SITE INFORMATION AND CORRESPONDENCE

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City of Stockton v _ 10 - 13 December 2000 Pretreatment Compliance Audit Recommendation: Any categorical discharger with production-based limits should be clearly identified. Assumptions and calculations used to develop the limits should be clearly stated including sample calculations. INDUSTRIAL USER SITE INSPECTIONS Robert Fagemess, Christyl Escarda, and Ryan Lodge of the Regional Board and Diana Robles of the State Water Board carried out a site inspection of the Delta Plating facility. The inspection at the Viktron facility was conducted by all three of the Regional Board staff with the follow up inspection by Robert Fagemess and Ryan Lodge of the Regional Board. Robert Fagemess and Ryan Lodge of the Regional Board also conducted an inspection of the Corn Products facility. Frank Tucker accompanied the State inspectors on the visit to Viktron and Corn Products while Richard Stiffler accompanied State inspectors on the inspection of the Delta Plating facility. Delta Plating pretreats wastewater for metals to meet categorical and local limits. The interior of the facility, treatment processes, pretreatment process, and sampling station were inspected. The owner/operator of the facility indicated to State inspectors that the daily discharge is roughly 3,500 to 3,800 gpd. The facility currently does not have an industrial stormwater permit, which is required of all metal finishing industries. Two 55-gallon unlabeled drums (presumed to be acid) were located within the plating bath area near an open roll-up door facing the street. There were no restraining mechanisms in place (while door is open) to prevent the drums from accidentally tipping and spilling to the outside and into storm drains. A nylon screen with rubber band covered the 8-inch sewage overflow/cleanout which is outside and accessible to the public. The facility operator indicated a brass cover was stolen from the overflow and that the screen was the solution. This appears to be a public safety hazard. Recommendation: The City should require Delta Plating to provide a more permanent and safer sewer overflow cap cover than is currently in place. The facility has been referenced to the appropriate Regional Board unit for industrial storm water permitting. Corn Product Company is a non-categorical SN which manufactures animal feeds, cornstarch, com germ, starch and com syrup on a year-round basis. The ECO and Board staff inspected the facility on 13 September 2000. The pH adjustment area and monitoring location were inspected. The pH, flow monitoring and sample collection appeared appropriate given the requirements of the City's permit. It was apparent that spillage from the pH adjustment tank had occurred and caused considerable corrosion to the base of the tank (see photos). The accompanying ECO stated that this must have been a relatively recent spill, as the staining was not noted during his previous visit. There was no report of an