HomeMy WebLinkAboutGVR-2024-010 - GRADINGFor inspections, please call (360) 293-1901
PARCEL: P77999
LEGAL DESCRIPTION:
APPLICANT: Construction, Strider
4721 Northwest Drive
Bellingham, WA 98226
3603801234
OWNER: MJB PROPERTIES LLC
UNKNOWN
SEATTLE, WA 98108
FEES:Paid Due
Grading Plan Review Fee $50.00 $0.00
Grading Permit Fee $23.50 $0.00
$0.00Totals :
REQUIRED INSPECTIONS
Initial BMP's Stormwater Final
$73.50
GVR-2024-010 CLEAR AND GRADE
ISSUED:
EXPIRES:
04/23/2025
04/23/2026
PROJECT NAME: STRIDER LAY DOWN YARD
SITE ADDRESS: 2403 R AV ANACORTES
Page 1 of 1Printed by : Cheri Gleichmann on: 04/23/2025 04:35 PM
City of Anacortes, WA
904 6th Street
Anacortes, WA 98221
(360) 293-1901
http://cityofanacortes.org/
Storm Water Drainage Report
Minimum Requirements 1 through 5
Minimum Requirement 1 through 9
ENGINEERING DEPARTMENT
904 6th Street Anacortes, WA 98221
www.anacorteswa.gov
Official Use Only: (Information to Inspectors)
Required Storm Water Facility and other related requirements:
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Project Address: ________________ Submittal Date: __________________
Parcel Number: ________________ Revision Number: ________________
Permit Number: ________________ Reviewer: _______________________
Acceptance Date (COA):____________
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 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 - 2024 manual will be adopted soon
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: 07/26/24 Page 1
R Ave. & 24th St.
P77999 & P131152
9/30/24
Stormwater Review
Aaron Esterholt
Project Description and Summary:
Summary Table
Existing Proposed
Development Type
Number of Lots
Lot Acreage in SF
Soil Type(s)
Site Sediment Transport Score (High\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)
Impervious Surface (on-site)
Impervious Surface (off-site)
New and Replaced Hard Surface Total (SF)
Lot Coverage (Percentage)
BMP (Required Minimum Requirement 5) BMP T5.13 Post Construction Soils
Water Quality Method (Minimum Requirement 6)
Water Quantity Method (Minimum Requirement 7)
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 Phasing\Sequence )
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Developed Conditions Summary:
(Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard
surfaces , proposed contours)
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Drainage Basin (2007 Storm Comp Plan – City website\publicworks\engineering\comprehensive plans):
What Drainage Basin are you in? _________ Identify any downstream drainage issues (Storm Comp Plan:
_________ If so, describe:
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Complete the Applicability Requirements – Flow Chart (See next page(s)
-Highlight the path and attach
-Add a map of where your stormwater goes from your project to the discharge site
Version date: 07/26/24 Page 2
Gravel lot to be used as a temporary lay down area for construction projects.
City of Anacortes EngineeringPO Box 547, Anacortes, WA 98221 Telephone:360.293.1920
Construction Completion Report
In accordance with City of Anacortes (COA) procedures, a Construction Completion Report is required for all approved construction projects. Engineers of Record must submit a Construction Completion Report to the City of Anacortes within twenty (20) days of completion and before use of any third party constructed facilities including; but not limited to grading, streets, sidewalks, water lines, sanitary and storm sewers and related items. Please type or print legibly in ink:
____________________________________________________________________________________ Name of Project or Development
____________________________________ _______________________________________ Owner or Project Contact Name COA Project No.
____________________________________ _______________________________________ Mailing Address Date Construction Documents Approved by COA
____________________________________ City State Zip
____________________________________ _________________________________________ Phone Number E-Mail Address
PROJECT NAME AND DESCRIPTIVE TITLE Check one: Entire Project Completed. Description of Portions Completed Complete (Attach additional sheets as needed)
PROFESSIONAL ENGINEER’S ACKNOWLEDGEMENT The undersigned professional engineer (PE), or their authorized agent has inspected the above-described project in its entirety and the project has been constructed and is substantially completed in accordance with the construction plans and specifications approved by the COA. In the opinion of the undersigned engineer, the installation, and physical testing procedures were carried out in accordance with COA construction standards and principles of standard engineering practice. I have reviewed the following:
disinfection procedures sewer air pressure test pressure test results
alignment videos sewer/storm paving/asphalt structures sewer/storm
results of the bacteriological test(s) permanent stormwater facilities
for this project and certify that they comply with the requirements of the construction standards/specifications approved by the COA. (Check all boxes that apply that are consistent with the nature of this project.) ___________________________________________Date Signed _______________________________________Engineer’s Signature
_______________________________________ State/Federal Funding Type (if any)
P.E. SEAL
Version date: 07/26/24 Page 3
Figure I-3.1: Flow Chart for Determining Requirements for New
Development
2024 Stormwater Management Manual for Western Washington
Volume I -Chapter 3 -Page 109Version date: 07/26/24 Page 4
Figure I-3.2: Flow Chart for Determining Requirements for
Redevelopment
2024 Stormwater Management Manual for Western Washington
Volume I -Chapter 3 -Page 110Version date: 07/26/24 Page 5
TAB 1 (MINIMUM REQUIREMENT #1)
1-3.4.1 Minimum Requirement #1 – Prepare a Stormwater Site Plan
Note: The level of detail needed for each step depends upon the project size. Provide a narrative
description of each step.
Step 1 – Analyze Existing Stie Conditions to Determine LID Feasibility
The existing site analysis is intended to determine the pre-development conditions on the site in
addition to determining the appropriateness for use of Low Impact Development (LID) techniques.
Site conditions as identified in this step will determine the feasibility of the overall stormwater
design including use of LID techniques. The development context shall be established by an
existing site analysis consistent with the requirements detailed in this Step.
The initial inventory and analysis process will provide baseline information necessary to design
strategies that utilize areas most appropriate to evaporate, transpire, and infiltrate stormwater,
and achieve the goal of mimicking the pre-development natural hydrologic conditions on the site.
The existing site analysis shall include, at a minimum, the following information:
1. A survey prepared by a registered land surveyor, civil engineer, or other qualified
professional showing: (See this section for additional items to include)
2.A soils report prepared by a professional soil scientist certified by the Soil Science Society of
America (or an equivalent national program), or by other suitably trained persons working
under the supervision of a professional engineer, geologist, hydrogeologist, or engineering
geologist registered in the State of Washington.
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Step 2 - Prepare Preliminary Development Layout
Based upon the existing site analysis results, locate the buildings, roads, parking lots, landscaping
features, LID BMPs, and preliminary location of Runoff Treatment and Flow Control BMPs for the
proposed development. Consider the following points when laying out the site:
Fit development to the terrain to minimize land disturbance; confine construction activities to
the least area necessary, and away from critical areas.
Preserve areas with natural vegetation (especially forested areas) as much as possible.
On sites with a mix of soil types, locate impervious areas over less permeable soil (e.g., till),
try to restrict development over more porous soils or take advantage of them by locating
bioretention, rain gardens and/or permeable pavement over them.
Cluster buildings together.
Minimize impervious areas.
Maintain and utilize the natural drainage patterns.
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Version date: 07/26/24 Page 6
N/A - No development taking place
N/A - No development taking place
_____________________________________________________________________________
_____________________________________________________________________________
Step 3 - Perform Off-site Analysis
City of Anacortes requires an off-site analysis for projects that add 5,000 SF or more of new
hard surfaces, or convert ¾ acres of vegetation to lawn or landscape areas, or convert 2.5
acres of forested area to pasture.
Off-site analysis extends to ¼ mile downstream of the project site.
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Step 4 – Determine and Read the Applicable Minimum Requirements (Place at the front end of
the document before MR#1)
I-3.3 Applicability of the Minimum Requirements establishes project thresholds for the
application of Minimum Requirements to new development and redevelopment projects. Figure
I-3.1: Flow Chart for Determining Requirements for New Development (Included in the report)
and Figure I-3.2: Flow Chart for Determining Requirements for Redevelopment (Included in
the report) provide the same thresholds in a flow chart format. Based on the preliminary
layout, determine whether Minimum Requirements #1 and #2 only apply to the project, or #1
through #5 only apply to the project, or #1 through #9 apply.
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Step 5 - Prepare a Permanent Stormwater Control Plan (Place in Appendix 5 of this report)
(Due to the extent of required information for this section, refer to this section of the Ecology
Manual for requirements.)
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Version date: 07/26/24 Page 7
N/A - No new hard surfaces or vegetation
changes
N/A - No new devolpment
N/A - No permanent devolopment
Step 6 - Prepare a Construction Stormwater Pollution Prevention Plan (Place in MR#2 – 13
Elements)
The Construction SWPPP for projects adding or replacing 2,000 square feet of hard surface or
more, or clearing 7,000 square feet or more, must contain sufficient information to satisfy the
local government Plan Approval Authority that the potential pollution problems have been
adequately addressed for the proposed project. Local governments may adopt a standard
SWPPP format for use by projects less than 1 acre. An adequate Construction SWPPP
includes a narrative and drawings. The narrative is a written statement to explain and justify the
pollution prevention decisions made for a particular project. The narrative contains concise
information concerning existing site conditions, construction schedules, and other pertinent
items that are not contained on the drawings. The drawings and notes describe where and
when the various BMPs should be installed, the performance the BMPs are expected to
achieve, and actions to be taken if the performance goals are not achieved.
See II-2.4 Preparing Construction SWPPPs for details about what to include in the project's
Construction SWPPP.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
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:
A. Project Overview (Front End)
B. Existing Conditions Summary (Front End)
C. Off-site Analysis Report (Minimum Requirement 1, Step 3)
D. Permanent Stormwater Control Plan (Appendix 5)
E. Construction Stormwater Pollution Prevention Plan (Minimum Requirement 2)
F. Special Reports and Studies (Survey – Appendix 1, Geotechnical – Appendix 2, all
others placed after Appendix 8)
G. Other Permits, if applicable
H. Operation and Maintenance Manual (Appendix 8)
I.Declaration of Covenant for Privately Maintained Flow Control and Treatment Facilities.
(See attached Drainage BMP Maintenance Covenant BMP Agreement) (Appendix 7)
J. Declaration of Covenant for Privately Maintained On-site Stormwater BMP’s (See
attached Drainage BMP Maintenance Covenant BMP Agreement) (Appendix 7)
K. Bond Quantities Worksheet, if applicable
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Version date: 07/26/24 Page 8
See attached.
See attached
Step 8 - Check Compliance with all Applicable Minimum Requirements
Before Submitting this report, 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.
Note: The report will be returned if determined incomplete.
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
_____________________________________________________________________________
Version date: 07/26/24 Page 9
PLANNING, COMMUNITY, & ECONOMIC DEVELOPMENT DEPARTMENT
Mailing Address: P.O. Box 547, Anacortes, WA 98221
Office Location: 904 6th Street, Anacortes WA 98821
Phone: (360) 293-1901
Weekly Erosion Control Self-Inspection Reports
All sites that have a Stormwater Pollution
Prevention Plan #2, 1-5 or 1-9 are required to
submit a weekly erosion control/BMP monitoring
inspection report through the citizen portal.
These reports can be found on the city website
and through the link on the submittals tab in the
permitting customer portal.
Turning in the
weekly report
consistently will
help keep your
project on
schedule and
avoid unnecessary
delays due to
cancelled
inspections.
Erosion-Control-Inspection-Form--Sites-Less-Than-One-Acre-fillable-PDF (anacorteswa.gov)
Stormwater Site Inspection Form (anacorteswa.gov) (For larger sites)
We appreciate your assistance in keeping our documentation up to date.
Just complete the fillable PDF, save it, and
then upload it with the blue upload tab.
Version date: 07/26/24 Page 10
TAB 2 (MINIMUM REQUIREMENT #2)
1-3.4.2 Minimum Requirement #2 – Construction Stormwater Pollution Prevention Plan (SWPP)
All new development and redevelopment projects are responsible for preventing erosion and
discharge of sediment and other pollutants into receiving waters.
Projects which result in 2,000 square feet or more of new plus replaced hard surface area, or which
disturb 7,000 square feet or more of land must prepare a Construction Stormwater Pollution
Prevention Plan (SWPPP) as part of the Stormwater Site Plan (see MR1: Preparation of Stormwater
Site Plans).
Projects below those thresholds (listed above) are not required to prepare a Construction SWPPP,
but must consider all of the Construction SWPPP Elements (listed below) and develop controls for all
Construction SWPPP Elements that pertain to the project site.
General Requirements:
The Construction SWPPP shall include a narrative and drawings. All BMPs shall be clearly
referenced in the narrative and marked on the drawings. The Construction SWPPP narrative shall
include documentation to explain and justify the pollution prevention decisions made for the project.
Each of the 13 Construction SWPPP Elements (listed below) must be considered and included in the
Construction SWPPP unless site conditions render the Element unnecessary and the exemption from
that Element is clearly justified in the narrative of the SWPPP.
Clearing and grading activities for developments shall be permitted only if conducted pursuant to an
approved site development plan (e.g., subdivision approval) that establishes permitted areas of
clearing, grading, cutting, and filling. These 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, shall be delineated on the site plans and the development site.
The Construction SWPPP shall be implemented beginning with initial land disturbance and until final
stabilization. Sediment and Erosion control BMPs shall be consistent with the BMPs contained in II-3
Construction Stormwater BMPs.
Seasonal Work Limitations: From October 1 through April 30, clearing, grading, and other soil
disturbing activities shall only be permitted if shown to the satisfaction of the local permitting authority
that silt-laden runoff will be prevented 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; and
2. Limitations on activities and the extent of disturbed areas; and
3. Proposed erosion and sediment control measures.
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, and
3. Activities where there is one hundred percent infiltration of surface water runoff within the site
in approved and installed erosion and sediment control facilities.
Version date: 07/26/24 Page 11
Version date: 07/26/24 Page 12
Strider Lay Down Area
N/A
N/A
N/A
N/A
X
N/A
X
X
N/A
N/A
N/A
N/A
N/A
X
X
N/A
20 cy
15,000 SF
N/A
15,000 SF
Version date: 07/26/24 Page 13
N/A
N/A
Gravel with weeds
X Guemes Channel
Guemes Channel at east end of site
N/A
N/A
N/A
Version date: 07/26/24 Page 14
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Version date: 07/26/24 Page 15
Version date: 07/26/24 Page 16
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:____________________________________________
Site Address:_____________________________________________
Prepared By:_____________________________________________
The Stormwater checklist or building permit determined that:
The 13 elements must be addressed
for construction activity adding under
2,000 sq. ft. of hard surface area.
These elements must be addressed
for construction activity adding 2,000
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.
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Version date: 07/26/24 Page 17
MJB Properties
24th St & R Ave Anacortes, WA
Strider Construction Co., Inc.
Silt Fence installed
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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: 07/26/24 Page 18
Construction Entrance Installed
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Version date: 07/26/24 Page 19
N/A
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: 07/26/24 Page 20
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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: 07/26/24 Page 21
Silt Fence Installed
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: Mulching
BMP C122: Nets and Blankets
BMP C123: Plastic Covering
BMP C124: Sodding
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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: 07/26/24 Page 22
N/A
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: Mulching
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Version date: 07/26/24 Page 23
N/A
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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: 07/26/24 Page 24
N/A
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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: 07/26/24 Page 25
N/A
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Version date: 07/26/24 Page 26
N/A
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Version date: 07/26/24 Page 27
N/A
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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: 07/26/24 Page 28
CESCL Inspections
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: 07/26/24 Page 29
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 an Updated 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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
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 I-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: 07/26/24 Page 30
CESCL Inspections
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?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
___________________________________________ _____________________
Applicant Signature Date
Version date: 07/26/24 Page 31
Silt Fence Installed
TAB 3 (MINIMUM REQUIREMENT #3)
1-3.4.3 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 should be considered in all
projects.
Supplemental Guidelines
Source Control BMPs include Operational BMPs and Structural Source Control BMPs. See Volume IV
for design details of these BMPs. For construction sites, see II-3.2 Construction Source Control BMPs.
Structural Source Control BMPs should be identified in the stormwater site plan and should be shown
on all applicable plans submitted for local government review and approval.
An adopted and implemented Basin Plan (see Appendix I-B: Basin Plans) or Total Maximum Daily Load
(see I-2.13 Total Maximum Daily Loads (TMDLs)) may be used to develop more stringent source
control requirements that are tailored to a specific basin.
Identifying Source Control Strategies in a Basin Plan
Basin Plans can identify potential sources of pollution within the basin and develop strategies to
eliminate or control these sources to protect beneficial uses.
A Basin Plan can include the following Source Control strategies:
1. Detection and correction of illicit discharges to storm sewer systems, including the use of dry
weather sampling and dye-tracing techniques;
2. Identification of existing businesses, industries, utilities, and other activities that may store
materials susceptible to spillage or leakage of pollutants into the storm sewer system or to the
ground via wells, drains, or sumps;
3. Elimination or control of pollutant sources identified in (2);
4. Identification and control of future businesses, industries, utilities, and other activities which may
store materials susceptible to spillage or leakage of pollutants into the storm sewer system; and
5. Training and public education
A Basin Plan that incorporates the standard requirements from this section as well as more stringent
requirements does not require Ecology approval.
What Source Control BMP’s are applicable to your project?
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
Version date: 07/26/24 Page 32
N/A
TAB 4 (MINIMUM REQUIREMENT #4)
1-3.4.4 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 referenced section of the manual for supplemental guidelines and additional information
under this section.
Will this project disturb the Natural Drainage System or Outfall of the project Site? Yes\No. If
yes, refer to section I-3.4.4 for Supplemental Guidelines for additional information.
Version date: 07/26/24 Page 33
N/A
Version date: 07/26/24 Page 34
TAB 5 (MINIMUM REQUIREMENT #5)
1-3.4.5 Minimum Requirement #5 – On-site Stormwater Management
Projects shall employ Stormwater Management BMPs in accordance with the following thresholds,
standards, and lists to infiltrate, disperse, and retain stormwater runoff on site to the extent feasible
without causing flooding or erosion impacts.
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? ______ (Yes\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).
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
If the project is Flow Control Exempt, select from the List 3 below: (Skip List 1 and List 2)
o BMP T5.13 Post Construction Soils Quality and Depth
Roofs:
o BMP T5.10A: Downspout Full Infiltration, or;
o BMP T5.10B Downspout Dispersion Systems, or;
o BMP T5.10C: Performated Stub-out Connections, or;
Other Hard Surfaces:
o BMP T5.12: Sheet Flow Dispersion, or;
o BMB T5.11: Concentrated Flow Dispersion
LID Performance Standard
The LID Performance Standard compliance method for Minimum Requirement #5 requires modeling the
proposed Flow Control BMPs to demonstrate the flow reduction as described below. Note that in order
to meet the LID Performance Standard, the chosen Flow Control BMPs will most likely need to include
infiltration.
Stormwater discharges shall match developed discharge durations to pre-developed durations for the
range of pre-developed discharge rates from 8% of the 2-year peak flow to 50% of the 2-year peak flow.
Refer to the Flow Control Performance Standard section in I-3.4.7 MR7: Flow Control for information
about the assignment of the pre-developed condition. Project sites that must also meet I-3.4.7 MR7:
Flow Control must match flow durations between 8% of the 2-year flow through the full 50-year flow.
Designers selecting this option cannot use BMP T5.14: Rain Gardens to achieve the LID Performance
Standard. They may choose to use BMP T7.30: Bioretention to achieve the LID Performance Standard.
Version date: 07/26/24 Page 35
N/A
The List Approach
The List Approach compliance method for Minimum Requirement #5 requires evaluating the BMPs in
Table I-3.2: The List Approach for MR5 Compliance.
For each surface, evaluate the feasibility of the BMPs in the order listed, and use the first BMP that is
considered feasible. The designer must document the site conditions and infeasibility criteria used to
deem BMPs infeasible. Once a BMP is deemed feasible and used for a surface, no other BMP from the
list is necessary for that surface.
If all BMPs in the list are infeasible, then the designer must document the site conditions and infeasibility
criteria used to deem each BMP infeasible. This documentation will demonstrate compliance with
Minimum Requirement #5.
Feasibility shall be determined by evaluation against:
Design criteria, limitations, and infeasibility criteria identified for each BMP in this manual; and
Competing Needs Criteria as listed below.
______________________________________________________________________________________
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.
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: 07/26/24 Page 36
List #1 – Project Triggering Minimum Requirement 1 through 5
For each surface, consider the BMPs in the order listed for that type of surface. Use the first BMP that
is considered feasible. No ther On-site Stormwater Management BMP is necessary for that surface.
Provide feasible detail under each BMP with maintenance and operations specifications in Minimum
Requirement 5.
Roofs: List #1
1.BMP T5.30: Full Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, T5.10A: Downspout Full Infiltration (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
2.BMP T5.14: Rain Gardens (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, BMP T7.30: Bioretention Cells, Swales, and Planter Boxes (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
3. BMP T5.10B: Downspout Dispersion Systems (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
4. BMP T5.10C: Perforated Stub-out Connections (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Version date: 07/26/24 Page 37
Other Hard Surfaces: List #1
1. BMP T.5.30 Full Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
2.BMP T5.15: Permeable Pavements (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, BMP T.14: Rain Gardens (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, BMP T7.30: Biorention Cells, Swales and Planter Boxes (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
3.BMP T5.12: Sheet Flow Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, BMP T5.11: Concentrated Flow Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
___________________________________________ _____________________
Applicant Signature Date
Version date: 07/26/24 Page 38
List #2 – Project Triggering Minimum Requirement 1 through 9
For each surface, consider the BMPs in the order listed for that type of surface. Use the first BMP that
is considered feasible. No ther On-site Stormwater Management BMP is necessary for that surface.
Provide feasible detail under each BMP with maintenance and operations specifications in Minimum
Requirement 5.
Roofs: List #2
1.BMP T5.30: Full Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, T5.10A: Downspout Full Infiltration (Feasible\Infeasible)
If infeasible, provide the criteria:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
2.BMP T7.30: Biorention (Feasible\Infeasible)
If infeasible, provide the criteria:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
3.BMP T5.10B: Downspout Dispersion Systems (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
2.BMP T5.10C: Perforated Stub-out Connections (Feasible\Infeasible)
If infeasible, provide the criteria:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
Version date: 07/26/24 Page 39
Other Hard Surfaces: List #2
1.BMP T.5.30 Full Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
2.BMP T5.15: Permeable Pavements (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
3.BMP T7.30: Biorention (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
4.BMP T5.12: Sheet Flow Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Or, BMP T5.11: Concentrated Flow Dispersion (Feasible\Infeasible)
If infeasible, provide the criteria:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
___________________________________________ _____________________
Applicant Signature Date
Version date: 07/26/24 Page 40
Figure III-1.1: Runoff Treatment BMP Selection Flow Chart
2024 Stormwater Management Manual for Western Washington
Volume III -Chapter 1 -Page 463Version date: 07/26/24 Page 41
TAB 6 – (MINUMUM REQUIREMENT 6 - RUNOFF TREATMENT)
Refer to 1.2.5.6 and provide the required information for this Minimum Requirement.
Version date: 07/26/24 Page 42
Figure I-3.5: Flow Chart for Determining Wetland Protection Level
Requirements
2024 Stormwater Management Manual for Western Washington
Volume I -Chapter 3 -Page 145Version date: 07/26/24 Page 43
TAB 7 – (MINUMUM REQUIREMENT 7 – FLOW CONTROL)
Refer to 1.2.5.7 and provide the required information for this Minimum Requirement.
Version date: 07/26/24 Page 44
TAB 8 – (MINUMUM REQUIREMENT 8 – WETLAND PROTECTION)
Refer to 1.2.5.8 and provide the required information for this Minimum Requirement.
Version date: 07/26/24 Page 45
TAB 9 – (MINUMUM REQUIREMENT 9 – OPERATION AND MAINTENANCE)
Refer to 1.2.5.9 and provide the required information for this Minimum Requirement.
Version date: 07/26/24 Page 46
APPENDIX 1 – Survey performed by a Professional Land Surveyor
The object of this appendix is to ensure that the property has a minimum of 3 out of 5 property corners
visible to ensure that the structures are placed within the required setbacks.
Version date: 07/26/24 Page 47
APPENDIX 2 – Soils Anaylsis (Volume 3, Chapter 3.3.2)
Provide the soils report in this appendix
Version date: 07/26/24 Page 48
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. The form needs to be uploaded to your SmartGov account.
Version date: 07/26/24 Page 49
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 on page 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
___ Subsoil will be scarified
___ inches (depth) of scarification needed to achieve finished total 12” loosened depth.
PRE-APPROVED
AMENDMENT METHOD:
___ Topsoil import
___ Amend with compost
___ Stockpile and amend
( ____ cu. yds. stockpiled)
____inches of compost or imported topsoil applied
X 3.1 (conversion factor, inches to cubic yards)
_____= cu. yards per 1,000 sq. ft.
X ___ ,000s sq.ft. in this area
____ = cubic yards of amendment → → → → →
(needed to cover this area to designated depth)
PRODUCT:_________________________
__________________________________
QUANTITY:________CU. YDS.
CUSTOM AMENDMENT
___ Topsoil import
___ Topsoil & compost lift
___ Amend
___ Stockpile and amend
(____ cu. yds. stockpiled)
Attach test results and calculations.
____ inches organic matter or topsoil import
X 3.1
_____= cu. yards / 1,000 sq. ft.
X ___ ,000s sq.ft. in this area
____ = cubic yards of amendment → → → → →
PRODUCT:_________________________
__________________________________
QUANTITY:________CU. YDS.
MULCH ___ ,000 sq.ft.
X 6.2 (conversion, to give 2 inch mulch depth)
____ = cubic yards of mulch → → → → → →
PRODUCT:_________________________
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: 07/26/24 Page 50
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.
Version date: 07/26/24 Page 51
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: 07/26/24 Page 52
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
100 High
A high transport rating indicates a higher risk that the site will generate sediment contaminated
runoff.
Version date: 07/26/24 Page 53
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.............................................................................................
1 If no surface or groundwater enters site, give 0 points.
Version date: 07/26/24 Page 54
APPENDIX 5 – Site Plan with all applicable information (Minimum Size 11x17 at a legible scale)
Version date: 07/26/24 Page 55
APPENDIX 6 – Documented Site Photos (Show all directions of the site, including frontage)
(Insert Photo Here)
Location:
Description of the photo:
Photo taken by:
Version date: 07/26/24 Page 56
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.
Version date: 07/26/24 Page 57
APPENDIX 8 – Maintenance and Operations Manual
Maintenance and Operations Manual is required by DOE: www.anacorteswa.gov/DocumentCenter/View/26423/Stormwater-BMP-Maintenance-Standards?bidld=
Version date: 07/26/24 Page 58
Return Address:
City of Anacortes
Planning and Community Development 904 6th Street
Post Office Box 547
Anacortes, WA 98221
Drainage BMP Facility Maintenance Covenant
Grantor(s) hereinafter referred to as Grantor:
1. ________________________________
Grantee: City of Anacortes, hereinafter referred to as the City, a Political Subdivision under the Laws of the State of Washington.
Legal Description of property encumbered by covenant:
Abbreviated:
Survey recorded under ____________________. See attached Exhibit A for abbreviated Legal Description.
Common Name of the Development of the property encumbered by covenant:
___________________________________________
Located in ___ qtr. Sec. ___ Twp. ___., Rge. ______.
Reference Number(s) of documents assigned, released, or modified: N/A
Assessor's Property Tax Parcel/Account Number(s) of property(s)
encumbered by the drainage covenant: _______________________
Page 1 Grantor's Initials ___
Version date: 07/26/24 Page 59
Grantor has a record interest in the property encumbered by the covenant and agrees that the obligations of Grantor shall inure to the benefit of and be binding upon the
heirs, successors, and assigns. Grantor agrees that this covenant touches and
concerns the land described in Page 1 of this agreement and shall run with the land.
Grantor by execution of this covenant acknowledges that the benefits of this covenant inure to Grantor, downstream property owners , and the general public, and that the City
as third-party beneficiary of this covenant has the right, but not the obligation, to enforce
this covenant on behalf of downstream property owners and the general public. The City requires this covenant to protect private and public property, private and public
drainage infrastructure, and natural resources of downstream property owners and the
general public.
Grantor in consideration of the approval of the City development permit No. ____________________, relating to the real property described on Page 1 and in
consideration of other valuable consideration, receipt and sufficiency of which is hereby
acknowledged, hereby covenants to perform regular inspections upon the drainage
facilities installed, or to be installed, upon Grantor's property. These inspections shall
compare the facility/BMP device to the standards described in the current Stormwater
Management Manual for Western Washington in use by the City of Anacortes (herein
referred to as “the Manual”) for all elements of the stormwater drainage system. For any BMP facility approved by the City but not included in the Manual;
maintenance standards shall be as described in the manufacturer’s
operation and maintenance manual; which shall also be referred to as the Manual. As applicable, the system shall include the stormwater conveyance pipes,
ditches , swales, and catch basins; stormwater flow regulation system detention ponds,
vaults, pipes, retention ponds, flow regulation and control structures; infiltration systems
and all other stormwater quality or flow control system.
The inspections conducted on all facility/BMPs shall be performed by qualified
personnel who have received professional training in the aspects of stormwater
management for which they are responsible to inspect. For example a person qualified
to perform an inspection on a detention pond must demonstrate that they have received professional training specifically on detention pond maintenance and compliance with
standards.
The City shall request a record of the inspection annually. The Grantor shall provide to
the City a written record of the inspection performed and the condition of the facility/BMP upon request. The record shall provide an explanation of each
maintenance component and potential defect identified in the maintenance standards in
the Manual for each specific BMP/facility. Where measurements must be taken to (trash
or debris exceeds 60% of the sump…) the actual field measurements must be included
on the report. Pictures of each BMP facility shall be included, and the date(s) of the
inspections must be clearly identified.
Version date: 07/26/24 Page 60
The scope of this covenant and right of entry shall be adequate to provide for the access,
inspection, and maintenance of the stormwater drainage system, and shall be subject to
the following terms and conditions:
1.The City shall have the perpetual right of entry across adjacent lands of the
Grantor for purposes of inspecting, auditing, or conducting required
maintenance of the drainage BMP facility.
2.The facility specific maintenance standards contained in the Manual are
intended to be conditions for determining if maintenance actions are
required. The standards are not intended to be a measure of the facility’srequired condition at all times. Discovery through inspection that a facility’scondition is in exceedance of a standard does not constitute a violation of
this agreement.
3.Should a facility be discovered in a condition that constitutes an exceedance ofany described standard, maintenance shall be performed on the following
schedule:
a.Within nine months for typical maintenance of facilities, except catch
basins.b.Within three months for catch basins.c.Within eighteen months for any maintenance that requires capital
construction or expenditure over $25,000
4.In the event that Grantor fails to complete the required maintenance within theidentified time period, the City shall have the right to immediately and withoutfurther notice perform or contract with others to perform all maintenancenecessary to return the facility/BMP to compliance with the standard. This workshall be performed at the sole expense of the Grantor.
5.If the City in its sole discretion determines that an imminent or present dangerexists, that any condition exists that could constitute a threat to human health,welfare or the environment, or any condition exists that could cause the City to
be found in violation of the Western Washington Phase II Municipal StormwaterNPDES permit issued to the City of Anacortes, or any other environmentalpermit, the City may take any action required including beginning maintenance
or repairs immediately at Grantor's expense without prior notice to Grantor. Insuch event, the City shall provide Grantor with a written statement andaccounting of all work -performed and the fees, charges, and expenses
incurred in making such repairs. Grantor shall agree to reimburse the City orpay the City's vendors directly for all reasonable fees, charges, and expensesidentified in the City's statement.
6.If the City is required to act as a result of Grantor's failure to comply with this
covenant, the City may remove any obstructions and/or interferences that in
the sole opinion of the City impair the operation of the drainage BMP facility orthe maintenance thereof. Grantor agrees to hold the City, its officers,
Version date: 07/26/24 Page 61
employees, and agents harmless from any and all claims, actions, suits,
liability, loss, expenses, damages and judgments of any nature whatsoever,
including costs and attorney's fees, incurred by the removal of vegetation or
physical interference from the drainage BMP facility.
7.When exercising the maintenance provisions of the covenant, in the event of
nonpayment, the City may bring suit to recover such costs, including
attorney's fees, and upon obtaining a judgment, such amount shall becomea lien against the property of Granter as provided in RCW 4.56.190.
8.Grantor covenants that the owners of the property described herein are the
person or persons identified on page 1 of this covenant as Grantors, that
they have the right to grant this covenant on the property, and that the title
to the property is free and clear of any encumbrances which would interferewith the ability to grant this covenant.
Executed this day of _
Grantors:
Signature(s): _
Printed
Name(s):
Title of Authorized Representative(s):
(if signing on behalf of a corporation)
Version date: 07/26/24 Page 62
Accepted and approved for the City of
Anacortes:
Date: Director City of Anacortes Department of Planning and
Community Development Services
Version date: 07/26/24 Page 63
Construction
Entrance Silt Fence
Stockpile/Staging
Area
- Drainage
Construction
Entrance Silt Fence
Stockpile/Staging
Area
24th Street
25th Street
26th Street