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• SENECA II <br />RESPONSE TO COMMENTS OF JUNE 15, 1988 <br />TECHNICAL REVISION N0. 14 <br />Tab 7-Hvdrolo <br />1. Page 7-265, dated October 1, 1986, specified "Mining will disturb <br />approximately 6.6 percent of this drainage area." Revised page <br />7-265, dated May 16, 1988, states "Mining was initially projected <br />to disturbed approximately 9.0 percent of this drainage area." <br />Please clarify this apparent discrepancy and update application <br />pages, as necessary. <br />Response: <br />No additional updating of text pages should be necessary to respond to <br />this comment. In redigitizing the disturbance areas to determine the <br />increase in disturbance area represented by the East Wadge Extension <br />Area, an error was discovered in the calculation of the original <br />disturbance area. Digitized measurements indicate that approximately <br />335.76 acres were to be originally disturbed in the Bond Creek drainage. <br />This represents 9 percent of the 5.8 square mile Bond Creek drainage <br />area. Disturbance associated with the East Wadge Extension Area was <br />measured to encompass approximately 35.3 additional acres or 1 percent <br />of the total Bond Creek drainage area. This correction was made in the <br />• text as part of Technical Revision No. 14. <br />~ 2. Table 7-80 on revised page 7-277, dated May 16, 1988, has a column <br />entitled "Most Recent Concentration (mg(1)." Buried in the text is <br />the actual date of this measurement. To avoid confusion and to <br />provide readily accessible information, the actual date of the <br />measurement should be specified on this table. <br />Response: <br />Table 7-80 has been revised to reflect the date of the most recent <br />parameter concentrations. Please replace the old copies of page 7-277 <br />with the attached. <br />3. A review of the maps reveal that same of the disturbance being <br />proposed by Peabody will occur in the drainage basin where the <br />future Pond 009 is proposed to be installed. During the interim, <br />however, Exhibit 7-7 reveals a ditch is proposed to be installed at <br />the toe of the proposed new deadhead route to force drainage into <br />the Pond 008 drainage basin. The Division is concerned that <br />drainage remain on-site and is treated prior to release from the <br />site. Therefore, please provide the actual calculations developed <br />and assumptions used to size this ditch for the maximum storm event <br />and verify that this additional drainage can be handled by Pond <br />008. Also, please delineate on this exhibit the drainage area <br />• contributing to this diversion ditch. <br />1 <br />