Stormwater Awareness

Introduction

• UNC has a Stormwater Permit from the North Carolina Department of

Environment and Natural Resources (NCDENR)

• The permit requires “stormwater pollution awareness training for appropriate

faculty, staff, students, and volunteers”

• For more information you can find a copy of the University’s stormwater

permit at https://ehs.unc.edu/files/2015/09/permit_report_2013.pdf

What is Stormwater?

Stormwater…

•Is rain that doesn’t soak into the ground

•Is carried by drains and pipes through

campus until it discharges to the creek

•Can pick up pollutants as it runs over the

ground

•Does NOT go to the waste water

treatment plant

Introduction (continued)

Introduction (continued)

What pollutes stormwater?

• Oils and Grease

• Metals

• Nitrogen and Phosphorous

• Sediment

• Other Chemicals (pesticides, herbicides, etc.)

• Bacteria

What are the effects of

stormwater runoff?• Flooding

• Picture taken on Raleigh Street across from the Coker Arboretum during

rainstorm on August 27, 2008

What are the effects of stormwater runoff? (continued)

• Creates areas that are unsafe for recreation such as fishing, swimming,

and boating

What are the effects of stormwater runoff? (continued)

• Harms aquatic organisms

• Damage to commercial fisheries and tourism

Neuse River, NC(2003) An estimated 2

million fish killed due to low oxygen as

a result of polluted stormwater runoff.

What are the effects of stormwater runoff? (continued)

• Increased costs for drinking water treatment

• Jordan Lake is the main drinking water source for Cary, Apex, Morrisville,

and sections of Chatham and Wake Counties

Campus Drainage Areas

(Watersheds)

•A watershed is an area of land

that drains to a common outlet

•On main campus there are 5

different watersheds

•The majority of main campus

drains to three different areas

•Water within all of these

watersheds ends up in Jordan

Lake

North Campus-Battle Branch

Creek

The northern areas of campus drain to Battle Branch Creek located in

Battle Park behind the Forest Theatre.

Central Campus-Meeting of the

Waters CreekCentral campus drains to Meeting of the Waters creek which is visible

near the intersection of Bell Tower Drive and South Road before

entering a pipe and flowing underneath Kenan Stadium. This pipe

discharges below Boshamer Stadium in the Coker Pinetum.

South Campus- Meeting of the

Waters Creek

All stormwater runoff from campus eventually ends up in Jordan Lake!

Much of South Campus drains to a branch of Meeting of the Waters creek

located near the Dean Smith Center.

Storm Drain or Sanitary Sewer?

•There are two types of drains on campus

•STORM DRAINS go to the creek without treatment

•SANITARY SEWERS go to the wastewater treatment plant

•These two systems are completely separate of each other

Storm Drain or Sanitary Sewer? (continued)

•Some storm drains on campus have

UNC markers that say “No Dumping,

Drains to Creek” or “No Dumping,

Drains to Stream”

•Of the several thousand storm

drains on campus only a few

hundred have UNC drain markers

•The following slides describe

different categories of drains as well

of explanations of which system they

drain to (storm drain or sanitary

sewer)

•Inlets along roads, in parking lots, in

landscaped areas, in parking garages, and

on rooftops go to the storm drain system

Storm Drain or Sanitary Sewer? Storm Drain Inlet

•Though it isn’t marked, this is a stormwater drain- that

goes directly to the creek

•Usually if a drain is located outside, it is a stormwater

drain and water entering it is not treated before being

discharged to the creek

Storm Drain or Sanitary Sewer? Outdoor Trench

Drain

•Manhole covers lead to underground pipes

•Some are labeled “Storm Drain” or “Sanitary Sewer”

•Unfortunately, many manholes on campus are

mislabeled

•Call EHS before disposing of anything into a manhole

that you haven’t previously checked

Storm Drain or Sanitary Sewer? Manhole

•In all newer buildings floor drains are connected to the

sanitary sewer system

•However, in older buildings some floor drains may be

connected to the stormwater system

•Do not dispose of anything into floor drains located in older

buildings

Storm Drain or Sanitary Sewer? Indoor Floor Drain

•This sink is located in a housekeeping closet

•Housekeeping sinks drain to the sanitary sewer

•These sinks are designed for buckets don’t have to

be lifted to dump the water

•Buckets of wash water should not be disposed of

outside

•If you don’t have an easy way to dispose of wash

water, contact EHS

Storm Drain or Sanitary Sewer? Housekeeping Sink

•Toilets are connected to the sewer system

•Anything flushed down the toilet goes to the

wastewater treatment plant

•Do not dispose of garbage or chemical waste into

toilets

Storm Drain or Sanitary Sewer? Toilets

Recognizing and Preventing

Stormwater PollutionGeneral Rule- only rain can go into the stormwater system. If you wouldn’t

want to swim in it, don’t put it in the drain. Intentional disposal into storm

drains, cross connections with other piping systems, improper storage of

chemicals, and chemical spills can all have negative impacts on water

quality and in many cases are illegal.

Illegal Disposal

OK in Stormwater Drains:

YES NO

Rainwater Chemicals

Tap Water Soap and Detergent

Soil, Leaves, Grass Clippings

Garbage

Sewage

Paint

It is not OK to dispose of paint,

chemicals, or solid waste into the

storm drain. If you have paint or

chemicals you need to dispose of,

or see anyone disposing of

anything into a storm drain contact

EHS at 962-5507.

Illegal Disposal (continued)

Contractors and UNC employees working in the area were spoken to and

reminded of the correct ways to dispose of paint. Dried paint was cleaned up

as much as possible. (11/21/2007)

Cross ConnectionsA cross connection occurs when a drain or pipe is improperly connected to the

storm drain system.

The water discharge for this washing machine was routed through a small pipe

that went through the wall of an air handler. The water then dumped into a drain in

an outdoor air intake pit that was connected to the stormwater system, resulting in

the water getting to the creek. This water should have been routed to the sewer

system when the washing machine was installed.

Upon discovery, this washing machine was immediately

taken out of service. (11/11/2008)

The following pictures are from the Ram’s Head loading dock located on the

ground floor of the Rams Head parking deck

Cross Connections (continued)

The loading dock area was constantly slippery from

garbage and other food waste that was leaking from

the dumpsters on the loading dock.

In order to remove the slip hazard, the workers

routinely used a degreaser to wash the loading dock

area. The trench drain located at the loading dock

was connected to the stormdrain system so all the

degreaser and grease ended up in the creek.

To remedy this discharge a sump pump

was installed in the trench drain that ran to

the sanitary sewer instead of the

stormwater system.

Cross Connections (continued)

If you suspect you have found a cross connection into the stormwater system

call EHS at 962-5507. EHS will access building plans to try and determine if

a cross connection exists. EHS can also perform biodegradable dye tests to

determine where pipes discharge.

Dye in the water confirming that a

laundry facility was discharging into the

storm drain instead of the sanitary

sewer. This connection was fixed and

the laundry facility was connected to the

sanitary sewer.

Cross Connections (continued)

Good HousekeepingImproper storage of materials outdoors and not cleaning up spills of hazardous materials

are both common sources of stormwater pollution.

This bucket was found with oil on

top of the lid. If not corrected the

oil would wash into the nearest

storm drain the next time it rained.

If you have see a situation like this

or have a spill call EHS at 962-

5507.

This situation was addressed immediately by contractor

responsible for the bucket. (3/4/08)

Good Housekeeping- Chemical Storage

Chemicals and hazardous materials must also be stored and disposed of

correctly.

•This picture is an example of BAD

housekeeping practices

•Chemicals that are being stored

outside should be covered and be

placed in secondary containment

•If you need to dispose of

chemicals call EHS at 962-5507

•EHS will dispose of your

chemicals for FREE

Issues were addressed immediately by contractor. (8/19/2005)

Good Housekeeping- Chemical Storage

•This picture is an example of

GOOD housekeeping practices

•Barrels are labeled and in

secondary containment

•There is a cover to protect the

barrels from rain when not in use

Good Housekeeping- Spill Cleanup and Reporting

•Spills that are not cleaned up

immediately are a source of water

pollution

•EHS has a spill response team that

can assist in the cleanup of hazardous

materials spills

•If you have a spill or see a spill call

EHS at 962-5507 immediately

Spill cleaned up by EHS. (5/29/2008)

Good Housekeeping- Vehicle/Equipment Washing

•Do not wash your vehicles or

equipment and allow the wash water

to enter the storm drain

•UNC has a vehicle washing station

located at the service station

•Water is directed to the sanitary

sewer system

•Contact EHS for other alternatives if

you have equipment or vehicles that

need to be washed on a routine basis

Good Housekeeping-Pressure Washing

•Do not power wash areas that do not

need to be power washed

•Broom and shovel should be used to

clean up dirt

•If you need to use a power washer, the

wash water cannot enter the storm drain

•Contact EHS or visit our website at

http://ehs.unc.edu/environmental/stormw

ater/mobile to learn more about

disposing of water from power washing

operations

It is important to follow manufacturers

instructions when applying pesticides,

herbicides, and fertilizer. Never apply

pesticides immediately before rain is

forecast, and be careful not to over fertilize.

Rain can wash the pesticides, herbicides,

and excess fertilizer into the storm drain

system.

Good Housekeeping- Chemical Application

Construction Sites

Construction sites are another common source of stormwater pollution.

There are numerous chemicals and pollutants present on construction

sites that if not handled correctly can have negative impacts on water

quality. The most common pollutant at construction sites is sediment.

During clearing and grading operations vegetation and ground cover are

generally removed, and unless proper actions are taken to protect the soil

it will wash off the site during rain storms. Sediment is considered by the

EPA and State of North Carolina to be the #1 threat to water quality.

Sediment is bad for several reasons.

•Sediment is harmful to aquatic organisms

•Sediment fills in reservoirs

•Sediment makes water treatment more expensive

•Sediment is a mechanism to transport other pollutants such as heavy

metals and nutrients

Construction Sites (continued)

•On campus, the larger construction sites have Erosion and

Sedimentation Control Permits. These permits require that measures

are taken to prevent contaminated runoff.

•Smaller construction sites are not required to obtain permits but are

still required to take measures to prevent contaminated runoff.

•The following slides contain examples where measures were not

taken to prevent stormwater pollution. If you see an area on campus

like any of these pictures call EHS.

•Silt fence was not maintained

properly

•Soil and construction debris filling the

drainage channel

•Erosion and sedimentation control

measures must be maintained

throughout the duration of a project.

Construction Sites (continued)

silt fence

Silt fence was repaired, and slope above the fence was seeded to prevent erosion. (1/30/2008)

Construction Sites (continued)

•Stockpiles of soil need to be covered

and/or surrounded by silt fence

•If there is no cover on the stockpile, soil

will wash into the storm drain system

whenever it rains

Contractor covered pile until it was removed. (10/29/08)

•Muddy water should not run off from a site

•Proper controls were not installed to prevent

this from happening

Construction Sites (continued)

The following day, EHS visited the site and contractor repaired all

ESC deficiencies. (11/15/07)

Construction Sites (continued)

Smaller projects are required to install

erosion and sedimentation control

measures. On this site either silt fence

should have been installed on the down

slope areas or temporary cover should be

placed on the area when not being actively

worked or when rain is forecast. For small

areas like this, plastic tarps work well to

prevent erosion.

Department responsible for this area installed permanent cover to

prevent erosion upon notification by EHS. (1/30/2008)

Conclusion• Stormwater pollution is a serious problem that harms wildlife and

water quality, has adverse effects on recreation (swimming, boating,

and fishing), makes it more expensive to treat drinking water, and

causes economic hardship for commercial fisheries

• Illegal disposal of materials, cross connections, improper storage of

materials, improper cleanup of hazardous material spills, and

sediment from construction sites are all sources of stormwater

pollution

• If you notice any sources of stormwater pollution on campus, need

help cleaning up a spill, or need more information on how to prevent

stormwater pollution in day to day activities, contact EHS at 962-

5507

• Visit our website at www.ehs.unc.edu/environmental/stormwater for

more information on UNC’s stormwater program, and to find out

other ways you can help keep our water clean