COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

y INFORMATION SHEET -2- SHELL OIL COMPANY STOCKTON BULL'„ FUEL DISTRIBUTION FACILITY WASTEWATER TREATMENT SYSTEM DISCHARGE SAN JOAQUIN COUNTY C. Compounds containing nitrogen are added in the batch treatment process to promote bacteria growth to enhance removal of fuel constituents. Although there is no effluent limit for total nitrogen or ammonia, there is a requirement that there be no acute toxicity in undiluted effluent. Monthly monitoring for acute toxicity is required in order to prevent any toxicity problems from ammonia. Effluent and receiving water monitoring for ammonia is required to assess actual discharged concentrations and its impact on the receiving water. The receiving Nvater limit for dissolved oxygen has been set at 6.0 mg/l, from 1 September to 30 November, and at 5.0 mg/1 for the rest of the year in order to implement water quality objectives contained in the Water Quality Control Plan for Salinity, San Francisco Bay/San Joaquin Delta Estuary. The permit contains effluent and receiving water temperature limitations which are contained in the Thermal Plan. Although the discharge may be as high as 230,000 gpd when the discharge is occurring, the discharge will only occur up to two times per month, so it is considered to be low volume for purposes of compliance with the Inland Surface Waters Plan and Enclosed Bays and Estuaries Plan. Because it is a low volume discharge, the Discharger is not required to characterize the discharge for the constituents contained in Tables I and 2 of the Inland Surface Waters Plan. For those constituents regulated by the Plans. effluent limitations provide adequate protection of water quality, and compliance with numerical water quality objectives. Chronic toxicity monitoring is not proposed because the discharge will be low volume and intermittent. The San Joaquin River is expected to provide considerable dilution.