21_IDDE Investigation SOP

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IDDE Investigation Form

Use this form when a potential IDDE has been reported and/or identified. This form outlines the procedures necessary to
identify the hazard potential of the IDDE while in the field.
Required PPE: Chemical resistant gloves, safety glasses, waterproof footwear, and reflective safety vest.
IDDE Work Order #: _____________________________________ (Number is generated from MS4 Permit Database)
Outfall #:________________________________________________ (Designated in GIS)
1. Site Data
Watershed (Circle one) : [Service] [Staley] [Little Alamance] [Gunn] [Back] [Dry] [Haw River] [Big Alamance]
Nearest Intersection or Street Address:
Date: Time:
Air Temperature: Inspector(s):
Weather (Circle One): [Sunny] [Cloudy] [Rain] [Previous Rain] [Snow] [Drought]
Previous 48 Hours Precipitation: Photos Taken? YES / NO
Land Use in Drainage Area (Check all that apply): Open Space__________________________________
Industrial____________________________ Institutional__________________________________
Residential__________________________ Other: ______________________________________
Commercial__________________________

2. Site Description (circle all that apply)
LOCATION MATERIAL SHAPE DIMENSIONS (IN.) SUBMERGED
Storm Sewer (Closed Pipe)
RCP CMP
Circular
Oval
Box
Other: _______
Single
Double
Triple
Other:________

Height:_______in.

Width:_______in.
In Water:
No
Partially_______%
Fully
With Sediment:
No
Partially_______%
Fully

PVC HDPE

Steel

Clay

Other: _________
Open drainage
(swale/ditch)
Concrete
Earthen
Rip-Rap
Other:_________

Depth:_________in.
Top
Width:________in.
Bottom
Width:________in.

Surface water
(Creek/Stream)
Type Depth:_________in.
Top
Width:_________in.
Bottom
Width:_________in.

Intermittent (can dry up during drought periods)

Perennial (flows constantly year round)

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IDDE Investigation Form
3. Site Investigation Visual Findings
INDICATOR CHECK if
Present DESCRIPTION RELATIVE SEVERITY INDEX (1-3)
Flow See Severity 1-Normal 2-Moderate 3-Substantial
Odor
Sewage
Sulfide
Laundry
Rancid/sour
Petroleum/gas
Other:
1–Faint 2 – Moderate 3 – Overwhelming
Color
Clear
Gray
Green
Multi-Color
Brown
Yellow
Orange/Red
Other:
1–Faint 2 – Moderately
visible 3 – Clearly Visible
Turbidity See severity 1–Slight
cloudiness 2 – Cloudy 3 – Opaque
Floatables
-Does Not
Include Trash!!

Sewage Suds and Foam
1–Few/slight;
origin not obvious
2 – Some;
indications
of origin
3 - Some;
origin clear
Oil sheen
Grease Other:

Briefly explain all findings:

4. Physiochemical Findings (use handheld probes)
Area of Concern Normal Range
Device: Hach, YSI
Temperature: Within 2.8 C of ambient ☐ Ok ☐ Not within acceptable range
pH: 7.0-8.6 (6-9 Standard) ☐ Ok ☐ Not within acceptable range
DO: >5 mg/L ☐ Ok ☐ Not within acceptable range
Conductivity <300 µs/cm ☐ Ok ☐ Not within acceptable range
Turbidity <25 NTU (50 Standard) ☐ Ok ☐ Not within acceptable range
Ammonia <0.1mg/L ☐ Ok ☐ Not within acceptable range
Nitrogen <.23mg/L ☐ Ok ☐ Not within acceptable range
Phosphorous <.1 mg/L ☐ Ok ☐ Not within acceptable range
Fecal Coliform <200FC/100mL ☐ Ok ☐ Not within acceptable range
Comments:

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IDDE Investigation Form
Based upon the findings the discharge appears to be: (check one and continue accordingly)
☐ Hazardous (Continue to #5-Emergency Contacts)
☐ Non-Hazardous (Skip to #6-Source Investigation)
☐ Not an Illicit Discharge (Skip to #8-IDDE Close-Out)
☐ No Discharge (Skip to #10-Close-Out Signature)

5. Emergency Contacts
Alamance County NC
Fire Marshall/Emergency Management Director
David Leonard
[phone]
City of Burlington NC
Office of Emergency Management
Roger Manuel
[phone]
City of Burlington Water Resources
Field Operations Manager
Michael Layne PE
[phone] Ext. 14
City of Burlington Stormwater Division
Environmental Specialist
Danny Scales/Chester Patterson
[phone] Ext. 12 & 13

6. Source Investigation
Source Identified? YES / NO Identified Source Owner Contacted? YES / NO
Name and Address of Identified Source Owner:

7. Physiochemical Source Findings (use handheld probes)
Area of Concern Normal Range Ambient (take ambient readings 20ft. upstream of source)
Device: Hach, YSI
Temperature: Within 2.8 C of ambient ☐ Ok ☐ Not within acceptable range
pH: 7.0-8.6 (6-9 Standard) ☐ Ok ☐ Not within acceptable range
DO: >5 mg/L ☐ Ok ☐ Not within acceptable range
Conductivity <300 µs/cm ☐ Ok ☐ Not within acceptable range
Turbidity <25 NTU (50 Standard) ☐ Ok ☐ Not within acceptable range
Ammonia <0.1mg/L ☐ Ok ☐ Not within acceptable range
Nitrogen <.23mg/L ☐ Ok ☐ Not within acceptable range
Phosphorous <.1 mg/L ☐ Ok ☐ Not within acceptable range
Fecal Coliform <200FC/100mL ☐ Ok ☐ Not within acceptable range
Comments:

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IDDE Investigation Form
8. IDDE Close-Out
Source Identified? YES / NO Date: Time:
Was Source Discharge Allowable Per Ordinance? YES / NO
(if YES, check one of the following)
Water line flushing
Landscape irrigation
Diverted stream flows
Rising ground waters
Uncontaminated ground water infiltration
Uncontaminated pumped ground water
Discharges from potable water sources
Foundation drains
Air conditioning condensation
Irrigation water

Springs
Water from crawl space pumps
Footing drains
(Lawn watering
(Individual residential car washing
(Flows from riparian habitats and wetlands
Dechlorinated swimming pool discharges
Street wash water
Flows from emergency firefighting
Other non-stormwater discharge
___________________________________________
(if NO, complete the following)
If NO, Explain:
All appropriate agencies contacted. YES / NO
The Illicit Discharge has been stopped/eliminated. YES / NO
Notification Given to Owner. YES / NO
All corrective actions have been completed. YES / NO
Follow-up visits required. YES / NO
Close-out of an Illicit Discharge will require a final physiochemical sample to verify the discharge has been eliminated.
Compare the sample to an upstream ambient sample.
9. Close-Out Physiochemical Source Findings (use handheld probes)
Area of Concern Normal Range Ambient (take ambient readings 20ft. upstream of source)
Device: Hach, YSI
Temperature: Within 2.8 C of ambient ☐ Ok ☐ Not within acceptable range
pH: 7.0-8.6 (6-9 Standard) ☐ Ok ☐ Not within acceptable range
DO: >5 mg/L ☐ Ok ☐ Not within acceptable range
Conductivity <300 µs/cm ☐ Ok ☐ Not within acceptable range
Turbidity <25 NTU (50 Standard) ☐ Ok ☐ Not within acceptable range
Ammonia <0.1mg/L ☐ Ok ☐ Not within acceptable range
Nitrogen <.23mg/L ☐ Ok ☐ Not within acceptable range
Phosphorous <.1 mg/L ☐ Ok ☐ Not within acceptable range
Fecal Coliform <200FC/100mL ☐ Ok ☐ Not within acceptable range
10. Close-Out Signature

Inspector Signature:
Date: Time:
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IDDE Investigation Form
11. Other finds or comments:

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IDDE Investigation Form
Reference Sheet:
Odor – Most strong odors, especially gasoline, oils, and solvents are likely associated with high responses on the
toxicity screening test.
 Stale sanitary wastewater: sewage
 Detergent, perfume: Laundromat or household laundry
 Sulfur (“rotten eggs”): industries that discharge sulfide compounds (meat packers, dairies)
 Oil and gas: facilities associated with petroleum products (gas stations, auto repair)
 Rancid-sour: food preparation facilities (restaurants, hotels)
Color – Important indicator of inappropriate industrial sources. Dark colors, such as brown, gray, or black are
the most common.
 Yellow: chemical plants, textile, and tanning plants
 Brown: meat packers, printing plants, metal works, stone and concrete, fertilizers, and petroleum refining
facilities [note: can be from natural organic acids if a wetland is upstream]
 Green: chemical plants, textile facilities
 Red: meat packers [note: can be from organic acids if a wetland is upstream]
 Gray: dairies
Turbidity – The cloudy appearance of water caused by the presence of suspended or colloidal matter. In dry
weather, high turbidity is often a characteristic of undiluted industrial discharges.
 Cloudy: sanitary wastewater, concrete or stone operations, fertilizer facilities, automotive dealers
 Opaque: food processors, lumber mills, metal operations, pigment plants
Floatable matter – Contaminated flow may contain floating solids or liquids directly related to industrial or
sanitary wastewater pollution.
 Oil sheen: petroleum refiners or storage facilities and vehicle service facilities. [note: there is a type of
bacteria that looks like an oil sheen. If you take a stick and swirl around the sheen, it will break up into
blocky pieces if it is the bacteria. True oil sheen will quickly re-form and not look blocky.]
 Toilet paper bits, fecal bits, food particles: sanitary wastewater
 Soap suds: if white or a clear sheen, laundry discharge (check odor) [note: can also occur from natural
surfactants; usually off-white or tan with an earthy-fishy odor.]
Deposits and Stains – Any type of coating near the outfall, usually a dark color. Deposits and stains will often
contain fragments of floatable substances.
 Lots of sediment: construction site erosion, sand and gravel pits, winter road applications
 Oil stain: petroleum storage, vehicle service facilities, petroleum refineries
 Rusty: precipitates from iron-rich water (natural or industrial) [note: if slimey and clumpy, it could be iron
bacteria]
 Grayish-black deposits and hair: leather tanneries
 White crystalline powder: nitrogenous fertilizer waste
Vegetation – Vegetation surrounding an outfall may show the effects of industrial pollutants.
 Excessive growth: food product facilities, fertilizer runoff (lawns, golf courses, and farms)
 Inhibited growth: high Storm Water flows, beverage facilities, printing plants, metal product facilities, drug
manufacturing, petroleum facilities, vehicle service facilities, and automobile dealers
Damage to Outfall Structures – Outfall damage can be caused by severely contaminated discharges that are
very acidic or basic in nature.
 Concrete or spalling (breaking off into chips or layers): industrial flows
 Peeling paint: industrial flows
 Metal corrosion: industrial flows