1.
Some site characteristics and uses may generate specific pollutants
that are not addressed solely through implementation of the stormwater
quality measures identified in SDC 4.3.110. The site characteristics
and uses in this chapter have been identified as potential sources
for chronic loadings or acute releases of pollutants such as oil and
grease, toxic hydrocarbons, heavy metals, toxic compounds, solvents,
abnormal pH levels, nutrients, organics, bacteria, chemicals, and
suspended solids. This appendix presents source controls for managing
these pollutants at their source.
2.
Industrial facilities may be subject to additional requirements through
State of Oregon issued NPDES permits or as outlined in Oregon Administrative
Rules (OAR) 340 Division 041.
3.
Springfield Municipal Code 4.372 lists prohibited discharges to the
City's storm sewer system. The City has used these standards
in the development of the listed source controls so stormwater discharges
can better meet these criteria. The implementation of this chapter
is in addition to the applicable water quality, flow control, and
flood control requirements.
4.
Applicants may propose alternatives to the source controls identified
in this chapter. Proposal of an alternative source control or alternative
design element will require an additional review process and may delay
issuance of related building or public works permits.
1.
As provided in SDC 4.3.110(C)(8), development that includes any of
the following uses and characteristics are subject to the design methodologies
of this chapter:
a.
Fuel Dispensing Facilities and Surrounding Traffic Areas (Section
C)
b.
Above-Ground Storage of Liquid Materials (Section D)
c.
Solid Waste Storage Areas, Containers, and Trash Compactors (Section
E)
d.
Outdoor Storage of Bulk Materials (Section F)
e.
Material Transfer Areas/Loading Docks (Section G)
f.
Equipment and/or Vehicle Washing Facilities (Section H)
g.
Covered Vehicle Parking Areas (Section I)
|
Applicants are required to address all of the site characteristics
and uses listed in Sections (C) through (I). For example, if a development
includes both a fuel dispensing area and a vehicle washing facility,
the source controls in both Sections (C) and (H) will apply.
|
2.
Source Control Goals and Objectives.
a.
The specific source control standards are based on the following
goals and objectives:
i.
Prevent stormwater pollution by eliminating pathways that may introduce
pollutants into stormwater.
ii.
Protect soil, groundwater and surface water by capturing acute
releases and reducing chronic contamination of the environment.
iii.
Direct wastewater discharges (including wash water) to a sanitary
sewer system.
iv.
Direct areas that have the potential for acute releases or accidental
spills, and are not expected to regularly receive flow or require
water use (such as covered fuel islands or covered containment areas),
to an approved method of containment or destination.
v.
Safely contain spills on site, avoiding preventable discharges to
sanitary sewer facilities, surface water bodies, or underground injection
control structures (UICs).
vi.
Emphasize structural controls over operational procedures. Structural
controls are not operator dependent and are considered to provide
more permanent and reliable source control. Any proposals for operation-based
source controls need to describe the long-term viability of the maintenance
program.
3.
Signage.
a.
Informational signage is required for certain site uses and activities
that may pollute stormwater. Signage addresses good housekeeping rules
and provides emergency response measures in case of an accidental
spill. Required spill response supplies must be clearly marked, located
where the signage is posted (or the location of the supplies must
be clearly indicated by the signage), and must be located near the
high-risk activity area. Required spill response supplies, such as
absorbent material and protective clothing, should be available at
all potential spill areas. Employees must be familiar with the site's
operations and maintenance plan and proper spill cleanup procedures.
b.
All signage must conform to the standards described below. Additional
signage for specific activities is noted in applicable Sections C
through I.
c.
Signs must be 8.5 inches x 11 inches or larger and located and plainly
visible from all activity areas. More than 1 sign may be needed to
accommodate larger activity areas. Signs must be water-resistant and
include the following information:
1.
Fuel dispensing facilities include areas where fuel is transferred
from bulk storage tanks to vehicles, equipment, and/or mobile containers
(including fuel islands, above ground fuel tanks, fuel pumps, and
the surrounding pad). This applies to large-sized gas stations as
well as single-pump fueling operations.
2.
Cover.
a.
The fuel dispensing area must be covered with a permanent canopy,
roof, or awning so precipitation cannot come in contact with the fueling
activity areas. Rainfall must be directed from the cover to an approved
stormwater destination.
b.
Covers 10 feet high or less must have a minimum overhang of 3 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated fueling activity area/pad it is to cover.
c.
Covers higher than 10 feet must have a minimum overhang of 5 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated fueling activity area/pad it is to cover.
3.
Pavement.
a.
A paved fueling pad must be placed under and around the fueling activity
area with asphalt or concrete and must meet all applicable building
code requirements.
b.
Sizing of the paved areas must be adequate to cover the activity
area, including placement and number of the vehicles or pieces of
equipment to be fueled by each pump.
c.
Fuel pumps must be located a minimum of 7 feet from the edge of the
fueling pad.
4.
Drainage.
a.
The paved area beneath the cover must be hydraulically isolated through
grading, berms, or drains. This will prevent uncontaminated stormwater
from running onto the area and carrying pollutants away.
b.
Drainage from the hydraulically isolated area must be directed to
an approved City sanitary sewer system, or authorized pretreatment
facility.
c.
Surrounding runoff must be directed away from the hydraulically isolated
fueling pad to a stormwater destination that meet all stormwater management
practices of the Springfield Development Code and other applicable
code requirements.
6.
Spill Control Manhole.
a.
A spill control manhole must be installed on the discharge line of
the fueling pad (before the domestic waste line tie-in).
b.
The tee section must extend 18 inches below the outlet elevation,
with an additional 3 feet of dead storage volume below the tee to
provide storage for oil and grease.
c.
The total containment volume must be no less than 110 percent the
volume of the largest container or 10 percent of the total volume
of product stored, whichever is larger.
d.
The manhole must be located on private property.
7.
Shut-Off Valves.
a.
Shut-off valves are required to protect the City sewer systems or
on-site infiltration facilities of spill risks from chemicals and
other constituents that provide a danger for wide spread contamination,
system damages or risk to the public health. Manual shut-off valves
must not be permitted unless a request for an adjustment is approved
by the City.
b.
Shut-off valves will be required in the following situations:
i.
Site or activity areas where corrosives or oxidizers are used or
stored (for example, concentrated acids are corrosives having a pH
of less than or equal to 5.0 and bases such as sodium or ammonium
hydroxide having a pH of greater than or equal to 12.0, common oxidizers
are hydrogen peroxide and bleach); or
ii.
Substances which are water soluble or float on water; or
iii.
Solvents and petroleum products.
c.
Traffic pathways that surround the fueling pad, also designated as
high-use/high-risk areas, will require a shut-off valve on the storm
drainage system.
i.
Valves installed on storm drainage systems must be installed downstream
of all private stormwater quality facilities to accommodate spill
containment.
ii.
These valves should be left open to facilitate stormwater flows
during normal conditions, and immediately closed in the event of a
spill.
iii.
The switch or handle to operate the shut-off valve must be clearly
marked and accessible, and identified on the signage at the fuel dispensing
area. In the event of a spill the valve must remain closed until all
spilled fuel and residue has been properly removed and disposed of.
d.
Fueling pads will require a shut-off valve downstream of the spill
control manhole.
i.
Valves installed on sanitary sewer systems must be installed before
the domestic waste line tie-in.
ii.
These valves must automatically revert to the closed position.
iii.
These valves must be kept closed, and opened only to allow incidental
drainage activities that do not pose to be a threat or risk to the
destination system.
e.
Shut-off valves must be located on private property and downstream
of the exposed area's collection system.
i.
All valves must be installed and maintained as per manufacturer's
recommendations. For more information about shut-off valves and associated
valve boxes, contact Building and Permit Services at 541-682-5086.
8.
Additional Requirements.
a.
Installation, alteration, or removal of above-ground fuel tanks larger
than 55 gallons, and any related equipment, are subject to additional
permitting requirements by the Springfield-Eugene Fire Marshal's
Office. For technical questions and permitting, call the Fire Marshal's
Office Permit Center at 541-682-5411, or visit them at Permit and
Information Center, 99 W. 10th Avenue, Eugene, OR 97401.
b.
Bulk fuel terminals, also known as tank farms, will require the following:
i.
Secondary containment equal to 110 percent of the product's
largest container or 10 percent of the total volume of product stored,
whichever is larger.
ii.
A separate containment area for all valves, pumps and coupling
areas with sub-bermed areas either in front of or inside the main
containment areas. These sub-bermed areas are required to have rain
shields and be directed to a City sanitary sewer destination that
meets all applicable code requirements if no City sanitary sewer facility
is available, drainage must be directed to a temporary holding facility
for proper disposal.
iii.
An impervious floor within all containment areas. Floors must
be sealed to prevent spills from contaminating the groundwater.
iv.
Truck loading and off-loading areas. These areas must follow
cover, pavement, drainage, spill control, and shut-off valve requirements
identified for fuel dispensing facilities.
v.
Shut-off valves installed for the drainage of the tank yard, must
be installed downstream of the drainage system of the primary containment
area, and kept closed. Valves installed for the drainage of the truck
pad and sub-bermed containment areas must be installed on the sanitary
sewer line downstream of the spill control manhole.
vi.
A batch discharge authorization before draining a containment
area. This authorization will determine appropriate disposal methods,
identify pretreatment requirements (if applicable), and authorize
the discharge. Pretreatment may be required for oil and grease removal,
and testing may be required to establish the specific characteristics
of the discharge.
c.
Underground fuel tanks less than 4,000 gallons in size are subject
to additional permitting requirements by Oregon's Department
of Environmental Quality (DEQ) and tanks larger than 4,000 gallons
are referred to the Federal Environmental Protection Agency (EPA).
For technical questions and permitting, call DEQ's NW Region
main office at 1-800-844-8467 and ask for the Underground Storage
Tank Permitting Department.
1.
Above-ground storage of liquid materials include places where exterior
storage (either permanent or temporary) of liquid chemicals, food
products, waste oils, solvents, or petroleum products in above-ground
containers, in quantities of 50 gallons or more exist.
2.
Containment.
a.
Liquid materials must be stored and contained in such a manner that
if the container(s) is ruptured, the contents will not discharge,
flow, or be washed into a receiving system.
b.
A containment device and/or structure for accidental spills must
have enough capacity to capture a minimum of 110 percent of the product's
largest container or 10 percent of the total volume of product stored,
whichever is larger. Containers, such as double-walled containers,
with internal protection are considered to meet this requirement.
3.
Cover.
a.
Storage containers (other than tanks) must be completely covered
to prevent stormwater contact. Runoff must be directed from the cover
to a stormwater destination that meets all applicable code requirements.
b.
Covers 10 feet high or less must have a minimum overhang of 3 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated activity area.
c.
Covers higher than 10 feet must have a minimum overhang of 5 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated activity area.
4.
Pavement.
a.
All above ground storage of liquid material must occur in paved areas.
The storage area must be paved with asphalt or concrete and must meet
all applicable building code requirements. Sizing of the paved areas
must be adequate to cover the area intended for storage.
5.
Drainage.
a.
All paved storage areas must be hydraulically isolated through grading,
berms, or drains to prevent uncontaminated stormwater run-on to a
storage area.
b.
Covered storage areas:
i.
Significant amounts of precipitation are not expected to accumulate
in covered storage areas, and drainage facilities are not required
for the contained area beneath the cover.
ii.
If the applicant elects to install drainage facilities, the
drainage from the hydraulically isolated area must be directed to
a sanitary sewer destination that meets all applicable code criteria.
c.
Uncovered storage areas with containment:
i.
Water will accumulate in uncovered storage areas during and after
rain. Any contaminated water cannot simply be drained from the area.
It must be collected, inspected, and tested at the expense of the
property owner before proper disposal can be determined.
ii.
Some type of monitoring may also be needed to determine the
characteristics and level of contamination of the stormwater.
d.
All discharges to the sanitary sewer system must be considered batch
discharges and must require approval and meet applicable code requirements.
i.
Pretreatment requirements must be set as part of the discharge approval
process, based on the types and quantities of material to be discharged.
ii.
A discharge evaluation must be performed before connection to
a sanitary sewer facility.
iii.
Testing may be required to establish characteristics of the
sanitary sewer or contaminated stormwater and to verify that local
discharge limits are not exceeded. MWMC illicit discharge staff can
be contacted to start this process.
1.
Solid waste storage areas, containers, and trash compactors include
outdoor areas with 1 or more facilities that store solid waste (both
food and non-food waste) containers.
a.
One- and two-family residential solid waste storage areas, containers,
and trash compactors are exempt from this code subsection.
b.
Solid waste includes both food and non-food waste or recycling. Solid
waste containers include compactors, dumpsters, compost bins, grease
bins, recycling areas, and garbage cans.
c.
Debris collection areas used only for the storage of wood pallets
or cardboard is excluded from these requirements.
d.
The following site uses and activities include all commercial and
industrial development with facilities that store solid wastes, both
food and non-food.
i.
Outdoor solid waste storage areas.
ii.
Multifamily residential sites if a shared trash collection area
is proposed.
iii.
Activity areas used to collect and store refuse or recyclable
materials, such as can or bottle return stations and debris collection
areas.
iv.
Facilities whose business is to process and/or recycle wood
pallets or cardboard.
2.
Design.
a.
For approval of solid waste storage and handling activity areas in
the City of Springfield, the following design requirements will apply.
See below for a clarification of each requirement:
|
Activity/Use
|
Requirements
| |||
|---|---|---|---|---|
|
Cover
|
Pavement
|
Hydraulicly Isolated
|
Sanitary Sewer Drain
| |
|
Multi Residential (with shared trash areas)
|
X
|
X
|
X
|
X
|
|
Commercial
|
X
|
X
|
X
|
X
|
|
Industrial
|
X
|
X
|
X
|
X
|
|
Compactors (regardless of use)
|
X
|
X
|
X
|
X
|
|
Can and Bottle Return Stations
|
X
|
X
|
X
|
X
|
3.
Cover.
a.
A permanent canopy, roof, or awning must be provided to cover the
solid waste storage activity area and must be constructed to cover
the activity area so rainfall cannot come in contact with the waste
materials being stored. The cover must be sized relative to the perimeter
of the hydraulically isolated activity area it is to cover. Runoff
must be directed from the cover to a stormwater destination that meets
all applicable code requirements.
Any bulk materials storage location that is not completely enclosed
by a roof and sidewalls is an outdoor storage area.
1.
Bulk Materials Categories.
a.
Bulk materials are separated into 3 categories based on risk assessments
for each material stored: high-risk, low-risk, and exempt.
|
High-Risk Materials
|
Low-Risk Materials
|
Exempt Materials
|
|---|---|---|
|
• Recycling materials with potential effluent
• Corrosive materials (e.g. lead-acid batteries) •
Storage and processing of food items
• Chalk/gypsum products
• Feedstock/grain
• Material by-products with potential effluent
• Asphalt
• Fertilizer
• Pesticides
• Lime/lye/soda ash
• Animal/human wastes
• Treated Lumber
|
• Recycling materials without potential effluent
• Scrap or salvage goods
• Metal
• Sawdust/bark chips
• Sand/dirt/soil (including contaminated soil piles)
• Material by-products without potential effluent
• Unwashed gravel/rock
• Composting Operations
|
• Washed gravel/rock
• Finished lumber
• Plastic products (hoses, gaskets, pipe, etc.)
• Clean concrete products (blocks, pipe, etc.)
• Glass products (new, non-recycled)
|
2.
Cover.
a.
Low-risk materials must be covered with a temporary plastic film
or sheeting at a minimum.
b.
High-risk materials are required to be permanently covered with a
canopy or roof to prevent stormwater contact and minimize the quantity
of rainfall entering the storage area. Runoff must be directed from
the cover to a stormwater destination that meets all applicable code
requirements.
c.
Covers 10 feet high or less must have a minimum overhang of 3 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated activity area.
d.
Covers higher than 10 feet must have a minimum overhang of 5 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated activity area.
4.
Drainage.
a.
Low-risk material storage areas are allowed in areas served by standard
stormwater management systems. However, all erodible materials being
stored must be protected from rainfall.
b.
If materials are erodible, a structural containment barrier must
be placed on at least 3 sides of every stockpile to act as a barrier
to prevent uncontaminated stormwater from running onto the storage
area and carrying pollutants away.
i.
If
the area under the stockpile is paved, the barrier can be constructed
of asphalt berms, concrete curbing, or retaining walls.
ii.
If
the area under the stockpile is unpaved, sunken retaining walls can
be used. The applicant must clearly identify the method of containment
on the building plans.
c.
For high-risk material storage areas, the paved area beneath the
structural cover must be hydraulically isolated through grading, structural
containment berms or walls, or perimeter drains to prevent runoff.
i.
Significant amounts of precipitation are not expected to accumulate
in covered storage areas, and drainage facilities are not required
for the containment area beneath the cover.
ii.
If the applicant elects to install drainage facilities, the
drainage from the hydraulically isolated area must be directed to
the City's sanitary sewer (with approval from the MWMC Illicit
discharge division) and must meet all applicable code criteria.
5.
Additional Requirements.
a.
Storage of pesticides and fertilizers may need to comply with specific
regulations outlined by the Oregon Department of Environmental Quality
(DEQ). For answers to technical questions, call DEQ's NW Region
main office at 1-800-844-8467.
b.
A sampling manhole or other suitable stormwater monitoring access
point may be required to monitor stormwater runoff from the storage
area. This may apply to certain types of storage activities and materials
or if an alternative source control is proposed. This requirement
complies with Springfield Development Code 4.3.110D, which requires
discharge to be treated. PW staff will review for applicability of
this requirement.
c.
Signage must be provided at the storage area if hazardous materials
or other materials of concern are stored. Signage must be located
so it is plainly visible from all storage activity areas. More than
1 sign may be needed to accommodate large storage areas.
d.
If the applicant elects to install drainage facilities to the City's
sanitary sewer system, a shut-off valve must be required for the structurally
covered storage area.
6.
Alternative Protection Measures.
a.
In lieu of covering mineral resource mining, recovery, stockpiling,
and processing operations and low-risk material storage areas receiving
land use approval, the applicant may propose alternative protection
measures that demonstrate that stormwater runoff from the site will
not contaminate adjoining properties, surface waters, and ground water
as part of their land use application.
1.
Material transfer areas/loading docks include areas that are either
interior or exterior to a building, designed to accommodate a commercial
truck/trailer being backed up to or into them, and used specifically
to receive or distribute materials to and/or from commercial trucks/trailers.
Includes loading/unloading facilities with docks, and large bay doors
without docks.
a.
These requirements also apply to all development proposing the installation
of new material transfer areas or structural alterations to existing
material transfer areas (e.g., access ramp regrading, leveler installations)
with the following characteristics:
c.
The requirements in this section do not apply to material transfer
areas or loading docks used only for mid-sized to small-sized passenger
vehicles and areas restricted by lease agreements or other regulatory
requirements to storing, transporting or using materials that are
classified as domestic use, for example, primary educational facilities
(elementary, middle or high schools), or buildings used for temporary
storage, and churches.
2.
Cover.
a.
The hydraulically isolated areas in front of loading docks are required
to be permanently covered with a canopy or roof to prevent stormwater
contact and to minimize the quantity of rainfall entering the loading
dock area. Runoff must be directed from the cover to a stormwater
destination that meets all applicable code requirements.
b.
Covers 10 feet high or less must have a minimum overhang of 3 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated activity area.
c.
Covers higher than 10 feet must have a minimum overhang of 5 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated activity area.
3.
Pavement.
a.
A paved material transfer area must be placed underneath and around
the loading and unloading activity area with asphalt or concrete that
meets all applicable building code requirements. This will reduce
the potential for soil contamination with potential impacts on groundwater
and will help control any acute or chronic release of materials present
in these areas.
4.
Drainage.
a.
Loading Docks:
i.
Drainage from the hydraulically isolated area must be directed to
a sanitary sewer that meets all applicable code requirements. Surrounding
runoff and drainage from the access ramp must be directed away from
the hydraulically isolated area to a stormwater destination that meets
all applicable requirements of the Springfield Development Code.
ii.
The requirement for the drainage from the hydraulically isolated
area of the loading dock to be directed to the City's sanitary
sewer, or authorized pretreatment facility may be waived if PW determines
there is no gravity sanitary sewer service available and an appropriately
sized, underground temporary storage structure (such as a catch basin
with no outlet or dead-end sump) is provided.
5.
Non-Gravity Option.
a.
Activity areas that cannot achieve gravity sanitary sewer service
may be allowed to install a pressurized (pumped) system. These types
of installations will require the following to be provided at the
time of building permit application:
b.
Pressurized system installations are considered "permanent equipment"
and deemed the property owner's liability in the event of system
failure or if the property becomes vacated.
c.
The Building and Permit Services will review all sump pump or sewage
ejector installations for compliance with Uniform Plumbing Code and
Oregon State Plumbing Specialty Code.
d.
Bay Doors and Other Interior Transfer Areas. Because interior material
transfer areas are not expected to accumulate precipitation, installation
of floor drains is not required or recommended. It is preferable to
handle these areas with a dry-mop or absorbent material. If interior
floor drains are installed, they must be plumbed to the City's
sanitary sewer facility or authorized pretreatment facility. Interior
transfer areas may not be sloped to drain to the exterior of the building.
e.
Bay doors and other interior transfer areas must be designed so that
stormwater runoff does not enter the building. This can be accomplished
by grading or drains. Interior surfaces may not drain or be washed
down to the exterior of the building.
6.
Signage.
a.
Signage must be provided at the material transfer area and must be
plainly visible from all surrounding activity areas.
7.
Additional Requirements.
a.
Bay doors and other interior transfer areas must provide a 10-foot
"no obstruction zone" beyond the entrance within the building. This
will allow the transfer of materials to occur with the truck or trailer
end placed at least 5 feet inside the building, with an additional
staging area of 5 feet beyond that. The "no obstruction" zone must
be clearly identified on the stormwater management plan and on the
building plan at the time of the building permit application. The
area must be identified at the facility by painting the "no obstruction
zone" with bright or fluorescent floor paint.
b.
Shut-off valves will be required under the following situations:
i.
Site activity areas that are exposed to corrosives or oxidizers that
can harm conveyance system components (such as battery acid).
ii.
Substances that do not settle or remain in 1 location, but are
capable of being dissolved in or float on top of water (such as oil
and grease). These substances can spread rapidly into downstream systems,
causing widespread impacts and difficult clean-up situations.
iii.
Substances that are known to infiltrate through soils and contaminate
groundwater.
c.
Valves located in material transfer areas are typically left open
to facilitate drainage during normal conditions, and immediately closed
in the event of a spill.
d.
Prior to transfer activities of harmful substances, the valves should
be closed and only re-opened after the transfer is complete. The shut-off
valves must be located on private property and downstream of the exposed
area's collection system.
1.
Equipment and/or vehicle washing facilities include designated equipment
and/or vehicle washing or steam cleaning areas, including smaller
activity areas such as wheel washing stations.
2.
Cover.
a.
The washing area must be covered with a permanent canopy or roof
so precipitation cannot come in contact with the washing activity
area. Precipitation must be directed from the cover to a stormwater
destination that meets all applicable code requirements.
b.
Covers 10 feet high or less must have a minimum overhang of 3 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated washing activity area it is to cover.
c.
Covers higher than 10 feet must have a minimum overhang of 5 feet
on each side. The overhang must be measured relative to the perimeter
of the hydraulically isolated washing activity area it is to cover.
3.
Pavement.
a.
A paved wash pad must be placed under and around the washing activity
area with asphalt or concrete that meets all applicable building code
requirements. Sizing of the paved area must adequately cover the activity
area, including the placement of the vehicle or piece of equipment
to be cleaned.
4.
Drainage.
a.
The paved area beneath the cover must be hydraulically isolated through
grading, berms, or drains to prevent uncontaminated stormwater from
running onto the area and carrying pollutants away.
b.
Drainage from the hydraulically isolated area must be directed to
the City's sanitary sewer, or authorized pretreatment facility.
c.
Surrounding runoff must be directed away from the hydraulically isolated
washing pad to a stormwater destination that meets all applicable
requirements of the Springfield Development Code.
5.
Oil Control.
a.
All vehicle and equipment washing activities will be reviewed for
needed oil controls to comply with the City's adopted plumbing
code and Metropolitan Wastewater Management Commission requirements
for pretreatment.
b.
The following design criteria are established for oil/water separators
discharging to a sanitary sewer facility:
i.
Washing Areas Protected with a Cover or Located Inside a Structure:
Baffled oil/water separators and spill control (SC-Type) separators
must not be allowed for use with equipment and/or vehicle washing
applications.
Note: activities and processes of a washing facility change
over time and the introduction of heat and surfactants may occur.
ii.
Coalescing plate separators must be designed to achieve 100
ppm non-polar oil and grease in the effluent from the peak flow generated
by the washing activity. Testing information must be submitted by
the manufacturer of the unit that supports the 100 ppm effluent standard
at the calculated flow rate. Standard flow from a 5/8 inch hose is
estimated to be 10 gpm. For specially designed washing units, check
the vendor specifications for maximum flow rates.
iii.
Any pumping devices must be installed downstream of the separator
to prevent oil emulsification.
iv.
Separator details must be shown on the building plans submitted
for permit, and must match manufacturer specifications and details,
including the unit flow rate, effluent water quality, and maximum
process flow rate.
c.
On-site wash recycling systems wash may be used for oil control as
long as they can meet effluent discharge limits for the City's
sanitary sewer system. A detail of the wash recycling system and vendor
specifications identifying effluent efficiencies must be submitted
as part of the building plans at the time of building permit application.
1.
Covered vehicle parking structures include enclosed buildings, not
including single-level covers such as canopies, overhangs, and carports,
used to cover parked vehicles.
2.
Drainage.
a.
Stormwater runoff from the top floor of a multi-level parking structure
must be directed to a stormwater destination that meets all water
quality requirements of the Springfield Development Code and any other
applicable code requirements.
b.
Drainage from lower floor of a multi-level parking structure is not
expected to accumulate significant amounts of precipitation runoff
and drainage facilities are not required for the lower floors.
c.
If the applicant elects to install drainage facilities, the drainage
from the lower floors must be directed to the sanitary sewer.
