xvEPA
                      United States
                      Environmental Protection
                      Agency
                      Office of Water
                      Washington, D.C.
EPA 832-F-99-038
September 1999
Combined  Sewer Overflow
Management Fact  Sheet
Pollution  Prevention
DESCRIPTION

This  fact  sheet describes the  use  of pollution
prevention best management practices  (BMPs).
These practices are intended to both reduce the
volume  of pollutants entering a combined sewer
system (CSS), and to help reduce the number of
combined  sewer  overflows (CSOs) that occur
during storm water runoff producing events.

Combined sewer systems (CSSs) are wastewater
collection systems designed to carry both sanitary
sewage and storm water runoff in a single pipe to a
wastewater treatment plant.   Combined  sewer
overflows occur during wet weather periods when
the  hydraulic  capacity  of the  CSS becomes
overloaded.  This  causes overflows at discharge
points within the CSS.  Substantial water quality
and habitat benefits can be achieved by keeping
pollutants out of the CSS, and  thus out of CSO
discharges. This can often be accomplished through
the  implementation  of a  pollution prevention
program. Pollution prevention involves the use of
materials, processes, and practices that reduce or
eliminate the creation of pollutants and waste at the
source.

Pollution prevention is broadly  applicable, and is
one of the Nine Minimum Controls (NMCs) every
CSS  community  is  expected to  implement.
Pollution  prevention  generally relies  on low
technology practices that  are applied by many
individuals  and   commercial   and  industrial
establishments. Successful programs should include
public education,  municipal participation, and
proper regulation. Examples include:

• Solid waste management
                     •  Waste reduction and recycling

                     •  Commercial/Industrial pollution prevention

                     •  Street cleaning

                     •  Catch basin maintenance

                     •  Water conservation

                     •  Fertilizer and pesticide control

                     •  Erosion and  sediment control at construction
                       sites

                     Many of these practices overlap those addressed in
                     other components  of  the  NMCs,  including:
                     operating and maintaining the CSS; maximizing
                     collection system storage and flow to wastewater
                     treatment  plants;  reviewing  and  modifying
                     pretreatment programs; and controlling solids and
                     floatables in CSO discharges.  A comparison the
                     efforts and relative cost of implementing pollution
                     prevention technologies is presented in Table 1.
                     These practices are further described in the sections
                     below:

                     Solid Waste Management

                     Solid waste  management  (SWM)  can  play an
                     important role in reducing the amount of litter and
                     pollutants that enter the  CSS. Successful SWM
                     programs must address issues of bulk waste disposal
                     (e.g. household appliances, batteries,  and tires),
                     illegal dumping by both businesses and residential
                     property owners, hazardous waste collection and
                     disposal, street debris  and animal waste removal.
                     Programs may also include banning or substituting

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               TABLE 1  A COMPARISON OF POLLUTION PREVENTION TECHNIQUES
 TECHNOLOGY
Implementation
    Effort
Relative Cost
Role of Public
  Education
  Required
Maintenance
 Solid Waste Management

 Waste Recycling and
 Reduction

 Commercial/Industrial
 Pollution Prevention

 Street Cleaning

 Catch Basin Maintenance

 Water Conservation

 Fertilizer and Pesticide
 Control

 Sediment and Erosion
 Control
      M

      M


      M


      M

      M

      L

      L


      M
     L

     L
     M

     M

     L

     L
     H

     H
     L

     L

     H

     H
     M

     M
     H

     H

     L

     L


     M
             HIGH: H
                   MODERATE: M
                                    LOW: L
products and packaging materials that do not readily
degrade in the environment.

Waste Reduction and Recycling

Waste  reduction   is  the  design,   purchase,
manufacture, or use of products and materials which
limit  the  amount   of  solid waste  generated.
Recycling  is the recovery  and reuse of waste
materials. Waste reduction and recycling reduce the
total  amount of  solid  waste generated by  a
community.  This helps  limit the amount of trash
that finds its way into the CSS.

In the  home,  reusing  and  recycling  common
materials such as plastic and paper reduces pollution
and   eliminates  the  need  for  disposal.     A
well-organized recycling program for homeowners
with clearly marked containers, established transfer
locations, and regular collection schedules can be
very effective in reducing the total amount of solid
waste produced.  For industry, waste reduction and
recycling can improve environmental compliance,
lower  accident  rates,  and   reduce  regulatory
liabilities, reporting requirements   and insurance
rate.   Waste reduction  and recycling  can  also
increase profits by reducing   the costs  of waste
disposal, handling, treatment, and the purchase of
                         raw materials.

                         Commercial and Industrial Pollution Prevention

                         Commercial and industrial establishments contribute
                         large  amounts of pollutants to  CSSs.   These
                         pollutants  originate  as  either industrial waste or
                         storm water runoff discharged directly to the CSS.
                         Adherence  to pretreatment  requirements, the
                         development  of  spill   control  plans, and the
                         prevention or minimization of industrial discharges
                         during wet weather periods can reduce the amount
                         of industrial  waste in CSOs.  Employing  best
                         management practices (BMPs) such as providing
                         temporary covers  for outside storage areas, using
                         rain-proof  dumpsters,     performing   vehicle
                         maintenance in covered bays, and maintaining good
                         housekeeping for all areas exposed to storm water
                         runoff, is important.   Other examples of BMPs to
                         prevent commercial and industrial pollution include
                         the installation of oil and grease traps in catch basins
                         (inlet chambers which provide access for runoff to
                         enter  the  CSS)   that  service  commercial and
                         industrial areas, and the use of covered areas and/or
                         reverse berms to  redirect runoff away  from truck
                         and railcar load/offload areas. When coordinated in
                         an overall pollution prevention plan, these practices

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can reduce both storm water volume and pollutants
discharged to a CSS during wet weather periods.

Street Cleaning

Street  cleaning  can be  an  effective  means of
reducing the accumulation of street debris. Street
debris is typically composed of food and beverage
wrappers  and  containers,  paper and plastic bags,
leaves, and sand/soil. Frequent cleaning limits the
quantities of dirt, debris,  and pollutants including
floatables, entering the CSS  during wet weather
events.   Sweeping also contributes to improved
water quality by reducing nutrient, BOD, bacterial
and metal loads delivered to the CSS.

Catch Basin Maintenance

Regularly scheduled  catch   basin  cleaning  can
prevent  debris,  sediment, and  floatables  from
accumulating  in the CSS.   Cleaning  prevents
potential clogging of the basins, which helps both to
avoid localized  flooding  and to maintain basin
sediment trapping ability.  The available options for
catch basin cleaning are manual cleaning, vacuum
cleaning,  and  cleaning with eductor  equipment.
Catch basin cleaning is also beneficial to collection
system  performance because  it  reduces  the
likelihood of  fouling or  damaging  downstream
pumping  equipment,  and it  prevents  sediment
buildup that can reduce  capacity and accelerate
CSO events.

Water Conservation

Water  conservation can be  defined as practices,
techniques, and technologies that improve the
efficiency of  water use.    An  effective  water
conservation program helps  to reduce CSOs by
reducing sanitary flow. This  reduction provides a
net increase   in  CSS  collection  and treatment
capacity for storm water during storm events.

Fertilizer and Pesticide Control

Fertilizers and pesticides washed from the ground
surface  and transported  with runoff into CSSs
during wet weather events can be contained in CSO
discharges. Fertilizers, which contain high levels of
nitrogen  and  phosphorous,   contribute  to
eutrophication of receiving waters.  In addition,
pesticides are potentially toxic to aquatic life. While
the individual contribution  of pollutants  from a
homeowner's  lawn, the grounds  of a business
establishment, or a municipal park may be small, the
cumulative  impact  on  water quality  may  be
significant.  The control of urban fertilizer and
pesticide levels  involves convincing   residents,
institutions, and municipal departments to adhere to
handling  and  application  techniques  that  limit
pollutant runoff.   Integrated pest  management
(IPM) programs  that  provide  information  on
alternatives to traditional fertilizer, pesticide, and
herbicide practices are currently being developed
within local and state governments.

Sediment and Erosion Control

Sediment and erosion control practices can play an
important role in reducing  the volume of storm
water and the amount of sediment delivered to the
CSS during  wet weather periods.  Well-managed
soil retains rainwater, and tends to keep sediment on
site. In contrast, poorly-managed soil, particularly
at construction sites, produces  unnecessary runoff
and  increased  sediment loads.    Activities  that
accelerate erosion include:  removing vegetative
cover; compacting or disturbing the soil; changing
natural drainage patterns; and increasing the amount
of impermeable surfaces.

The impact of increased sediment and erosion on the
CSS can be substantial. System capacity is reduced
by the excess  storm water,  leading to larger and
more frequent overflows.  In addition,  sediment
often  clogs  catch  basins  and   contributes to
inefficient operation of the CSS. Receiving waters
are also impacted as sediment increases turbidity,
upsets natural habitat and  aquatic life,  and adds
undesirable  nutrients,  metals, and  other  toxic
substances.

APPLICABILITY

Pollution prevention prevention programs should be
applicable in all CSO communities.  By relying on a
combination of  public  awareness programs and
community initiatives, these programs can play a
significant role in reducing CSOs. and other toxic
substances.

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ADVANTAGES AND DISADVANTAGES

Solid Waste Management

The   illegal  disposal  of  household  trash  and
chemicals  is  a  major problem in  most  CSO
communities.   Public education is essential to
solving this problem.   In  addition  to  raising
awareness of waste disposal issues, programs must
provide direction to the general public. People need
accurate information on recyclable waste materials.
Clear and concise instructions for preparing all types
of household wastes, including bulk wastes,  for
curbside pickup or drop-off must be disseminated.
Maintaining convenient hours of operation for waste
drop-off facilities will make it easier for residents to
properly  dispose of waste  items.   Frequently
emptying municipal trash receptacles, so that they
remain empty and clean, will prevent spillover and
encourage their use. The stenciling of storm drain
catch basins serves to educate the public about the
connection between storm runoff and  receiving
waters, and the dangers of dumping waste, such as
paintbrush  residues and concrete truck washout,
into  CSS inlets.  To  prevent animal waste from
entering the CSS, municipalities can institute a so
called pooper-scooper regulation and place signs
near  popular  walking  trails  or common areas
reminding people to clean up after their pets.

Waste Reduction and Recycling

Like solid waste management, recycling relies on
voluntary cooperation.  Public education will be an
essential  part  of  any  successful recycling effort.
Recycling  involves   encouraging  the  reuse  of
materials in both household and industrial settings.
Many reusable substances,  such as motor oil and
cleaning products, require special storage containers
and recycling techniques.

Setting  a recycling  goal for the  community is
important.   However, it takes time for recycling
programs to become established and  to  have a
measurable  impact.  To  encourage participation
recycling must be made convenient.   Providing
reliable curbside collection may be the best way to
encourage household participation. Pick-ups should
occur on a regular schedule, as often as once a
week.  Drop-off centers where residents may leave
recyclable materials at scheduled times can also be
established.   Offices  can  contract  with  paper
recyclers for onsite pickup of waste paper and other
recyclables.

Commercial and Industrial Pollution Prevention

Pretreatment requirements  can be reviewed  and
modified to control the amount and characteristics
of industrial  waste entering the CSS.  Sewer use
ordinances,   rules,  and  regulations   can   be
implemented to  control pollutant concentrations,
and, in some instances, the timing of discharges to
the CSS. CSO communities can provide technical
assistance and incentives for pollution prevention to
commercial   and   industrial  establishments.
Additionally, CSO  communities can  implement
broad programs that encourage commercial  and
industrial establishments to participate in pollution
prevention  programs,  and  they can  recognize
successes.  These programs include  strategies for
reducing the volumes of industrial wastes generated
through: material substitution; process modification;
chemical  and  water  use  reductions;  sensible
chemical  storage;  spill  prevention,  and good
housekeeping.

Street Cleaning

Street sweeping services are  provided by either
municipal or contracted  personnel.   The overall
effectiveness of a  street  cleaning  program  is
primarily a function of the frequency and regularity
of the cleanings. The frequency of street sweeping
is determined by need, the number of miles to be
served, and local budget constraints.  Other factors
for consideration include climatic conditions (e.g.,
rainfall frequency and season),  the size of particles
captured  by  the cleaning,   and  street-parking
regulations.  Because parked cars prohibit the street
cleaner from removing curbside litter, enforcement
of parking regulations is essential.

Sweeping  programs  tend to be   implemented
city-wide, not just in areas  serviced  by  CSOs.
Budget  constraints  may require that  sweeping
efforts be timed to be most effective. Early spring
cleanings are essential in areas subject to winter salt,
sand, and cinder applications.   Late fall sweepings
are essential in areas with sustained winter rains. In

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general,  street  sweeping  provides  appreciable
aesthetic benefits that go well beyond CSO control.

Catch Basin Maintenance

Implementing a successful catch  basin cleaning
program requires a commitment to  regularly-
scheduled cleaning and maintenance.  Catch basins
should be cleaned whenever material deposited in
the bottom of the basin reaches a height greater than
one-third of the depth from the basin bottom to the
lowest opening into or out of the basin. Catch basin
cleaning is thought  to mitigate the "first flush"
effect, which occurs when  the initial major storm
water flow into a catch basin re-suspends deposited
material and flushes it out through the outflow pipe.
A study comparing the effect of different cleaning
schedules found that quarterly cleanings appear to
be the most effective in reducing pollutant loads.

Water Conservation

Water conservation programs should be combined
with  a  strong public  education component that
emphasizes the financial and environmental benefits
associated with water conservation and water  use
efficiency.  Water conservation tips can be sent to
customers in newsletters that accompany water bills.
Local ordinances can be  developed to ensure that
water  conservation  practices  are standardized.
Utilities  can  also   offer  technical  advice   and
incentives  to  customers  to  encourage water
conservation.

Fertilizer and Pesticide Control

Users must receive  instruction on how to safely
handle and properly  apply  fertilizer and pesticide
products.   Public  education  programs  should
emphasize that "more is  not better," and that  the
lowest effective dose listed  on the label for any  one
application should always be used. Care should also
be taken to  identify pests correctly so that  the
proper  pesticide is  selected,  and inappropriate
materials are not wastefully  applied.  Education
about alternative pest control measures can also be
valuable.   Information about  beneficial  insects,
proper planting dates, and companion  cropping
systems should be disseminated for consideration.
The   caretakers of  large  parcels of urban land,
including local  parks  departments  and  other
institutions,  should be encouraged to lead the way
and demonstrate the responsible use of fertilizers
and pesticides. Finally, the use of Class A biosolids
to replace or supplement synthetic  fertilizer  in
turfgrass  establishment  can  greatly reduce the
quantity of runoff and its pollutant content.

Erosion and Sediment Control

Soil erosion within the CSS  is most prevalent  in
open space areas, at construction  sites, and within
streambanks.  Open space is  largely comprised  of
lawns in residential areas, open areas at educational,
corporate  and   medical   institutions,   and
government-owned land,  including  parks.  The
practices  most suitable for lawns  and  parks are
maintaining   a  vegetative   cover  and,   where
applicable, using grassed drainageways and terraces
that hold the soil  in  place  and allow water  to
infiltrate on-site.

For construction sites, planning prior to disturbance
is essential. The planning should address controlling
erosion   by  preserving  existing  vegetation,
controlling sediment on site, and post construction
activities. The strategy is to spread and slow storm
water runoff when possible,  and to ensure that
concentrated flows do not erode drainageways. Silt
fences,  filter fabrics,  and   straw  wattles  can
effectively retain sediment on disturbed slopes.
Fabrics must be selected  with an appropriate  pore
size to ensure maximum sediment control for the
type of  soil  encountered.   Rock check  dams,
woodchip-filled bags, and hay bales can be effective
sediment traps in drainageways. Small onsite stilling
ponds, designed to slow runoff and allow settling,
can  also be effective.  Construction  entrance
protection is needed  to prevent tracking  of
sediments onto   public  streets  via  truck  tires.
Protection includes laying a woven geotextile fabric
across the entranceway and at least 50 feet into the
site.  Three-inch minus rock is then placed over the
fabric.  On  very large construction sites,  wheel
washes are often used as an  additional sediment
control  strategy.   Additionally,  environmentally-
oriented  landscaping,  mulching,  and seeding will
contribute to erosion and sediment control.  CSO
communities should consider the development  of
standards and recommended practices for sediment

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and erosion control to guide new development and
redevelopment projects.

IMPLEMENTATION

Solid Waste Management

Jefferson County, KY, has opened a permanent
center for the disposal of household chemicals, such
as paint thinners and solvents,  cleaning solutions,
lawn chemicals, and waste oils.  The center is called
AHaz Bin and operates two days per week on a year
round basis.  AHaz Bin has an annual operating
budget of $250,000.   During  1996,  AHaz Bin
collected approximately 68,040 kilograms (150,000
pounds)  of  household  chemicals from  2,080
households. More than 85 percent of the waste was
either recycled or used in fuel blending.

Waste Reduction and Recycling

Louisville, KY, provides garbage collection once a
week  and  conducts  a  simultaneous  recycling
program that collects newsprint, glass, plastics, and
tin  and aluminum cans.   The program collects
approximately 15.2 million kilograms (15,000 tons)
of material each year, of which 75-80 percent is
fiber.  The City has found a private contractor who
will  purchase  fibers  for  2  cents per kilogram
($25/per ton).   This money is used to offset costs
associated  with  all   aspects  of  solid  waste
management.

The Industrial Materials Exchange (IMEX) is an
element of the King County, WA, hazardous waste
management program, and has been active since
1989.  IMEX's goals are to conserve energy and
resources, and to  protect the environment by
helping  businesses  and  organizations   find
alternatives to the disposal of valuable materials or
wastes. IMEX has an annual operating budget of
$250,000, which is  used to  help  businesses find
markets  for   industrial  by-products,   surplus
materials, and wastes.  Potential wastes are reused
to the mutual benefit of the supplier of the surplus
material,  the user, and the environment.
Commercial and Industrial Pollution Prevention

As part of its outreach effort, The Rouge River
National Wet  Weather Demonstration Project in
Michigan initiated the Rouge Friendly  Business
Program.  The Program works with small business
owners to help them complete a facility management
self-assessment form.  The program then suggests
the implementation of source controls,  such as:
storage and disposal of non-hazardous materials,
grease handling, and managing outdoor work areas.
The Program recognizes and promotes businesses
which make the suggested changes and demonstrate
river-friendly pollution prevention practices. As of
June  1997, 17  businesses have been  officially
recognized.

Street Cleaning

New York City's street sweeping program cleans
just over 50 percent of the  city's 18,800  curb
kilometers (11,700 curb miles). Streets are cleaned
on a regular schedule that ranges between one and
three    sweepings    per   week.
Alternate-side-of-the-street parking regulations
support the sweeping  program.   There are  also
ordinances in  place which prohibit littering and
require property owners to clean  sidewalks and
gutters daily. Enforcement agents patrol commercial
areas and fine owners who fail to maintain sidewalks
and gutters.

South Portland, ME, utilizes contracted sweeping
services to sweep the entire 160 kilometers  (100
miles) of city roadways each spring. This process
yields  more than 1,500 cubic  meters (2,000 cubic
yards) of material annually. City  streets  are then
continually  maintained  by city personnel  and
equipment throughout the summer and fall months.
On average, an additional 750 cubic meters (1,000
cubic  yards) of debris is  picked up during this
period.

Catch Basin Maintenance

An in-depth study  of floatable discharges to New
York Harbor was  recently  completed.  The  final
report recommended that the City adopt a two year
cycle  for cleaning catch basins, which number well
over 100,000 city-wide. In trying to meet this goal,

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the City cleaned 63,500  catch  basins  in  1996.
Approximately 32,000 were scheduled cleanings,
and the remaining were the result of complaints
phoned   into   the  City's  Department   of
Environmental Protection.

Water Conservation

As part of its Water Smart Technology Program,
Seattle  Water in Washington  offered  technical
assistance and financial  incentives to commercial
customers to  encourage  installation  of   water
conservation technologies.  The financial incentives
included refunds of as much as 50 percent of the
installed cost for an approved conservation project.
Through June 1997, the incentive program spent
$1.2  million, and  has  seen   a   savings  of
approximately 0.9  MOD.   Seattle  Water also
created a toilet rebate program. The program offers
rebates of $100-$150 for each  fixture  replaced.
Through June 1997, the toilet program has spent
$1.4 million, and installed more than 8,000 fixtures
with an estimated water savings  of 0.8 MGD.  In
total, the programs have conserved approximately
1.7 MGD for the $2.6 million spent.

Fertilizer and Pesticide Control

The local hazardous waste program in King County,
WA, sponsors an annual Green Gardening Program.
The   program  focuses   on    integrated   pest
management (IPM).  Major program  components
include working with schools,  hosting tours  of
gardens grown with little  or no pesticides, and
holding workshops for nursery store staff, master
gardeners,  and professional grounds managers.
Nearly 2,000 people participated  in the various
activities in  1996, and 41  percent of participants
said they were very likely to adopt green gardening
methods.   Additionally,  the  Washington  State
University Cooperative  Extension promotes  the
Green Gardening Program in its weekly newspaper
column for ten weeks each spring.

Sediment and Erosion Control

The Louisville and Jefferson County Metropolitan
Sewer  District (MSD)  in Kentucky developed
erosion control standards for  the county.   The
standards  require   erosion  controls   (silt  fence
placement) to  be in  place  before  the soil  is
disturbed, and will stipulate that any site left 14 days
without activity be stabilized. Additionally, no more
than 500 linear meters  (1,500 linear feet) of earth
can be disturbed at one time.

In addition, the local governments of  Louisville
and  Jefferson County are working  together  to
reduce the generation of household and industrial
wastes.  The MSD modified  wastewater rates to
encourage industrial  water  conservation and
pretreatment. Additionally, an erosion control plan
is  now a required component  for construction
activities.  MSD  developed  a set  of minimum
requirements which can be easily inserted into most
construction  plans.    Recently,  MSD  offered
instruction in sediment  and  erosion   control  to
private design engineering firms  and  contractors
who frequently work on municipal projects and to
government employees involved in planning, design,
construction, and  inspection. Complementing that
work, the Department of Solid Waste Management
and Services (SWMS) has reduced the amount of
household waste entering local landfills by providing
separate  weekly  collections  for  recyclable and
compostable waste.  To further encourage  waste
reduction, SWMS has reduced residential garbage
collection from twice to once per week. Also, the
Jefferson  County Department of Environmental
Protection  and  Management  has   opened   a
permanent center for the disposal of household
hazardous  waste.   The  combined efforts have
yielded the  collection  of 170 million kilograms
(168,000 tons) of recyclable materials in 1996, the
recycling or reuse of more than 85 percent  of the
household hazardous waste brought to the center,
and  decreased  water demands from  a growing
population.

COSTS

Cost comparisons for the wide range of strategies
used for pollution prevention are difficult to make
without consideration of site-specific factors. The
following section  summarizes the range of costs
representative  of  each  pollution   prevention
technique:

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Solid Waste Management
Sediment and Erosion Control
Costs  vary  greatly  depending  on the  type  of
program  implemented   and  the  size  of  the
community.

Waste Reduction and Recycling

The  costs associated with municipal  recycling
programs are typically between one and two dollars
per household per month.  This estimate includes
expenses of 7.4 to 7.8 cents per kilogram ($75-80
per ton) to collect  the  recyclables.   However,
recyclables often generate $0.02-0.025 per kilogram
($20-25 per ton) in revenue.

Street Cleaning

Cost will depend on the frequency of cleaning, the
number of  cars  on  the street, the degree  of
enforcement of parking regulations, the volume of
litter,   and the types  of  labor  and machinery
employed.  Cost will also  depend on the landfill
tipping fees associated with the removed debris. The
reported costs of sweeping vary widely, but average
$62 per curb kilometer ($100 per curb mile).

Catch Basin Maintenance

The cost to clean catch basins can range  from $65
to $110 per basin,  depending on the type  of
equipment used.   This figure includes  machine
rental, fuel, and labor costs. The purchase cost for
vacuum trucks ranges from $150,000 to  $200,000
for trucks having a capacity of 7.6 to 12.2 cubic
meters (10 to 16 cubic yards) of material. Recent
technological  advances   have  produced   high
performance vacuum sweeping trucks that can also
clean  out catch basins.  Maintenance  costs are
estimated by a manufacturer to range from $12,500
to $15,000 per truck per year.  The cost estimate
does not include fuel, but reflects costs for routine
maintenance materials and mechanic-time.

Water Conservation

Costs  are closely   tied to  program   specifics.
Incentive  programs  average  a one-time cost  of
$0.25-0.50 cents per liter ($1 to $2 per gallon) of
water saved per day.
Blankets/Fencing

Netted erosion control blankets average $0.75 per
square meter ($0.65 per square yard) for straw and
$1.35 per square meter ($1.15 per square yard) for
coconut-based material (50 square meter/60 square
yard blankets). Tight-knit coconut fiber rolls, for
long steep  slopes,  average $2.40-4.20 per square
meter  ($2.00-3.50 per square  yard).  Synthetic
blankets average $4.80 per square meter ($4.00 per
square yard). Silt fences (with pocketed post slots)
are sold  by the  30.5  meter  (100 foot  roll),  with
prices  starting at $0.11 to $0.15 per linear meter
($0.35 to $0.50 per linear foot), uninstalled.

Vegetative  Controls

Vegetative controls include broadcast seeding and
hydroseeding.  Typical  costs for simple broadcast
seeding with an economical erosion control seed
mix  are $245-$620 per hectare ($100-$250 per
acre).  Commercial hydroseeding averages $1980-
$2470 per hectare  (800-$ 1000) per acre. The cost
of supplying any needed water to the site can result
in significant additional  costs.   Devices aimed at
keeping seed in  place during germination include
straw  mulch  ($2.00-$4.00 per bale)  and  straw
wattles ($4.25  per linear meter, or $1.30 per linear
foot).

Inlet Protection

Catch basin inlet protection can include inlet bags,
grate  wraps,  woodchip-filled  mesh bags,   and
rock/block/screens. Inlet  bags and  grate wraps
average $60-$75 per unit. Woodchip filter bags,
where available, average $2.75 per 25 centimeter by
75   centimeter  (10  inch  by  30  inch)  bag.
Rock/block/screen  average  $12-$ 15  per  inlet,
although most of this material can later be used for
construction purposes.

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Construction Entrance Protection

Woven geotextile fabric costs average $1.10-$2.30
per square  meter  ($0.90-$1.90 per square yard).
Three-inch  minus  rock costs average $6.50-$8.75
per meter  ($6.00-$8.00  per  yard)  plus delivery
charges.

REFERENCES

1.      Bryd, R. E., 1987. "A Storm Water-Borne
       Pollutant   Export  From  Turfgrass
       Established  on   Soils  Amended   with
       Composted Domestic Wastewater Sludges."
       Master's Thesis, Virginia Tech.

2.      New   York   City    Department    of
       Environmental Protection, 1995. City-Wide
       Floatables Study.  Prepared for the Bureau
       of Environmental Engineering, Division of
       Water Quality Improvement, by HydroQual,
       Inc.

3.      U.S.  EPA,   1992.      Storm   Water
       Management   for   Industrial
       A ctivities;Developing Pollution Prevention
       Plans  and Best  Management  Practices.
       EPA 832/R-92-006.
City of New York, New York
Eric Delva
Bureau of Clean Water
New  York  City Department of Environmental
Protection
96-05 Horace Harding Express Way
Corona, NY  11368

Rouge River Demonstration Project
Vyto Kaunelis
Wayne County Department of Environment
415 Clifford Street, 7th Floor
Detroit, MI 48226

City of South Portland, Maine
Jay Reynolds
City of South Portland Engineering Department
25 Cottage Road
South Portland, ME 04106

The mention of trade names or commercial products
does not constitute endorsement or recommendation
for  the use by the U.S. Environmental Protection
Agency.
4.      U.S.   EPA,   1992.      Storm   Water
       Management for Construction Activities;
       Developing Pollution Prevention Plans and
       Best Management Practices. EPA 832/R-
       92-005.

ADDITIONAL INFORMATION

Jefferson County Metro Sewer District
Dan Knowles
700 West Liberty Street
Louisville, KY 40203

King County, Washington
Dave Hancock
Department of Natural Resources, Water and Land
Resources Division, Drainage Services Section
700 5th Avenue,  Suite 2200
Seattle, WA 98104
             For more information contact:

             Municipal Technology Branch
             U.S. EPA
             Mail Code 4204
             401 M St., S.W.
             Washington, D.C., 20460
             Excellence In compliance through optlnal technical solutions
             MUNICIPAL  TECHNOLOGY BRAN(

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