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P. 1010-158-42169 Ground Investigation - Supplementary testing details010-158-42169 Ground Investigation - Supplementary testing detailsRatings: (0)|Views: 3|Likes: 0Published by Ben Metcalfe010-158-42169 Ground Investigation - Supplementary testing details010-158-42169 Ground Investigation - Supplementary testing detailsMore info:Categories:Types, Government & PoliticsPublished by: Ben Metcalfe on Jan 07, 2013Copyright:Attribution Non-commercialAvailability:Read on Scribd mobile: iPhone, iPad and Android.download as PDF, TXT or read online from ScribdFlag for inappropriate content|Add to collectionSee moreSee lesshttps://www.scribd.com/doc/119298473/010-158-42169-Ground-Investigation-Supplementary-testing-details01/07/2013pdftextoriginal W H R DurieAlder KingPembroke House15 Pembroke RoadBristolBS8 3BA22 September 2006Our Ref: BD2006-Highbridge 060922
Dear Mr Durie
LAND AT NEWTOWN ROAD, HIGHBRIDGE, SOMERSETSUPPLEMENTARY GEOENVIRONMENTAL AND GEOTECHNICAL INVESTIGATIONSINTRODUCTION
In line with recent discussions and E-Mailed correspondence, we are pleased to present a formal proposalfor undertaking a programme of intrusive investigation and assessment for the above site. Ourunderstanding is that Alder King wishes to prepare a technical sales package for the site, to informprospective purchasers and the Regulatory Authorities of ground conditions and the steps that may berequired to realise appropriate development. The focus of this proposal is therefore to allow for anappropriately scoped ground investigation that will provide the relevant baseline technical information tosupport these requirements.Parsons Brinckerhoff Ltd (PB) has carried out a Preliminary Contamination Assessment across a portion ofthe current development site back in 2001. The results of this study related to an area of approximately1.5 ha and dealt primarily with soil and groundwater contamination issues. The new study site boundaryincludes the area assessed in 2001 but has been increased to accommodate an additional 0.7 ha. Ageotechnical assessment did not form part of the previous scope of work data however this is now requiredto complement the technical sales package.
In summary and in line with producing the most beneficial and informative selling package, the key technicalrequirements are as follows: -
soil and groundwater quality assessment across the new, expandeddevelopment area.
A re-appraisal / check on soil quality issues across area subject to 2001 study.
To conduct a geotechnical appraisal for the entire site area complete with an option assessment forlikely future foundation design.The scope of work required to achieve the above is as follows: -
Review existing chemical data and findings in light of latest environmental legislation.
Recover additional soil samples from the original area using trial pitting techniques in order toschedule more detailed chemical analysis.
Investigate and sample soils / perched waters across the new extension areas using trial pittingtechniques.
Construct two geotechnical boreholes to carry out insitu geotechnical testing and recoverrepresentative samples for laboratory geotechnical testing.
Chemical analysis of both soils and perched groundwaters.
Contamination & Geotechnical Appraisal.
Report Merge, combining the findings of the 2001 study and the new 2006 assessment.Our proposed re-sampling across the previous investigation area will be minimal. Having reviewed the soilchemistry data contained within the 2001 report and in light of Current Best Practice Guidance on theinvestigation and assessment of contaminated land, we consider it would be prudent to perform some re-runs of certain chemical analysis. Whilst the previous soils metals analysis would appear reasonablycomprehensive, speciation of the Poly-aromatic hydrocarbons (PAH) compounds for example was notcarried out. Furthermore, laboratory detection limits were not as low as they now need to be and theMCERTS accreditation status required of laboratories today by the Environment Agency was not relevant in2001. Contaminant screening criteria and guidance has advanced significantly over the past six years, withthe advent of CLEA UK risk assessment modelling tools. Today assessments are more compound specifictaking into account the toxicological and carcinogenic properties of a much broader range of potentialcontaminants. For the most robust assessment therefore and to fully satisfy the regulatory authorities, weare strongly recommending a limited re-run in the previous area and have costed for this accordingly.
We are in possession of the historical mapping information from the previous investigation and would look tomake use of this data to expand our understanding of the site area and any implications the site history mayhave had across the new investigation areas. Although we not expect to have to purchase the mappingseries for this study, we would recommend procuring the environmental data-sheets for the site consideringthe period of time that has elapsed since our last efforts. All in-house historical mapping data together withthe updated environmental datasheets will be reviewed to provide an up-to-date understanding of the overallsite and to guide investigation design. A robust initial Conceptual Site Model (CSM) for the site will bedeveloped using this data, to be refined during the investigation and reporting phases.
The following sections set out proposed working methods, anticipated timescales and fees for all site works,plus chemical analysis scope and level of reporting. The work will be executed in accordance with bestpractice and with reference to BS5930: 1999 – Code of Practice for Ground Investigation and BS10175Investigation of Potentially Contaminated Sites. All field and laboratory geotechnical testing will be carriedout in accordance with the Specification for Ground Investigation (Thomas Telford, 1993) and BS1377:1990 – Soils Testing Methods for Civil Engineering Purposes.
Trial Pitting Investigation In the first instance we propose 2 No. days of trial pitting. This exercise will allow soil description andsampling to take place from discrete soil horizons ultimately feeding into the main contamination andgeotechnical assessment. All trial pits would be excavated used a JCB type excavator to approximately 3 or4 metres depth and we would expect to complete in the region of 8 - 12 pits in total. We would expect toexcavate approximately 4 pits across the area previously investigated (2001 study), with up to 8 pits acrossnew areas.On completion, trial pits would be backfilled in reverse order, compacted and left slightly proud of originalsurface level to allow for longer-term consolidation. At this stage we have not allowed for the trial pits to besurveyed to ordnance datum.
Borehole Investigation We propose assessing groundwater, gas and geotechnical issues below the site by constructing 2 No.boreholes into the underlying superficial strata. It is anticipated that each borehole will need to be drilled toa depth of around 7 – 10 m below ground level (bgl). Each borehole will be fitted with combinedgroundwater and soil gas monitoring instrumentation (HDPE stand-pipes), completed with lockable covers.At this stage we have not allowed for the boreholes to be surveyed to ordnance datum.During the construction of each monitoring borehole Standard Penetration Test (SPT) data will be collectedat regular depth intervals and bulk soil samples recovered for laboratory geotechnical testing. These datawill feed into the overall geotechnical appraisal. All boreholes will be allowed time to adjust post installationand then developed, or purged, prior to groundwater sampling.
Soil and Groundwater Chemistry Representative soil samples from each geological horizon will be recovered for analysis by a UKAS andMCERTS accredited laboratory for a comprehensive range of determinants. These will include thoseincluded under the CLEA guidance, as well as pH, nickel, copper, cyanide, sulphate, mercury, selenium,zinc, speciated PAH, TPH and volatile organic compounds. In addition, soils will be routinely screened forAsbestos Containing Materials (ACM’s). A similar range of analysis will be carried out on representativegroundwater samples recovered from the monitoring boreholes. We have allowed for the following numberof samples in our proposal: -
Up to 12 No. soil samples for chemical analysis and/or leachability testing; and
A total of 2 No. groundwater samples (one from each of the boreholes).
Geotechnical Testing In addition to in-situ field testing for geotechnical parameters, sub-sampling and laboratory geotechnicaltesting will be carried out on representative soil samples in accordance with the Specification for GroundInvestigation Thomas Telford (1993) and include Particle Size Distribution, Atterberg limit testing, watersoluble sulphate and pH analysis.
A combined Geo-Environmental and Geotechnical baseline assessment report will be produced. The reportwill include geotechnical recommendations relevant to the proposed development, i.e. likely foundationrequirements and allowable bearing pressures, and will provide a Tier 1 assessment of soil and controlledwater contamination issues associated with the site, sensitive to a range of potential end uses (including aresidential end-use). As a matter of course, the report will also incorporate the findings of our desk basedreview of the 2001 study and include a refined CSM. An assessment of soil gas risk will also be made andallowed for in any preliminary foundation design advice. The methods for all assessment will be inaccordance with current best practice guidance.At this stage we feel it is unlikely that there will be a need for a fully quantitative soils or controlled water riskassessment. This therefore has not been costed for.
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