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RESOURCE <br />HYDROGEOLOGIC <br />SERVICES <br />that revised hydrologic monitoring parameters and frequency be adopted for these locations already <br />subjected to the expanded baseline monitoring protocol. <br />RHS recommends a reduction in monitoring frequency of these locations to bi-annual (twice yearly) to <br />coincide with the high and low flow periods. This will best utilize GCC resources to capture the overall <br />seasonal variability as the maximum and minimum wetting cycles. Based on hydrologic monitoring <br />data collected to date, the two ideal months to conduct future long-term bi-annual compliance <br />monitoring are April and October. <br />RHS recommends a reduction in monitored parameters subjected to analytical laboratory testing, while <br />keeping the field parameter list the same as the baseline suites. The proposed long-term compliance <br />water quality parameter lists are given as Table 5. To summarize the parameter revision for the three <br />lists: <br />GCC GW Compliance <br />• Remove Silica (Si02) — Comparison of TDS vs. sum of ions has been accomplished and this <br />parameter is no longer of interest with respect to monitoring for potential hydrologic impacts from <br />GCC or other historic mining impacts. <br />• Remove Mercury (Hg) — Four quarterly sample analyses for all wells have all shown non -detect <br />results so baseline characterization has been accomplished. <br />• Remove Total Nitrogen as Nitrate -Nitrite — This parameter is useful to interpret and distinguish <br />agricultural impacts from blasting explosive impacts to groundwater in surface coal mining <br />operations. King II is an underground mine and GCC has not used nor plans to use explosives in <br />their operations. Four quarterly sample analyses for all wells have established baseline total <br />nitrogen as nitrate -nitrite. <br />• Remove Ammonia (NH3) — This parameter was only intended for one-time collection during the <br />baseline period to establish absence. This parameter is useful to interpret and distinguish <br />agricultural impacts from blasting explosive impacts to groundwater in surface coal mining <br />operations. King II is an underground mine and GCC has not used nor plans to use explosives in <br />their operations. <br />• Remove Phosphate (PO4 as P) - This parameter was only intended for one-time collection during <br />the baseline period to establish absence. This parameter is useful to interpret and distinguish <br />possible impacts of general agriculture use versus fertilizer use for vegetation reclamation at <br />surface coal mines. King II is an underground mine and GCC has not used nor plans to use any <br />significant phosphate products. <br />GCC S&S Compliance <br />• Remove Silica (Si02) — Comparison of TDS vs. sum of ions has been accomplished and this <br />parameter is no longer of interest with respect to monitoring for potential hydrologic impacts from <br />GCC or other historic mining impacts. <br />• Remove Mercury (Hg) — Four quarterly sample analyses for Seep -1 have all shown non -detect <br />results so baseline characterization has been accomplished. <br />GCC ENERGY, LLC <br />2016 ANNUAL HYDROLOGY REPORT <br />9 <br />