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(or sooner if possible)of any issues identified in the inspection report that require corrective actions or <br /> modification to the existing approved TSF plans. <br /> Response: Climax appreciates the Division's willingness to combine the annual reporting. Climax will <br /> commit to notifying DRMS within 30 days of the inspection(or sooner if possible)of any issues <br /> identified in the inspection report that require corrective actions or modification to the existing approved <br /> TSF plan. Please note that issues triggering such notification would consist of those that,unless <br /> immediately corrected,could lead to failure of the structure. Issues addressed under typical maintenance <br /> circumstances would not be reported within 30 days. Although not mentioned in the comment, Climax <br /> also acknowledges the requirements of DRMS Rule 8.1 regarding emergency notification. <br /> PSHAIFault Inventory <br /> In general, DRMS and DSB agree that the PSHA is very well done; however, there are a few items that <br /> will require some clarification. The first appears to be a "typo"in the fourth line of the second <br /> paragraph of page 4 which now reads "...resulted in a minimum non-circular FS of 2.8...."Based on the <br /> included figure and table this appears to be a circular failure surface. <br /> The second item requiring clarification is the inventory of faults utilized for the PSHA. The PSHA calls <br /> out the nearby Mosquito Fault, in addition to the Gore Range Frontal and Sawatch Faults as the largest <br /> contributors to the hazard to the S Dam TSF; however no mention is made of the Tenmile, Kokomo, or <br /> Mayflower faults which are shown by the USGS geologic map to directly underlie(or very nearly)the <br /> TSF structures. Were these other named faults, as well the number of unnamed faults shown in the area of <br /> the TSF, evaluated for their contributions to the overall seismic hazard as part of the PSHA? <br /> Response: The typo in the technical memo has been addressed and the corrected memo will be <br /> transmitted to DRMS electronically. The Kokomo,Mayflower Gulch and Tenmile Creek faults are all <br /> relatively short bedrock faults that were included by Widmann et al.(2004)on their geologic map of the <br /> 7.5' Copper Mountain Quadrangle. All of these faults were mapped as buried beneath any Quaternary <br /> sediments along their length,they show no geomorphic expression,and were not included in the <br /> Quaternary fault compilations of Kirkham and Rogers(1981),Widmann et al. (1998),or in the USGS <br /> Quaternary Fault and Fold Database of the U.S. (http://earthquake.usgs.gov/hazards/gfaults/)because they <br /> show no evidence of Quaternary activity. They have lengths of 5 to 7 km,but much of that is inferred. <br /> Additionally, Widmann et al. (2004)did not include them as active fault sources in their text(see their <br /> Seismicity section). Although URS considered these faults,they also did not include them in the PSHA <br /> model as separate sources because they were judged to be older structures that have a very low <br /> probability of being active and seismogenic(<O.1)because of their apparent age and short length. <br /> Climax appreciates the Division's consideration of these responses to the second adequacy review of TR- <br /> 23. Please contact me should you have any questions on the responses. <br /> Sincerely, <br /> Raymond Lazuk <br /> Environmental Manager <br /> Attachment: OMM Revision 1.1 Replacement Pages 5-5, 6-2, 8-1 <br /> 2 <br />