HomeMy WebLinkAboutStormwater forms
Start HERE! A guide to using stormwater forms
Use the quantities reported in this worksheet to determine which minimum requirements apply to your project
and what forms will be required using the “Flow Chart for Determining Minimum Requirements.”
Step 1
Yes no
All projects must read and complete the Stormwater Calculation Worksheet.
Small Projects may submit the Worksheet S Small Project Certification sheet. Applicants who are able to sign the
certification may STOP HERE. Submit the Stormwater Calculation Worksheet and Worksheet “S” with your appli-
cation. No additional submittal is necessary.
Step 2
Step 2.1
Step 2.1 Medium Projects must complete worksheets A1, B1, and C or equivalent. Large Projects refer to Worksheet L to
determine applicable worksheets are required or if a state-licensed engineer must prepare the submittal.
A Note on Engineered Stormwater Submittal:
-Many applicants complete stormwater submittal forms independently without professional expertise. For example, full
dispersion, if feasible on the site (See Worksheet C), is typically easiest to implement for many different surface types such as
roof, driveway, patio etc.
-Applicants may opt to submit an engineered stormwater plan even if it isn’t required. This option may be attractive to those who
are unsure how some of the requirements will be achieved on the site.In some instances, engineering will be required. Certain
Large projects must be engineered (See Worksheet L). Gathering information on infiltration feasibility may need an engineer’s
expertise. Or, sites with greater than 15% slopes may require applicants hire a geologist to recommend if a drainage method is
appropriate. Discharging directly to a marine water via tightline must be engineered. If you cannot do full dispersion on parcels
larger than 5 acres, engineering is required. In other instances, site constraints will require an engineered design.
-Jefferson County staff may assist by providing and/or explaining Department of Ecology Stormwater Management Manual
The project requires or the applicant elects to submit an engineered stormwater plan. The plan is attached hereto
with minimum requirement narrative, drawings, calculation, modeling output, construction pollution prevention
plan, and site plan.
Circle one:
Step 3
If you answered YES above, STOP, no further submittal is required. Otherwise, proceed with the following steps.
Complete Worksheet A1 Medium/Large Project Report and Stormwater Site Plan or equivalent.
Step 3.1 Complete Worksheet C to determine which BMPs are possible and appropriate for your site. Circle the first BMP
that is feasible (i.e. none of the infeasibility criteria is checked) for each surface type. Circle the corresponding
BMP on Worksheet A1.
Step 4 Complete Worksheet B1 Medium/Large Project Construction Pollution Prevention Plan and Worksheet B2
Construction Site Plan or equivalent.
A Note on Commercial Projects:
• Jefferson County Public Works (JCPW) reviews commercial projects and charges a review fee. JCPW may charge additional
fees for any required inspections.
• Any commercial projects proposing infiltration facilities may complete Worksheet E—Infiltration Test. Grain size analysis may
be used instead of PIT. Commercial projects may elect to use BMP T5.10A and would not need a PIT, just a soil evaluation.
• Any development for cottage industries may require a commercial public works review if full dispersion is infeasible.
ZONS2023-00013
Olympic Discovery
Trail- Anderson Lake
Connection project
19 pages
stormwater calc worksheet QR code – REV. 5/31/2019 page 1 of 2
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street, Port Townsend, WA 98368
Tel: 360.379.4450 | Fax: 360.379.4451
Web: www.co.jefferson.wa.us/communitydevelopment
E-mail: dcd@co.jefferson.wa.us
STORMWATER CALCULATION WORKSHEET
PARCEL # PROJECT/APPLICANT NAME:
DETERMINING STORMWATER MANAGEMENT REQUIREMENTS: This stormwater calculation worksheet should be completed first to
classify the proposal as “small,” “medium,” or “large.” The size determines whether a Stormwater Site Plan is required in
conjunction with a stand-alone stormwater management permit application, building permit application, or other land use approval
application that involves stormwater review. The basic information will also be helpful for completing a Stormwater Site Plan, if
required.
Land-disturbing activity is any activity that results in movement of earth, or a change in the existing soil cover (both vegetative and
non-vegetative) and/or the existing soil topography. Land disturbing activities include, but are not limited to clearing, grading, filling,
excavation, and compaction associated with stabilization of structures and road construction.
Native vegetation is vegetation comprised of plant species, other than noxious weeds, which reasonably could have been expected
to naturally occur on the site. Examples include species such as Douglas fir, western hemlock, western red cedar, alder, big-leaf
maple, and vine maple; shrubs such as willow, elderberry, salmonberry, and salal; herbaceous plants such as sword fern, foam
flower, and fireweed.
LAND DISTURBING ACTIVITY, CONVERSION OF NATIVE VEGETATION, AND VOLUME OF CUT/FILL
Calculate the total area to be cleared, graded, filled, Answer the following two questions related to
excavated, and/or compacted for proposed development conversion of native vegetation:
project. Include in this calculation the area to be cleared for:
Does the project convert ¾ acres or more of
Construction site for structures _________________ sq/ft native vegetation to lawn or landscaped areas?
Drainfield, septic tank, etc. ____________________ sq/ft Circle: Yes No
Well, utilities, etc. ___________________________ sq/ft Does the project convert 2 ½ acres or more of
native vegetation to pasture?
Driveway, parking, roads, etc. ___________________sq/ft
Circle: Yes No
Lawn, landscaping, etc. ______________________ sq/ft
Other compacted surface, etc. _________________ sq/ft Indicate Total Volumes of Proposed:
(Includes BMP T5.13 Fill Volume)
Temporary construction area ______________ sq/ft
Total Land Disturbance ____________________ sq/ft Cut __________ Fill __________ (cu/yd)
PARCEL SIZE (I.E., SITE)
Size of parcel _________ acres An acre contains 43,560 square feet. Multiply the acreage by this figure.
Size of parcel in square feet _________________ sq/ft
Scan the QR
code to access
the digital form
ODT- Milo Curry Rd to Anderson Lake Park Jefferson County Public Works
42.35
approx.1,844,679
approx. 990,000
approx. 233,000
approx. 766,000
approx. 25,000 approx. 40,000
stormwater calc worksheet QR code – REV. 5/31/2019 page 2 of 2
~ Applicants for “small” projects must comply only with Minimum Requirement #2—Construction Stormwater Pollution Prevention.
Please submit the Small Project Certification (Worksheet “s). The proponent is responsible for employing the 12 Elements to control
erosion and prevent sediment and other pollutants from leaving the site during the construction phase of the project. Pick up the
Construction Stormwater Pollution Prevention (SWPPP) Best Management Practices (BMPs) Fact Sheet.
~ Applicants for “medium” projects—those that must meet only Minimum Requirements #1 through #5 must submit Worksheet A1
and B1, a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference A1A and B1A for
guidance).).
~ “Large” projects—those that must meet all 9 Minimum Requirements— must submit Worksheet A1 and B1, a stormwater site plan
and a construction stormwater pollution prevention site plan (See Reference A1A and B1A for guidance). Large projects also may
require engineering. See Worksheet L to determine additional large project requirements.
APPLICANT SIGNATURE By signing the Stormwater Calculation Worksheet, I as the applicant/owner attest that the information provided herein
is true and correct to the best of my knowledge. I also certify that this application is being made with the full knowledge and consent of all owners
of the affected property.
________________________________________ ________________________
(LANDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE) (DATE)
STORMWATER CALCULATIONS – IMPERVIOUS SURFACE
Impervious surface is a hard surface that either prevents or slows the entry of water into the soil as under natural
conditions prior to development. A hard surface area which causes water to run off the surface in greater
quantities or at an increased rate of flow from the flow present under natural conditions prior to development.
Common impervious surfaces include, but are not limited to roof tops, walkways, patios, driveways, parking lots
or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled, macadam or other
surfaces which similarly impede the natural infiltration of stormwater.
NEW EXISTING
Structures (all roof area) _________________sq/ft Structures (all roof area) _________________sq/ft
Sidewalks _________________sq/ft Sidewalks _________________sq/ft
Patios _________________sq/ft Patios _________________sq/ft
Solid Decks _________________sq/ft Solid Decks _________________sq/ft
(without infiltration below) (without infiltration below)
Driveway, parking, roads, etc _______________sq/ft Driveway, parking, roads, etc _______________sq/ft
Other _________________sq/ft Other _________________sq/ft
Total New _________________sq/ft Total Existing _________________sq/ft
TOTAL NEW + TOTAL EXISTING* _________________sq/ft *This amount will be used to check total lot coverage.
DEVELOPMENT v. REDEVELOPMENT
Divide the total existing
impervious surface above by the
size of the parcel and convert to
a percentage. ____________%
Does the site have > 35% or more
existing impervious surface?
The proposal is considered new development. Answer
questions in Figure 2.4.1 Flow Chart for New
Development to determine project size (next page).
The proposal is considered redevelopment Answer
questions in Figure 2.4.2. Flow Chart for
Redevelopment to determine project size (next page).
yes
no
approx. 233,000
approx. 83,000approx. 233,000
approx. 83,000
approx. 316,000
approx. 4.5
1-29-2024
This is a "large" project.
Large projects refer to
Worksheet L for submittal
requirements. At a
minimum, all large Project
must submit Worksheet
A1, B1, and C or
equivalent.
This is a "medium"
project. Submit
Worksheet A1,B1
and C or
equivalent.
Complete "Small" Project Certification Worksheet
Project must follow Construction Pollution Prevention Fact Sheet
Figure 2.4.1 Flow Chart for New Development
Worksheet L
Large Projects
Large Projects subject to Minimum Requirements #1
-9 must complete Worksheet A1 as applicable. Also
complete Worksheet B1.
No Further action needed.
Demonstrate full dispersion
on site plan.
Is the project on a parcel 5 acres or larger?
Yes
The proponent must submit
a stormwater report and site
plan prepared by a licensed
engineer that complies with
the 2012 Department of
Ecology Stormwater Man-
agement Manual for West-
ern Washington as amended
in 2014.
The report prepared by the
engineer must demonstrate
compliance with the LID
Performance Standard and
all minimum requirements.
no
For each surface consider
the BMPs in the order listed
in List #1 page 5 in
Worksheet A1, except,
raingardens may not be
used. This process is equiva-
lent to List #2 in the 2012
Department of Ecology
Stormwater Management
Manual for Western
Washington as amended in
2014.
Is the project in the Urban
Growth Area?
Yes
no
Does the project meet feasibility criteria
for full dispersion (see Worksheet C1)?
Yes
no
Yes no
Does the project discharge to a sub basin draining to salt water,
Dosewallips River, or Hoh River?
Use List #3 on Worksheet A1 page 6.
No further action is needed.
...per Otak plan.
construction Pollution Prevention Page 1 of 3 5/31/2019
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street, Port Townsend, WA 98368
Tel: 360.379.4450 | Fax: 360.379.4451
Web: www.co.jefferson.wa.us/communitydevelopment
E-mail: dcd@co.jefferson.wa.us
CONSTRUCTION STORMWATER POLLUTION PREVENTION
Best Management Practices (BMPs) Fact Sheet
For “small” projects (as determined through the Stormwater Calculation Worksheet), submit Worksheet
“S” Small Project Certification. Additionally, the applicant shall consider the twelve Construction
Stormwater Pollution Prevention elements and implement applicable BMPs. A set of useful BMPs for
typical rural residential construction is attached. There is no additional submittal required as part of the
permit application.
For “medium” and “large” projects, applicants must submit a Construction Stormwater Pollution
Prevention Plan (SWPPP) and a Stormwater Site Plan (applicants may use Worksheet B1 or equivalent).
The following twelve elements must be considered for Construction Stormwater Pollution Prevention
before and during the construction phase of the project:
1. Mark Clearing Limits 7. Protect Drain Inlets
2. Establish Construction Access 8. Stabilize Channels and Outlets
3. Control Flow Rates 9. Control Pollutants
4. Install Sediment Controls 10. Control De-Watering
5. Stabilize Soils 11. Maintain Best Management Practices
6. Protect Slopes 12. Manage The Project
Each of the twelve elements is described in more detail below:
1. Mark Clearing Limits
By minimizing the limits of clearing on the site, a builder can minimize stormwater runoff and provide
effective control of pollution.
2. Establish Construction Access
Much of the sediment that leaves a construction site does so on the wheels of delivery and construction
vehicles that drive off a project site. Construction access must be limited to a single location and a
properly constructed Stabilized Construction Entrance (BMP C105) should be included on the site.
3. Control Flow Rates
Stormwater that leaves a project site unimpeded may exceed the capacity of the existing stormwater
control facilities downstream and may contain sediment that may be deposited as the velocity of the
runoff decreases. Stormwater protection on a construction site should include measures to control the
flow rate of runoff from the site. This can be done by installing a Sediment Trap (BMP C240) or other
measure that will impede the flow of water off a construction site.
4. Install Sediment Controls
In addition to limiting the rate of stormwater flow off a construction site, measures should be put in place
to treat the runoff and remove sediment. Limiting of the cleared area (Element 1) will assist in this effort,
but there will be exposed soils that may move with the runoff. Suggested BMPs for controlling sediment
include Straw Wattles (BMPC235), Brush Barrier (BMP C231), Gravel Filter Berm (BMP C232), and Silt
Fence (BMP C233). Installation of a Sediment Trap (Element 3) is an additional sediment control feature.
construction Pollution Prevention Page 2 of 3 5/31/2019
5. Stabilize Soils
An additional measure that can minimize sediment transport in runoff is to stabilize soils on the site with
mulch or some other covering. This will limit the amount of soil that is exposed to rainfall, thus limiting the
sediment that could potentially leave the site. BMPs that could be used for this include Mulching (BMP
C121), Nets and Blankets (BMP C122), and Plastic Covering (BMP C123). During periods of dry weather
dust can become a problem and sediment could be transported from the site in high winds. BMP C140
Dust Control should be followed to limit loss of soils in windy conditions.
6. Protect Slopes
If the cleared area includes slopes of 3:1 (Horizontal: Vertical) or steeper, the slopes should be protected
to limit runoff. If the slopes are not protected, rills and gullies may form, transporting sediment to the
lower elevations and potentially off the construction site. The slopes should be graded to minimize
erosion and runoff at the downstream end of the slopes, and runoff should be collected and treated. The
following BMPs could be used Surface Roughening (BMP C130), Interceptor Dike and Swale (BMP
C200), and Pipe Slope Drains (BMP C204).
7. Protect Drain Inlets
Runoff from urban construction sites often discharges into existing stormwater collection systems. Water
enters the collection system through drain inlets. If there are drain inlets downstream of a construction
site, they should be protected using BMP C220 Storm Drain Inlet Protection.
8. Stabilize Channels and Outlets
Any temporary on-site channels or ditches that are used to control runoff should be stabilized to prevent
erosion in the channel. BMP C202 Channel Lining and BMP C209 Outlet Protection should be used.
9. Control Pollutants
The best way to control pollution is to limit the source of pollution. Construction debris should be
maintained in a safe location. Vehicle maintenance on the construction site should be minimized and any
spill should be promptly cleaned up. Concrete spillage should be kept to a minimum and cleaning of the
concrete trucks after they have unloaded should be done in an area that will not drain off site (see BMP
C151 Concrete Handling).
10. Control Dewatering
In some cases, excavation for the foundation or below ground structures will encounter ground water.
This water must be removed (dewatered) from the excavation. Discharge of this ground water must be
treated in a manner that will not cause damage downstream due to flow rates or added pollution. There
are no specific BMP identified for this activity, but the water should be handled with care to assure that
soils or other pollutants are not added to this flow.
11. Maintain BMPs
Installation of the appropriate BMPs is not adequate to completely control stormwater runoff. The BMPs
that have been installed on the project must be inspected and maintained during the duration of the
construction project. In addition, the temporary controls that were installed for construction should be
removed within 30 days of completion of the work. Typically, once construction has been completed, the
temporary facilities are not maintained, and by removing the facilities, it will ensure that these won’t fail
and discharge water or sediment that had been previously trapped or contained.
12. Manage the Project
Management of a project has four aspects:
1. Phasing construction to prevent transportation of runoff and sediment,
2. Limiting the work during seasons where large amounts of rainfall could be anticipated,
3. Coordination with Utilities and other Contractors, and
4. Inspection and Monitoring.
All of these for aspects are important and must be followed to ensure a project that will have minimal
impact on the environment. Volume II of the Manual contains additional BMPs that could be used on-site.
The applicant is encouraged to review the Manual to see if other BMPs may be applicable to, or more
useful on, a particular site.
construction Pollution Prevention Page 3 of 3 5/31/2019
Best Management Practices from 2014 Ecology Stormwater
Management Manual
The following BMPs for Construction Stormwater Pollution Prevention are
sediment and erosion control measures for the construction phase of typical
rural residential development. Some projects may not require implementation of
all of these BMPs; others may require additional measures not listed here.
Click on the BMP to learn more about each BMP’s purpose and design:
II-4.1 Source Control BMPs
BMP C101: Preserving Natural Vegetation
BMP C102: Buffer Zones
BMP C103: High Visibility Fence
BMP C105: Stabilized Construction Entrance /
Exit
BMP C106: Wheel Wash
BMP C107: Construction Road/Parking Area
Stabilization
BMP C120: Temporary and Permanent Seeding
BMP C121: Mulching
BMP C122: Nets and Blankets
BMP C123: Plastic Covering
BMP C124: Sodding
BMP C125: Topsoiling / Composting
BMP C126: Polyacrylamide (PAM) for Soil
Erosion Protection
BMP C130: Surface Roughening
BMP C131: Gradient Terraces
BMP C140: Dust Control
BMP C150: Materials on Hand
BMP C151: 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 Sediment
Control Lead
BMP C162: Scheduling
II-4.2 Runoff Conveyance and Treatment BMPs
BMP C200: Interceptor Dike and Swale
BMP C201: Grass-Lined Channels
BMP C202: Channel Lining
BMP C203: Water Bars
BMP C204: Pipe Slope Drains
BMP C205: Subsurface Drains
BMP C206: Level Spreader
BMP C207: Check Dams
BMP C208: Triangular Silt Dike (TSD)
(Geotextile-Encased Check Dam)
BMP C209: Outlet Protection
BMP C220: Storm Drain Inlet Protection
BMP C231: Brush Barrier
BMP C232: Gravel Filter Berm
BMP C233: Silt Fence
BMP C234: Vegetated Strip
BMP C235: Wattles
BMP C236: Vegetative Filtration
BMP C240: Sediment Trap
BMP C241: Temporary Sediment Pond
BMP C251: Construction Stormwater Filtration
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X indicates BMPs chosen for this project
Worksheet A1
Medium & Large Project Report
Submit a site plan demonstrating the project. Refer to REFERENCE A1A for examples of Best Management
Practices (BMP’s) that you can use. Remember that all site plans submitted for the project must be consistent
and accurate.
page 1 of 6
Minimum Requirement # 1 : Preparation of Stormwater Site Plan
Describe both existing and proposed site conditions for the following items as applicable in the space below each
bullet point. Attach additional pages if needed. • structures
•
• roads
•
• utility locations•
• wellhead locations
•
• septic drainfield locations and type
• • stormwater run-on from neighboring properties
•
• expected excavation depths and volumes
•
• expected work to be done in Right-of-Way (ROW)
Complete the following:
Minimum Requirement # 2 : Construction Stormwater Pollution Prevention Plan (SWPPP)
A SWPPP is designed to be a stand-alone document that addresses construction stormwater management concerns. This
document is required to be kept by the contractor performing the work at the jobsite for reference and update during
the life of the project. Construction BMP’s must be indicated on the stormwater site plan. REFERENCE B1A includes
diagrams of common BMP’s that may be used on the site plan.
My completed SWPPP (WORKSHEET B1 or equivalent) is included in this application packet!
Minimum Requirement # 3 : Source Control of Pollution (not construction related)
The intent of source control is to prevent stormwater from coming in contact with pollutants. Source control BMPs
can be operational or structural in nature. A roof over a material storage area is an example of a structural source
control BMP. Washing your vehicle on the lawn rather than in the street is an operational BMP. This requirement
is generally not applicable to Single Family Residences (SFRs); however, ways to minimize pollution from moving
downstream should be considered during the design phase of every project. Specifications on standard source control
BMPs that are applicable to various commercial and industrial-type facilities can be found in Volume IV of the 2014
Stormwater Management Manual for Western Washington (SWMMWW) (continued on page 2).
X
X
None
Crossing 3 existing roads. Proposing short lengths of new gravel service road for utility access.
Existing OH & UG electrical, phone, & fiberoptic; water transmission and service pipes. None proposed.
None
None
See Otak report
Proposed up to 15l deep cuts, approx. 25,000 CY cut, 40,000 CY fill.
Proposed construction of trail, stormwater infiltration trenches, striping, signs, and road approaches.
Worksheet A1
Medium & Large Project Report
page 2 of 6
Check one of the following boxes that best represents your project with regards to MR #3.
Minimum Requirement # 3 : Source Control of Pollution (continued from page 1)
My project is a Single Family Residence (SFR) and after considering operational and structural measures to prevent
stormwater from coming in contact with pollutants, I have:
determined this MR to not be applicable. made appropriate adjustments to my project.
My project is not a SFR and after reviewing Vol. IV of the SWMMWW, I have determined that this MR is not applicable because of the following reason:
My project is not a SFR and after reviewing Vol. IV of the SWMMWW, I have determined that the following source control BMPs are applicable to my project and shall be incorporated into the project design and operation.X
See page 2 before this page for highlighted BMPs
Worksheet A1
Medium & Large Project Report
Minimum Requirement # 4 : Preservation of Natural Drainage Systems
Creating new drainage patterns results in more site disturbance and more potential for erosion and sedimentation during
and after construction. to the maximum extent possible, proponents must 1) maintain the natural on-site drainage
pattern and concentrated discharge location at the downstream property boundary, and 2) prevent erosion at and
downstream of the discharge location.
NOTE: All outfalls require energy dissipation. See Table 4.5.1 in Vol. V of the SWMMWW for minimum design standards
for rock protection at outfalls.
Choose the option below that best describes your project:
page 3 of 6
The project site does not currently have any intermittent, seasonal, or continuous concentrated water
moving across any part of the property and the proposed improvements to the site will not create new
concentrated flow paths or not discharging to existing drainage systems.
The project site has existing concentrated flow drainage systems and outfalls. (NOTE: These items must be graphically shown on the Site Plan or equivalent, to include: type, slope, dimensions, channel lining,
direction of flow, buffer, etc.) Select below how it will be addressed.
This project will not alter the existing drainage system in any way. If the existing outfall(s) show
signs of erosion and scour, energy dissipation measures will be installed or improved upon.
Construction activity of any kind will not occur within at least 10 ft. of the edge of the channelized flow. BMP C102: BUFFER ZONES will be implemented during the life of the project to include visible
flagging or other demarcation technique.
The existing concentrated drainage system traversing the property will be impacted as part
of this project, as described in the space below and shown on the site plans. Engineering
calculations are required that show the altered drainage design can accommodate the existing flows and the added runoff contributed by the project.
X
X
Worksheet A1
Medium & Large Project Report
page 4 of 6
My project is a large project. Refer to Worksheet L. If full dispersion isn’t feasible, use LIST #1
(List #2 and List #1 are the same except raingardens are not permitted in List #2).
Minimum Requirement # 5 : On-site Stormwater Management
On-site stormwater management techniques shall be implemented where possible to accommodate the permanently
added stormwater runoff being generated by development. Some on-site stormwater management techniques provide
better stormwater detention and treatment than others; however, they are not always appropriate for use due to varying
individual site characteristics. Therefore, techniques are presented to applicants on the next pages in a hierarchical order
and shall be considered for use in the order listed. The first technique on the list that is determined to be possible shall
be implemented. See WORKSHEET C to determine which techniques are feasible.
Runoff from developments occurring in drainage basins that drain directly or indirectly to a creek require a higher level
of stormwater management, thus, the techniques are presented in three lists below:
All properties will be in one of these three categories:
My project is located in a drainage subbasin that
drains to directly or indirectly to freshwater.
PROCEED to Page 5 to use LIST #1.
My Project will discharge to a subasin draining to
salt water, Dosewallips River, or Hoh River.
PROCEED to Page 6 to use LIST #3.
X
Worksheet A1
Medium & Large Project Report
My project does not have disturbed soils not covered by impervious surfaces.
1. Post-Construction Soil Quality and Depth
Disturbed soils shall be amended (BMP T5.13: ).
My project does not have Roof areas.
1. Full Dispersion (BMP T5.30)
OR Downspout Full Infiltration (BMP T5.10A) 2. Rain Garden (LARGE PROJECTS CANNOT USE)
(BMP T5.14A)
3. Downspout Dispersion System (BMP T5.10B)
4. Perforated Stub-Out Connection (BMP T5.10)
5. Each BMP above is infeasible, see WORKSHEET C. STOP.
COMPLETE AND SUBMIT WORKSHEET B1. NO OTHER
INFORMATION REQUIRED AT THIS TIME.
My project does not have Other Hard Surface areas
1. Full dispersion (BMP T5.30)
2. Permeable Pavement (BMP T5.15) OR Rain Garden (LARGE PROJECTS CANNOT USE) (BMP T5.14A)
Minimum Requirement # 5 : On-site Stormwater Management (continued)
LIST # 1 : Applicable to projects that directly or indirectly drain to freshwater.
INSTRUCTIONS: Check the first option that will work for Each Category Below:
For each category below, proceed through the LIST from top down. Use WORKSHEET C to determine if the BMP
can be used. If number 1 on the list is not possible, document why on WORKSHEET C and move down to number 2, and so on.
Category A: Lawn and Landscape Areas
Category B: Roofs
Category C: Other Hard Surfaces, e.g. gravel and paved
driveways, solid decks and patios without infiltration below
3. Sheet Flow Dispersion (BMP T5.12) OR Concentrated Flow Dispersion (BMP T5.11)4. Each item above is infeasible, see WORKSHEET C. STOP.
COMPLETE AND SUBMIT WORKSHEET B1. NO OTHER
INFORMATION REQUIRED AT THIS TIME.
X
X
X
X
Worksheet B1
Construction Protection: Medium and Large Projects(SWPPP: Stormwater Pollution Prevention Plan)
Submit a site plan demonstrating the construction protective measures or best management practices that will be used for the project during the construction phase.
Refer to REFERENCE B1A for examples of Construction Best Management Practices (BMP’s) that you can use. The
activities that take place during construction are the highest risk for stormwater problems such as erosion and
sediment control (you may need to provide an additional site plan with greater detail for stormwater features. If so, make sure it is consistent with the primary site plan. Remember that all site plans submitted for the project must
be consistent and accurate).
page 1 of 6
Element 1: Preserve Vegetation / Mark Clearing Limits
The goal of this element is to preserve native vegetation and to clearly show the limits of disturbance.
Choose any of the following that apply:
The site was cleared as part of clearing activity that is subject to an enforcement action and will be re-vegetated.
Restoration may be necessary to comply with Critical Area Regulations or stormwater requirements. Buffer Zones-
BMP C102 may apply if Critical Areas exist on-site and buffer zones shall be protected.
The perimeter of the area to be cleared shall be marked prior to clearing operation with visible flagging, orange plastic barrier fencing and/or orange silt fencing as shown on the SWPPP site plan. Vehicles will only be allowed
in the areas to be graded, so no compaction of the undeveloped areas will occur. If this option is selected check
the BMPS you will use below:
C101 Preserving Natural
Vegetation
C102 Buffer
Zones
C103 High Visibility
Fence
It is necessary to disturb the entire property during this project due to existing site conditions, property
constraints, and proposed design. I understand that all disturbed land not covered by hard surface at the end of
the project is subject to soil amendment requirements per BMP T5.13 Post-Construction Soil Quality and Depth.
Element 2: Construction Access
The goal of this element is to provide a stabilized construction entrance/exit to prevent or reduce or sediment track out.
Choose one of the following:
The driveway to the construction area already exists and will be used for construction access. All equipment and
vehicles will be restricted to staying on that existing impervious surface. If sediment is tracked off site, the road-
way will be cleaned thoroughly at the end of each day.
A stabilized construction entrance will be installed prior to any vehicles entering the site, at the location
shown on the SWPPP site plan. If sediment is tracked off site, the roadway will be cleaned thoroughly at the end of each day. If this option is selected check the BMPS you will use below:
C105 Stabilized
Construction Entrance /
Exit
C106 Wheel
Wash
C107 Construction
Road / Parking Area
Stabilization
X
X
X X X
X
X
Worksheet B1
Construction Protection: Medium and Large Projects(SWPPP: Stormwater Pollution Prevention Plan)
Element 3: Control Flow Rates
The goal of this element is to construct retention or detention facilities when necessary to protect properties and waterways downstream of development sites from erosion and turbid discharges.
This element does not apply to my project because (check any that apply):
page 2 of 6
Site is mildly sloped (<5%),
There are no individually sloped sections greater than 10%,
The bulk of the project is scheduled to occur during dry season (May 1-Sept 30)
Sediment control BMPs shall be placed at the locations shown on the SWPPP Site Plan. If this option is selected
check the BMPS you will use below:
C233 Silt FenceC231 Brush Barrier
C234 Vegetated
Strip
C232 Gravel Filter
Berm
C235 Wattles
Element 4: Sediment Control
The goal of this element is to construct sediment control BMPs that minimize sediment discharges from the site.
Select one of the two statements applicable to the project.
The site has already been stabilized and re-vegetated.
Element 5: Stabilize Soils
• Soil stockpiles will be located within the disturbed area shown on the SWPPP Site Plan.
• Soil excavated for the foundation will be backfilled against the foundation and graded to drain away from the building. • No soils shall remain exposed and unworked for more than 7 days from May 1 to September 30 or more than
2 days from October 1 to April 30. • Once the disturbed landscape areas are graded, the grass areas will be amended.
• All stockpiles will be covered with plastic or burlap if left unworked.
The goal of this element is to stabilize exposed and unworked soils by implementing erosion control BMPs.
Select one of the three statements applicable to the project.
My project will ensure the following:
This element does not apply to my project because:
My project must implement specific BMP’s to ensure compliance. (Check BMP’s you will use on the next page).
X
X X
X
X
Worksheet B1
Construction Protection: Medium and Large Projects(SWPPP: Stormwater Pollution Prevention Plan)
page 3 of 6
C120 Temporary &
Permanent Seeding
C123 Plastic CoveringC121 Mulching
C124 SoddingC122 Nets & Blankets
C125 Topsoil /
Composting
C131 Gradient
Terraces
C140 Dust Control
C235 Wattles
Element 6: Protect Slopes
The goal of this element is to design and construct cut-and-fill slopes in a manner to minimize erosion.
Select one of the two statements applicable to the project.
No cut slopes over 4 feet high or slopes steeper than 2 feet horizontal to 1 foot vertical, and no fill slopes over
4 feet high will exceed 3 feet horizontal to 1 foot vertical. Therefore, there is no requirement for additional
engineered slope protection.
The above checkbox is not checked. My submittal is designed by a licensed geologist to protect slopes. Based on
the licensed professionals recommendation (please attach their evaluation), the following BMP’s will be used:
C120 Temporary & Permanent
Seeding
C204 Pipe Slope Drains
C205 Subsurface
Drains
C206 Level Spreader
C207 Check Dams
C208 Triangular Silt Dike
(Geotextile-Encased Check Dam)
Catch basins on the site or immediately off site in the right-of-way are shown on the SWPPP Site Plan. Storm drain
inlet protection shall be installed. If this option is selected check the BMPS you will use below:
C220 Storm Drain Inlet Protection
The site has open ditches in the right-of-way or private road right-of-way.
There are no catch basins on or near the site.
Element 7: Protect Permanent Drain Inlets
The goal of this element is to protect storm drain inlets during construction to prevent stormwater runoff from entering the conveyance system without being filtered or treated.
Select one of the three statements applicable to the project.
X
X X
X C126 PAM
X C121 Mulching X C122 Nets & Blankets X C130 Surface Roughening X C235 Wattles
X
X
X
Worksheet B1
Construction Protection: Medium and Large Projects(SWPPP: Stormwater Pollution Prevention Plan)
A wattle shall be placed at the end of the swale to prevent erosion at the outlet of the swale. If this option is
selected check the BMPS you will use below:
C202 Channel Lining C207 Check Dams C235 WattlesC209 Outlet Protection
page 4 of 6
Element 8: Stabilize Channels and Outlets
The goal of this element is to design, construct, and stabilize on-site conveyance channels to prevent erosion from entering existing stormwater outfalls and conveyance systems.
Select one of the three statements applicable to the project.
Construction will occur during the dry weather. No storm drainage channels or ditches shall be constructed either
temporary or permanent.
There are no existing or proposed stormwater conveyance channels on the project site.
C151 Concrete Handling C152 Sawcutting and Surfacing
Pollution Prevention
C153 Material Delivery, Storage, and Containment C154 Concrete Washout Area
If one or more of the checkboxes above are unchecked. Any and all pollutants, chemicals, liquid products and other
materials that have the potential to pose a threat to human health or the environment will be covered, contained, and
protected from vandalism. All such products shall be kept under cover in a secure location on-site. Concrete handling
shall follow BMP C151 C154. If this option is selected check the BMPS you will use below:
Element 9: Control Pollutants
This element does not apply to my project because (circle any that apply - If any box is unchecked this element applies.
The goal of this element is to design, install, implement and maintain BMPs to minimize the discharge of pollutants from material storage areas, fuel handling, equipment cleaning, management of waste materials, etc.
There will be no concrete work,
There will be no sawcutting work,
There will be no hazardous materials on-site,
There will be no fertilizer or pesticide application,
There will be no heavy equipment associated with this project,
There will be no pressure washing, equipment maintenance or dewatering
X C122 Nets & BlanketsX
X X X
X
X
X
Worksheet B1
Construction Protection: Medium and Large Projects(SWPPP: Stormwater Pollution Prevention Plan)
C203 Water Bars C236 Vegetated Filtration C206 Level Spreader
Element 10: Control De-watering
No dewatering of the site is anticipated.
Dewatering of the site is anticipated. If this option is selected check the BMPS you will use below:
page 5 of 6
Select one of the two statements applicable to the project.
The goal of this element is to handle turbid or contaminated water from dewatering (removal of water)
separately from stormwater.
Describe the steps you will take:
Element 12: Manage the Project
The SWPPP will be implemented at all times. If applicable to the project, erosion control BMPs will be implemented in the following sequence:
1. Mark clearing limits
2. Install stabilized construction entrance
3. Install protection for existing drainage systems and permanent drain inlets
4. Establish staging areas for storage and handling polluted material and BMPs
5. Install sediment control BMPs
6. Grade and install stabilization measures for disturbed areas
7. Maintain BMPs until site stabilization, at which time they may be removed
Element 11: Maintain Best Management Practices
Best Management Practices or BMPs shall be inspected and maintained during construction and removed within
30 days after the County Inspector or determines that the site is stabilized, provided that they may be removed when they are no longer needed.
The goal of this element is to maintain and repair all temporary and permanent erosion and sediment control BMPs to assure continued performance.
The goal of this element is to ensure that the owner and those performing the site work comply with the SWPPP and properly coordinate to ensure that all BMPs are deployed at the proper time to achieve full compliance with county regulations throughout the project.
X
X
X C150 Materials on Hand X C160 CESCL
X C160 CESCL X C162 Scheduling
Worksheet B1
Construction Protection: Medium and Large Projects(SWPPP: Stormwater Pollution Prevention Plan)
C102 Buffer Zone C103 High Visibility Fence
C233 Silt Fence
C231 Brush Barrier
C234 Vegetated Strip
Applicant or Representative Signature
Element 13: Protect Low Impact Development BMPs
page 6 of 6
The goal of this element is to protect permanent stormwater management BMPs from siltation and compaction during construction. The permanent stormwater management BMPs used for runoff from roofs and other hard surfaces include: full dispersion, roof downspout full infiltration or dispersion systems, perforated stubout connections, rain gardens, bioretention systems, permeable pavement, sheetflow dispersion, and concentrated flow dispersion.
Methods that will be used to protect permanent stormwater management BMPs include:
Sequencing the construction in a fashion to install these permanent BMPs at the latter part of the construction grading operations,
Excluding equipment from the BMPs and the associated areas,
Using the erosion and sedimentation control BMPs listed below to protect facilities such as drywells, raingardens, permeable pavement, or bioretention from accumulating sediment during construction and before site restoration. If this option is selected check the BMPS you will use below:
Other
X
X
X
X
X
X