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• LEACIIATE TESTING RESULTS Leachate tests were conducted on refuse samples taken on four separate dates since August, 1985. It is anticipated that these samples provide a representative range of refuse variation. The tests were conducted by mixing a one to one ratio by weight of refuse material and distilled water and allowing the paste to equilibrate for approximately 24 hours. The liquid was then decanted from the mixture and subjected to chemical analysis. The laboratory testing reports are provided in Attachment 4. The results of the testing are summarized in Table 2. The pH of the Leachate is alkaline at about 9.0, indicating little possibility for generation of acid Leachate. The alkaline plI of the Leachate is consistent with the results of two solids analyses of the refuse material showing low pyritic sulfur content in the range of 0.08% - .27%. Sodium accounts for over 40% of the dissolved solids leached from the refuse materials. sodium concentrations in the Leachate ranged from 215 to 550 mg/1 with corresponding SAR of 22-68. These SAR's are approximately 30 times lower than the calculated allowable Leachate SAR which, after mixing with ambient river flow, will • meet the North Fork ISS SAR of 3 as shown in Table 2. The majority of the remaining dissolved solids consist of the anions sulfate, chloride or bicarbonate. The total dissolved solids of the Leachate is approximately 700 mg/1 and is a factor of 300 times lower than the theoretically calculated allowable Leachate concentration. It should be noted here that the calculation of the allowable Leachate concentration is provided to gain perspective on the magnitude of Leachate impacts and not to advocate an acceptable Leachate quality. The comparison of the measured Leachate quality with the calculated allowable Leachate quality shows that less than one percent of the stream loading capacity (the difference between the existing concentration and the ISS) is used by discharging Leachate into the North Fork when considering that the actual amount of dilution will probably be 100 times greater than has been assumed in the calculations. Arsenic, boron, cndmium, chloride, manganese, nitrate, lead, selenium and zinc Leachate concentrations are below or within a [actor of approximately 2 of meeting the ISS without any dilution and therefore are not anticipated to cause any water quality degradation in the North Fork based on the test results. Copper appears to • have the largest impact on a percentage basis, using approximately 104'0 of the