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public switched telecommunications network and/or with the wireless communications network <br />operated by such tower tenants, all phone lines, generators and secondary power supplies, all cells <br />on wheels, shelters and concrete pads. <br />3. The proposed Mining Activities will undoubtedly produce a significant amount of dust in and around the TowerCo <br />communications facility and we are concerned about the potential for equipment damage and/or interference at <br />the site. We want to ensure that Lafarge has an adequate dust abatement plan in place prior to undertaking any <br />Mining Activities so that we can ensure that TowerCo's equipment and the equipment belonging to our tower <br />tenants is not disturbed or blocked and shall remain free of dust at all times during the Mining Activities. They <br />have not spoken to our concerns, so we are still unclear as to how Lafarge intends to address the dust issues in and <br />around our communications site. <br />4. In order to ensure the continued structural integrity of the tower and foundation, as well as the safety of our tower <br />tenants and their equipment, we will require that a TowerCo approved engineering firm complete the following <br />tests and inspections before, during and after the mining activities, as specified below: <br />o Visual tower inspection to establish the current condition of the tower prior to commencing any <br />Mining Activities <br />o Non-destructive foundation testing (pulse echo) to establish the current condition of the tower <br />foundation prior to commencing any Mining Activities <br />o Structural analyses of tower and foundation based on seismic response due to blasting, if any. In <br />this regard, please provide complete data with repsect to any proposed blasting, to include the <br />proximity of the blasting to our communications facility and the charge loads. We would require <br />that this analyses be completed prior to commencing any Mining Activities. <br />o Periodic tower and foundation inspections following any Mining Activities to evaluate the effects <br />of the Mining Activites on our communications facility. <br />o A baseline geotechnical study to establish the current condition of the soil within and surrounding <br />the tower compound prior to commencing any Mining Activities. TowerCo further reserves the <br />right to perform additional, periodic geotechnical studies, as TowerCo deems necessary in its sole <br />opinion, throughout the duration and following the completion of the Mining Activies to evalute <br />the impact on the soil conditions within and surrounding the tower compound. <br />NOTE: TowerCo also fully expects Lafarge to cover any and all legal and/or engineering costs that TowerCo incurs <br />in satisfying these requirements. <br />We did receive a response from Lafarge in February (also attached), which included an updated Stability Analysis Report <br />and cover letter from Tetra Tech dated February 7, 2011 ("TT Letter"), which purports to address the concerns raised by <br />TowerCo in our response letter, but the response was wholly inadequate and did not address go% of our concerns. To be <br />more specific, Paragraph 3 of the TT Letter states that original report was prepared to "satisfy Division of Reclamation, <br />Mining and Safety (DRMS) standards which require us to use conservative parameters"; however, Paragraph 4 of the TT <br />Letter states "we adjusted the stability analysis model to use more realistic parameters". I'm unclear as to whether we <br />should now assume that the new Stability Analysis Report is out of compliance with DRMS standards? <br />Paragraph 4 of the TT Letter also states "the bedrock strength was adjusted to correspond to a more realistic strength"; <br />however, no basis is provided to substantiate these parameters. If these new parameters were the result of a soils/rock <br />exploration report, we should be provided with a copy. If not, we should be informed as to how these adjustments were <br />justified. <br />Paragraph 4 further states "the mining cell depth was adjusted to its actual proposed depth of 19'near the TowerCo tower, <br />and a more realistic slope of .75:1 (Horizontal:Vertical) at the mine's high wall was used". TowerCo will require a site plan <br />and topographic drawing(s) showing the final mine depth and slope similar for illustration and our consideration. <br />Paragraph 5 states: "the factor of safety information [TowerCo] reference is unrelated to the Stability Analysis report that <br />we prepared". Again, as the site owner, it is not in TowerCo's interest to accept limits lower than minimum code <br />requirements for the mine wall compared with tower foundation. If the slope fails, the integrity of the tower foundation <br />may be compromised. It is TowerCo's position to enforce at least a 2.0 safety factor, and we reserve the right to increase <br />that safety factor as we deem necessary. <br />