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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br />CENTRAL VALLEY REGION <br />MONITORING AND REPORTING PROGRAM <br />ATTACHMENT B TO GENERAL ORDER NO. 92-150 <br />FOR DISCHARGE OF <br />GROUND WATER FROM CLEANUP OF <br />PETROLEUM FUEL POLLUTION <br />TO SURFACE WATERS <br />INFLUENT MONITORING <br />Influent samples shall be collected after the last connection before the wastes <br />enter the treatment process. Influent samples should be representative of the <br />volume and nature of the influent. Time of collection of a grab sample shall be <br />recorded. The following shall constitute the influent monitoring program: <br />Constituents <br />Units <br />Type of <br />Sample <br />Sampling <br />Frequency <br />Total Petroleum Hydrocarbons <br />mg/l <br />Grab <br />Monthly <br />Benzene <br />Ethylbenzene <br />Ag/l <br />ug/I <br />Grab <br />Grab <br />Monthly <br />Monthly <br />Toluene <br />Xylene <br />ug/1 <br />ug/1 <br />Grab <br />Grab <br />Monthly <br />Lead (total)* <br />mg/l <br />Grab <br />Monthly <br />Monthl <br />EFFLUENT MONITORING <br />Effluent samples shall be collected downstream from the last connection through <br />which wastes can be admitted into the outfall. Effluent samples should be <br />representative of the volume and nature of the discharge. Time of collection of <br />a grab sample shall be recorded. The following shall constitute the effluent <br />monitoring program: <br />* If lead is in ground water. <br />** 1) Analyses shall be conducted weekly for four consecutive weeks following <br />initial discharge from the treatment system. 2) If any sample shows <br />Type of <br />Sampling <br />Constituents <br />Units <br />&=I* <br />Frequency <br />Specific Conductivity <br />,Mhos/cm <br />Grab <br />Monthly <br />PH <br />pH units <br />Grab <br />Monthly <br />Flow <br />gpd <br />Cumulative <br />Monthly <br />Total Petroleum Hydrocarbons <br />mg/l <br />Grab <br />Monthly** <br />Benzene <br />wg/l <br />Grab <br />Monthly** <br />Ethylbenzene <br />,cog/1 <br />Grab <br />Monthly** <br />Toluene <br />ug/1 <br />Grab <br />Monthly** <br />Xylene <br />µg/1 <br />Grab <br />Monthly** <br />Lead (total)' <br />ug/l <br />Grab <br />Monthly** <br />Bioassay*** <br />% Survival <br />Grab <br />Monthly <br />* If lead is in ground water. <br />** 1) Analyses shall be conducted weekly for four consecutive weeks following <br />initial discharge from the treatment system. 2) If any sample shows <br />