HomeMy WebLinkAboutPermit File BLD-2020-0591 2805 Grady Lane (2) G1T Y o Storm Water Drainage
Minimum Requirements 1 through 5
k,� Minimum Requirement 1 through 9
ENGINEERING DEPARTMENT
CO�� 904 6th Street Anacortes, WA 98221
www.anacorteswa.gov
Official Use Only: (Information to Inspectors)
Required Storm Water Facility and other related requirements:
Sediment discharge potential of 90, Low.
reviewed as #2 only. part of a larger development. 1-9 done under plat.
Project Address: 2805 Grady Lane Submittal Date: 29 September 2020
Parcel Number: P126317 Revision Number: 1
Permit Number: Reviewer: Rob F.
Acceptance Date (COA): 10/28/20
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.
Stormwater Management Requirements:
o Refer to the 2012\14 Department of Ecology Manual, as amended in 2014 for further required
information.
o See also, City of Anacortes Municipal Code 19.76 for additional information
o See also, current Engineering Development Standards, Chapter 2- Storm Drainage for additional
information.
Project Description and Summary:
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Summary Table
Existing Proposed
Development Type None SFR
Number of Lots 1 1
Lot Acreage in SF 7,853 7,853
Soil Type(s) LaConner Very Gravelly Loamy Sand
(also, possible fill material)
Site Sediment Transport Score (High\Low) 90
Depth to Ground Water Table (Feet and Inches) N/A
(See completed Soils Analysis (Volume 1, Chapter 3.1.1)
Infiltration Rate during Rainy Season (Inch\Per Hour) N/A
Impervious Surface (on-site) 0 3,870 +/-
Impervious Surface (off-site) 0 0
New and Replaced Hard Surface Total (SF) 3,870 +/-
Lot Coverage (Percentage) 38.5% (residence) /49.3% (all imp.)
BMP (Required Minimum Requirement 5) BMP T5.13 Post Construction Soils
Water Quality Method (Minimum Requirement 6) N/A
Water Quantity Method (Minimum Requirement 7) N/A
Existing Site Conditions Summary:
(Additionally, provide information on previous permits, if any, like Grade and Fill, Clear and Grade, topography,
vegetation, drainage, Critical Areas adjacent to the site and how it may affect this project if soils are disturbed,
Soils Type (Included in Soils Analysis Report), Erosion Problem Areas, Construction PhasinglSequence)
There are no known previous permits for this site. The topography slopes to the north. The site is relatively flat
(5-7%) on the majority of the site where the home will be built. Some short steep slopes exist along the
northern (backyard) portion of the site. The vegetation is mowed pasture grass. There are no drainage facilities
on the site but a stub-out is provided in the unopened Park Avenue ROW. There are no critical areas in the
vicinity. The low point of the site is in the northeast corner. There are no plans to phase the construction.
Developed Conditions Summary:
(Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard
surfaces , proposed contours)
The completed project will be a house with a driveway and patios.
Drainage Basin (2007 Storm Comp Plan — City website\publicworks\engineering\comprehensive plans):
What Drainage Basin are you in? G3 Identify any downstream drainage issues (Storm Comp Plan:
If so, describe:
None identified in the Comp Plan.
Stormwater is carried in man-made pipes and ditches to the saltwater outfall of Guemes Channel
Complete the Applicability Requirements — Flow Chart (Figure 1-2.4.1 Attached, Figure 1-2.4.2 Attached
and Figure 1-2.5.1 Attached)
- Highlight the path and attach
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Start Here
Does the site have See Redevelopment
35%or more of Yes Minimum
existing inapen ioi s
Requirements and
coverage?
Flow Chart
No Dots the project convert (Figure _4_2)
34 acres or more of
Does the project vegetation to laws_or
result in 5,000 landscaped areas,or
square feet, or No convert 2._5 acres or more
greater, of new plus p of native vege#ation to
replaced hard pasture?
surface area?
Does the project
Yes Yes No result in 2.,000 square
x feet, or greater, of
All 1+ 1131YCYum new plus replaced
hard surface area?
Requirements apply
to the new and
replaced hard surfaces
and con-;erted I Yes No
vegetation areas.
Minimum RequirementsDoes the project have
#1 through 45 apply to land disturbing
the new and replaced activities of 7,000
hard surfaces and the
7Ces square feet or greater?
land disturbed.
No
if
Minimum
Requirement 42
applies_
Figure 2.4.1 —Flow Chart for Determining Requirements for New Development
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Does the project result in 2.000 square feet, or more, of new plus replaced hard surface area?
OR
Does the land disturbing activity total 7,000 square feet or greater?
Yes No
Minimum Requirements#1 through #5
apply to the new and replaced hard Minimum Requirement 2 applies.
surfaces and the land disturber
Next Question
Does the project add 5.000 square feet or more of new hard surfaces?
OR
Convert 3a acres or more of vegetation to lawn or landscaped areas?
OR
Convert 2.5 acres or more of native vegetation to pasture?
Yes No
• T
All Minimum Requirements apply Next Question Is this a road
to the new hard surfaces and the 110related project? NO
converted vegetation areas.
} Ves
Dces the project add E.000 square feet or more of new hard surfaces?
* Yes No +
Is the total of new plus replaced hard surfaces
Do the new hard 5.000 square feet or more.
surfaces add 50% or No No additional No AND
more to the existing Jc,es the value of the proposed improvements
requirements.
hard surfaces within - including interior improvements -exceed
the project limits? 50% a'the assessed value (or replacemen:
value) of the existing site improvements?
Yes All Minimum Requirements apply to the new and replaced ,
hard surfaces and converted vegetation areas. Yes
imaMMI Figure 1-2.4.2
Flow Chart for Determining Requirements for
Redevelopment
DEPARTMENT OF Revised,.Une2O1E
ECOLOGY DMe3se see htV:2:Arvw.ecy.wagovecopyrk;irrnirrne for copyrgnt notice Inclu dIng perm lions.
State of Washington nitabon of lianlllty,and di&clarrrer.
V CI bIUI I Ucl1C. VIaUUCI /, GU 13 rl CVIUUS V CI,IUI I uenu. ruul uc11 y GU, LU I
Flow Chart for Determining LID MR #5 Requirements
Does the project discharge to Flow Control Exempt Waters 1
(per Minimum Requirement(MR)#7)?
Yes
REQUIRE D:Implement the owing BMPs No
where feasible: No, the project
Does the project trigger only MRs
BMP T5.13: Post-Construction Soil #1 -#5?(Per Figure 3.2 or Figure triggered only
Quality and Depth 3.3 in Appendix 1 of the 2013-2018 MR#2 i No additional
.-. BMP T5.10A, B,or C: Downspout Full WWA Phase II Permit&Phase I requirements
Infiltration,Downspout Dispersion Permit.)
Systems,or Perforated Stub-out
Connections / No, the project
a 8MP T5.11 or T5.12:Concentrated Flow triggered MRs#1- #9.
Dispersion or Sheet Flow Dispersion Yes
Is the project inside the U'GA?
NOT REQUIRED:Achievement of the LID
Performance Standard. Applying the other I No,the project is
BMPs in list in or List N2. outside the UGA.
4111111M. / Yes
Did the project developer choose to meet the
LID Performance Standard? Is the project on a parcel of
5 acres or larger?
No, project developer I No �_ 1
chose List#1..• Yes -dr• Yes
Did the project developer
REQUIRED; For each surface,
choose to meet the LID RFQt1IRFD: Meet the LID
consider the BM Ps in the order
Performance Standard? Performance Standard through the
listed in ListIlfor that type of /
surface. Use the first BMP that is use aF BMP(s]in the 2014
considered feasible. Yes SWMMWW except for Rain Gardens
No,project (the use of Btioretention is
NOT REQUIRED:Achievement of developer acceptable).
the LID Performance Standard. chose list It2.
1 / 1r If the project can't meet the LID
0 Performance Standard, it must seek
REQUIRED: Meet the LID Performance REQUIRED:For each surface, and be granted an exception/
Standard through the use of any BMP(s)in consider the BMPs in the variance.
the 2014 SW MMWW except for Rain Gardens order listed in list#2 for
(the use of Bioretention is acceptable). that type of surface. Use the REQUIRED:Apply BMP T5.13 Post-
first BMP that is considered Construction Soil Quality and Depth.
REQUIRED for Projects Triggering MR 111-94:
feasible.
Apply BMP T5.13 Post Construction Soil NOT REQUIRED:Applying the BMPs
Quality and Depth, NOT REQUIRED: in List#1 or List#2.
Achievement of the LID
NOT REQUIRED,,Applying the BMPs in List#1
Performance Standard.
or List#2.
`Recommended by Ecology for projects triggering MR 111-5.
Figure 2.5.1 — Flow Chart for Determining LID MR #5 Requirements
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 1 (MINIMUM REQUIREMENT #1)
• 1-2.5.1 Minimum Requirement#1 — Prepare a Stormwater Site Plan
- 1.3 — Preparation of a Stormwater Site Plan
- 1.3.1 — Stormwater Site Plans: Step-by-Step
Note: The level of detail needed for each step depends upon the project size. Provide a narrative
description of each step.
1-3.1.1 Step 1 - Site Analysis: Collect and Analyze Information on Existing Conditions
Site analysis shall be submitted as part of the Existing Conditions Summary above. Part of the
information in this step should be used to help prepare the Construction Stormwater Pollution
Prevention Plan. Purpose of the Site Analysis is to provide for a Low Impact Development site
design that is intended to compliment the predeveloped conditions of the site.
The on-site soils are generally sandy gravelly loam. The site appears to have received fill
material, possibly during plat construction.
Because the site is already served by storm drainage constructed with the plat, no stormwater LID
BMPs are proposed (except for"Post Construction Soil Quality and Depth — BMP T5.13")
1-3.1.2 Step 2 - Prepare Preliminary Development Layout
Based upon the analysis of existing site conditions, locate the buildings, roads, parking lots,
landscaping features, on-site stormwater management BMP's, and preliminary location of
stormwater treatment and retention/detention facilities for the proposed development.
Preliminary Development Layout prepared.
1-3.1.3 Step 3 - Perform Off-site Analysis (at Local Agency's Option): Use additional Sheets, if
necessary,
Ecology recommends that local governments require an off-site analysis for projects that add
5,000 SF or more of new hard surfaces, or convert 3/4 acres of vegetation to lawn or landscape
areas, or convert 2.5 acres of forested area to pasture.
Off-site analysis extends to mile downstream of the project site.
The downstream conveyance from the site is a 100% man-made conveyance that includes pipes
and roadside ditches that convey the runoff to the salt-water outfall.
The Plat was designed to accommodate development on this parcel.
1-3.1.4 - Determine Applicable Minimum Requirements
Establish project size thresholds for the application of Minimum Requirements to new
development and redevelopment projects. Figures 2.4.1 (Attached) and 2.4.2 (Attached)
provide the same thresholds in a flow chart format. Based on the preliminary layout, determine
whether Minimum Requirements #1 through #5 apply to the project; or, whether Minimum
Requirements #1 through #9 apply.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Please note, that Minimum Requirement#1 through #5 may trigger additional Minimum
Requirements, such as Flow Control.
Minimum Requirements 1-5 apply.
1-3.1.5 Step 5 - Prepare a Permanent Stormwater Control Plan
(Refer to this section of the Ecology Manual for requirements.)
Aside from connecting the roof/footing drains and possibly a yard drain near the driveway to the
existing plat's stormdrainage system, no on-site stormwater systems are proposed.
1-3.1.6 Step 6 - Prepare a Construction Stormwater Pollution Prevention Plan (MR#2 — 13
Elements)
Refer to Chapter 11-3— Planning for a detailed description of each element. See also attached
Tables 4.1.1 (Source Control BMP's by SWPPP Element) and Table 4.2.1 (Runoff Conveyance
and Treatment BMP's by SWPPP Element).
See attached 13 Elements of a SWPPP, please complete and attached
A Construction Stormwater Pollution Prevention Plan (MR#2 — 13 Elements) was prepared.
1-3.1.7 Step 7 - Complete the stormwater site plan
The Stormwater Site Plan encompasses the entire submittal to the Local Agency with drainage
review authority. Refer to this section of the Manual for further clarification of each item and
what is required. See below:
• Project Overview
• Existing Conditions Summary
• Off-site Analysis Report
• Permanent Stormwater Control Plan
• Construction Stormwater Pollution Prevention Plan
• Special Reports and Studies
• Other Permits
• Operation and Maintenance Manual
• Declaration of Covenant for Privately Maintained Flow Control and Treatment Facilities.
(See attached Drainage BMP Maintenance Covenant BMP Agreement)
• Declaration of Covenant for Privately Maintained On-site Stormwater BMP's (See
attached Drainage BMP Maintenance Covenant BMP Agreement)
• Bond Quantities Worksheet, if applicable
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
1-3.1.8 Step 8 - Check Compliance with all Applicable Minimum Requirements
A Stormwater Site Plan as designed and implemented should specifically fulfill all Minimum
Requirements applicable to the project. The Stormwater Site Plan should be reviewed to check
that these requirements are satisfied.
Implementation of this Stormwater Site Plan will fulfill all Minimum Requirements applicable to this
protect.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 2 (MINIMUM REQUIREMENT #2)
• 1-2.5.2 Minimum Requirement#2 — Construction Stormwater Pollution Prevention Plan (SWPP)
- All projects are required to complete Minimum Requirement 2.
- Refer to the 13 Elements of the SWPP (See document below, complete and attach)
- See attached Table 4.1.1, Table 4.2.1 and Table
- Provide Engineering Calculations as an attachment for Sediment Ponds\Traps, Diversions,
Waterways and Runoff/Stormwater Detention Calculations.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Table 4.1.1 Source Control BMP's by SWPPP Element
Element#1 Element#2 Element#13
Element#5 Element#6 Element#9 Element#11 Element#12
Preserve Establish Protect Low
BMP or Element Name Stablize Protect Control Maintain Manage the
Vegetation/Mark Construction Soils Slopes Pollutants BMPs Project Impact
C learina Limits Access Development
BMP C101: Preserving Natural Vegetation ✓
BMP C102:Buffer Zones ✓ ✓
BMP C103:High Visibility Plastic or Metal ✓ ✓
Fence
BMP C105: Stabilized Construction ✓
Entrance l Exit
BMP C106: Wheel Wash ✓
BMPC107: Construction Road/Parking ✓
Area Stabilization
BMP C120:Temporary and Permanent V ✓
Seeding
BMP C121: Mulching ✓ ✓
BMP C122: Nets and Blankets ✓ ✓
BMPC123: Plastic Covering ✓
BMPC124: Sodding ✓
BMP C125: Topsoiling l Composting ✓
BMP C126: Polyacrylamide for Soil Erosion ✓
Protection
BMP C130: Surface Roughening ✓ ✓
BMP C131: Gradient Terraces ✓ ✓
BMPC140: Dust Control ✓
BMP C150: Materials On Hand ✓ ✓
BMPC151: Concrete Handling ✓
BMP C152: Sawcutting and Surfacing ✓
Pollution Prevention
BMP C153: Material Delivery,Storage and ✓
Containment
BMP C154: Concrete Washout Area ✓
BMP C160: Certified Erosion and
Sedroent Control Lead ✓
BMPC162:Scheduling ✓
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Table 4.2.1 Runoff Conveyance and Treatment BMP's by SWPPP Element
Bement#4 Seemed MI Elmira#I3
Elernani 03 lttsttdl Element AG Element N7 s Bement HS Element 010
Stabilize Protect Low
®MP or Element Hanle Control Sedirrwrrt Protect Pbtect Che mz s Pollutants
Cankal Ds- Impact
Flow Rates Campois Slopes Maim Inlets and Outlets WeLe fnp 3trokrpmcnt
OW'e200: kmtsrceptor Dike and Swale ✓
BMP C201: Graes-Lmed C harm els ✓
MAP C202:Channel Lining
BAAP C203: Water Bars ✓ ✓
SOAP C204: Pk*Slope Drams ✓
!AAP C20& 8uberadeos Drains I
BMP C206: Level Spreader ✓
MAP C207: Check Dams ✓ ✓
BMP C206: Triangular Sill pike is3aeto lao ✓ _ ✓
Encased Chock Den)
BMP C209: Outlet Protection ✓
BMP Cam: Storm Drain Inlet Protection ✓
BMP C23l: drtrdt Bawler ✓ ✓
BMP C232 °ravel Filler Berm
BMP cm Eat Fence +f f
BMPC234: PhgeaslsdAitlp .f ✓
BMP C235: Prattles J
BMP C23G Vegitetive Filtration
BMPC3l0: Sediment Trap J ✓
BMP C241: Temporary Sediment Pond ✓ ✓
BMP C250: Construction S$omsaumY( I,
Cherdial Infirm at
BMP C251:Construction Stemmata - ✓
FlNnmtlott •
BMP C2S2 Matt pii Neutraltretlan Using
Cal •
BPAP C253:pH Control for High pH Water t/
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
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 2014 Stormwater Management Manual for Western Washington
(SWMMWW). A link is provided on the City of Anacortes website, under Planning, Community, & Economic
Development Department, as well as under Stormwater on the Engineering Division of Public Work's page.
Owner Name: John & Sarah Loudermilk
Site Address:2805 Grady Lane
Prepared By: David Lervik, PE
The Stormwater checklist or building permit determined that:
❑ The 13 elements must be addressed ❑ These elements must be addressed
for construction activity adding under for construction activity adding 2,000
2,000 sq. ft. of hard surface area. sq. ft. or more of hard surface area.
This means that an attached narrative
and site plan are required with this
document.
Under each element, provide the BMP's that will be applicable to your project. Use the attached Tables
provided.
ELEMENT 1: Preserve Vegetation/Mark Clearing Limits
Before beginning land disturbing activities, including clearing and grading, clearly mark all clearing
limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area.
❑ Retain the duff layer, native top soil, and natural vegetation in an undisturbed state to the maximum
degree practical.
BMP C101: Preserve Natural Vegetation
BMP C103: High Visibility Plastic or Metal Fence
BMP C233: Silt Fence
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.
H 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.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
BMP C105: Stabilized Construction Entrance
BMP C107: Construction Road/Parking Area Stabilization
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.
None proposed.
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.
BMP C101: Preserving Natural Vegetation
BMP C233: Silt Fence
BMP C240: Sediment Trap (if practical on site—field design and locate if needed)
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.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
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.
BMP C120: Temporary and Permanent Seeding
BMP C121: Mulching
BMP C123: Plastic Covering
BMP C124: Sodding
BMP C125: Topsoiling
ELEMENT 6: Protect Slopes
❑ Design and construct cut-and-fill slopes in a manner to minimize erosion. Applicable practices include,
but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope
steepness, and roughening slope surfaces (Ex: track walking).
❑ Divert off-site stormwater (run-on) or ground water away from slopes and disturbed areas with
interceptor dikes, pipes, and/or swales. Off-site stormwater should be managed separately from
stormwater generated on the site.
At the top of slopes, collect drainage in pipe slop drains or protected channels to prevent erosion.
o *Temporary pipe slope drains must handle the peak volumetric flow rate calculated using a 10-
minute time step from a Type 1A, 10-year, 24-hour frequency storm for the developed condition.
Alternatively, the 10-year, 1-hour flow rate predicted/indicated by an approved continuous runoff
model, increased by a factor of 1.6, may be used. The hydrologic analysis must use the existing
land cover condition for predicting flow rates from tributary areas outside the project limits. For
tributary areas on the project site, the analysis must use the temporary or permanent project
land cover condition, whichever will produce the highest flow rates. If using the Western
Washington Hydrology Model (WWHM) to predict flows, bare soil areas should be modeled as
"landscaped" area.
o Where 15-minute time steps are available in an approved continuous runoff model, they may be
used directly without a correction factor.
❑ Place excavated material on the uphill side of trenches, consistent with safety and space
considerations.
❑ Place check dams at regular intervals within constructed channels that are cut down a slope.
❑ Consider soil types and its potential for erosion.
❑ Stabilize soils on slopes, as specified in Element 5.
BMP combinations are the most effective method of protecting slopes with disturbed soils. Ex: Use both
mulching and straw erosion control blankets.
BMP C120: Temporary and Permanent Seeding
BMP C130: Surface Roughening
NOTE: Site grading and development may eliminate slopes with grading, walls, etc.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
ELEMENT 7: Protect Drain Inlets
❑ Protect all storm drain inlets made operable during construction so that stormwater runoff does not
enter the conveyance system without first being filtered or treated to remove sediment.
❑ Clean or remove and replace inlet protection devices when sediment has filled one-third of the available
storage (unless a different standard is specified by the product manufacturer).
❑ Where possible, protect all existing storm drain inlets so that stormwater runoff does not enter the
conveyance system without first being filtered or treated to remove sediment.
❑ Keep all approach roads clean. Do not allow sediment and street wash water to enter storm drains
without prior and adequate treatment unless treatment is provided before the storm drain discharges to
waters of the State.
Inlets should be inspected weekly at a minimum and daily during storm events.
The drain inlet in the cul-de-sac of Grady Lane will be protected. Likewise, any on-site yard drains made
operational prior to site stabilization will be protected.
ELEMENT 8: Stabilize Channels and Outlets
n Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the following
expected peak flows:
o *Channels must handle same peak volumetric flow rate as temporary pipe slope drains listed in
Element 6, above.
Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent
streambanks, slopes, and downstream reaches at the outlets of all conveyance systems.
❑ The best method for stabilizing channels is to completely line the channel with a blanket product first,
then add check dams as necessary to function as an anchor and to slow the flow of water.
No channels are proposed for this project.
ELEMENT 9: Control Pollutants
❑ Design, install, implement, and maintain effective pollution prevention measures to minimize the
discharge of pollutants.
❑ Handle and dispose of all pollutants, including waste materials and demolition debris that occur on-site
in a manner that does not cause contamination of stormwater.
❑ Provide cover, containment, and protection from vandalism for all chemicals, liquid products, petroleum
products, and other materials that have the potential to pose a threat to human health or the
environment. On-site fueling tanks must include secondary containment. Secondary containment
means placing tanks or containers within an impervious structure capable of containing 110% of the
volume contained in the largest tank within the containment structure. Double-walled tanks do not
require additional secondary containment.
❑ Conduct maintenance, fueling, and repair of heavy equipment and vehicles using spill prevention and
control measures. Clean contaminated surfaces immediately following any spill incident.
❑ Discharge wheel wash or tire bath wastewater to a separate on-site treatment system that prevents
discharge to surface water, such as closed-loop recirculation or upland land application, or to the
sanitary sewer, with local sewer district approval. Wheel wash or tire bath wastewater should not
include wastewater from concrete washout areas.
❑ Apply fertilizers and pesticides in a manner and at application rates that will not result in loss of
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
chemical to stormwater runoff. Follow manufacturers' label requirements for application rates and
procedures.
❑ Use BMPs to prevent contamination of stormwater runoff by pH-modifying sources. The sources for this
contamination include, but are not limited to: bulk cement, cement kiln dust, fly ash, new concrete
washing and curing waters, waste streams generated from concrete grinding and sawing, exposed
aggregate processes, dewatering concrete vaults, concrete pumping, and mixer washout waters. Adjust
the pH of stormwater if necessary to prevent violations of the water quality standards.
❑ Assure that washout of concrete trucks is performed off-site or in designated concrete washout areas
only. Do not wash out concrete trucks onto the ground, or into storm drains, open ditches, streets, or
streams. Do not dump excess concrete on site, except in designated concrete washout areas. Concrete
spillage or concrete discharge to surface waters of the State is prohibited. Do not use upland land
applications for discharging wastewater from concrete washout areas.
❑ Obtain written approval from Ecology and provide to the City before using chemical treatment other
than CO2 or dry ice to adjust pH.
Woody debris may be chopped and spread on site.
Conduct oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel
tank drain down and removal, and other activities which may result in discharge or spillage of pollutants
to the ground or into stormwater runoff using spill prevention measures, such as drip pans.
Clean contaminated surfaces immediately following any discharge or spill incident. Emergency repairs
may be performed on-site using temporary plastic placed beneath and, if raining, over the vehicle.
BMP C151: Concrete Handling
BMP C152: Sawcutting and Surfacing Pollution Prevention
ELEMENT 10: Control De-Watering
❑ Discharge foundation, vault, and trench dewatering water, which have characteristics similar to
stormwater runoff at the site, into a controlled conveyance system before discharge to a sediment trap
or sediment pond.
❑ Discharge clean, non-turbid de-watering water, such as well-point ground water, to systems tributary to,
or directly into surface waters of the State, as specified in Element 8, provided the de-watering flow
does not cause erosion or flooding of receiving waters or interfere with the operation of the system. Do
not route clean dewatering water through stormwater sediment ponds. Note that "surface waters of the
State" may exist on a construction site as well as off site; for example, a creek running through a site.
Handle highly turbid or contaminated dewatering water separately from stormwater.
Other treatment or disposal options may include:
1. Infiltration
2. Transport off-site in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that
does not pollute state waters.
3. Ecology-approved on-site chemical treatment or other suitable treatment technologies.
4. Sanitary or combined sewer discharge with local sewer district approval, if there is no other
option.
5. Use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized
dewatering.
❑ Construction equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam
can create highly turbid or contaminated dewatering water.
Discharging sediment-laden (muddy)water into waters of the State likely constitutes a violation of water
quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration
and preserving vegetation.
No de-watering is anticipated for this project.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
ELEMENT 11: Maintain BMPs
Maintain and repair all temporary and permanent erosion and sediment control BMPs as needed to
assure continued performance of their intended function in accordance with BMP specifications.
❑ Remove all temporary erosion and sediment control BMPs within 30 days after achieving final site
stabilization or after the temporary BMPs are no longer needed. Some temporary erosion and sediment
control BMPs are bio-degradable and designed to remain in place following construction such as
compost socks.
❑ Provide protection to all BMPs installed for the permanent control of stormwater from sediment and
compaction. All BMPs that are to remain in place following completion of construction shall be
examined and placed in full operating conditions. If sediment enters the BMPs during construction, it
shall be removed and the facility shall be returned to the conditions specified in the construction
documents.
n Remove or stabilize trapped sediment on site. Permanently stabilize disturbed soil resulting from
removal of BMPs or vegetation.
ELEMENT 12: Manage the Project— Projects subject to Minimum Requirements 1-9 must have a Certified
Erosion and Sediment Control Lead (CESCL) for site inspections. Projects subject to Minimum Requirements
1-5 do not require the inspector to be certified. By the initiation of construction, the SWPPP must identify the
CESCL or inspector, who shall be present on-site or on-call at all times.
n Phase development projects to the maximum degree practicable and take into account seasonal work
limits to prevent soil erosion and prevent transporting sediment from the site during construction.
❑ Inspection and monitoring — Inspect, maintain, and repair all BMPs as needed to assure continued
performance of their intended function.
❑ Maintain, update, and implement the SWPPP.
❑ Clearing and grading activities for developments shall be permitted only if conducted using an approved
site development plan (e.g., subdivision approval).
From Oct 1 through Apr 30, clearing, grading, and other soil disturbing activities is permitted only if
shown that the site operator will prevent silt-laden runoff from leaving the site through a combination of
the following:
1. Site conditions including existing vegetative coverage, slope, soil type, and proximity to
receiving waters.
2. Limit activities and the extent of disturbed areas.
3. Proposed erosion and sediment control measures.
Weather conditions can influence the seasonal limitation on site disturbance. The City of Anacortes has
the authority to take enforcement action per AMC 19.76 Stormwater.
❑ The following activities are exempt from the seasonal clearing and grading limitations:
1. Routine maintenance and necessary repair of erosion and sediment control BMPs;
2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or
result in the removal of the vegetative cover to soil
3. Activities where there is 100% infiltration of surface water runoff within the site in approved and
installed erosion and sediment control facilities.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
ELEMENT 13: Protect Low Impact Development BMPS
n If implementing any bioretention facilities or rain gardens, refer to the applicable BMP sections of the
Manual for requirements.
No LID BMPs are proposed for this project.
29 September 2020
Applicant gnature Date
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 3 (MINIMUM REQUIREMENT #3)
• 1-2.5.3 Minimum Requirement#3 —Source Control of Pollution
All known, available and reasonable source control BMP's must be applied to all projects. Source
control BMP's must be selected, designed, maintained according to the reference Ecology Manual.
The intent of source control BMP's is to prevent stormwater from coming in contact with pollutants.
They are a cost-effective means of reducing pollutants in stormwater, and, therefore, should be
considered in all projects.
Single Family Residential Construction Projects and Residential Subdivisions are Exempt from
this Minimum Requirement
All Commercial Properties, Industrial Properties, and Multi-Family Properties, Boatyards, Sand and
Gravel Mining Opertations are required to comply with this Minimum Requirement.
Refer to Chapter IV-2.1 Applicable (Mandatory) Operationsal Source Control BMP's
Exempt because the project is a single-family residence.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 4 (MINIMUM REQUIREMENT #4)
• Minimum Requirement#4— Preservation of Natural Drainage Systems and Outfalls
Natural drainage patterns shall be maintained and discharges from the project shall occur at the natural
location, to maximum extent practicable. The manner by which runoff is discharged from the project site
must not cause a significant adverse impact to downstream receiving waters and down gradient
properties. All outfalls require energy dissipation.
The objective is to preserve and utilize drainage systems to the fullest extent because of the multiple
stormwater benefits these systems provide; and to prevent erosion at the downstream of the discharge
location.
Refer to the reference manual for supplemental guidelines and additional information under this
section.
Will this project disturb the Natural Drainage System or Outfall of the project Site? Yes\No. If
yes, refer to section 1.2.5.4 for Supplemental Guidelines for additional information.
No diversion of runoff from the basin will occur.
Stormwater runoff from the lawn area of the property will continue to flow north toward the unopened
Park Street right-of-way,
Downspout, footing draings and retaining wall drains (if any) will be routed to the existing storm drain
stub provided for the lot during plat construction
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 5 (MINIMUM REQUIREMENT #5)
• Minimum Requirement#5— On-site Stormwater Management
Project thresholds that trigger Minimum Requirements #1 through #5, shall utilize the On-site
Stormwater Management BMP's from List#1 for all surfaces within each type of surface in List#1; or,
Demonstrate compliance with the LID Performance Standard. Projects selecting this option cannot use
Rain Gardens. They may choose to use Bioretention BMP's as described in Chapter V-7 — Infiltration
and Bioretention Treatment Facilities to achieve the LID Performance Standard.
Refer to this section of the reference Manual for all Feasibility or Infeasibility Criteria for List#1
and List#2.
Is this project Flow Control Exempt? YES (Yes\No) (See Appendix l-E: Flow Control-Exempt
Surface Water). If yes, provide reasoning from the applicability section of 1-2.5.7 Minimum
Requirement#7: Flow Control). If No, then the project triggers Minimum Requirement#7 (1-2.5.7) and
possibly Minimum Requirement#8 (1-2.5.8).
The project connects directly to a salt water outfall via a conveyance that is fully man-made.
If the project is Flow Control Exempt, select from the list below (Skip List 1 and List 2).
o BMP T5.13 Post Construction Soils Quality and Depth
o BMP T5.10A: Downspout Full Infiltration, or;
o BMP T5.10B Downspout Dispersion Systems, or; See modified"List#1"
o BMP T5.10C: Performated Stub-out Connections, or; below for feasibility
o BMP T5.11 Concentrated Flow Dispersion, or; rationale.
o BMP T5.12 Sheet Flow Dispersion
Projects triggering only Minimum Requirements 1 through 5, shall either:
A. Use On-site Stormwater Management BMP's from List#1 for all surfaces within each type of
surface in List#1, or;
B. 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 Treatments Facilities to achieve the LID Performance Standard.
If a project will utilize the LID Performance Standard, then provide and attach reports and
calculations.
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 Standard Flow Control Requirement section in Minimum Requirement 7 for
information abou the assignment of the pre-developed conditions. Project sites that mus also meet
Minimum Requirement 7— Flow Control, must match flow durations between 8% of the 2-year flow
through the full 50 year flow.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Projects triggering Minimum Requirements 1 through 9, must meet the requirements in 1-2.5.5
Minimum Requirement 5— On-site Stormwater Management.
o Refer to Table 1-2.5.1 On-site Stormwater Management Requirements for Projects Triggering
Minimum Requirements 1 through 9 in the Department of Ecology Manual.
All sites are required to utilize BMP T5.13 — Post Construction Soil Quality and Depth.
For each surface, consider the BMP's in the order listed for that type of surface. Use the first BMP that
is considered feasible. No other on-site Stormwater Management BMP is necessary for that surface.
Feasiblity shall be determined by evaluation against:
1. Design criteria, limitations and infeasiblity criteria identified for each BMP in this manual, and;
2. Competing needs criteria listed in Chapter V-5 — On-site Stormwater Management.
Lawn and Landscaped Area:
• BMP T5.13: Post-Construction Soil Quality and Depth. (Attach Detail in Report)
Refer to this site for requirements and specifications. All projects are required to utilize this BMP.
http://www.soilsforsalmon.org/pdf/Soil BMP Manual.pdf
See Appendix 3 for the "Model Soil Management Plan for BMP T5.13" to be submitted with
Drainage Report and Application Material.
An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils
Supplier that identifies the soils to be used meet the specifications outlined under Minimum
Requirement 5. The specifications are in both WSDOT and CSI Formats. For specifications, refer to
the above referenced PDF.
This submittal can be a deferred submittal since most projects are not sure who the supplier will be
at the time of building permit application. For projects that trigger Minimum Requirements 1 through
5, the Test Report will be provided to the Building Department. Projects triggering Minimum
Requirements 1 through 9, the Test Report will be provided to the Engineering Department.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
List #1 — Project Triggering Minimum Requirement 1 through 5
(Note: This is modified to respond to the Flow-Control Exempt conditions listed above)
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
T5.10A: Downspout Full Infiltration Feasi e\Infeasible�
If infeasible, explain the criteria:
Site lacks adequate space for separation from building, as well as downgradient steep slopes.
Note, the original plat provided a storm drainage stub for the footings and downspout drains
BMP T5.10B: Downspout Dispersion Systems Feasi \Infeasible)
If infeasible, explain the criteria:
Splashblocks are infeasible due to the lack of a 50-foot vegetated flow path.
A Dispersion Trench is infeasible due to the lack of a 50-foot vegetated flow path.
BMP T5.10C: Perforated Stub-out Connections Feasi e\Infeasible)
If infeasible, explain the criteria:
The site lacks adequate setbacks from property lines and/or steep slopes.
Other Hard Surfaces: List#1
BMP T5.12: Sheet Flow Dispersion Feas' Ie\InfeasiblF)
If infeasible, explain the criteria:
The site lacks adequate runoff space before reaching the property line.
Or, BMP T5.11: Concentrated Flow Dispersion Feasi a\Infeasible)
If infeasible, explain the criteria:
The site lacks adequate runoff space before reaching the property line.
29 September 2020
Applicant ignature Date
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
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, explain the criteria:
Or, T5.10A: Downspout Full Infiltration Feasible\Infeasible
If infeasible, explain the criteria:
2. BMP T7.30: Biorention Cells, Swales and Planter Boxes Feasible\Infeasible
If infeasible, explain the criteria:
3. BMP T5.10B: Downspout Dispersion Systems Feasible\Infeasible
If infeasible, explain the criteria:
4. BMP T5.10C: Perforated Stub-out Connections Feasible\Infeasible
If infeasible, explain the criteria:
Other Hard Surfaces: List#2
1. BMP T.5.30 Full Dispersion Feasible\Infeasible
If infeasible, explain the criteria:
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
2. BMP T5.15: Permeable Pavements Feasible\Infeasible
If infeasible, explain the criteria:
3. BMP T7.30: Biorention Cells, Swales and Planter Boxes Feasible\Infeasible
If infeasible, explain the criteria:
4. BMP T5.12: Sheet Flow Dispersion Feasible\Infeasible
If infeasible, explain the criteria:
Or, BMP T5.11: Concentrated Flow Dispersion Feasible\Infeasible
If infeasible, explain the criteria:
Applicant Signature Date
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 6 — (MINUMUM REQUIREMENT 6 - RUNOFF TREATMENT)
Refer to 1.2.5.6 and provide the required information for this Minimum Requirement.
* * * * * NOT APPLICABLE * * * * *
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 7 — (MINUMUM REQUIREMENT 7 — FLOW CONTROL)
Refer to 1.2.5.7 and provide the required information for this Minimum Requirement.
* * * * * NOT APPLICABLE * * * * *
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 8 — (MINUMUM REQUIREMENT 8 —WETLAND PROTECTION)
Refer to 1.2.5.8 and provide the required information for this Minimum Requirement.
* * * * * NOT APPLICABLE * * * * *
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 9 — (MINUMUM REQUIREMENT 9 — OPERATION AND MAINTENANCE
Refer to 1.2.5.9 and provide the required information for this Minimum Requirement.
* * * * * NOT APPLICABLE * * * * *
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
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APPENDIX 2 — Soils Anaylsis (Volume 1, Chapter 3.1.1)
Soil logs not performed because other conditions (setbacks, slopes, etc.) rendered the various BMPs infeasible.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
APPENDIX 3 — Model Soil Management Plan for BMP T5.13
Page of
Complete all information on page 1;only site address and permit number on additional pages.
Site Address:2805 Grady Lane Parcel No: P126317
Permit Type: Building Permit Permit Number:
Permit Holder:John&Sarah Loudermilk
Mailing Address: 1233 W.Pierce Street,Houston TX 77019
Contact Person: See Applicant Phone:
Plan Prepared By: David Lervik,PE
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 _X Turf _Undisturbed native vegetation
X Planting Beds Other
SQUARE FOOTAGE OF THIS AREA:4.000 square feet
SCARIFICATION 12"inches(depth)of scarification needed to achieve finished total 12"loosened
X Subsoil will be scarified depth.
PRE-APPROVED AMENDMENT 6 inches of compost or imported topsoil
METHOD: applied PRODUCT:Imported topsoil
X Topsoil import X 3.1(conversion factor,inches to cubic
Amend with compost yards)
Stockpile and amend 18.6=cubic yards per 1,000 sq.ft. QUANTITY:75 CU.YDS.
cu.yds.stockpiled) X 1,000s sq.ft.in this area
=cubic yards of amendment 4 4 4
(needed to cover this area to designated
depth)
CUSTOM AMENDMENT Attach test results and calculations.
Topsoil import inches organic matter or topsoil PRODUCT:
Topsoil&compost lift import
Amend X 3.1
Stockpile and amend =cu.yards/1,000 sq.ft. QUANTITY: CU.YDS.
( cu.yds.stockpiled) X ,000s sq.ft.in this area
=cubic yards of amendment 4 4 4
MULCH ,000 sq.ft.
X 6.2(conversion,to give 2 inch mulch PRODUCT:
depth)
=cubic yards of mulch 4 4 4 4 4 QUANTITY: CU.YDS.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TOTAL AMENDMENT/TOPSOIL/MULCH FOR ALL AREAS
Provide summary of all proposed soil amendments from all sheets completed.
Product#1: Quantity: cu.yds.
Test Results: %organic matter C:N ratio "Stable"(yes/no)
Product#1: Quantity: cu.yds.
Test Results: %organic matter C:N ratio "Stable"(yes/no)
Product#1: Quantity: cu.yds.
Test Results: %organic matter C:N ratio "Stable"(yes/no)
Note:
The C:N ratio must be>25:1,except for Mulch,and may be<35:1 for native plants
Date: Inspector: Approved: Revisions Required:
Date: Inspector: Approved: Revisions Required:
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
APPENDIX 4— Determining Construction Site Sediment Damage Potential (Appendix 7 — NPDES Phase
II Permit)
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Western Washington Phase II Stormwater Permit
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.
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.
STEP 2 — Hydraulic Nearness Assessment
Sites are hydraulically near a feature if the pollutant load and peak quantity of runoff from the site will not
be naturally attenuated before entering the feature. The conditions that render a site hydraulically near
to a feature include, but are not limited to, the following:
i. The feature or a buffer to protect the feature is within 200 feet downstream of the site.
ii. Runoff from the site is tight-lined to the feature or flows to the feature through a channel
or ditch.
August 1, 2013, Modified January 16, 2015 Appendix 7- Determining Sediment Damage
Potential Page 1 of 3
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
A site is not hydraulically near a feature if one of the following takes place to provide attenuation
before runoff from the site enters the feature:
i. Sheet flow through a vegetated area with dense ground cover
ii. Flow through a wetland not included as a sensitive feature
iii. 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.
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.
CONDITION VALUE Y/N SCORE
A.Existing slope of site(average,weighted by aerial extent):
2%or less 0
>2-5% 5
>5-10% (7.8%+/-) 15 X 10
>10-15% 30
>15% 50
B.Site Area to be cleared and/or graded:
<5,000 sq.ft. 0 X 0
5,000 sq.ft.-1 acre 30
>1 acres 50 50
C.Quantity of cut and/or fill on site:
<500 cubic yards 0 X 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 X 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- 10
SC,SP-SM,SP-SC)
GM,GC,SM,SC soils 20 GM 20
ML,CL,MH,CH soils 40
F.Surface or Groundwater entering site identified and intercepted:
Yes 0 X 0
No 25
G.Depth of cut or height of fill>10 feet:
Yes 25
No 0 X 0
H.Clearing and grading will occur in the wet season(October 1 -May 1):
Yes 50 X 50
No 0
TOTAL POINTS: 90
1 If no surface or groundwater enters site, give 0 points.
APPENDIX 5— Site Plan with all applicable information (Minimum Size 11x17 at a legible scale)
SEE ATTACHED.
APPENDIX 6 — Documented Site Photos (Show all directions of the site, including frontage)
Front, facing North
,.Vaix �'' '
_`' .se r... ;d
�• r
rill I wf.;._•
4g 1* - , ...., . '''L -7-4,- .'
..
West property line, facing NW-ish
,r,
- ,, i - 4 .
..
fl- la
East property line, facing NE
r
•
Facing south toward front of lot.
-,•
1 -`-
•�' 1' f _. . A
Photos taken by: D.Lervik
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.
* * * * * NOTAPPLICABLE * *
A PORTION OF SW 4 OF THE SW a SECTION 22, TOWNSHIP 35 N, RANGE 01 E
Pori if
Anoco rte s
Anacvrte's ABBREVIATIONS: SITE INFORMATION
Cap
LL Santc SITE ADDRESS: 2805 GRADY LANE
CB CATCHBASIN ANACORTES, WA
g 13ln•SL-� Park
03'�``'R� 1 5rh S CO CLEANOUT
-� Vole�.nraer 17rh S1 DI DUCTILE IRON
.il
E EAST TAX ID NUMBER: P126317
* (----7-..z.. 4 EOA EDGE OF ASPHALT (PAVEMENT)
7 L V
EP EDGE PAVEMENT CURRENT ZONING: R-2
EX/ EXST EXISTING TOTAL SITE AREA: 7,853 SQUARE FEET
Woi I,inyrc,r, Skyline .31"d`t i FF FINISHED FLOOR
34th8f OWNER/APPLICANT
Palk Manna d ��, FG FINISHED GROUND
9=ach N Anaconaa
s_ C.nmmunity w.4qo FL FLOW LINE
7�CPSQ. Forest Lando Tenoro
a C. R�iningand IE INVERT ELEVATION SARAH & JOHN LOUDERMILK
-I? Marketing Cy
fi INTX INTERSECTION 1233 W PIERCE STREET
- _ T. LT LEFT HOUSTON, TX 77019
• OFF OFFSET
t:ii Ifs Bl1ITG}5'S / '�/1 of , - - '_ 1, A.
Falk lSCif , FL z . i NTE1+tlS3d P PIPE CONTACT PERSON
f. PC POINT OF CURVATURE
. ' D'/Kin Al. SEE OWNER/APPLICANT
,4 ? (TANGENT/CURVE INTERSECTION)
P $ 308r EEerpnnnes PERF PERFORATED PROJECT ENGINEER
• z PT POINT OF TANGENCY
_7 (CURVE/TANGENT INTERSECTION) David A Larvik, PE
t 3-iFixas RJ
RT RIGHT Lervik Engineering
tonAti=n0 ' I SD STORM DRAIN PO Box 684
1—� _ r--I SDCB STORM DRAIN CATCH BASIN Anacortes, WA 98221
IL._ I 111 SDMH STORM DRAIN MANHOLE 360.588.1592
SS SANITARY SEWER
SSMH SANITARY SEWER MANHOLE LEGAL DESCRIPTION
9�a„„P .w — . . =r.__''� STA STATION
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(NTS)
• 11I1 If �_—:- 11
r11 � I SITUATE IN THE CITY OF ANACORTES
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-, � COUNTY OF SKAGIT, STATE OF WASHINGTON.
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�. —� .v - , \ \ r C2 STORMWATER SITE PLAN
):___ '4?-.,, —• Ir_l it,„t,.
- �'� �ti�r. , y�1 7 .<. C3 EROSION CONTROL PLAN & DETAILS
r _ : , C4 SWPPP
— ' 1' f / - ]: C5 BMP T5.13 APPLICATION
,-t y , = --,/' 1� PFN:
=P4i4 .--. l � _-_ '- . `� ..� LERVIK E \ GI \ EERI \ G
e -lt „4 ,:, '--{ PO BOX 684 ANACORTES, WA 98221 360.588.1592
1 ' LOUDERMILK RESIDENCE
1
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VICINITY MAP 2805 GRADY LANE, ANACORTES
(NTS) DATED: 19 SEPTEMBER 2020 COVER SHEET X
A PORTION OF SW a OF THE SW a SECTION 22, TOWNSHIP 35 N, RANGE 01 E
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PROPERTY LI E sD . �D
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PROPERTY LINE CD LU K i\ `
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° — .6,£ LERVIK ENGINEERING
d PO BOX 684 ANACORTES, WA 98221 360.588.1592
lir' .. LOUDERMILK RESIDENCE
* ' ;s RCIIST ` � 2805 GRADY LANE, ANACORTES
SiONA L E`vG X
DATED: 19SEPTEMBER2020 STORMWATER SITE PLAN
DRIVEWAY SHALL MEET THE A PORTION OF SW a OF THE SW a SECTION 22, TOWNSHIP 35 N, RANGE 01 E
REQUIREMENTS OF THE
PERMITTING AGENCY �....
P I IIIIIII IT IS RECOMMENDED THAT THE �� �/ \ ` /
/ 1 \
��OPp�'�IIII��III ENTRANCE BE CROWNED SO THAT ` � 11l99'01 10'�IAL�� ,�
`�y\S rI �• �• �• �_ RUNOFF DRAINS OFF THE PAD !���jj VV� / /i= / 4 / ` ::::7 �' / / � /�(
Y r� I 0 0 0_%,Dom+i .-X�LL / %i 1-x= i D47 doi
111111�����Al� ����W���� MIN �� i i i i i i i i � i i i i i / / L
W -7 / TTT'1T �7 TTT fi /' /
. ti ti .' I / / / / / eoNI C yJ OC IN IDF iIf �/ / /l \ /
—' / i i i i i i 7,
♦I. ���������� SILT FENCE,OR i i _ /,�G� I � i, � � /� /
.•�������j��, WHERE NO RISK OF SEDIMENT ' Ti , •' /
INSTALL DRIVEWAY CULVERT,• 0 ORANGE CONSTRUCTION FENCE i' i . ,y��i i/ / i j/ - e� i o
IF ROADSIDE DITCH PRESENT .• . . �� /, / / �� \L
}�
4"-8"QUARRY SPACES � •_� j�� TRANSPORT. /4 �� 00 / ��
., f ." - �L
��►��!��t 15'MIN (TYP.ALL SIDES) 1 I� / ��
GEOTEXTILE �� II 1 I' ,t
of
12"MIN�PROVIDE FULL WIDTH OF `a�i ' �,' �1,'INGRESS/EGRESS AREA SCALE 1"=20' E r / P1263I i�/ / , J`
(' LOUDER ILK �
m TEMPORARY GRAVEL CONSTRUCTION ENTRANCE(BMP C105) //// ///// ///////////////////////////. � 2805 GRA Y LANE III � � ^` \`
v Not to Scale ��///� �///0 20 7�853 SF —i ,/c, \ ��
JOINTS IN FILTER FABRIC SHALL BE SPLICED (0.180 ACRES) — �i
AT POSTS.USE STAPLES,WIRE RINGS OR
/— /
_______ffii____
EQUIVALENT TO ATTCH FABRIC TO POSTS / / " i / / �— � \
2"x2"BY 14 Ga.WIRE OR i� ' j r
'` ' `�
EQUIVALENT,IF STANDARD STRENGTH �� �� ��/l
/ / :i \
FABRIC IS USED i
I `1
FILTER FABRIC c
24"MIN RESTRICT TRUCK TRAFFIC � I f'� J
........:....................... / DURING EXCAVATION TO ' ��"==
AVOID TRACKING MAT L soil •. .•. .•. ... //Ri. J�
j�//\ \ ONTO STREETS ''a sPP P y 'II % 4
i / / O
—Th\Z---
MINIMUM 4"x4"TRENCH \\j ��� � /\ `Z :::::
/ s.
12"MIN \/ / I A STO• -ICE
•
- 6'MAX - \ \
BACKFILL TRENCH WITH NATIVE SOIL \ '\ VI r-' -.•_
— —sN OR y"-1i"WASHED GRAVEL Va .g _.,� �r
y :iiii_ ' % % •7:) ��
.-,•,-..
POST SPACING MAY BE INCREASED �4�I��1;�
2"x2"WOODEN POSTS,STEEL FENCE '-,.�.-,..- rz..7
TO 8'IF WIRE BACKING IS USED \
POSTS,OR EQUIVALENT �� t��'j' \
1�1�I �
®SILT FENCE DETAIL(BMP C233) pCB �' ";•': 7� \j ARISCSFF�
Not[o Scale —R=50' ��� ' -.•' f 8,301 SF — —
INLET PROTECTION CONSTRUCTION ENTRANCE
BMP C220 _ BMP C105
Catch Basin filter insert % PARKING AREA
GullyWasher Filter Sack(QPL Code 3001) - \ BMP C107
byor
Aqua Treatment Systems, Kent WA
or appoved equal \ _...\ — /\
18" Gravel(12"Min. Depth) \
Min /
� 8 o uks)v°°o° B 0,* 000 V °pvo:�
044'0,) �:•: bg0 o gC o ORANGE CONST. FENCE (BMP C133) OB
o� o �0�1• 004.� 00.0corouo00_
0 0 ° �0 0 00 ._°O_°_0_°���1•1• o °orb
!�\/\ \ ° �°°o� ��° c � r Q�� SILT FENCE (BMP C233) SF sF
\ \\/ /\'/ //;/ / //V / /"\;
. \\ PRESERVED VEGETATION '/, /. '/. '/. '/.
BMP C101 & BMP C121' , .\� AND/OR SOIL STABILIZATION . . . . —
.,:. \<
// ,� PFN:
`Catch Basin NOTE: NOT ALL "RECOMMENDED BMPS" LISTED IN THE SWPPP (SEE SHEET `' L E R V I K ENGINEERING
Filtered Water
C4) WILL BE REPRESENTED ON THE TEMPORARY EROSION CONTROL >` PO BOX 684 ANACORTES, WA 98221 360.588.1592
m INLET PROTECTION(BMP C220) PLAN. THE SWPPP SIMPLY LISTS THE BMPS THAT ARE REASONABLE ?,, LOUDERMILK RESIDENCE
v Not to Scale AND APPROPRIATE FOR THE SITE AND THE ANTICIPATED TYPES OF . i 32799 , 2805 GRADY LANE, ANACORTES
�; / ISTER `'C
WORK. OTHER BMPS LISTED MAY BE EMPLOYED SHOULD SITE s-ioNALE,� TEMPORARY EROSION AND SEDIMENT y
CONDITIONS, TYPES OF WORK OR WEATHER CONDITION DICTATE. DATED: 19SEPTEMBER2020 CONTROL PLAN
A PORTION OF SW 4 OF THE SW a SECTION 22, TOWNSHIP 35 N, RANGE 01 E
MINIMUM REQUIREMENT#2: STORM WATER POLLUTION PREVENTION PLAN stormwater infiltration,unless infeasible. BMP C204:Pipe Slope Drains TESC Element#10:Control De-Watering Element 13:Protect Low Impact Development BMPs
Where feasible,design outlet structures that withdraw impounded BMP C205:Subsurface Drains
NOTE: Not all"Recommended BMPs"listed below will be represented on BMP C206:Level Spreader Discharge foundation,vault,and trench dewatering water,which have The primary purpose of On-Site Stormwater Management is to reduce the
stormwater from the surface to avoid discharging sediment that is still
the Temporary Erosion Control Plan.This report simply lists the BMPs that similar characteristics to stormwater runoff at the site,into a controlled disruption of the natural site hydrology through infiltration.BMPs used to
suspended lower in the water column. BMP C207:Check Dams
are reasonable and appropriate for the site and anticipated types of BMP C208:Triangular Silt Dike(TSD) conveyance system before dis-charge to BMP C240:Sediment Trap or BMP meet 1-3.4.5 MR5:On-Site Stormwater Management(often called LID BMPs)
work.Other BMPs listed may be employed should site conditions,types of Recommended BMPs: C241:Sediment Pond(Temporary). are permanent facilities.
work or weather condition dictate. BMP C233:Silt Fence TESC Element#7:Drain Inlet Protection Discharge clean,non-turbid dewatering water,such as well-point ground Protect all LID BMPs(including,but not limited to BMP T7.30:Bioretention,
TESC Element#1:Preserve Vegetation/Mark Clearing Limits Other Available BMPs: Drain inlets installed by this project will be protected from sediment-laden water,to systems tributary to,or directly into surface waters of the State,as BMP T5.14:Rain Gardens,and BMP T5.15:Permeable Pavements)from
Before beginning land disturbing activities,including clearing and grading, flows,and directed to sediment trapping facilities. specified in Element 8:Stabilize Channels and Outlets,provided the sedimentation through installation and maintenance of erosion and
clearlymark all clearinglimits,sensitive areas and their buffers,and trees BMP C231: Brush Bonier dewatering flow does not cause erosion or flooding of receiving waters.Do sediment control BMPs on portions of the site that drain into the LID BMPs.
BMP C232:Gravel Filter Berm Recommended BMPs not route clean dewatering water through stormwater sediment BMPs.Note Restore the BMPs to their fully functioning condition if they accumulate
that are to be preserved within the construction area. BMP C220:Inlet Protection that"surface wafers of the State"may exist on a construction site as well as sediment during construction.Restoring the BMP must include removal of
BMP C234:Vegetated Strip running off site:for example,a creeka site. sediment and any the duff layer,native top soil,and natural vegetation in an p through g sediment-laden with
Bioretention/Rain meeting
dGarden soils,and
undisturbed state to the maximum degree practicable. BMP C235:Wattles TESC Element#8:Stabilize Channels and Outlets replacing the removed soils with soils meeting the design specification.
BMP C240:Sediment Trap Handle highly turbid or otherwise contaminated dewatering water
Plastic,metal,fabric fence,or other physical barriers may be used to mark BMP C241:Sediment Pond(Temporary) The best method for stabilizing channels is to completely line the channel separately from storm-water. Maintain the infiltration capabilities of LID BMPs by protecting against
the clearing limits.Note the difference between the practical use and BMP C250:Construction Stormwater Chemical Treatment with BMP C122:Nets and Blankets first,then add BMP C207:Check Dams as compaction by construction equipment and foot traffic.Protect completed
necessaryto function as an anchor and to slow the flow of water. Other dewatering treatment or disposal options may include:
proper installation of BMP C233:Silt Fence and the proper use and BMP C251:Construction Stormwater Filtration lawn and landscaped areas from compaction due to construction
installation of BMP C103:High-Visibility Fence. Recommended BMPs: • Infiltration. equipment.
TESC Element#5:Soil Stabilization Control erosion and avoid introducingsediment from surroundingland uses
If it is not practical to retain the duff layer in place,then stockpile it on site, No BMPs proposed.No channels are proposed with this project. • Transport off site in a vehicle,such as a vacuum flush truck,for legal
cover it to prevent erosion,and replace it immediately when you finish Stabilize exposed and unworked soils by application of effective BMPs that disposal in a manner that does not pollute state waters. onto BMP T5.15:Permeable Pavements.Do not allow muddy construction
disturbing the site. prevent erosion.Applicable BMPs include,but are not limited to:temporary Other Available BMPs: equipment on the base material or pavement.Do not allow sediment-laden
• Ecology-approved on-site chemical treatment or other suitable runoff onto
and permanent seed-ing,sodding,mulching,plastic covering,erosion permeable pavements or base materials.
Recommended BMPs BMP C122:Nets and Blankets treatment technologies.
control fabrics and matting,soil application of polyacrylamide(PAM),the BMP C202:Riprap Channel Lining Permeable pavement fouled with sediments or no longer passing an initial
BMP C101:Preserve Natural Vegetation early application of gravel base on areas to be paved,and dust control. • Sanitary or combined sewer discharge with local sewer district infiltration test must be cleaned usingprocedures in accordance with this
BMP C102:Buffer Zones BMP C207:Check Dams approval,if there is no other option.
Control stormwater volume and velocity within the site to minimize soil BMP C209:Outlet Protection p manual or the manufacturer's procedures.
BMP C103:High Visibility Plastic Fencing erosion. • Use of a sedimentation bag that discharges to a ditch or swale for small Keep all heavy equipment off existing soils under LID BMPs that have been
BMP C232:Silt Fence TESC Element#9:Control Pollutants volumes of localized dewatering. excavated to final grade to retain the infiltration rate of the soils.
Control stormwater discharges,including both peak flow rates and total
TESC Element#2:Establish Construction Access Route stormwater volume,to minimize erosion at outlets and to minimize Design,install,implement and maintain effective pollution prevention Recommended BMPs: Recommended BMPs
downstream channel and streambank erosion. measures to minimize the discharge of pollutants.The project proponent
Limit construction vehicle access and exit to one route,if possible. must: No de-watering is proposed for this project. None recommended;no LID elements proposed.
Stabilize access points with a pad of quarry spoils,crushed rock,or other Soils must not remain exposed and unmarked for more than the time periods Handle and dispose Sequivalent with
za ofof sediment crushed
k,o set forth below to prevent erosion: of all pollutants,including waste materials and Other Available BMPs: Other Available BMPs:
tracking publicdemolition debris that occur on site in a manner that does not cause
• During the dry season(May 1-September 30):7 days contamination of stormwater. BMP C203:Water Bars BMP C102:Buffer Zones
Locate wheel wash or tire baths on site,if the stabilized construction BMP C236:Vegetative Filtration BMP C103:High-Visibility Fence
entrance is not effective in preventing tracking sediment onto roads. • During the wet season(October 1-April 30):2 days Provide cover,containment,and protection from vandalism for all
chemicals,liquid products,petroleum products,and other materials that TESL Element#I1:Maintain BMPs BMP C200:Interceptor Dike and Swale
If sediment is tracked off site,clean the affected roadway(s)thoroughly at Stabilize soils at the end of the shift before a holiday or weekend if needed BMP C201:Grass-Lined Channels
the end of each day,or more frequently as necessary(for example,during based on the weather forecast. have the potential}o pose a threat to human health or}he environment. Maintain and repair all temporary and permanent erosion and sediment
wet weather).Remove sediment from roads by shoveling,sweeping,or On-site fueling tanks must include secondary containment.Secondary control BMPs as needed to assure continued performance of their intended BMP C207:Check Dams
Stabilize soil stockpiles from erosion,protect with sediment trapping containment means placing tanks or containers within an impervious function in accordance with BMP s BMP C208:Triangular Silt Dike(TSD)
picking up and transporting the sediment to a controlled sediment disposal measures,and where possible,locate away from storm drain inlets, structure capable of containing 110%of the volume contained in the largest pecifica}ions. BMP C231:Brush Bonier
area. waterways and drainage channels. tank within the containment structure.Double-walled tanks do not require Remove all temporary erosion and sediment control BMPs within 30 days
Y 9 q BMP C233:Silt
Stri Fence
Conduct street washing only after sediment is removed in accordance with additional secondary containment. after achieving final site stabilization or after the temporary BMPs are no
2.d(above). Minimize the amount of soil exposed during construction activity. longer needed. BMP C234:Vegetated
g p
Minimize the disturbance of steepslopes. Conduct maintenance,fueling,and repair of heavy equipment and
Control street wash wastewater by pumping back on site,or otherwisevehicles using spill prevention and control measures.Clean contaminated Recommended BMPs:
prevent it from dis-charging into systems tributary to waters of the State. Minimize soil compaction and,unless infeasible,preserve topsoil. surfaces immediately following any spill incident. BMP C150:Materials on Hand
NOTE:Small sites such as this with minimal need for vehicular access around the Recommended BMPs Discharge wheel wash or tire bath wastewater to a separate on-site Other Available BMPs:
site may employ a gravel access pad smaller than that shown in the DOE treatment system that prevents discharge to surface wafer,or to the
detail that is located where the future driveway will be placed. BMP C120:Temporary and Permanent Seeding sanitary sewer,with local sewer district approval. BMP C160:Certified Erosion and Sediment Control Lead
BMP C121:Mulching
See plans for location and details of site access. BMP C122:Nets and Blankets Apply fertilizers and pesticides in a manner and at application rates that will TESC Element#12:Manage the Project
Recommended BMPs BMP C123:Plastic Covering not result in loss of chemical to stormwater runoff.Follow manufacturers' Phase development projects to the maximum degree practicable and take
label requirements for application rates and procedures.
BMP C105:Stabilized Construction Access BMP C124:Sodding into account seasonal work limitations.
BMP C107:Construction Road/Parking Area Stabilization Other Available BMPs: Use BMPs to prevent contamination of stormwater runoff by not modifying Inspect,maintain and repair all BMPs as needed to assure continued
sources.The sources for this contamination include,but are not limited to: performance of their intended function.Projects regulated under the
Other Available BMPs: BMP C125:Topsoiling/Composting recycled concrete stockpiles,bulk cement,cement kiln dust,fly ash,new Construction Stormwater General Permit(CSWGP)must conduct site
BMP C106:Wheel Wash BMP C126:Polyacrylamide(PAM)For Soil Erosion Protection concrete washing and curing waters,waste streams generated fromconcrete grinding and sawing,exposed aggregate processes,dewatering inspections and monitoring in accordance with Special Condition S4 of the
BMP C130:Surface Roughening concrete vaults,concrete pumping and mixer washout waters. CSWGP.
TESL Element#3:Flow Rate Controls BMP C131:Gradient Terraces Maintain,update,and implement the Construction SWPPP.
BMP C140:Dust Control Adjust the pH of stormwater if necessary to prevent violations of water
Protect properties and waterways downstream of development sites from quality standards. Projects that disturb one or more acres must have site inspections
erosion and the associated discharge of turbid waters due to increases in TESC Element#6:Slope Protection&Stabilization conducted by a Certified Erosion and Sediment Control Lead(CESCL).
Assure that washout of concrete trucks is performed off site or in designated
the velocity and peak volumetric flow rate of stormwater runoff from the Design and construct cut-and-fill slopes in a manner to minimize erosion. concrete washout areas only.Do not wash out concrete truck drums or Project sites disturbing less than one acre may have a CESCL or a person
project site. Applicable practices include,but are not limited to,reducing continuous concrete handing equipment onto the ground,or into storm drains,open without CESCL certification conduct inspections.By the initiation of
Where necessary to comply with 3.0(above),construct stormwater length of slope with terracing and diversions,reducing slope steepness,and ditches,streets,or streams.Washout of small concrete handling equipment construction,the Construction SWPPP must identify the CESCL or inspector,
infiltration or detention BMPs as one of the first steps in grading.Assure that roughening slope surfaces(for example,track walking). may be disposed of in a formed area awaiting concrete where it will not who must be present on site or on-call at all times.
detention BMPs function properly before constructing site improvements contaminate surface or ground water.Do not dump excess concrete on The project manager must ensure that the project is built in such a way to
Divert off-site stormwater(run-on)or ground water away from slopes and
(e.g.,impervious surfaces). disturbed areas with interceptor dikes,pipes and/or swales.Off-site site,except in designated concrete washout areas.Concrete spillage or comply with all Construction SWPPP Elements,as detailed in this section.
If permanent infiltration BMPs are used for temporary flow control during stormwater should be man-aged separately from stormwater generated on concrete discharge directly to ground wafer or surface waters of the State is Considerations for the project manager include,but are not limited to:
site. prohibited.Do not wash out to formed areas awaiting infiltration BMPs.
construction,protect these BMPs from siltation during the construction • Construction phasing
phase. At the}op of slopes,collect drainage in pipe slope drains or protected Obtain written approval from Ecology before using chemical treatment
• Seasonal work limitations
Recommended BMPs: channels to prevent erosion.Temporary pipe slope drains must be sized to
other than CO2,dry ice,or food grade vinegar to adjust pH.
convey the flow rate calculated by one of the following methods: Uncontaminated water from water-only based shaft drilling for construction • Coordination with utilities and other contractors
None proposed.Runoff will continue to leave the development area as of building,road,and bridge foundations maybe infiltrated provided the
dispersed runoff and is not likely to create erosion. • Single Event Hydrograph Method:The peak volumetric flow rate • Inspection
calculated using a l0-minute time step from a Type IA,10-year.24-hour wastewater is managed in a way that prohibits discharge to surface waters.
Other Available BMPs: frequency storm. Prior to infiltration,water from water-only based shaft drilling that comes into • Monitoring
BMP C203:Water Bars OR contact with curing concrete must be neutralized until pH is in the range of 6.5 to 8.5(su). . Maintaining an updated construction SWPPP
BMP C207:Check Dams • Continuous Simulation Method:The 10-year peak flow rate,as Recommended BMPs:
an approvedRecommended BMPs:
BMP C209:Outlet Protection determined by
continuous runoff model with a 15-minute BMP C150:Materials on Hand
BMP C235:Wattles time step. BMP C151:Concrete Handling BMP C162:Scheduling
BMP C240:Sediment Trap The hydrologic analysis must use the existing land cover condition for BMP C154:Concrete Washout Area
BMP C241:Sediment Pond(Temporary) predicting flow rates from tributary areas outside the project limits.For Other Available BMPs: Other Available BMPs:
See also V-12 Detention BMPs tributary areas on the project site,the analysis must use the temporary or BMP C160:Certified Erosion and Sediment Control Lead
permanent project land cover condition,whichever will produce the highest BMP C152:Sawcutting and Surfacing Pollution Prevention
TESL Element#4:Sediment Controls flow rates.If using the Western Washington Hydro-logy Model(WWHM)to BMP C153:Material Delivery,Storage,and Containment
Design,install,and maintain effective erosion controls and sediment controls predict flows,bare soil areas should be modeled as"landscaped"area. BMP C250:Construction Stormwater Chemical Treatment
to minimize the discharge of pollutants. Place excavated material on the uphill side of trenches,consistent with BMP C251:Construction Stormwater Filtration
Construct sediment control BMPs(sediment ponds,traps,filters,etc.)as one safety and space considerations. BMP C252:Treating and Disposing of High pH Water
of the first steps in grading.These BMPs must be functional before other land Also see the Source Control BMPs detailed in Volume IV
disturbing activities take place. Place check dams at regular intervals within constructed channels that are
cut down a slope.
Minimize sediment discharges from the site.The design,installation and Recommended BMPs:
maintenance of erosion and sediment controls must address factors such as D C I•
the amount,frequency,intensity and duration of precipitation,the nature of No BMPs proposed.Cut/fill slopes to be very minor in nature and will be r I I�J
resulting stormwater runoff,and soil characteristics,including the range of restricted to the area immediately around the proposed foundations. T /T 7y�,
soil particletstormwater
sizes expected from
m be presented the sitethrough
: A1lif 9ri
L E R Y I K ENGINEERING
Other Available BMPs:
Direct siormwater runoff from disturbed areas}hrou h BMP C241:Sediment
Pond(Temporary)or other appropriate sediment removal BMP,before the BMP C120:Temporary and Permanent Seeding
runoff leaves a construction site or before discharge to an infiltration facility. BMP C121:Mulching __ F PO BOX 684 ANACORTES, WA 98221 360.588.1592
Runoff from fully stabilized areas may be discharged without a sediment BMP C122: Nets and Blankets ' r
removal BMP,but must control flow rates per Element 3:Control Flow Rates. BMP C123: Plastic Covering sr/ LO U D E R M I L K RESIDENCE
Locate BMPS intended to trap sediment on site in a manner to avoid BMP C124:Sodding /
interference with the movement of juvenile salmonids attempting to enter BMP C130:Surface Roughening • r•, 37799 - 2805 G RA DY LANE, ANACORTES
off-channel areas or drainages. BMP C131:Gradient Terraces y �s RQ:ISTgl ti� A
Provide and maintain natural buffers around surface waters,direct BMP C200:Interceptor Dike and Swale sIO1VA L��G STORM W AT E R POLLUTION PREVENTION A
stormwater to vegetated areas to increase sediment removal and maximize BMP C201:Grass-Lined Channels
BMP C203:Water Bars
DATED: 19 SEPTEMBER 2020 PLAN 5
A PORTION OF SW 4 OF THE SW a SECTION 22, TOWNSHIP 35 N, RANGE 01 E
, 10' 'IVATE
`� � STORM SA4i�Lt \ 6' ' .STORGI BMP T5.13:Post-Construction Soil Quality and Design Guidelines through use of composted materials
/ 1 \ 20'BL�G 4"Sf STUB •` Depth •Sail retention.Retain,in an undisturfoed meeting{a.)above;or other organic materials
• SQ 2. 10; - TBAC Purpose and Definition state,the duff layer and native topsoil to the amended to meet the carbon to
`� Naturally occurring{undisturbed)soil and maximum extent practicable.In any areas nitrogen ratio requirements,and meeting the
/� ` •— ` vegetation provide important stormwater requiring grading remove and stockpile the contaminant standards of Grade A
SD . ��D functions including:water infiltration;nutrient, duff layer and topsoil on site in a designated, Compost.
...----•
, � sediment,and pollutant adsorption; controlled area,not adjacent to public The resulting soil should be conducive to the
— — — — / —� - sediment and pollutant biofiltrotion;water resources and critical areas,to be reapplied to type of vegetation to be established.
/ interflow storage and transmission;and other portions of the site where feasible. Implementation Options:
r _ CONNECT T FOOTING DRAIN I..,
/f / pollutant decomposition.These functions are •Soil quality.All areas subject to clearing and
grading that have not been covered by The soil quality design guidelines listed above
I I largely lost when development strips away can be met by using one of the methods
— — �� �C, `� / native soil and vegetation and replaces it with Impervious surface,Incorporated Into a listed below:
-------------
7.5"BL I vQ / minimal topsoil and sod.Not only are these drainage facility or engineered as structural fill I I.Leave undisturbed native vegetation and sail,
ACK Ari, I / A� fir! important stormwater functions lost,but such or and protect from compaction during
` / �. landscapes themselves become pollution slope shalL at project completion,demonstrate construction.
ii• • . . �,� generating pervious surfaces due to increased the following: 2.Amend existing site topsail or subsoil either of
•316 /� / `� use of pesticides,fertilizers and other I.A topsoil layer with a minimum organic matter default"pre-approved"rates,or at
SON / landscaping and household/industrial content of 10%dry weight in planting custom calculated rates based on tests of the
chemicals,the concentration of pet wastes, beds,and 5%organic matter content in turf soil and amendment.
3 SF •
f and areas,and a pH from 6.0 to 8.0 or 3.Stockpile existing topsoil during grading,and
M.
ACRES) P 1263 7 • /26 pollutants that accompany roadside litter. matching the pH of the undisturbed soil.The replace it prior to planting.Stockpiled
LOUDER ILK / 5,13286 Establishing soil quality and depth regains topsoil layer shall have a minimum deplih topsoil must also be amended if needed to
! 2805 GRAY LANE I/ ' / SETS greater stormwater functions in the post of eight inches except where tree roots limit the meet the organic matter or depth
T. 7,853 SF I development landscape,provides increased depth of incorporation of requirements,either at a default"pre approved"
b E ‘ ,.•.• (0.180 ACRES) treatment of pollutants and sediments that amendments needed to meet the criteria. rate or at a custom calculated rate.
l ` result from development and habitation,and Subsoils below the topsoil layer should be 4.Import topsoil mix of sufficient organic
C � I • . _ `\3p` ` minimizes the need for some landscaping scarified at least 4 inches with some content and depth to meet the requirements.
�_ �� chemicals,thus reducing pollution through incorporation of the upper material to avoid More than one method maybe used on
'•' ••'•• ••'•• •• • • • • ,` O `� prevention, stratified layers, feasible. different portions of the same site.Soil that
• • • depthis with 2 inches of organic matter
where F/1 �� Applications and Limitations 2.Mulch plantingbedsor a already meets the depth and organic
j C� \ Establishing a minimum soil quality and material quality standards,and is not compacted,
not the same as preservation of naturally 3.Use compost and other materials that meet does not need to be amended.
• • / — _i ` occurring soil and vegetation.However, these organic content requirements: Local governments are encouraged to adopt
`. • • • .` .`.` `. •, / •- establishing a minimum soil quality and depth a.The organic content for"pre-approved" guidelines and procedures similar to those
` ` �o J will amendment rates can be met only using recommended in Guidelines and Resources For
• •• provide improved on-site management of compost that meets the definition of Implementing Soil Quality and Depth BMP
••`•`•`• • • • • -p�� C; stormwater flow and water quality. "composted materials"in WAC 173-350-1 00. T5.13 in WDOE Stormwater Management
• ,�� J Soil organic matter can be attained through This code is available online at: Manual for Western Washington.This document
Q numerous materials such as compost. http://apps.leg.wa.gov Is available at:
�, • • - . ' cam posted woody material,biosolids,and /wac/default.aspx?clte= 173-350 http://www.sollsforsalmon.org/pdf/Soii_BMP
'.• `•` forest product residuals.It is important that the The compost must also have an organic matter Manual.pdf
— — _ ems, •••••• materials used to meet the soil quality and content of 40%to 65%,and a Maintenance
\ depth BMP be appropriate and beneficial to carbon to nitrogen ratio below 25:1. •Establish soil quality and depth toward the
,'':'-:,"•:" :' ': the plant cover to be established.Likewise,it is The carbon to nitrogen ratio may be as high as end of construction and once established,
`� \ > important that imported topsoils improve 35:1 for plantings composed protect from compaction,such as from large
soil conditions and do not have an excessive entirely of plants native to the Puget Sound machinery use,and from erosion.
•••`.` `•` percent of clay fines. Lowlands region. •Plant vegetation and mulch the amended soil
_ '• '„ • • �u'S� �_ This BMP can be considered infeasible on till sail b.Calculated amendment rates may be met area after installation.
�• •• • ,-';; ,, slopes greater than 33 percent. •Leave plant debris or its equivalent on the soil
C 9: ,- <`." �/ -� surface to replenish organic matter.
.,*,.• P126319 •Reduce and adjust,where possible,the use of
CB At. ARTS irrigation,fertilizers,herbicides and
\ `'`` \ 8,301 F�-
-50 •
�. pesticides.rather than continuing to implement
9 , • �...�� ` - ! (0,1 CRQ'S) • formerly established practices.
i -\
_ ,
• -\ — -
- - SCALE 1"-20'
N—, �� SSMH \-- — . . 0 20
•
I \ �140 __
-b L \
�� / SEE SHEET C5 FOR
—( N. — SITE CROSS-SECTIONS
CORRESPONDING TO THE PFN:
"N-S"AND "E-W" MARKERS ,'
AREAS FOR APPLICATION ' ,67 : LERVIK ENGINEERING
` ` PO BOX 684 ANACORTES, WA 98221 360.588.1592
OF BMP T5.13 . Pf ,,
(9,500± SF) • • • ' • ' • • - R :,2,9A� LOUDERMILK RESIDENCE
,, Q:1ST{;R ,G`s 2805 GRADY LANE, ANACORTES
%NAL E _
DATED: 19 SEPTEMBER 2020 BMP T5.13 APPLICATION X