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INFORMATION SHEET ORDER NO. R5-2003-0044 _2- GENERAL ORDER FOR LAND DISPOSAL OF GROUNDWATER OR SURFACE WATER FROM CLEANUP OF PETROLEUM POLLUTION Effluent limits have been established as follows: a. 30-Day Median Concentrations for TPH, benzene, ethylbenzene, toluene, xylenes and MtBE are established as less than the quantitation or reporting limits, that is, less than the levels that can be quantified for specified, commonly available analytical technology. A 'median' is used rather than an 'average' or 'arithmetic mean' to allow for the quantitation of a constituent in individual samples without automatically causing violation of the monthly limitation, as would occur with an'average' or'mean'limit. The current treatment technologies used for groundwater cleanup of petroleum fuel constituents are not normally subject to sudden upset or bypass, so rapid changes in effluent quality are not expected. If detectable concentrations of petroleum fuel constituents are found, the monitoring program requires immediate evaluation of the treatment system and weekly monitoring of the effluent until less than quantitation (or reporting) limit conditions are reestablished. The effluent sampling is not a substitute for process control monitoring by the Discharger. b. Daily Maximum Effluent Limitations are established to allow for some effluent quality variation without exceeding water quality objectives. In general,there will not be more than one sample taken in a month. However, should operational problems require more frequent monitoring, the daily maximum numbers will enable a discharger to increase the frequency of monitoring while correcting the operational problems and remain in compliance with waste discharge requirements. The following table shows water quality objectives and numerical limits used to interpret the objectives for each monitored constituent. The lowest of these limits for each chemical is selected as the maximum effluent limitation to comply with all water quality objectives. Where the lowest limit is lower than the analytical quantitation limit,the quantitation limit is used as the effluent limit. Constituent W Q Objective Limit Reference for Limit (lig/1) Benzene Chemical Constituents 1.0 California Primary MCL Toxicity 0.15 California Public Health Goal Taste and odors 170 Taste and Odor Threshold Ethylbenzene Chemical Constituents 700 California Primary MCL Toxicity 300 California Public Health Goal Taste and Odors 29 Taste and Odor Threshold Toluene Chemical Constituents 150 California Primary MCL Toxicity I50 California Public Health Goal Taste and Odors 42 Taste and Odor Threshold Xylenes(sum of Chemical Constituents 1750 California Primary MCL isomers) Toxicity 1800 California Public Health Goal Taste and Odors 17 Taste and Odor Threshold Diesel or Kerosene Toxicity 56 to 140 USEPA Superfund Provisional Reference Dose Taste and Odors 100 1 Taste and Odor Threshold