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Table 6-5 (DHS Table M) QUANTITIES OF NEW HAZARDOUS WASTE STREAMS IN THE COUNTY PROJECTED TO THE YEAR 20001 (TONS) (Continued) 1 . According to Robert Evans of the RWQCB, there are seven publicly owned treatment works (POTWs) in San Joaquin County. Four POTWs have pretreatment programs: Manteca POTW, Lodi POTW, Tracy POTW, and Stockton POTW. 2. Only qualitative information is available. No industries were out of compliance at the Manteca POTW in 1986 (Personal communication with Jim Podesta, September 2, 1988) . One plating industry was out of compliance at the Lodi POTW, and could add 0.11 ton of metal (metal concentration in sewage that will be settled out in pretreatment) . This could result in an unknown quantity of metal,- containing liquid and sludge (personal communication with Frank Beeter, Lodi POTW, September 2, 1988) . Tracy has no industries out-of-compliance but a new industry will be entering its pretreatment program (personal communication with John Baker) . At the Stockton POTW, a number of industries move, in and out of compliance in their pretreatment program. These include the metal plating industries, one wood processing cornpany (McCormick and Baxter) , and one transporting company (Union Pacific) that accumulated oil and grease. The plating companies have been out- of-compliance for copper, lead, chromium, nickel , and pH levels. To deal with these fluctuations of excess heavy metals and high pH levels, the Stockton POTW is implementing a self-monitoring program involving continuous or frequent sampling, instead of the grab samples used in the past. Managers of the Stockton POTW hope that the combination of (1) more industry involvement, (2) penal - ties for noncompliance, and (3) better industrial awareness concerning the causes of noncompliance will lead to better compli- ance. The amount of additional pretreatment metal -containing sludge will depend on the types of pretreatment implemented and their success. 3. Ran' -Rob, a computer parts manufacturing company presently operat- ing in Oakland, plans to move to Tracy. As a result of abrasive cleaning of steel and aluminum steel parts Ran-Rob produces a hazardous metal -containing waste, which is discharged to a settling tank. The rectangular tank has an area of 66 square feet, and fills up with 1 foot of sludge and 3 feet of water, for a total of 66 cubic feet of metal -containing sludge and 198 cubic feet of metal -containing liquid. The tank is emptied once every 2 to 3 years by IT and manifested as hazardous waste. (Personal communication with Siegried Brian and Scott Heaves of Ran-Rob, August 24, 1988. ) PJ9 9390502.000 6-24 Rev. 0 11-10-88