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• ! <br />Fremont sewage sludge samples contain significant concentrations of nitrogen and phosphorous forms, <br />barium, copper, lead, molybdenum, nickel, selenium, silver and zinc. Paste sludge samples have a pH <br />ranging between about 6.5 and 8.0. <br />As part of the Hydrogeologic Assessment performed in 1998, CKD/sludge samples were collected for <br />leach testing on September 11, 1998 and submitted to the laboratory. The purpose of the leach testing <br />was to evaluate what constituents of the CKD/sludge mixture could potentially be leached out either <br />by ground water flowing through the material or rainfall infiltrating through the material to the ground <br />water. Samples were collected using glass jars, provided by the laboratory, to collect material recently <br />(i.e., within less than two hours) placed in the landfill area. In collecting the samples, care was taken <br />to get a representative sample of both the CKD and the sewage sludge in the approximate proportions <br />in which they are placed in the landfill. Analyses of the CKD/sludge samples were performed by <br />Technology Laboratory, Inc. of Fort Collins, Colorado. <br />CKD/sludge samples were analyzed for the following parameters using a modified Toxicity <br />Characteristic Leaching Procedure (TCLP) and the Synthetic Precipitation Leaching Procedure <br />(SPLP). The TCLP testing was performed using ground water from Monitoring Well MW-6 as the <br />leaching fluid, which had a pH of 7.01. The SPLP testing was performed with an extraction fluid <br />which simulated rain water west of the Mississippi River and had a pH of 5.1. The EPA methodology <br />used for the leach tests are summarized in the following table. <br />KS-9903-02 Page 5 K-S &Company <br />August 16,1999 Copyright 1999 <br />