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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 ATTACHMENT A— DEFINITIONS Arithmetic Mean (µ) Also called the average, is the sum of measured values divided by the number of samples. For ambient water concentrations, the arithmetic mean is calculated as follows: Arithmetic mean = µ = Ex/ n where: Ex is the sum of the measured ambient water concentrations, and n is the number of samples. Average Monthly Effluent Limitation (AMEL) The highest allowable average of daily discharges over a calendar month, calculated as the sum of all daily discharges measured during a calendar month divided by the number of daily discharges measured during that month. Average Weekly Effluent Limitation (AWEL) The highest allowable average of daily discharges over a calendar week (Sunday through Saturday), calculated as the sum of all daily discharges measured during a calendar week divided by the number of daily discharges measured during that week. Bioaccumulative Those substances taken up by an organism from its surrounding medium through gill membranes, epithelial tissue, or from food and subsequently concentrated and retained in the body of the organism. Carcinogenic Pollutants are substances that are known to cause cancer in living organisms. Coefficient of Variation (CV) CV is a measure of the data variability and is calculated as the estimated standard deviation divided by the arithmetic mean of the observed values. Daily Discharge Daily Discharge is defined as either: (1) the total mass of the constituent discharged over the calendar day (12:00 am through 11:59 pm) or any 24-hour period that reasonably represents a calendar day for purposes of sampling (as specified in the permit), for a constituent with limitations expressed in units of mass or; (2) the unweighted arithmetic mean measurement of the constituent over the day for a constituent with limitations expressed in other units of measurement (e.g., concentration). The daily discharge may be determined by the analytical results of a composite sample taken over the course of one day (a calendar day or other 24-hour period defined as a day) or by the arithmetic mean of analytical results from one or more grab samples taken over the course of the day. For composite sampling, if 1 day is defined as a 24-hour period other than a calendar day, the analytical result for the 24-hour period will be considered as the result for the calendar day in which the 24-hour period ends. Detected, but Not Quantified (DNQ) DNQ are those sample results less than the RL, but greater than or equal to the laboratory's MDL. Sample results reported as DNQ are estimated concentrations. Dilution Credit Dilution Credit is the amount of dilution granted to a discharge in the calculation of a water quality- based effluent limitation, based on the allowance of a specified mixing zone. It is calculated from the ATTACHMENT A- DEFINITIONS A-1