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Groundwater VOC and Fuel General Permit ORDER NO.R2-2012-0012 <br /> NPDES NO.CAG912002 <br /> environments have contaminated the sample. <br /> Flow Sample is defined as the accurate measurement of the average daily flow volume using a properly <br /> calibrated and maintained flow-measuring device. <br /> Grab Sample is defined as an individual sample collected in a short period of time not exceeding 15 <br /> minutes. Grab samples shall be collected during normal peak loading conditions for the parameter of <br /> interest, which may or may not be during hydraulic peaks. It is used primarily in determining <br /> compliance with maximum daily limits and average monthly limits. Grab samples represent only the <br /> condition that exists at the time the wastewater is collected. <br /> Instantaneous Maximum Effluent Limitation is the highest allowable value for any single grab <br /> sample or aliquot(i.e., each grab sample or aliquot is independently compared to the instantaneous <br /> maximum limitation). <br /> Instantaneous Minimum Effluent Limitation is the lowest allowable value for any single grab sample <br /> or aliquot(i.e., each grab sample or aliquot is independently compared to the instantaneous minimum <br /> limitation). <br /> Maximum Daily Effluent Limitation (MDEL) means the highest allowable daily discharge of a <br /> pollutant, over a calendar day(or 24-hour period). For pollutants with limitations expressed in units of <br /> mass, the daily discharge is calculated as the total mass of the pollutant discharged over the day. For <br /> pollutants with limitations expressed in other units of ineasurement,the daily discharge is calculated as <br /> the arithmetic mean measurement of the pollutant over the day. <br /> Median is the middle measurement in a set of data. The median of a set of data is found by first <br /> arranging the measurements in order of magnitude(either increasing or decreasing order). If the number <br /> of ineasurements (n) is odd,then the median=X�„+1�i2• If n is even,then the median= (X�Z+X�„i2�+�)/2 <br /> (i.e., the midpoint between the n/2 and n/2+1). <br /> Method Detection Limit (MDL) is the minimum concentration of a substance that can be measured <br /> and reported with 99 percent confidence that the analyte concentration is greater than zero, as defined in <br /> title 40 of the Code of Federal Regulations,Part 136,Attachment B, revised as of July 3, 1999. <br /> Minimum Level (ML) is the concentration at which the entire analytical system must give a <br /> recognizable signal and acceptable calibration point. The ML is the concentration in a sample that is <br /> equivalent to the concentration of the lowest calibration standard analyzed by a specific analytical <br /> procedure, assuming that all the method specified sample weights,volumes, and processing steps have <br /> been followed. <br /> Not Detected (ND) are those sample results less than the laboratory's MDL. <br /> Ocean Waters are the territorial marine waters of the State as defined by California law to the extent <br /> these waters are outside of enclosed bays, estuaries, and coastal lagoons. Discharges to ocean waters are <br /> regulated in accordance with the State Water Board's California Ocean Plan. <br /> Attachment A—Acronyms and Definitions A-3 <br />