HomeMy WebLinkAbout2015-05-26 - AGENDA REPORTS - LOW IMPACT DEVELOPEMENT ORD (2)0
Agenda Item: 3
CITY OF SANTA CLARITA
'~ AGENDA REPORT
CONSENT CALENDAR
CITY MANAGER APPROVAL:
DATE: May 26, 2015
SUBJECT: SECOND READING AND ADOPTION OF THE LOW IMPACT
DEVELOPMENT (LID) ORDINANCE
DEPARTMENT: Public Works
PRESENTER: Travis Lange
RECOMMENDED ACTION
City Council conduct a second reading and adopt an ordinance entitled, "AN ORDINANCE OF
THE CITY COUNCIL OF THE CITY OF SANTA CLARITA, CALIFORNIA, AMENDING
THE CITY OF SANTA CLARITA MUNICIPAL, CODE CHAPTER 1795 STANDARD
URBAN STORMWATER MITIGATION PLAN IMPLEMENTATION BY
INCORPORATING LOW IMPACT DEVELOPMENT (LID) STRATEGIES ON CERTAIN
DEVELOPMENT PROJECTS."
BACKGROUND
On May 12, 2015, the City Council held a Public Hearing and the first reading of this ordinance.
Provision of the Municipal Stormwater Permit
In late 2012, the State -issued Municipal Stormwater National Pollutant Discharge Elimination
System Permit (Permit) became effective. The Current version of the Permit contains new
requirements related to management of surface water quality that affects the City of Santa Clarita
(City).
The Permit contains provisions requiring specific development projects to implement Low
Impact Development (LID) practices to infiltrate and/or retain and re -use runoff water from
precipitation onsite. This ordinance will revise the City's current State -required Standard Urban
Stormwater Mitigation Plan (SUSMP) ordinance by requiring specific new development and
redevelopment projects to incorporate LID practices into the design of the project. The main
purpose of LID is to capture and reduce pollution entering storm drains and affecting local
waterways, but includes other benefits, such as enhancing local aquifers and increasing pervious
surfaces.
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Projects Affected
Development projects that will be required to form a SUSMP and incorporate LID are similar to
the projects listed in the previous Permit. The development projects that will be required to
implement LID are as follows:
I . All projects greater than one acre of disturbed area and add more than 10,000 square feet of
impervious surface area.
2. Industrial parks with 10,000 square feet or more of surface area.
3. Commercial malls with 10,000 square feet or more of surface area.
4. Retail gasoline outlets with 5,000 square feet or more of surface area.
5. Restaurants with 5,000 square feet or more of surface area.
6. Parking lots with 5,000 square feet or more of impervious surface area, or with 25 or more
parking spaces.
7. Street and road construction of 10,000 square feet or more of impervious surface area.
8. Automotive service facilities with 5,000 square feet or more of surface area.
9. Projects located in, or directly adjacent to, or discharging directly to a Significant Ecological
Area (SEA), where the development will:
a. Discharge stormwater runoff that is likely to impact a sensitive biological species or
habitat; and
b. Create 2,500 square feet or more of impervious surface area.
10. Single-family homes on a graded hillside.
11. Redevelopment of the projects listed above that disturb land and result in the creation,
addition, or replacement of 5,000 square feet or more of impervious surface area on an
already developed site:
a. Where redevelopment results in an alteration to more than 50 percent of impervious
surfaces of a previously existing development, and the existing development was not
subject to post -construction stormwater quality control requirements, the entire
project must be mitigated.
b. Where redevelopment results in an alteration of less than 50 percent of impervious
surfaces of a previously existing development, and the existing development was not
subject to post -construction stormwater quality control requirements, only the
alteration must be mitigated and not the entire development.
c. Redevelopment does not include routine maintenance activities that are conducted to
maintain original line and grade, hydraulic capacity, original purpose of facility or
emergency redevelopment activity required to protect public health and safety.
Impervious surface replacement, such as the reconstruction of parking lots and
roadways, which does not disturb additional area and maintains the original grade and
alignment, is considered a routine maintenance activity. Redevelopment does not
include the repaving of existing roads to maintain original line and grade.
d. Existing single-family dwelling and accessory structures are exempt from the
redevelopment requirements unless such projects create, add, or replace 10,000
square feet of impervious surface area.
Requirements
The LID measures under the proposed ordinance require the development projects to be designed
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to capture pollutants, limit pollutant loads, and reduce runoff volume to the 85th percentile of a
24-hour storm by minimizing impervious surface areas and controlling runoff through:
1. Infiltration (entry of water into the surface of the soil).
2. Bioretention (reducing stormwater runoff by intercepting rainfall with vegetation,
evapotranspiration, and infiltration).
3. Rainfall harvest and use (capturing runoff to provide temporary storage until the harvested
water can be used for irrigation).
The "85th percentile, 24-hour event" is an engineering term that represents the precipitation
quantity in a 24-hour period not exceeded in 85 percent of all events. For Santa Clarita, the 85th
percentile is approximately 1.00 inch. For parking lot on a one -acre parcel, which is mostly
impervious surface with heavy stormwater runoff, the developer would need to infiltrate 22,809
gallons of water, which is essentially the size of a large swimming pool. Conversely, for a one -
acre grassy park with little impervious surface area and little runoff, the developer would need to
infiltrate 3,258 gallons of water, which is the size of a typical spa.
Development Process
As part of the City's development review process, discretionary projects are reviewed and
conditioned. Written conditions for development will be provided to the owner, developer, .
engineer, etc., and if the project falls under the list of applicable developments, an Urban
Stormwater Mitigation Plan (USMP) incorporating LID standards will be a condition of
development. The applicant will be required to prepare and submit a USMP for review and
approval by the City to ensure LID requirements are implemented and comply with the
requirements prescribed in the State -issued Permit.
This ordinance shall be in effect on January 1, 2016, and apply only to the specified new
development or redevelopment projects listed previously.
Environmental
The proposed ordinance is exempt from the California Environmental Quality Act (CEQA)
under Article 19, Categorical Exemptions, Section 15308, Class 8. A Class 8 exemption consists
of actions taken by regulatory agencies, as authorized by state or local ordinance, to assure the
maintenance, restoration, enhancement, or protection of the environment where the regulatory
process involves procedures for protection of the environment. If approved by City Council, a
Notice of Exemption will be filed with the Los Angeles County Clerk.
ALTERNATIVE ACTION
Other actions, as determined by the City Council
FISCAL IMPACT
Undetermined effect on the General Fund for future capital improvement projects to implement
LID principles into specified projects including new Green Streets requirements.
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ATTACHMENTS
Low Impact Development (LID) Ordinance
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ORDINANCE NO. 15 -
AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF
SANTA CLARITA, CALIFORNIA, AMENDING THE CITY OF SANTA CLARITA
MUNICIPAL CODE CHAPTER 17.95 STANDARD URBAN STORMWATER MITIGATION
PLAN IMPLEMENTATION BY INCORPORATING LOW IMPACT DEVELOPMENT (LID)
STRATEGIES ON CERTAIN DEVELOPMENT PROJECTS
WHEREAS, the State of California (State) requires by its Government Code that local
jurisdictions adopt the latest State Building Standards Code; and
WHEREAS, the City is authorized by Article XI, Section 5 and Section 7, of the State
Constitution to exercise the police power of the State by adopting regulations to promote public
health, public safety, and general prosperity; and
WHEREAS, the federal Clean Water Act establishes Regional Water Quality Control
Boards to prohibit the discharge of pollutants in stormwater runoff to waters of the United States;
and
WHEREAS, the City is a permittee under the California Regional Water Quality Control
Board --Los Angeles Region (Regional Board), Order No. R4-2012-0175, issued on November 8,
2012, which establishes Waste Discharge Requirements for Municipal Separate Storm Sewer
Systems (MS4) Discharges within the Coastal Watersheds of Los Angeles County, except those
discharges originating from the City of Long Beach MS4; and
WHEREAS, Order No. R4-2012-0175 contains requirements for municipalities to
establish a LID Ordinance to participate in a Watershed Management Program and/or
Enhanced Watershed Management Program; and
WHEREAS, the Regional Board has adopted Total Maximum Daily Loads (TMDLs) for
pollutants, which are numerical limits that must be achieved effectively through LID
implementation; and
WHEREAS; the City has the authority under the California Water Code to adopt and
enforce ordinances imposing conditions, restrictions, and limitations with respect to any activity
that might degrade waters of the State; and
WHEREAS, the City is committed to a stormwater management program that protects
water quality and water supply by employing watershed -based approaches that balance
environmental and economic considerations; and
WHEREAS, urbanization has led to increased impervious surface areas resulting in
increased water runoff and less percolation to groundwater aquifers, causing the transport of
Pollutants to downstream receiving waters; and
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WHEREAS, it is the intent of the City to expand the applicability of the existing LID
requirements by providing stormwater and rainwater LID strategies for all prgjects for
development and redevelopment as defined under "Applicability."
NOW THEREFORE, THE CITY COUNCIL OF THE CITY OF SANTA CLARITA,
CALIFORNIA, DOES HEREBY ORDAIN AS FOLLOWS:
SECTION 1. Chapter 17.95 of the Santa Clarita Municipal Code shall be amended in
its entirety to read as follows:
Sections:
17.95.010
Purpose of Chapter.
1795.020
Scope and Applicability.
17.95.030
Definitions.
17.95.040
Rate of Discharge.
17.95.050
Subdivision Design.
17.95.060
Best Management Practices (BMPs).
17.95.070
Control of Erosion of Slopes and Channels.
17.95.080
Signage of Storm Drains.
17.95.090
Outdoor Storage of Materials.
17.95.100
Outdoor Trash Storage Areas.
17.95.1 10
Maintenance of Best Management Practices.
17.95.120
Design Standards for Stormwater Pollution Control Requirements.
17.95.190
Violations.
17.95.200
Inspections.
17.95.210
Fees.
17.95.220
Alternative Compliance.
17.95.010 Purpose of Chapter.
The provisions of this chapter contain requirements for post -construction stormwater activities
and facility operations of development and redevelopment projects to comply with the current
"Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4)" issued by
the California Regional Water Quality Control Board --Los Angeles Region (Order No. R4-2012-
0175), which also serves as a National Pollutant Discharge Elimination System (NPDES) Permit
under the Federal Clean Water Act (NPDES No. CAS004001), and Waste Discharge
Requirements under California law (the "Municipal NPDES permit'), lessen the water quality
impacts of development by using smart growth practices, and integrate low -impact development
(LID) design principles to mimic predevelopment hydrology through infiltration,
evapotranspiration and rainfall harvest, and use. LID shall be inclusive of previously adopted
Standard Urban Stormwater Mitigation Plan (SUSMP) requirements.
Nothing in this chapter shall be interpreted to:
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A. Infringe any right or power guaranteed by the California Constitution, including any vested
property right; or
B. Require any action inconsistent with any applicable and lawfully adopted general plan,
specific plan, plan amendment, or building code that conforms to the laws of California and
the requirements of this chapter; or
C. Restrict otherwise lawful land -use except as authorized by the laws of California, subject to
the limitations of this chapter.
17.95.020 Scope and Applicability.
Scope: This Section contains requirements for stormwater pollution control measures in
development and redevelopment Planning Priority Projects and authorizes the City of Santa p
Clarita (City) to further define and adopt stormwater pollution control measures, to develop LID 0
principles and requirements, including but not limited to the objectives and specifications for
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integration of LID strategies, and to grant alternate compliance as allowed by the Municipal w
NPDES permit and collect fees from projects granted exceptions. Except as otherwise provided
herein, the City shall administer, implement, and enforce the provisions of this Section. z
Guidance documents supporting implementation of requirements in this Ordinance are hereby U
incorporated by reference, including SUSMP and the Los Angeles County Low Impact uwi
Development Standards Manual, and all future amendments.
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Applicability:
A. All development projects equal to one acre or greater of disturbed area that adds more than
10,000 square feet of impervious surface area.
B. Single-family hillside homes.
C. Industrial parks with 10,000 square feet or more of surface area.
D. Commercial malls with 10.000 square feet or more of surface area.
E. Automotive service facilities (Standard Industrial Classification (SIC) of 5013, 5014, 5511,
5541, 7532-7534 and 7536-7539) with 5,000 square feet or more of surface area.
F. Retail gasoline outlets with 5;000 square feet or more of surface area.
G. Restaurants (Standard Industrial Classification (SIC) of 58 12) with 5,000 square feet or more
of surface area.
H. Parking lots with 5,000 square feet or more of impervious surface area or with 25 or more J
parking spaces c
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I. Street and road construction of 10,000 square feet or more of impervious surface area.
J. Projects located in or directly adjacent to, or discharging directly to a Significant Ecological
Area (SEA), where the development will:
1. Discharge stormwater runoff that is likely to impact a sensitive biological species or
habitat; and
2. Create 2,500 square feet or more of impervious surface area.
K. Redevelopment Projects
1. Land disturbing activity that results in the creation, addition, or replacement of 5,000
square feet or more of impervious surface area on an already developed site on
Planning Priority Project categories.
2. Where redevelopment results in an alteration to more than 50 percent of impervious
surfaces of a previously existing development, and the existing development was not
subject to post -construction stormwater quality control requirements, the entire
project must be mitigated.
3. Where redevelopment results in an alteration of less than 50 percent of impervious
surfaces of a previously existing development, and the existing development was not
subject to post -construction stormwater quality control requirements, only the
alteration must be mitigated, and not the entire development.
4. Redevelopment does not include routine maintenance activities that are conducted to
maintain original line and grade, hydraulic capacity, original purpose of facility or
emergency redevelopment activity required to protect public health and safety.
Impervious surface replacement, such as the reconstruction of parking lots and
roadways which does not disturb additional area and maintains the original grade and
alignment, is considered a routine maintenance activity. Redevelopment does not
include the repaving of existing roads to maintain original line and grade.
5. Existing single-family dwelling and accessory structures are exempt from the
redevelopment requirements unless such projects create, add, or replace 10,000
square feet of impervious surface area.
Eftective date: This chapter shall take effect on January 1, 2016, and shall apply only to approval
of discretionary (within the meaning of the California Environmental Quality Act, Public
Resources Code Section 21000 et seq.) new development or redevelopment Planning Priority
Projects (as those terms are defined this chapter).
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17.95.030 Definitions.
For the purposes of this chapter, the following words and phrases shall have the meanings
respectively ascribed to them by this chapter, unless clearly inapplicable. Words and phrases not
ascribed a meaning by this chapter shall have the meanings ascribed by the "Waste Discharge
Requirements for Municipal Separate Storm Sewer System (MSA) Discharges within the Coastal i
Watersheds of Los Angeles County, Except those Discharges Originating from the City of Long i
Beach MS4," issued by the California Regional Water Quality Control Board --Los Angeles F
Region, (Order No. R4-2012-0175), or as modified by the State Water Resources Control Board, ;
if defined therein, and if not, by the regulations implementing Clean Water Act Section 402 and
Division 7 of the California Water Code, as they may be amended from time to time, if defined
therein, and if not, to the definitions in an applicable permit issued by the California Regional
Water Quality Control Board --Los Angeles (Regional Board), as such permits may be amended
from time to time.. G
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Automotive Service Facility means a facility that is categorized in any one of the following t
Standard Industrial Classification (SIC) and North American Industry Classification System
(NAILS) codes. For inspection purposes, permittees need not inspect facilities with SIC codes
5013, 5014, 5541, and 5511, provided these facilities have no outside activities or materials that a
may be exposed to stormwater. (Source: Order No. R4-2012-0175)
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Basin Plan means the Water Quality Control Plan, Los Angeles Region, Basin Plan for the u
Coastal Watersheds of Los Angeles and Ventura Counties, adopted by the Regional Water Board
on June 13, 1994, and subsequent amendments. (Source: Order No. R4-2012-0175)
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Best Management Practice (BMP) means any practices or physical devices or systems
designed to prevent or reduce pollutant loading from stormwater or non-stormwater discharges to u
receiving waters, or designed to reduce the volume of stormwater or non-stormwater discharged .2
to the receiving water. (Source: Order No. R4-2012-0175) a
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Biofiltration means a LID BMP that reduces stormwater pollutant discharges by intercepting
rainfall on vegetative canopy, and through incidental infiltration and/or evapotranspiration, and z
filtration. Incidental infiltration is an important factor in achieving the required pollutant Toad C
reduction. Therefore, the term "biofiltration" as used in this Ordinance, is defined to include only
systems designed to facilitate incidental infiltration or achieve the equivalent pollutant reduction
as biofiltration BMPs with an underdrain (subject to approval by the Regional Board's Executive a
Officer). Biofiltration BMPs include bioretention systems with an underdrain and bioswales. o
(Modified from: Order No. R4-2012-0175)
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Bioretention means a LID BMP that reduces stormwater runoff by intercepting rainfall on
vegetative canopy, and through evapotranspiration and infiltration. The bioretention system $
typically includes a minimum two -foot top layer of a specified soil and compost mixture E
underlain by a gravel -filled temporary storage pit dug into the in-situ soil. As defined in the c
Municipal NPDES permit, a bioretention BMP may be designed with an overflow drain, but may
not include an underdrain. When a bioretention BMP is designed or constructed with an
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underdrain it is regulated by the Municipal NPDES permit as biofiltration. E
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(Modified from: Order No. 114-2012-0175)
Bioswale means a LID BMP consisting of a shallow channel lined with grass or other dense,
low -growing vegetation. Bioswales are designed to collect stormwater runoff and to achieve a
uniform sheet flow through the dense vegetation for a period of several minutes.
(Source: Order No. R4-2012-0175)
Clean Water Act (CWA) means the Federal Water Pollution Control Act enacted in 1972, by
Public Law 92-500, and amended by the Water Quality Act of 1987. The Clean Water Act
prohibits the discharge of pollutants to Waters of the United States unless the discharge is in
accordance with an NPDES permit.
Commercial Malls means any development comprised of one or more buildings forming a
complex of stores, which sells various merchandise, with interconnecting walkways enabling
visitors to easily walk from store to store, along with parking area(s). A commercial mall
includes, but is not limited to: mini -malls, strip malls, other retail complexes, and enclosed
shopping malls or shopping centers. (Source: Order No. R4-2012-0175)
Construction Activity means any construction or demolition activity, clearing, grading,
grubbing, or excavation or any other activity that results in land disturbance. Construction does
not include emergency construction activities required to immediately protect public health and
safety or routine maintenance activities required to maintain the integrity of structures by
performing minor repair and restoration work, maintain the original line and grade, hydraulic
capacity, or original proposes of the facility. See "Routine Maintenance" definition for further
explanation. Where clearing, grading, or excavating of underlying soil takes place during a
repaving operation, State General Construction Permit coverage by the State of California
General Permit for Storm Water Discharges Associated with Industrial Activities or for
Stormwater Discharges Associated with Construction Activities is required if more than one acre
is disturbed or the activities are part of a larger plan. (Source: Order No. R4-2012-0175)
Control means to minimize, reduce, or eliminate by technological, legal, contractual, or other
means, the discharge of pollutants from an activity or activities.
(Source: Order No. R4-2012-0175)
Development means construction, rehabilitation, redevelopment, or reconstruction of any public
or private residential project (whether single-family, multi -unit, or planned unit development);
industrial, commercial, retail, and other non-residential projects, including public agency projects
or mass grading for future construction. It does not include routine maintenance to maintain
original line and grade, hydraulic capacity, or original purpose of facility, nor does it include
emergency construction activities required to immediately protect public health and safety.
(Source: Order No. R4-2012-0175)
Directly Adjacent means situated within 200 feet of the contiguous zone required for the
continued maintenance, function, and structural stability of the environmentally sensitive area.
(Source: Order No. R4-2012-0175)
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Discharge means any release, spill, leak, pump, flow, escape, dumping, or disposal of any liquid,
semi-solid, or solid substance.
Disturbed Area means an area that is altered as a result of clearing, grading, and/or excavation.
(Source: Order No. R4-2012-0175)
Flow-through BMPs means modular, vault type "high flow biotreatment" devices contained
within an impervious vault with an underdrain or designed with an impervious liner and an
underdrain. (Modified from: Order No. R4-2012-0175)
General Construction Activities Storm Water Permit (GCASP) means the general NPDES
permit adopted by the State Board, which authorizes the discharge of stormwater from
construction activities under certain conditions.
General Industrial Activities Storm Water Permit (GIASP) means the general NPDES
permit adopted by the State Board, which authorizes the discharge of stormwater from certain
industrial activities under certain conditions.
Green Roof means a LID BMP using planter boxes and vegetation to intercept rainfall on the
roof surface. Rainfall is intercepted by vegetation leaves and through evapotranspiration. Green
roofs may be designed as either a bioretention BMP or as a biofiltration BMP. To receive credit
as a bioretention BMP, the green roof system planting medium shall be of sufficient depth to
provide capacity within the pore space volume to contain the design storm depth and may not be
designed or constructed with an underdrain. (Source: Order No. R4-2012-0175)
Hazardous Material(s) means any material(s) defined as hazardous by Division 20, Chapter
6.95 of the California Health and Safety Code.
Hillside means a property located in an area with known erosive soil conditions. where the
development contemplates grading on any natural slope that is 25 percent or greater and where
grading contemplates cut or fill slopes. (Source: Order No. R4-2012-0175)
Hydromodificafion means the alteration of the hydrologic characteristics of coastal and non -
coastal waters, which in turn could cause degradation of water resources. Hydromodification can
cause excessive erosion and/or sedimentation rates, causing excessive turbidity, channel
aggradation, and/or degradation. (Source: General Construction Activities Stormwater Permit)
Impervious Surface means any man-made or modified surface that prevents or significantly
reduces the entry of water into the underlying soil, resulting in runoff from the surface in greater
quantities and/or at an increased rate, when compared to natural conditions prior to development.
Examples of places that commonly exhibit impervious surfaces include parking Tots, driveways,
roadways, storage areas, and rooftops. The imperviousness of these areas commonly results from
paving, compacted gravel, compacted earth, and oiled earth.
Industrial Park means land development that is set aside for industrial development. Industrial
parks are usually located close to transport facilities, especially where more than one transport
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modalities coincide: highways, railroads, airports, and navigable rivers. It includes office parks,
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which have offices and light industry. (Source: Order No. R4-2012-0175)
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Infiltration BMP means a LID BMP that reduces stormwater runoff by capturing and
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infiltrating the runoff into in-situ soils or amended onsite soils. Examples of infiltration BMPs
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include infiltration basins, dry wells, and pervious pavement. (Source: Order No. R4-2012-0175)
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Low Impact Development (LID) means any building and landscape features designed to retain
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or filter stormwater runoff. (Source: Order No. R4-2012-0175)
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MS4 means Municipal Separate Storm Sewer System (MS4). The MS4 is a conveyance or
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system of conveyances (including roads with drainage systems, municipal streets, catch basins,
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curbs, gutters, ditches, manmade channels, or storm drains):
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I. Owned or operated by a state, city, town, borough, county, parish, district,
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association, or other public body (created by or pursuant to State law) having
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jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes,
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including special districts under State law such as a sewer district, flood control
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district or drainage district, or similar entity, or an Indian tribe or an authorized Indian
tribal organization, or a designated and approved management agency under section
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208 of the C WA that discharges to waters of the United States;
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2. Designed or used for collecting or conveying stormwater,
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3. Which is not a combined sewer; and
4. Which is not part of a Publicly Owned Treatment Works, as defined in
a. Title 40 of the Code of Federal Regulations (CFR) §122.2.26(b)(8)
(Source: Order No. R4-2012-0175).
National Pollutant Discharge Elimination System (NPDES) means the national program for
issuing, modifying, revoking and reissuing, terminating, monitoring and enforcing permits, and
imposing and enforcing pretreatment requirements, under CWA §307, 402, 318, and 405. The
term includes an "approved program." (Source: Order No. R4-2012-0175)
Natural Drainage System means a drainage system that has not been improved (e.g.,
channelized or armored). The clearing or dredging of a natural drainage system does not cause
the system to be classified as an improved drainage system. (Source: Order No. R4-2012-0175)
New Development means land -disturbing activities; structural development, including
construction or installation of a building or structure, creation of impervious surfaces; and land
subdivision. (Source: Order No. R4-2012-0175)
Non-Stormwater Discharge means any discharge to a municipal storm drain system not
composed entirely of stormwater. (Source: Order No. R4-2012-0175)
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Parking Lot means an area or facility for the temporary parking or storage of motor vehicles
used for businesses or commerce, industry, or personal use, with a lot size of 5,000 square feet or
more of surface area, or with 25 or more parking spaces. (Source: Order No. R4-2012-0175)
Planning Priority Projects means development projects subject to Permittee conditioning and
approval for the design andimplementation of post -construction controls to mitigate stormwater
pollution, prior to completion of the project(s). (Modified from: Order No. R4-2012-0175)
Pollutant means any "pollutant' defined in Section 502(6) of the Federal Clean Water Act or
incorporated into the California Water Code See. 13373. Pollutants may include, but are not
limited to the following:
1. Commercial and industrial wastes (such as fuels, solvents, detergents, plastic pellets,
hazardous substances, fertilizers, pesticides, slag, ash, and sludge).
2. Metals (such as cadmium, lead, zinc, copper, silver, nickel, chromium; and non-
metals such as phosphorus and arsenic).
3. Petroleum hydrocarbons (such as fuels, lubricants, surfactants, waste oils, solvents,
coolants, and grease).
4. Excessive eroded soil, sediment, and particulate in in amounts that may
adversely affect the beneficial use of the receiving waters, flora, or fauna of the State
5. Animal wastes (such as discharge from confinement facilities, kennels, pens,
recreational facilities, stables, and show facilities).
6. Substances having characteristics such as pl-1 less than six or greater than nine, or
unusual coloration or turbidity, or excessive levels of fecal coliform, or fecal
streptococcus, or enterococcus.
Project means all development, redevelopment, and land -disturbing activities. The term is not
limited to "Project' as defined under CEQA (Pub. Resources Code §21065).
(Source: Order No. R4-2012-0175)
Rainfall Harvest and Use means a LID BMP system designed to capture runoff, typically from
a roof, but can also include runoff capture from elsewhere within the site, and to provide for
temporary storage until the harvested water can be used for irrigation or non -potable uses. The
harvested water may also be used for potable water uses if the system includes disinfection
treatment and is approved for such use by the local building department.
(Source: Order No. R4-2012-0175)
Receiving Water means "water of the United States" into which waste and/or pollutants are or
may be discharged. (Source: Order No. R4-2012-0175)
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Redevelopment means land -disturbing activity that results in the creation, addition, or
replacement of 5,000 square feet or more of impervious surface area on an already developed
site. Redevelopment includes, but is not limited to: the expansion of a building footprint;
addition or replacement of a structure; replacement of impervious surface area that is not part of
routine maintenance activity; and land -disturbing activity related to structural or impervious
surfaces. It does not include routine maintenance to maintain original line and grade, hydraulic
capacity, or original purpose of facility, nor does it include emergency construction activities
required to immediately protect public health and safety. (Source: Order No. R4-2012-0175)
Restaurant means a facility that sells prepared foods and drinks for consumption, including
stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate
consumption (SIC Code 5812). (Source: Order No. R4-2012-0175)
Retail Gasoline Outlet means any facility engaged in selling gasoline and lubricating oils.
(Source: Order No. R4-2012-0175)
Routine Maintenance means, but is not limited to, projects conducted to:
I . Maintain the original line and grade, hydraulic capacity, or original purpose of the
facility.
2. Perform as -needed restoration work to preserve the original design grade, integrity
and hydraulic capacity of flood control facilities.
3. Includes road shoulder work, regrading dirt or gravel roadways and shoulders, and
performing ditch cleanouts.
4. Replacing existing lines with new materials or pipes and updating facilities to comply
with applicable codes, standards, and regulations regardless if such projects result in
increased capacity.
5. Repair leaks.
Routine maintenance does not include construction of new lines (i.e. that are not associated with
existing facilities and are not part of a project to update or replace existing lines) or facilities
resulting from compliance with applicable codes, standards, and regulations.
(Source: Order No. R4-2012-0175)
Significant Ecological Areas (SEAs) means an area that is determined to possess an example of
biotic resources that cumulatively represent biological diversity, for the purposes of protecting
biotic diversity, as part of the City of Santa Clarita General Plan. Areas are designated as SEAs,
if they possess one or more of the following criteria:
1. The habitat of rare, endangered, and threatened plant and animal species.
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2. Biotic communities, vegetative associations, and habitat of plant and animal species
that are either one of a kind, or are restricted in distribution on a regional basis.
3. Biotic communities, vegetative associations, and habitat of plant and animal species
that are either one of kind or are restricted in distribution in Los Angeles County.
4. Habitat that at some point in the life cycle of a species or group of species, serves as a
concentrated breeding, feeding, resting, or migrating grounds and is limited in
availability either regionally or within Los Angeles County.
5. Biotic resources that are of scientific interest because they are either an extreme in
physical/geographical limitations, or represent an unusual variation in a population or
community.
6. Areas important as game species habitat or as fisheries.
7. Areas that would provide for the preservation of relatively undisturbed examples of
natural biotic communities in Los Angeles County.
8. Special areas (Source: Order No. R4-2012-0175).
Site means land or water area where any "facility or activity' is physically located or conducted, LL
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including adjacent land used in connection with the facility or activity.
(Source: Order No. R4-2012-0175) N
Storm Drain System means any facilities or any part of those facilities, including streets,
gutters, conduits, natural or artificial drains, channels, and watercourses that are used for the
purpose of collecting, storing, transporting or disposing of stormwater.
Storm Water or Stormwater means water that originates from atmospheric moisture (rain or u
snow) and that falls onto land, water, or other surfaces. Without any change in its meaning, this
term may be spelled or written as one word or two separate words. a
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Stormwater Runoff means that part of precipitation (rainfall or snowmelt), which travels across is
a surface to the storm drain system or receiving waters.
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SUSMP means the Los Angeles Countywide Standard Urban Stormwater Mitigation Plan. The a
SUSMP was required as part of the previous Municipal NPDES Permit (Order No. 01-182, m
NPDES No. CAS004001) and required plans that designate best management practices (BMPs) o
that must be used in specified categories of development projects. 5
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Urban Runoff means surface water flow produced by storm and non -storm events that is shed E
from both pervious and non -pervious surfaces. Non -storm events that produce urban runoff c
include flow from residential, commercial, or industrial activities involving the use of potable J
and non -potable water.
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17.95.040 Rate of Discharge.
No new development shall increase the peak rate of discharge of stormwater from the developed
site if this increase would make downstream erosion more probable.
17.95.050 Subdivision Design.
Unless inconsistent with vested rights, the site design for all subdivisions subject to this chapter,
to the maximum extent practicable, shall:
A. Concentrate or cluster new development on portions of the site while leaving the remaining
land in a natural undisturbed condition:
B. Limit clearing and grading of native vegetation to the minimum extent practicable, consistent
with the construction of lots, and to allow access and provide fire protection;
C. Preserve riparian areas and wetlands.
17.95.060 Best Management Practices (BMPs).
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A. On the date the ordinance codified in this chapter takes effect, those BMPs which are listed W
in the Los Angeles County Low Impact Development (LID) Standards Manual shall be
deemed to be incorporated by reference and adopted by this City and shall remain in effect °O
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until the City Council shall adopt by resolution a guidebook prepared or recommended by the
City Engineer, categorizing development and BMPs for each category.
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B. The City Engineer may from time to time revise the guidebook, and the City Council may
adopt these revisions by resolution.
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regulated under this chapter, unless the guidebook recommends that practice. 5
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D. No structural or treatment control BMP may be used in any development regulated uOnder this o
chapter unless the guidebook recommends that practice.
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17.95.070 Control of Erosion of Slopes and Channels. c
BMPs used on slopes or channels in new development or redevelopment subject to this chapter
shall:
A. Convey runoff from tops of slopes;
B. Eliminate or reduce flow to natural drainage systems, and for flows which cannot be
eliminated, utilize natural drainage systems, rather than artificial drainage systems, to the
maximum extent practicable;
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C. Stabilize soil at permanent channel crossings;
D. Vegetate slopes with native or drought -tolerant species known to control erosion; and
E. Dissipate concentrated Flows before they enter unlined channels.
17.95.080 Signage of Storm Drains.
In the project area of new development or redevelopment subject to this chapter, a notice that
dumping in storm drains and catch basins is illegal shall be:
A. Stenciled in paint or other permanent means at all storm drain inlets and catch basins within
the project area;
B. Posted at all known public accesses to natural or artificial drainage channels within the
project area; and
C. Maintained to preserve the sign.
17.95.090 Outdoor Storage of Materials.
A. All materials stored outdoors in new development or redevelopment subject to this chapter
which, if exposed to stormwater, may reasonably be expected to add pollutants to it, shall be
thoroughly isolated from contact:
I. With stormwater, by enclosure in a structure; or
2. With stormwater, by a surrounding curb or other containment structure.
B. The storage area must be completely covered:
I. By impermeable paving; and
2. Any structure by an overhead covering that adequately diverts precipitation away
from the ground between the material and the surrounding containment structure.
17.95.100 Outdoor Trash Storage Areas.
Except where they serve only single-family residences, solid waste containers in new
development or redevelopment subject to this chapter shall be stored in areas that:
A. Are isolated from contact with stormwater originating outside the storage area; and
B. Are surrounded with a barrier sufficient to prevent all trash and debris from being transported
out of the storage area, except during collection.
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17.95.110 Maintenance of Best Management Practices.
A. Every person applying to the City for discretionary approval of any new development or
redevelopment subject to this chapter, as part of that application, in a signed writing, shall
agree to maintain any structural or treatment control BMP to be implemented in that
development through means such as a covenant running with the land (such as covenants,
conditions and restriction, commonly known as CC&Rs), CEQA mitigation measures,
conditional use permit or other legal agreement (collectively "agreement').
B. The agreement described in subsection (A) of this section shall remain in force until
ownership of the developed property has been entirely transferred, and upon transfer, shall be
binding on the new owner(s).
17.95.120 Design Standards for Stormwater Pollution Control Requirements.
The site for every Planning Priority Project shall be designed to control pollutants, pollutant
loads, and runoff volume to the maximum extent feasible by minimizing impervious surface area
and controlling runoff from impervious surfaces through infiltration, evapotranspiration,
biorctention and/or rainfall harvest, and use.
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A. Anew single-family hillside home development shall include mitigation measures to.-
1.
o:L Conserve natural areas; P
2. Protect slopes and channels;
3. Provide storm drain system stenciling and signage;
4. Divert roof runoff to vegetated areas before discharge unless the diversion would
result in slope instability or damage building foundations; and
5. Direct surface flow to vegetated areas before discharge, unless the diversion would
result in slope instability or damage building foundations.
B. Street and road construction of 10,000 square feet or more of impervious surface shall follow
USEPA guidance regarding Managing Wet Weather with Green Infrastructure: Green Streets
(December 2008 EPA -833-F-08-009) to the maximum extent practicable.
C. All other Planning Priority Projects shall prepare a LID Plan to comply with the following:
Retain stormwater runoff onsite for the Stormwater Quality Design Volume �
(SWQDv) defined as the runoff from:
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a. The 85th percentile 24-hour runoff event as determined from the Los Angeles
County 85th percentile precipitation isohyetal map; or
b. The volume of runoff produced from a 0.75 inch, 24-hour rain event, whichever is
greater.
Minimize hydromodification impacts to natural drainage systems, as defined in the
Municipal NPDES Permit, as described below:
a. Projects disturbing an area greater than one acre but less than 50 acres must
demonstrate the project is designed to retain onsite, through infiltration,
evapotranspiration, and/or harvest and use, the stormwater volume from the
runoff of the 95th percentile, 24-11our storm event, or the runoff flow rate,
volume, velocity, and duration for the post -development condition for the two-
year, 24-hour rainfall event; or
b. Projects disturbing 50 acres or more must demonstrate the project infiltrates
onsite at least the runoff from a two-year, 24-hour storm event, or the runoff flow
rate, volume, velocity, and duration for the post -development condition for the
two-year, 24-hour rainfall event.
17.95.190 Violations.
A. Violation of any provision of this chapter shall be both a misdemeanor and a public nuisance.
B. The remedies specified in this chapter shall not exclude any other legal remedy that may be
available to the City.
17.95.200 Inspections.
A. The City Engineer and such officers as the City Engineer may designate shall enforce the
provisions of this chapter.
B. As necessary, these officers may, at a reasonable time and in a manner authorized by the laws
of California, enter and make inspections on any property regulated under this chapter.
17.95.210 Fees.
The City. Council may establish and fix the amount of fees for services provided under this
chapter, as authorized under Sections 66016 and 66018 of the California Government Code and
this code.
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17.95.220 Alternative Compliance.
Technical Infeasibility - When, as determined by the City Engineer or his/her appointee, 100
percent onsite retention of the SWQDv is technically infeasible, partially or fully, the
infeasibility shall be demonstrated in the submitted LID Plan. The technical infeasibility may
result from conditions that may include, but are not limited to:
A. The infiltration rate of saturated in-situ soils is less than 0.3 inch per hour, and it is not
technically feasible to amend the in-situ soils to attain an infiltration rate necessary to achieve
reliable performance of infiltration or bioretention BMPs in retaining the SWQDv onsite.
B. Locations where seasonal high groundwater is within five to ten feet of surface grade;
C. Locations within 100 feet of a groundwater well used for drinking water;
D. Brownfield development sites or other locations where pollutant inobilization is a
documented concern;
E. Locations with potential geotechnical hazard;
F. Smart growth and infill or redevelopment locations, where the density and/or nature of the
project would create significant difficulty for compliance with the onsite volume retention
requirement.
If partial or complete onsite retention is technically infeasible, the project site may biofiltrate
1.5 times the portion of the remaining SWQDv that is not reliably retained onsite.
Biofiltration BMPs must adhere to the design specifications provided in the Municipal
NPDES Permit.
I . Additional alternative compliance options, such as offsite infiltration, may be
available to the project site. The project site should contact the City Engineer or
his/her appointee to determine eligibility. Alternative compliance options are further
specified in the Los Angeles County 2014 Low Impact Development Standards
Manual (2014 LID Standards Manual).
G. The remaining SWQDv that cannot be retained or biofiltered onsite must be treated to reduce
pollutant loading. BMPs must be selected and designed to meet pollutant -specific
benchmarks as required per the Municipal NPDES Permit. Flow-through BMPs may be used
to treat the remaining SWQDv and must be sized based on a rainfall intensity of:
1. 0.2 inches per hour, or
2. The one-year, one-hour rainfall intensity as detennined from the most recent Los
Angeles County isohyetal map, whichever is greater.
H. A Multi -Phased Project may comply with the standards and requirements of this section for
all of its phases by: (a) designing a system acceptable to the City Engineer to satisfy these
standards and requirements for the entire site during the first phase, and (b) implementing
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these standards and requirements for each phase of development or redevelopment of the site
during the first phase or prior to commencement of construction of a later phase, to the extent
necessary to treat the stormwater from such later phase. For purposes of this section, "Multi -
Phased Project' shall mean any Planning Priority Project implemented over more than one
phase and the site of a Multi -Phased Project shall include any land and water area designed
and used to store, treat, or manage stormwater runoff in connection with the development or
redevelopment, including any tracts, lots, or parcels of real property, whether developed or
not, associated with, functionally connected to, or under common ownership or control with
such development or redevelopment. (Source: Order No. R4-2012-0175)
SECTION 2. This Ordinance shall become effective and in full force on
January 1, 2016.
SECTION 3. The City Clerk shall certify to the passage of this Ordinance and shall
cause the same to be published as required by law.
PASSED, APPROVED, AND ADOPTED this day of May 2015.
MAYOR
ATTEST:
CITY CLERK
DATE:
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STATE OF CALIFORNIA ) o
COUNTY OF LOS ANGELES ) ss. F
CITY OF SANTA CLARITA ) z
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1, Kevin Tonoian, City Clerk of the City of Santa Clarita, do hereby certify that the O
foregoing Ordinance 15- was regularly introduced and placed upon its first reading at a regular w
meeting of the City Council on the day of 2015, by the following vote, to wit: o
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AYES: COUNCILMEMBERS:
NOES: COUNCILMEMBERS: 0
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ABSENT: COUNCILMEMBERS:
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AND I FURTHER CERTIFY that the foregoing is the original of Ordinance 15- and w
was published in The Signal newspaper in accordance with State Law (G.C. 40806). re
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