19-074-RPT-CSWPPP-2025.01.06 (2141)Construction Stormwater General Permit
Stormwater Pollution Prevention Plan
(SWPPP)
for
Deutscher – Yelm Commercial
Prepared for:
The Washington State Department of Ecology
Southwest Regional Office
Permittee / Owner Developer Operator / Contractor
Marijke Deutscher TBD TBD
15142 Berry Valley Road, Yelm, WA 98597
Certified Erosion and Sediment Control Lead (CESCL)
Name Organization Contact Phone Number
TBD TBD TBD
SWPPP Prepared By
Name Organization Contact Phone Number
Ahmad Kamyab Hatton Godat Pantier, Inc. (360) 943-1599
SWPPP Preparation Date
January 6, 2025
Project Construction Dates
Activity / Phase Start Date End Date
Permit Spring 2025 Fall 2026
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Table of Contents
1 Project Information .............................................................................................................. 4
1.1 Existing Conditions ...................................................................................................... 4
1.2 Proposed Construction Activities .................................................................................. 4
2 Construction Stormwater Best Management Practices (BMPs) ........................................... 6
2.1 The 13 Elements .......................................................................................................... 6
2.1.1 Element 1: Preserve Vegetation / Mark Clearing Limits ........................................ 6
2.1.2 Element 2: Establish Construction Access ............................................................ 6
2.1.3 Element 3: Control Flow Rates ............................................................................. 7
2.1.4 Element 4: Install Sediment Controls .................................................................... 7
2.1.5 Element 5: Stabilize Soils ..................................................................................... 8
2.1.6 Element 6: Protect Slopes..................................................................................... 9
2.1.7 Element 7: Protect Drain Inlets ............................................................................. 9
2.1.8 Element 8: Stabilize Channels and Outlets ..........................................................10
2.1.9 Element 9: Control Pollutants ...............................................................................10
2.1.10 Element 10: Control Dewatering ..........................................................................12
2.1.11 Element 11: Maintain BMPs .................................................................................12
2.1.12 Element 12: Manage the Project ..........................................................................13
2.1.13 Element 13: Protect Low Impact Development (LID) BMPs .................................15
3 Pollution Prevention Team .................................................................................................16
4 Monitoring and Sampling Requirements ............................................................................17
4.1 Site Inspection ............................................................................................................17
4.2 Stormwater Quality Sampling ......................................................................................17
4.2.1 Turbidity Sampling ...............................................................................................17
4.2.2 pH Sampling ........................................................................................................19
5 Discharges to 303(d) or Total Maximum Daily Load (TMDL) Waterbodies .........................19
5.1 303(d) Listed Waterbodies ..........................................................................................19
5.2 TMDL Waterbodies .....................................................................................................19
6 Reporting and Record Keeping ..........................................................................................20
6.1 Record Keeping ..........................................................................................................20
6.1.1 Site Log Book ......................................................................................................20
6.1.2 Records Retention ...............................................................................................20
6.1.3 Updating the SWPPP ...........................................................................................20
6.2 Reporting ....................................................................................................................20
6.2.1 Discharge Monitoring Reports ..............................................................................20
6.2.2 Notification of Noncompliance ..............................................................................21
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List of Tables
Table 1 – pH-Modifying Sources ...............................................................................................11
Table 2 – Team Information ......................................................................................................16
Table 3 – Turbidity Sampling Method ........................................................................................17
Table 4 – pH Sampling Method .................................................................................................19
List of Appendices
Appendix/Glossary
A. Site Map
B. BMP Detail
C. Correspondence
D. Site Inspection Form
E. Construction Stormwater General Permit (CSWGP)
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List of Acronyms and Abbreviations
Acronym / Abbreviation Explanation
303(d) Section of the Clean Water Act pertaining to Impaired Waterbodies
BFO Bellingham Field Office of the Department of Ecology
BMP(s) Best Management Practice(s)
CESCL Certified Erosion and Sediment Control Lead
CO2 Carbon Dioxide
CRO Central Regional Office of the Department of Ecology
CSWGP Construction Stormwater General Permit
CWA Clean Water Act
DMR Discharge Monitoring Report
DO Dissolved Oxygen
Ecology Washington State Department of Ecology
EPA United States Environmental Protection Agency
ERO Eastern Regional Office of the Department of Ecology
ERTS Environmental Report Tracking System
ESC Erosion and Sediment Control
GULD General Use Level Designation
NPDES National Pollutant Discharge Elimination System
NTU Nephelometric Turbidity Units
NWRO Northwest Regional Office of the Department of Ecology
pH Power of Hydrogen
RCW Revised Code of Washington
SPCC Spill Prevention, Control, and Countermeasure
su Standard Units
SWMMEW Stormwater Management Manual for Eastern Washington
SWMMWW Stormwater Management Manual for Western Washington
SWPPP Stormwater Pollution Prevention Plan
TESC Temporary Erosion and Sediment Control
SWRO Southwest Regional Office of the Department of Ecology
TMDL Total Maximum Daily Load
VFO Vancouver Field Office of the Department of Ecology
WAC Washington Administrative Code
WSDOT Washington Department of Transportation
WWHM Western Washington Hydrology Model
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1 Project Information
Project/Site Name: Deutscher – Yelm Commercial
Street/Location: 15152 Berry Valley Road
City: Yelm State: WA Zip code: 98597
Subdivision: N/A
Receiving waterbody: Thompson Creek
1.1 Existing Conditions
Total acreage (including support activities such as off-site equipment staging yards, material storage
areas, borrow areas).
Total acreage: 5.36
Disturbed acreage: 2.85
Existing structures: Day Care Building
Landscape topography: The site is generally flat, with slopes ranging from 1% to 3%.
Drainage patterns: In the current condition stormwater runoff in undeveloped areas
sheet flow on-site and infiltrate through native soils. The majority of
the project surrounding areas are developed and there is no off-site
stormwater runoff to the property.
Existing Vegetation: The site Phase 2 area are cleared previously for construction, and it
is covered with native grass.
Critical Areas (wetlands,
streams, high erosion
risk, steep or difficult to
stabilize slopes):
The site is located within category I Critical Aquifer Recharge Area
and is in the ten-year time of travel zone for a Group A well owned
by the City of Yelm.
List of known impairments for 303(d) listed or Total Maximum Daily Load (TMDL) for the receiving
waterbody: N/A
1.2 Proposed Construction Activities
Description of site development (example: subdivision):
Commercial buildings
Description of construction activities (example: site preparation, demolition, excavation):
Clearing, grubbing, installation of new utilities, parking lot, stormwater facilities, and landscaping.
Description of site drainage including flow from and onto adjacent properties. Must be consistent
with Site Map in Appendix A:
Stormwater runoff for the entire site was designed and constructed with Phase 1 “Yelm Day Care”
construction. Runoff from Phase 2 roof areas will be connected to 2 infiltration trenches for 100%
infiltration onsite and runoff from paved parking areas as well as sidewalks will be connected to the
existing infiltration pond for 100% infiltration.
Description of final stabilization (example: extent of revegetation, paving, landscaping):
At project completion, the property will contain 3 commercial buildings, paved parking areas, sidewalks,
landscaping areas, associated utilities.
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Contaminated Site Information:
Proposed activities regarding contaminated soils or groundwater (example: on-site treatment
system, authorized sanitary sewer discharge):
N/A
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2 Construction Stormwater Best Management Practices (BMPs)
The SWPPP is a living document reflecting current conditions and changes throughout the life of the
project. These changes may be informal (i.e., hand-written notes and deletions). Update the SWPPP
when the CESCL has noted a deficiency in BMPs or deviation from original design.
2.1 The 13 Elements
2.1.1 Element 1: Preserve Vegetation / Mark Clearing Limits
To protect adjacent properties and to reduce the area of soil exposed during construction, the limits of
construction will be clearly marked before land-disturbing activities begin. Trees that are to be preserved
shall be clearly delineated, both in the field and on the plans. In general, natural vegetation and native
topsoil shall be retained in an undisturbed state to the maximum extent possible. The BMPs relevant to
marking the clearing limits that will be applied for this project include:
• High Visibility Fence (BMP C103)
Alternate BMPs for marking clearing limits are included in Appendix B as a quick reference tool for the
onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during
construction to satisfy the requirements set forth in the General NPDES Permit (Appendix E). To avoid
potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction
Stormwater permit (as provided in Appendix E), the Certified Erosion and Sediment Control Lead will
promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix B after the
first sign that existing BMPs are ineffective or failing.
2.1.2 Element 2: Establish Construction Access
Construction access or activities occurring on unpaved areas shall be minimized, yet where necessary,
access points shall be stabilized to minimize the tracking of sediment onto public roads, and street sweeping
and street cleaning shall be employed to prevent sediment from entering state waters. The specific BMPs
related to establishing construction access that will be used on this project include:
• Construction Road/Parking Area (BMP C107)
• Existing private road will be used as construction access
The contractor shall install stabilized construction entrances at the locations and per the details shown on
the approved Temporary Erosion and Sediment Control Plans.
Alternate BMPs for establishing construction access are included in Appendix B as a quick reference tool
for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate
during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix E). To
avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES
Construction Stormwater permit (as provided in Appendix E), the Certified Erosion and Sediment Control
Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix B
after the first sign that existing BMPs are ineffective or failing.
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2.1.3 Element 3: Control Flow Rates
In order to protect the properties and waterways downstream of the project site, stormwater discharges
from the site will be controlled. The specific BMPs for flow control that shall be used on this project
include:
• Silt Fence (BMP C233)
• Temporary Sediment Trap (BMP C240)
Alternate flow control BMPs are included in Appendix B as a quick reference tool for the onsite inspector
in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy
the requirements set forth in the General NPDES Permit (Appendix E). To avoid potential erosion and
sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as
provided in Appendix E), the Certified Erosion and Sediment Control Lead will promptly initiate the
implementation of one or more of the alternative BMPs listed in Appendix B after the first sign that
existing BMPs are ineffective or failing.
The project site is located west of the Cascade Mountain Crest. As such, the project must comply with
Minimum Requirement 7 (Ecology 2005). In general, discharge rates of stormwater from the site will be
controlled where increases in impervious area or soil compaction during construction could lead to
downstream erosion, or where necessary to meet local agency stormwater discharge requirements (e.g.
discharge to combined sewer systems).
Will you construct stormwater retention and/or detention facilities?
Yes No
Will you use permanent infiltration ponds or other low impact development (example: rain gardens, bio-
retention, porous pavement) to control flow during construction?
Yes No
2.1.4 Element 4: Install Sediment Controls
All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal BMP
before leaving the construction site or prior to being discharged to an infiltration facility. The specific
BMPs to be used for controlling sediment on this project include:
• Silt Fence (BMP C233)
• Storm Drain Inlet Protection (BMP C220)
• Temporary Sediment Trap (BMP C240)
Install Filter Fabric Fencing/Silt Fencing at locations shown and per the details and notes on the approved
Temporary Erosion and Sediment Control Plans.
In addition, sediment will be removed from paved areas in and adjacent to construction work areas
manually or using mechanical sweepers, as needed, to minimize tracking of sediments on vehicle tires
away from the site and to minimize washoff of sediments from adjacent streets in runoff.
Alternate sediment control BMPs are included in Appendix B as a quick reference tool for the onsite
inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during
construction to satisfy the requirements set forth in the General NPDES Permit (Appendix E). To avoid
potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction
Stormwater permit (as provided in Appendix E), the Certified Erosion and Sediment Control Lead will
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promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix B after the
first sign that existing BMPs are ineffective or failing.
2.1.5 Element 5: Stabilize Soils
Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent erosion
throughout the life of the project. The specific BMPs for soil stabilization that shall be used on this project
include:
• Temporary and Permanent Seeding (BMP C120)
• Mulching (BMP C121)
• Dust Control (BMP C140)
The project site is located west of the Cascade Mountain Crest. From October 1 through April 30, no soils
shall remain exposed and unworked for more than 2 days. From May 1 to September 30, no soils shall
remain exposed and unworked for more than 7 days. Soils shall be stabilized at the end of the shift before
a holiday or weekend if needed based on the weather forecast. These stabilization requirements apply to
all soils onsite, whether at final grade or not. The local permitting authority may adjust these time limits if it
can be shown that a development site’s erosion and runoff potential justifies a different standard.
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 the transportation of sediment
from the construction site to receiving waters will be prevented.
In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be temporarily
covered with plastic sheeting or seeded and mulched. All stockpiled soils shall be stabilized from erosion,
protected with sediment trapping measures, and where possible, be located away from storm drain inlets,
waterways, and drainage channels.
Alternate soil stabilization BMPs are included in Appendix B as a quick reference tool for the onsite
inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during
construction to satisfy the requirements set forth in the General NPDES Permit (Appendix E). To avoid
potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction
Stormwater permit (as provided in Appendix E), the Certified Erosion and Sediment Control Lead will
promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix B after the
first sign that existing BMPs are ineffective or failing.
West of the Cascade Mountains Crest
Season Dates Number of Days Soils Can be
Left Exposed
During the Dry Season May 1 – September 30 7 days
During the Wet Season October 1 – April 30 2 days
Anticipated project dates: Start date: April 2025 End date: April 2026
Will you construct during the wet season?
Yes No
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2.1.6 Element 6: Protect Slopes
All cut and fill slopes will be designed, constructed, and protected in a manner that minimizes erosion.
The following specific BMPs will be used to protect slopes for this project:
• Temporary and Permanent Seeding (BMP C120)
• Mulching (BMP C121)
All slopes where grading occurs or where vegetation has been removed shall be seeded per the notes
and details in the approved Temporary Erosion and Sediment Control Plans and in BMP C120. In no
case shall soils remain unworked and unstabilized for more than 7 days during the dry season (May 1 to
September 30) or more than 2 days during the wet season (October 1 to April 30).
Alternate slope protection BMPs are included in Appendix B as a quick reference tool for the onsite
inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during
construction to satisfy the requirements set forth in the General NPDES Permit (Appendix E). To avoid
potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction
Stormwater permit (as provided in Appendix E), the Certified Erosion and Sediment Control Lead will
promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix B after the
first sign that existing BMPs are ineffective or failing.
Will steep slopes be present at the site during construction?
Yes No
2.1.7 Element 7: Protect Drain Inlets
All storm drain inlets and culverts made operable during construction shall be protected to prevent
unfiltered or untreated water from entering the drainage conveyance system. However, the first priority is
to keep all access roads clean of sediment and keep street wash water separate from entering storm
drains until treatment can be provided. The following inlet protection measures will be applied on this
project:
• Storm Drain Inlet Protection (BMP C220)
o Drop Inlet Protection – Catch Basin Filters
Inlet protection is the last component of a treatment train and protection of drain inlets include additional
sediment and erosion control measures. Inlet protection devices will be cleaned (or removed and
replaced), when sediment has filled the device by one third (1/3) or as specified by the manufacturer.
Inlets will be inspected weekly at a minimum and daily during storm events.
Alternate inlet protection BMPs are included in Appendix B as a quick reference tool for the onsite
inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during
construction to satisfy the requirements set forth in the General NPDES Permit (Appendix E). To avoid
potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction
Stormwater permit (as provided in Appendix E), the Certified Erosion and Sediment Control Lead will
promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix B after the
first sign that existing BMPs are ineffective or failing.
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2.1.8 Element 8: Stabilize Channels and Outlets
Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent stream
banks, slopes, and downstream reaches, will be installed at the outlets of all conveyance systems.
Where site runoff is to be conveyed in channels or discharged to a stream or some other natural
discharge point, efforts will be taken to prevent downstream erosion. The specific BMPs for channel and
outlet stabilization that shall be used on this project include:
The project site is located west of the Cascade Mountain Crest. As such, all temporary on-site
conveyance channels shall be designed, constructed, and stabilized to prevent erosion from the expected
10-minute velocity of flow from a Type 1A, 10-year, 24-hour recurrence interval storm for the developed
condition. Alternatively, the 10-year, 1-hour peak flow rate indicated by an approved continuous runoff
simulation model, increased by a factor of 1.6, shall be used. Stabilization, including armoring material,
adequate to prevent erosion of outlets, adjacent streambanks, slopes, and downstream reaches shall be
provided at the outlets of all conveyance systems.
2.1.9 Element 9: Control Pollutants
All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and
disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and
preventative measures will be taken to ensure that the site will be kept clean, well-organized, and free of
debris. BMPs to be implemented to control specific sources of pollutants are discussed below.
Will maintenance, fueling, and/or repair of heavy equipment and vehicles occur on-site?
Yes No
Maintenance, fueling, and/or repair of heavy equipment and vehicles required to occur on-site shall follow
the requirements listed below. If the contractor chooses to store fueling tanks or petroleum product
storage containers onsite, they will amend this SWPPP to provide total volume of fuel stored onsite, the
capacity of the second containment for each tank, and provide a Spill Prevention, Control, and
Countermeasures (SPCC) Plan which complies with Federal regulations of the Clean Water Act (CWA).
Vehicles, construction equipment, and/or petroleum product storage/dispensing:
• All vehicles, equipment, and petroleum product storage/dispensing areas will be inspected
regularly to detect any leaks or spills, and to identify maintenance needs to prevent leaks or spills.
• On-site fueling tanks and petroleum product storage containers shall include secondary
containment.
• Spill prevention measures, such as drip pans, will be used when conducting maintenance and
repair of vehicles or equipment.
• In order to perform emergency repairs on-site, temporary plastic will be placed beneath and, if
raining, over the vehicle.
• Contaminated surfaces shall be cleaned immediately following any discharge or spill incident.
Will wheel wash or tire bath system BMPs be used during construction?
Yes No
Will pH-modifying sources be present on-site?
Yes No