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City of Stockton - 6 - 13 December 2000 Pretreatment Compliance Audit compromises worker and public safety. Specific discharge prohibitions 40 CFR 403.5(b)(1) and 403.5(b)(7) limit acceptable discharges. Tire City shall immediately evaluate and report to the Regional Board how the sulfide corrosion problem is being addressed. Pursuant to 40 CFR 403.5(c),POTWs must periodically review the adequacy of local limits when the NPDES permit is revised or renewed. Additionally local limits are to be technically based. The City must continue working with Regional Board staff on local limits development. FILE REVIEW The U.S. Environmental Protection Agency(USEPA) Audit Checklist (1992, revised August 2000)was used as a guide to complete the following SN file reviews: 1. Vikron, a metal finishing/circuit boards type industry, is classified by the City as a CIU under 40 CFR 433.17. Onsite pretreatment includes a collection tank, pH adjustment, metal precipitation and flocculation, and clarification. Collected metal solids are filter-pressed and hauled to an off-site facility for recycling. The average total discharge flow is 167,564 gallons per day(gpd). This facility was inspected as part of the Audit. 2. Corn Products Company, a facility that manufactures animal feeds, cornstarch, com germ, starch and corn syrup, is classified by the City as a non-categorical SN. This facility operates on a year-round basis. Waste lube oils are removed by a private contractor. The facility is permitted to discharge up to 26 million gallons of wastewater per month. The average total discharge flow is 666,500 gpd. A Slug Discharge Control Plan could not be identified within the file by State inspectors or the ECO for this facility. This facility was inspected as part of the Audit. 3. American Sunny Food, a rice processor, is classified as a non-categorical SILT by the City. Rice is washed and dewatered. Wash water resulting from cleaning is sent to on-site pretreatment facilities to reduce BOD and TSS prior to discharge to the sewer. Pretreatment includes primary clarification, activated sludge and secondary clarification. The average total discharge flow is 18,110 gpd. 4. Sumiden Wire Products Corporation is a CIU classified by the City as an iron and steel wire and strand manufacture as identified under 40 CFR 420.95. Pickling rinse water is discharged after pH adjustment between a range of 5-9. The neutralization system includes an automated feed for caustic soda. The average total discharge flow is 43,535 gpd. 5. Delta Plating is a CN classified by the City as an existing electroplating point source under 40 CFR 413.14. Onsite pretreatment processes include collection, pH adjustment, metal precipitation, flocculation and clarification. Collected metal solids are filter-pressed and hauled to an off-site facility for recycling. The average total permitted discharge flow is 200,000 gpd. This facility was inspected as pan of the Audit.