1 - II II - IC
I - li It
�1 - II - II` JC
• -
I 1I If- 1L_.
II JL - 14 -.
II- - It— Jt'IC
•
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• - it II�C
II - II II.
50'min.vegetated ~'r L- �'ll - II - JC
flo pelt - IL� ]r�11
I
If 11 1C
Splashblock
11110111
Downspout extension
Splashblock
•
-14111-1-1
NOT TO SCALE
MAIM Figure Ill-3.1 .7
Typical Downspout Splashblock Dispersion
DEPARTMENT Revised December 2015
ECOLOGY Please see htfpiAwav ecy.Ha.gov/copynghf.htmlfor copyright notice including permissions,
State of Washington limitation or liability,and disclaimer_
•
2014 Stormwater Management Manual for Western Washington
Volume Ill-Chapter 3-Page 464
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Figure 111-3.1.5•Typical Downspout Dispersion Trench
level outlet
gite
pli L$
f Ci"min. Iiirint � j11
todf�
t = pat i.
le"min. ♦ s . ",- 4"pert.pipe
imawanovai
�+- 24"rain. washed rock
Trench X—Section
• small catch basin or
yard drain
slope ---.-..-i.-.
2'x 10'
level trenches
<700 sq.ft. •
. Type 1CS
700 sq.ft, standard dispersion
• trench w/notched grade
hoard length 10'per 700
sq. t.of roof area
•
•
Plan View of Roof
NOT TO SCALE
i`°`0 Figure III-3,1 .5
IMPiall Typical Downspout Dispersion Trench
DEPARTMENT OF Revised November 2015
ECOLOGY Please see http://www.ecy.wa.govlcopyright.htmlfor copyright notice including permissions,
State of Washington limitation of liability,and disclaimer.
•
2014 Stormwater Management Manual for Western Washington
Volume III- Chapter 3 - Page 461
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Figure II1-3.1.6 Standard Dispersion Trench with Notched Grade Board
./- pipe Q.D.
1'min. 1'min. now to second
dispersal trench
rend cap plugclean nutor veye from pipe
ry
G"poreorated pipelaid flat/level Type 1 CB
w/solid cover
so' A rA '
I % L�� i �a
notched grade �� influent pipe(max design
hoard 2"x 2" ��— flow s0.5 els per trench)
notches 18°O O. rd.
• Type 1 CB tr/solid
Ari
cover(locking) _
clean out wyo from pipe Flow ci aCB'
branchingC s
as necessary
Plan .
- /— pipe 0.D. .
galvanized bolts 1'min. ii 1'rain: -.4— —ol 18".O.t'. Fl--
,2,0% ,20°1u rttdK nt?A- 1� --it 2"4.+y—
•
1--:4;:tViroi,�I+/ v 2"grade 2
', ` �� • \. board notches
12"min. \ y``�`�`�,,our-. v�
36"max �vti"'/ • •w l
•• •.. , Notes:
•`,,�� 1. This trench shall be constructed so
,. 4"orb°
' m perforated pipe as to provent point discharge and/or
laid flat erosion.
2"x 12" �. 2. Trenches maybe placed no closer
pressure treated G'rain. �2 �j\*` than 50 feet to one another.(100
grade board �• feet along flotvlint?)
�� ems. s s,.�' 3, Trench and grado board must be
clean(<5%fines) level.Align to follow contours of site.
4' x 4
filter fabric 1}t"-14"washed 4. Support post spacing as required by
support post
rock soil conditions to ensure grade board
Section A- remains level.
'1!i%,max for flew contrnllwater
quality treatment in rural areas. NOT TO SCALE
ihillall Figure III-3.1 .6
Standard Dispersion Trench with
Milli" Notched Grade Board
DEPARTMENT OF Revised November 2015
ECOLOGY Please see http://www.ocy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability,and disclaimer.
•
2014 Stormwater Management Manual for Western Washington
Volume III- Chapter 3 - Page 462
Version Uate: October I, ZU1 U Nrevious Version Uate: 1-ebruary 2U, ZU1 V
II
APPENDIX 1 -Survey performed by a Professional Land Surveyor
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• TELEPHONE { 5__�SO
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HERRIGSTAD ENGINEERING & SURVEYING Topography and Boundary Survey
4320 WHISTLE LAKE ROAD An
n nn 4507 QueenWa
ANACORTES, WA 98221 299-8804y
version Date: October 1, 2U1y Previous version Date: 1-ebruary 2U, 2U19
APPENDIX 2—Soils Report
I
:1
ir eh
ii
.� '" � i " 1/ Soils
{ a / t Report
a yd,,�,, o: :8A Linda Spicher, Septic System Designer
��,'1l,�tSu s e�ae 1 License 5100294
./Ardp :� DOESiGNER f. (360)708-3004
viimmovem
Project/Client: Barbara Sickler Page / of s
Site Address: 4507 Queen Ann Way,Anacortes, WA
Parcel Number: 59240
Date on Site: 6/17/21
Map Unit, Natural Resources Conservation Service: #26 - Catla gravelly fine sandy
loam, 8 to 15% slopes
Hydrologic Soil Group: D
Soil 'Type' Loading Rate2
Soil Log 1
0—8 brown fine sandy loam 4 0.6
8— 17 tan gravelly fine sandy loam 4 0.6
17—20 tan fine sandy silt loam, roots, mottles 5 0.4
20—32 tan fine sandy silt loam, dense,
roots, mottles 6 0.2
32—48 tan fine sandy silty clay, compact,
roots to 38", slight mottles 7 not suitable
anticipated water table at 17"
Soil Log 2
0— 10 brown fine sandy loam 4 0.6
10—20 tan gravelly fine sandy loam 4 0.6
20—24 tan fine sandy silt loam, dense,
slight mottles 5 0.4
24—45 tan fine sandy silty clay, compact,
roots to 42", slight mottles 7 not suitable
anticipated perched water table at 20"
1 One of seven numerical classifications of fine earth particles and rock fragments as described in WAC
247-272A-0220(2)(e).
2 From Chapter 247-272A WAC: "Hydraulic Loading Rate"means the amount of effluent applied to a
given treatment step, in this chapter expressed as gallons per square foot per day(gal/sq.ft./day).
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- — — ‘
. HERRIGSTAD ENGINEERING & SURVEYING Topography and Boundary Survey
4320 WHISTLE LAKE ROAD
ANACORTES, WA 90221 299-8804 4507 Queen Ann Way
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
1e "
Soil Map—Skagit County ia Area, Washington
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EXPIRES 09-29-ge
Version Date: October 7, 2019 Previous Version Date: February 20 , 2019
Skagit County Area, Washington
26—Catla gravelly fine sandy loam, 8 to 15 percent slopes
Map Unit Setting
• National map unit symbol: 2hv7
• Elevation: 50 to 500 feet
• Mean annual precipitation: 21 inches
• Mean annual air temperature: 48 degrees F
• Frost-free period: 170 to 200 days
• Farmland classification: Farmland of statewide importance
Map Unit Composition
• Catla and similar soils: 95 percent
• Minor components: 5 percent
• Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Catla
Setting
• Landform: Hillslopes
• Parent material: Glacial drift
Typical profile
• H1 - 0 to 6 inches: gravelly fine sandy loam
• H2 - 6 to 11 inches: gravelly fine sandy loam
• H3 - 11 to 17 inches: very gravelly loam
• H2 - 17 to 60 inches: gravelly fine sandy loam
Properties and qualities
• Slope: 8 to 15 percent
• Depth to restrictive feature: 10 to 20 inches to densic material
• Natural drainage class: Moderately well drained
6 Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to
0.06 In/hr)
• Depth to water table: About 6 to 18 inches
• Frequency of flooding: None
• Frequency of ponding: None
• Available water storage in profile: Very low (about 1.4 inches)
Interpretive groups
• Land capability classification (irrigated): None specified
• Land capability classification (nonirrigated): 6w
• Hydrologic Soil Group: O
• Forage suitability group: Seasonally Wet Soils (G002XN202WA)
• Hydric soil rating: No s ��
Minor Components �
Coveland ! i6
• Percent of map unit: 5 percenteok
• Landform: Alluvial cones ,;; , .,
• Hydric soil rating: Yes /n' / ' ` -� i
f, +•. r
�� 'cHER
rt',.,� % `k O DESIGNER .a
>1- '. . Q9.29r
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
APPENDIX 3 — Model Soil Management Plan for BMP T5.13
An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils Supplier that
identifies the soils to be used meet the specifications outlined under Minimum Requirement 5. The
specifications are in both WSDOT and CSI Formats. For specifications, refer to the above referenced PDF.
This submittal can be a deferred submittal since most projects are not sure who the supplier will be at the time
of building permit application. For projects that trigger Minimum Requirements 1 through 5, the Test Report will
be provided to the Building Department. Projects triggering Minimum Requirements 1 through 9, the Test
Report will be provided to the Engineering Department.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
DEFERRED SUBMITTAL: PROVIDE A TEST REPORT FROM SOILS SUPPLIER TO THE BUILDING DEPT.
PROJECT INFORMATION "Model Soil Management Plan for BMP T5.13" age# of pages
Complete all information onyage 1; only site address and permit number on additional pages.
Site Address / Lot No.: .
Permit Type: Permit Number:
Permit Holder: Phone:
Mailing Address:
Contact Person: Phone:
Plan Prepared By:
ATTACHMENTS REQUIRED (Check off required items that are attached to this plan)
Site Plan showing, to scale: Areas of undisturbed native vegetation (no amendment required)
New planting beds and turf areas (amendment required)
Type of soil improvement proposed for each area
Soil test results (required if proposing custom amendment rates)
Product test results for proposed amendments
AREA# (should. match Area # on Site Plan)
PLANTING TYPE Turf Undisturbed native vegetation
Planting Beds Other:
SQUARE FOOTAGE OF THIS AREA: square feet
SCARIFICATION inches (depth) of scarification needed to achieve finished total 12" loosened depth.
Subsoil will be scarified
PRE-APPROVED inches of compost or imported topsoil applied
AMENDMENT METHOD: X 3.1 (conversion factor, inches to cubic yards) PRODUCT:
Topsoil import = cu. yards per 1,000 sq. ft.
Amend with compost X ,000s sq.ft. in this area
Stockpile and amend = cubic yards of amendment —* —+ —+ -+ — QUANTITY: CU. YDS.
( cu. yds. stockpiled) (needed to cover this area to designated depth)
CUSTOM AMENDMENT Attach test results and calculations.
Topsoil import inches organic matter or topsoil import PRODUCT:
Topsoil & compost lift X 3_1
Amend = cu. yards/ 1,000 sq. ft.
Stockpile and amend X ,000s sq.ft. in this area
( cu. yds. stockpiled) = cubic yards of amendment — --> —* - > QUANTITY: CU. YDS.
MULCH ,000 sq.ft. PRODUCT:
X 6.2 (conversion, to give 2 inch mulch depth)
= cubic yards of mulch —* -4 -> - -f -f QUANTITY: CU. YDS.
TOTAL AMENDMENT/TOPSOIL/MULCH FOR ALL AREAS (complete on page 1 only, totaling all areas/pages in this Plan)
❑ Product#1: ❑ Quantity: cu. yds.
❑ Test Results: % organic matter C:N ratio <25:1 (except mulch, or <35:1 for native plants) "stable" (yes/no)
❑ Product#2: ❑ Quantity: cu. yds.
❑ Test Results: % organic matter C:N ratio <25:1 (except mulch, or <35:1 for native plants) "stable" (yes/no)
❑ Product#3: ❑ Quantity: cu. yds.
❑ Test Results: % organic matter C:N ratio <25:1 (except mulch, or<35:1 for native plants) "stable" (yes/no)
Date: Inspector: Approved: Revisions Required:
Date: Inspector: Approved: Revisions Required:
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
APPENDIX 4— Determining Construction Site Sediment Damage Potential (Appendix 7— NPDES Phase
II Permit)
Note: See attached. All projects within the City of Anacortes are required to complete that document under
Appendix 4.
Western Washington Phase II Stormwater Permit
i. APPENDIX 7 - Determining Construction Site
Sediment Damage Potential
The following rating system allows objective evaluation of a particular development site's potential to
discharge sediment. Permittees may use the rating system below or develop alternative process
designed to identify site-specific features which indicate that the site must be inspected prior to clearing
and construction. Any alternative evaluation process must be documented and provide for equivalent
environmental review.
Step one is to determine if there is a sediment/erosion sensitive feature downstream of the development
site. If there is such a site downstream complete step two, assessment of hydraulic nearness. if there is
a sediment/erosion sensitive feature and it is hydraulically near the site then go to step three to
determine the construction site sediment transport potential.
ii. STEP 1 — Sediment/Erosion Sensitive Feature Identification
Sediment/erosion sensitive features are areas subject to significant degradation due to the effect of
sediment deposition or erosion. Special protection must be provided to protect them.
Sediment/erosion sensitive features include but are not limited to:
i. Salmonid bearing fresh water streams and their tributaries or freshwater streams that
would be Salmonid bearing if not for anthropogenic barriers;
ii. Lakes;
iii. Category I, II, and III wetlands;
iv. Marine near-shore habitat;
v. Sites containing contaminated soils where erosion could cause dispersal of
contaminants; and
vi. Steep slopes (25% or greater) associated with one of the above features.
Identify any sediment/erosion sensitive features, and proceed to step two. If there are none the assessment
is complete.
iii. STEP 2—Hydraulic Nearness Assessment
Sites are hydraulically near a feature if the pollutant load and peak quantity of runoff from the site will not
be naturally attenuated before entering the feature. The conditions that render a site hydraulically near
to a feature include, but are not limited to, the following:
i. The feature or a buffer to protect the feature is within 200 feet downstream of the site.
ii. Runoff from the site is tight-lined to the feature or flows to the feature through a channel
or ditch.
August 1, 2013, Modified January 16, 2015 Appendix 7- Determining Sediment Damage
Potential Page 1 of 3
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
A site is not hydraulically near a feature if one of the following takes place to provide attenuation
before runoff from the site enters the feature:
iv. Sheet flow through a vegetated area with dense ground cover
v. Flow through a wetland not included as a sensitive feature
vi. Flow through a significant shallow or adverse slope, not in a conveyance
channel, between the site and the sensitive feature:
Identify any of the sediment/erosion sensitive features from step one that are hydraulically near
the site, and proceed to step three. If none of the sediment/erosion sensitive features are
hydraulically near the site, the assessment is complete.
vii. STEP 3— Construction Site Sediment Transport Potential
Using the worksheet below, determine the total points for each development site. Assign points
based on the most critical condition that affects 10% or more of the site.
If soil testing has been performed on site, the results should be used to determine the
predominant soil type on the site. Otherwise, soil information should be obtained from the
county soil survey to.determine Hydrologic Soil Group (Table of Engineering Index Properties
for step 1.D) and Erosion Potential (Table of Water Features for step 1.E)
When using the county soil survey, the dominant soil type may be in question, particularly when
the site falls on a boundary between two soil types or when one of two soil types may be present
on a site. In this case, the soil type resulting in the most points on the rating system will be
assumed unless site soil tests indicate that another soil type dominates the site.
Use the point score from Step 3 to determine whether the development site has a high potential
for sediment transport off of the site.
Total Score Transport Rating
<100 Low
C 100 High
A high transport rating indicates a higher risk that the site will generate sediment contaminated
runoff.
Construction Site Sediment Transport Potential Worksheet
A. Existing slope of site (average, weighted by aerial extent): Points
2% or less .. 0
>2-5% 5
>5-10% 15
>10-15% 30
>15% 50
B. Site Area to be cleared and/or graded:
<5,000 sq. ft 0
5,000 sq. ft. — 1 acre 30
>1 acres 50
C. Quantity of cut and/or fill on site:
<500 cubic yards 0
500—5,000 cubic yards 5
>5,000— 10,000 cubic yards 10
>10,000—20,000 cubic yards 25
>20,000 cubic yards 40
D. Runoff potential of predominant soils (Natural Resources Conservation Service): Hydrologic
soil group A 0
Hydrologic soil group B 10
Hydrologic soil group C 20
Hydrologic soil group D 40
E. Erosion Potential of predominant soils (Unified Classification System): GW, GP, SW,
SP soils 0
Dual classifications (GW-GM, GP-GM, GW-GC,
GP-GC, SW-SM, SW-SC, SP-SM, SP-SC) 10
GM, GC, SM, SC soils 20
ML, CL, MH, CH soils 40
F. Surface or Groundwater entering site identified and intercepted1:
Yes 0
No 25
G. Depth of cut or height of fill >10 feet:
Yes 25
No 0
H. Clearing and grading will occur in the wet season (October 1 — May 1): Yes 50
No 0
TOTAL POINTS 90
1 If no surface or groundwater enters site, give 0 points.
i
APPENDIX 5 —Site Plan with all applicable information (Minimum Size 11x17 at a legible scale)
20' Maximum �`
curb cut width. f
INLET PROTECTI4H
HMP C22D s
WSDOT DETAIL 1-11>2B.f1U __
CB AT KINGS WAY 191�pCV 00
yyrvox �a`
14
—^~ ` BMP C1U5l167 ,n1 1
CONSTRUCTION " ..- 1_ CONNECT -\_ , --------
ENTRANCE ` �.'`1 c+ ------ROOFAND
FORM-TRAN FOOTING
FORMER 7zQ3F _ 1.0-
1� aLaci{ ' f a:1RD._ _ f DRAINS TO SD
r WALL n' SIDE
.,-----
TRENCH GRAIN FROM LOT AREAS�r� -� 1
DRIVEWAY RUNOFF CONC. }, it,3oD Sr 11
DIRECT TO DISPERSION WALL f l HOUSE AREA•3A15SF
TRENCH ct J �t�a DRIVEwAY1s DEwALK°54S sF otlslTE
HOUSE V l-Z DRNEWAY=Z248FOF I:
3,D15 3F y DECK=314SP
' TOTAL yr.
1 _ \ 51 "P.. TOTAL PERVIOUS S T.4006SF OUS 4118 F
1 HOUSE t.
L 4509 PROPOSED 1 BMP C103
11 r�• \FOOTPRT 1 BHIGHMP VISIBILITY
QUEEN �-,
1l WAY } 1 - :� FENCE AN REQUIRED
IF NO FENCE EXIST.
• `.- BMP C793
POST�NSTRUCTIONSOIL f�x SILT FENCE
QUALITY AND DEPTH ON ALL � - r ' ><'rx
t DISTURBED SOILS - x�r sq (�-
BMP C123 '�5"3 4, - ,O 4w"
TEMP.SO IL STOCKPILE 4P`��GZ O f /
COVERING WITH STRAW C, LOT 25 ` '` '
11 OR VISQUEEN&SILT _
1 FENCE AROUND SIDES. 4507 QUEEN ANN WAY- / i
\ _
—Fa y f'
11,300 Si 4. -','
55 STD6 PER C Dl" �ti \
�� UTILITY MAP Y3•%l {, \
TELEPHONE 0 `_ - �,.--
— — — PEDI5TAL � 6,14UP �A_
NoyyJ'
N$B°30'14°E r`—
�'
11
I
GRAPHIC SCALE
15 0 15 30 60
MI MI lel IIIIMENNI
( TN FEET )
1 inch = 30 ft.
HERRIGSTAD ENGINEERING & SURVEYING Erosion Control Plan
4320 WHISTLE LAKE ROAD 4507 Queen Ann Way
ANACORTES, 1IA 98221 299--8B04 July 1,2021
APPENDIX 6 - Documented Site Photos ( Show all directions of the site, including frontage)
Location •. 4507 Queen Ann Way
Description of the photo : Looking to south .
Photo taken by : Dale Herrigstad July 1 , 2021 .
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Location : 4507 Queen Ann Way
Description of the photo : Looking to south .
Photo taken b : Dale Herrisstad Jul 1 2021 .
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APPENDIX 7— Drainage BMP Facility Maintenance Covenant
Note: To be recorded prior to: 1) Temporary Certificate of Occupancy; 2) Final Certificate of Occupancy, and
or; 3) Final Acceptance of the project.
This is Covenant is required for any Permanent Stormwater Facility constructed on a project site. The applicant
should work with the the City of Anacortes Engineering Department on formalizing the document for recording.
W
EROSION CONTROL NOTES
A. IF A CERTIFIED ER❑SI❑N AND SEDIMENTATI❑N CONTROL SUPERVIS❑R (ESC) IS REQUIRED. Q
THE ESC SUPERVISOR MUST HAVE ATTENDED A CERTIFIED EROSION AND SEDIMENTATION
CONTROL CLASS WITHIN 3-YEARS FROM T❑DAY'S DATE. MUST PR❑VIDE CERTIFICATI❑N
GA
B. THE CERTIFIED EROSION AND SEDIMENTATION CONTROL SUPERVISOR WILL OVERSEE AND
BE RESP❑NSIBLE FOR ALL ER❑SI❑N CONTROL. THE FACILITIES SHALL BE INSPECTED DAILY
AND MAINTAINED TO ENSURE PROPER FUNCTI❑NING. WRITTEN RECORDS SHALL BE KEPT
OF WEEKLY REVIEWS AND AFTER EVERY SIGNIFICANT STORM EVENT OF THE ESC FACILITIES
DURING THE WET SEASON (❑CT❑BER 1 TO APRIL 30). MONTHLY REVIEWS DURING THE
DRY SEASON (MAY 1 TO SEPTEMBER 30), WRITTEN RECORDS SHALL BE TURNED INT❑ THE z
PROJECT MANAGER OR INSPECT❑R ON A WEEKLY BASIS AT THE WEEKLY SCHEDULED O
PROJECT MEETINGS, ll
C. ER❑SI❑N CONTROL MEASURES SHALL BE IN PLACE PER THE APPROVED SET OF PLANS
PRIOR TO ANY CONSTRUCTION START. W
I4
INLET PROTECTION D. THE ER❑SI❑N CONTROL SHALL BE INSPECTED ONCE A DAY AND M❑DIFIED TO MEET THE
BMP C220 — SURR❑UNDING C❑NDITI❑NS AS NEEDED. C..5 -71
WSDOT DETAIL I-40-20,00 C154 PSN6�� E. PR❑VIDE A SIGN DISPLAYING A 24-HOUR CONTACT NUMBER AND NAME OF THE ESC co
CB AT KINGSWAY MP �C SUPERVIS❑R. THE LETTER SIZE SHALL BE A MINIMUM OF 2-INCH LETTERS. THIS SHALL BE �+
B— ,ROE C1 SING IN PLACE PRIOR TO CONSTRUCTION START. REMEMBER, THE LOOK OF THE SIGN WILL BE A C�
/ ' CON N SIR�O XIS REFLECTI❑N OF THE CONTRACTOR, DEVELOPER AND DEVELOPMENT.
F. THE STORM DRAIN SYSTEM AND EXISTING DITCHES SHALL BE CLEANED DAILY (SECTION 7- fl,
`' IDS �pQ 07,3), ALL DRAINAGE SYSTEMS SHALL BE CLEANED TO THE ACCEPTANCE OF THE CITY OF 7j coo
P SO w 01\- 06 / ANAC❑RTES PRI❑R TO THE ACCEPTANCE OF THE PROJECT. w Cv
P\`�� PCB �F 10 0`w;11�5 � \ G. STABILIZED CONSTRUCTION ENTRANCES AND ROADS SHALL BE INSTALLED AT THE BEGINNING p1, C
�� F NO PpZN OF C❑NSTRUCTI❑N AND MAINTAINED DURING THE DURATI❑N OF THE PROJECT. ADDITI❑NAL C1
Q NZ MEASURES MAY BE REQUIRED SUCH AS WASH PADS TO ENSURE THAT ALL PAVED AREAS ARE Q
BMP C105/107 • �n� "�' \ KEPT CLEAN. NO MUD IS ALLOWED TO ENTER ONTO CITY STREETS. cc
— CONSTRUCTION 0�0� CONNECT 1 \ U H. ANY S❑ILS EXP❑SED THAT WILL N❑T BE DISTURBED F❑R TW❑ (2) DAYS DURING THE WET - C�
ENTRANCErRANS R�159p , ROOF AND SEASON OR SEVEN (7) DAYS IN THE DRY SEASON SHALL BE IMMEDIATELY STABILIZED WITH Q_5
vollik
FORMER � 6 *35'02�I 0_ FOOTING APPROVED ESC METHODS (SEEDING, MULCHING, PLASTIC COVERING, ETC,) 'j w
�=2 ' DRAINS TO \ FENCE x X X X X X I. TWO (2) WEEKS PRI❑R TO THE BEGINNING OF THE WET SEASON (❑CT❑BER 1), ALL DISTURBED ~++ x
BLOCK CONC. % \ \ AREAS SHALL BE REVIEWED T❑ IDENTIFY WITCH ONES CAN BE SEEDED IN PREPARATION FOR
�j =
WALL lk
' 105 SD SIDE GAS G G THE WINTER RAINS. DISTURBED AREAS SHALL BE SEEDED WITHIN ONE (1) WEEK OF THE 4 x624
BEGINNING OF THE WET SEASON. A SKETCH MAP OF THOSE AREAS TO BE SEEDED AND THOSE
TRENCH DRAIN FRO" LOT AREAS UNDERGROUND
AREAS TO REMAIN UNCOVERED SHALL BE SUBMITTED TO THE PROJECT MANAGER. THE PROJECT W O
— I DRIVEWAY RUNOFF CON(, , 11,300 SF UGP UGP MANAGER CAN REQUIRE ADDITIONAL AREAS IN ORDER TO PROTECT SURFACE WATERS, ADJACENT ;� C\2
H❑USE AREA = 3,015 SF POWER PR❑PERTIES ❑R DRAINAGE FACILITIES. C'D Z
DIRECT TO WALL •
100 DRIVEWAY/SIDEWALK = 505 SF \ Q
DISPERSION TR ► \ , 2 ON-SITE J. PENALTIES FOR AN EROSION CONTROL VIOLATION ARE SUBJECT TO A $300 TO $1,000 FINE
DRIVEWAY = 224 SF OFF-SITE \ SANITARY —ss ss UNDER CHAPTER 17.66 - PENALTIES FOR VIOLATION (AMC). EACH DAY IS CONSIDERED
A DIFFERENT VIOLATION.
HOUSE o DECK = 374 SF SEWED W
1 TOTAL IMPER E.VIOUS = 4,118 SF REMOVE ALL TEMPORARY EROSION CONTROL MEASURE WHEN THE SITE IS LANDSCAPED AND SOILS ARE
\ 3 015 SF _ STORK STABILIZED.
- - S E O TOTAL PERVIOUS 7,406 SF SD SD
4509 d PROPOSED HIGH VISIBILITY SEWER ALL DEWATERING SHALL DISCHARGE INTO A SEDIMENT TRAP OR SEDIMENT POND.
FOOTPRINT \7
\
QUEEN - i FENCE AS WATER THE CONTRACTOR IS TO PROVIDE TO THE CITY INSPECTOR THEIR SPILL PREVENTION PROGRAM TO BE INPLACE
ANN
,� \ ,�
REQUIRED IF NO \ N AIN w w DURING CONSTRUCTION.
WAY W C� 3� 4 S FENCE EXIST,
Power Vault P
BMP T5.13 Catch Basin
POST-CO '1 11 _ BMP C233
SOIL QUALITY ANDA
Sanitary Sewer Clean Out °
/X SILT FENCE 0 x Sanitary Sewer Man Hole
DEPTH ON ALL X/ NON
1 DISTURBED SOILS � ic\ 1R PIS z
i Caole Pec Tco
BMP C123 /X�ISP,RSSE_ �,IINP�E Fire Hyorant CZ
TEMP, SOIL STD" KPILE 53 �� �E\IO �pF �RF 7 /z� Water Gate Valve D4
COVERING WITH - �P NE�� V Water deter ® �, ,�
STRAW OR VISQUEEN ��N LOT 5 �° �' °'
741 crio
& SILT FENCE AROUND
\ SIDES. 4507 QUEE\ A ► \ „;, z,
\ -
P59L40 \�z
11s : s 0Y
CITY UTILITY rL'`2\3 P6,
1 MAP 1Pti�� \ N oan.) -- —'�
N E.
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PEDISTAL �j2Z �o�'�J
N 89°30'14" E/, , - -- \ O
i
GRAPHIC SCALE
20 0 10 20 40 80 CONSTRUCTION SCHEDULE
1. Install BMP C105 Construction Entrance, BMP C233 Silt Fence, BMP C103 High Visibility
( IN FEET ) Construction Fence and catch basin sock inserts.
1 inch = 20 ft. 2. Install BMP C154, Concrete Washout Basin.
3. Excavation of' foundation.
4. Install footings, foundation and utilities.
5. Backfill foundation and add additional BMP's to minimize Sediment transfer and erosion.
6. Install dispersion trench. Protect infiltration trench from sediment until site is stabilized.
7. Construct home with gutters and connect to dispersion trench. r 1
8. Connect to driveway as soon as concrete pavement is in place. CD
9. Installation of' BMP T5.13 Post Construction Soils and landscaping.
CilD
n 1
This plan sheet is accepted for construction in accordance with the
CONSTRUCTION STANDARDS \L, HE RR City of Anacortes ordinances and policies. Actual conformance of the SHEET NO.
of wAsy jCd, design with applicable laws is the sole responsibility of the
.F- 4' 2 professional engineer, whose name and stamp appear on this sheet.
ALL IMPROVEMENTS IN CITY RIGHT-OF-WAY SHALL BE CONSTRUCTED TO THE CURRENT WSDOT qV "- r' d Acquiring, complying with, and providing mitigation for all Federal, C 1
SPECIFICATION AND CURRENT CITY OF ANAC❑RTES ENGINEERING STANDARDS. i State, County, and Local Laws, permits, and mandates, including but
"` 0 not limited to the Endangered Species Act, Federal Wetland Permit,
14 , State Department of Fisheries Hydraulics Permit, Federal Flood Plain REV.: —
Q- Permits, National Pollutant Discharge Elimination System Permits is
''„ ,i,,,- 780R�o << g y JOB NO: 2021-106
S 0 I L AMENDMENT NOTE FSSCNAL ENG\� The issuance the responsibility
lof this the
permit shallr,not Landowner,
construed as their Engineer. y
PproofDATE: Jul 2021
compliance with applicable laws and permit requirements.
SCALE: Noted
BMP T5.13: POST CONSTRUCTION SOIL QUALITY AND DEPTH. July 1, 2021 DRAWN: D. HERRIGSTAD
SEE APPENDIX OF DRAINAGE REPORT FOR SPECIFICATION ON PROVIDING SOIL AMENDMENTS FOR ALL
DISTURBED SOILS OUT SIDE OF IMPERVIOUS AREA AROUND BUILDING AND PAVED AREAS. CITY ENGINEER DATE CHECK: D. HERRIGSTAD
The acceptance will expire one year from the date
noted above.
SHEET_1 _OF_ _
w
Figure 11-4.1.1 Stabilized Construction Entrance
BMP C107: Construction RoadlParking Area Stabilization Figure 11-4.1.7a Concrete Washout Area w
Figure III-3.1.5 Typical Downspout Dispersion Trench
NOT TO SCALE Purpose
—lia-- 3m Minimum -a—
1
evel outlet
Stabilizing subdivision roads, parking areas, and other on-site vehicle transportation
doi.-.•....•-.gel'.
routes immediately after grading reduces erosion caused by construction traffic or runoff. Lath and flagging ,�.* *•.�.*.,
Q ( ) O on 3 sides •�;���.���'.�•�f.�•
Conditions of Use ^� Sandbag \�
a \! Berm Sandbag .•..E�iP;• ar,• ••r•
�X\5�rc3R° ,� �g� Roads or parking areas shall be stabilized wherever they are constructed, whether per-O.
t — plastics"mm. w
10 mil linings•.�l�f���•,��
e
�; JIr-� manent or temporary, for use by construction traffic.
..,.��.�
..+.,rt�..,� � Varies _ A U A
18"min. • .. .-.i
.fie�i \ ...'r• • �• P P
�,.-�. 03
;-,•,r-gar. . High Visibility Fencing (see BMP C103: High Visibility Fence (p.269))shall be o /}- 0
,.,,., ;. .,,,;�.� �...
��s ��a ��-•�s installed, if necessary, to limit the access of vehicles to only those roads and park- --volt•4"teig H
CO
�111024 , 1410 04t ~ %' % '� Berm h+•— 24"min. —4.-1 washed rock
,.��,.�,. ,. � ing areas that are stabilized.
/����/ �'��i'v��i'r,�i �ir�i�ir.. 100'min.
. X-rw,_1,r_�*�R�s *r Design and Installation Specifications
o O O c 0 0 ''
''� ���"���+�~�+� Section A-A
Trench X-Section w
�Tw��� " �rtiz.*f• �ti"+�.. 10 mil plastic lining
,s,\��j•,jj�,jj,,jj•. ,�. Plan Notes: �-�
*1�!f�*-*'-'*�` *Y- . On areas that will receive asphalt as part of the project, install the first lift as soon 1. Actual layout o
c� �� possible. small catch basin or 124
Install driveway �ii.�i,�i■►,�ii� �,�\
culvert if there is a � � * � t as determined in the field.
Type "Below Grade" 2. A concrete washout yard drain ~ C�
roadside ditch present 4"-g"quarry `�R� ��ir 'R, � �ii, slope-�._ r�J
sign shall be installed ��
spar ` �� :� ,��,11; • A 6-inch depth of 2-to 4-inch crushed rock, gravel base, or crushed surfacing base within 10 m of the
p� p
�r!*'*�*�*'*w� 3m Minimum temporary concrete 2'x10' �'
� f � � �� course shall be applied immediately after grading or utility installation. A 4-inch washout facility. level trenches Q�;�+��� � � � course of asphalt treated base (ATB) may also be used, or the road/parking area 700 Geotextile 's!� � � � � x
may be paved. It may also be possible to use cement or calcium chloride for soil B Wood frame Type 1 CBE—I
•,• • •'•�•, B securely fastened
�._ ��� stabilization. If cement or cement kiln dust is used for roadbase stabilization, pH around entire
Y�••*•*•�;•� perimeter with two >700 sq.ft. w
�:.x : '.% monitoring and BMPs (BMP C252: High pH Neutralization Using CO2 (p.409)and 1A11 stakes P
standard dispersion_ Varies10 mil trench w/notched grade
'�''�'"'*� BMP C253: pH Control for High pH Water(p.412))are necessary to evaluate and board length 10'per 700 �+ w
'a,,` plastic lining bo.rd a rgth areaminimize the effects on stormwater. If the area will not be used for permanent
Notes: 15'min. \\/\/\/ /\/\/\/
1. Driveway shall meet roads, parking areas, or structures, a 6-inch depth of hog fuel may also be used,
12"minimum thickness Stake t 44
`�� O
the requirements of the (yp) \
permitting agency. but this is likely to require more maintenance. Whenever possible, construction Section B-B w w o U
roads and parkingareas shall be placed on a firm, compacted subgrade.
2. It is recommended that Provide full width 10 mil plastic lining
the entrance be of ingress/egress Two-stacked Plan View of Roof
y road gradients shall not exceed 15 percent. Roadways shall be care- wood frameouge Plan
crowned so that runoff area • Temporary
drains off the pad. wood
fully graded to drain. Drainage ditches shall be provided on each side of the road-
44
way in the case of a crowned section, or on one side in the case of a super- Type "Above Grade" with Wood Planks
■,ACII elevated section. Drainage ditches shall be directed to a sediment control BMP. NOT TO SCALE
MINOT TO SCALE
IlirWa Figure 11-4.1 .1 . Rather than relying on ditches, it may also be possible to grade the road so that run-Stabilized Construction EntranceFigure II-4.1 .7a ��
offsheet-flows into a heavily vegetated area with a well-developed topsoil. Land- Figure 111-3.1.5
IMPRI
DEPARTMENT OF Revised June 2015 scaped areas are not adequate. If this area has at least 50 feet of vegetation that Concrete Washout Area Typical Downspout Dispersion Trench
ECOLOGY water can flow through, then it is generally preferable to use the vegetation to treat DEPARTMENT OF Revised June 2015
Please see hability,and disclaimer.
opyright.html for copyright notice including permissions, ECOLOGY DEPARTMENT O F Revised November 2015
State of Washington limitation of liability,and disclaimer. runoff, rather than a sediment pond or trap. The 50 feet shall not include wetlands Please nee liabi/ty,and disclaimer.
opyright.html for copyright notice includingECOLOGY
permissions,
State of Washington limitation of liability,and disclaimer. Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
or their buffers. If runoff is allowed to sheetflow through adjacent vegetated areas, it State of Washington limitation of liability,and disclaimer.
is vital to design the roadways and parking areas so that no concentrated runoff is
created.
co
2014 Stormwater Management Manual for Western Washington
c\z
2014 Stormwater Management Manual for Western Washington 2014 StormwaterManagement Manual for Western Washington
Volume ll- Chapter 4 -Page 2732014 Stormwater Management Manual for Western Washington C
Volume 1l- Chapter 4 -Page 277 Volume ll- Chapter 4 -Page 322
Volume III- Chapter 3-Page 461 , ,
0
Figure 11-4.2.12 Silt Fence Figure 11-4.2.16 Cross Section of Sediment Trap �+
Figure 11-4.2.17 Sediment Trap Outlet W �+
Figure I11-3.1.6 Standard Dispersion Trench with Notched Grade Board = .
Joints in filter fabric shall be spliced
at posts.Use staples,wire rings or
equivalent to attach fabric to posts pipe O.D.
2"x2"by 14 Ga.wire or equivalent, a
if standard strength fabric used �- 1'min. 1'min. Flows second
�!��m. ►+� end cap or plug dispersal trench
►0ii ri
•.i�iiiii�i�iii0.Oi00ii�i�i�i•�iO�i■r�■■■ ■ �, /� ^� if necessary
��•��� t�•�•����•�������•�'i�i0•i�ii�i'i'i�i'i'i�0i'i❖•ice■■■=_■_ clean out wye from pipe�iO�i• iii•i�•iiiii�i•Oi�iii�iiii�ii�O��ii�ii,���II 4"or 6" erforated I
.•O�� •ii900•i�0•i�i•iiiii�i�i•Oi�i�Oiiiii��i'i■��■■III - r p pipe n
000 O❖pO�..�pp0•ppOp•O��.p••❖•�O••Oi'�� ■ �� laid flat/level Type 1 CB � �®/
•••� ••�i�i•Oiii�ii••iii�i00�iiO•i0� 'iiii��i ■� w/solid cover
�i�ii�i�ii•0i•OiiO•i�iii�ip%%%••��%i�%%r%%%�♦i ►III r 50' II'� SI*!?&
iiitti:Ii�0•�ii'i�i�i� �1 ■E A % A�•.•Ji�••�•��e�.-e�IV,. -�
/\\��i� / /�� �•� / / notched grade �� influent pipe(max design
—_ _I I \.. , \ \\,�\ �\ \\�\\�\\L\�\\��\ r��\ board 2"x 2" Ilim� flow<0.5 cfs per trench
I r Surface area determined notches 18"Q.C. )
Minimum I 6'max Iat top of weir4'Min` {I4"x4"trench I wl I1'Min. I ,r_ _ _ _ TOverflow 6'Min. r.l Type 1 CB w/solid
u _� 1 Mm. I I Il l I— I I=1 �I l cover(locking) ..
_ 1'Min.depth overflow spillway i i1 I l-1 I�I I I=1 I I=III-
Post spacing may be increased 0S. III—I I I I I IIII-1 I I II I I-III—III—I I I�I I-III- clean out wye from Flow to other
to 8'if wire backing is used 2 x2 wood posts,steel •iL 3 5'-5' 1 1'Min. ��I I �• • • .,• • • • • • i• • • • • I I I y prpe branching CB's
fence posts,or equivalent 'Li T 1 I 11•`� 4•C •'•`0 • i:C4 • •is • 0 r - i= Plan as necessary
df 1.5'Min. IT i� F
C
Flat Bottom _ IIIIIIIIIIIIIIIIIIIP_ _ Min. 1'depth 2"-4"rock
3/' 1.5" I-I 11=1 I IE I I—I I—I 11=III—I I I�I EI I I=I pipe O.D.
Washed gravel toNative soil or -III=III=II IIIIIII=III=III=II Min. 1'depth%a" -1.5"
2"x2"by 14 Ga.wire or equivalent, Note:Trap may be formed by berm or byGeotextile stabilizedcompacted backfill washed gravelgalvanized bolts 1'min. 1 min. 18"O.C. 1-.4—
Dischargeif standard strength fabric used conve Geotextile
partial or complete excavation. yance, o row(
2"-4"Rock "20/° —...12 I-r--
outlet,or level
%\� Filter fabric Rip Rap spreader �a/o max
\//\ 17-'*-;/A
■1 j/ 2"grade
I
2'min ,1111
12"mi . \\ \\� iboard notches36"max ✓iiij Backfill trench with �i/ Notess � "� �' / 4"or 6" 1• This trench shall be constructed so
native soil or/"- // �'' as to revent
44
1.5"washed gravel ����/\ \ �� � perforated pipe p point discharge and/or
\/12"mmVA/AAjAA/ ' laid flat erosion.
Minimum ����\,�VA��V/AA�/ 2"x 12" �� ,7,� 2. Trenches may be placed no closer
4"x4"trench 1 pressure treated 6'min. .� / �; than 50 feet to one another.(100
grade board T gr, .,,\ /�j� feet along flowline)
1 3. Trench and grade board must be
C clean(55%fines) level.Align to follow contours of site. }
2"x2"wood posts,steel 4"x 4" 1 yz" /a washed 4. Support post spacing as required by p 1-filter fabric a
ence posts,or equivalent
NOT TO SCALE NOT TO SCALE
support post rock soil conditions to ensure grade board
Section A-A
NOT TO SCALE '15%max for flow control/water remains level.
quality treatment in rural areas.
�rIEMI NOT TO SCALE C
Figure I I-4.2.12 MIN S..►
Figure 11-4.2.16 Figure II-4.2.17 r► Figure III-3.1 .6
Silt Fence ling Cross Section of Sediment Trap Sediment Trap Outlet Sta
WOOS ndard Dispersion Trench with
DEPARTMENT OF Revised October 2014 DEPARTMENT OF Revised November 2015
ECOLOGY ECOLOGY DEPARTMENT OF Revised November 2015
Notched Grade Board
Please see http://www.ecy.wa.gov/copynght.html for copyright notice includingECOLOGY DEPARTMENT O F SHEET NO.
15
permissions, Please see http://www.ecy.wa.gov/copynght.hfm/for copyright notice including permissions, ECOLOGY Revised November r2mis
C2
State of Washington limitation of liability,and disclaimer. Please see hitp:/Iwww.ecy.wa.gov/copyright.hfml for copyright notice including permissions,
State of Washington limitation of liability,and disclaimer. Please see hftp://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability,and disclaimer.
State of Washington limitation of liability,and disclaimer.
A
ip
ffAR�1/,o , REV.: -
Gpce c -F:i \ JOB NO: 2021-106
2014 Stormwater Management Manual for Western Washington •' DATE: July 2021
2014 Stormwater Management Manual for Western Washington 2014 Stormwater Management Manual for Western Washington
Volume ll- Chapter 4 -Page 369
Volume ll- Chapter 4 -Page 386 Volume II- Chapter 4 -Page 387
2014 Stormwater Management Manual far Western Washington 27807 SCALE: Noted
/°� RFotsTER�° ��'
Volume III- Chapter 3 -Page 462 Fss/o�L EN��� DRAWN: D. HERRIGSTAD
CHECK: D. HERRIGSTAD
July 1, 2021
SHEET____OF_2_