Leveling the site

The extrinsic case applies at low temperatures or large doping levels. The site fraction of cation vacancies is equal to the solute-atom site-fraction and is therefore temperature independent. In the extrinsic regime, no thermal defect formation is necessary for cation self-diffusion and the activation energy consists only of the activation energy for cation vacancy migration. 

This layer appears to be the result of leveling the site for agricultural purposes (ca. 320-220 B.C.) as described in ancient writings. 

Clearing and leveling the site often takes place at the same time as building the access road. The same types of equipment are used (bulldozers, excavators, and compaction equipment). When leveling the site, it is important to know the location of buried pipeline and cables so they are not damaged. The contractor needs to contact local utility companies to have them determine if there are any hazards. 

When leveling the site, you may encounter toxic plants and dangerous insects and animals. See the Worksite Exposures chapter for information on how to protect yourself from these hazards. 

All successful oil and gas extraction work begins with proper site preparation, such as building the access road, leveling the site, ensuring the ground is stable, and digging the necessary trenches and excavations. Remember to take critical precautions when drilling... 

Moreover, a special evaluation should be carried out so as to avoid potential small deviations in plant parameters from giving rise to severely abnormal plant behaviour ( cliff edge effects ) in relation to the specific nature of the external event scenario (e.g. in the case of a site protection dam, if as soon as the dam is overtopped vdth a small additional steady state water level, the site could be suddenly flooded to the maximum level of the flood). In this case, addi-tional engineering provisions should be implemented on safety systems at least for a safe shutdown mode, such as warning, monitoring and operating procedures. 

---