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N3 <br />El <br />r� <br />Sludge Pre -application Report to the <br />.,� 1. <br />Central Valley Region on 1991 Operations at the <br />City of Tracy Sludge Land Application Site <br />Waste Discharge Requirements and <br />Monitoring and Reporting Program No. 91-160 <br />This report is to satisfy pre -application reporting Waste Discharge Requirements (WDR's) for <br />the City of Tracy's (City's) sludge land application site at K&L Farms, San Joaquin County. <br />It contains information on soil and sludge monitoring, as well as plans for application of sludge <br />during fall of 1991 and for establishment of crops on those fields. Items in the report will be <br />numbered to correspond to numbered items in the WDR's. <br />Field Characterization (5) <br />Sludge is to be applied to fields 3, 6, and 19, as numbered on Figure 2 of the Sludge <br />Management Plan (SMP). Crops grown on these fields will be alfalfa, alfalfa, and almonds, <br />respectively. <br />Sampling and Analysis Plan (1) <br />Sludge samples were composites of subsamples from representative points in sludge drying beds <br />from which sludge will be taken for land application in 1991. Samples were taken on March <br />14 and June 26, 1991. Sludge analysis methods are listed in Table 1. <br />Soil samples were taken during site characterization and during monitoring after 1990 <br />application. During site characterization, test pits were dug by backhoe and sampled, or the <br />profile was sampled with a hand auger. Samples from each representative soil layer were taken <br />from many points on the site. During 1990 monitoring, the sampling plan in Appendix A was <br />generally observed. Due to drought, coring of the soil was difficult, and the number of <br />subsamples per quadrant of each field was reduced from 10 to 4. This is still considered a .. <br />representative sample of conditions in the field. Sub -samples from representative points in each <br />field were composited into one sample for each of 2 soil layers (0 to 18 and 18 to 33 inches) for <br />each field. Soil analysis methods are listed in Table 1. <br />On some fields, no 1990 sample was taken (because sludge was not applied to these fields in <br />1990), and no test pit or auger hole samples from site characterization were analyzed. In these <br />cases, results of soil sample analysis from nearby fields will be used as background. This is <br />