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~LAFARG E <br />NORTH AMERICA <br />Construction Materials <br />2 SUMMARY OF CURRENT RESULTS <br />2.1 Measurement and Data Handling <br />Using the field data logs for each well, in addition to the specified standard procedures, <br />groundwater elevation data has been collected between the dates of January 2002 and present. <br />See included well log sheets in Appendix A. The current data set exceeds the Division <br />recommended mutimum of five quarters of monitoring, however baseline monitoring will <br />continue on a quarterly basis until mining operations commence. <br />2.2 Data Analysis and Interpretation <br />Data from the time period between January 2002 and start of dewatering will be the baseline pre- <br />mining data points. DS03-MW03 was damaged by farm equipment and will be replaced as soon <br />as possible; no data is available for DS03-MW03 past February 2004. Mining data points will be <br />compared to these values to deterntine if mitigation efforts are necessary. The largest and the <br />smallest data points for each welt were first reviewed for accuracy. No outliers were identified; <br />all recorded data fell within seasonal expectations. The tolerance limits, the smallest and largest <br />values of the data, were then determined. The current upper and lower tolerance limit, <br />highlighted in the well logs with green and yellow, respectively; and seasonal averages for each <br />well is summarized in the table below: <br /> Tolerance Limit Avera a Groundwater Elevation <br />Welt Lower U er Irri atin Season Non-irri atin <br />DS03-MWO1 4894.56 4$98.45 4897.00 4894.80 <br />DS03-MW02 4888.45 4905.16 4903.08 4894.92 <br />DS03-MW03 4901.78 4905.69 4904.28 4901.78 <br />DS03-MW04 4900.12 4904.04 4902.00 4900.70 <br />DS03-MWOS 4903.65 4907.11 4904.84 4903.69 <br />DS03-MW06 4899.62 4900.95 4900.34 4900.22 <br />DS03-MW07 4902.08 4906.06 4904,04 4903.45 <br />DS03-MW08 4903.57 4904.96 4904.60 4904.06 <br />DS03-MW09 4906.51 4908.81 4908.95 4908.17 <br />MF03-MWOi 4902.92 4907.19 4905.31 4903.17 <br />MF03-MW02 4902.80 4904.77 4904.09 4903.40 <br />MY03-MWO1 4910.12 4914.32 4913.10 4910.60 <br />CH03-MWOl 4910.56 4912.60 4911.71 4911.00 <br />CH03-MW02 4908.07 4909.07 4908.66 4908.17 <br />LAFARGE NORTH AMERICA INC. -Lafarge ConstruCion Materials <br />70170 Church Ranch Way, Sufte 200, Westminster Colorado 80221 <br />Telephone: (303) 657-4000 Facsimile: (303) 657-0037 <br />