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ON'e,OF TRq cA o� CITY OF TRACY z Utilities Division 3900 Holly Drive Telephone: (209)836-1650 fti�oRPORP��°� Tracy, CA 95376 Fax: (209)836-0932 March 18, 1996 Lauren Fondahl Sludge Coordinator Permits Section (W-5-2), EPA Region 9 75 Hawthorne Street San Francisco, Ca. 94105 Subject: 1995 Annual Sludge Monitoring Report;EPA 503 Monitoring Requirements Dear Ms. Fondahl: I am submitting here our required EPA 503 annual sludge monitoring report. This data was collected during the calendar year, 1995. Background Information The City of Tracy operates a State approved land application program (Order No. 91- 160). The City applies air dried sludge on approximately 2000 acres of City and farmer owned land, at agronomic rates. During calendar year 1995, the City applied 2229 dry short tons or 2023 dry metric tons of sludge on 502 acres. These amounts allow for estimated sand in the sludge. Based on the EPA monitoring criteria, a total of six quarterly samples must be collected per year at this application rate and monitored for the EPA 503 criteria. The City applies anaerobically digested sludge to air drying beds and the sludge dries for at least three months before application. Sludge is stockpiled in the air drying beds and applied in the fall or spring of each year. Sampling Procedures Six composite samples of air dried sludge were collected before sludge application. Metals and nutrient analyses were performed on these. Six grab samples were also collected bfore application and analyzed for the 503 pathogens. A copy of the sampling plan is being included for reference. Full core samples, as specified in the plan, could not be physically collected with an auger Therefore, the beds were disected with a front-end loader at the indicated locations and full depth composites collected at each. 1