Stockton Events Car Park Ground Investigation

The Homes & Communities Agency wish to carry out an intrusive ground investigation for a site identified for potential development at the Occasional Events Car Park in Stockton-On-Tees (see Figure 1).

The ground investigation will be carried out in two separate stages of work:

It is proposed that the Phase 1 Investigation site works will be carried out commencing in early January 2016. The Stage 2 investigation will be carried out following the completion of Phase 1. Based upon current programme, it is envisaged that it will be carried out during Spring 2016.

The aims of the investigation are to identify the thickness, nature and variability of made ground and drift deposits, and confirm the depth of bedrock. The investigation will also aim to characterise levels of soil and groundwater contamination and soil gas spatially and vertically across the site.

A desk study of previous GI information available for the site has indicated extensive made ground up to 8m thick on the site, underlain by alluvium, localised glacial deposits and Sherwood Sandstone bedrock.

The made ground is indicated to be highly variable, with cobbles and boulders of concrete and fused slag frequently reported. Resonance (sonic) drilling is proposed for boreholes to enable such materials to be penetrated and the underlying materials investigated.

Due to the depth of investigation required and the nature of made ground materials identified, it is anticipated that a JCB 3CX will be unable to complete the proposed trial pitting works. Previous trial pitting on the site has successfully been completed using a 20T tracked excavator.

In order to provide information on the chemical and geotechnical variability of the made ground and alluvial deposits, it will be necessary to recover continuous soil cores from a number of boreholes, with hiqh quality open tube samples obtained elsewhere. A number of boreholes will be extended into rockhead to enable investigation and installation of groundwater sampling instruments in bedrock.

Please refer to attached documentation for more information relating to this contract.

Additional information: The closing time for tenders is 1pm.

All discussions, meetings and communications will be conducted in English.

The contract will be subject to English law. Tenders and all supporting documents must be priced in GBP and all payments under the contract will be made in GBP.

This procurement and award is subject to the transparency arrangements being adopted by the UK Government. These arrangements include the publication of tender documentation issued by the HCA and the contract between the HCA and supplier. Bidders should highlight any areas they consider commercially sensitive in order for the HCA to be able to honour our transparency obligations without undermining the bidders commercial interests.

Candidates are advised that the HCA is subject to the Freedom of Information Act 2000 ("The Act"). If a candidate considers that any of the information supplied as part of this procurement procedure should not be disclosed because of its commercial sensitivity, confidential or otherwise, they must, when providing this information, clearly identify the specific information they do not wish to be disclosed and clearly specify the reasons for its sensitivity. The HCA shall take such statements into consideration in the event that it receives a request pursuant to the Act which relates to the information provided by the interested party. Please note, it is insufficient to include a statement of confidentiality encompassing all the information provided in the response.

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