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FORM 2c – INSTRUCTIONS (continued)

Item V-A, B, C, and D (continued)

knowledge

your

raw

materials,

maintenance

chemicals,

times, the collection of duplicate samples, etc. The time when you

intermediate and final products and byproducts, and any previous

sample should be representative of your normal operation, to the

analyses known to you of your effluent or similar effluent. (For

extent feasible, with all processes which contribute wastewater in

normal operation, and with your treatment system operating properly

example, if you manufacture pesticides, you should expect those

pesticides to be present in contaminated stormwater runoff.) If you

with no system upsets. Samples should be collected from the center

would expect a pollutant to be present solely as a result of its

of the flow channel, where turbulence is at a maximum, at a site

presence in your intake water, you must mark “Believe Present” but

specified in your present permit, or at any site adequate for the

you are not required to analyze for that pollutant. Instead, mark an

collection of a representative sample.

‘X’ In the “Intake” column.

For pH, temperature, cyanide, total phenols, residual chlorine, oil and

grease, and fecal coliform, grab samples must be used. For all other

Reporting. All levels must be reported as concentration

and as total mass. You may report some or all of the

pollutants 24-hour composite samples must be used. However, a

required data by attaching separate sheets of paper

minimum of one grab sample may be taken for effluents from holding

instead of filling out pages V-I to V-9 if the separate sheets

ponds or other impoundments with a retention period of greater than

contain all the required information in a format which is

24 hours. For stormwater discharges a minimum of one to four grab

samples may be taken, depending on the duration of the discharge.

consistent with pages V-I to V-9 in spacing and in

identification of pollutants and columns. (For example, the

One grab must be taken in the first hour (or less) of discharge, with

data system used in your GC/MS analysis may be able to

one additional grab (up to a minimum of four) taken in each

print data in the proper format.) Use the following

succeeding hour of discharge for discharges lasting four or more

abbreviations in the columns headed "Units" (column 3,

hours. The Director may waive composite sampling for any outfall for

Part A, and column 4, Parts B and C).

which you demonstrate that use of an automatic sampler is infeasible

and that a minimum of four grab samples will be representative of

your discharge.

Mass

Concentration

Grab and composite samples are defined as follows:

ppm…….parts per million

lbs…………...…….pounds

mg/l ...milligrams per liter

ton….........tons (English tons)

Grab sample: An individual sample of at least 100 milliliters

ppb.…......parts per billion

mg………..............milligrams

collected at a randomly-selected time over a period not exceeding

ug/l ...micrograms per liter

g……………….............grams

15 minutes.

kg……………..…..kilograms

Composite sample: A combination of at least 8 sample aliquots

T………..tonnes (metric tons)

of at least 100 milliliters, collected at periodic intervals during the

All reporting of values for metals must be in terms of “total

operating hours of a facility over a 24 hour period. The composite

recoverable metal,” unless:

must be flow proportional; either the time interval between each

aliquot or the volume of each aliquot must be proportional to either

(1) An applicable, promulgated effluent limitation or standard

the stream flow at the time of sampling or the total stream flow

specifies the limitation for the metal in dissolved, valent, or total

since the collection of the previous aliquot. Aliquots may be

form; or

collected manually or automatically. For GC/MS Volatile Organic

(2) All approved analytical methods for the metal inherently

Analysis (VOA), aliquots must be combined in the laboratory

measure only its dissolved form (e.g., hexavalent chromium); or

immediately before analysis. Four (4) (rather than eight ) aliquots

or grab samples should be collected for VOA. These four samples

(3) The permitting authority has determined that in establishing

should be collected during actual hours of discharge over a 24-

case-by-case limitations it is necessary to express the

hour period and need not be flow proportioned. Only one analysis

limitations on the metal in dissolved, valent, or total form to

is required.

carry out the provisions of the CWA.

If you measure only one daily value, complete only the “Maximum

Data from samples taken in the past may be used, provided that:

Daily Values” columns and insert ‘1’ into the “Number of Analyses”

column (columns 2-a and 2-d, Part A, and column 3-a, 3-d, Parts B

All data requirements are met;

and C). The permitting authority may require you to conduct

Sampling was done no more than three years before submission;

additional analyses to further characterize your discharges. For

and

composite samples, the daily value is the total mass or average

concentration found in a composite sample taken over the operating

All data are representative of the present discharge.

hours of the facility during a 24-hour period; for grab samples, the

daily value is the arithmetic or flow-weighted total mass or average

Among

the

factors

which

would

cause

the

data

concentration found in a series of at least four grab samples taken

unrepresentative are significant changes in production level,

over the operating hours of the facility during a 24-hour period.

changes in raw materials, processes, or final products, and changes

in wastewater treatment. When the EPA promulgates new

If you measure more than one daily value for a pollutant and those

analytical methods in 40 CFR Part 136, EPA will provide information

values are representative of your wastestream, you must report

as to when you should use the new methods to generate data on

them. You must describe your method of testing and data analysis.

your discharges. Of course, the Director may request additional

You also must determine the average of all values within the last

information, including current quantitative data, if she or he

year and report the concentration and mass under the “Long Term

determines it to be necessary to assess your discharges.

Average Values” columns (column 2-c, Part A, and column 3-c, Parts

B and C), and the total number of daily values under the “Number of

C. Analysis: You must use test methods promulgated in 40 CFR

Analyses” columns (column 2-d, Part A, and columns 3-d, Parts B

Part 136; however, if none has been promulgated for a particular

and C). Also, determine the average of all daily values taken during

pollutant, you may use any suitable method for measuring the level

each calendar month, and report the highest average under the

of the pollutant in your discharge provided that you submit a

“Maximum 30-day Values” columns (column 2-c, Part A, and column

description of the method or a reference to a published method. Your

3-b, Parts B and C).

description should include the sample holding time, preservation

techniques, and the quality control measures which you used. If you

B. Sampling: The collection of the samples for the reported

have two or more substantially identical outfalls, you may request

analyses should be supervised by a person experienced in

permission from your permitting authority to sample and analyse only

performing sampling of industrial wastewater. You may contact your

one outfall and submit the results of the analysis for other

DEQ authority for detailed guidance on sampling

substantially identical outfalls. If your request is granted by the

techniques and for answers to specific questions. Any specific

requirements contained in the applicable analytical methods should

be followed for sample containers, sample preservation, holding

2C-1

Form 2c - Application For Permit To Discharge Wastewater - Existing Manufacturing, Commrecial, Mining And Silviculture Operarions - Idaho Department Of Environmental Quality Page 2

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