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10-year, 24-hour storm event. Pond design and criteria can be found on <br />pages 72 through 80 of the permit application. <br />D. Acid-Forming and Toxic Spoil <br />No acid- or toxic-forming materials have been identified as occurring within the <br />mine or loadout areas as a result of a chemical analysis of soils, coal, roof and <br />floor materials, or the coal refuse. For more information on the results of these <br />tests, refer to Section 2.06 of the permit application. <br />E. Impoundments <br />Three sediment ponds currently exist at the Twin Pines No. 2 Mine site and <br />sales site (see C above). No other impoundments are present at the mine or <br />sales site. <br />F. Surface and Groundwater Monitoring <br />Despite cessation of mining, the applicant will continue to conduct hydrologic <br />monitoring in a manner approved by the Division and according to the terms as <br />outlined in Stipulation 18, as follows: <br />Stipulation No. 18 <br />THE PERMITTEE WILL SUBMIT TO THE DIVISION SEMI-ANNUAL MONITORING <br />REPORTS FOR BOTH THE TWIN PINES MONITORING WELL AND FOR THE <br />CALDHtOLA MINE WELL. THE MONITORING REPORTS MUST INCLUDE <br />QUARTERLY WATER LEVEL, PH AND ELECTRO-CONDUCTIVITY MEASUREMENTS. <br />THE QUALITY OF THE WATER IN WELL NO. TPW-1 WILL BE MONITORED SEMI- <br />ANNUALLY FOR THE FOLLOWING PARAMETERS: <br />PH ALUMINUM <br />CONDUCTIVITY SODIUM <br />TDS SULFATE <br />TOTAL HARDNESS ARSENIC <br />SAR BORON <br />BICARBONATE CADMIUM <br />CALCIUM COPPER <br />CARBONATE IRON <br />CHLORIDE LEAD <br />MAGNESIUM MANGANESE <br />NITRATE MERCURY <br />POTASSIUM SELENIUM <br />~__ <br />THIS FULL SUITE SAMPLING OF WELL NO. TPW-1 WILL BE CONDUCTED IN <br />APRIL AND OCTOBER OF EACH YEAR, AND THE REQUIItED SEMI-ANNUAL <br />MONITORING REPORTS WILL BE SUBMITTED BY TUNE 1 AND DECEMBER 1 OF <br />EACH YEAR. <br />Division review of hydrologic data submitted since 1984 indicates that the two <br />wells referenced in Stipulation No. 18 have not shown any impact from mining. <br />Mine inflow has been relatively constant over the period between 1987 and <br />23 <br />