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c URS Operating Services.Inc. _ _ x <br /> ARR for Eu""�/Cli '` <br /> START.EPA Region VIII RB+Cmar <br /> li <br /> Contract No.68-W5-0031 Date: ision: 0 <br /> n: 8 <br /> Page 6 of 37 <br /> (University of Delaware(UD) 1986). The 2-year,24-hour rainfall event for this area is 1.5 <br /> inches(Dunne,Thomas and Luna B. Leopold 1978). <br /> 4.0 ANALYTICAL DATA <br /> 4.1 DATA VALIDATION AND INTERPRETATION <br /> The sample data collected during this ESI was reviewed using the HRS guidelines for analytical <br /> interpretation(Office of the Federal Register 1990). As reported in the analytical results in Tables <br /> 3 through 12, elevated concentrations of contaminants reported as significantly above upgradient <br /> contaminant values are noted by a star(*)and are determined by sample concentrations based on <br /> the following: <br /> • If the upgradient analyte concentration is greater than its Sample Quantitation Limit(SQL), <br /> and if the release sample analyte concentration is greater than its SQL,three times greater <br /> than the upgradient, and five times greater than the blank concentration. <br /> • If the upgradient analyte concentration is not greater than its SQL and if the release <br /> sample analyte concentration is greater than its SQL,greater than the upgradient SQL,and <br /> five times greater than the blank analyte concentration. <br /> All data analyzed by the CLP ULSA laboratories were validated by TechLaw, Inc. All data are <br /> acceptable for use as qualified in the data validation report. The complete data validation report, <br /> laboratory forms, and SQL calculations are located in Appendix C. <br /> 5.0 SOURCE CHARACTERIZATION <br /> The CM site is composed of numerous large mine tailings ponds and associated mine tailings. Tailings <br /> samples collected from Eagle Park Reservoir, Robinson Lake,McNulty tailings,Robinson Tailings Pond, <br /> Tenmile Tailings Pond, Mayflower Treatment Pond and the Wilfley Mine consist of various heavy metals <br /> with concentration ranges listed in Table 1. A complete detailed discussion regarding the circuit of tailings <br /> ponds and reservoirs may be found in Section 4.4,Surface Water Pathway,of the FSP for the SSI Analytical <br /> 75-51119.00 <br /> F:\START\CLIMAX\Final.ARR\CLIMAX.TXT.wpd:bas <br />