In consequence of fact that engineering mapping foundation about the strike and orientation of great diameter collector of sink waters were absent, engineering company, which was designed to realise a transport building was in need of its real situation determination. Actual part of specification was 500 m long and the building locality was situated in urban area. Thereabouts to the sewerage collector a road with high level of traffic was situated and direct above the collector position pavements, parking areas, gardens and buildings were localised. Engineers assumed the top of the collector gallery is positioned in the depth approximately 2 - 3 m. Sewerage collector had a rough trapezoidal cross-section with the base of approximately 6 m and high of about 3.5 m. Studied area is built mainly by sandy up to sandy gravel quaternary sediments and the collector body was covered by a layer of crushed stone landing.


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