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4.3 APPENDIX C operations. Water quality shall be sampled quarterly for Held meazurements and major and minor components starting 6 months prior to mining operations. Field measurements shall be monitored quarterly with major and components sampled annually during mining operations. Should quantity or quality of any springs or seeps deviate significantly from baseline, sampling intensity and frequencies may increase az directed by the authorized officer. The number and location of surface water monitoring stations and spring sites shall be submitted by the applicant to the authorized officer for approval. The designated operator/lessee shall submit a quarterly hydrologic monitoring report to the au0torized officer. Any significant changes to hydrologic system shall be reported within 10 working days after being detected. Discharge of water will not be allowed without prior written approval from the authorized officer of BLM. A detailed subsidence monitoring system will be submitted by the designated operator/lessee to detect and determine: 1. Extent of caving 2. Impact oo Mahogany Zone due to caving and/or pillar failure 3. Any surface subsidence 4. Actual cavity configuration This design will. be submitted to the authorized officer for approval. The authorized officer wi0 approve or approve with modifications or disapprove the design within 30 days of receipt. The subsidence monitoring system will be in operation prior to sodium production and will continue for at least 3 years following project cessation, or longer if conditions warrant, az determined by the authorized officer. 4.3.6 Submittals The following information shall be submitted to the authorized officer within 30 days after such data is obtained: 1. One wpy of all hydrologic data obtained from drilling and monitoring 2. Copies of all downhole logs 3. Fluid injection and production volumes and correspond- ing pressures 4. The daily 5'h-inch by 8 ye-inch annular pressure readings 5. Copies of the mud check sheets 6. Weekly monitoring data of fluid levels in the l3 i5 -inch by 8 3'a-inch annulus The Cement Evaluation Tool (CET) log or equivalent shall be submitted to the authorized officer within 10 days after logging. Production from a cavity shall be stopped if production from the cavity meets the calculated production, hazed on the assumed cavity configuration. Specific details and specifications for epoxy spray coatings or other remedial measures of minor casing leaks will be provided to the authorized officer for approval before initiating well conswction. The authorized officer will be notified of all spills, leaks and pressure losses within 24 hours of the occurrence during the week, or lust thing Monday rooming if the occurrence is on a weekend. 4.3.7 Reclamation Interim reclamation meazures may be necessary before project cessation, az determined by the authorized officer. In addition, erosion control measures may be necessary, az directed by the authorized officer. Topsoil will be stripped to appropriate depths on all areas that will be disturbed by the proposed action and wi0 be stockpiled for future restoration, az directed by the authorized officer. Topsoil stockpiles will be fenced with single strand wire and will be appropriately shaped, i.e., slopes 4:1 or less, to minimize erosion before seeding and to maximize vegetation establishment after seeding. Stockpiles will be adequately designated with signs. Topsoil shall not be used az pipeline padding or mixed with spoils. Whenever possible, salvaged topsoil will be applied directly to recontotued areas, reducing to the greatest extent possible, long-term topsoil stockpiling. Topsoil stockpiles and exterior cut and fill slopes of evaporation ponds will be seeded, az soon az possible, with We following interim reclamation seed mix to enhance viability of stockpiled topsoil and to minimize potential erosion problems with both stockpiles and evaporation pond: 4.3-4