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APPENDIX 15-1 (CONT.) <br />• <br />• <br /> MONTHLY QUARTERLY SEMI- <br />ANNUALLY ANNUALLY <br />NEW HORIZON 2 MINE February, May, <br />August, Nov February ,August August <br />GW-N16P1 (Underburden) Field(9) Lab(10) <br />GW-N17P1 (Dakota Coal) Field(9) Lab(10) <br />GW-N18P1 (Overburden) Field(9) Lab(10) <br />GW-N36 (Underburden) Field(9) Lab(10) <br />GW-N37 (Dakota Coal) Field(9) Lab(10) <br />GW-N38 (Overburden) Field(9) Lab(10) <br />GW-N39 (Alluvium) Field(6) Lab(10) <br />GW-N40 (Alluvium) Field(6) Lab(10) <br />GW-N41 (Overburden) Field(6) Lab(8) <br />GW-N42 (Coal) Field(6) Lab(8) <br />GW-N43 (Underburden) Field(6) Lab(8) <br />GW-N44 (Overburden) Field(6) Lab(8) <br />GW-N45 (Coal) Field(6) Lab(8) <br />GW-N46 (Underburden) Field(6) Lab(8) <br />SW-N102 (NPDES 007) Field(3) Lab(4) <br />SW-N104 (West Lateral Ditch) Field(1) Lab(s) <br />SW-N105 (West Lateral Ditch) Field(1) Lab(5) <br />SW-N108 (Calamity Draw) Field(1) Lab(s) <br />SW-N109 (Calamity Draw) Field(1) Lab(5) <br />(1) Measure monthly water conductivity, PH, temperature, flow/depth for surface water monitoring stations <br />(SWs) <br />(2) Measure monthly for conductivity, PH, temperature, oil/grease, settleable solids, total suspended solids, <br />total dissolved solids, and iron for all discharging water from ponds for Outfalls 001 through 006. <br />(3) Measure weekly for conductivity, PH, temperature, oil/grease, settleable solids, and Flow for all <br />discharging water from Outfalls 001 and 007. Test for total suspended solids, total dissolved solids, and <br />iron once a month for Outfall 001 and Outtall 007. <br />(4) Measure water conductivity, PH, temperature, oil/grease, settleable solids, total suspended solids, total <br />dissolved solids, and iron. Full suite laboratory analysis (February, May, August, and November on <br />quarterly schedule), if pond(s) are discharging for Outfalls 001 through 007 <br />(5) Measure water conductivity, PH, temperature, oil/grease, and flow/depth Have full suite laboratory <br />analysis February and August for Semi-Annual schedule and August for Annual schedule) for listed <br />• groundwater monitoring wells and surface monitoring stations. <br />(6) Measure monthly water depth for groundwater monitoring wells (GW's). <br />(7) Measure annually water depth for groundwater: revert back to monthly if water is found, <br />(R.EVISED 12-17-581 <br />