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CALIFORNIA REGIONAL WATER QUALITY CONTROLBOARD <br /> CENTRAL VALLEY REGION <br /> MONITORING AND REPORTING PROGRAMNO. 5-00-119 <br /> ATTACHMENT B TO GENERAL ORDER NO. 5-00-119 <br /> FOR DISCHARGE TO SURFACE WATERS <br /> OF GROUND WATER FROM CLEANUP OF <br /> PETROLEUM FUEL POLLUTION <br /> INFLUENT MONITORING. <br /> Influentsamplesshall be collected after the last connection before the wastes enter the treatment process. <br /> Influent samples should be representative of the volume and nature of the influent. Time of collection of <br /> a grab sample shall be recorded.. The following shall constitute the influent monitoring program: <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Total Petroleum Hydrocarbons mg/1• Grab Monthly <br /> (Gasoline, diesel,motor oil) <br /> Benzene 99/1 Grab Monthly <br /> Toluene µg/1 Grab Monthly <br /> Ethylbenzene nd Grab Monthly . <br /> Xylene(Total) µg/1 Grab Monthly <br /> Methyl Tertiary Butyl Ether nd Grab Monthly <br /> (MTBE)** <br /> Lead (total)* ug/l Grab Monthly <br /> Methanol** µg/1 Grab Monthly <br /> Ethanol** µg/1 Grab Monthly <br /> Tertiary Butyl Alcohol(TBA)** µg/1 Grab Monthly <br /> Di-isopropyl ether(DIPE)** µgli Grab Monthly <br /> Ethyl Tertiary Butyl Ether(ETBE)** µg/1 Grab Monthly <br /> Tertiary Amyl Methyl Ether µfill Grab Monthly. <br /> (TAME)** <br /> * If lead is not detected in the.first Z sampling events,then testing maybe discontinued thereafter. <br /> **if these constituents are not present in any monitoring well'or extraction well at the cleanup site,the monitoring well <br /> documentation may be submitted in lieu of the influent monitoring for these constituents. Confirmation samples on an <br /> annual basis shall be submitted to verify the absence of these chemicals.If three consecutive monthly influent sampling <br /> events result in non-detectable.concentration,at appropriate detection limits,then the sampling frequency shall be <br /> reduced to Quarterly. If threeconsecutive quarterly sampling events results in non-detectable concentration, at <br /> appropriate detection limits,then the sampling frequency shall be reduced to annually.If a detectable concentration is <br /> determined to be present.in the wastewater the frequency will be monthly. <br />