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Dry Creek <br />SP projects impacts from all spoil springs will increase TDS in Dry Creek from <br />1,048 mg/1 to 2,451 mg/l. The TDS increase extends from Hubberson Gulch to the <br />Dry Creek reach monitored by Station WSD5 (upstream of the fields irrigated from <br />Temple Reservoir #1). At this point, the baseline TDS level in Dry Creek begins to <br />increase downstream. At a downstream location in Dry Creek, the TDS <br />concentrations are elevated enough (TDS = 3,567 mg/1) that the cumulative spoil <br />discharge influences from both mining areas (Seneca II -W and Seneca II -W South <br />Extension) will be minimal. The source of the salt loading to Dry Creek is <br />principally seepage from dry land farming that extends from the hillslopes at the <br />base of the mountains to Hayden. Dry Creek water is mixed with water from the <br />J.C. Temple Reservoir #1 for irrigation in fields below this reservoir. The Division <br />finds that there will be no material damage to water in Dry Creek since the <br />background TDS levels are higher than the projected TDS levels from Hubberson <br />Gulch. <br />1. The applicant will conduct monitoring of ground water in a manner approved <br />by the Division. The ground water monitoring plan is as found in Tab 15 <br />Appendix 15-3 (4.05.13(1)): <br />2. The applicant will conduct monitoring of surface water in a manner approved <br />by the Division. The monitoring plan was submitted under 2.05.6(3)(b)(iv) <br />and in described in Tab 15 Appendix 15-3 (4.05.13(2)): <br />H. Discharge of Water into an Underground Mine <br />There will be no discharge of water into an underground mine from this operation. <br />IV. Topsoil <br />Soil resource information is provided in Tab 9, Volume 5 of the permit application. <br />Information on topsoil handling, maintenance and testing is contained in Tab 21, Volume <br />13. The PR -1 submittal extensively reorganized the soils sections of the application and <br />updated the soil baseline information to reflect a 1990 survey of portions of the north <br />mine area which had not previously been surveyed. Baseline data had been collected for <br />the South Extension Area covered in PR -2, and in 1997 SP conducted a topsoil depth <br />verification survey to confirm the topsoil resource information collected previously. This <br />information is also included in Tab 9. The referenced permit sections were further <br />amended to address the expanded disturbance area associated with PR -3. In PR -5, the <br />Soil Survey Map (Exhibit 9-3) was updated to reflect disturbance boundary modifications <br />in the southern Wolf Creek/Sage Creek block in the south extension area. Cessation of <br />mining operations earlier than originally anticipated resulted in a reduced area of <br />disturbance in the deep "70D" soil map unit. Associated updates were made to the Soil <br />Replacement Map (Exhibit 21-1) and topsoil balance narrative and tables in Tab 21. <br />W <br />