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exceedances of any of the agricultural use surface water quality standards occurred at YSSPG2 <br />during this period. <br />Permit Requirements of the Colorado Discharge Permit System (CDPS) <br />SPL maintains four outfalls which collect runoff from the SL7, Phase III Bond Release areas; <br />Pond 010 (NPDES10), Pond 011(NPDES11), Pond 012 (NPDES12), and Pond 014 (NPDES14). <br />These outfalls are monitored under the CPDS Permit No. CO -0000221. Ponds 10, 11, 12, and 14 <br />are not included in the SL7 Phase III portion of the bond release application. Sample data were <br />collected and reviewed for all required parameters. Sample data have been reported on a <br />quarterly basis in discharge monitoring reports filed with the CDPHE and the CDRMS. These <br />DMRs indicate that no exceedances of permit limits have occurred in the past three water years. <br />Clean Water Act Effluent Limitations (40 CFR Part 434) <br />Monitoring data for the past five years indicate that the SPL has not caused exceedances of either <br />limitation identified in 40 CFR Part 434 applicable to reclamation areas on coal mines (settleable <br />solids of 0.5 ml/1 and pH of 6.0 to 9.0) at the Yoast Mine. SPL only notes settleable solids values <br />that are at or above the detection limit of 0.4 ml/l and no exceedances of that limit were noted. <br />Impacts to Alluvial Valley Floors (AVFs) <br />The Division determined that there are no potential AVFs in the Grassy Creek watershed and two <br />potential AVFs in the Sage Creek watershed. The AVFs within the Sage Creek watershed <br />include two small fields located in the upper reaches of Sage Creek near the failed Sage Creek <br />Reservoir site and approximately 86 acres of flood irrigated alfalfa hay along Sage Creek in <br />Section 30. <br />Photo 5: Pond 10 and surroundings. <br />Sage Creek Reservoir Site <br />Two fields located just upstream from the former Sage Creek Reservoir dam (Sections 13 and 18) are <br />identified in the Yoast PAP as sub irrigated native wetlands and sub irrigated grass hay fields. The <br />native wetland area is the area once covered by the Sage Creek Reservoir, which failed in 1985. This <br />Permit Number C-1994-082 Page 19 of 23 <br />