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0 0 INFORMATION SHEET SHELL OIL COMPANY STOCKTON BULK FUEL DISTRIBUTION FACILITY WASTEWATER TREATMENT SYSTEM DISCHARGE SAN JOAQUEN COUNTY Shell Oil Company proposes to operate a wastewater collection, treatment, and disposal system at the Stockton Bulk Fuel Distribution Facility, located on Rough and Ready Island. Wastewater is to be discharged to the San Joaquin River. The primary wastewater source is from groundwater containing petroleum hydrocarbons. Wastewater will flow through a CPI separator, followed by a 600,000 gallon equalization tank, then be treated in a fluidized bed biological reactor. Treated wastewater will be stored in a 230.000 gallon tank for settling of solids and monitoring to determine compliance with this Order prior to the tank contents being discharged to the San Joaquin River. Additional treatment will be provided, if necessary, in order to meet the effluent limitations. Storm water runoff from the tank farm area is proposed to be discharged to the San Joaquin River without treatment, following visual inspection. Analytical results of a storm water sample showed non-detectable concentrations of benzene, toluene, xylene, ethyl benzene, and total petroleum hydrocarbons. Effluent limits have been established as follows: a. Total Petroleum Hydrocarbons (TPH), Benzene, Ethylbenzene. Toluene, and Xylene are established as 'non-detected', that is, less than the detection concentrations for specified, commonly available analytical technology. The effluent limit for lead is established at S ltg/l, somewhat greater than the water quality objective for lead for this section of the San Joaquin River, but less than a water quality based effluent limitation. These limitations represent the Best Available Technology Economically Achievable, based on best professional judgement, because existing wastewater treatment technology, primarily utilizing air stripping and/or activated carbon, is capable of dependably removing these constituents to the spe.ified levels. It is not certain that the proposed treatment technology (fluidized bed biological reactor) will consistently remove hydrocarbons to the levels set by the effluent limitations. Therefore, effluent monitoring for fuel constituents is required to be completed on each batch of treated wastewater to assure compliance with effluent limits prior to initiating each discharge period. If the effluent is not in compliance with effluent limits, the discharger must operate additional treatment units to meet the limits. b. BOD and suspended solids concentrations are established at 10 mg/l each, because the San Joaquin River regularly experiences episodes of critically low dissolved oxygen concentrations (<5 mg,l). Effluent monitoring for these constituents is required to be completed on composite samples collected over the duration of each batch discharge.