Trans-UK Gas Pipeline Corridor Feasibility Study

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Trans-UK Gas Pipeline Corridor Feasibility Study
Introduction
Network Gas are installing a major gas pipeline across the UK, which must cross the Cotswold escarpment in its east to west traverse across the UK. The selection of the pipeline route must take into account a number of factors, including:
Terrain evaluation and geohazards including faults, landslides, zones of seismic activity, karstic areas, cambering, presence of underground voids, springs and rivers.
Your company has been tasked with providing a desk study and field survey report to assist Network Gas in their corridor selection across the Cotswolds.
Site selection
The proposed site for the pipeline to cross the western side of the Cotswolds is located around the village of Broadway, Worcestershire (see location map). The report should consider all of the elements above including terrain evaluation and geohazards and constructability using detailed desk study, aerial photographic interpretation and field survey.
Report guidance
The report will involve three phases; firstly a desk study to collate all existing information on the site along with an aerial photographic interpretation; secondly, walk over survey and terrain evaluation of the site to validate desk study and thirdly, recommendations as to the optimum alignment of the pipeline. A suggested report structure is detailed below:
CONTENTS
EXECUTIVE SUMMARY (see separate example)
1. INTRODUCTION
Objectives
Provide a short paragraph detailing the objectives of the study.
Site information
Information and location of the site including location map, site boundaries, National Grid reference or other map reference.
Information sources used in this study
Provide table listings of all information sources used in the preparation of this report; include a short description and source for the data.
2. DESK STUDY
2.1 Applied geology
Include geological map with table and descriptions of strata and approximate thickness from geological map or memoirs. Note any geotechnical data pertaining to geology present.
2.2 Hydrogeology and Hydrology
Information on surface and groundwater including springs and river courses using evidence from topographic maps, historic maps or airphotos. Groundwater conditions and hydrogeology including springs, issues and wet areas related to geology and main aquifers and aquicludes.
2.3 Historical Land Use
Site history and past uses of the site and adjacent sites from historic and current maps and aerial photos. Record evidence of any recorded quarry workings.
2.4 Aerial photographic interpretation
Include map and discussion of features identified. Ensure that flights dates, heights, scale, name of company flying and recorded. Comparison with results with other information (topographical maps, visual inspection).
3. SITE RECONNAISSANCE
3.1 Overview of field survey
Provide brief overview of survey including dates, weather and who undertook the mapping. What field equipment and maps were used.
3.2 Geomorphological features encountered
Describe the nature and extent of any landforms, geology or hydrological information acquired and refer to field maps.
4. CONCEPTUAL SITE MODEL
4.1 Geological ground conditions
This section will be used by the pipeline engineers, so specify what type of geological ground conditions can be expected once excavation starts. Important to provide approximate depths
4.2 Geomorphology.
Again this section will be important to the engineers and so be specific about the types of engineering geology and geohazards that can be expected in this area. The engineer needs to be fully appraised of any potential problems – try and explain how these may affect a pipeline.
5. RECOMMENDATIONS
5.1 Pipeline alignment.
Recommendations for pipeline alignment through this site to minimise impacts from known geohazards and suggestions for engineering solutions to any problems that cannot be avoided.
6. SUMMARY
6.1 Concluding remarks
Provide a brief summary of key points from three phases.
6.2 Limitations
Provide a summary of any limitations in this report.
APPENDIX
These types of reports are not written as continuous prose (like an essay), rather they are split into a series of short paragraphs which summarise specific key points. Figures, maps and tables are presented in an appendix at the end of the report. Take a look at the example ground investigation report provided on Moodle. Keep each section brief and to the point.
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