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• Surface Water Suitability. The analytical results preaentad in Tables 7-5, 7-6, and 7-7 <br />for both the upstream (HGSD1) and downatraem surface monitoring sites (HGSD2 and HGSD3) <br />were compared against agriculture water standards developed Por the State of Colorado by <br />the Colorado Department of Public Health and Environment (CDPHE). Prior to 1993, trace <br />metals constituents were analyzed for total concentrations. Following the acquisition <br />of the Loadout by HGT, the analytical analysis for trace metal constituents was changed <br />to the total recoverable fraction to allow for direct comparison of analytical results <br />with CDPHE numeric standards. CDPHE agricultural standards era for total recoverable <br />concentrations and comparison o£ the pre-1993 analytical agriculture standards may <br />result in a biased comparison. The poet-1992 surface xater analytical suite is <br />presented in Table 13-1 under Tab 13. <br />The CDPHE agriculture standard for manganese of 0.2 mq/1 was exceeded once since 1993 at <br />the upstream site HGSD1, on two occasions at HGSD2 since 1993, and once at HGSD3 since <br />1993. The CDPHE agriculture selenium standard of 0.02 mg/1 was exceeded regularly at all <br />sites, including all seven samples collected at Bite HGSD3 between 1993 and June 1997. <br />The CDPHE surface water criteria has not bean established spaci£ically for irrigation or <br />livestock use. However, WDEQ does have specific irrigation and livestock uea standards <br />and the WDEQ standards are referenced here as use-suitability guidelines. Ae discussed <br />• in the ground water section, the WDEQ standards, while not promulgated in Colorado, era <br />widely used within the industry Por aseeeaing potential water quality impacts. TD9 and <br />sulfate concentrations at all surface water monitoring sites ware generally greater than <br />the WDEQ irrigation use standard of 2,000 mq/1 and 200 mg/1 for TD9 and sulfate, <br />respectively. However, the TDS and sulfate concentrations at surface water monitoring <br />sites HGSD1, HGSD2 and HGSD3 were generally leas than the WDEQ livestock use standards <br />o£ 5,000 and 3,000 mq/1 Por TDS and sulfate, respectively. Comparison of water quality <br />data from all surface water sites with CDPHE agriculture standards, and with the WDEQ <br />standards ae use-suitability guidelines only, indicates that Dry Creek water in the <br />vicinity of the Loadout, including water upstream of the Loadout, is not suitable for <br />irrigation usage. In addition, Dry Creek in the vicinity of the Loadout appears <br />marginally suitable for livestock watering uses. <br />NPDES Discharge Information. Two NPDES sites have bean established at the Hayden Gulch <br />Terminal loadout facility. These locations era preaentad on Exhibit 12-2. Laboratory <br />data collected from NPDES outfalla since 1988 are presented in Appendix 7-1. Review of <br />this data indicates flow was present from Outfall 001 during March, May, and Juna 1997, <br />• <br />RN- of <br />30 Revised 2/98 <br />