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r_1 LJ � o`�Y OF 011. zRgOr ITV OF TRACY Utilities Division \ 3900 Holly Drive Telephone: (209) 836-1650 Tracy, CA 95376 Fax: (209) 836-0932 w CORPOVI, Samples for pathogen analyses have also been collected during the last month. In this case, as per the attached map, one grab sample was collected from the center of each bed. Each grab sample was collected with a sterile scoop and of material extending from the surface of the bed to the underlying sand layer. These samples will be evaluated and additional pathogen samples may be taken after the material has been stockpiled and exposed to further drying. Soil samples were taken in May, 1994. Subsamples from representative points in.each of last year's sludge applied fields were composited into one sample for each of 2 soil layers (0 to 18 and 18 to 33 inches) for each field. Samples were composited from samples collected as per Figure Al. Additional documentation of this sampling is being included. Background and Soils Monitoring Results and Interpretation (3) Results of recent soils background monitoring are shown in Table 2. pH values in the samples from field # 1 were less than 6.5. No explanation is available for this at the present time. Verification of Nonhazardous Classification of Sludge (6) The source of sludge, the City's Wastewater Treatment Plant, and the users of the collection system, have not changed significantly since 1989. Certification by the California Department of Health Services that the sludge is nonhazardous was included in Appendix D of the SMP, and may be reviewed by referring to that document. Sludge Characteristics (4) Sludge quality is shown in results of monitoring analyses listed in Table 3. Criteria for hazardous and designated waste classification are provided for comparison. Sludge quality remains within the limits set by these criteria. As specified in the WDR's, PCB analyses are presented, and levels are well below those specified in Title 22 for hazardous wastes. Sludge treatment meets standards for a process to significantly reduce pathogens. Sludge has been air-dried on underdrained, sand drying beds since June 24, 1994. Time will total three months by application and will include the summer months, when temperatures are well in excess of the stipulated 2 months at 0 degrees C. Treatment plant operations log sheets are being submitted to document this.