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r~ <br />J <br />Dowe Flats <br />1.0 SUMMARY OF SIGNIFICANT FINDINGS <br />The results oC the third quarter water quality analyses for the Dowe Flats project show no <br />significant changes from the first and second quarter results. No elevated concentrations of <br />contaminants were detected with the exception of trace levels of certain volatile organics in two <br />surface samples and one groundwater sample. These compounds were detected at concentrations <br />below the EPA practical quantitation limit (PQL), and may or may not be present in the water <br />samples. <br />Inorganic analyses, including metals, also are similar to the results of the first and second quarter <br />analyses. Concentrations of total suspended solids in the third quarter groundwater analyses are <br />lower than those in the previous two sampling events. Surface and groundwater quality is <br />interpreted to be representative of normal background conditions. Major ion balance calculations <br />indicate that the third quarter water analyses are within an acceptable error range. <br />2.0 INTRODUCTION <br />• The first quarter sampling event was performed by Western Technologies Inc. (WT) on Junc 8, <br />1990 and on August 2, 1990. The second quarter sampling event was performed on September <br />18 and 20, 1990. This report is for the third quarter sampling event which took place on <br />December 27, 1990. Evergreen Analytical, Inc., of Wheat Ridge, Colorado provided analytical <br />laboratory services for the parameters. <br />• <br />Water samples were collected from four monitoring wells and two surface water locations. In <br />addition, a trip blank labeled DFSW-4 was submitted to the lab as a QA/QC measure. A <br />laboratory blank from the laboratory also was provided during the sampling. Plate 1 contains a <br />map of the monitoring locations. Table 1 summarizes all water quality data collected to date. <br />Copies of the chain of custody and laboratory results Cor the third quarter sampling event are <br />provided in the Appendix. <br />Pmjetl NmDa: 219-9J-042 <br />Jaooary 21, 1991 <br />Pate 1 <br />