Transcript Discharge Monitoring Reports (DMRs) Helpful Tips for completing DMRS What is a DMR? • Routine report submitted (usually monthly) by the permittee to the Department.

Discharge Monitoring Reports
(DMRs)
Helpful Tips for
completing DMRS
What is a DMR?
• Routine report submitted (usually monthly) by
the permittee to the Department which contains
analysis or results of calculations derived from
self-monitoring analytical data.
• Typically contains three parts
• Part A (Main Portion - Summary)
• Part B (Daily Results)
• Part D (Ground Water Data)
• May be more than one set of DMRs/facility
“Helpful Tips”: Background
• DEP developed a “Tips” document Aug.
2003, to assist owners/operators in avoiding
common mistakes when completing DMRs
for submittal
• Help ensure consistency
• Also, to assist internal staff that routinely
review these reports.
Important facts to remember
• ALL sample results obtained, even if there are
more analysis performed than required, must be
reported provided they are analyzed using the
proper method.
• “Tips” was developed to help clarify and assist.
• “Instructions for Completing the Wastewater
DMR” should have come with your original DMR.
• These “Instructions” should be followed foremost.
Helpful Tips: Topics Covered
• Daily Data defined
• Reporting and
calculating data for:
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Flow
Water Quality data
Loading data
Fecal Coliform
Toxicity
• Data for new facilities
• Reporting data from
continuous monitoring
– Strip Chart
– Computerized data
• Significant Figures
• BDL and other data
qualifiers
Daily Data
Rule 62-620.200(10), F.A.C., defines
“daily discharge” as: the discharge
measured during a calendar day for any
24-hour period that reasonably
represents the calendar day for purposes
of sampling.
Daily Data (cont’d)
• Typically, the calendar day of 12:00
midnight – 11:59 p.m. is used.
• However, a permittee may specify a 24-hour
period that corresponds to staffing shifts as
their reporting day, provided it is consistent
for purposes of reporting and should not
vary from one day to another.
Reporting Flow Data
• Daily Flow
– Daily Flow amounts, or daily totals,
should be entered on Part B of the DMR
in the units specified on the DMR
• If no discharge occurred, enter “0” for that
day’s flow amount.
Reporting Flow Data (cont’d)
• Monthly Average Flow
– This is normally reported on Part A.
– A monthly average for flow is calculated by
summing the daily flow amounts and then
dividing by the number of days in the month
(include days in which there was no discharge).
Reporting Flow Data (cont’d)
• Annual Average Flow
– Reported on Part A, expressed in units of MGD
– Rule definition is to total the last 365
consecutive days of flow and divide that total
by 365.
– For practical purposes it may be calculated as
the rolling arithmetic mean of the last 12
monthly averages.
Water Quality Data
• Unlike Flow, averages for water quality data
are based on a sum of the numerical results
divided by the number of observations.
(days of no discharge are not factored into
these calculations).
Water Quality Data (cont’d)
• Daily Data
– Reported on Part B.
– If your permit requires daily monitoring for a
parameter, an appropriate sample should be
taken on each day there is a discharge.
– Reporting Max and Min.
• No calculations required to report these values
• Review the daily data on Part B for the entire month
• Select highest value for Max, lowest value for Min
Water Quality Data (cont’d)
• Weekly Data
– If your permit requires a sample frequency of
weekly, then at least one sample on a day of
discharge during that week should be collected.
– It is recommended that a sample at the first
occurrence of a discharge be collected to
ensure that required sampling is met.
– Recommended Week: Sunday to Saturday
(consistency is important)
Water Quality Data (cont’d)
• What about Partial Weeks?
– For example, February 2004 ends on a Sunday.
– If following the recommended week (Sun-Sat);
• the daily results for Sun, Feb 29th should be entered
on Part B and used in the monthly calculations for
the month of February.
• when calculating weekly results the data collected
on this day should be included for the first week of
March, 2004.
Water Quality Data (cont’d)
• What if only one sample/month?
– Report that value as the Monthly Average and
Maximum (or Minimum, whichever applies).
– Similarly samples collected once/week would
be reported as the weekly average.
Water Quality Data (cont’d)
• Calculating Annual Average
– Calculated as the arithmetic mean of the 12
monthly averages collected during the last
consecutive 12 month period.
– If “no discharge” reported for one (or more) of
those 12 months, then base the average on the
number of months with a discharge.
Loading Data
• Calculated by combining concentration data
with flow data.
• Limits are primarily expressed in three ways:
– Monthly average, Daily average (based on number
of days of discharge) and Daily Maximum
• Expressed in terms of pounds per day (lbs/day).
• [lbs/day] = [8.34]*[flow in mgd]*[concentration in mg/L]
• Referred to “Tips” for examples
Reporting Fecal Coliform Data
• Daily Values (Max)
• Percent less than detection
• Monthly Averages
– geometric mean
– monthly median
• Annual Average
• which reporting requirement generally depends on
level of dis-infection and/or monitoring frequency.
Fecal Coliform: Daily Data
• Recorded on Part B
• Observations less than detection should be
reported as “<1” (if MF technique) or
“<2.2” (if MPN technique)
• On Part A record the Maximum as the
highest value recorded on Part B.
Fecal Coliform: %<detection
• Count the number of daily observations that
the value was below detection.
• Divide this by the total number of fecal
coliform observations for the month.
• Multiply by 100%
• Round to nearest whole integer.
Fecal Coliform: 90th percentile
• If permit limit is that no more than 10% of the
samples during a 30 day period shall exceed a
certain value, the 90th percentile will be
reported on the DMR.
• Example how to calculate:
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10 samples with fecal results 8,4,5,20,7,6, 34, 22, 4, 18
List values in ascending order: 4, 4, 5, 6, 7, 8, 18, 20, 22, 34
Multiply the number of samples taken by 0.9: 0.9*10 = 9
Report the 9th value in the series as the 90th percentile: 22
Fecal Coliform: Monthly Geo Mean
• Rule 62-600.200(33), F.A.C., defines it as
the nth root of the product of n numbers.
– In other words, in order to calculate the
geometric mean of n observations, each of the n
values would be multiplied together and the
resulting product will be raised to the 1/nth
power
• Refer to “Tips” for examples on how to
calculate.
Fecal Coliform: Monthly Median
• Instead of a monthly geometric mean limit, may
require a monthly median:
• Example how to calculate:
– 10 samples with fecal results 8,4,5,20,7,6, 34, 22, 4, 18
– List values in ascending order: 4, 4, 5, 6, 7, 8, 18, 20, 22, 34
– Find the middle value. In this example there are two middle
values, so average them: (7*8)/2 = 7.5. If there are an odd
number of values, you won’t need to find the average.
– Report the median as 7.5.
Fecal Coliforms: Annual Average
• Calculated as the arithmetic mean of the 12
monthly averages (either geometric or
median) collected during the last
consecutive 12 month period.
Reporting “Too Numerous to Count”
• When a facility reports a value of “TNTC”,
this value is translated to “20,000 values/100
mL of sample” for purposes of calculating
monthly and annual averages.
• It is recommended that laboratories use more
dilutions to be able to report a value other
than “TNTC”.
• Facilities sampling monthly for fecal may
need to consider taking additional samples.
Reporting Toxicity Data
• Acute
– Reported as % mortality for a single concentration
test.
• Chronic
– Reported as percent effluent with “No Observed
Effect Concentration”
– Minimum of two endpoints is measured in each test.
– Report the most sensitive NOEC value.
Reporting Continuous Monitoring Data
• Strip Charts:
– Visually inspect the chart and select highest
values as Max and lowest as Min.
– Daily Averages:
• Take the reading on the chart at exactly each hour of
the day (12AM, 1AM, 2AM, etc)
• Take the arithmetic average of the 24 values and
report the result on Part B as the daily average.
Reporting Continuous Monitoring Data
• Computerized Data Logging:
– the computer system should poll the continuous
monitoring instrument at frequent and uniformed
intervals.
• time between polls should be no more than 5 minutes.
– The Max (and/or Min) should be selected from all
logged (or polled) values, and recorded on Part B.
– Arithmetic average calculated based on all logged
(or polled) values.
• If polled once/5 min, 288 values/day.
Significant Figures
• When reporting averages on your DMR, the
same number of significant figures should
be shown in the average as is contained in
the least precise data point being averaged
(i.e., the data point having the smallest
number of significant figures)
Below Method Detection
• In cases where a laboratory result is reported as below
a MDL, the value should be averaged using either onehalf the MDL, or one-half the corresponding permit
limit, whichever is lower.
• In cases where the result is reported as less than a
PQL, but, greater than or equal to the MDL, the lower
MDL value should be used for reporting on the DMR
and for calculating averages.
• See example in “Tips” document.
Data Qualifier Codes
• DMR data qualifier codes help serve as indicators of
special circumstances that may be associated with data
or results
• Labs are required to use the data qualifier codes listed
in Table 1 of Chapter 62-160, F.A.C.
– These codes are not to be transferred onto the DMR
• Only the data qualifier codes listed in the “Instructions”
may be used when reporting on the DMR.