HomeMy WebLinkAboutPermit File BLD-2023-1506 820 23rd Street 4, City of Anacortes, WA
904 6th Street
Anacortes, WA 98221
(360)293-1901
-I C O http://cityofanacortes.org/
B DD-2023-1506 RESIDENTIAL REMODEL
PROJECT NAME: HOUSE MOVING AND ADDING A FOUNDATION. ISSUED: 01/26/2024
SITE ADDRESS: 820 23RD ST ANACORTES EXPIRES: 07/26/2025
PARCEL: P58083
LEGAL DESCRIPTION:
APPLICANT: Mceowen, Kate OWNER: MCEOWEN KATE L
1004 Commercial Avenue, Pmb 2002 PMB 2002
Anacortes,WA 98221 ANACORTES,WA 98221
2069621545
VALUATIONS: FEES: Paid Due
Estimated construction cost 100000.00 $100,000.00 Building Permit Fee $993.75 $0.00
Plan Application Fee $200.00 $0.00
SFR or duplex site plan review $60.00 $0.00
State Building Code Council fee $6.50 $0.00
Plan Review Fee $645.94 $0.00
Storm Water Review Sq Ft $137.04 $0.00
Mechanical and plumbing $15.00 $0.00
remodel fixtures fees
Total: $100,000.00 Totals : $2,058.23 $0.00
FIXTURES
City Plumbing Fixtures
REQUIRED INSPECTIONS
Initial BMP's Plumbing Rough-In
Footings Framing
Sewer Line Insulation
Foundation Wall Cross Connection or backflow assembly verified
Storm Drain Connection Building Final
Perimeter Drains Stormwater Final
Stormwater
Printed by:Cheri Gleichmann on:02/05/2024 08:43 AM
Page 1 of 2
4, City of Anacortes, WA
RESIDENTIAL REMODEL BLD-2023-1506
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For inspections, please call (360)293-1901
Printed by:Cheri Gleichmann on:02/05/2024 08:43 AM
Page 2 of 2
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Storm Water Drainage Report
° Minimum Requirements 1 through 5
Minimum Requirement 1 through 9
�0 ENGINEERING DEPARTMENT
904 6tn Street Anacortes, WA 98221
www.anacorteswa.gov
Official Use Only: (Information to Inspectors)
Required Storm Water Facility and other related requirements:
k^
Project Address: szo 23rd street Submittal /�4 t23 "
Parcel Number: P58083 Revision urri '
Permit Number: 3LD- - 5 Reviewer: �., ��fi, '�"holt
Acceptance Date'
FRONT OF REPORT: Stormwater Mavis
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 TAB 6: Minimum Requirement#6- Runoff Treatment
o TAB 7: Minimum Requirement#7- Flow Control
o TAB 8: Minimum Requirement#8-Wetland Protection
o TAB 9: Minimum Requirement#9-Operation and Maintenance
o APPENDIX 1 - Survey performed by a Professional Land Surveyor
o APPENDIX 2 - Soils Analysis (Volume 1, Chapter 3.1.1)
o APPENDIX 3 - Model Soil Management Plan for BMP T5.13
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.
o APPENDIX 8 - Maintenance and Operations Manual
Stormwater Management Requirements:
o Refer to the 2019 Department of Ecology Manual
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: August 30, 2022
Project Description and Summary:
Summary Table
Existing Proposed
Development Type Single Family Residential Same
Number of Lots 1 Lot Same
Lot Acreage in SF 5,996sf Same
Soil Type(s) Bow-Urban land complex, USGS Soil Survey
Site Sediment Transport Score (High\Low) Low
Depth to Ground Water Table (Feet and Inches)
See completed Soils Analysis Volume 1, Chapter 3.1.1
Infiltration Rate during Rainy Season Inch\Per Hour
Imperious Surface (on-site) 1,713sf 1,828sf
Impervious Surface off-site N/A
New and Replaced Hard Surface Total SF 115sf 115sf
Lot Coverage (Percentage) 18% 22% 18°io 22%
BMP (Required Minimum Requirement 5) BMP T5.13 Post Construction Soils
Water Quality Method Minimum Requirement 6 BMP C121 Mulching, BMP C123 Plastic Covering
Water Quantity Method Minimum Requirement 7 BMP C220 Inlet Protection (As Required)
Existing Site Conditions Summary:
(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)
Existing home on property to be moved approximately 10ft towards 23rd Street. Front porch deck to be replaced. Side and rear deck to be replaced.
Some rerouting of wet utility service lines.
There are no major fill and grades associated with this project. Existing grade shall be kept the same.
There are no steep slopes or critical areas in this developed neighborhood.
Developed Conditions Summary:
(Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard
surfaces , proposed contours)
See site plan for this information.
Drainage Basin (2007 Storm Comp Plan — City website\publicworks\engineering\comprehensive plans):
What Drainage Basin are you in? F03 Identify any downstream drainage issues (Storm Comp Plan:
None If so, describe:
Complete the Applicability Requirements— Flow Chart (See next page(s)
- Highlight the path and attach
Version Date: August 30, 2022
Start Here
Does the Site have 35% Yes w See Redevelopment Project
or more of exlstlng hard
Thresholds and the Figure 7-7oi
Chad 1"or Detersnorung
surface coverage? Requirements for Radcwelopment",
No V
Does the Pro,lect coiriver0/4
acres or more of vegetation to
Does the Project result in lawn or landscaped areas, or
5,00,0 square. feet, or No convert 2.5 acres or more of
greater, of new plus Jo native vegetation to pasture?
replaced hard surface
area?
Yes// 4
Yes Does the Project result In 2,000
it square feet, or greater, of new plus
All MInIrTium Requirements replaced hard Surface area's
apply to the new and replaced
hard surfaoas and converted
vegetation areas.
Does the Project �'iave land
Minimum Requirements #1 disturbing activities of 7,000
through #5 apply to the, new square feet or greater?
and replaced hard surf Ve$aces
and the land disturbed. No V
MinImum Requirement#2
applies.
Flow Chart for Determining Requirements for
New Development
DEPARTMENT OF Revised March 2019
ECOLOGY
for copyright riot1ce Inch,01rig r*rmisslons,
JLIL�ashington 11m1ration of 11abIlIty,Anel dKdalime(,
Version Date: August 30, 2022
Does the Project result In 2,000 square feet, or more, of new plus replaoed hard surface area?
OR
Does the land disturbing activity total 7,000 square feet or greater?
Yes No V
Minirrium Requirements #1 through #5
apply to the new and replaced hard Minimum Requirement#2 applies.
surfaces and the land disturbed,
Next Question
Does the Project add 5,000 square feet or more of new hard surfaces?
OR
Conveil'14 actes or rnore of vegetatlonto lawn or larldscaped areas"
OR
Currvert 2,5 acres or More of native vegetation to pasture?
� Yes I No
All Minimum Requiroments aPPIY Next Question Is this a road
to the new hard surfaces and the 00 1 9 .......... No
converted vegetation areas. related project,
� yes
Does the Project add 5,000 square feet or riture of new fiard surfaces?
Yes Is tars total of new pki repl s ace ct har urf4c
d ses 5,,000
4 No square feet or rnore,
Do ffie riew hard IF AND
drwa the valan of the prnpasod Improvements-
more to
,%,sifaces add existing 50% or No additional No IncludIng Interior Improvements-exceed 50%of the
the
hard surfaces wlthl,ni requirements. assessed valkie(or rod placerient v'alues)of the:
the Site? 0 "XIsting Frojea Site Irnprovenients(for,
comn'lerdal of InitistrIal proji W—tr)OR,
# existling Site lrnprovernelAs(for all other projec-1-S)
........................
All Minimum Requirements apply to the new=nd replac�ed
Yes 14
hard surfaces and converted vegetation areas. Yes
Flow Chart for Determining Requirements for
Redevelopment
ReAsed VArch 2019
DEPARTMENT OF
ECOLOGY r,for cr4)yrJ9ht rrotlrA Indtoilrig porn 1,sloes,
State of Washington liniltato of llawllty,anci cilsclafrnw,
Version Date: August 30, 2022
13 Elements of SWPPP
(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 2019 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: Kate McEowen
Site Address:820 23rd Street
Prepared By: Seth Allen-Allen Design &Drafting-alien.design.drafting@gmail.com
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
See also site plan A0.1 for 13 elements 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.
Suggested BMPs for Element 1:
• BMP C101: Preserving Natural Vegetation
• BMP C102: Buffer Zones
• BMP C103: High-Visibility Fence
• BMP C233: Silt Fence
How did you comply with this section?
The project site and surrounding properties are developed. Proposed work is to occur in the south half of the property.
There is no natural or planted vegetation of significatnce in this area.
Due to the compact nature of the work area it isn't feasible to identify areas where construction activities shall not occur.
There are no BMP's selected for this element.
Version Date: August 30, 2022
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.
Additional Guidance for Element 2
Minimize construction site access points along linear projects, such as roadways. Street washing may
require local jurisdiction approval.
Suggested BMPs for Element 2:
• BMP C105: Stabilized Construction Access
• BMP C106: Wheel Wash
• BMP C107: Construction Road / Parking Area Stabilization
How did you comply with this section?
The existing gravel driveway located in the northwestern corner of the property has been designated as the construction entrance
as the construction entrance on the project site plan. The contractor shall ensure that all sediment from onsite shall be cleaned off
before entering the public roadway. See the project site plan Element 2 for additional responsibilities and sediment mitigation
measures that the Contractor or CESCL must follow or may employ.
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.
Version Date: August 30, 2022
Additional Guidance for Element 3
• Conduct a downstream analysis if changes in flows could impair or alter conveyance systems,
streambanks, bed sediment, or aquatic habitat. See III-3.2 Preparing a Stormwater Site Plan for off-site
analysis guidelines.
• Even gently sloped areas need flow controls such as BMP C235: Wattles or other energy dissipation /
filtration structures. Place dissipation facilities closer together on steeper slopes. These methods
prevent water from building higher velocities as it flows downstream within the construction site.
• Control structures designed for permanent detention BMPs are not appropriate for use during
construction without modification. If used during construction, modify the control structure to allow for
long-term storage of runoff and enable sediment to settle. Verify that the BMP is sized appropriately for
this purpose. Restore BMPs to their original design dimensions, remove sediment, and install a final
control structure at completion of the project.
• Erosion has the potential to occur because of increases in the volume, velocity, and peak flow rate of
stormwater runoff from the project site. The local permitting agency may require infiltration or detention
BMP designs that provide additional or different stormwater flow control than the designs detailed in
this manual. These requirements may be necessary to address local conditions or to protect properties
and waterways downstream.
• Velocity of water leaving the site should not exceed 3 feet/second, if the discharge is to a stream or
ditch. Install velocity dissipation, such as BMP C207: Check Dams or BMP C202: Riprap Channel
Lining to ensure reduction of the flow velocity to a non-erosive level.
• If the discharge from a project site is to a municipal storm drainage system, the allowable discharge
rate may be limited by the capacity of the public system. It may be necessary to clean the municipal
storm drainage system prior to the start of the discharge to prevent scouring solids from the drainage
system. Obtain permission from the owner of the collection system before discharging to it. Ensure that
no downstream pipes are surcharged as a result of increased flows from the project site.
• If the discharge from a project site is directly to a flow control exempt receiving water listed in Appendix
I-A: Flow Control Exempt Receiving Waters or to an infiltration system, there is no discharge flow limit.
Suggested BMPs for Element 3
• BMP C203: Water Bars
• BMP C207: Check Dams
• BMP C209: Outlet Protection
• BMP C235: Wattles
• BMP C240: Sediment Trap
• BMP C241: Sediment Pond (Temporary)
• See also V-12 Detention BMPs
How did you comply with this section?
There should be no issues that would require flow control BMP's for this project. The Contractor or CESCL shall
determine if this is required during the course of construction.
Version Date: August 30, 2022
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.
Additional Guidance for Element 4
• Outlet structures that withdraw impounded stormwater from the surface to avoid discharging sediment
that is still suspended lower in the water column are for the construction period only. If installing a
floating pump structure, include a stopper to prevent the pump basket from hitting the bottom of the
pond.
• If a sediment trapping BMP utilizes a control structure that will also be used in a permanent detention
BMP application, the control structure construction must be finalized for the permanent BMP application
upon project completion.
• Install sediment controls in a manner that protects the sensitive areas and their buffers marked in
accordance with Element 1: Preserve Vegetation / Mark Clearing Limits.
• Where feasible, direct stormwater to vegetated areas to increase sediment removal and maximize
stormwater infiltration.
• Seed and mulch earthen structures such as dams, dikes, and diversions according to the timing
indicated in Element 5: Stabilize Soils.
• Full stabilization includes concrete or asphalt paving; quarry spalls used as ditch lining; or the use of
rolled erosion products, a bonded fiber matrix product, or vegetative cover in a manner that will fully
prevent soil erosion.
• The Local Permitting Authority may inspect and approve areas fully stabilized by means other than
pavement or quarry spalls.
Version Date: August 30, 2022
Suggested BMPs for Element 4:
• BMP C231: Brush Barrier
• BMP C232: Gravel Filter Berm
• BMP C233: Silt Fence
• BMP C234: Vegetated Strip
• BMP C235: Wattles
• BMP C240: Sediment Trap
• BMP C241: Sediment Pond (Temporary)
• BMP C250: Construction Stormwater Chemical Treatment
• BMP C251: Construction Stormwater Filtration
How did you comply with this section?
There should be no issues that would require flow control BMP's for this project. The Contractor or CESCL shall
determine if this is required during the course of construction.
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
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.
Version Date: August 30, 2022
Additional Guidance for Element 5
• Soil stabilization BMPs should be appropriate for the time of year, site conditions, estimated duration of
use, and potential water quality impacts that stabilization agents may have on downstream waters or
ground water.
• Ensure that gravel base used for stabilization is clean and does not contain fines or sediment.
Suggested BMPs for Element 5:
• BMP C120: Temporary and Permanent Seeding
• BMP C121: Mulchinq
• BMP C122: Nets and Blankets
• BMP C123: Plastic Covering
• BMP C124: Soddinq
• BMP C125: Topsoiling /Composting
• BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection
• BMP C130: Surface Roughening
• BMP C131: Gradient Terraces
• BMP C140: Dust Control
How did you comply with this section?
BMP C121 Mulching and/or BMP C123 Plastic Covering shall be used to stablize uncovered soils and
onsite stockpiling ('spoils pile' as identified on site plan A0.1)
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 slope drains or protected channels to prevent erosion.
Temporary pipe slope drains must be sized to convey the flow rate calculated by the one fo the
following methods:
• Single Event Hydrograph Method: The peak volumetric flow rate calculated using a 10-minute
time step from a Type 1A, 10-year, 24-hour frequency storm, or;
• Continuous Simulation Method: The 10-year peak flow rate, as determined by an approved
continuous runoff model with a 15-minute time step.
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.
Version Date: August 30, 2022
If using the Western Washington Hydrology Model (WWHM) to predict flows, bare soil areas should be
modeled as "landscaped" area.
❑ 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.
Additional Guidance for Element 6
• Consider soil type and its potential for erosion.
• Stabilize soils on slopes, as specified in Element 5: Stabilize Soils.
• BMP combinations are the most effective method of protecting slopes with disturbed soils. For
example, use both BMP C121: Mulching and BMP C122: Nets and Blankets in combination.
Suggested BMPs for Element 6:
• BMP C120: Temporary and Permanent Seeding
• BMP C121: Mulchinq
• BMP C122: Nets and Blankets
• BMP C123: Plastic Covering
• BMP C124: Sodding
• BMP C130: Surface Roughening
• BMP C131: Gradient Terraces
• BMP C200: Interceptor Dike and Swale
• BMP C201: Grass-Lined Channels
• BMP C203: Water Bars
• BMP C204: Pipe Slope Drains
• BMP C205: Subsurface Drains
• BMP C206: Level Spreader
• BMP C207: Check Dams
• BMP C208: Triangular Silt Dike (TSD)
How did you comply with this section?
The natural topography and developed nature of the project site does not require any BMP's for this element.
The Contractor or the CESCL may employ BMP C121 Mulching and/or BMP C123 Plastic Covering as they deem necessary.
Version Date: August 30, 2022
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).
Additional Guidance for Element 7
• 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
without prior and adequate treatment (as defined above) 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.
Suggested BMPs for Element 7
• BMP C220: Inlet Protection
How did you comply with this section?
There are drainage ditches located within the 23rd & Q Ave right of ways.
The Contractor or CESCL shall inspect and employ BMP C233 Silt Fence&BMP C220 Inlet Protection as deemed necessary.
ELEMENT 8: Stabilize Channels and Outlets
❑ Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the flow rate
calcultated by one the following methods:
o Single Event Hydrograph Method: The peak volumetric flow rate calculated using a 10-minute
time step from a Type 1A, 10-year, 24-hour frequency storm, or;
o Continuous Simulation Method: The 10-year peak flow rate, as determined by an approved
continuous runoff model with a 15-minute time step.
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.
❑ Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent
streambanks, slopes, and downstream reaches at the outlets of all conveyance systems.
Additional Guidance for Element 8
The best method for stabilizing channels is to completely line the channel with BMP C122: Nets and
Blankets first, then add BMP C207: Check Dams as necessary to function as an anchor and to slow the
flow of water.
Version Date: August 30, 2022
Suggested BMPs for Element 8
• BMP C122: Nets and Blankets
• BMP C202: Riprap Channel Lining
• BMP C207: Check Dams
• BMP C209: Outlet Protection
How did you comply with this section?
There are no BMP's required for this project. The Contractor or CESCL shall monitor the City of Anacortes
storm drain ditches/swales located in the public roadway for sediment control.
ELEMENT 9: Control Pollutants
Design, install, implement and maintain effective pollution prevention measures to minimize the discharge of
pollutants. The project proponent must:
❑ 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, or to the sanitary sewer, with local sewer district approval.
❑ 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: recycled concrete stockpiles, 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 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 truck drums or concrete handling equipment onto the ground, or into
storm drains, open ditches, streets, or streams. Washout of small concrete handling equipment may be
Version Date: August 30, 2022
disposed of in a formed area awaiting concrete where it will not contaminate surface or ground water.
Do not dump excess concrete on site, except in designated concrete washout areas. Concrete spillage
or concrete discharge directly to ground water or surface waters of the State is prohibited. Do not wash
out to formed areas awaiting infiltration BMPs.
❑ Obtain written approval from Ecology before using chemical treatment other than CO2, dry ice, or food
grade vinegar to adjust pH.
❑ Uncontaminated water from water-only based shaft drilling for construction of building, road, and bridge
foundations may be infiltrated provided the wastewater is managed in a way that prohibits discharge to
surface waters. Prior to infiltration, water from water-only based shaft drilling that comes into contact
with curing concrete must be neutralized until pH is in the range of 6.5 to 8.5 (su).
Additional Guidance for Element 9
• Wheel wash and/or tire bath wastewater can be combined with wastewater from concrete washout
areas if the wastewaters will be properly disposed of at an offsite location or treatment facility.
• Do not use upland land applications for discharging wastewater from concrete washout areas.
• Woody debris may be chopped and spread on site.
• Conduct oil changes, hydraulic system drain down, solvent and degreasing 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.
Suggested BMPs for Element 9
• BMP C151: Concrete Handling
• BMP C152: Sawcutting and Surfacing Pollution Prevention
• BMP C153: Material Delivery, Storage, and Containment
• BMP C154: Concrete Washout Area
• BMP C250: Construction Stormwater Chemical Treatment
• BMP C251: Construction Stormwater Filtration
• BMP C252: Treating and Disposing of High pH Water
• Also see the Source Control BMPs detailed in Volume IV
How did you comply with this section?
BMP C151 Concrete Handling & BMP C154 Concrete Washout Area have been identified on the
project site plan A0.1. See site plan for additional criteria for this Element.
Version Date: August 30, 2022
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 BMP C240:
Sediment Trap or BMP C241: Sediment Pond (Temporary).
❑ Discharge foundation, vault, and trench dewatering water, which have similar characteristics to
stormwater runoff at the site, into a controlled conveyance system before discharge to Discharge clean,
non-turbid dewatering water, such as well-point ground water, to systems tributary to, or directly into
surface waters of the State, as specified in Element 8: Stabilize Channels and Outlets, provided the
dewatering flow does not cause erosion or flooding of receiving waters. Do not route clean dewatering
water through stormwater sediment BMPs. 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.
❑ Handle highly turbid or otherwise contaminated dewatering separately from stormwater.
❑ Other dewatering 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.
Additional Guidance for Element 10
• Channels must be stabilized, as specified in Element 8: Stabilize Channels and Outlets.
• 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 violation of water
quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration
and preserving vegetation.
• Dewatering water from contaminated sites must be handled separately from stormwater. Direct
contaminated stormwater to a sanitary sewer where allowed by the local sewer authority, or to other
approved treatment.
Suggested BMPs for Element 10
• BMP C203: Water Bars
• BMP C236: Vegetative Filtration
How did you comply with this section?
Not applicable for the scope of work for this project.
Version Date: August 30, 2022
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.
Additional Guidance for Element 11
• Some temporary erosion and sediment control BMPs are biodegradable and designed to remain in
place following construction. BMP C122: Nets and Blankets is an example of a BMP with biodegradable
options.
• 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
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.
Suggested BMPs for Element 11
• BMP C150: Materials on Hand
• BMP C160: Certified Erosion and Sediment Control Lead
How did you comply with this section?
The contractor or the CESCL shall maintain any BMP's that are installed for this protect.
ELEMENT 12: Manage the Project
❑ Phase development projects to the maximum degree practicable and take into account seasonal work
limitations.
❑ Inspect, maintain and repair all BMPs as needed to assure continued performance of their intended
function. Projects regulated under the Construction Stormwater General Permit (CSWGP) must
conduct site inspections and monitoring in accordance with Special Condition S4 of the CSWGP.
❑ Maintain, update, and implement the Construction SWPPP.
❑ Projects that disturb one or more acres must have site inspections conducted by a Certified Erosion
and Sediment Control Lead (CESCL). Project sites disturbing less than one acre may have a CESCL or
a person without CESCL certification conduct inspections. By the initiation of construction, the
Construction SWPPP must identify the CESCL or inspector, who must be present on site or on-call at
all times.
Version Date: August 30, 2022
Additional Guidance for Element 12
The project manager must ensure that the project is built in such a way to comply with all Construction SWPPP
Elements, as detailed in this section. Considerations for the project manager include, but are not limited to:
• construction phasing
• seasonal work limitations
• coordination with utilities and other contractors
• inspection
• monitoring
• maintaining an updated construction SWPPP
Phasing of Construction
Phase development projects where feasible in order to prevent soil erosion and transporting of sediment
from the site during construction. Revegetate exposed areas and maintain that vegetation as an integral part
of the clearing activities for any phase.
Clearing and grading activities for developments shall be permitted only if conducted using an approved site
development plan (e.g., subdivision approval) that establishes permitted areas of clearing, grading, cutting,
and filling. Minimize removing trees and disturbing or compacting native soils when establishing permitted
clearing and grading areas. Show on the site plans and the development site permitted clearing and grading
areas and any other areas required to preserve critical or sensitive areas, buffers, native growth protection
easements, or tree retention areas as may be required by local jurisdictions.
Inspection
All BMPs must be inspected, maintained, and repaired as needed to assure continued performance of their
intended function. Site inspections must be conducted by a person knowledgeable in the principles and
practices of erosion and sediment control. The person must have the skills to 1) assess the site conditions
and construction activities that could impact the quality of stormwater, and 2) assess the effectiveness of
erosion and sediment control measures used to control the quality of stormwater discharges.
For construction sites one acre or larger that discharge stormwater to surface waters of the state, a CESCL
must be identified in the construction SWPPP; this person must be on-site or on-call at all times.
Certification must be obtained through an approved training program that meets the erosion and sediment
control training standards established by Ecology. See BMP C160: Certified Erosion and Sediment Control
Lead.
Appropriate BMPs or design changes shall be implemented as soon as possible whenever inspection and/or
monitoring reveals that the BMPs identified in the Construction SWPPP are inadequate, due to the actual
discharge of/or potential to discharge a significant amount of any pollutant.
The CESCL or inspector must examine stormwater visually for the presence of suspended sediment,
turbidity, discoloration, and oil sheen. They must evaluate the effectiveness of BMPs and determine if it is
necessary to install, maintain, or repair BMPs to improve the quality of stormwater discharges.
Based on the results of the inspection, construction site operators must correct the problems identified by:
• Reviewing the Construction SWPPP for compliance with the 13 elements and making appropriate
revisions within 7 days of the inspection.
• Immediately beginning the process of fully implementing and maintaining appropriate source control
and/or treatment BMPs as soon as possible, addressing the problems no later than within 10 days of
the inspection. If installation of necessary treatment BMPs is not feasible within 10 days, the
construction site operator may request an extension within the initial 10-day response period.
• Documenting BMP implementation and maintenance in the site log book (applies only to sites that have
coverage under the Construction Stormwater General Permit).
Version Date: August 30, 2022
The CESCL or inspector must inspect all areas disturbed by construction activities, all BMPs, and all
stormwater discharge points at least once every calendar week and within 24 hours of any discharge from
the site. (For purposes of this condition, individual discharge events that last more than one day do not
require daily inspections. For example, if a stormwater pond discharges continuously over the course of a
week, only one inspection is required that week.) The CESCL or inspector may reduce the inspection
frequency for temporary stabilized, inactive sites to once every calendar month
Maintaining pdated Construction SWPPP
Retain the Construction SWPPP on-site or within reasonable access to the site.
Modify the Construction SWPPP whenever there is a change in the design, construction, operation, or
maintenance at the construction site that has, or could have, a significant effect on the discharge of
pollutants to waters of the state.
The Construction SWPPP must be modified if, during inspections or investigations conducted by the
owner/operator, or the applicable local or state regulatory authority, it is determined that the Construction
SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the
site. Modify the Construction SWPPP as necessary to include additional or modified BMPs designed to
correct problems identified. Complete revisions to the Construction SWPPP within seven (7) days following
the inspection.
Suggested BMPs for Element 12
• BMP C150: Materials on Hand
• BMP C160: Certified Erosion and Sediment Control Lead
• BMP C162: Scheduling
How did you comply with this section?
BMP C160 Certified Erosion and Sediment Control Lead, shall be established for this project and shall
perform all the responsibilities outlined in the Element 12 above and in the 2019 DOE Stormwater Manual.
ELEMENT 13: Protect Low Impact Development BMPS
The primary purpose of On-Site Stormwater Management is to reduce the disruption of the natural site
hydrology through infiltration. BMPs used to meet 1-3.4.5 MR5: On-Site Stormwater Management (often called
LID BMPs) are permanent facilities.
❑ Protect all LID BMPs (including, but not limited to BMP T7.30: Bioretention, BMP T5.14: Rain Gardens,
and BMP T5.15: Permeable Pavements) from sedimentation through installation and maintenance of
erosion and sediment control BMPs on portions of the site that drain into the LID BMPs. Restore the
BMPs to their fully functioning condition if they accumulate sediment during construction. Restoring the
BMP must include removal of sediment and any sediment-laden Bioretention/Rain Garden soils, and
replacing the removed soils with soils meeting the design specification.
❑ Maintain the infiltration capabilities of LID BMPs by protecting against compaction by construction
equipment and foot traffic. Protect completed lawn and landscaped areas from compaction due to
construction equipment.
❑ Control erosion and avoid introducing sediment from surrounding land uses onto BMP T5.15:
Permeable Pavements. Do not allow muddy construction equipment on the base material or pavement.
Do not allow sediment-laden runoff onto permeable pavements or base materials.
Version Date: August 30, 2022
❑ Permeable pavement fouled with sediments or no longer passing an initial infiltration test must be
cleaned using procedures in accordance with this manual or the manufacturer's procedures.
❑ Keep all heavy equipment off existing soils under LID BMPs that have been excavated to final grade to
retain the infiltration rate of the soils.
Additional Guidance for Element 13
See Chapter 5: Precision Site Preparation, Construction & Inspection of LID Facilities in the LID Technical
Guidance Manual for Puget Sound (Hinman and Wulkan, 2012) for more detail on protecting LID integrated
management practices.
Note that the LID Technical Guidance Manual for Puget Sound (Hinman and Wulkan, 2012) is for additional
informational purposes only. You must follow the guidance within this manual if there are any discrepancies
between this manual and the LID Technical Guidance Manual for Puget Sound (Hinman and Wulkan, 2012).
Suggested BMPs for Element 13
• BMP C102: Buffer Zones
• BMP C103: High-Visibility Fence
• BMP C200: Interceptor Dike and Swale
• BMP C201: Grass-Lined Channels
• BMP C207: Check Dams
• BMP C208: Triangular Silt Dike (TSD)
• BMP C231: Brush Barrier
• BMP C233: Silt Fence
• BMP C234: Vegetated Strip
How did you comply with this section?
Not applicable for the scope of work for this project.
Applicant Signature Date
Version Date: August 30, 2022