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Mr. Steve S. Shuey March 31, 1992 Page 3 spatial and temporal variability common to the measurement of precipitation, flows, evaporation, arrl groundwater levels. While continued data collection may eventually result in an acceptable generalized or average water budget for the drainage basin, the degree of refinement required to distinguish between natural and mine related potential water losses for specific surface water resources seems unrealistic. Zn the alternative, CnVCC advocates the continued pre-mining aryl post-mining monitoring of site specific surface water and groundwater resources within those areas potentially influenced by mining and related subsidence phenomena. Ct~VCC recognizes this suggested change in permitted monitoring practice must be addressed as a technical revision and will pursue the el~m;nation of evaporation pan monitoring formally through the technical revision application process. Itan 2: Please submit a letter responding to the concerns raised by Kent Gorham (MIRD) in his A.H.R. review letter dated October 29, 1991. Response 2: A response letter to Mr. Gorham has been submitted. Item 3: Please provide a Dopy of the West Roatcap Creek water quantity monitoring plan that was submitted by GWI to satisfy Stipulation No. 5 of the 1985 Findings (currently Stipulation No. 30). Please indicate whether this plan was implerented and, if not, provide an explanation. Response 3: A copy of the West Roatcap Creek water quantity monitoring plan is included in this submittal. The plan was submitted in response to Stipulation No. 6 of the 1985 findings (currently Stipulation No. 31). The plan was implemented as detailed with the exception of the station designation remaining SW-9 as opposed to being changed to SW-13. Three years of flow data from the new diversion have been collected. No changes in dater quantity are evident to date. Item 9: Please submit a technical revision which provides a concise table of all groundwater, surface water, mine inflow, and subsidence monitoring stations. Response 4: In accordance with this item and COVCC's desire to reduce the extent of the hydrology monitoring program, a technical revision application is being assembled and will be submitted under separate cover. ~VCC respectfully requests that an extension be granted for responding to this item. COVCC anticipates submitting this TR by 4/30/92. Item 5: Please submit a minor revision to exclude the references made to the rock slope tunnels that were to be driven under the fire area of the Orchard Valley portals. Response 5: While it is unlikely the planned development of the rock slope tunnels will be pursued, ~VCC would prefer to postpone removal of this