Data Collection During Drilling

The fingerprint diagram shown in Fig. 7.1 depicts gradual salinization with depth at the Amiaz 1 well, west of the Dead Sea (Mazor et al., 1969). Fresh water was encountered at a depth of 32 m, whereas saline water of the local Tverya-Noit group was found at a depth of 85 m. A practical consequence of this is that some fresh water may be abstracted from a depth of 30-40 m. The example of the Amiaz 1 well can be generalized in each area several water bodies may be passed by a drill. All of them should be documented in the driller s records, all should be measured in situ, and samples should be collected for laboratory measurements. 

The study of water encountered during drilling causes technical difficulties most important is the possible interference of water introduced by the drilling procedure, difficulties in noticing natural water horizons that are passed by the drill, and the cost of stopping the drilling operation for measurements. These difficulties can be overcome in the following ways  

Marcel Dekker, Inc. 270 Madison Avenue, New York, New York 10016 

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Figure 4-307 shows the raw data collected during drilling the interval shown in Figure 4-306. 

To assess the well construction materials compatibility versus the subsurface environment and the pesticide of interest, manufacturers can provide data about the various well construction materials or samples can be acquired for laboratory analysis. Also, QC samples of each material can be collected during installation and preserved for laboratory analysis for potential sample bias, if necessary. In addition to well construction materials, the potable water used to clean drilling equipment and to prepare the grout and hydrate bentonite should also be collected for laboratory analysis (see Section 3.2.6). 

Data collected between January 2007 and March 2008 shows a seasonal climatic response in the shallow aquifer (Fig. 4a), which correlates well with the historic record. SWL in the Dilwyn aquifer varies little and T is essentially constant over the period (Fig. 4b) agreement with historic records, where they exist, is also good. Neither aquifer shows a response to significant perturbation such as the drilling of CRC-1 during February-March 2007. 

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