6_NCS000442_IDDE Program_20210708

3. Illegal Discharges
3-A. Requirements in the Rule
The Tar -Pamlico StorRrlWater Rule recluses that all municipalities establish a prograin to
preaent. ideratif} and remove illegal discharges. Illegal discharges arc 110%%5 in the stormwater
l'i)llectton system that are not ass(,clatc(l u iih st()rnnvater runol f or an allowable discharge.
3-B. What is an Illegal Discharge?
Storniwater collection systems are VUlncrable to recek-ing, illegil discharges (even though the
person responsible for the discharge may be timw.arc that it is l)ependint; on their
sc)urce. ills al dlschtaroes nia% ccn.ve% pollutants such ,Is nutricnt,;. phenok. and metals to
receiving %, atcrs. fable a €dentiIies sonic potentiial flows to the ,Iortilwfflcr collection system
that tray be allo%�ablc Fable ,b 'identifies some discharge's, that are not allok%ed.
Tahte 3a- Discharnes that may be allowable to the stormwater collection system
Waterline Flushing
Landscape Irrigation Diverted Stream Flows
Uncontaminated R sing
Uncontaminated Gro-ind ;
Uncontaminated Pumped
Ground Water
Water Infiltration to sto-alwater
Ground Water
col ection system
Discharges from potable
Foundation Drains
Uncontaiflinated Air
water sources
Conditioning Condensation
Irrigation Water
Springs
( Water from Crawl Space
j
Pur'ps
Footing Drains
Lawn Watering
Wm -commercial Car Washing
Flows from Riparian I-lab-tats NPDES permitted d scharges
Street wash water
and Wetlands
Fire Fighting Emergency
Wash `!!,later from the
Dechlor€nated backwash and
Activities
Cleaning of Buildings
dra ning associated .vith
sw€-nming pools
Table 3b: Tvpes of Discharqes that are not allowed to stormwater collection system
Dumping ofor. ant; -freeze Commercial Car Was;n i
Indsstrsal Discharges
paint, clean ng f uids
Contaminated Foundation
Cooling water un ess no
Washwaters from commercial
Drains
chemicals added and has
? industrial activities
NPDES Permit
Sanitary Seaver Discharges
Septic TanR Discharges
�tNlaswrig Machine Discharges
Chlorinated backwash and
draining associated w.th
swimming pools
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3-C. Establishing Legal Authority
One. of the; first steps that each. local government is required to take is establishing the legal
authority to control illegal disctlar+ges. According to the policies of each individual local
goVerrimerlt, this legal authorit% tnav be carried out through ordinances, policies. city cedes or
charters.
€ v .August 2004. the City is recuired to slao« that it has established the Icgaf authority to do
the lollowing:
• Control the contribution of ille2al pollwants identified in 1 able 31) to ale stonw,%,atcr
Collection Syst: nl,
• Prohibit illcgarl discllar-es to the storniwntcr collection system.
• Prohibit diSChar,e Ul Spills and disposal oC niatcriails other than storna4yater to the
stormwater collection st'Stenl.
Determine: compliance and non-conaplianct
• Rcquire compliance and Miderake entorcetjlent measures in cases of non-compliance.
A copy of the ordinance: which establishes this authority for the City ol' Rocky ti1ourlt is
provided in :lppendiy P. This ordinance will be applied within the city's corporate limits as
ddined in the ordinance and enlc+rced through the provisions defitied in the OYdinanee.
3-D. Collecting Jurisdiction -Wide Information
4 The City- will collect gco+graphic infortnaton at three increasing levels of'detail:
_ The firs. most ctirsor�- level is inlonnation that shall be collected for the°entire
jurisdiction The associated requirements are disctrssed in this section.
• the second level -will be a more: detailed screcning for high priority areas Within the
jurisdiction 1 he associated rccluirernents are disCtr,aed in Section
The third level will be a detailed investioation to be conlpicted upon the discovery of an
illegal discharge. The associated requirctiwnts are discussed in Section
y. ']'he purpose of Collecting jurisdiction -vide intorination. are to assist with identifying potential
illegal disthal'-e scltures a0d characterizing ille,,a, discharges after they are discovered.
- The City Will l'lilfill this rccluirenlent by compiling reaps and GIS coverages that show the
f�llo«'in�� infol•nlatiOn. Pursuant to the reeluiretltrnts of the model plan, the neaps shall be at a
scale no ercatcr than 1:24.000,
• l.ocation of sanitary sewers in areas of the na.tjor Stornl«•ater Collection systems and the
location of areas that are not serwd by sanitary sewers.
• W-afters that appear on the l °SDA - Natural RCSOttrce Conservation Service Soil Survey
.Mtaps truce the U.S. CicolOUical Survey 1:2-1.000 scale topographic slaps.

• Land uses. Categories. at a nlinitnum, shOuld include undeveloj)cd. residential,
camrnercial, a(Iricultttre, industrial. institutional. publicly oohed open space and others. R-
Currenil\. operating and known. closed municipal landfills and other treatment. storage_
and di4posal facilities. includin'- for hazzirdous materials.
• Major stormwmer structural controls.
Krno%4n NPDES permitted discharges to the storinwater collection sNstem (this list can be
obtained from the Division of Water Qualit.).
%'rJ n descriptions will be provided for the map components as follows:
A surnmary table of municipal \\'TsLe lacilitit:s that includes the names of the facilities. the
status (openlclosed). the t� pes, ,Ind addrLsseS.
A summary table ol'the NI'Df;S pertnitteil cliscllargcr5 that includes the name ofthe permit
holder, the address of the facility and permit number. —
• A surt)mary tableof' the nia'Ur structural storinwater control structures that shoes the tti•pc
of titructure. area served, panly.responsible for € aintaininwr. and age of' structure to the
extent it Lan be determined.
• A suntmar\, table; of liuhlicly° owned open space that identifies size, location, and primary
function of each open area.
The City "Ol colnpletc this calteCtion ofjurisdiction-wide information b� the time the second
annual report is clue (October 2006).
3-E. Mapping and Field Screening in High Priority Areas
Reoinnine in the third year After lull lementation of' the local stornmater program (2007), the
Cio, will identify a llt;3h priority area (11' its jurisdiction fclr more detailed mapping and field
screeslim_,. I'his hi!uh pr_ority area shall comprise at least ten I)erccnt of the jurisdictional area.
l';lcll subscciuent year. the City will screens-nt, another high priority area that comprhes at least
ten percent of its jurisdiction_
-ThL,h priority" means the arcLls within ajurisdiction inhere it is most like.l•- to locate ille5zat
dischar,cs. Based ors the cNperiences of Ralcigh and Durham. the most likely locations for
identil-)in-, illc,Tal dischar;;es are areas with older development. Each annual report Will
include the basis for selection of the high priortty tu'eas screened.
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I'lae first part of the screemmg process for the selected hiUh priority area will be to map tke
,t€€rmwater system. AI a mini'llum, the map that i,; produced «-ill include the f0110«ing'
• Locations of'tfle Outfalls, or the points of'discharge. of any pipes front non -industrial areas
that are s.;r£ater than or equal to 36 inches,
Locations of the outfalls of and pipes trona industrial areas that are greater than or ccl°aaIto
12 inches.
• Locations of the outfalls of drainaie ditches that drain more than 50 acres of lion-
.. industrial lands.
• Locations ofthe outfalls of'drainage ditches that drain more than 2 €:crew O'MJIL€stri�ll land
• An accompanying suninixy table listing the outfalls that Meet the aboke criteria that
includes uutf.all 1I loCatl€ n, primary and supplemental clatisif€Cation elf'
-- receivinu ti� ater, 'salld U,SC-s,ipport ill receiving L%awr.
The second part of the screeningg process ti)r the selected high priority area is conductinc, a dry
-- \%eather f►cld screenim-, ofall ol.l falls that meet the above criteria to detect illegal discharges.
The dry weather field screening shall not be conducted da€ring or N\ithiit 72 llaurs folloNking a
rxll event o[ {),l inches or Lreiter, In resadenfal area,. it :s recommended to conduct the field
^` screeninc, either before 9:00 am or -&.-r 5:00 pm. since these are the 11Ours that c:tizesls are
mast likely to be home and thus anv discharges are mare likely to be evident.
figure 3a illutitrates the process to be fOIIO\'E'cl for conducting field screening sampling
ac€ivitiea and following up �kilh anv findings ot'dry weather flow. As shown to the figure, if
the field screening showvs that an outfiarl is dry, then the out}all should be checked for
lnterm€ ant f7ou at a later date.
Ifthe field screening shoN4s that an outfall has a dry weather 11Ow, then the City wit: cOmplete
a screening report tier the olnfiall, The anfornl,atlon thcit should be contained in the screening,
report is Outlined irl -bible 3c. Screening reports shall be kept on file for a inininluna 01 live
years. ExampIc screening report fortes are provided in Appendix Q.
2-

Table 3e: Field Screening Report Information
General Information
Sheet Number
Outfal! ID Number
Date
Time
Date, Time and Quantity
of Last Rainfall Event
Field Site Description
Location
Type of Outfall
Dominant Watershed Land Use(s)
Visual Observations
Photograph
Deposits/Stains
Odor
Vegetation Condition
Color
Structura; Condition
Clarity
Biological
Floatab'es
Flow Estimation
Sampling Analysis "
Temperature
Nitrogen-Nitrate/Nitrite
pH
Fluoride or Chlorine
Nitrogen -Ammonia
Total Phosphorus
Ortho Phosphate
* Analytical monitoring is required only if an obvious source of the dry weather flow cannot
be determined through an investigation of the upstream stormwater collection system.
Outfalls with flow will be screened again within 24 hours for the above parameters. The tests
for ammonia and nitrate/nitrate that are purchased should be sensitive for 0.1 to 10 mg/L.
Mh
28 -1114

Figure 3a: Field Screening Process
No flow
Screen outfall in high priority area Check for signs of intermittent flow
IF
Flow found Flow No flow
found
IF
Inspect and sample flow Outfall OK
Investigate source of flow, considering
he following:
• Jurisdiction wide information collected
• Field investigation of drainage area of
outfall
• Sampling data
• Qualitative observations -- sheen, odor,
turbidity, etc.
Remove illegal discharge
Checking for intermittent flow includes rechecking outfall at a later date as well as visual
observations for evidence of intermittent flow.
Note: Analytical monitoring is required only if an obvious source of the dry weather flow
cannot be determined through an investigation of the upstream stormwater collection system.
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The purpose of the field screening is to provide clues as to the source of the illegal discharge.
The characterization should be used in conjunction with the jurisdiction -wide information and
a field investigation to identify the source of the illegal discharge. The process of identifying
and removing illegal discharges is discussed in the next section.
3-F. Identifying and Removing Illegal Discharges
After the field screening is complete, the City will take measures to identify and remove any .-.
illegal discharges identified. Identifying illegal discharges may require a combination of
office and field work. After the field screening, City staff will consult the jurisdiction -wide
information compiled (see Section 3-D) to obtain information about the land uses,
infrastructure, industries, potential sources and types of pollution that exist in the drainage
area of the outfall.
After potential sources have been identified, a systematic field investigation will be planned
that minimizes the amount of resources required to identify the source. Methods that my be
used to identify the source of the discharge include, but are not limited to:
• Site Investigation
• Additional Chemical Analysis (recommend testing for fecal coliform if the ammonia
concentration was found to exceed 1.0 mg/L)
• Flow Monitoring (recommended to use multiple site visits rather than a depth indicator)
• Dye Testing (fluorescent dye is recommended)
Smoke Testing
• Television Inspection
Documentation of the field investigations results will be kept on file for a minimum of five
years with the screening report.
Upon identification of the source of an illegal discharge, the City will use the legal authority
established in its ordinances to have the source removed and/or deal with non-compliance.
In addition to keeping all screening reports on file, the City will maintain a map that includes
the following:
Points of identified illegal discharges.
Watershed boundaries of the outfalls where illegal discharges have been identified.
• An accompanying table that summarizes the illegal discharges that have been identified
that includes location, a description of pollutant(s) identified, and removal status.

3-G. Preventing Discharges and Establishing a Hotline
The City of Rocky Mount has established a Stormwater Hotline [phone]) that is
publicized through the City web page, the news media, bill inserts and other media. The
hotline is publicized as a means for citizens and stormwater customers to report flooding,
clogged pipes and other drainage problems as well as illegal dumping, spills and illicit
discharges. After hours calls for emergencies such as toxic spills will be referred to the Police
Department for relay of dispatch to the proper department.
In addition to the Stomwater Hotline, the City will implement a public education program to
inform businesses and residents about what types of discharges should not go to the
stormwater collection system. The education program will be tailored to be appropriate to the
intended audience and will include contacts to likely sources of illegal discharges. Some of
these sources include automotive sales, rental, repair and detailing establishments, lawn care
companies, cleaners and certain types of contractors.
3-H. Imp cementation Schedule
Implementation Schedule and Annual Reporting Requirements
Year
Implementation Requirements
Annual Report Requirements
By August 2004
Establish legal authority to address
• Submit report identifying
illegal discharges
established legal authority to meet
requirements.
By October 2006
Collect jurisdiction -wide
• Report on completion of
information.
jurisdiction -wide information
• Select high priority area for
collection.
addit-onal screening.
• Submit map of high priority areas
• Initiate illega: discharge hotline.
and reason for selection.
• Report on initiation of illegal
discharge hotline.
Each subsequent
• Complete mapping and field
• Submit map of stormwater
year after 2006
screening for high priority area.
collection system in high priority
• Select next high priority area.
area upon request by DWQ.
• identify and remove I legal
• Document illegal discharges
discharges as encountered.
found and resulting action.
• Contonue operating illegal
• Report on hotline usage and
discharge hotline.
actions taken.
• Submit map of next high priority
area and reason for selection.
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3-L References
Debo, Thomas N. alift Pecse. J.. Municipal Stornmater Managmient, CIZC Press,
InC. 1995
U.S. F"iivirotimental Protection geiicy (E,E'r1). 1992. \-i,tnr:,il of PraCtiCC - Izlei1til€Cstion of -
Illicit Comiectiow, 1;PA 83 -R-9(;-1()O
IJ.S. E-aviroiinicittal Protection f0g-ei-icy (E-:1'A). 1993. ol'lnapprophatc Pollutant
Entries into Storm Drainage Systems - A 11SCr'S Gr€idc. 1 PI--� 600 R-9? 3S.
U.S- Fn%iromnemal Pro(cclion Ag ncy (LP.\). 1991, Guidance Manual Ior the Preparation of
Part 1 ofthe NPDIS Permit Applications Itu Discharues from \Itmicipal Separate Storm
Sewer S\stems. EPA 50-;'5-91-00').\