MS4 Outfall & BMP Mapping Using GIS

Mark E Stivers, AICP
Director of Planning and Development
East Hempfield Township

Mark E Stivers, AICP
Director of Planning and Development
East Hempfield Township

MCM#3 - ILLICIT DISCHARGE
DETECTION AND ELIMINATION
(IDD&E) — MINIMUM CONTROL
MEASURE

MCM#3 BMP: Map all outfalls
and receiving water-bodies

Where to Begin…

Data Collection – Key Terms
• Outfall -A point source as defined by 40 CFR 122.2 at the point
where a municipal separate storm sewer discharges to waters of
the United States and does not include open conveyances
connecting two municipal separate storm sewers, or pipes,
tunnels or other conveyances which connect segments of the
same stream or other waters of the United States and are used to
convey waters of the United States.
• Point Source - any discernable, confined and discrete
conveyance, including but not limited to any pipe, ditch,
channel, tunnel, conduit, well, discrete fissure, container, rolling
stock, concentrated animal feeding operation, vessel, or other
floating craft from which pollutants are or may be discharged.

Data Collection – Key Terms
• Pollutant - dredged spoil, solid waste, incinerator residue, filter
backwash, sewage, garbage, sewage sludge, munitions, chemical
wastes, biological materials, radioactive materials (except those
regulated under the Atomic Energy Act of 1954, as amended (42
U.S.C. 2011 et seq.)), heat, wrecked or discarded equipment, rock,
sand, cellar dirt and industrial, municipal, and agricultural waste
discharged into water.

Data Collection

Data Collection
• Identify major and minor drainage basins.
• Identify major waterways within the drainage basins
(Receiving Bodies of Water)
• Develop a plan to systematically walk each stream and
identify each outfall.

Data Collection – Drainage Basins

Data Collection – Receiving Water
Bodies

Data Collection – Collecting Outfall
Data

Data Collection – Collecting Outfall
Data
• We utilized our Township Engineer, RAV Associates to
collect the data for the outfalls.
• They collected location and site condition data on 353
outfalls.
• They then created data points for each outfall.
• They numbered each outfall.
• They filled out a field sheet for each outfall.

Data Collection – Collecting Outfall
Data
ILLICIT DISCHARGE FIELD SCREENING PROGRAM
Data Collection Form
OUTFALL #: Date: Time:
TIME SINCE LAST RAIN: 72 hours 72 hours
QUANTITY OF LAST RAIN: 0.1 inches 0.1 inches
INSPECTION TEAM:
SITE DESCRIPTION:
LOCATION (Narrative Description):
STRUCTURE TYPE: OPEN CHANNEL MANHOLE OUTFALL OTHER:
DOMINANT WATERSHED LAND USES: INDUSTRIAL COMMERCIAL RESIDENTIAL UNKNOWN
OTHER:
FLOW ESTIMATION:
WAS FLOW OBSERVED? NO YES IF YES, PLEASE ANSWER a. - d. BELOW.
a. WIDTH OF WATER SURFACE (feet):
b. APPROXIMATE DEPTH OF WATER (feet):
c. APPROXIMATE FLOW VELOCITY (feet per second):
d. FLOW RATE (cubic feet per second) = a x b x c =
VISUAL OBSERVATIONS:
WAS A PHOTO TAKEN? NO YES (Roll and Photo Number: )
ODOR: NONE MUSTY SEWAGE ROTTEN EGGS SOUR MILK OTHER:
COLOR: CLEAR RED YELLOW BROWN GREEN GREY OTHER:
CLARITY: CLEAR CLOUDY OPAQUE
FLOATABLES: NONE OILY SHEEN GARBAGE/SEWAGE OTHER:
DEPOSITS/STAINS: NONE SEDIMENTS OILY OTHER:
VEGETATION CONDITION: NONE NORMAL EXCESSIVE GROWTH INHIBITED GROWTH
STRUCTURAL CONDITION: NORMAL CONCRETE CRACKING METAL CORROSION OTHER:
BIOLOGICAL: MOSQUITO LARVAE BACTERIA/ALGAE OTHER:
FIELD ANALYSIS:
WATER TEMP: F / C CHLORINE (Total): mg/l
pH: COPPER: mg/l
PHENOL: mg/l DETERGENTS: mg/l
WAS A LABORATORY SAMPLE COLLECTED? NO YES
(if yes attach copy of chain-of-custody record)
COMMENTS:
DATA SHEET FILLED OUT BY: (signature):
DATE:
(print name):

Data Collection – Outfall Map
• Next, we created a map showing all the outfalls. This
included data such as site number, type of structure,
and if it is a dry weather flow.
• A dry weather flow is an outfall that has water flowing
when there has been no rain for at least three days.

Data Collection – Outfall Map
• What Should My Map Look Like? Understanding the location of your
separate storm sewer system outfalls is the key to effectively managing
stormwater runoff and protecting water quality. Not all system maps will look
alike, but they should contain the same basic information and ultimately serve
as a tool for your employees responsible for implementing the IDD&E Program
(Illicit Discharge Detection & Elimination), as well as other components of the
Stormwater Management Program.
• SCALE. The map must be of a scale that shows street-level detail and extends
beyond the service boundaries of the municipal storm sewer system. A scale
between 1:10,000 and 1:25,000 may be appropriate for many small MS4s that
cover a large land area. This scale is acceptable as long as street-level detail can
be obtained. Otherwise you should use a map scale that best depicts specific
location information for each outfall, as technicians in the field will need
street-level detail in order to effectively locate and monitor outfalls.

Data Collection – Outfall Map
• SYSTEM FEATURES. The goal of the system mapping is to identify all outfalls
and the name/location of the receiving water bodies, to support an effort to
detect and eliminate illicit discharges.
• FORMAT. Only you can determine what format is best for your community.
Factors such as staff, money, format of available data and equipment will
dictate how you generate your system map. You may wish to use a geographic
information system (GIS) to electronically generate your system map. PA DEP
recognizes that not all communities have GIS capabilities. For those that do not
have GIS capabilities, you can generate your map using other means. The
format of your map is not as important as the quality of the information it
contains. For help with developing your system map, consult the list of
resources provided in Appendix 1.

Data Collection – Collecting Outfall
Data

Data Collection – Collecting Outfall
Data

Data Collection – Collecting BMP
Data
• Next Step in the process was
collecting the BMP data.
• We were able to hire a summer intern
from Millersville University to help
with the Data Collection.
• We began by pulling together a list of
all the Land Development Plans that
were recorded within the designated
time period.

Data Collection – Collecting BMP
Data
• We developed an Excel Table to track the data.
• Data included Parcel Number, Plan Number, Location of
File, and Plan Name
Parc_Numb Plan_Numb Stor_Loc Plan_Name
2909818000000 06-122-FP Box_62 CFC
2905976300000 04-49-FP Box_73 Hassel_Tract
2908077300000 03-30-FP SALDO Brub_BP
2900193100000 09-19-RFP Filing_Cab Nool_L_1
2902695300000 05-94-FLD SALDO
2906930300000 06-114-FP Filing_Cab SKH
2907311700000 03-44-FLD Box_25 Regen_Sq
2902016000000 05-59-FP Filing_Cab Hayden_Mnr
2901665200000 04-52-FLD SALDO Mear_Kia
2903034400000 03-45-FLD SALDO Lacn_Toy
2901227100000 09-03-FP Filing_Cab Gold_Mead_P
2908429800000 05-73-FLD Box_79 St_Edwards
2901389700000 03-24-FP SALDO Winde_Pl
2904352700000 05-95-FP Filing_Cab HSD
2903496400000 06-116-FP Filing_Cab Hemp_Cross
2901638700000 05-99-FLD Filing_Cab Union_Natl
2903863900000 04-63-FLD SALDO LASA
2905950100000 03-43-FLD Box_31 BJs
2909456600000 05-93-FLD Filing_Cab SHEETZ
2900972400000 06-83-FLD/07-151-FP Filing_Cab The_Arbors
2903762400000 06-120-FP/03-41-FP SALDO Vill_Grande
2908310100000 04-55-FP Box_74 Porter_Trt

Data Collection – Collecting BMP
Data
• Next the Intern made a copy of the recorded Land
Development Plan and Identified the BMPs .
Swale
Basin
End Wall

Data Collection – Collecting BMP
Data
Swale
Basin
End Wall

Data Collection – Collecting BMP
Data
• Next we merged the Excel Table with the GIS parcel
data to create a new GIS layer.
• We used the Account Number as the Key Field for the
merge (Join in GIS lingo).

Data Collection – Collecting BMP
Data

Data Collection – Collecting BMP
Data

Data Collection – Collecting BMP
Data

Data Collection – Collecting BMP
Data

Data Collection
Trimble® GeoXH® 2008

Data Collection – Collecting BMP
Data
• Next steps is taking samples of dry weather flows.
• To do this we use the GPS to locate the outfalls.
• Photos are taken at each location and attached to the
record.
• A file is kept for record keeping and any needed
follow-up.

Contact info :
markstivers@easthempfield.org
717.898.3100