AECOM Report B&W - N - City of Guelph

City of Guelph2008 Annual ReportClosed Eastview Road Landfill Site4.5 Bedrock Groundwater Quality4.5.1 Measured Exceedances of Reasonable UseNineteen bedrock-monitoring locations are currently routinely sampled at the Eastview Road Landfill. Theselocations are shown on Figure 16. Bedrock groundwater quality results are provided in Appendix C with the2008 results summarized in Table 7.Groundwater quality in the bedrock in 2008 is generally similar to previous years 9 for most parameters. Asdiscussed in previous reports, the average chloride and conductivity had been showing an increasing trendover the last few years related to an increasing trend noted most noticeably at location 37. Further, location91-I has also shown variable elevated chloride as well. These will be discussed further below. No otherleachate indicator parameters showed any changes. As this was the case, both 37-I and 91-I continue to beexcluded from the above table.Table 7. Summary of Bedrock Groundwater Quality During 2008ParametersBedrock Groundwater SummaryAvg. Min Max. SamplesGeneralpH 8.29 8.1 8.4 56Conductivity (μS) 458 279 776 56Alkalinity (mg/L) 207 149 347 56Hardness (mg/L) 198 75 410 56Critical Indicators Chloride (mg/L)