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applicable categorical Pretreatment Standard. If 40 CFR Part 136 does not <br />contain sampling or analytical techniques for the pollutant in question, or <br />where the EPA determines that the Part 136 sampling and analytical <br />techniques are inappropriate for the pollutant in question, sampling and <br />analyses shall be performed by using validated analytical methods or any <br />other applicable sampling and analytical procedures, including procedures <br />suggested by the Director or other parties approved by EPA.The Director <br />may require more sensitive analysis if reported pollutant concentrations <br />are not sufficient to determine compliance with Pretreatment Standards or <br />to determine if such Standards are necessary. <br />(2) Sample Collection <br />b. Except as indicated in Sections 3 c and -4— d below, the <br />User must collect samples using 24 -hour flow proportional <br />composite sampling techniques unless time - proportional composite <br />sampling or grab sampling is authorized by the Director. Where <br />time - proportional composite sampling or grab sampling is <br />authorized by the Director, the samples must be representative of <br />the discharge. Using pfetoeels (inelud: V appropriate preservation) <br />speeified in nn Gran nn..t 136 and appropriate EPA :donee <br />multiple grab samples eolleeted dnr:ng a 24 haul n ed may he <br />a »� »'r a re__ _ __ °_� __ <br />..:ted prior , to laboratory analysis as follows: f r e yanide, <br />ntnl ..Len eln and .lade. the samples be eemposited the may <br />lab the field; f r volatile erganie e^ompoouna°- and -eil <br />d nn., the n n... l pan may e n n....no sited in the laberatery. !'_ ab <br />le <br />samples may ee required to show a rm nlianee with ins mtaneo <br />.e <br />l <br />(w) Bypass <br />(4) Bypass Prohibition <br />(b) The Director may approve an anticipated bypass, after <br />