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On Table 4, the shrub density is calculated as "11,542.4 stems per acre". As recorded <br />on the raw data sheets, a total of 57 shrubs were found along 20 belt transects, each <br />belt transect covering an area of 50 mZ. This results in .057 shrubs per meter <br />squared, and assuming 4049 square meters per acre, results in 230 shrubs per acre. <br />While there is no approved shrub standard at this mine, the DMG collected shrub <br />information and feels it is important to accurately report observed shrub density at the <br />site. <br />Since the 2002 report will not be used for bond release purposes, I have not included <br />corrected pages for the report. Corrections to the 2002 report stand as iterated above. <br />Please refer to the report titled "2003 Vegetation Sampling, Release of Liability, Rimrock <br />Strip Mine, Trinidad Colorado" dated March 18, 2004. The following errors in the report or <br />explanations to its content are noted below. <br />On the first page of the Interoffice Memo attached to the report, the live herbaceous <br />biomass is reported as 72.9 g/1/2 mZ, or 145.8 g/m2 which coverts to 1365 Ibs/acre. <br />A quadrat measuring 50 centimeters square was used for each individual production <br />clipping, resulting in a mean of 72.9 g/1/4 mZ, or 291.6 g/mZ which converts to 2602 <br />Ibs/acre. Report pages and tables have been corrected <br />On page 2 of the same memo, the null hypothesis was tested to determine success <br />with field bindweed removed from the data. This t-test is complicated and the <br />calculation was omitted from the memo. The calculation is now included in the <br />replacement cover letter to the report with detailed explanation. <br />Shrub data was again collected in 2003 (although not required for bond release) and <br />reported on Table 2 of the report. Shrub density was calculated as "1.36 stems per <br />acre". 12 shrubs were found along 15 belt transects each sampling a 328 ftZ area <br />resulting in a total area of 4920 ftZ. 12 shrubs in 4920 ftZ results in a calculated shrub <br />density of 106 stems per acre <br />Please replace the March 2004 report text and cover letter of April 2, 2004 with the enclosed, <br />replacement cover letter and report. Please retain only the Raw Data Sheets for cover and <br />stem density and the map (Exhibit KK-1) from the previous report. Our apologies for the <br />errors and confusion. If you have any questions about the data or the process in general, <br />please contact me. <br />Since ly, <br />ent A. Gorham <br />Environmental Protection Specialist II <br />