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Permit Revision No. 7 -Responses March 7, 1997 Page 3 (] 905-1995), average precipitation amounts were identified for each month during the yeaz (Table 1). Also from the 90 yeaz record, precipitation amounts were established from the period immediately preceding the growing season (October through May). This period was based on discussions with Mr. Tony Waldron of the Division, as the storage of water in the soil preceding the growing seasons will have an immediate and direct effect on plant growth, particularly in herbaceous cool-season graminoid communities. From the 90 year record, an average precipitation sum for "pre-growing season precipitation" was established. Additionally, records from prior years (1996, 1995, 1994, and 1993) were established which provided sums of the "re-growing season precipitation" (Tables 2-5). From these records, and the 90 yeaz record, it was proposed that the wet yeaz (high precipitation), average year (mean precipitation), and dry year (low precipitation) be determined by a ten percent deviation from the 90 yeaz mean. The wet year would be defined by a "pre-growing season precipitation" accumulation of 12.62 inches or greater precipitation. The dry year would be defined as a year where the "pre-growing season precipitation" accumulation was 10.32 inches of precipitation or less. 11. The proposal for establishment of a historic record for evaluation of revegetation success is contained within PR07. The method by which precipitation data will be reviewed each year is contained in the 1996 summary report titled, "Historic Record Study Area, Baseline Chazacterization (1996), Precipitation, Soils, Vegetation, West Elk Mine, Somerset, Colorado", prepared by Savage and Savage. An excerpt from the report is included. A summary report will be completed after each year that vegetation sampling has occurred in the Historic Record Study Area. This summary report, when finalized, will be submitted to CDMG for review. Upon completion of the final vegetation sampling (third year), a revision application will be submitted which includes a final report that details the results of all historic record vegetation sampling and establishes revegetation success standards based on the values of the historic record. This commitment has been added to page 2.05-69. 12. MCC agrees that the revegetation success standard for diversity should be based on the species composition of the Historic Record Study Area. To this end, each yeaz's summary report will include information on species composition of the Historic Record Study Area. The final report will include a proposed revegetation success standard for species composition. The permit (Table 41) has been updated to reflect that the species diversity success standard will be established by the Historic Records Study Area. 13. Sampling of the Historic Record Study Area will include sampling of woody plant density. As this vegetation community is the prototype for the successful revegetation community, it is anticipated that the woody plant density information collected during the historic record sampling period will be utilized to propose a woody plant density success standard in the final report. The permit (Table 41) has been updated to reflect that the species diversity success standard will be established by the Historic Records Study Area.