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• TAB 15 <br />HYDROLOGIC MONITORING PROGRAM <br />Introduction <br />Aground and surface water monitoring program has been developed to evaluate and assess the <br />existing ground and surface water system at the New Horizon 1 (NH1) and New Horizon 2 (NH2) <br />mining areas. The program is essentially a tool to predict and monitor the impacts of mining. The _ <br />goal of the monitoring program is to supply data that will be used as a reference to support <br />conclusions given in the Probable Hydrologic Consequences (PHC, Tab 17). Hydrologic information <br />is collected and analyzed using accepted scientific techniques. It is anticipated that mining <br />disturbances to the hydrologic balance will be minimal and that the potential uses of the ground and <br />surface water system will not be changed. The results and interpretation of the hydrologic data are <br />discussed in Tab 7, Hydrologic Description. <br />Surface Water Monibaing Program <br />• New Horizon 1 (NH1) Baseline Surface Water Mortibring Program (July 1986.1u1y 1987). <br />Surface vrater monitoring activities conducted since July,1986 at monitoring sites established in and <br />around WFC's proposed NH2 Mining area have been consistent v~ith the approved baseline <br />monitoring program. This program was proposed and outlined in a letter submitted to Mr. Steve <br />Renner from Peabody personnel on April 21, 1986. Approval of the baseline monitoring program <br />for the NH2 mining area was issued, with minor amendments, in a letter received by Peabody from <br />Mr. Peter O'Connor of the Colorado Mined Land ReGamation Division (CMLRD) on May 6, 1986. <br />The location of each surface water monitoring site in the NH2 area is presented on Exhibit 2.04.7-1- <br />A Table 1 r1 lists each NH2 surface water monitoring site, location, and type of flow measurement <br />perfomred at each site. During the baseline surface water monitoring program, each site was visited <br />on a monthly basis to maintain and service all the instrumentation, take flow measurements, and <br />collect water quality samples. . <br />• <br />(Revised 12-31-96) 15-1 <br />