Preliminary reconnaissance

Jovanovlch, A.P. Cohen, S.Z. "Monitoring Groundwater In Georgia for Ethylene Dlbromlde (EDB) - A Preliminary Reconnaissance In Seminole County, Georgia" In review, TS-769c. Hazard Evaluation Division, OPP/EPA,... 

The importance of the preliminary investigation is that it should assess the suitability of the site for the proposed works, and if it is suitable, it will form the basis upon which the site exploration is planned. The preliminary reconnaissance also allows a check to be made on any conclusions reached in the desk study. 

There are no given rules regarding the location of boreholes or drillholes, or the depth to which they should be sunk. This depends upon the geological conditions and the type of project concerned. The information provided by the desk study, the preliminary reconnaissance and from any trial trenches should provide a basis for the initial planning and layout of the borehole or drillhole programme. Holes should be located so as to detect the geological sequence and structure. Obviously, the more complex this is, the greater the number of holes needed. In some instances, it may be as well to start with a widely spaced network of holes. As information is obtained, further holes can be put down if and where necessary. 

Zare M (2003) Seismological aspects of Bam (SE Iran) earthquake of 26 December 2003. Mw6.5 a preliminary reconnaissance report. Website http //www. mehdizare.eom/lecture-present.htm NEW%20Joumal %20Papers%20(updated%207%20April%20200... 

CA 46, 10623 (1952) (Initiation and thermal decompn of Gunpowder) 22)M.Parpaillon, MP 34, 419 20 (1952) (Preliminary treatments of expls before destruction) 23)Anon, Explosive Ordnance Reconnaissance and Disposal , US Army Field Manual FM 9-40 (1953) 24)A. 

Fermor, L. L. 1913. Preliminary note on garnet as a geological barometer and on an infra-plutonic zone in the Earth s crust. Reconnaissances of the Geological Survey of India, 43, 41-47. 

THE MADRID BASIN AQUIFER PRELIMINARY ISOTOPIC RECONNAISSANCE... 

Lopez Vera, F., Lerman, J.C. and Muller, A.B., 1981. The Madrid Basin aquifer preliminary isotopic reconnaissance. In W. Back and R. Letolle (Guest-Editors), Symposium of Geochemistry of Groundwater — 26th International Geological Congress. J. Hydrol., 54 151—166. 

Information that has been assembled on potential sources is analysed to identify the types and locations of possible contamination on the site. These are then mapped on to the physical description of the site and an initial identification is made of receptors that might be at risk. Consideration of the possible pathways between potential sources and receptors leads to a preliminary conceptual model for the site, in terms of candidate source-pathway-receptor linkages. The preliminary conceptual model is then tested and refined by observation, during a site reconnaissance. 

The objective of site reconnaissance is to explore the assumptions and conclusions of preliminary work that has been based on paper and other records. It should include land adjacent to the study site, where access is available. Firstly, the physical site description is confirmed as accurate. Then it can be extended by observations, such as the presence of unrecorded features, tanks, waste tips, surface water pounding and flow, vegetation and surface types and conditions. Secondly, the general presence and extent of sources can be confirmed. Thirdly, the presence of possible receptors can be confirmed or eliminated. Fourthly, pathways by which contamination can reach receptors, such as drains, streams or surface run-off are identified, although obviously sub-surface and airborne... 

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