HomeMy WebLinkAbout2015-05-12 - AGENDA REPORTS - LOW IMPACT DEV ORD (2)0
PUBLIC HEARING
CITY OF SANTA CLARITA
CITY MANAGER APPROVAL:
DATE: May 12, 2015
AGENDA REPORT
Agenda Item: 9
SUBJECT: FIRST READING OF THE LOW IMPACT DEVELOPMENT (LID)
ORDINANCE
DEPARTMENT: Public Works
PRESENTER: Travis Lange
RECOMMENDED ACTION
City Council conduct a public hearing and introduce and pass to a second reading 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 17.95 STANDARD URBAN STORMWATER MITIGATION PLAN
IMPLEMENTATION BY INCORPORATING LOW IMPACT DEVELOPMENT (LID)
STRATEGIES ON CERTAIN DEVELOPMENT PROJECTS."
BACKGROUND
Provision of the Municipal Stormwater Permit
In late 2012, the State -issued Municipal Stormwater National Pollutant Discharge Elimination
System Permit (Permit) became effective. This is the fourth iteration of the Permit issued by the
State of California (State) to municipalities since 1990, as part of the Federal Water Pollution -
Control Act (Clean Water Act). The current version of the Permit contains new requirements
related to management of surface water quality that affects the City of Santa Clarita (City), Los
Angeles County (County) and 84 incorporated cities throughout the County of Los Angeles. (The
City of Long Beach has a separate Permit. The City of Avalon is required to follow a Phase 2
General Permit for small stormwater systems. The Cities of Palmdale and Lancaster have a
permit issued by the Lahontan Regional Water Quality Control Board.)
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. The term `low impact development' consists of building landscape features
or storage vessels designed to retain Stormwater runoff and filter pollutants with the intent of
preventing polluted runoff from entering the storm drain system and affecting local waterways.
Ordinance passed to
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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.
Guidelines, City Projects, and LID Experience
LID guidelines are included in the City's General Plan Conservation and Open Space Element by
way of stated objectives and policies to limit disruption of natural hydrology, reducing
impervious cover, increasing onsite infiltration, and managing stormwater runoff at the source.
Recent City capital improvement projects have incorporated LID strategies into their design,
including the McBean Transfer Station, Old Town Newhall Library, and the Valencia Library
parking lot expansion.
The County adopted a LID ordinance in November 2013, incorporating the new stormwater
runoff water quality and hydromodification requirements for new development and
redevelopment projects. The County LID ordinance affects development projects in the
unincorporated areas of the Santa Clarita Valley. Developers working in the County have been
aware of LID design concepts for several years. City staff held a Development Advisory
Committee meeting on April 21, 2015, to further advise developers about the concept of LID
principles and criteria.
The County has developed a LID Standards Manual and made it available online. The manual
explains how a site designer/engineer could use a wide array of techniques that focus on site -
level hydrologic control to meet LID regulations. The LID manual describes those techniques,
provides examples and descriptions of how they work, and contains best management practice
fact sheets. City staff will create handouts for the public counter to further help the public
implement this requirement in their projects.
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:
1. 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 1.0,000 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:
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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
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:
I . 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 a 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 sire of a typical spa.
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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.
If approved by City Council, 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.
Public Notice
Notice for the Planning Commission hearing consisted of a one-eighth page legal advertisement
in The Signal newspaper on February 24, 2015. As of the writing of this staff report, staff has
received no correspondence or revisions from the community or from the Planning Commission
meeting held on April 7, 2015. Notice for the City Council Public Hearing consisted of a one-
eighth page legal advertisement in The Signal newspaper on April 21, 2015.
City staff held a Development Advisory Committee meeting on April 21, 2015, in an effort to
inform local developers about the LID requirements and applicability to future development
projects.
Recommendation from Planning Commission
The City of Santa Clarita Planning Commission adopted Resolution PI 5-02 at their regularly
scheduled meeting on April 7, 2015. Resolution P15-02 recommends the City Council approve
Master Case No. 15-007, which includes Unified Development Code Amendment 15-001.
ALTERNATIVE ACTION
1. City Council may choose not to adopt the ordinance. However, the City would not be in
compliance with the terms of the Permit and would be subject to administrative or civil
liabilities, criminal penalties, and/or other enforcement remedies from local, state, or federal
entities. The City must have an LID ordinance passed by June 28, 2015, to submit the
Enhanced Watershed Management Plan.
2. Other actions, as determined by the City Council.
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FISCAL IMPACT
The effect on the General Fund for future capital improvement projects to implement LID
principles into specified projects, including new Green Streets requirements, is undetermined.
ATTACHMENTS
Public Hearing Notice
Low Impact Development Municipal Code Red -line Strikeout - Exhibit A
Low Impact Development Ordinance
Planning Commission Resolution PI 5-02
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CITY OF SANTA CLARITA
•` '"• PUBLIC WORKS DEPARTMENT
23920 Valencia Boulevard
1 Santa Clarita, CA 91355
NOTICE OF PUBLIC HEARING
APPLICATION: - Master Case 15-007; Unified Development Code Amendment 15-001
PROJECT LOCATION: Citywide
PROJECT APPLICANT: City of Santa Clarita, Environmental Services Division
PROJECT DESCRIPTION: This is a request to update the City of Santa Clarita's Unified Development
Code to be consistent with the Municipal Storm Water National Pollutant
Discharge Elimination System Permit development standards, including Low
Impact Development requirements, as required by state law.
PLANNING COMMISSION ACTION: On April 7, 2015, the Planning Commission voted 5-0 to
recommend that the City Council approve Master Case 15-007 along
with the Notice of Exemption prepared for the project.
The City of Santa Clarita City Council will conduct a public hearing on this matter on the following date:
DATE: May 12, 2015
TIME: 6:00 p.m.
LOCATION: City of Santa Clarita, Council Chambers
23920 Valencia Boulevard, First Floor
Santa Clarita, CA 91355
A NOTICE OF EXEMPTION was prepared for the proposed project. The proposed project is exempt from U)
the California Environmental Quality Act (CEQA) under Article 19, Categorical Exemptions, Section 15308. LL
Class 8. A Class 8 exemption consists of actions taken by regulatory agencies, as authorized by state or local co
ordinance, to assure the maintenance, restoration, enhancement, or protection of the environment where the N
regulatory process involves procedures for protection of the environment.
If you wish to challenge the action taken on this matter in court, you may be limited to raising only those
issues you or someone else raised at the public hearing described in this notice or written correspondence
delivered to the City of Santa Clarita, at or prior to, the public hearing.
For further information regarding this proposal, please contact Project Manager Oliver Cramer, at the City of
Santa Clarita Permit Center, 23920 Valencia Boulevard, Suite 140, Santa Clarita, CA 91355, or by telephone
at(661)286-4098.
Dated April 21, 2015 Published: The Signal on April 21, 2015
Kevin Tonoian, City Clerk '
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Chapter 17.95 of the Santa Clarita Municipal Code shall be amended in its entirety to read is
pFepased to be amended as follows:
Sections:
17.95.010 Limits Purpose of Chapter.
17.95.020 Scope of Chapterand 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.
17.95.110 Maintenance of Best Management Practices.
17.95.120 Design Standards for Best Management Practices.
1 nc 1 nn r ,.,.a:..,. n,.,.1...
jj.q5-.Aq Repair and Nelaintenanee Bays,
17 oc 150 Wash A.ee..
1 7 95 160 o est.,...., nos
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7.95 .170 Retail Gasoline n, avis.
1: ne 1 Qn parking ret..
17.95.190 Violations.
17.95.200 Inspections.
17.95.210 Pees.
17.95.220 WaiveFAlternative Compliance
17.95.01014nvits-PurpOse of Chapter.
The provisions of this seetien-chapter contain requirements for post -construction stormwater
activities and facility operations of development and redevelopment proiects 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
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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), as well as
Waste Discharge Requirements under California law (the "Municipal NPDES permit'), lessen
the water qualitypacts 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:
A.A.—Infringe any right or power guaranteed by the California Constitution, including any
vested property right or
B. 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
E. E. Restrict otherwise lawful land- use except as authorized by the laws of California,
subject to the limitations of this chapter. (Ord 13 v s n (Exh. 6/11/13)
17.95.020 Scope of Chapter -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
Clarita (City) to further define and adopt stormwater pollution control measures, to develop LID
principles and requirements, including but not limited to the objectives and specifications for
integration of LID strategies, and to grant alternate compliance as allowed by the Municipal
NPDES permit and collect fees from projects granted exceptions. Except as otherwise provided
herein, the City ^f ra t^ Qaf4a shall administer, implement and enforce the provisions of this
Section. Guidance documents supporting implementation of requirements in this Ordinance are
hereby incorporated by reference, including SUSMP and the Los Angeles County Low Impact
Development Standards Manual, and all future amendments. This chapter shell take effect on
February 15, 2001, and shall apply enly to approval of diseretionary (Withili the MeaHiRg Of the
r..r.r . -ia Enyi...nmental Quality Act Public Req-Rurces CR& ceetio . P 1000 et se..) new
development ,. fedeyelopment (as these, ♦e.....,q a e deli -ed this G apte.),
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Applicability:
A. All development projects equal to (one) 1 acre or greater of disturbed area that adds more
than 10.000 square feet of impervious surface area.
A -R - Single-family residences on graded sites hillside homes.
B -.C. Industrial Ieem ..ep^:nl a :r.«:o that disturb one n acre 9F more of ._a
parks with 10,000 square feet or more of surface area.
QD. Commercial malls with 10.000 square feet or more of surface area.
E_Automotive Fepair shops -service facilities (Standard Industrial Classification (SIC) of
5013, 5014, 5511, 5541, 7532-7534 and 7536-7539 y
with 5,000 square feet or more of �
surface area.
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F. Retail gasoline outlets with 5,000 square feet or more of surface area.
G. Restaurants (Standard Industrial Classification (SIC) of 5812) with 5,000 square feet or a
more of surface area. x
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H. Parking lots with 5,000 square feet or more of impervious surface area, or with 25 or
more parking spaces 'o
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1. Streets and roads construction of 10,000 square feet or more of impervious surface area.
6-J. Projects located in or directly adjacent to, or discharging directly to an
E :•. ir.,.., enta"�y Sensifive-AFeaSignificant Ecological Area (ESASEA), where the
development will:
a. Discharge stormwater runoff that is likely to impact a sensitive biological species
or habitat; and
a:b.Create 2,500 square feet or more of impervious surface area
K. Redevelopment Projects
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1. Streets and roads construction of 10,000 square feet or more of impervious surface area.
6-J. Projects located in or directly adjacent to, or discharging directly to an
E :•. ir.,.., enta"�y Sensifive-AFeaSignificant Ecological Area (ESASEA), where the
development will:
a. Discharge stormwater runoff that is likely to impact a sensitive biological species
or habitat; and
a:b.Create 2,500 square feet or more of impervious surface area
K. Redevelopment Projects
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a. 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.
b. Where Redevelopment results in an alteration to more than fifty (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.
c. Where Redevelopment results in an alteration of less than fifty (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.
d. Redevelopment does not include routine maintenance activities that are conducted
to maintain original line and grade, hydraulic capacity, original purpose of facility N
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or emergency redevelopment activity required to protect public health and safety.
Impervious surface replacement, such as the reconstruction of parking lots and a
roadways which does not disturb additional area and maintains the originalrg ade a
and alignment, is considered a routine maintenance activity. Redevelopment does x
not include the repaving of existing roads to maintain original line and grade. w
e. 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.
Effective 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).
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 theme
StermwateF Mitigation Plan fer Los Angeles Count), and Cities on Los Angeles County"
approved by the Exee ,t:. e Offleer of the Calif rnia Regional va.ter Quality Control Board f r
the L A flgeleS Regi.. OR nn,._,.h v "Waste Discharge Requirements for Municipal
Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of Los Angeles
County, Except those Discharges Originating from the City of Long Beach MS4." issued by the
California Regional Water Oualitv Control Board --Los Angeles 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
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Elimi atiefi Sysfe._ 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.
Automotive Repair Shofi,- rvice Facility means a facility that is categorized in any one of the
following Standard Industrial Classification (SIC) and North American Industry Classification
System (NAICS) codes. For inspection purposes, permittees need not inspect facilities with SIC
codes 5013, 5014, 5541, 5511, provided that these facilities have no outside activities or
materials that may be exposed to stormwater (Source: Order No. 114-2012-0175).
Basin Plan means the Water Quality Control Plan, Los Angeles Region, Basin Plan for the
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).
implemented prevent, control, remove, er reduee pellation-
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 W
receiving waters. or designed to reduce the volume of stormwater or non-stormwater discharged
to the receiving water (Source: Order No. R4-2012-0175). w
Biofiltration means a LID BMP that reduces stormwater pollutant discharges by intercepting
rainfall on vegetative canopy, and through incidental infiltration and/or evapotranspiration, and
filtration. Incidental infiltration is an important factor in achieving the required pollutant load
reduction. Therefore, the term `biofiltration' as used in this Ordinance is defined to include only
Officer). Biofiltration BMPs include bioretention systems with an underdrain and bioswales.
(Modified from: Order No. R4-2012-01751
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 2 -foot top laver of a specified soil and compost mixture underlain
by a gravel -filled temporary storage pit dug into the in-situ soil. As defined in the 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 underdrain
it is regulated by the Municipal NPDES permit as biofiltration
(Modified from: Order No. R4-2012-0175)
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
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uniform sheet flow through the dense vegetation for a period of several minutes.
(Source: Order No. R4-2012-0175)
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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 development Malls means any development an private land that is n^' residential O
deveiepment" includes, but is not iifflked to, hospitals, laboratories and other medical , Q
-- --------- reeFeational faeflities, plant nurseries, Faulti apaFtment buildings, ea LU
hotels,wash f4eilities, mifli Fnalis and other business eomple*es, shopping Malls, effleebuildingst-
publie and ether light industrial eemplexes not within the seepe of tn
c o Section 122.26 v, comprised of one or more buildings forming a complex of stores LL
which sells various merchandise, with interconnecting walkways enabling visitors to easily walk N
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 a
(Source: Order No. R4-2012-0175). =
Construction Activitv means anv construction or demolition activity. clearing. gradin
grubbing, or excavation or any other activity that result 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 purposes 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 anv 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
proiects: or mass grading for future construction. It does not include routine maintenance to
maintain original line andrag de, hydraulic capacity, or original purpose of facility, nor does it
include emervencv construction activities reouired to immediatelv protect public health and
safety (Source: Order No. R4-2012-0175
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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. 114-2012-0175).
"Dire tl. anneeted impervious aFe" ("DCIA") means a land aFea made ,impermeahle t,
fi�RFA vAich runRffmay enteF a storm drainage system withOut first flowing aeress a permeable
land area.
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).
Evapotranspiration means the combined effect of evaporation from surface water and loss of
water as vapor through plants and released into the atmosphere.
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). a
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General Construction Activities Storm Water Permit (GCASP) means the general NPDES w
permit adopted by the State Board which authorizes the discharge of stormwater from
construction activities under certain conditions. v
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.
"C40'atpw than nine 9) unit hem e subdivi Sion" means ajiy subdivis a on where at least ten (10)
single fitm:L. or ni Iti f «.:1. dwelling units afe to be ,fie, elepe,J
Green Roof means a LID BMP using planter boxes and vegetation to intercept rainfall on the
roofsurface. 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 nye
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.! ez�als
..:11Fequire ....aging .... an natural slope ,. hieh is t., ent. five «eme«t (25%) ,. greateF
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% or greater and where grading
contemplates cut or fill slopes (Source: Order No. R4-2012-0175).
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Hydromodification means the alteration of the hydrologic characteristics of coastal and non -
coastal waters, which in tum 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).O
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 inrg eater
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 lots driveways,
roadways, storage areas, and rooftops. The imperviousness of these areas commonly results from
paving, compacted gravel, compacted earth, and oiled earth.
developments that disturb one (1) aeFe AF MAFe OF qul-faee a!'ea" means
.y r-sturs
,J ev ..l ep En eRt o private land that is ,.t F s-idde.d:.J tha .J' 1, onere., /1 \ .. meFeF U)
> to,
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Industrial Park means land development that is set aside for industrial development Industrial m
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parks are usually located close to transport facilities especially where more than one transport "'
77.
modalities coincide: highways, railroads, airports, and navigable rivers. It includes office parks a
which have offices and light industry (Source: Order No. R4-2012-0175). a
xx
Infiltration BMP means a LID BMP that reduces stormwater runoff by capturing and W
infiltrating the runoff into in-situ soils or amended onsite soils. Examples of infiltration BMPs
include infiltration basins, dry wells, and pervious pavement (Source: Order No. R4-2012-0175). m
Low Impact Development (LID) -means any building and landscape features designed to retain
or filter stormwater runoff (Source: Order No. R4-2012-0175).
MS4 means Municipal Separate Storm Sewer System (MS4). The MS4 is a conveyance or
system of conveyances (including roads with drainage systems municipal streets catch basins
curbs, gutters, ditches, manmade channels, or storm drains):
Owned or operated by a State, city, town, borough, county. parish. district. association. or
other public body (created by or pursuant to State law) having jurisdiction over disposal
of sewage industrial wastes stormwater, or other wastes including special districts
under State law such as a sewer district, flood control district or drainage district or
similar entity, or an Indian tribe or an authorized Indian tribal organization or a
designated and approved management agencv under section 208 of the CWA that
discharges to waters of the United States;
2. Designed or used for collecting or conveying stormwater
3. Which is not a combined sewer; and
Packet Pg. 201
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4. Which is not part of a Publicly Owned Treatment Works (POTW) 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 007, 402, 318, and 405. The
term includes an "approved program" (Source: Order No. R4-2012-0175).
Natural Drainage Svstem 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 the ^ ,thio on ,.a and or the eensfFaetien e fstruet, re or Rthe._
u _A ees or bets, 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 Svstem that is not
composed entirely of stormwater (Source: Order No. 114-2012-0175).
Parking Lot means an land -area or facility for the temporary parking or storage of motor
vehicles used personally orfor 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,, and 'Arhieh is
eXPE)Sed tO ^t,.,..,.,....to_ (Source: Order No. R4-2012-0175).
Planning Priority Projects means development projects subject to Permittee conditioning and
approval for the design and implementation of post -construction controls to mitigate stormwater
pollution, prior to completion of the projects) (Modified from: Order No. R4-2012-0175).
Pollutant means anv "pollutant' defined in Section 502(6) of the Federal Clean Water Act or
incorporated into the California Water Code Sec. 13373. Pollutants may include, but are not
limited to the following:
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, andreg ase).
4. Excessive eroded soil, sediment, and particulate materials in amounts that may adversely
affect the beneficial use of the receiving waters, flora, or fauna of the State.
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5. Animal wastes (such as discharge from confinement facilities, kennels, pens, recreational
facilities, stables, and show facilities).
6. Substances having characteristics such as pH less than 6 or greater than 9, or unusual
coloration or turbidity, or excessive levels of fecal coliform, or fecal streptococcus, or
enterococcus.
Proiect means all development, redevelopment, and land disturbing activities. The term is not
limited to "Proiect' as defined under CEOA (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. 114-2012-0175).
Reeeivina Water means "water of the United States" into which waste and/or pollutants are or a
may be discharged (Source: Order No. 114-2012-0175). x
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"Redevelopment" Meafls, on an already developed site, the ereatien er additiaH afat least five
thousand (5,000) square feet E)f iFnpefviR---q S-wf�sgq. Redevelopment ifieludes, but k net "mited
feplaeernent of impervious SUFfaee that is not part of a routine Fnainienanee aetivity; and lafld
disturbing aetivities related with struetural or impervious surfaees. Where redevelopment Fesults
in an impreme of loss than fifty percent 0
) of the impervious surfaees of a pFeviously existing
development, afid the existing development was nat subjeet to these SUSN412s, the design
st...,.7e.. s apply enly to the addition, and- ....t t,. thw- e.,t:..e de„ele.,ment
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 at ctivity 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 stem alene facility ivHer�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) "Restaurant" gees fiRt ined. ae ,.,.
as Fnaroiets and gFeeeFy
steres- (Source: Order No. R4-2012.0175).
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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:
1. Maintain the original line and grade, hydraulic capacity, or original purpose of the
facility. O -j
2.
Perform as -needed restoration work to preserve the original design grade, integrity and
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hydraulic capacity of flood control facilities.
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3.
Includes road shoulder work, regrading dirt or gravel roadways and shoulders, and
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performing ditch cleanouts.
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4.
Replacing existing lines with new materials or pipes and updating facilities to comply
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with applicable codes, standards, and regulations regardless if such proiects result in
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increased capacity.
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5.
Repair leaks.
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Routine maintenance does not include construction of new lines (i.e. that are not associated with
a
existing
facilities and are not part of a project to update or replace existing lines) or facilities
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.
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 .
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biotic resources that cumulatively represent biological diversity, for the purposes of protecting
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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:
v
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
9
are either one of a kind or are restricted in distribution in Los Angeles County.
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4.
Habitat that at some point in the life cycle of a species or group of species, serves as a
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concentrated breeding, feeding, resting, migrating grounds and is limited in availability
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either regionally or within Los Angeles County.
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5.
Biotic resources that are of scientific interest because they are either an extreme in
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pial/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
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natural biotic communities in Los Angeles County.
8.
Special areas (Source: Order No. R4-2012-0175).
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Site means land or water area where any "facility or activity' is physically located or conducted,
including adjacent land used in connection with the facility or activity
(Source: Order No. R4-2012-0175).
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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 event" means a Fainfall event that pFeduees Fnere than an@ tenth (0.1) inol; Rf
presipitatien separated firom the previous 4arm evei4 y at least seventY twe (72) hours efdry
vveatFie�
Storm Water or Stormwater means water that originates from atmospheric moisture (rain or
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
Stormwater Runoff means that part of precipitation (rainfall or snowmelt) which travels across
a_ surface to the storm drain system or receiving waters.
, m
SUSMP means the Los Angeles Countywide Standard Urban Stormwater Mitigation Plan The ¢
SUSMP was required as part of the previous Municipal NPDES Permit (Order No 01-182,
NPDES No. CAS004001) and required plans that designate best management practices (BMPs) x
that must be used in specified categories of development proiects w
I _. o-_. _I __----- a __ r___.__._._ V- ........b..,». »�...»...q ........�. ....ov. Y. srr-or
any other physioal, biological, or ehemical preeess. (Ord. 13 8 § 4 (Exh. A), 6,1"4"
Urban Runoff means surface water flow produced by storm and non -storm events that is shed
from both pervious and non -pervious surfaces. Non -storm events that produce urban runoff
include flow from residential, commercial, or industrial activities involving the use of notable
and non -potable water
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. (r).a 13 o c n Esz n
6F)1f13)
17.95.050 Subdivision Design.
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Unless inconsistent with vested rights, the site design for all subdivisions subject to this chapter, E
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to the maximum extent practicable, shall:
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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. (Ofd. 13 Q § ^ (Exh ^ zn 1 l3)
17.95.060 Best Management Practices (BMPs).
A. On the date the ordinance codified in this chapter takes effect, those best management w
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practices which are listed in ""ie." 1 and 2 A f the "Standard 11.".... c t,.............t F_ -r nZigat:en Plan �
for Los Angeles County afid Citic in res n ingeles roomy" a ..
ed ". the c_ e arc-_. .. t~
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of the CaliA-)Fs"_n Regional Water Quality Control Board for the Los Aiiigel�s Region, en March
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8, 2000, as modified by the Sta4e Water Reseurees GentrRl BRard- -on 0-Fdor ).AIQ 2000 14-,
the Los n
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 until the Council Q
shall adopt by resolution a guidebook prepared or recommended by the City Engineer, a
categorizing development and best management practices for each category. r
B. "Che City Engineer may from time to time revise the guidebook, and the Council may adopt
these revisions by resolution.
C. No best management practice other than a structural or treatment control best management
practice shall be used in any development regulated under this chapter, unless the guidebook
recommends that practice.
D. No structural or treatment control best management practice may be used in any development
regulated under this chapter unless the guidebook recommends that practice. Via. '� -t3 9 § 4
17.95.070 Control of Erosion of Slopes and Channels.
Best management practices 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 d
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maximum extent practicable; u
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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. (Ord. 11 8 c ^ (9*h. ^ `,
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 LL
the project area; N
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B. Posted at all known public accesses to natural or artificial drainage channels within the project ¢
area; and a
C. Maintained to preserve the sign. (Ord 12 9 § n ic.,r n 6,111/13)
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:
1. 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:
1. 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. (Ofd. 13 0 §4
rr e� ���iml ll
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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. (Ord. 13 9 7 ^ (Exh n N 4n 1 n 4N
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 !L
to maintain any structural or treatment control best management practice to be implemented in N
that development through means such as a covenant running with the land (such as covenants, a
conditions and restriction, commonly known as CC&Rs), CEQA mitigation measures, a
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conditional use permit or other legal agreement (collectively "agreement'). x
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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
bindingb on the new owner(). �vrd 13 (Os c ^ xh n c11 , 113)
9 u 7 T t(Bx.
17.95.120 Design Standards for Best Management es 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
bioretention and/or rainfall harvest and use.
I. A new single-family hillside home development shall include mitigation measures to:
a. Conserve natural areas;
b. Protect slopes and channels;
c. Provide storm drain system stenciling and signage;
d. Divert roof runoff to vegetated areas before discharge unless the diversion would
result in slope instability or damage building foundations; and
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9.b
e. Direct surface flow to vegetated areas before discharge, unless the diversion would
result in slope instability or damage building foundations.
2. 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.
3. All other Planning Priority Projects shall prepare a LID Plan to comply with the
following:
a. Retain stormwater runoff onsite for the Stormwater Quality Design Volume
(SWODv) defined as the runoff from:
i. The 85th percentile 24-hour runoff event as determined from the Los Angeles
Countv 85th percentile nrecinitation isohvetal man: or LL
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ii. The volume of runoff produced from a 0.75 inch, 24-hour rain event,
whichever is greater. C
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a-b.Minimize hydromodification impacts to natural drainage systems as defined in the
Municipal NPDES Permit as described below: w
i. Proiects disturbing an area greater than 1 acre but less than 50 acres must
demonstrate the project is designed to retain onsite, through infiltration,
rate, volume, velocity, and duration for the post -development condition for
the 2 -Year, 24-hour rainfall event, or
ii. Projects disturbing 50 acres or more must demonstrate the proiect
infiltrates onsite at least the runoff from a 2 -year, 24-hour storm event, or
the runoff flow rate, volume, velocity, and duration for the post -
development condition for the 2 -year, 24-hour rainfall event.
Ir
Packet Pg. 209
Ex p.
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9.b
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Ex p.
17
9.b
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Attachment: Low Impact Development Municipal Code Red -line Strikeout - Exhibit A (1228: FIRST READING OF THE LOW IMPACT
H.
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Attachment: Low Impact Development Municipal Code Red -line Strikeout - Exhibit A (1228 : FIRST READING OF THE LOW IMPACT
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. (Ord. 13 8 § n (Exh. 6,111/13)
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 vi
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of California, enter and make inspections on any property regulated under this chapter. (Ord 13- !i
9 § 4 (Exh A), tit W-3) a0
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17.95.210 Fees.
a
The Council may establish and fix the amount of fees for services provided under this chapter, as r
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authorized under Sections 66016 and 66018 of the California Government Code and this code.
in_a 13 9 C 4 (Exh n� tit t it Z�
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17.9.5.220 Waiver Alternative Compliance.
Technical Infeasibility - When, as determined by the City Engineer or his/her appointee 100
percent onsite retention of the S WQDv 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:
1. 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.
2. Locations where seasonal high groundwater is within five to ten feet of surface rade;
3. Locations within 100 feet of a groundwater well used for drinking water;
4. Brownfield development sites or other locations where pollutant mobilization is a
documented concern;
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9.b
5. Locations with potential geotechnical hazard;
6. Smart growth and infill or redevelopment locations where the density and/ or nature of
the proiect 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.
a. Additional alternative compliance options such as offsite infiltration may be M
available to the project Site. The proiect Site should contact the City Engineer or CO
his/her appointee to determine eligibility. Alternative compliance options are Q
further specified in the Los Angeles County 2014 Low Impact Development a
Standards Manual (2014 LID Standards Manual).
A. 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:
i. 0.2 inches per hour, or
ii. The I -year, 1 -hour rainfall intensity as determined from the most recent Los
Angeles County isohyetal map, whichever is greater.
B. 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 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 Protect" 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
21
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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)
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inadequate spaee f r treatment a sts a a redevelopment p ..t. e
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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 a
establish a LID Ordinance to participate in a Watershed Management Program and/or o0
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
Packet Pg. 2
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 projects 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.
17.95.020
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.
17.95.110
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 Stonnwater 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
Clarita (City) to further define and adopt stormwater pollution control measures, to develop LID
principles and requirements, including but not limited to the objectives and specifications for
integration of LID strategies, and to grant alternate compliance as allowed by the Municipal
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.
Guidance documents supporting implementation of requirements in this Ordinance are hereby
incorporated by reference, including SUSMP and the Los Angeles County Low Impact
Development Standards Manual, and all future amendments.
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 5812) 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
parking spaces
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1. 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:
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 stonnwater 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 stonnwater 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.
Effective 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).
17.95.030 Definitions.
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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 (MS4) Discharges within the Coastal
Watersheds of Los Angeles County, Except those Discharges Originating from the City of Long
Beach MS4," issued by the California Regional Water Quality Control Board --Los Angeles
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.
Automotive Service Facility means a facility that is categorized in any one of the following
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 551 I, provided these facilities have no outside activities or materials that
may be exposed to stormwater. (Source: Order No. 114-2012-0175)
Basin Plan means the Water Quality Control Plan, Los Angeles Region, Basin Plan for the
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)
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
receiving waters, or designed to reduce the volume of stormwater or non-stormwater discharged
to the receiving water. (Source: Order No. R4-2012-0175)
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Biofiltration means a LID BMP that reduces stormwater pollutant discharges by intercepting N
rainfall on vegetative canopy, and through incidental infiltration and/or evapotranspiration, and
filtration. Incidental infiltration is an important factor in achieving the required pollutant load
reduction. Therefore, the term "biofiltration" as used in this Ordinance, is defined to include only c
systems designed to facilitate incidental infiltration or achieve the equivalent pollutant reduction TO
as biofiltration BMPs with an underdrain (subject to approval by the Regional Board's Executive c
Officer). Biofiltration BMPs include bioretention systems with an underdrain and bioswales.
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(Modified from: Order No. R4-2012-0175) a
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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
underlain by a gravel -filled temporary storage pit dug into the in-situ soil. As defined in the
Municipal NPDES permit, a bioretention BMP may be designed with an overflow drain, but may
not include an underdrain. When a bioretcntion BMP is designed or constructed with an
underdrain it is regulated by the Municipal NPDES permit as biofiltration.
(Modified from: Order No. R4-2012-0175)
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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 purposes 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. 114-2012-0175)
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. 114-2012-0175)
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)
Discharge means any release, spill, leak, pump, flow, escape, dumping, or disposal of any liquid,
semi-solid, or solid substance.
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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 N
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development contemplates grading on any natural slope that is 25 percent or greater and where E
grading contemplates cut or fill slopes. (Source: Order No. R4-2012-0175) ao
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Hydromoditication means the alteration of the hydrologic characteristics of coastal and non- v
coastal waters, which in turn could cause degradation of water resources. Hydromoditication can c
cause excessive erosion and/or sedimentation rates, causing excessive turbidity, channel c
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 lots, 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 moo'
parks are usually located close to transport facilities, especially where more than one transport
modalities coincide: highways, railroads, airports, and navigable rivers. It includes office parks, E
which have offices and light industry. (Source: Order No. R4-2012-0175) r
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Infiltration BMP means a LID BMP that reduces stormwater runoff by capturing and
infiltrating the runoff into in-situ soils or amended onsite soils. Examples of infiltration BMPs
include infiltration basins, dry wells, and pervious pavement. (Source: Order No. R4-2012-0175)
Low Impact Development (LID) means any building and landscape features designed to retain
or filter stormwater runoff. (Source: Order No. R4-2012-0175)
MS4 means Municipal Separate Storm Sewer System (MS4). The MS4 is a conveyance or
system of conveyances (including roads with drainage systems, municipal streets, catch basins,
curbs, gutters, ditches, manmade channels, or storm drains):
Owned or operated by a state, city, town, borough, county, parish, district,
association, or other public body (created by or pursuant to State law) having
jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes,
including special districts under State law such as a sewer district, flood control
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
208 of the CWA that discharges to waters of the United States;
2. Designed or used for collecting or conveying stormwater.-
3.
tormwater;
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) c
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 and implementation 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 Sec. 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 materials 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-I less than six or greater than nine, or 00
unusual coloration or turbidity, or excessive levels of fecal coliform, or fecal N
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 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:
1. 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 a 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,
including adjacent land used in connection with the facility or activity.
(Source: Order No. R4-2012-0175)
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
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.
Stormwater Runoff means that part of precipitation (rainfall or snowmelt), which travels across
a surface to the storm drain system or receiving waters.
SUSMP means the Los Angeles Countywide Standard Urban Stormwater Mitigation Plan. The
SUSMP was required as part of the previous Municipal NPDES Permit (Order No. 01-182,
NPDES No. CAS004001) and required plans that designate best management practices (BMPs)
that must be used in specified categories of development projects.
Urban Runoff means surface water flow produced by storm and non -storm events that is shed
from both pervious and non -pervious surfaces. Non -storm events that produce urban runoff
include flow from residential, commercial, or industrial activities involving the use of potable
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).
A. On the date the ordinance codified in this chapter takes effect, those BMPs which are listed
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
until the City Council shall adopt by resolution a guidebook prepared or recommended by the
City Engineer, categorizing development and BMPs for each category.
B. The City Engineer may from time to time revise the guidebook, and the City Council may
adopt these revisions by resolution.
C. No BMP other than a structural or treatment control BMP shall be used in any development
regulated under this chapter, unless the guidebook recommends that practice.
D. No structural or treatment control BMP may be used in any development regulated under this
chapter unless the guidebook recommends that practice.
17.95.070 Control of Erosion of Slopes and Channels.
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:
1. 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,
bioretention and/or rainfall harvest, and use.
A. A new single-family hillside home development shall include mitigation measures to:
I. Conserve natural areas;
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
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: E
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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-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; 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 mobilization 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.
1. 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 biofltered 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 determined 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 fill force on
January I, 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
)
COUNTY OF LOS ANGELES
) ss.
CITY OF SANTA CLARITA
)
I, Kevin Tonoian, City Clerk of the City of Santa Clarita, do hereby certify that the
foregoing Ordinance 15- was regularly introduced and placed upon its first reading at a regular
meeting of the City Council on the day of 2015, by the following vote, to wit:
AYES: COUNCILMEMBERS:
NOES: COUNCILMEMBERS:
ABSENT: COUNCILMEMBERS:
AND I FURTHER CERTIFY that the foregoing is the original of Ordinance 15- and
was published in The Signal newspaper in accordance with State Law (G.C. 40806).
CITY CLERK
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9.d
RESOLUTION NO. P15-02
A RESOLUTION OF THE PLANNING COMMISSION OF
THE CITY OF SANTA CLARITA RECOMMENDING THE CITY COUNCIL
APPROVE MASTER CASE NO. 15-007
(UNIFIED DEVELOPMENT CODE AMENDMENT 15-001),
AMENDING THE SANTA CLARITA UNIFIED DEVELOPMENT CODE
(LOW IMPACT DEVELOPMENT ORDINANCE)
THE PLANNING COMMISSION OF THE CITY OF SANTA CLARITA DOES HEREBY
RESOLVE AS FOLLOWS:
SECTION 1. FINDINGS OF FACT. The Planning Commission does hereby make the
following findings of fact:
A. The City of Santa Clarita is a permittee under the "Waste Discharge Requirements for
Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal
Watersheds of Los Angeles County, except those discharges originating from the City
of Long Beach MS4," issued by the California Regional Water Quality Control
Board --Los Angeles Region, (Order No. R4-2012-0175) which also serves as an
NPDES Permit under the Federal Clean Water Act (NPDES No. CAS004001), as
well as Waste Discharge Requirements under California law (the "Municipal NPDES
permit");
B: The Municipal MS4 permit (NPDES No. CAS004001) requires permittees to develop
and implement a Low Impact Development (LID) Ordinance;
C. Urbanization has led to increased impervious surface areas resulting in increased
water runoff causing the transport of pollutants to downstream receiving waters;
D. LID is widely recognized as a viable approach to managing the quantity and quality
of stormwater and non-stormwater runoff by setting standards and practices to
maintain or restore the natural hydrologic character of a developed site, reduce runoff
from the site, improve water quality, and provide groundwater recharge;
E. It is the intent of the City of Santa Clarita to amend the current Standard Urban
Stormwater Mitigation Plan (SUSMP) requirements by providing stormwater and
rainwater LID strategies for specific development and redevelopment projects as
defined under "Applicability." Where there are conflicts between this LID Ordinance
and previously adopted SUSMP Manuals, the standards in this LID Ordinance shall
prevail;
F. The City of Santa Clarita's proposed project consists of Unified Development Code
Amendment (UDCA) 15-001 to update the zoning code to implement LID
requirements while ensuring consistency with the General Plan;
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Master Case 15-007
Resolution
April 7, 2015
Page 2 of 6
G. The project was advertised in The Signal newspaper on February 24, 2015 for a
public hearing to be held on March 17, 2015, in accordance with the City's noticing
requirements. The hearing was to be held at City Hall, 23920 Valencia Boulevard,
Santa Clarita, at 6:00 p.m. Prior to that meeting, it was determined that there would
be a lack of quorum of the Planning Commission for that meeting and the item could
not be heard at that time.
H. The Planning Commission held a duly -noticed public hearing on April 7, 2015, in
accordance with the City's noticing requirements. The project was re -advertised in
The Signal newspaper on March 17, 2015, for a public hearing to be held on April 7,
2015. The hearing was held at City Hall, 23920 Valencia Boulevard, Santa Clarita, at
6:00 p.m.;
I. At this public hearing the Planning Commission received staff's presentation
summarizing the proposed project, opened the public hearing, received public
testimony regarding the project, provided comments to staff, and closed the public
hearing. Staff presented the necessary approval documents (resolution and associated
attachments), and the Planning Commission took action on the resolution of
recommendation to the City Council;
J. Based upon staff presentations and reports, and public comments and testimony, the LL
Planning Commission finds that Master Case 15-007 will not adversely affect the
health, peace, comfort, or welfare of persons residing in the area; nor will the project
jeopardize, endanger or otherwise constitute a menace to the public health, safety, or N
general welfare; and c
K. The location of the documents and other materials that constitute the record of
proceedings upon which the decision of the Planning Commission is based for the
Master Case No. 15-007 project file is with the Community Development
Department; the record specifically is in the custody of the Director of Community
Development.
SECTION 2. CALIFORNIA ENVIRONMENTAL QUALITY ACT FINDINGS. Based
upon the Notice of Exemption prepared for the project, the Planning Commission recommends
the City Council hereby find as follows:
A. A Notice of Exemption for this project was prepared in compliance with the
California Environmental Quality Act (CEQA);
B. This project is exempt from the provisions of CEQA per Article 19: Categorical
Exemptions,. Section 15308: Actions by Regulatory Agencies for Protection of the
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Master Case 15-007
Resolution
Apt it 7, 2015
Page 3 of 6
Environment, Class 8. A Class 8 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;
C. The documents and other materials that constitute the record of proceedings upon
which the decision of the Planning Commission is based is the Master Case 15-007
project file and that this project file is located within the Community Development
Department and is in the custody of the Director of Community Development; and
D. The Planning Commission, based upon the findings set forth above, hereby finds
the Notice of Exemption for this project has been prepared in compliance with
CEQA.
SECTION 3. GENERAL FINDINGS FOR MASTER CASE NO. 15-007. Based on the
foregoing facts and findings for Master Case No. 15-007, the Planning Commission recommends
the City Council hereby find as follows:
A. The proposal is consistent with the General Plan;
The project is consistent with the General Plan because the proposed LID
Ordinance codifies a number of General Plan policies and objectives. Specifically,
the Conservation and Open Space Element of the General Plan dictates that the
City limit disruption of natural hydrology by reducing impervious cover,
increasing on-site infiltration, and managing stormwater runoff at the source
(Objective CO 4.3). The proposed ordinance is also consistent with Conservation
and Open Space Policy CO 3.6.2, by reducing impervious surfaces and providing
more natural vegetation to enhance microclimates and provide habitat. This is
achieved by increasing vegetated areas to allow surface water infiltration and
drainage in lieu of curbed landscapes.
B. The proposal is allowed within the applicable underlying zone and complies with
all other applicable provisions of the Unified Development Code (UDC);
The proposed LID Ordinance would not change the character or nature of
development throughout the city but would allow the established land use patterns
to continue, therefore supporting the provisions of the UDC.
C. The proposal will not endanger, jeopardize, or otherwise constitute a hazard to the
public convenience, health, interest, safety, general welfare, or be materially
detrimental or injurious to the improvements, persons, property, or uses in the
vicinity and zone in which the property is located; and
Nothing contained in the proposed LID Ordinance would endanger, jeopardize, or
otherwise constitute a hazard to the public because the proposed ordinance does not
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Master Case 15-007
Resolution
April 7, 2015
Page 4 of 6
result in the disturbance of land or the physical development of any property and
would be consistent with the provisions of the UDC and General Plan.
D. The proposal is physically suitable for the site.
The proposed LID Ordinance .is a document that does not supersede, but rather
enacts the provisions of the General Plan. The proposed LID Ordinance does not
propose to change zoning or land use. A similar LID Ordinance is currently in place
for the unincorporated Los Angeles County areas served by the County of Los
Angeles.
SECTION 4. ADDITIONAL FINDINGS FOR UNIFIED DEVELOPMENT CODE
AMENDMENT 15-001. Based upon the foregoing facts and findings for Unified Development
Code Amendment 15-001, the Planning Commission recommends the City Council hereby find
as follows:
A. The amendment is consistent with the adjacent area, if applicable;
B. The amendment is consistent with the principles of the General Plan;
C. Approval of the amendment will be in the interest of public health, convenience,
safety, and general welfare and in conformity with good zoning practice;
D. The amendment is consistent with other applicable provisions of this code; and `
N
E. The amendment is necessary to implement the General Plan and/or that the public
convenience, the general welfare or good zoning practice justifies such action. N
The proposed LID Ordinance codifies and implements all provisions of the General
Plan and would therefore be consistent with the areas adjacent to the plan area. The
project is consistent with the General Plan because it would carry out a number of
General Plan policies and objectives. The proposed LID Ordinance creates
development standards that would enact the provisions of the General Plan, and
affect the aesthetic quality of the planning area upon the approval of development
projects that are consistent with the development standards detailed within the code.
The standards do not address California Building Code requirements or subdivision
requirements and would be consistent with all other provisions of the UDC. The
Conservation and Open Space Element of the General Plan dictates the City
promote on-site stormwater infiltration through design techniques such as pervious
paving, draining runoff into bioswales or properly designed landscape areas,
preservation of natural soils and vegetation, and limiting impervious surfaces.
Further, the Conservation and Open Space Element sets policies to integrate
detention and retention basins into the landscape design of development projects as
well as reduce the amount of pollutants entering the Santa Clara River and its
tributaries by capturing and treating stormwater runoff at the source. The approval
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Master Case 15-007
Resolution
April 7, 2015
Page 5 of 6
of the LID Ordinance would result in a document that would require future
development and redevelopment to implement low impact development design
consistent with the intent of the General Plan and would be justified by serving the
general welfare of the public.
SECTION 5. NOW, THEREFORE, BE IT RESOLVED, by the Planning Commission
of the City of Santa Clarita, California, as follows:
Adopt Resolution P15-02, recommending the City Council approve Master Case No. 15-
007, which includes Unified Development Code Amendment 15-001, consisting of the
Revisions to Chapter 17.95 of the Unified Development Code (Exhibit A)
SECTION 6. The Planning Commission Secretary shall certify to the adoption of this
Resolution and certify this record to be a full, complete, and correct copy of the action taken.
Packet Pg. 238
Master Case 15-007
Resolution
April 7, 2015
Page 6 of 6
PASSED, APPROVED, AND ADOPTED this 7'h day of April, 2015.
7�
- Q -, DIANE TRAUTMAN, CHAIRPERSON
PLANNING COMMISSION
A rrccT.
STATE OF CALIFORNIA )
COUNTY OF LOS ANGELES ) ss
CITY OF SANTA CLARITA )
9.d
I, Jeff W. Hogan, Planning Commission Secretary of the City of Santa Clarita, do
hereby certify that the foregoing Resolution was duly adopted by the Planning Cominission of —'
the City of Santa Clarita at a regular meeting thereof, held on the 7`h of April, 2015, by the
following vote of the Planning Commission:
AYES: COMMISSIONERS: BURKHART, EICHMAN, HEFFERNAN, OSTROM,
TRAUTMAN
NOES: COMMISSIONERS:
ABSENT: COMMISSIONERS:
S:\CD\CURREN71!2015115-007 (ZCA 15-001 for LID Ordinance) TC Resolution 15-02.doe
ION SECRETARY
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