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Upstream Site HGSD1 displays an increasing TDS trend; however, the TDS <br />peak occurred in 1995. Likewise, downstream Site HGSD3 indicates an <br />increasing TDS trend; however, its peak TDS occurred in 2002. <br />Ground Water <br />Ground water quality reports for this year are presented in Appendix B. <br />Data provided includes a water quality report for this year, a water <br />level report, sampling remarks and a listing of a regression plot of <br />historic TDS data. <br />Well HGDAL3 is downgradient of the Loadout. It was drilled in 1993. It <br />displays an increasing TDS trend; however, the peak TDS value occurred <br />in 1997. <br />Well HGDAL4 is upgradient of the Loadout. It was drilled in 2005. It <br />displays a decreasing TDS trend, with the peak TDS value occurred in <br />2007. <br />This year's ground water quality was compared against CDPHE ground water <br />agricultural use standards (CDPHE, Reg. 41, 2008). Results of those <br />comparisons are presented in Table 4. <br />Both wells exceeded the manganese standard (0.2 mg/1) in both May and <br />September. It should be noted that, while the CDPHE uses a manganese <br />standard of 0.2 mg/1, the EPA states that this standard is used to <br />protect crops grown in soils with a pH value lower than 6.0. In January <br />2008, CDPHE revised their ground water agricultural standard to reflect <br />this pH qualifier. In soils with a higher pH (as are found in the HGT <br />region), a more appropriate standard would be 10 mg/l (EPA. 1976. <br />"Quality Criteria for Water"). This year, neither of the Loadout wells <br />displayed a manganese value higher than 4.04 mg/1. <br />Downgradient Well HGDAL3 exceed the boron standard, 750 ug/1, with a <br />value of 850 ug/l in September. According to the CDPHE, the 750 ug/l <br />standard is set for sensitive crops (CDOH, Reg. 41, 2008), and that the <br />4