SITE INFORMATION AND CORRESPONDENCE_CASE 2

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City of Tracy -3- 8 July 1988 I met Robert Sagaser, Environmental Control Inspector, who will be handling the City's pretreatment program. I reviewed the pretreatment files and noticed that the IU permits were not in the files. Also, the files need to be more organized and kept in a central location. These two issues were noted in the January 1987 EPA pretreatment audit report sent to the City in July 1987 . The City told us that all other issues were addressed in a draft copy of new City ordinances. The draft is currently being reviewed by the City attorney and will be presented to the City Council for adoption at a later date. I requested a copy of the draft ordinances and informed John Baker that we should review it prior to adoption by the City Council. A separate letter was sent requesting a copy and a copy was received in May 1988 . John Baker stated he needed a letter from our office stating approval for his personnel to repair a manhole located in a spill area. A gasoline spill went into the manhole in April 1987 and the contractor involved in the incident had been directed to cease work until the spill was cleaned up. I informed Mr Baker that the City could proceed with repair of the manhole (since all contaminated soil was removed from the spill site) . I asked if a letter was necessary. Mr Baker stated he would not begin work until he received a letter of approval from our office. Following the inspection report, Table 1 and 2 (attached) show the sample results for the Tracy-STP inspection. The results indicate that the Tracy-STP is meeting its WDRs and no discharge violation occurred during the inspection. However, we are concerned with the high TDS in the effluent. More frequent sampling should be done to determine if the high TDS is a continuing problem and confined to the wastewater treatment system. The water supply system and receiving waters should be sampled to develop background information and to define the effects that the TDS is having on the receiving waters. Source control may have to be considered by the City as a means of reducing the TDS. An EPA 601 analysis was performed on the Tracy-STP effluent and bromodichloromethane and chloroform were detected at 0. 6 ug/l and 2 .4 ug/1, respectively. These constituents are commonly found in effluent due to chlorination. Both constituents are within acceptable limits. I have reviewed the monitoring reports submitted by Tracy-STP for the past six months and they reported a total of three violations. All three violations were for exceeding the daily maximum limit for effluent total coliform (500 MPN/100 ml) . However, Darrell Scott stated the chlorine residuals taken at the chlorine contact chamber were above the minimum limit of 5 mg/l required for proper disinfection at the plant and it was unclear why the limits were exceeded. No other significant violations were reported for the past six months.