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Seneca II W <br />AHR 2017 <br />Page 3 <br /> <br /> <br /> <br /> <br /> <br /> <br />Requirement Requirement citation Comment <br />8. Basic Standards for <br />Surface Water <br />CWQCC regulations <br />31.1.11 <br />Only sites WSD5, WSSF3, WSH7 and WSHFF1 <br />downstream of the Seneca IIW site have their waters <br />used for irrigation. <br /> <br />The manganese standard (0.2 mg/l), for agricultural <br />use, was exceeded seven times at six different sites, <br />including Springs WSHF1, WSPG 46, WSPG50, <br />WSSPG3, WSSPG4 and Pond 06 during the 2017 <br />water year. <br /> <br />Based on CWQCC reg. 31, the standard of 0.2 mg/l, <br />applies to plants grown in acidic soils (<6.0 pH). In <br />alkaline soils, as found throughout the Yoast and <br />Seneca II W region, the EPA standard would be 10 <br />mg/l. The maximum manganese value observed at any <br />surface site was 1.06 at site mg/l at site WSPG50. Pre <br />mining manganese baseline values exceeded the 0.2 <br />mg/l standard as well. <br /> <br /> <br /> <br />9. Instream Numeric <br />Standards <br />CWQCC regulation 33.0 16 monitoring sites exist within the Sage Creek, and <br />Hubberson Gulch/Dry Creek basins: WSD5, WSH7, <br />WSH9, WSPG7, WSPG23, WSPG46, WSPG47, <br />WSPG50, NPDES 5, NPDES 16, NPDES 17 are within <br />Hubberson Gulch/Dry Creek Basing and, NPDES 6, <br />WSSF3, YSSF3, NPDES 9, NPDES 15 are located <br />within Sage Creek basin. In addition, Spoil Springs 1-5 <br />are found within the Dry Creek Basin. <br /> <br />The receiving stream standard for Sage Creek is on <br />Segment 13e of the Yampa River basin and, on Segment <br />13d of the Yampa River basin for Hubberson Gulch/ Dry <br />Creek basin. <br /> <br />The stream standards for Sage Creek and Dry Creek <br />are based on aquatic life standards. Table 13 of the <br />2017 AHR provides a comparison of the standards to <br />water quality collected from NPDES points and stream <br />sites in the Hubberson Gulch/ Dry Creek Basin. Table <br />15 of the 2017 AHR provides a comparison of the <br />standards to water quality collected from NPDES <br />points and stream sites in the Sage Creek Basin. <br /> <br />The ammonia nitrogen standard (0.05) was exceeded <br />twice at two sites. <br /> <br />The total recoverable iron standard has seasonal limits <br />(1.11 mg/l from May – Feb. and 3.04 mg/l during <br />March and April) and was exceeded five times at four <br />sites as per Table 12 for Dry Creek in the AHR. <br /> <br /> <br /> <br /> <br /> <br />