Concise Minerals Resource Assessment- West Sussex

Concise Minerals Resource Assessment- West Sussex

Concise Minerals Resource Assessment – West Sussex

Summary

Omnia were commissioned to undertake a concise Mineral Resource Assessment at a site in West Sussex. At feasibility stage it was considered that given the limited size of the site (0.66 ha) and surrounding residential and light industrial setting, alongside hydrogeological settings that a concise report would be appropriate as it was considered likely that extraction would not be economically viable.

Scope of Works

Works to produce the concise MRA included:

  • Consideration of the requirements of the Minerals and Waste Safeguarding Guidance and Policy of the Joint Minerals Local Plan;
  • Review of previously completed site investigation information; and,
  • Local data search via online BGS Mapping to assess the geological setting of the site, including review of local historical boreholes in the area within close proximity to the site.

The standalone Minerals Resource Assessment was reported and included:

  • Assessment of mineral resource present beneath the site;
  • Assessment of workable area taking into account required standoffs from buildings, infrastructure and trees;
  • Assessment of the volume of workable mineral resource present beneath the site;
  • An assessment of whether the pre-construction working of the site would prevent or render unviable the implementation of the development within the timescales of the Local Plan.

Outcome

The MRA determined that the site would be unlikely to prove economically viable for extraction due to the following reasons:

  • Small size of the site (0.66ha);
  • Limited thickness of Head Gravel (1.80m) containing up to 22% fines;
  • Limited Thickness of Raised Beach Deposits (0.60m) containing up to 24% fines and 15% gravel.
  • Likely requirement for the dewatering excavations due to shallow water table as set out above;
  • The location of the site which is in a primarily horticultural/light industrial area with residential properties

The findings of the Minerals Resource Assessment were accepted by the Local Authority.

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Olivia Maxwell

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Detailed Minerals Resource Assessment- Home Counties

Detailed Minerals Resource Assessment- Home Counties

Detailed Minerals Resource Assessment – Home Counties

Summary

Omnia were commissioned to undertake a detailed Mineral Resource Assessment at the site, as it was considered given the large size of the development area (16 ha) and the locality within a Mineral Safeguarding Area for Sand and Gravel, that the area may be deemed economically viable for extractions.

Scope of Works

Works to produce the detailed MRA included:

  • Review of online BGS Mapping to assess the geological setting of the site, including review of historical boreholes in the area;
  • Assess volume of extractible mineral present beneath the site;
  • Liaise with representatives of commercial aggregate operators to establish whether or not the site is considered economically viable;
  • Due consideration given to the neighbouring high sensitivity water body and associated pollution control measures;
  • Review of previous ground investigations completed on the site;
  • Additional Ground Investigation to obtain samples from the underlying mineral resource to assess grading quality of the resource.

The standalone Minerals Resource Assessment was reported and included:

  • Assessment of mineral resource present beneath the site;
  • Assessment of workable area taking into account required standoffs from buildings, infrastructure and trees;
  • Assessment of the volume of workable mineral resource present beneath the site;
  • Consultation with local commercial aggregate companies regarding whether the resource beneath the site is of economic interest;
  • Discussion on potential pollution control measures and impact on extraction potential;
  • An assessment of whether the pre-construction working of the site would prevent or render unviable the implementation of the development within the timescales of the Local Plan.

Outcome

Once complete, Omnia were able to conclude that one area of the site (totalling an area of approximately 4.6 ha, rather than the whole 16 ha) was considered potentially viable for extraction.

Two out of three aggregate operators expressed a potential interest in the mineral reserves beneath the site, however as the site lies within a sensitive area, concerns regarding the controlled waters receptors (relatively shallow groundwater across site, location of a river along one boundary, the Chalk Aquifer beneath the sand and gravel, and the location within an SPZ2) and the requirement for an Environmental Permit to facilitate restoration to form a development platform. This was along concerns relating to the likely requirement for the installation of a geological barrier prior to infilling in order to protect controlled waters receptors.

Given the above aspects and limitations Omnia concluded the use of incidental mineral extraction during the course of the development is likely to be the most feasible.

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Olivia Maxwell

Principal Geo-Environmental Consultant

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Geo-Environmental Consultancy- West Sussex

Geo-Environmental Consultancy- West Sussex

Geo-Environmental Consultancy – West Sussex

One of our projects in Sussex is approaching the final stages of a long running complex site–investigation. The works are associated with the redevelopment of a parcel of land adjacent to the River Adur to a mixed commercial and residential end use. Omnia were asked to provide our client with geo-environmental consultancy support which would assist them with their design and planning process.Our aim was to obtain the necessary information to provide the client with an understanding of potential environmental liabilities and risk associated with the ground conditions on site.

Our work started with a desk top study, which progressed to phased intrusive investigations including cable percussion and windowless boreholes sampling and associated groundwater sampling.

During the investigation elevated TPH (Total Petroleum Hydrocarbons) were identified, which  was recovered as a thick, gloopy Non-aqueous Phase Liquid (NAPL) product. From a review of historic mapping, onsite observation and assessment of the product it was concluded that a neighbouring  adjacent scrap dealer was a potential  source.

Phased investigation allowed the estimated plume area to be reduced by 25% which assisted in a reduced remediation requirement for costing purposes.

Omnia have now been appointed as the Clients Consultant for the remediation phase allowing site presence and review of remedial activities as the site progresses.

Some of the free product recovery techniques used by the remediation contractor include down hole bailers to collect product alongside the use of belt skimmers. The belt skimmer is placed in the borehole and acts like a conveyer belt, allowing the product to be brought to the surface before being collected  and the product allowed to run into an IBC for disposal.

We look forward to continued involvement in this project, seeing the remediation phase completed, and the redevelopment of this area to continue.

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Air Quality Monitoring

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Air Quality Monitoring – Birmingham

Summary:

Our Principal Air Quality Consultant conducted a longitudinal study using diffusion tubes to monitor air quality at a school in Birmingham.

The school is located next to a busy road, surrounded by motor vehicles and suffers from high levels of road traffic emissions during peak hours. In an effort to monitor and assess nitrogen dioxide (NO2) concentrations in the school atmosphere, the school administration appointed Omnia to conduct an Air Quality Assessment on the school grounds.

The purpose of the study was to measure NO2 concentrations in the MGPA atmosphere and assess the risk associated with NO2 exposure to children, teachers, staff, and other visitors to the school.

Tube attached to pole for air quality monitoring purposes
Air Quality Consultant putting tube in place for air quality monitoring

Scope of Works:

Diffusion tubes were used to measure NO2 concentrations at the MGPA. The tubes were placed in four different locations at the school: the playground, the parking lot, the entrance, and the exit. Each tube was left in place for four weeks and the results were compared to the UK air quality objective of 40 μg/m3.

Outcome:

The results of the study showed that NO2 levels at the MGPA were below the UK air quality objective due to nearby road closures during the time of monitoring. The results of the analysis showed that the nitrogen dioxide levels were reasonably acceptable.

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Huw Thomas

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Supervision of Remediation Works

Supervision of Remediation Works

Supervision of Remediation Works

Omnia were commissioned to provide geo-environmental consultancy support to address the requirements set out within the designers RMS and incorporate feedback from the Environment Agency.

The project was a large site located in Silvertown in London, the site and surrounding is a historically industrial area, which is undergoing major redevelopment. The site had previously undergone serval phases of investigation where contamination in the form of TPH including free phase production had been identified.

Scope of Works:

Omnia’s work included:
•Supervision of Remediation Works;
•Installation of Groundwater Monitoring Wells;
•Post-Remediation Groundwater monitoring; and,
•Production of Remediation Verification Report.

Omnia were in attendance throughout the duration of remediation enabling works to supervise the excavation and removal of grossly impact soils which were subsequently remediated using biopiles. Omnia made regular contact with the Client and the environmental consultant to provide updates on works and inform them of previously unknown contamination hotspot.

Outcome:

Validation samples and follow on groundwater monitoring demonstrated that works had been carried out successfully, with Omnia producing a Validation Report which concluded the site as suitable for the proposed end use.

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Coal Mining Risk Assessment

Coal Mining Risk Assessment

Coal Mining Risk Assessment

Omnia were commissioned to undertake a combined Phase I Desk Study including an accompanying Coal Mining Risk Assessment (CMRA) for planning application purposes for the construction of new industrial units within an existing industrial estate.

The site and the surrounding area has a long history of coal mining; including both opencast and underground mine workings.

Scope of Works

The CMRA was conducted in conjunction with the Phase I Desk Study to incorporate coal mining data from a plethora of sources, including the Coal Authority and British Geological Survey (BGS) to assess the impact that legacy coal mining activity would pose to the future construction of the site.

Outcome

The CMRA identified four coal seams beneath the site, two which were classified as shallow to the ground surface. Furthermore, to add to the complexity of the situation the site has been identified as lying within an old historic opencast working with multiple high wall features.

This had led to the recommended requirement of intrusive ground investigation works such as rotary borehole to investigate the depth to, and thickness of, anticipated coal seams (s), as well as, the condition of the overlying strata beneath the site for potential workings which could affect the stability of the ground surface. A method of investigation highlighted within CIRIA guidance document C758D and indorsed by the
Coal Authority. Omnia are continuously in talks with the client to aid them throughout the process and if required Omnia Consulting are able to carry out the ground investigation works of this nature.

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