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We've been attempting to examine locations of XTO wells and NECC's mining plans. There <br />are some discrepancies between well & pipeline locations, missing wells, and compressor <br />stations (which NECC probably <br />doesn't have yet). I have listed the missing wells and the largest <br />discrepancies in well locations below. I have also included the well location file <br />comparisons and pdf's of pipeline /wells superimposed on the NECC image data as well as the <br />compressor stations superimposed on the NECC pdf file. As for the differences in well <br />locations, some of the inconsistency might have to do with using pictures rather than <br />electronic data, however, this will not explain all the differences. There is no consistent <br />offset and the average offset is 45' with 8 wells greater than 60'. The NECC files <br />themselves appear to have some inconsistency with average and maximum offset differences of <br />14' and 23' respectively. <br />I've just learned today that we did recieve an electronic DFX file from NECC /Agapito. <br />This should greatly help the reconciliation process. <br />Right now we're investigating if the import will result in significant error as the export <br />projection is different from ours( State Plane Zone <br />0503 (Colorado South) NAD83 vs North American Datum 1927 (NAD27)). We'd like to send NECC <br />our pipeline, well, and compressor location data electronically. Please tell us what file <br />type and projection we should use for those files. <br />Many thanks for your help. Please contact me with any questions you <br />might have. <br />Follow -ups <br />XTO has no deviation surveys in wells within the proposed mine expansion area, so no <br />definitive bottom hole locations are available to help define pillar sizes around wellbores <br />XTO wells not on NECC record file <br />GE 30 -08, AC 30 -02, GE 30 -02, AC 01 -04 <br />NECC well that XTO has no record of <br />AC 02 -01 <br />Largest Discrepancy Wells <br />GE 29 -04 84' <br />GE 19 -15 82' <br />AC 31 -10 78 <br />NE 24 -16 73' <br />[attachment "MineLocationComparisons.xls" deleted by George Staus /FTW /CTOC] [attachment "XTO <br />Well Locations & Pipelines.pdf" deleted by George Staus /FTW /CTOC] [attachment "XTO Compressor <br />Stations & Pipelines.pdf" <br />deleted by George Staus /FTW /CTOC] <br />George Staus <br />Reservoir Engineering / San Juan Basin <br />XTO ENERGY a subsidiary of ExxonMobil <br />810 Houston St. (WTW -1506) <br />Fort Worth, TX 76102 <br />Phone: (817) 885 -1178 <br />George_Staus @xtoenergy.com <br />3 <br />