Data Qualifier Handling:

From http://www.deq.state.or.us/wq/wqpermit/docs/domdmrinstr.pdf

2.4.3.3 Analytical Results Less Then Quantitation Level
Unless the Department instructs the Permittee in writing to do otherwise, the following procedures are to be used for analytic results that are less than the quantitation level:
A. Sample result at or below detection level
If a sample result is at or below the detection level, report the result as less than the specified detection level. For example, if the detection level is 1.0 ug/L and the result is non-detect, report “<1.0 ug/L” on the DMR.

B. Sample result above detection level but below quantitation level:
If a sample result is above the detection level but below the quantitation level, report the result as the detection level preceded by the DEQ data code “e”. This code identifies the result as being between the detection level and quantitation level. For example, if the detection level is 1 ug/L and the quantitation level is 5 ug/L and the sample result is 4 ug/L, report “e1 ug/L” on the DMR.

Arithmetic average: If a sample result is below the detection limit, use zero for that sample in the calculation of the arithmetic average. If the sample result is greater than the detection limit, but less than the quantitation limit, use the detection limit value for that sample in the calculation of the arithmetic average.

Geometric mean: Values of zero cannot be used to calculate a geometric mean. If a sample result is below the detection limit, one-half the detection limit should be used in the calculation of the geometric mean for all pollutants except bacteria. For bacteria results less than the detection limit, use the detection limit value for that sample to calculate the geometric mean.

Weekly Averages:

Use Week Definition 18, e.g. WAVG18(Cx)

2.6.4 Weekly Average Maximum
A week is defined as a calendar week beginning on Sunday and ending on Saturday in Schedule F, Section E (Definitions) of the permit. Any variation in the definition of a week will be defined in the facility’s permit. Refer to Schedule A of the permit to determine which parameters have weekly average discharge limitations. For those parameters, calculate weekly averages (see discussion of calculating averages below) for each week and record the highest value calculated. If a calendar week falls between two reporting months, the weekly average is still calculated once all of the data is available. The value may be reported in the month’s DMR that has the majority of days from the week that spans the two months.

Obsolete Templates:

OR_WW_DMR1.ss3  Oregon DMR Page 1

SPD 11/02/2009

OR_WW_DMR2.ss3  Oregon DMR Page 2

SPD 11/02/2009

OR_WW_DMR.ss3  Oregon DMR Page

SPD 11/02/2009

OR_WW_DMRBIG.ss3  Oregon DMR Page

SPD 11/02/2009