Preliminary Ground Investigation Design for Colliers Knap | My Assignment Tutor

School of Environment Geography and Geoscience Unit TitleM20040 Ground InvestigationAssignment TitlePreliminary Ground Investigation Design for Colliers KnapWord Limit4000 words indicative (as includes an extensive mapping exercise)Due Date14/5/21Submission MethodMoodle Submission – single document Coursework InstructionsYour report should have 2 parts as below. You should complete this work individually.Revised Ground Model for Colliers Knap (20 % of total) Review of Geophysical Techniques for Colliers Knap (30% of total) Ground Investigation Design (including costing) (50% of total) ————————————————————————————————————————— Scenario Enviro-Gas is a local company that specialises in high-pressure pipeline installations for the gas industry. We wish to develop a new transfer facility at the site currently occupied by Farncombe House Estate Buildings and wish to bring a pipeline westwards to a location at or near the site currently known as Hill Farm from where it will enter a further network. Based upon the results of your first report, feedback given and any further work undertaken we would like a revised ground model and a design for proposed ground investigation.At this stage, we have decided to route through Colliers Knap (Figure 1) and are interested in establishing what constraints may be present at site along a chosen route specifically at Colliers Knap. We have been advised that we should use geophysical techniques to confirm geology at site but are uncertain of this guidance.The proposed construction The pipeline will be 0.5m diameter, high tensile, corrosion resistant plastic coated steel. It will operate at significant, though undefined pressure. The pipe requires a trench to be cut with minimum depth 2.0m and minimum width 2 m centred on the pipeline. As part of the construction, a corridor of ground will be cleared with a width 10 m centred on the pipeline. The pipe will be lined with sand prior to backfilling. Installation will be by our specialist contractor who can lay the pipe at a rate of 25m per day under normal ground conditions.There is a small amount of flexibility with the final alignment of the pipeline, though we seek to use a pre-defined route if possible within the constraints of the ground conditions. The route must use terminals at Hill Farm and Farncombe House and the area approved for construction. If you consider that ground conditions may require special techniques or precautions for construction, you should also indicate this and take into account any uncertainty in your guidance on route selection.We require the construction and operation to be sustainable and cause minimal damage to the natural or built environment to assist the application for planning permission.Figure 1. The chosen pipeline alignment through colliers knap.Preliminary Investigation You have been provided with geophysics and survey data inherited by GG from a 3rd party, we cannot comment on its quality and require your advice. The geophysics data was captured using: Wenner resistivity Array (ABEM Terrameter).THE REPORT Reporting should be compatible with BS5930. We would also appreciate close attention to recommendations made on report writing by AGS. Your Report, in A4 page size, should begin with: A title page, with page border, clearly stating: the title of the report, the client, the organisation that has written the report. You should take on an identity with a suitable title (e.g. Smith Associates) but please chose a title that does not incorporate your name (for anonymity of marking). The title page should also bear the date of the report. A contents page that lists all the contents (chapters, sections etc.) and figures, with page numbers. The main body of the report should be word-processed in Calibri or Arial 11 point with single line spacing and fully justified; each page should have a page number and, in a header, the site name and your student number. Where references are appropriate (for instance to justify the methods/ interpretations you have made) they should conform to the APA standard. A list of cited references should be collected in a References section as an appendix. We would anticipate a professional report such as this should include 10- 20 references covering geology, environment and information relevant to your data collection and methods.ALL MAPS MUST HAVE APPROPRIATE ANNOTATION, SCALE, LOCATION INFORMATION AND LEGEND/KEY.The report should include 2 main sections as described below and as referred to in the marking scheme. Part 1. Revised Ground Model for Colliers Knap and Supporting Evidence This part of your Report should provide a review of any data not mentioned in your first report including any air-photo interpretation, borehole records geophysics or results from a walkover survey.Part (i) of your Report should not exceed 5 (five) pages, including all figures, tables and diagrams, (this excludes cover, title page and any associated appendices). If the number of pages exceeds this, only the first 5 will be marked. Part (i) should include a map that indicates likely extents of geomorphological/ terrain zones on a single page and at least one representative annotated cross section on a further single page. These should be revisions or replacements of equivalent figures in your first report. You should provide adequate explanation of any changes.This section of your report should show evidence that you have considered the results of your findings in the context of the literature and that you have integrated the data provided as appropriate. This is an exercise in presenting relevant knowledge to the client not, necessarily presenting a list of datasets you have provided.Part 2. Review of Geophysical Techniques at Colliers Knap Part (ii) of your Report should not exceed 6 (six) pages, including all figures, tables and diagrams. If the number of pages exceeds this, only the first 6 will be marked. This section of the report should provide an evaluation of three different geophysical techniques; resistivity, conductivity and ground penetrating radar and whether they would be useful in further investigation at the site. Your review should consider the resolution, signal to noise, depth of penetration and contrast of each technique that you would expect at the site. Your review should include reference to relevant case-studies. Your review may take the form of a table or can be presented in conventional written format. Part 3. Ground Investigation Design Part (iii) of your Report should not exceed 6 (six) pages, including all figures, tables and diagrams. If the number of pages exceeds this, only the first 6 will be marked. This section of the report should detail your rationale and approach to investigation. You should take into account any standards that should be adhered to, especially for sampling.Please ensure that if you are retrieving samples, that your extraction method is suitable. All sampling and testing must take into account the minimum standards required for sampling and sample size as defined using BS1377. This means if you wish to retrieve samples for most geotechnical testing you will require rotary coring unless you provide strong justification based upon other knowledge.Part (iii) should include a plan and costing a ground investigation with any associated laboratory testing priced according to Table 1 and Table 2 (Attached), by WW Drilling & Testing Ltd. For indicative costs for any tests not presented (for instance geophysics), please contact AG. We impose an absolute limit of £5000 excluding VAT to the costs of works and testing. THIS IS NON-NEGOTIABLE. If for any reason this is not possible you should price accordingly and ensure that that you justify any further costs.You should clearly show:your estimate for cost (including mobilization costs) and the practicality of your sampling/testing programme. the rationale behind and nature of any further information that you hope to gain from the investigation. your objectives, a plan (map) showing the location of any proposed investigation(s) and relevant tables detailing costs. Any proposed borehole and or trial pit must be accompanied by a schedule itemising the costs associated with that borehole, including testing etc. —————————————————————————————————————————————— Table 1. Drilling and Associated Works. Cost data from WW Drilling & Testing Ltd. [all costs inclusive of VAT and local taxes] Drilling Rate £ Transport light cable percussion rig and personnel to site and remove on completion of works 400.00 Set-up, dismantle and move rig between boreholes 100.00 each move Boring by light cable percussion rig between GL and 10m 20.00 per metre Ditto: 10m to 15m 25.00 per metre Ditto: 15m to 20m 30.00 per metre Ditto: 20m + 40.00 per metre Excavate starter pit 50.00 each Extra-over for breaking out concrete etc. re excavate starter pit 100.00 Take 100mm undisturbed samples GL to 15m 20.00 each Ditto: 15m + 25.00 each Standard Penetration Test GL to 15m 10.00 each Ditto: 15m + 15.00 each Take small disturbed samples 5.00 each Take bulk samples/ water samples 5.00 each Install standpipe 50mm diameter 15.00 per metre Protective cover re above and re-instatement 100.00 each Trial Pits £1500 per day (to include machine & driver together with superviser to log pits and provide report. Cone Penetration Testing £500 rig mobilisation + £1500 per day on-site to include qualified operator to conduct tests and report on results Geophysical Testing £1200 per day for each technique (Resistivity, GPR, EM31, Magnetometer) to include qualified operator to conduct tests and report on resultsTable 2. Laboratory Testing CostsCost data from WW Drilling & Testing Ltd. [all costs inclusive of VAT and local taxes] Marking Criteria. Student ID…………………………………………..Comment.>70% Excellent60 to 69% Very Good50 to 59% Good40 to 49% Acceptable


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