HomeMy Public PortalAboutCity of Webster GrovesBILL # 8591
ORDINANCE # 8591
AN ORDINANCE AMENDING THE CODE OF WEBSTER GROVES BY
ADDING CHAPTER 20"BUILDING CODE," ARTICLE III. LAND
DISTURBANCE CODE WHICH INCLUDES "MODEL BEST MANAGEMENT
PRACTICES (BMP) FOR LAND DISTURBANCE — SEDIMENT
AND EROSION CONTROL"
WHEREAS, the Council of the City of Webster Groves has determined that the
City may best safeguard persons, protect property, and prevent damage to the
environment in the City of Webster Groves by guiding, regulating, and controlling the
design, construction, use, and maintenance of any development or other activity that
disturbs or breaks the topsoil or results in the movement of earth on land in the City of
Webster Groves, Missouri.
WHEREAS, the Council of the City of Webster Groves has determined that the
document attached hereto as "Exhibit A" and entitled "Model Best Management
Practices (BMP) for Land Disturbance — Sediment and Erosion Control" complies with
the requirement that the City of Webster Groves, as co-permittee, prepare a Storm Water
Management Plan that outlines methods of compliance with the regulatory requirements
of the Phase II Storm Water Permit.
NOW, THEREFORE, BE IT ORDAINED BY THE COUNCIL OF THE CITY OF
WEBSTER GROVES, MISSOURI, AS FOLLOWS:
Section 1: That Exhibit A, a copy of which is on file in the office of the Building
Commissioner of the City of Webster Groves being marked and designated as "The Land
Disturbance Code" which includes "Model Best Management Practices (BMP) for Land
Disturbance — Sediment and Erosion Control is hereby adopted as the Land Disturbance
Code of the City of Webster Groves in the State of Missouri; for the control of sediment
and erosion as herein provided; and each and all of the regulations, provisions, penalties
conditions and terms of said Land Disturbance Code and Model Best Management
Practices (BMP) for Land Disturbance — Sediment and Erosion Control" are hereby
referred to, adopted and made a part hereof as if fully set out in this ordinance, with the
additions, insertions, deletions and changes set forth in "Exhibit A" pursuant to Section 2
of this ordinance.
Section 2: The Code of the City of Webster Groves is hereby amended by enacting the
new Chapter 20, Article III, entitled "The Land Disturbance Code" which includes
"Model Best Management Practices (BMP) for Land Disturbance — Sediment and
Erosion Control" attached hereto as Exhibit A and incorporated herein by reference.
Section 3: This ordinance shall be printed in the Code of Webster Groves.
Section 4: Al! ordinances or parts of ordinances in conflict herewith are hereby repealed.
Section 5: This ordinance shall take effect and be in force from and after its passage and
approval as provided by law.
PASSED AND APPROVED this 11 day of
MAYOR
ATTES"l
TABLE OF CONTENTS
Page Title
1 20.0010B Administration
1 101.0 SCOPE
101.2 Introduction
101.3 Purpose and Scope
1 102.0 APPLICABILITY
102.1 Other Laws
1 103.0 ENFORCEMENT
103.1 Department of Planning and Development
103.2 Permits
103.3 Rule -making Authority
103.4 Administration and Enforcement
103.5 Plan Review
2 104.0 VIOLATIONS
104.1 Unlawful Acts
104.2 Notices of Violation
104.3 Prosecution of Violation
104.4 Violation, Penalties
104.4.1 No -permit Penalty
104.5 Abatement of Violation
104.6 Permit Suspension or Revocation
104.7 Stop Work Order
104.7.1 Unlawful Continuance
3 105.0 APPEALS
105.1 Application for Appeal
105.2 Basis for Appeal
4 106.0 LAND DISTURBANCE PERMITS REQUIRED
106.1 City Permit Required
106.1.1 Application
106.1.2 City Building Permit and Related Ordinary Land Disturbance Activities
106.2 Limitation on Transfer of Land Disturbance Permits
106.3 Land Disturbance Permit Exceptions
106.3.1 Minor Grading
106.3.2 Public Entities
106.3.3 Emergencies
106.4 State of Missouri Permits Required
5 107.0 LAND DISTURBANCE PERMIT APPLICATIONS
107.1 Permit Applications
107.2 Storm Water Pollution Plan (SWPPP) Required for Major Land Disturbance Permits
107.3 Required Site Development Escrows for Major Land Disturbance Permits
107.3.1 Release of Escrows - Project Closure
107.3.2 Use of Escrows by City
107.4 Submittal Requirements for Ordinary Land Disturbance Permits
6 108.0 FEES
108.1 Issuance of Permits
108.1.1 Department of Planning and Development
108.1.2 Department of Public Works
7 109.0 INSPECTIONS
109.1 Typical Inspection Requirements
109.2 Extra Inspections
109.3 Pre -land Disturbance Inspection
109.4 Permit Holder Inspection and Report Responsibilities for Major Land Disturbance Activities
7 20.0020B Definitions
7 201.0 DEFINITIONS
10 20.0030B Design requirements
10 301.0 GENERAL
301.1 Design Guidelines
301.2 State Operating Permit from the Missouri Department of Natural Resources (DNR)
301.3 Tree Preservation Permit from the Department of Planning and Development
301.4 Requirements of Permit Holder
301.5 Submission Requirements of the Department of Planning and Development
301.6 Issuance of Permit
11 302.0 STORM WATER POLLUTION PREVENTION PLANS (SWPPP)
302.1 General
302.2 Storm Water Pollution Prevention Plan (SWPPP) Contents
302.3 Simplified Storm Water Pollution Prevention Plan (SWPPP)
302.3.1 Simplified Storm Water Pollution Prevention Plan (SWPPP) Contents
302.3.2 Additional Contents
302.4 Storm Water Pollution Prevention Plan (SWPPP) for Clearing and Grubbing
302.5 Permit Requirements for Test Holes
302.6 Amending the Stormwater Pollution Prevention Plan (SWPPP)
15 303.0 PERFORMANCE STANDARDS
303.1 Design of Erosion and Sediment Controls
303.1.1 Erosion Control Requirements
303.1.2 Sediment Control Requirements
303.2 Water Course Protection Requirements
303.3 Construction Site Access Requirements
303.4 Control Requirements for Construction Materials
17 304.0 SKETCH PLAN REQUIREMENTS FOR MAJOR LAND DISTURBANCE PERMIT
304.1 Purpose
304.2 Sketch Plan Contentss
EROSION CONTR
Al Bonded Fiber Matrix
A2 Dust Control
A4 Erosion Control Blankets
A6 Mulching
A7 Mulch Selection as a Function of Slope (Chart)
A7 General Mulch Recommendations to Protect from Splash and Sheet Flow (Chart)
A8 Rock Outlet
A9 Seeding
All Seeding Requirements (Chart)
Al2 Sodding
A14 Soil Binders
A15 Stream Bank Protection
A17 Temporary Stream Crossing
VIEW POLLUTION PREVENTION
A18 Non -Sediment Pollution Control
A21 Pollution Prevention Procedures
RUNOFF MANAGEMENT
A22 Check Dam
A23 Diversion - Ridge & Channel
A25 Diversion - Storm Sewer
A26 Gradient Terraces
A27 Grass Lined Channel
A29 Gravel Bags
A30 Level Spreader
A31 Surface Roughening
A32 Temporary Slope Drain
Mir SEDIMENT CAPTURE
A34 Filter Strip
A36 Inlet Protection - Block & Gravel
A37 Inlet Protection - Fabric Drop
A38 Inlet Protection - Sod Filter
A39 Sediment Basin
A41 Sediment Trap
A43 Silt Fence
WiliTcoNTRoL
A45 Construction Entrance
A46 Construction Road
A47 Wash down Station
lingff STANDARD DRAWINGS
EC -5 Rock Outlet
EC -7 Sodding
EC -10 Temporary Stream Crossing
RM-1 Check Dam
RM-2 Temporary Diversions - Ridge & Channel
RM-4 Gradient Terraces
RM-5 Grassed Lined Channel
RM-6 Gravel Bags
RM-7a Level Spreader
RM-7b Level Spreader
RM-8 Surface Roughening
RM-9 Temporary Slope Drain
SC -1 Filter Strip
SC -2 Inlet Protection - Block & Gravel
SC -3 Inlet Protection - Fabric Drop
SC -5 Inlet Protection - Sod Filter
SC -6 Sediment Basin
SC7a Sediment Trap
SC -8b Sediment Trap - Single Chamber
SC -7c Sediment Trap - Double Chamber
SC -8 Silt Fence
TC-1 Construction Entrance
TC-3 Construction Road
TC-4 Wash down Station
LAND DISTURBANCE CODE
SECTION 20.001011 ADMINISTRATION.
SECTION 101.0 SCOPE
101.1 Title: These regulations shall be known as the "Land Disturbance Code" of Webster Groves,
Missouri, hereinafter referred to as "this Code."
101.2 Introduction: On Construction or Land Disturbance Sites, soil is highly vulnerable to erosion by
wind and water. Eroded soil endangers water resources by reducing water quality and causing the siltation
of aquatic habitat for fish and other desirable species. Deposits of eroded soil also necessitate
maintenance of sewers and ditches and the dredging of lakes. In addition, clearing and grading during
construction cause the loss of native vegetation necessary for terrestrial and aquatic habitat. Construction
activities also utilize materials and generate wastes, which if not properly controlled can pollute receiving
waters.
101.3 Purpose and scope: The purpose of this Article is to safeguard persons, protect property, and
prevent damage to the environment in the City of Webster Groves. This Article will also promote the
public welfare by guiding, regulating, and controlling the design, construction, use, and maintenance of
any development or other activity that disturbs or breaks the topsoil or results in the movement of earth on
land in the City of Webster Groves.
SECTION 102.0 APPLICABILITY
102.1 Other Laws: The provisions of this Article shall not be deemed to nullify any provisions of City,
state or federal law. When a conflict occurs between this code and any other legally adopted provision,
the most stringent shall apply.
SECTION 103.0 ENFORCEMENT
103.1 Department of Planning and Development: The Department of Planning and Development shall
have the authority and responsibility to perform the following functions related to the enforcement of this
Article as associated with Major Land Disturbance Permits:
1. Receive applications for Land Disturbance Permits;
2. Plan review of Land Disturbance Activities;
3. Coordinate the review of Land Disturbance permit applications and accompanying documents
with the Department of Public Works;
4. Administer the determination, collection and release of site development escrows required by this
Article in coordination with the Departments of Finance;
5. Inspect Land Disturbance Activities;
6. Inspect Land Disturbance Activities within or abutting areas designated as one -hundred -year
flood plains; and
7. Coordinate the inspection of Land Disturbance Activities with the Department of Public Works
when Land Disturbance Activities are in areas under the jurisdiction of the Department of Public
Works including, but not limited to, rights -of -way and easements.
LDC/BMP 1
103.2 Permits: No Major Land Disturbance Permit or Ordinary Land Disturbance Permit shall be issued
where the Department of Planning and Development finds that the proposed land disturbance activity
would result in a material change in the amount or pattern of surface water run-off to the substantial
injury of neighboring public or private property or right-of-way.
All land disturbance activities shall be carried out in such a manner as to minimize inconvenience and
harm to adjacent properties and property owners.
103.3 Rule -making authority: The Department of Planning and Development shall have the authority,
as necessary in the interest of public health, safety and general welfare, to adopt and promulgate rules and
regulations to interpret and implement the provisions of this Article, in order to secure the intent thereof,
and to designate requirements applicable because of local climatic or other conditions. Such rules and
regulations shall not have the effect of waiving requirements specifically provided for in this Article or of
violating accepted engineering practices involving the purpose of this Article.
103.4 Administration and enforcement: The Department of Planning and Development may delegate
responsibility for the administration and enforcement of the provisions of this Code to other agencies
including but not limited to the Department of Public Works of the City of Webster Groves, the
Department of Finance of the City of Webster Groves, and the Department of Parks and Recreation of the
City of Webster Groves.
103.5 Plan Review: The Department of Planning and Development will review the following plans for
their conformance to the Land Disturbance Code:
1. Major Land Disturbance Activities; or
2. Ordinary Land Disturbance Activities; or
3. Land Disturbance Activities located within the road right-of-way of the City of Webster Groves;
or
4. Land Disturbance Activities within or directly abutting areas designated as the one hundred (100)
year flood plain.
The Department of Planning and Development will issue a Land Disturbance Permit for all Land
Disturbances.
Exception: The Department of Planning and Development may delegate the review of plans for
land disturbance activities located within the road right-of-way.
SECTION 104.0 VIOLATIONS
104.1 Unlawful acts: It shall be unlawful for any person, firm, corporation or other entity to perform any
Land Disturbance Activities, or cause or allow same to be done in conflict with or in violation of any of
the provisions of this Article.
104.2 Notice of Violation: When the Department of Planning and Development determines that a
violation of this Article exists, the Director shall notify the violator. The notification shall be in writing
and shall be delivered to the violator or his/her legally authorized representative or mailed to his last
known address via first class mail postage prepaid. Any person having been so notified that a violation
exists and who fails to abate the violation within ten (10) days after said notification, shall be subject to
the penalties enumerated in Sections 104.4 and 104.4.1.
LDC/BMP 2
104.3 Prosecution of Violation: If the violator does not abate the violation within ten days of notification
as set forth in 104.2, the Department of Planning and Development shall request the City Attorney to
institute the appropriate proceeding at law or in equity to restrain, correct or abate such violation.
104.4 Violation, Penalties: Any person, firm, corporation or other entity who shall violate any provision
of this Article, or who shall fail to comply with any of the requirements herein, or who shall perform
work in violation of the approved construction documents or the Storm Water Pollution Prevention Plan,
or any directive of the Department of Planning and Development, or of a permit or certificate issued
under the provisions of this Article, or who shall start any work requiring a permit without first obtaining
a permit therefore, or who shall continue any work in or about a structure after having been served a stop -
work order, except for such work which that person, firm or corporation has been directed to perform to
remove a violation or unsafe condition, or any person who commits, takes part or assists in any violation
of this Article or who maintains any property on which such violation shall exist, shall be guilty of a
violation, punishable by a fine of not more than one thousand dollars ($1,000.00) or by imprisonment not
exceeding ninety (90) days, or both such fine and imprisonment. Each day that a violation continues shall
be deemed a separate offense.
104.4.1 No -Permit Penalty: When the Director determines that work has been started prior to the
issuance of a Land Disturbance Permit as required by this Article, the Director shall cause a stop
work order to be issued. The Land Disturbance Permit fee for work so stopped shall be double
the fee as set forth in Section 108 herein, including inspections. The decision of the Director that
work has been started prior to issuance of a permit shall be appealable in the same manner as
other decisions of the Director.
104.5 Abatement of violation: The imposition of the penalties herein prescribed shall not preclude the
City Attorney from instituting appropriate action to prevent unlawful construction or to restrain, correct or
abate a violation, or to prevent illegal use of a property or to stop an illegal act.
104.6 Permit Suspension or Revocation: When a Land Disturbance Activity is conducted in violation of
the requirements of this Article or the terms of the permit in such a manner as to materially and adversely
affect the safety, health or welfare of persons, or to be materially detrimental or injurious to property or
improvements, the Department of Planning and Development may suspend or revoke such permit.
104.7 Stop Work Order: Upon notice from the Department of Planning and Development that work on
any property is being prosecuted contrary to the provisions of this Article or in an unsafe and dangerous
manner, such work shall be immediately stopped. The stop work order shall be in writing and shall be
posted on the property, or given to the owner of the property involved, or to the owner's agent, or to the
person doing the work; and shall state the conditions under which work will be permitted to resume.
Where an emergency exists, the Director shall not be required to give a written notice prior to stopping
the work.
104.7.1 Unlawful Continuance: Whenever a stop work order has been issued as provided herein,
the owner or the person performing such work shall immediately stop such work. Any person,
who shall continue any work in or about the property after having been served with a stop work
order, except such work as that person is directed to perform to remove a violation or unsafe
condition, shall be subject to penalties as specified in Sections 104.4 or 104.4.1 of this Article.
105.0 APPEALS
10.5.1 Application for appeal: Any person shall have the right to appeal a decision of the Director to the
Board of Adjustment pursuant to the procedures set forth in Chapter 20 of the Municipal Code.
LDC/BMP 3
105.2 Basis for Appeals: An appeal shall be based solely on a claim that:
1. the true intent of this Article or the rules or regulations legally adopted thereunder have been
incorrectly interpreted; or
2. the provisions of this article do not fully apply; or
3. an equally good or better form of construction is proposed.
SECTION 106.0 LAND DISTURBANCE PERMITS REQUIRED
106.1 City Permit Required: Except as provided for in section 106.3 of this Article, any person who
intends to conduct any Major or Ordinary Land Disturbance Activity, as defined herein, must obtain a
Land Disturbance Permit prior to beginning the activity.
106.1.1 Applications: Applications for Major Land Disturbance Permits and Ordinary Land
Disturbance Permits shall be filed with the Department of Planning and Development.
106.1.2 City Building Permit and related Ordinary Land Disturbance Activities: The
Department of Planning and Development may include Ordinary Land Disturbance Activities
associated with the construction of a building, structure, or parking lot authorized by a permit
issued under- the building code, as an integrated permit for the proposed construction.
106.2 Limitation on Transfer of Land Disturbance Permits: Any person who buys or otherwise
acquires land from a person or entity that has been issued a Land Disturbance Permit under this Article
must obtain a separate land disturbance permit from the City. Such permits are not transferable.
Exception: Land Disturbance permits may be transferred to a new land owner provided the
original permit holder obtains the approval of the Department of Planning and Development to
retain responsibility for the Land Disturbance Activities on such property.
106.3 Land Disturbance Permit Exceptions — Land Disturbance Permits are not required under the
following circumstances:
106.3.1 Minor Grading — Land Disturbance permits are not required for the following specific
activities, provided the activity does not alter, or cause to alter, the present surface of the ground
by any cut or fill: a) within four feet of a property line; or b) that would permanently divert one
drainage area to another drainage area; or c) that would deposit mud or harmful silt or create
erosion or damage adjoining properties; or d) that would block or affect an existing swale or
drainage path in a manner to cause damming and ponding:
1. Gardening and similar activities on property occupied by one- or two-family dwellings.
2. Land Disturbance Activities associated with additions to and accessory structures,
including in -ground swimming pools, for one- and two-family dwellings.
3. Land Disturbance activities for construction other than those exempted by Exemption #2
above involving less than thirty (30) cubic yards of earth/soil moved and less than two
thousand (2,000) square feet of disturbed area provided the Land Disturbance Activity is
for the improvement of the property. Erosion and sediment control measures shall be
provided when necessary until grass or other vegetation is established or other approved
means of ground cover means are used.
LDC/BMP 4
4. Removal of existing or dying grass or similar vegetation by disturbing not more than
10,000 square feet and re -sodding or re -seeding with new landscaping to include
preparation of the seed bed; provided erosion and sediment control measures are provided
until grass or other vegetation is established; and provided any cut and fill in conjunction
with the preparation of the seedbed shall not exceed thirty (30) cubic yards.
5. Existing farming, nursery and agricultural operations conducted as a permitted or
accessory use.
106.3.2 Public Entities
1. Land Disturbance Activities by any public utility; for the installation, inspection, repair or
replacement of any of its equipment or for its collection or distribution lines or piping
systems; provided erosion and sediment control measures are provide until grass or other
vegetation is established or other approved ground cover means are used. This exception
does not apply to any Land Disturbance Activity associated with work that requires a
building permit.
2. Land Disturbance Activities by the following Governmental Agencies when acting in
their official capacity:
a. City of Webster Groves Departments of Public Works
b. City of Webster Groves Department of Parks and Recreation
c. St. Louis County Department
d. Missouri State Highway Department
106.3.3 Emergencies -- Any emergency activity that is immediately necessary for the protection
of life, property, or natural resources.
106.4 State of Missouri Permits Required: The permit applicant must obtain a land disturbance permit
from the State of Missouri Department of Natural Resources for any site where one (1) acre or more of
land will be disturbed, before beginning any site work authorized by a City permit. This requirement
applies to sites of less than one (1) acre that are part of a proposed development that will ultimately
disturb one (1) acre or more.
SECTION 107.0 LAND DISTURBANCE PERMIT APPLICATIONS
107.1 Permit applications: Applications for Land Disturbance permits required by this Article shall be in
the form prescribed by, and accompanied by the site plans and documents determined necessary by, the
Department of Planning and Development.
107.2 Storm Water Pollution Prevention Plan (SWPPP) Required for Major Land Disturbance
Permits: All applications for Major Land Disturbance Permits shall be accompanied by a Storm Water
Pollution Prevention Plan, prepared for the specific site by or under the direction of a Qualified
Professional. The application shall contain a statement that any land clearing, construction, or
development involving the movement of earth shall be in accordance with the Storm Water Pollution
Prevention Plan, and the applicant will assume and acknowledge responsibility for compliance with this
Article and the Storm Water Pollution Prevention Plan at the site of the permitted activity.
107.3 Required Site Development Escrows for Major Land Disturbance Permits: Applicants for
Major Land Disturbance permits shall file a site development escrow, in the form of a letter of credit, cash
deposit or other improvement security in an amount deemed sufficient by the Department of Planning and
LDC/BMP 5
Development to cover all costs of installation and maintenance of each Best Management Practice
proposed in the SWPPP for such period as specified by the Department of Planning and Development.
The site development escrow shall include engineering and inspection costs sufficient to cover the cost of
failure, or repair, of improvements installed on the site.
107.3.1 Release of Escrows - Project Closure: Any site development escrow or deposit will not
be fully released to the property owner, site operator or permit holder until all of the following
have been completed:
1. All temporary storm water control Best Management Practices (BMP's) have been
removed and the site has been fully stabilized.
2. All permanent storm water control Best Management Practices (BMP's) have been
completed.
3. All final inspections/certifications have been completed.
107.3.2 Use of Escrows by City: At any time following the suspension or revocation of a Land
Disturbance Permit, the City may utilize site development escrow funds to implement or restore a
BMP due to the failure of the property owner, site operator, or permit holder to install a required
BMP or remedy a deficiency arising during the course of the land disturbance activity.
107.4 Submittal Requirements for Ordinary Land Disturbance Permits: Submittal requirements for
Ordinary Land disturbance permits shall be as required by Chapter 20 Article I of the Municipal Code.
(Adopts Building Code — refer to Appendix J, Appendix U, and Appendix W)
SECTION 108.0 FEES
108.1 Issuance of Permits: Land Disturbance permits shall not be issued until the fees associated with
the permits are paid as specified in Sections 108.1.1 through 108.1.2 of this Article.
108.1.1 Department of Planning and Development: Fees for plan review, inspection, and
permit administration by the Department of Planning and Development related to Land
Disturbance permits shall be in accordance with the fee rates for building permits as set forth in
Chapter 20 of the Municipal Code. In applying the Fee Schedule, the total estimated cost of Land
Disturbance Activities shall include applicable grubbing, site clearing, rough grading, sediment
and erosion control measures, excavating, backfill, final grading, concrete flatwork, asphalt
pavement, and final landscaping. The Department of Planning and Development may require a
bona fide contract(s) or affidavit(s) of the applicant and owner of the project, in which the
applicant and owner verify the total cost of the site improvements related to the permit. The
Department of Planning and Development is authorized to establish the fee by determining the
plan review cost and estimating the total number of inspections required, when in the opinion of
the Department of Planning and Development, the fee resulting from this method more closely
relates to the cost of enforcing the requirements of this Article.
108.1.2 Department of Public Works: Fees for the activities related to Land Disturbance
permits that are normally under the jurisdiction of the Department of Public Works shall be in
accordance with the fee rates set forth in Chapter 10 of the Municipal Code.
LDC/BMP 6
SECTION 109.0 INSPECTIONS
109.1 Typical Inspection Requirements: The City department(s) having enforcement authority and
responsibilities described in Section 103.0 of this Article shall make inspections as herein required and
shall either approve that portion of the work completed or shall notify the permit -holder where the work
fails to comply with the SWPPP as approved. Plans for land disturbance, stripping, excavating, and filling
work bearing the stamp of approval of the City department issuing the permit shall be maintained at the
site during the progress of the work. To obtain inspections, a permit -holder shall notify the Department of
Planning and Development or the Department of Public Works at least two (2) working days before the
following:
1. Pre -construction
2. Post -Installation of sediment and erosion measures
3. Completion of site clearing
4. Completion of rough grading
5. Completion of final grading
6. Close of the construction season
7. Completion of final landscaping
109.2 Extra Inspections: In addition to the inspections otherwise required, the Department of Planning
and Development and the Department of Public Works are authorized to perform and charge fees for
extra inspections or re -inspections which in their judgment are reasonably necessary due to non-
compliance with the requirements of this Article, or work not ready or accessible for inspection when
requested.
109.3 Pre -Land Disturbance Inspection: After a Major Land Disturbance permit is issued by the
Department of Planning and Development, and prior to any site disturbance activity, an Inspection must
be obtained from the Department of Planning and Development.
109.4 Permit -Holder Inspection and Report Responsibilities - Major Land Disturbances: In the
event the Director determines that a proposed Land Disturbance Activity may require extraordinary
monitoring to assure compliance with an approved Storm Water Pollution Prevention Plan (SWPPP), the
City may require and the holder of a Major Land Disturbance Permit, or his/her agent, shall cause regular
inspections of land disturbance sites by a qualified Special Inspector retained by the Permit holder.
Inspections shall include all erosion and sediment and other pollutant control measures, outfalls and off -
site receiving waters in accordance with the inspection schedule outlined in the approved Storm Water
Pollution Prevention Plan (SWPPP). Inspections must be scheduled at least three (3) times per month and
no later than 72 hours after heavy rain. The purpose of such inspections will be to ensure proper
installation, operation and maintenance of Best Management Practices (BMP's) and to determine the
overall effectiveness of the Storm Water Pollution Prevention Plan (SWPPP) and the need, if any, for
additional control measures. All inspections shall be documented in writing on forms provided by the
Department of Planning and Development, and submitted weekly to the Department of Planning and
Development at the time interval specified in the permit.
109.4.1 Notification and Correction of Deficiencies - The permit -holder shall notify the site
contractor(s) responsible for any deficiencies identified so that deficiencies can be corrected
within seven calendar days of the weekly inspection report.
109.4.2 City Inspections: The Department of Planning and Development may make inspections
as deemed necessary to ensure the validity of the reports filed under section 109.2 of this Article
or to otherwise ensure proper installation, operation and maintenance of storm water Best
LDC/BMP 7
Management Practices (BMP's), to determine the overall effectiveness of the Storm Water
Pollution Prevention Plan (SWPPP), and to assess the need for additional control measures.
SECTION 20.0020B DEFINITIONS.
SECTION 201.0 DEFINITIONS
201.1 Definitions: For the purpose of this Article, the following terms, phrases, words, and their
derivations shall have the meanings given herein. Where terms are not defined by this section, such terms
shall have ordinarily accepted meanings such as the context implies.
Article, this Article, Article III: The "Land Disturbance Code" of the City of Webster Groves, Missouri,
as adopted by Ordinance.
Best Management Practices (BMP's): Practices, procedures or a schedule of activities to reduce the
amount of sediment and other pollutants in storm water discharges associated with construction and Land
Disturbance Activities.
City: City of Webster Groves, Missouri.
Clearing: Any activity that removes the vegetative surface cover.
Code of Webster Groves: The Revised Code of Ordinances of the City of Webster Groves, Missouri as
amended from time to time.
County: St. Louis County, Missouri.
Construction Site or Land Disturbance Site: A parcel or contiguous parcels, where Land Disturbance
Activities are performed as part of a proposed development.
Department of Finance: The Department of Finance of the City of Webster Groves, Missouri.
Department of Planning and Development: The Department of Planning and Development of the City
of Webster Groves, acting through its Director, or his/her duly authorized designee.
Department of Public Works: The Department of Public Works of the City of Webster Groves, acting
through its Director, or his/her duly authorized designee.
Director: The Director of the Department of Planning and Development of the City of Webster Groves,
Missouri or his/her duly authorized designee.
Drainage Way: Any channel that conveys surface runoff through a site.
Erosion: The wearing away of land surface through the action of wind or water.
Erosion Control: Any Best Management Practices (BMP's) that prevents or minimizes erosion.
Grading: Reshaping the ground surface through excavation and/or fill of material, including the resulting
conditions.
LDC/BMP 8
Heavy Rainfall: A rainfall intensity that causes erosion.
Historic Preservation Commission: The Historic Preservation Commission of the City of Webster
Groves, Missouri.
Land Disturbance Activities: Any activity such as clearing, grading or any other land disturbance
related work which results in removal of the natural site vegetation and destruction of the root zone or
otherwise results in leaving the ground surface exposed to soil erosion through the action of wind or
water.
Land Disturbance Code: The Land Disturbance Code of the City of Webster Groves as adopted by
Ordinance and its amendments.
Land Disturbance, Major: Any Land Disturbance Activity involving one (1) acre or more of land, or a
site involving less than one (1) acre that is part of a common plan proposed development that will disturb
one (1) acre or more.
Land Disturbance, Ordinary: Any Land Disturbance Activity involving less than one (I) acre of land.
Land Disturbance Permit: A permit issued by the City of Webster Groves authorizing a Land
Disturbance Activity at a specific site subject to conditions stated in the permit. A Permit may be for any
one or more Major or Ordinary Land Disturbance Activities.
Municipal Code: The Code of Webster Groves, Missouri.
Perimeter Control: A barrier that prevents sediment from leaving a site by filtering sediment laden
runoff or diverting it to a sediment trap or basin.
Phasing: Clearing a parcel of land in distinct phases stages, with the stabilization of each phase
substantially completed before the clearing of the next.
Qualified Professional: A Missouri licensed professional engineer or other person or firm certified by an
agency approved by the Director in the principles and practices of erosion and sediment control, including
the Best Management Practices described in this Article.
Runoff Coefficient: The fraction of total rainfall that exits at the outfalls from a site.
Sediment Control: Any Best Management Practices (BMP's) that prevents eroded sediment from
leaving a site.
Special Inspector: A person as herein required who has the special expertise to ensure compliance with
the approved Land Disturbance Code and Best Management Practices (BMP's) of the City of Webster
Groves.
Stabilization: The use of Best Management Practices (BMP's) that prevent exposed soil from eroding
from a land disturbance site.
Start of Construction: The first Land Disturbance Activity associated with a development.
Storm Water Pollution Prevention Plan (SWPPP): A management plan, the purpose of which is to
ensure the design, implementation, management and maintenance of Best Management Practice (BMP) in
LDC/BMP 9
order to reduce the amount of sediment and other pollutants in storm water discharges associated with
Land Disturbance Activities, comply with the standards of the City of Webster Groves and ensure
compliance with the terms and conditions of the applicable state permits, including adherence to the land
disturbance program contained in Missouri State issued MS4 NPDES permits.
Water Course: A natural or artificial channel or body of water, including but not limited to, lakes, ponds,
rivers, streams, ditches and other open conveyances that carry surface runoff water either continuously or
intermittently.
SECTION 20.0030B DESIGN REQUIREMENTS.
SECTION 301.0 GENERAL
301.1 Design Guidelines: The Model Best Management Practices (BMP's) for Land Disturbance,
Sediment and Erosion Control of St. Louis County, as adopted herein, shall be the general design
guidelines for addressing land disturbance activities.
301.2 State Operating Permit from the Missouri Department of Natural Resources: Prior to any
Major Land Disturbance Activity, an Operating Permit from the State of Missouri Department of Natural
Resources will be required.
301.3 Tree Preservation Permit from the Department of Planning and Development Prior to any
Land Disturbance Activity, a tree preservation permit from the Department of Planning and Development
will be required. (See Chapter 10, Article IV of the Code of Webster Groves.)
301.4 Requirements of Permit Holder The permit -holder shall sign a `Developer Agreement' attesting
to the following:
1. Notify all contractors and other entities (including utility crews, City employees, or their agents)
that will perform work at the site, of the existence of the Storm Water Pollution Prevention Plan
(SWPPP) and what actions or precautions shall be taken while on site to minimize the potential
for erosion and the potential for damaging any Best Management Practices (BMP's);
2. Determine the need for and establish training programs to ensure that all site workers have been
trained, at a minimum, in erosion control, material handling and storage, and housekeeping; and
3. Provide copies of the Storm Water Pollution Prevention Plan (SWPPP) to all parties who are
responsible for installation, operation or maintenance of any Best Management Practices
(BMP's); and
4. Maintain a current copy of the Storm Water Pollution Prevention Plan (SWPPP) on the site at all
times.
301.5 Submission Requirements of the Department of Planning - The submission requirements of the
Department of Planning and Development are as follows:
1. Completed application on a form provided by the Department of Planning and Development
2. Four (4) copies of the sketch plan
3. Four (4) copies of the SWPPP (the sketch plan and SWPPP maybe incorporated into one plan)
4. Application Fee
LDC/BMP 10
301.6 Issuance of Permit: Land Disturbance Permits shall be issued upon the following:
1. Approval of a SWPPP for the proposed Land Disturbance Activity
2. issuance of Tree Preservation Permit, if required.
3. Payment of Permit and inspection fees as provided in Section 108.
4. Payment of escrow per Section 107.3, if required
5. Receipt of State Operating Permit issued by Missouri Department of Natural Resources
6. Signed Developer Agreement
7. Identification and qualifications of retained Special Inspector, if required.
SECTION 302.0 STORM WATER POLLUTION PREVENTION PLANS (SWPPP)
302.1 General: A Storm Water Pollution Prevention Plan (SWPPP), signed and sealed by a Professional
Engineer licensed in the State of Missouri, must be submitted for any Major Land Disturbance Activity.
The plans shall contain a statement that any land clearing, construction, or development involving the
movement of earth shall be in accordance with the Storm Water Pollution Prevention Plan, and the person
issued a Land Disturbance Permit assumes and acknowledges responsibility for compliance with the Land
Disturbance Code and the approved Storm Water Pollution Prevention Plan at the site of the permitted
activity.
302.2 Storm Water Pollution Prevention Plan (SWPPP) Contents: A Storm Water Pollution
Prevention Plan (SWPPP) shall include the following information:
1. Name, address and telephone number of the site owner and the name, address and 24 hour
telephone number of the individual who will be in overall responsible charge of
construction/development activities at the site.
2. Site address or location description and parcel identification number(s).
3. A site map showing the outlines of the total project area, the areas to be disturbed, existing land
uses, locations and names of surface water bodies, locations of flood plains, and locations of
temporary and permanent Best Management Practices (BMP's).
4. Existing contours of the site and adjoining strips of off -site property and proposed contours after
completion of the proposed land disturbance and development, based on United States Geological
Survey datum, with established elevations at buildings, walks, drives, street and roads; and
information on necessary clearing and grubbing, removal of existing structures, excavating,
filling, spreading and compacting.
5. A natural resources map identifying soils, forest cover, and resources protected under other
provisions of the Code of Webster Groves.
6. An estimate of the Runoff Coefficient of the site prior to disturbance and the Runoff Coefficient
after the construction addressed in the permit application is completed.
7. Estimated quantity of land to be disturbed.
8. Details of the site drainage pattern both before and after Major Land Disturbance Activities.
9. Access to the construction site.
10. Description of the Best Management Practices (BMP's) to be utilized to control erosion and
sedimentation during the period of land disturbance. A table is to be provided that lists each BMP
to be utilized and the quantity of each (the quantity for silt fence, etc. is to be listed in linear
footage).
1 1 . Description of the Best Management Practices (BMP's) to be utilized to prevent other potential
pollutants (construction wastes, toxic or hazardous substances, petroleum products, pesticides,
herbicides, site litter, sanitary wastes, etc.) from entering the natural drainage ways during the
period of construction and land disturbance.
LDC/BMP 11
12. Description of the Best Management Practices (BMP's) that will be installed during land
disturbance to control pollutants in storm water discharges that will occur after land disturbance
activity has been completed.
13. Location of temporary off-street parking, and wash -down area for related vehicles.
14. Sources of off -site borrow material or spoil sites, and all information relative to haul routes,
trucks and equipment.
15. The anticipated sequence of construction and Land Disturbance Activities, including installation
of Best Management Practices (BMP's), removal of temporary Best Management Practices
(BMP's), stripping and clearing; rough grading; construction utilities, infrastructure, and
buildings; and final grading and landscaping. Sequencing shall identify the expected date(s) on
which clearing will begin, the estimated duration of exposure of cleared areas, areas of clearing,
installation of temporary erosion and sediment control measures, and establishment of permanent
vegetation.
16. All erosion and sediment control measures necessary to meet the objectives of this ordinance
Code throughout all phases of construction and after completion of site development. Depending
upon the complexity of the project, the drafting of intermediate plans may be required at the close
of each season.
17. Seeding mixtures and rates, types of sod, method of seedbed preparation, expected seeding dates,
type and rate of lime and fertilizer application, and kind and quantity of mulching for both
temporary and permanent vegetative control measures.
18. Provisions for maintenance of control facilities, including easements.
19. Plans for responding to any loss of contained sediment to include the immediate actions the
permit -holder will take in case of a containment failure. This plan must include documentation of
actions and mandatory reporting to the Department of Planning and Development.
20. Schedules and procedures for routine inspections of any structures provided to prevent pollution
of storm water or to remove pollutants from storm water and of the site in general to ensure all
Best Management Practices (BMP's) are continually implemented and are effective.
302.3 Simplified SWPPP: Major Land Disturbance Activities meeting all of the following conditions
may submit a Simplified SWPPP:
1. Area(s) of land disturbance total more than 1 acre but are less than 5 acres
2. Minimal change (approximately < 1 foot) in grade elevation for entire area of disturbance
3. Purpose is to restore an unpaved surface such as a sports field, etc.
3023.1 Simplified SWPPP Contents - The following information shall be shown on the SWPPP
in conjunction with all information required on a sketch plan*:
1. Show existing & proposed contours, and land disturbance limits (i.e. by shading, etc.).
2. Show and label perimeter siltation control around or along the disturbance required for
any situation where the area of disturbance would drain onto adjacent public or private
property. Show siltation control around inlets or storm sewer systems that could receive
water from the disturbed area. Provide BMP quantities of materials to be disturbed and
details on the plan.
3. Show and label the temporary entrances and washdown area:
4. Add statement/notes:
a. Any land clearing, construction, or development involving the movement of earth
shall be in accordance with the Storm Water Pollution Prevention Plan, and the
person issued a Land Disturbance Permit assumes and acknowledges
responsibility for compliance with the Land Disturbance Code and the approved
Storm Water Pollution Prevention Plan at the site of the permitted activity.
LDC/BMP 12
b. Clearing techniques that retain existing vegetation to the maximum extent
practicable shall be used and the time period for disturbed areas to be without
vegetative cover shall be minimized to the extent practical.
c. Additional siltation control shall be installed as required by the Department of
Planning and Development.
d. Areas shall be seeded when no activity will occur within thirty days.
5. List the name, address and 24 hour telephone number of the individual who will overall
be responsible (in charge of) construction activities at the site.
6. Signed and sealed by a Missouri Professional Engineer
302.3.2 Additional Contents - No additional information will be required on the plan unless
otherwise determined by the Department of Planning and Development.
302.4 Storm Water Pollution Prevention Plan (SWPPP) for Clearing and Grubbing: The following
minimum information must be shown on a SWPPP submitted for clearing and grubbing only:
1. All information required on a sketch plan, as required by the Department of Planning and
Development.
2. Show existing contours, and only those proposed contours necessary for the construction of a
temporary entrance and washdown area, etc.
3. Clearly show clearing and grubbing limits (i.e. by shading, etc.)
4. Show and label perimeter siltation control.
5. Show and label temporary entrances and washdown area.
6. List BMP's and provide quantities of materials to be disturbed.
7. Show BMP details.
8. Missouri P.E. sign and seal plan.
9. Add statement: Anyland clearing, construction, or development involving the movement of earth
shall be in accordance with the Storm Water Pollution Prevention Plan, and the person issued a
Land Disturbance Permit assumes and acknowledges responsibility for compliance with the Land
Disturbance Code and the approved Storm Water Pollution Prevention Plan at the site of the
permitted activity.
10. Add notes:
a. Clearing techniques that retain existing vegetation to the maximum extent practicable
shall be used and the time period for disturbed areas to be without vegetative cover shall
be minimized to the extent practical.
b. Additional siltation control shall be installed as required by the Department of Planning
and Development.
c. Areas shall be seeded after clearing and grubbing when no activity will occur within
thirty days.
d. A Storm Water Pollution Prevention Plan (SWPPP) and a Major Land Disturbance
(MLD) Permit will be required prior to any grading on the site, beyond what is approved
on this plan.
11. List name, address and 24 hour telephone number of the individual who will overall be
responsible (in charge of) construction/development activities at the site.
302.5 Permit Requirements for Test Holes: "Land Disturbance Activities" are defined as any activity
such as clearing & grubbing, grading and any other land disturbance work that results in the removal of
the natural site vegetation and destruction of the root zone, or otherwise results in leaving the ground
surface exposed to soil erosion through the action of wind or water.
LDC/BMP 13
If the area of the test hole excavation, the area where the excavation is stockpiled temporarily, the path
created by machinery to get to the test hole locations, or any other additional area of disturbance needed
to perform the work, fall under the above definition for "Land Disturbance Activities", and collectively
total the following amounts, the following requirements apply:
Collective Total Amount
Requirement
Greater than 1 acre, and includes grading other
than the excavation for each test hole
Need SWPPP approval and a Major Land
Disturbance Permit
Greater than 1 acre, and does not include
grading other than the excavation for each test
hole
Need to meet the SWPPP requirements for
clearing and grubbing and a Major Land
Disturbance Permit
Greater than 2000 sq. ft. and less than 1 acre
Need an Ordinary Land Disturbance Permit
Less than 2000 sq. ft., and includes grading
other than the excavation for each test hole in
an amount greater than 30 cubic yards
Need an Ordinary Land Disturbance Permit
Less than 2000 sq. ft., and includes grading
other than the excavation for each test hole in
an amount less than 30 cubic yards
No Land Disturbance Permit required
Note: A permit will be required from the Department of Planning and Development for the
construction of a temporary entrance.
302.6 Amending the Storm Water Pollution Prevention Plan: The permit -holder shall amend the
Storm Water Pollution Prevention Plan whenever:
1. Design, operation or maintenance of Best Management Practices (BMP's) is changed.
2. Design of the construction project is changed that could significantly affect the quality of the
storm water discharges;
3. Site operator's inspections indicate deficiencies in the Storm Water Pollution Prevention Plan
(SWPPP) or any Best Management Practices (BMP's).
4. Inspections by the Department of Planning and Development or by the Missouri Department of
Natural resources indicate deficiencies in the Storm Water Pollution Prevention Plan (SWPPP) or
any Best Management Practices (BMP's).
5. The Storm Water Pollution Prevention Plan (SWPPP) is determined to be ineffective in
significantly minimizing or controlling erosion or excessive sediment deposits in streams or
lakes.
6. The Storm Water Pollution Prevention Plan (SWPPP) is determined to be ineffective in
preventing pollution of waterways from construction wastes, chemicals, fueling facilities,
concrete truck washouts, toxic or hazardous materials, site litter or other substances or wastes
likely to have an adverse impact on water quality;
7. Total settleable solids from a storm water outfall exceeds 0.5 ml/L/hr if the discharge is within
the prescribed proximity of a "Valuable Resource Water" as defined by the Missouri Department
of Natural Resources;
8. Total settleable solids from a storm water outfall exceeds 2.5 ml/L/hr for any other outfall; or
9. The Department of Planning and Development or the Missouri Department of Natural Resources
determines violations of water Quality Standards may occur or have occurred.
SECTION 303.0 PERFORMANCE STANDARDS
LDC/BMP 14
303.1 Design of Erosion and Sediment Controls: The design of erosion and sediment controls required
for Land Disturbance Activities shall comply with the following minimum requirements:
1. Land disturbance, erosion and sediment control practices, and watercourse crossings shall be
adequate to prevent transportation of sediment from the site.
2. Materials brought to any site or property under a permit issued under the Land Disturbance Code,
where said material is intended to be utilized as fill material at the site for land disturbance,
erosion or sediment control, shall consist of clean uncontaminated inert materials (soil, rock,
concrete, ,sand, etc. void of any asphaltic concrete, wood, metals, plastics, textiles, hydrocarbons,
etc.). Sludge of any kind may not be used as a clean fill.
3. Cut and fill slopes shall be no greater than 3:1 except as approved by the Department of Planning
and Development to meet other community or environmental objectives.
4. Clearing and grading of natural resources, such as forests and wetlands, shall not be permitted,
except when in compliance with the Code of Webster Groves.
5. Clearing techniques that retain existing vegetation to the maximum extent practicable shall be
used and the time period for disturbed areas to be without vegetative cover shall be minimized to
the extent practical.
6. Clearing, except that necessary to establish sediment control devices, shall not begin until all
sediment control devices have been installed and have been stabilized.
7. Phasing shall be required on all sites disturbing greater than thirty (30) acres of land. The size of
each phase to will be established by the Department of Planning at the time of plan review for the
issuance of a Major Land Disturbance permit.
303.1.1 Erosion Control Requirements: Erosion control requirements shall include the following:
1. Soil stabilization shall be completed within five days of clearing or inactivity in
construction.
2. If seeding or another vegetative erosion control method is used, it shall become
established within two weeks or the site shall be re -seeded or a non -vegetative option
employed.
3. Techniques shall be employed to ensure stabilization on steep slopes and in drainage
ways.
4. Soil stockpiles must be stabilized or covered at the end of each workday or perimeter
controls must be in place to prevent silt from the stockpile from leaving the site.
5. The entire site must be stabilized, using a heavy mulch layer or another method that does
not require germination to control erosion, at the close of the construction season.
6. Techniques shall be employed to prevent the blowing of dust or sediment from the site.
7. Techniques shall be employed to divert upland runoff past disturbed slopes.
303.1.2 Sediment Control Requirements: Sediment control requirements shall include:
1. Sediment basins, sediment traps, or tanks and perimeter controls.
2. Sediment basins shall be provided for each drainage area within 10 or more acres
disturbed at one time and shall be sized to contain 0.5 inch of sediment from the drainage
area and be able to contain a 2 -year, 24 -hour storm. If the provision of a basin of this size
is impractical, other similarly effective Best Management Practices (BMP's), as
evaluated and specified in the Storm Water Pollution Prevention Plan (SWPPP), shall be
provided.
3. Sediment basins shall be designed in a manner that allows adaptation to provide long-
term storm water management, as required by the Department of Planning and
Development.
LDC/BMP 15
4. Sediment basins shall have stabilized emergency spillways to minimize the potential for
erosion of the spillway or basin embankment.
5. Protection for adjacent properties by the use of a vegetated buffer strip in combination
with perimeter controls.
303.2 Water Course Protection Requirements: Water course protection requirements shall include:
1. Encroachment into or crossings of active water courses / riparian areas and wetlands shall be
avoided to the maximum extent practicable. All County, State and Federal permits and approvals
shall be obtained by a permit holder prior to beginning work authorized by a Land Disturbance
permit issued by the Department of Planning and Development.
2. Stabilization of any watercourse channels before, during, and after any in -channel work.
3. If a defined watercourse is to be re -aligned or re -configured, clearing and grubbing activities
within 50 feet of the watercourse shall not begin until all materials and equipment necessary to
protect the watercourse and complete the work are on site. Once started, work shall be completed
as soon as possible. Areas within 50 feet of the watercourse shall be re -contoured and re -
vegetated, seeded or otherwise protected within five working days after land disturbance
activities have ceased.
4. All storm water conveyances shall be designed according to the criteria of the Metropolitan Saint
Louis Sewer District (MSD) and the necessary MSD permits obtained.
5. Stabilization adequate to prevent erosion shall be provided at the outlets of all pipes and paved
channels.
303.3 Construction Site Access Requirements: Construction site access requirements for Major Land
Disturbance Activities shall include:
1. A temporary access road provided at all land disturbance sites including a wash down area
supporting all active sites.
2. The Department of Planning and Development may require other measures to ensure that
construction vehicles do not track sediment onto public streets or be washed with wash effluent
channeled directly into storm drains.
303.4 Control Requirements for Construction Materials: Control requirements for construction
materials, construction wastes and other wastes generated on site at land disturbance sites shall include
provisions, satisfactory to the Department of Planning and Development for:
I. Spill prevention and control facilities for materials such as paint, solvents, petroleum products,
chemicals, toxic or hazardous substances, substances regulated under the Resource Conservation
and Recovery Act (RCRA) or the Comprehensive Environmental Response, Compensation, and
Liability Act (CERCLA), and any wastes generated from the use of such materials and
substances, including their containers. Any containment systems employed to meet this
requirement shall be constructed of materials compatible with the substances contained and shall
be adequate to protect both surface and ground water.
2. Collection and disposal of discarded building materials and other construction site wastes,
including those listed above.
3. Litter control.
4. Control of concrete truck washouts.
5. Assurance that on -site fueling facilities will adhere to applicable federal and state regulations
concerning storage and dispensers.
6. Provision of sufficient temporary toilet facilities to serve the number of workers on Major Land
Disturbance sites.
LDC/BMP 16
304.0 SKETCH PLAN REQUIREMENTS FOR MAJOR LAND DISTURBANCE PERMIT
304.1 Purpose: To allow land disturbance on legal lots prior to submission of a site plan or preliminary
plat for development on the site, the proposed land disturbance should be compatible with development in
the area, and the plan should reflect the minimal amount of land disturbance necessary until a site plan or
preliminary plat is submitted for review. The Sketch plan does not need to be sealed by a registered
engineer or surveyor.
304.2 Sketch Plan Contents: Sketch plan requirements for a Major Land Disturbance Permit shall
include the following:
1. A locator number, address and zoning of the tract.
2. Existing contours.
3. A key map showing the tract in relationship to the surrounding area.
4. The approximate location of all existing structures and current uses within the tract and wooded
areas within the tract and within one hundred (100) feet thereof. All historic buildings, as
identified by the Historic Preservation Commission, should be identified.
5. The name, address, and phone number of the owners of the tract and the same for the permit
applicant if different.
6. All existing roads and approximate location of wet and dry weather water courses, flood plain
areas, sinkholes, and other physical features within the tract and within one hundred (100) feet
thereof.
7. Approximate location of future uses including buildings and parking areas for commercial uses
and lot lines/units for residential uses. Proposed access to the site and proposed roads should be
included. These features do not have to be to scale, but should clarify the relationship of future
uses to the areas being cleared and grubbed.
8. The areas to be cleared and grubbed.
9. Phasing if any. (Required on thirty (30) acres or greater in size)
LDC/BMP 17
"
"
BONDED FIBER MATRIX
PHYSICAL DESCRIPTION:
A bonded fiber matrix (BFM) is a hydraulically applied continuous layer of elongated
fiber strands held together by a water resistant bonding agent designed to protect exposed
soil by eliminating direct impact of precipitation. BFM's adhere directly to the surface of
the soil, eliminating gaps between the product and the soil; therefore, no special treatment
is required at the upstream end of the BFM. BFM's have a high water -holding capacity,
but do not form a water -insensitive crust that would inhibit plant growth. BFM's
biodegrade completely into material known beneficial to plant growth.
WHERE BMP IS TO BE INSTALLED:
Typically installed on slopes where erosion control blankets are impractical and other
mulching methods are inadequate.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow only
WHEN BMP IS TO BE INSTALLED:
Immediately after completion of a phase of grading
INSTALLATION/CONSTRUCTION PROCEDURES:
Follow manufacturer's recommendations to maximize usefulness
O&M PROCEDURES:
1. Inspect every week and after every storm until vegetation is fully established
2. Repair eroded areas and reapply product and vegetation
SITE CONDITIONS FOR REMOVAL:
Typically left in place to degrade naturally
TYPICAL DETAILS: Not Applicable
Land disturbance Code/Best Management Practices - A 1 -
DUST CONTROL
PHYSICAL DESCRIPTION:
Control measures designed to reduce the transport of dust, thereby preventing pollutants
from infiltrating into stormwater. Examples of dust control activities include vegetative
cover, wind barriers, minimization of soil disturbance, spray on adhesives, tilling,
chemical treatment and water sprays.
WHERE BMP IS TO BE INSTALLED:
Critical in areas of exposed soil.
CONDITIONS FOR EFFECTIVE USE OF BMP:
A combination of the following actions should be used to help reduce the dust and air
pollution at a construction site.
Minimize Concurrent Areas of Soil Disturbance - Phase work to the extent practical.
Vegetative Cover - For areas not subjected to traffic, vegetation provides the most
practical method of dust control and should be established as early as possible.
Temporary vegetation should also be used. See Seeding and Sodding BMP's for
additional information.
Sprinkling - The site can be sprinkled with water until the surface is moist. This practice
is effective for dust control on large areas, haul routes or other traffic routes, but constant
repetition is required for effective control.
Tilling - Roughen the surface and bring clods to the surface. This is an emergency
measure that should be used before soil blowing starts. Begin tillage on windward side of
the site. Chisel plows with shanks spaced about 12 inches to 18 inches apart and spring
toothed harrows are examples of equipment that may produce the desired effect. See
Surface Roughening BMP for additional information.
Wind Barriers - Solid board fences, snow fences, burlap fences, crate walls and similar
materials can be used to control air currents and blowing soil. Barriers placed at right
angles to prevailing wing currents at intervals of about 10 times their height are effective
in controlling soil blowing.
Street Cleaning - Paved areas that have soil on them from construction sites should be
cleaned continuously, at least daily, utilizing a street sweeper or bucket type endloader or
scraper.
Mulching - This practice offers a fast and effective means of controlling dust when
properly applied. Binders and tackifiers should be used on organic mulches. Mulching is
Land disturbance Code/Best Management Practices - A 2 -
not recommended for areas with heavy traffic. See Mulching BMP for additional
information.
NOTE: If calcium chloride or spray -on adhesives are used for dust control, a
permit may be required from the Missouri Department of Natural Resources.
WHEN BMP IS TO BE INSTALLED:
Routinely, especially in advance of and during periods of dry weather
INSTALLATION/CONSTRUCTION PROCEDURES: Sce Conditions for Effective
Use above
O&M PROCEDURES:
Inspect daily and renew as needed
SITE CONDITIONS FOR REMOVAL:
Maintain practices until all disturbed areas are vegetated or paved and blowing soil is no
longer a concern.
TYPICAL DETAILS: Not Applicable
Land disturbance Code/Best Management Practices - A 3 -
EROSION CONTROL BLANKETS
PHYSICAL DESCRIPTION:
An erosion control blanket is a preformed protective blanket of plastic fibers, straw or
other plant residue designed to protect soil from the impact of precipitation and overland
flow, and retain moisture to facilitate establishment of vegetation. There are many
products on the market designed for a variety of applications.
WHERE BMP IS TO BE INSTALLED:
Typically installed on slopes or in channels prior to establishment of vegetation.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Several factors, such as soil conditions, steepness and length of slope, depth of flow,
runoff velocities, and time required to establish desired vegetation, influence the choice
of product. Manufacturer's recommendations should be followed. Products are available
for a variety of uses:
Netting - synthetic or natural fiber mesh installed over disturbed area to hold organic
mulch and/or seed in place
Biodegradable Erosion Control Blanket - natural fiber blanket held together by netting
to provide temporary erosion protection on slopes and channels.
Permanent Erosion Control Blanket - synthetic blanket material which provides
permanent erosion control on slopes and channels with increased water flow velocities.
Turf Reinforcement Mat - 3 -dimensional permanent synthetic mat that provides a
matrix to greatly reinforce the root system of the desired vegetation for permanent
erosion protection in high flow channels and on critical slopes.
WHEN BMP IS TO BE INSTALLED:
Dependent upon intended use - immediately after completion of a phase of grading, or
installation of vegetation
INSTALLATION/CONSTRUCTION PROCEDURES:
Follow manufacturer's recommendations and specifications, particularly noting
requirements for check slots, fastening devices and need for firm contact with soil.
O&M PROCEDURES:
1. Inspect every week and after every storm until adequate vegetation is established
2. Repair erosion and/or undermining at top of slope
Land disturbance Code/Best Management Practices - A 4 -
3. Repair undermining beneath blankets - pull back the blanket(s), fill and compact
eroded area, revegetate and then secure blanket(s) firmly
4. Reposition or replace blankets that have moved along the slope or channel and
secure firmly
5. Replace damaged blankets
SITE CONDITIONS FOR REMOVAL:
Temporary blankets will generally degrade naturally; permanent blankets remain in place
TYPICAL DETAILS: Not Applicable
Land disturbance Code/Best Management Practices - A 5 -
MULCHING
PHYSICAL DESCRIPTION:
A layer of organic material designed to protect exposed soil or freshly seeded areas from erosion
by eliminating direct impact of precipitation and slowing overland flow rates. Mulch materials
may include, but are not limited to, such things as grass, hay, straw, wood chips, wood fibers, and
shredded bark.
WHERE BMP IS TO BE INSTALLED:
Typically installed on seeded areas for temporary use, and in landscaped areas for permanent use
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow only
2. Slopes: See attached chart for types of mulch acceptable as a function of slope length and
steepness
3. Mulching Rates: See attached table
WHEN BMP IS TO BE INSTALLED:
Immediately after grading landscaped areas or seeding other areas
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Install upstream BMP's to protect area to be mulched
2. Rough grade area and remove all debris larger than 1 inch if area is to be vegetated and
mowed in the future, larger than 2 inches if area is to be permanently mulched
3. If area is to be seeded, follow requirements of Seeding BMP
4. Spread mulch and anchor by punching it into the ground, using netting, peg and twine, or
tacking with liquid binder
O&M PROCEDURES:
1. Inspect every week and after every storm until adequate vegetation is established;
annually for permanent mulch
2. Protect from vehicular and foot traffic
3. Repair damaged, degraded or eroded areas — reseed as needed and replace mulch
SITE CONDITIONS FOR REMOVAL:
Temporary mulch should be removed when adequate vegetation is established
TYPICAL DETAILS:
Type of mulch required for various slopes and application rates attached
Land disturbance Code/Best Management Practices - A 6 -
MULCH SELECTION AS A FUNCTION OF SLOPE
1:1
2:1-
3:1 —
co
m
C 16%—
o.
of
V 8%.
CO
N
2%-
1%
10' 50' 100'
200'
CO Consider diversions to reduce
slope length
Erosion control blanket
Straw mulch with netting
Straw or grass mulch with
mechanical anchoring or
tacking agent
Slope Length (feet)
1:1
2:1
3:1
to
m
16% 0.
0)
m
8% co
m
-- 4% p
N
— 2%
(1) For slopes steeper than 1:1, consider building a diversion above slope to divert water.
(2) Example: An B% slope, 100 feet long, requires straw mulch with netting
GENERAL MULCH RECOMMENDATIONS TO PROTECT
FROM SPLASH AND SHEET FLOW
Material
Rate Per Acre
Requirements
Notes
Straw
2 to 2.5 tons
Dry, unchopped
unweathered;
avoid weeds
Spread by hand or
machine; must be
tacked or tied down
Wood Fiber or
Wood Cellulose
0.5 to 1 ton
Use with hydro seeder; may
be used to tack straw. Do
not use in hot, dry weather.
Wood Chips
5 to 6 tons
Air dry. Add
nitrogen fertilizer
at 12 lb per ton
Apply with blower, chip
handler, or by hand. Not
for fine turf areas.
Bark
35 cu. yds.
Air dry, shredded,
or hammermilled;
or chips
Apply with mulch blower,
chip handler or by hand.
Do not use asphalt tack.
1%
Land disturbance Code/Best Management Practices - A 7 -
ROCK OUTLET
PHYSICAL DESCRIPTION:
A rock apron installed over a geotextile fabric at a point of concentrated discharge,
designed to slow the velocity of flow and protect the receiving area from erosion.
WHERE BMP IS TO BE INSTALLED:
Installed at BMP outlets, for example, at the end of pipe slope drains, the emergency
overflow or outlet pipe of a sediment basin.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Concentrated flow
2. Flow at Outlet: Maximum velocity of 10 fps
WHEN BMP IS TO BE INSTALLED:
With the construction of the upstream BMP that creates the concentrated discharge.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade subgrade of rock blanket to required section
2. Place filter fabric, providing enough slack to assure that rock will not tear the
fabric when it is placed
3. Install rock with uniform profile and cross section
O&M PROCEDURES:
1. Inspect every week and after every storm during construction
2. Remove sediment and trash accumulation
3. Replace displaced rock - larger rock may be required.
4. Stabilize eroded areas - extend if necessary
SITE CONDITIONS FOR REMOVAL:
Removed concurrently with upstream BMP.
TYPICAL DETAIL: EC -5
Land disturbance Code/Best Management Practices - A 8 -
SEEDING
PHYSICAL DESCRIPTION:
Establishment of vegetation by spreading grass seed designed to protect exposed soil
from erosion by eliminating direct impact of precipitation and slowing overland flow
rates. Once established, the vegetative cover will also filter pollutants from the runoff.
WHERE BMP IS TO BE INSTALLED:
Exposed soil after a phase of rough or finish grading has been completed, or areas where
no activity will occur for 30 days
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow
2. Contributing Slope Length:
• 30 foot maximum for 3:1 slopes
• 50 foot maximum for slope between 3:1 and 10:1
• 100 foot maximum for slopes under 10%
3. Minimum Rates: See attached chart(s)
4. Acceptable Dates: See attached chart
WHEN BMP IS TO BE INSTALLED:
Immediately after rough or finished grading is completed
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Install upstream BMP's to protect area to be seeded
2. Rough grade area and remove all debris larger than 1 inch in diameter and
concentrated areas of smaller debris
3. Install stabilization grids, if needed
4. Mix soil amendments (lime, fertilizer, etc.) into top 3"-6" of soil as needed
5. Plant seed '/4 - '/2 inch deep
6. Roll lightly to firm surface
7. Cover seeded area with mulch unless seeding completed during optimum spring
and summer dates
8. Install additional stabilization (netting, bonded fiber matrix, etc.) as required
9. Water immediately — enough to soak 4 inches into soil without causing runoff
10. Inspect every week and after every storm
11. Protect area from vehicular and foot traffic
12. Reseed areas that have not sprouted within 21 days of planting.
13. Repair damaged or eroded areas and reseed and stabilize as needed
14. Do not mow until 4 inches of growth occurs
15. During the first 4 months, mow no more than 1/3 the grass height
16. Refertilize during 2nd growing season
Land disturbance Code/Best Management Practices - A 9 -
SITE CONDITIONS FOR REMOVAL:
Does not require removal, but temporary seeding can be removed immediately prior to
work returning to an area
TYPICAL DETAILS:
Minimum seeding rates and acceptable dates for work attached
Land disturbance Code/Best Management Practices - A 10 -
SEEDING REQUIIREMENTS
Dates for Seeding
Permanent Seeding
Jan
Feb
Mar
Apr
Mar
Jun
July
Aug
Sep
Oct
Nov
Dec
Tall Fescue
0
00
00
Smooth Brome
0
0
0
00
Fescue & Brome
0
0
0
0
0
Fescue, Rye & Bluegrass
A
A
0
0
0
P
P
0
0
P
P
A
Temporary Seeding
Jan
Feb
Mar
Apr
May
Jun
July
Aug
Sep
Oct
Nov
Dec
Rye or Sudan
AA
0
0
0
0
0
0
0
0
A
A
Oats
A
0
0
0
0
0
0
0
O = Optimum seeding dates
A = Acceptable seeding dates
P = Permitted seeding dates with reseeding 2 months later - Initially use 50% of seed and 75% of fertilizer. Reseed with
additional 75% seed and remaining fertilizer.
Minimum Fertilizer and Seeding Rates
Permanent Seeding
Pounds per acre
Pounds Per 1000 sq. ft.
Tall Fescue
300
7.0
Smooth Brome
200
4.6
Mixture # 1
250
5.7
Mixture # 2
210
4.8
Mixture # 1 = Tall Fescue @ 150 pounds per acre and Brome @ 100 pounds per acre.
Mixture # 2 = Tall Fescue @ 100 pounds per acre; Perennial Rye grass @ 100 pounds per acre;
and Kentucky Blue grass @ 10 pounds per acre.
* = Seeding rate for slopes in excess of 20% (5:1), shall he 10 pounds per 1000 sq. ft.
Temporary Seeding
Pounds per acre
Pounds Per 1000 sq. ft.
Rye or Sudan
150
3.5
Oats
200
2.5
Fertilizer
Permanent Seeding
(pounds per acre)
Temporary Seeding
(pounds per acre)
Nitrogen
45
30
Phosphate
65
30
Potassium
65
30
Lime - ENM
600
600
ENM = Effective neutralizing material per State evaluation of quarried rock.
Land disturbance Code/Best Management Practices - A 11 -
SODDING
PHYSICAL DESCRIPTION:
A %-1 inch thick mat of vigorous turf, free of disease, insects and weeds. Sod prevents
raindrops from disrupting the soil structure and causing erosion. Sod slows water runoff
and acts as a filter when sediment -laden runoff crosses over the sodded area.
WHERE BMP IS TO BE INSTALLED:
Typically installed in areas requiring immediate erosion protection, such as swales or
detention ponds and as filter strips, around inlets, and adjacent to curbs. Also installed in
areas requiring immediate aesthetic appearance or function such as entrances to new
subdivision and off site construction areas.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow and low concentrated flows with velocities less than 5 fps
WHEN BMP IS TO BE INSTALLED
Immediately after finish grading, installation of area inlets, and installation of
underground services and foundations of new homes.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Rough grade area and remove all debris larger than 1/2 inch in diameter and
concentrated areas of smaller debris.
2. Soil preparation of area to be sodded shall be determined by tests to determine
lime and fertilizer requirements. Soil amendments shall be mixed into top 3-6
inches of soil by disking or other means.
3. Level and roll soil lightly to provide an even grade and firm the surface. Soil
should not be excessively wet or dry.
4. Lay first row of sod perpendicular to the slope or direction of flow. Butt
subsequent rows tight against previous rows with strips staggered in brick -like
pattern. Fill minor gaps with good soil and roll entire surface to ensure contact.
5. Stake, staple and/or net corners and centers of sod strips as required.
6. Water immediately after installation enough to soak 4 inches into soil without
causing runoff.
O&M PROCEDURES:
1. Water sod daily for 3 weeks - enough to soak 4 inches into soil without causing
runoff.
2. Reposition areas of sod that has moved along the slope.
3. Remove sediment accumulations — replace sod if necessary.
Land disturbance Code/Best Management Practices - A 12 -
4. Repair any eroded areas, replace sod, and stabilize as needed
5. Do not mow until 3 inches of new growth occurs. During the first 4 months, mow
no more than 1/3 the grass height.
SITE CONDITIONS FOR REMOVAL: Not Applicable
TYPICAL DETAIL: EC -7
Land disturbance Code/Best Management Practices - A 13 -
SOIL BINDERS
PHYSICAL DESCRIPTION:
A material sprayed onto the surface of exposed soils designed to protect against erosion
by wind or runoff. The useful life of most products is 3 to 6 months. Examples of
materials used include vegetable -based adhesives, copolymers, petroleum oils and resin -
emulsions.
WHERE BMP IS TO BE INSTALLED:
Typically used in disturbed areas and in combination with other BMP's such as perimeter
controls, seeding or mulching.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow
WHEN BMP IS TO BE INSTALLED:
Immediately after completion of a phase of grading
INSTALLATION/CONSTRUCTION PROCEDURES:
Follow manufacturer's recommendations to maximize usefulness and avoid formation of
pools or impervious areas where stormwater cannot infiltrate
O&M PROCEDURES:
1. Inspect every week for damage from vehicles, runoff, or freeze -thaw conditions
2. Reapply product or utilize additional BMP
SITE CONDITIONS FOR REMOVAL:
Typically left in place to degrade naturally
TYPICAL DETAILS: Not Applicable
Land disturbance Code/Best Management Practices - A 14 -
STREAM BANK PROTECTION
PHYSICAL DESCRIPTION:
A vegetative, structural or combination treatment of streams designed to stabilize the
stream bank and reduce erosion. It is important to note that a systemic analysis of the
entire reach of stream must be conducted in order to avoid unintended negative impacts
on a stream as a result of a corrective action at an isolated location. A wide array of
products and methodologies can be used to stabilize stream banks: live stakes; cellular
confinement matrices; articulated block pavers; rip rap; gabion baskets; turf
reinforcement mats; fabric formed revetments; cedar tree revetments; straw wattles; grade
control structures; stilling basins; etc.
WHERE BMP IS TO BE INSTALLED:
Open channels downstream from developed areas.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Acceptable methods vary widely due to the unique nature of each reach of channel.
Design considerations include: current and future watershed conditions; discharge;
velocity; sediment load; channel slope; control of bottom scour (incising); soil
conditions; compatibility with other improvements; changes in channel alignment; and
protection and maintenance of fish and wildlife habitats and existing tree canopy.
WHEN BMP IS TO BE INSTALLED:
Well in advance of disturbing any upstream areas in order to give plant material a
relatively long period to become established and allow ample time for inspection and
necessary repairs during construction of the remainder of the development.
INSTALLATION/CONSTRUCTION PROCEDURES:
Procedures are specific to materials used. General construction principles include:
1. Stabilize the channel bottom first to prevent incising and knick points from
undermining the bank protection
2. Start and stop bank protection at stable points along the channel
3. Minimize the size of all disturbed areas and stabilize as soon as each phase of
construction is complete
4. Use other BMP's to prevent runoff from disturbing the stream bank protection
area until it has been completed
5. Store all construction materials well away from the stream
6. At the end of each workday, move all construction equipment out of and away
from the stream to prevent flooding
7. Avoid steep slopes on the stream bank
Land disturbance Code/Best Management Practices - A 15 -
8. Fence the construction area and post warning signs if trespassing or vandalism is
likely
9. Inspect every week and after every storm during construction; and once each
season thereafter
10. Repair, relocate, or add BMP's protecting channel until the stream bank
protection is operational
11. Remove sediment as needed for proper establishment of protection measures
12. Repair gaps in vegetative cover by replacing plants or designing alternative
methods/materials
13. Repair structural systems as needed
SITE CONDITIONS FOR REMOVAL: Not Applicable
TYPICAL DETAILS: Not Applicable
Land disturbance Code/Best Management Practices - A 16 -
TEMPORAR Y STREAM CROSSING
PHYSICAL DESCRIPTION:
A stabilized stream crossing designed to protect the stream banks while facilitating access
for construction vehicles and equipment. Use of temporary stream crossings is
discouraged - crossings are a direct source of pollution and should be avoided if
alternatives are feasible. If the work involves construction below the normal water level
of a defined channel, a permit may need to be obtained from the US Army Corps of
Engineers prior to the City approving the SWPPP.
WHERE BMP IS TO BE INSTALLED:
At locations where work and disruption in creek can be minimized
CONDITIONS FOR EFFECTIVE USE OF BMP:
When no other feasible alternative exists, crossing streams may be permitted. Design
considerations include: current and proposed watershed conditions; average and peak
discharge (2 year, 24 hour storm); effect on water surface elevation off -site; velocity;
sediment removal; and protection of fish and wildlife habits and existing trees. Criteria
for certain types of crossings follow.
Low Water Crossing - Any constant flow less than 3" deep; light traffic; bank height
less than 5 feet; perpendicular to flow or with slight upstream arc
Culvert - Sized for 2 year, 24 hour storm with 1 foot freeboard and no flooding of offsite
areas; pipe parallel to flow; embankment perpendicular to channel or with slight upstream
arc; rip rap on exposed faces sized for overtopping during a peak storm period
WHEN BMP IS TO BE INSTALLED:
During dry periods in advance of need to cross -stream.
INSTALLATION/CONSTRUCTION PROCEDURES:
Procedures are specific to type of crossing used. Procedures for low water crossings and
culverts include:
1. Ensure that all necessary materials are on site before beginning work
2. Provide a stable means to bypass normal channel flow prior to disturbing channel
3. Scarify and stabilize channel bottom to provide even foundation for crossing
4. Install culvert, if needed — place clayey soil to required dimensions around pipe
5. Grade and compact access ramps
6. Place and compact soil embankment for culvert; rip rap for low water crossing, if
needed
Land disturbance Code/Best Management Practices -A 17 -
7. Install fabric under crossing and to required distance from creek bank
8. Install stone on access ramps and cellular confinement system for driving surface
of crossing
9. Place rip rap on faces of and downstream from culvert embankment
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove sediment and trash accumulation at inlet
3. Repair settlement, cracking, or piping holes
4. Stabilize eroded areas at outlet — extend rip rap if necessary
SITE CONDITIONS FOR REMOVAL:
Remove as soon as alternative access is available. All foreign materials should be
removed from creek.
The streambed and banks should be returned to the original contour and should be
stabilized if necessary.
TYPICAL DETAIL: EC -10
Land disturbance Code/Best Management Practices - A 18 -
NON -SEDIMENT POLLUTION CONTROL
PHYSICAL DESCRIPTION:
Control measures designed to prohibit chemicals, hazardous materials, solid waste and
construction debris from polluting stormwater. Pollutants carried in solution or as surface
films on runoff will be carried through most erosion control and sediment capture BMP's.
Keeping substances like fuel, oil, asphalt, paint, solvents, fertilizer, soil additives,
concrete wash water, solid waste and construction debris from polluting runoff can be
accomplished to a large extent through good housekeeping on the site and following the
manufacturer's recommendations for disposal.
WHERE BMP IS TO BE INSTALLED:
Collection, storage and fueling areas should be located onsite in an area that does not
receive a substantial amount of runoff from upland areas and does not drain directly to
lakes, creeks, streams, rivers, sewers, sink holes, groundwater, wetlands, or road ditches.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Reduction in pollutants depends heavily on how construction personnel perform
their duties. An effective management system requires training and signage to
promote proper storage, handling and disposal of materials. Follow up
observations of actions and inspection of storage areas by management personnel
is also required.
2. Plans should contain notes clearly stating requirements for addressing potential
pollutants
3. Fueling areas and storage areas for hazardous materials should be protected by
berms or other means of catching leaks or spills
WHEN BMP IS TO BE INSTALLED:
Immediately following installation of construction entrance and wash station
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Place waste receptacles near area of work
2. Construct protective berm or other devices around fueling and hazardous
materials storage areas
3. Install appropriate signage
4. Post guidelines for proper handling, storage and disposal of materials, and
emergency spill cleanup on site
O&M PROCEDURES:
1. Inspect activities on regular basis
Land disturbance Code/Best Management Practices - A 19 -
2. Inspect storage areas and control devices at least every two weeks and after every
storm
3. Make necessary corrections and repairs
SITE CONDITIONS FOR REMOVAL:
Maintain practices until all construction on the site has been completed
TYPICAL DETAILS:
General pollution prevention notes attached
Land disturbance Code/Best Management Practices - A 20 -
POLLUTION PREVENTION PROCEDURES
1. HANDLING AND DISPOSAL OF HAZARDOUS MATERIALS
A. DO:
• Prevent spills
• Use products up
• Follow label directions for disposal
• Remove lids from empty bottles and cans when disposing in trash
• Recycle wastes whenever possible
B. DON'T:
• Don't pour waste into sewers or waterways on the ground
• Don't pour waste down sinks, floor drains or septic tanks
• Don't bury chemicals or containers, or dispose of them with construction
debris
• Don't burn chemicals or containers
• Don't mix chemicals together
2. Containers shall be provided for collection of all waste material including
construction debris, trash, petroleum products and any hazardous materials to be
used onsite. All waste material shall be disposed of at facilities approved for that
material.
3. No waste materials shall be buried on -site.
4. Mixing, pumping, transferring or otherwise handling construction chemicals such
as fertilizer, lime, asphalt, concrete curing compounds, and all other potentially
hazardous materials shall be performed in an area away from any watercourse,
ditch or storm drain.
5. Equipment fueling and maintenance, oil changing, etc., shall be performed only in
an area designated for that purpose. The designated area is to be equipped for
recycling oil and catching spills.
6. Concrete wash water shall not be allowed to flow directly to storm sewers,
streams, ditches, lakes, etc without being treated. A sump or pit shall be
constructed to contain concrete wash water.
7. If substances such as oil, diesel fuel, hydraulic fluid, antifreeze, etc. are spilled,
leaked, or released onto soil, the soil shall be dug up and disposed of at a licensed
sanitary landfill (not a construction/demolition debris landfill). Spills on pavement
shall be absorbed with sawdust, kitty litter or product designed for that purpose
and disposed of at a licensed sanitary landfill. Hazardous or industrial wastes such
as most solvents, gasoline, oil -based paints, and cement curing compounds
require special handling. These materials shall be removed from the site and
recycled or disposed of in accordance with MoDNR requirements.
8. State law requires the party responsible for a petroleum product spill in excess of
50 gallons to report the spill to Missouri Department of Natural Resources
(MoDNR) at (537) 634-2436, as soon as practical after discovery. Federal law
requires the responsible party to report any release of oil if it reaches or threatens
a sewer, lake, creek, stream, river, groundwater, wetland, or area (like a road
ditch) that drains into one of the above
Land disturbance Code/Best Management Practices - A 21 -
CHECK DAM
PHYSICAL DESCRIPTION:
A small dam built within a drainage swale or temporary diversion channel designed to
pond water and cause sediment to settle out. Dams can be constructed of rock, sand bags
or gravel bags.
WHERE BMP IS TO BE INSTALLED:
At intervals along drainage swales or channels. The top of the downstream check dam
should be level with the base of the upstream check dam.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Moderate concentrated flow
2. Contributing Area: Maximum of 2 acres
3. Channel Slope: Maximum of 2%
WHEN BMP IS TO BE INSTALLED:
Prior to disturbance of natural vegetation in contributing drainage area; immediately after
construction of drainage way
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade drainage way and compact area of check dam
2. Place rock, sand bags or gravel bags to required configuration perpendicular to
flow
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove trash and leaf accumulation
3. Remove sediment buildup once it reaches Y2 depth of check dam or 12" depth,
whichever is less
4. Restore dam structure to original configuration to protect banks
5. Replace rock on upstream face of dam if ponding does not drain in reasonable
timeframe
SITE CONDITIONS FOR REMOVAL:
Remove after contributing drainage areas have been adequately stabilized and vegetation
is adequately established in drainage way. Regrade and vegetate area of check dam.
TYPICAL DETAIL: RM-1
Land disturbance Code/Best Management Practices - A 22 -
DIVERSION - RIDGE & CHANNEL
PHYSICAL DESCRIPTION:
A compacted earth or gravel ridge, excavated channel or a combination of ridge and
channel designed to direct runoff away from or around disturbed areas and cause
sediment to settle out. Diversions built on a level contour are used in combination with
temporary slope drains to provide adequate conveyance. Diversions built with positive
drainage slopes release runoff into additional BMP's such as sediment traps or level
spreaders. BMP's such as check dams can also be used in diversion channels
to slow velocities.
WHERE BMP IS TO BE INSTALLED:
At top of disturbed slopes and other sensitive areas to protect them from upstream runoff,
intermediate locations along long slopes to reduce slope length, and perimeter of
construction area
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow and low -volume concentrated flows
Contributing Area: Contributing slope length — 300 feet maximum; 100 feet for slopes
greater than 5%
Channel Lining: Diversions of slopes exceeding 5% should be lined with gravel or other
material due to high velocity
WHEN BMP IS TO BE INSTALLED:
Prior to disturbance of natural vegetation on slopes and at intervals during construction of
fill slopes
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade and compact channel and/or ridge
2. Install vegetation or protective lining
3. Stabilize outfall area as depicted on plan
4. Install lathe or post at each end of diversion, and at 20 -foot intervals. Mark
maximum allowable sediment depth at %2 the depth of the channel.
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove sediment once sediment reaches 1/2 design depth, as indicated on
monitoring posts
Land disturbance Code/Best Management Practices - A 23 -
3. Remove any trash accumulation
4. Repair, revegetate or stabilize any erosion damage
SITE CONDITIONS FOR REMOVAL:
After permanent vegetation of slope is established
TYPICAL DETAIL: RM-2
Land disturbance Code/Best Management Practices - A 24 -
fl
DIVERSION - STORM SEWER
PHYSICAL DESCRIPTION:
A stabilized diversion designed to redirect the flow of a storm sewer system while work that
impacts the system is performed. Diversions can be in the form of pipes or channels, and can
handle the flows of creeks or streams or at the outlets of storm sewer pipes. Diversion channels
must be stabilized to prevent erosion. Diversions can release runoff directly into the storm sewer
system downstream or to additional BMP's such as sediment traps, sediment basins or rock
outlets. BMP's, such as check dams, can also be used in diversion channels to slow velocities.
WHERE BMP IS TO BE INSTALLED:
Around locations that impact the flow of runoff in storm sewer systems. Diversion route should
be located to minimize impact on other construction activities.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Concentrated flow
2. Capacity of diversion device: Sized for 15 year, 20 minute storm event, while minimizing
velocity of flow
WHEN BMP IS TO BE INSTALLED:
Prior to disturbance of area impacting the function of the storm sewer system
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Excavate diversion area except for area of upstream connection
2. Compact as required to place diversion properly
3. Install pipe bedding or channel lining as required
4. Install pipe and backfill to required dimensions and compaction
5. Install additional BMP's as designed — both in the diversion and downstream
6. Make final connection to upstream storm sewer system
O&M PROCEDURES:
Inspect every week and after every storm
1. Remove trash and leaves
2. Remove sediment once sediment reaches a depth of 25% of the pipe's inside diameter
3. Repair eroded areas and stabilize — a wider channel or additional stabilization may need
to be designed
SITE CONDITIONS FOR REMOVAL:
Remove after work impacting existing storm sewer has been completed and stabilized
TYPICAL DETAILS: Not Applicable
Land disturbance Code/Best Management Practices - A 25 -
GRADIENT TERRACES
PHYSICAL DESCRIPTION:
Defined swales constructed at regular intervals along the face of a slope designed to reduce
erosion by capturing surface runoff and directing it to an adequate, stable outlet. Due to the steep
slopes needed to create the terrace, swales may only be created by construction of earth ridges.
WHERE BMP IS TO BE INSTALLED:
Typically installed on long steep slopes on which erosion is a concern. Gradient terraces should
not be constructed in sandy or rocky soil.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow
2. Slope Characteristics: Maximum of 3:1 slope
3. Contributing Slope Length:
• Maximum of 30 feet for slopes steeper than 4:1
• Maximum of 50 feet for 4:1 and flatter
4. Outlet: invert outlet BMP less than or equal to HGL of terrace in 15 year 20 minute storm
WHEN BMP IS TO BE INSTALLED:
Installed as fill is constructed. On existing slopes, terraces should be graded prior to removal of
vegetation.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade terraces as required
2. Construct stable outfall as designed
3. Vegetate gradient terrace
O&M PROCEDURES:
1. Inspect every week and after every storm during construction and annually thereafter
2. Remove sediment accumulations once channel depth is reduced to 6"
3. Repair settlement and eroded areas
4. Remove sediment and stabilize eroded areas at outlet
5. Revegetate as needed
SITE CONDITIONS FOR REMOVAL: Not Applicable
TYPICAL DETAIL: RM-4
Land disturbance Code/Best Management Practices - A 26 -
fl
GRASS LINED CHANNEL
PHYSICAL DESCRIPTION:
Trapezoidal or parabolic stormwater conveyance channel lined with vegetation, designed
to direct runoff and reduce the flow velocity of concentrated runoff. Channels should
outlet into sediment traps, detention/retention basins, or other stable outlets. In areas with
seasonally high water tables or seepage problems, subsurface drains are included under
the channel. Grassed channels have a limited ability to control runoff from large storms
and are often used in combination with other BMP's, such as subsurface drains and riprap
stabilization.
WHERE BMP IS TO BE INSTALLED:
Used in areas where erosion -resistant conveyances are needed, including areas with
highly erodible soils and moderately steep channel slopes - less than 5%. Channels
should only be installed where space is available for a relatively large cross section.
Channels should not make sharp, unnatural changes in direction or grade of flow.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Concentrated flow
2. Flow Properties: Maximum velocity of 5 fps
WHEN BMP IS TO BE INSTALLED:
Immediately after clearing, prior to upstream grading activities.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Excavate and shape channel to required section
2. Install subsurface drain, if needed
3. Install erosion resistant lining, such as rip -rap or sod, at concentrated inflow
points
4. Prepare and fertilize soil
5. Install sod, seed with protection such as erosion control blankets or turf
reinforcement mats, or hydro seeding
6. Sod should be laid perpendicular to flow, with a brick -like joint pattern. Stake,
staple and/or net corners and centers of sod strips as required.
7. Install lathe or post at each end of channel, and at 20 -foot intervals. Mark
maximum allowable sediment depth at 6 inches.
8. Water immediately after installation - enough to soak 4 inches into soil without
causing runoff.
Land disturbance Code/Best Management Practices - A 27 -
O&M PROCEDURES:
1. Water sod daily for 3 weeks - enough to soak 4 inches into soil without causing
runoff
2. Inspect every week and after every storm for the duration of construction or 6
months, whichever is longer
3. Remove any blockage and or debris from channel, channel outlet or road
crossings
4. Reposition areas of sod that have moved
5. Remove sediment accumulation once sediment reaches 6" in depth, as indicated
on the monitoring posts — replace vegetation if necessary
6. Repair any eroded areas, revegetate, and stabilize as needed
7. Do not mow until 3 inches of new growth occurs. During the first 4 months, do
not mow more than 1/3 the grass height.
SITE CONDITIONS FOR REMOVAL:
Temporary channels can be removed after permanent storm sewer system is operational.
TYPICAL DETAIL: RM-5
Land disturbance Code/Best Management Practices - A 28 -
GRAVEL BAGS
PHYSICAL DESCRIPTION:
Open mesh nylon or burlap bags of gravel designed to pond water and cause sediment to settle
out.
Gravel bags can be used alone or as a part of other Best Management Practices (BMP's).
WHERE BMP IS TO BE INSTALLED:
Suitable for multiple uses including disrupting concentrated flows, redirecting concentrated
flows, capturing sediment by ponding, and anchoring other devices. Can be used in place of silt
fence, rock check dams, rock outlet protection, ridge diversions, inlet protection, and level
spreader, or as part of the structure of sediment basins, sediment traps, storm drain diversions,
and structural stabilization of streams.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow and concentrated flow
WHEN BMP IS TO BE INSTALLED:
Dependent upon function it is designed to perform.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Fill bags approximately 2/3 full
2. Grade and stabilize soil on which bags are to be placed
3. Install center line of bags on bottom row
4. Place remaining bags on each side of center — min. width of bottom row is 3 bags
5. Place upper rows of bags, staggering ends in brick -like pattern
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Replace and stabilize any damaged bags or bags that have moved out of place
3. When silt builds up in front of a row of gravel bags performing the function of silt fence,
move the row of bags in front of the sediment buildup. This "new row" will capture
additional sediment and keep concentrated flows from reaching the previous sediment
deposit.
4. Remove sediment at rows of bags used as weirs or lips. Bags may be repositioned to
facilitate removal of sediment.
SITE CONDITIONS FOR REMOVAL:
Completion of upstream work and vegetation of contributing runoff areas.
TYPICAL DETAIL: RM-6
Land disturbance Code/Best Management Practices - A 29 -
LEVEL SPREADER
PHYSICAL DESCRIPTION:
A level graded area designed to slow and spread runoff and release it as sheet flow to a stabilized
area. The level spreader outfall can be stabilized by vegetation, erosion control blankets or a
combination wood timber and gravel. Undisturbed vegetated areas with a maximum slope of 10%
at the outfall do not require stabilization.
WHERE BMP IS TO BE INSTALLED:
At downstream end of diversion devices and upstream end of filter strips
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow and concentrated flow
Contributing Area: Flow from 15 year, 20 minute storm event under 5 cfs for vegetated lip, and
up to 30 cfs for rigid lip
WHEN BMP IS TO BE INSTALLED
Immediately after rough grading - concurrent with diversion devices prior to completion of filter
strips downstream
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Excavate to length, width, depth and slopes specified on plan
2. For rigid lip, excavate and stabilize a level area for timber and gravel. Fill remaining
excavated area behind timber with gravel.
3. Seed and net or hydro seed "channel" area of spreader.
4. For vegetated lip, staple erosion control blanket to protect lip
5. Stabilize outfall area as depicted on plan
6. Install lathe or post at each end and center of spreader. Mark maximum allowable
sediment depth at '/2 the depth of the spreader.
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove sediment accumulations once sediment reaches 1/2 design depth, as indicated on
monitoring posts
3. Repair and revegetate any erosion damage in spreader "channel" or downstream of lip
SITE CONDITIONS FOR REMOVAL:
Remove after upstream areas are stabilized with vegetation, subsequent to removal of diversion
devices.
TYPICAL DETAIL: RM-7
Land disturbance Code/Best Management Practices - A 30 -
SURFACE ROUGHENING
PHYSICAL DESCRIPTION:
Continuous horizontal grooves on the surface of slopes designed to reduce runoff velocity,
increase infiltration, reduce erosion and trap sediment. Roughening can also be used when other
methods of erosion/siltation control are not immediately available. In this case, surface
roughening should be supplemented with other BMP's as soon as possible.
WHERE BMP IS TO BE INSTALLED:
At the top of, and at intermediate points along, disturbed slopes to disrupt low -volume,
concentrated flows, and/or at the base of disturbed slopes to slow water runoff and capture
sediment laden runoff
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow
2. Contributing Area:
• Unlimited on slopes < 10%
• Slopes > 10% require additional BMP's (such as diversion channel)
WHEN BMP IS TO BE INSTALLED:
Immediately after rough grading; prior to seeding or mulching.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Using lightweight machinery, such as tractors with a harrow, disk or box grader
attachment, drag surface to create series of grooves and ridges perpendicular to water
flow.
2. Lightweight, track driven equipment, such as a skid -steer, can be used to create the
grooves; however, travel direction up and down the slope is required.
O&M PROCEDURES:
1. Inspect every week and immediately after storms
2. Rework the slope and regroove after sediment buildup is deeper than %2 the groove depth
3. Rework the slope and regroove if rills have cut across the roughened surface
SITE CONDITIONS FOR REMOVAL:
The slope should be reworked to the design grades immediately prior to final stabilization. In
some cases, such as seeding the area, the roughened area could be left as is.
TYPICAL DETAILS: RM-8
Land disturbance Code/Best Management Practices - A 31 -
TEMPORARY SLOPE DRAIN
PHYSICAL DESCRIPTION:
A flexible tubing or rigid conduit extending from the top to the bottom of a cut or fill
slope designed to protect exposed slopes from upstream runoff. Slope drains typically
extend beyond the toe of slope to a stable area or outlet.
WHERE BMP IS TO BE INSTALLED:
Typically installed on long slopes where runoff cannot easily be directed to the ends of a
section of cut or fill.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow and concentrated flow
2. Contributing Area: Maximum 5 acres per slope drain; pipe sized for 15 year, 20
minute storm event
WHEN BMP IS TO BE INSTALLED:
Concurrently with diversion devices and at the end of each work day for slopes 10 feet or
more in height
INSTALLATION/CONSTRUCTION PROCEDURES:
Temporary slope drains must be installed and maintained properly because failure will
usually result in severe erosion of the slope. Other points of concern are failure from
overtopping due to inadequate pipe inlet capacity or blockage, and lack of maintenance of
the upstream diversion device capacity.
1. Install slope drain down the slope, extending beyond toe of slope
2. Install flared end or t -section at pipe inlet. Section should be well entrenched and
stable so water can enter freely.
3. Compact fill over and around pipe in area of diversion device
4. Ensure that all pipe connections are secure and watertight
5. Securely anchor the exposed section of the drain with stakes
6. Install flared end section at pipe outlet — discharge into a sediment trap or other
stabilized outlet
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove sediment and trash accumulation at inlet
3. Repair settlement, cracking, or piping holes
Land disturbance Code/Best Management Practices - A 32 -
4. Repair leaks or inadequate anchoring along pipe
5. Remove sediment and stabilize eroded areas at outlet — extend if necessary
SITE CONDITIONS FOR REMOVAL:
Remove concurrently with upstream diversion device, immediately prior to permanent
vegetation of slope
TYPICAL DETAIL: RM-9
Land disturbance Code/Best Management Practices - A 33 -
FILTER STRIP
PHYSICAL DESCRIPTION:
A wide belt of vegetation running along a contour designed to provide infiltration,
intercept sediment and other pollutants, and reduce stormwater flow and velocity.
Vegetation may be in the form of natural wooded strip or proposed mix of erosion
resistant plants that form a dense mat and effectively bind the soil.
WHERE BMP IS TO BE INSTALLED:
Adjacent to low or medium density residential areas on gently sloping ground (less than
15%).
CONDITIONS FOR EFFECTIVE USE OF I3MP:
1. Type of Flow: Overland sheet flow only — cannot treat high velocity flows
2. Contributing Area: Maximum of 5 acres, with less than 15% slope
WHEN BMP IS TO BE INSTALLED:
Immediately after rough grading to trap sediment during construction and or immediately
after final grading as a permanent measure to control surface runoff.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Fence off any undisturbed wooded strips to be preserved. No activity, including
parking vehicles or equipment and storing clearing, grubbing or construction
debris, shall be permitted in the wooded strip. If a grass filter strip is constructed,
it must be completed and vegetated before construction in the impervious area is
started.
2. Clear and grub the filter strip area
3. If the adjacent area does not have a level edge, install a level spreader to distribute
runoff evenly.
See Level Spreader BMP for information.
4. Fertilize and vegetate strip with erosion resistant plants that form a dense mat and
effectively bind the soil (e.g., crown vetch, sod, or seed and mulch).
O&M PROCEDURES:
1. Inspect every week and after every storm during construction, and annually
thereafter.
2. Fill and compact eroded areas and reseed, mulch and fertilize or establish other
vegetation in the affected areas.
Land disturbance Code/Best Management Practices - A 34 -
3. After improvements are complete, regrade and reseed the top edge of the filter
strip to remove sediment trapped during construction and prolong the effective
use of the filter strip.
4. Apply a complete fertilizer annually until the desired density of vegetation is
obtained. Thereafter, apply fertilizer in accordance with the soil test
recommendations.
5. Protect new plantings from wildlife.
6. Mow grass strips to a height of 6 to 12 inches two to three times a year to
suppress weeds and woody vegetation unless natural, woody vegetation is
planned.
7. Repair footpaths and traffic ruts.
SITE CONDITIONS FOR REMOVAL: Not Applicable
TYPICAL DETAIL: SC -1
Land disturbance Code/Best Management Practices - A 35 -
INLET PROTECTION - BLOCK & GRAVEL
PHYSICAL DESCRIPTION:
A temporary sediment control barrier consisting of a short concrete block wall supporting gravel
filter media around a grated inlet designed to prevent sediment from entering the storm sewer.
Shallow temporary ponding during and after rainfall should be expected.
WHERE BMP IS TO BE INSTALLED:
At inlets where heavy flows are expected and an overflow capacity is necessary to prevent
excessive ponding around the structure.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow and concentrated flow
Contributing Area: Maximum of 1 acre
WHEN BMP IS TO BE INSTALLED:
Immediately after placement of inlet.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Backfill, compact and uniformly grade area around inlet
2. Install first row of concrete blocks adjacent to the inlet sill, placing one block on its side
on each side of inlet. The blocks are placed against the sill for lateral support and to avoid
washouts when overflows occur.
3. If needed for lateral support, install 2 x 4 lumber through vertical block openings
4. Fill vertical block openings with gravel for stability
5. Place second row of block offsetting one-half block from the first row, in a brick -like
pattern
6. Fill vertical block openings with gravel
7. Anchor wire screen over horizontal block openings to support gravel
8. Place gravel around the blocks
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove sediment accumulation to keep it at least 8 inches from the top of the blocks
3. Remove trash accumulation at inlet
4. Repair elements to original configuration as needed
SITE CONDITIONS FOR REMOVAL:
Remove after contributing drainage areas have been adequately stabilized. Restore area to grade
and vegetate.
TYPICAL DETAIL: SC -2
Land disturbance Code/Best Management Practices - A 36 -
INLET PROTECTION - FABRIC DROP
PHYSICAL DESCRIPTION:
A woven fabric barrier braced around an area inlet designed to prevent sediment from
entering the storm sewer. Shallow temporary ponding during and after rainfall should be
expected.
WHERE BMP IS TO BE INSTALLED:
At inlets designed to drain a small gently sloping area with maximum grade of 5%.
Overflow capacity is limited on standard area inlets.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Shallow sheet flow
2. Contributing Area: Maximum of 2 cfs flowing to inlet
WHEN BMP IS TO BE INSTALLED:
Immediately after placement of inlet.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Backfill, compact and uniformly grade area around inlet
2. Construct downstream berm, if required. Rock bags or sand bags may be used to
construct berm.
3. Drive posts or wood frame close to inlet sill so overflow will fall directly on the
structure and not on unprotected soil
4. Dig trench around inlet for fabric to be buried
5. Cut required length of fabric from one roll to eliminate joints. Fasten fabric tightly
around posts/frame to enhance stability.
6. Backfill and compact trench.
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove trash accumulation and sediment once it reaches depth of 6" at inlet.
3. Replace loose, torn or clogged fabric
4. Repair any erosion or settlement of temporary berm downstream of inlet
SITE CONDITIONS FOR REMOVAL:
Remove after contributing drainage areas have been adequately stabilized. Restore area to
grade and vegetate.
TYPICAL DETAIL: SC -3
Land disturbance Code/Best Management Practices - A 37 -
INLET PROTECTION - SOD FILTER
PHYSICAL DESCRIPTION:
A sod barrier installed around an area inlet after the surrounding area has been stabilized. It is
designed to slow runoff velocities and remove sediments and other pollutants from the runoff.
This final inlet protection measure is an aesthetically pleasing way to treat stormwater.
WHERE BMP IS TO BE INSTALLED:
Around the perimeter of an area inlet
CONDITIONS FOR EFFECTIVE USE OF BMP:
Type of Flow: Sheet flow and concentrated flow with velocities less than 5 fps
WHEN BMP IS TO BE INSTALLED:
Near end of construction, after the contributing watershed is stabilized with vegetation.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Prepare and fertilize soil
2. Lay first row of sod adjacent to inlet perpendicular to the direction of flow. Butt
subsequent rows tight against previous rows with strips staggered in brick -like pattern for
a distance of at least 4 feet in each direction. Fill minor gaps with good soil and roll entire
surface to ensure surface contact.
3. Stake, staple and/or net corners and centers of sod strips as required.
4. Water immediately after installation - enough to soak 4 inches into soil without causing
runoff.
O&M PROCEDURES:
1. Water sod daily for 3 weeks - enough to soak 4 inches into soil without causing runoff
2. Inspect sod every week and after every storm
3. Reposition areas of sod that have moved
4. Remove sediment accumulation on sod once it extends within 18" of inlet — replace sod if
necessary
5. Repair any eroded areas, replace sod, and stabilize as needed
6. Do not mow until 3 inches of new growth occurs. During the first 4 months, do not mow
more than 1/3 the grass height.
SITE CONDITIONS FOR REMOVAL: Not Applicable
TYPICAL DETAIL: SC -5
Land disturbance Code/Best Management Practices - A 38 -
fl
SEDIMENT BASIN
PHYSICAL DESCRIPTION:
A temporary settling pond designed to slowly release runoff, detaining it long enough to
allow most of the sediment to settle out. Sediment basins cannot trap all sediment that
enters. Basins should be used in conjunction with additional BMP's, such as temporary
seeding, to reduce the total amount of sediment washing into them. Sediment basins may
also be designed to be converted to permanent storm water detention basins after site
construction has been completed.
WHERE BMP IS TO BE INSTALLED:
Should be located as close to the sediment source as possible. A sediment basin should
not be used in areas of continuously running water (live streams) nor areas where failure
of the embankment will result in loss of life, damage to homes or structures, or prevent
the use of roadways or utilities.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow and concentrated flow
2. Contributing Area: Maximum 10 acres, as secondary or tertiary BMP
3. Basin Volume: Volume of 2 year, 24 hour storm event plus silt load of 1800 cf
per acre below top of riser
4. Volume Ratio: Minimum of 25:1
5. Length to Width Ratio: Minimum of 5:1; can be reduced with use of flocculants
6. Runoff Entry: Maximize distance from outlet to provide maximum retention time;
minimum of 20 feet
If needed, install porous baffles to partition the basin into 2-3 cells and increase
travel distance
7. Outlet Pipe: Sized for 2 year, 24 hour storm event
WHEN BMP IS TO BE INSTALLED:
Prior to disturbance of natural vegetation.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Excavate to length, width, depth and slopes specified on plan
2. Place and compact fill to construct dam to elevation at least 1 foot avove crown of
outlet pipe
3. Install outlet pipe and compact clayey soil around pipe using hand tampers
4. Install the perforated riser pipe, wrap with fabric, and surround with uniformly
graded gravel
5. Install BMP at downstream end of outlet pipe
Land disturbance Code/Best Management Practices - A 39 -
6. Complete installation of dam to an elevation 10% above design height to allow
for settling
7. Grade and stabilize spillway
8. Install lathe or post near outlet of basin. Mark maximum allowable sediment
depth as designed.
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove trash accumulation at outlet
3. Remove sediment accumulations once sediment reaches design depth, as
indicated on monitoring posts
4. Repair and revegetate any erosion damage on spillway
5. Repair settlement, cracking, piping holes, seepage at embankment
6. Replace gravel around riser if basin does not drain properly
SITE CONDITIONS FOR REMOVAL:
Remove after upstream areas are stabilized with vegetation. Regrade as appropriate and
vegetate immediately.
TYPICAL DETAIL: SC -6
Land disturbance Code/Best Management Practices - A 40 -
SEDIMENT TRAP
PHYSICAL DESCRIPTION:
A temporary small area of impoundment designed to trap water and allow sediment to
settle out. A trap usually consists of an excavated area with a dewatering pipe and
spillway outlet stabilized with fabric and riprap. Due to short retention periods, sediment
traps do not typically remove fine particles such as silts and clays.
WHERE BMP IS TO BE INSTALLED:
Commonly used at the outlets of BMP's such as storm water diversion devices, channels,
temporary slope drains, construction entrances, vehicle wash areas.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow and concentrated flow
2. Contributing Area: Maximum 5 acres,
3. Basin Volume: Silt load of 1800 cf per acre
4. Length to Width Ratio: 5:1 min.; can be reduced with use of flocculants
WHEN BMP IS TO BE INSTALLED:
Prior to disturbance of natural vegetation
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Excavate to length, width, depth and slopes specified on plan
2. Install dewatering pipe
3. Place and compact fill to construct embankment and spillway
4. Place fabric over dewatering pipe and embankment
5. Install rip -rap on embankment and gravel over dewatering pipe
6. Install lathe or post at each end of basin, and at 20 -foot intervals. Mark maximum
allowable sediment depth as designed.
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove trash accumulation
3. Remove sediment accumulations once sediment reaches design depth, as
indicated on monitoring posts
4. Repair and revegetate any erosion damage
5. Repair settlement, cracking, piping holes, or seepage at embankment
Land disturbance Code/Best Management Practices - A 41 -
SITE CONDITIONS FOR REMOVAL:
Remove after upstream areas are stabilized with vegetation. Regrade as appropriate and
vegetate immediately.
TYPICAL DETAILS: SC -7.1 Sediment Trap: for use in open areas
SC -7.2 Sediment Trap — Single Cell: for use in line with swales and/or channels
SC -7.3 Sediment Trap — Double Cell: for use in line with swales and/or channels
Land disturbance Code/Best Management Practices - A 42 -
SILT FENCE
PHYSICAL DESCRIPTION:
A fence constructed of woven filter fabric and wire mesh stretched between posts and
entrenched in the ground designed to pond stormwater runoff and cause sediment to settle
out.
WHERE BMP IS TO BE INSTALLED:
Installed along slopes, at base of slopes, and around perimeter of site as final barrier to
sediment being carried off site. Spacing of fence along slopes is relative to slope.
CONDITIONS FOR EFFECTIVE USE OF BMP:
1. Type of Flow: Sheet flow only
2. Contributing Slope Length:
• 30 foot maximum for 3:1 slopes
• 50 foot maximum for slopes between 3:1 and 10:1
• 100 foot maximum for slopes under 10%.
WHEN BMP IS TO BE INSTALLED:
Prior to disturbance of natural vegetation and at intervals during construction of fill
slopes
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Drive post for fence line
2. Dig trench to required dimensions in front of posts for fabric burial
3. Attach wire mesh to posts
4. Attach fabric to posts, allowing required length below ground level to run fabric
along bottom of trench
5. Backfill and compact soil in trench to protect and anchor fabric
Alternate Construction: Install fence by slicing it into ground with specialized equipment
Install posts at reduced spacing indicated on detail
O&M PROCEDURES:
1. Inspect every week and after every storm
2. Remove sediment buildup deeper than `/2 the fence height or 12", whichever is
less
3. Replace torn or clogged fabric; repair loose fabric
4. Repair unstable or broken posts
Land disturbance Code/Best Management Practices - A 43 -
5. Stabilize any areas susceptible to undermining
6. Extend fence or add additional row(s) of fence if necessary to provide adequate
protection
SITE CONDITIONS FOR REMOVAL:
After permanent vegetation of slope is established. Remove fence, regrade trench area
and vegetate.
TYPICAL DETAIL: SC -8
Land disturbance Code/Best Management Practices - A 44 -
CONSTRUCTION ENTRANCE
PHYSICAL DESCRIPTION:
A stabilized entrance to a construction site designed to minimize the amount of sediment tracked
from the site on vehicles and equipment. Stabilization generally consists of aggregate over fabric.
Mud and sediment fall off of tires as they travel along the stabilized entrance; however, additional
measures in the form of a washdown area should also be included on site. The stabilized entrance
also distributes the axle load of vehicles over a larger area; thereby mitigating the rutting impact
vehicles normally have
on unpaved areas.
WHERE BMP IS TO BE INSTALLED:
At locations where it is safe for construction vehicles and equipment to access existing streets —
preferably at location of future streets or drives.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Drainage: Ditches or pipes, if needed, sized for 15 year, 20 minute storm; HGL 6" below surface
of entrance
WHEN BMP IS TO BE INSTALLED:
First order of work, along with washdown area, prior to vehicles or equipment accessing unpaved
areas.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade and compact area of construction entrance
2. Install culvert under entrance if needed to maintain positive drainage
3. Place fabric and cover with aggregate, forming diversion across entrance if needed to
direct runoff away from roadway
4. See Washdown Station BMP for additional steps
O&M PROCEDURES:
1. Immediately remove any mud or debris tracked onto paved surfaces
2. Remove sediment and clods of dirt from construction entrance continuously
3. Replace rock if necessary to maintain clean surface
4. Repair settled areas
SITE CONDITIONS FOR REMOVAL:
Remove when vehicles and equipment will no longer access unpaved areas
TYPICAL DETAIL: TC- 1
Land disturbance Code/Best Management Practices - A 45 -
CONSTRUCTION ROAD
PHYSICAL DESCRIPTION:
A stabilized pathway providing vehicular access to a remote construction area designed
to reduce rutting, tracking of mud in wet weather, and creation of dust in dry weather.
The "roadway" can be constructed of aggregate over fabric, asphaltic concrete or
portland cement concrete based on the longevity of the project, required performance,
and site conditions. Roadways should follow the natural terrain to the extent possible.
WHERE BMP IS TO BE INSTALLED:
On long travel paths on unpaved areas, adjacent to bodies of water, and in areas where
poor soil is encountered.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Drainage: Road ditches or pipes, if needed, sized for 15 year, 20 minute storm event;
HGL 6" below surface of road.
WHEN BMP IS TO BE INSTALLED:
First order of work, prior to vehicles or equipment accessing remote areas.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade and compact area of construction road and if needed, adjacent road ditches
2. Install culvert under road if needed to maintain positive drainage
3. Place and compact roadway materials
4. Vegetate road ditches
O&M PROCEDURES:
1. Remove sediment and clods of dirt from road daily
2. Repair settled areas
3. Replace rock if necessary to maintain clean surface
4. Remove sediment from road ditch once it is within 6" of top of road surface
SITE CONDITIONS FOR REMOVAL:
Remove when vehicles and equipment will no longer access remote areas; regrade area
and vegetate.
TYPICAL DETAIL: TC-3
Land disturbance Code/Best Management Practices - A 46 -
WASHDOWN STATION
PHYSICAL DESCRIPTION:
An area located at construction entrances designed to wash sediment from the tires and
undercarriage of exiting vehicles and prevent sediment from being tracked onto existing
roadways.
WHERE BMP IS TO BE INSTALLED:
Across or immediately adjacent to exit paths from unpaved construction sites.
CONDITIONS FOR EFFECTIVE USE OF BMP:
Drainage: Downstream BMP sized to treat dirty runoff from washdown station
WHEN BMP IS TO BE INSTALLED:
First order of work, along with construction entrance, prior to vehicles or equipment
accessing unpaved areas.
INSTALLATION/CONSTRUCTION PROCEDURES:
1. Grade and compact area for drainage under washdown pad
2. Install steel -ribbed plate on frame or other support to allow a 2" drain space
3. Grade and vegetate downstream BMP (v -ditch shown on detail)
4. Install water supply and hose
5. Post sign in advance of station indicating that all exiting vehicles and equipment
must use station prior to exiting site
O&M PROCEDURES:
1. Remove sediment daily
2. Repair settled areas
3. Replace rock if necessary to maintain clean surface
SITE CONDITIONS FOR REMOVAL:
Remove when vehicles and equipment will no longer access unpaved areas
TYPICAL DETAIL: TC-4
Land disturbance Code/Best Management Practices - A 47 -