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3. Anatytical and Samoline Methods Cor lVtonitorine u The petmittee shall install, calibrate, use, and maintain monitoring methods and equipment, including biological and ,,.etc pollutant-monitoring methods. All sampling shall be performed by the petmittee according to specified methods in 40 C.F.R. 136; methods approved by EPA pursuant to 40 C.F.R. Part 136; or methods approved by the Division, in the absence of a me specified in or approved pursuant to 40 C.F.R part 136. The analytical method selected for a parameter shall be the one can measure the lowest detected limit Cor that parameter unless the permit limitation or stream standard for t parameters not limited, is within the testing range of another approved method. When requested in writing, the Division approve an alternative analytical procedure or any significant modification to an approved procedure. When the most sensitive analytical method which complies with this part, h: s a detection limit greater than or equal to the p~ limit, the pernittee shall report "less than (the detectable limit)," as appropria:e. Such reports shall not be considered as viola of the permit limit. The present lowest method detection limits for specific paramzters (which have limitatioru which are, in cases, less than or equal to the detecton limit) are as follows: Effluent Characteristic Method Detection Limits, ua!1 Arsenic 10 Cadmium 0.5 Chromium 10 Chromium, Hexavalent 10 Copper 5 Lead 5 Mercury 0.003 Nickel 20 Phenols 50 Selenium 10 Silver 0.2 Zinc 10 • These limits apply to the total recoverable, dissolved, or the potentially disso:ved fraction of metals. For hexavalent chromium, samples must be unacidified so that dissolved concentrations will be measured rather than pore dissolved concentrations. 4. Records The perrrittee shal] establish and maintain records. Tbose records shall include the following: (a) The date, type, exact locatioq and time of sampling or measurements; (b) The individual(s) who performed the sampling or measurements; (c) The date(s) the analyse; were performed; (d) The individual(s) who performed the analyses; (e) The analytical techniques or methods used; (f) The results of such analyses; and ' (g) Any other observations which may result in an impact on the qualir: or quantity of the discharge as indicated in 4 122.44 (i)(1)(iii). The permittee shall retain for a minimum of three yeah records of all mcnitonne information, including all original stri recordings for continuous monitoring instrumentation, all calbration and ma_ztenance [ecords, copies of all reports required permit and records of all data used to complete the application for this per:ct. This period of retention shall be extended dtu course of any unresolved litigation regarding the discharge of pollutants by the permittee or when requested by the Divi EPA.