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TRANSCRIPT
2
Table of Contents ............ 3
Decommissioning Methodology .................. 4
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........................... 6
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Case Studies ................................................ 11
Landowner Comfort 3
takes place
Methodology
1. Site Prior to Commencing
3. Area Rolled and Trimmed
2. Geobind Mixed with Soil in-situ up to 320mm
4. Surfacing Laid, Ready for Traffic in 24 to 48hrs
One Day Programme
Geotech do not use Lime so through our innovativedecommissioning process and land regeneration scheme weare able to restore the pH and fertility of the soil to exactlywhere it was before work commenced.
Geotech make it our mission to reduce the environmentalharm resulting from Lime and Cement stabilisation or othertraditional construction methods such as stone or aggregateimport or metal trackway, which lack sustainability. A key partof Geotech’s inception and the design of our Geobindproprietary binder is to overcome and provide an alternativeto these highly damaging methods.
This has proven extremely beneficial to many of ourclients and often gives them a significant advantage in tenderapplications. The landowner is left with the same fertile landthey had prior to commencing and the local environmentremains unharmed.
Through our revolutionary binder and process, clients
comfort.
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Decommissioning Methodology
Preliminary Site
Samples Sent to Lab to Ascertain pH and Nutrients
Re-agent Agreed
Mobilise to Site
Removal of Stone Surfacing
Break up Sub-Base
Spreading and Grading Top Soil
Re-Seeding as Required Decommissioning Methodology
A preliminary site investigation prior to and afterconstruction is undertaken by a UKAS accredited testing houseto Geotech requirements ensuring that the decommissioningwork and subsequent soil regeneration will be successful.
The process from there is relatively straightforward. Stonesurfacing is scraped off with a 13 tonne excavator and is offeredto the landowner for re-use. A tine attachment is then used tobreak up the stabilised sub-base. Re-agent is then applied witha dust free spreader to bring the soil back to its originalproperties. The top soil is then spread and graded to therequired level by use of a dozer.
Top soil is then cultivated with a tractor pulled tillage beforere-seeding is undertaken to landowner preference.
Geotech will then return within a few months to review there-growth and ensure the landowner’s satisfaction has been met.
Re-agent Addition toNeutralise Soils
Landowner Comfort 5
Programme
Break Up Sub-Base
Seeding
Re-agent Mixed In
Process Completed
Part of the service Geotech provides post-completion ofworks is the regeneration and restoration of land back to itsoriginal properties and optimum fertility.
Geotech understand the importance of soil fertility to landowners, it is often their livelihood. Geotech will test pH levelsas well as various nutrient levels such as nitrate and potassiumpre-start and will return them to the same levels ondecommissioning.
Geotech will undertake individual, site specific, bench scale testsin order to correctly ascertain what is required in order to returnthe pulverised stabilised material back to it’s optimum fertilityand conditions. Returning the pH back to original levels is asimple process. Geotech will use specific re-agents in order tooptimise nutrient and pH levels.
Geotech remove any concerns or responsibility from the landowner to return the land back to its original condition. Geotechensure that farmers and land owners are left with soil that isboth fertile and aesthetically pleasing once works have beendecommissioned.
will test
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This section explains the process by which ourstabilised soils can be regenerated for agricultural
use as was evaluated by one of our UKAS accreditedTesting Houses.
Nahcolite Chemical Structure
A Nahcolite Crystal
Objectives‒The objectives for the geochemical test workprogramme discussed herein were to assess the geotechnicalperformance of Geobind to stabilise agricultural soils anddevelop a strategy for neutralising the high pH encounteredwithin the stabilised soil matrix. This included an assessmentof changes in the nutrient status following recovery of stabilisedsoils back to circum-neutral pH. Methodology‒Trials were conducted on an orange grey clay.Specimens were manufactured at 1.5% Geobind and a strengthgain curve determined over a 28 day curing period with anadditional simulated time point at 365 days based on curingspecimens under an accelerated aging protocol.
Stabilised materials were neutralised using nahcolite (NaHCO3)to assess Acid Neutralisation Capacities and terminal pHfollowing treatment. Additional ANC’s were determined byMonotonic strong acid titration using dilute nitric acid.
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Nutrient status was determined in accordance with DEFRARB 209 and BS 3882 methods for parent soils and compared withtreated materials post neutralisation.
Conclusions‒Nahcolite was observed to successfully neutraliseGeobind stabilised soild pH without adverse effect to nutrientstatus. Moreover the neutralisation strategy was demonstrated toimprove the potential fertility of soils based on availablephosphate, potassium and micro-nutrients copper and zinc.
It is recommended that where recovery to a specified agriculturalstatus is required, neutralisation trials should be undertakento assess end product nutrient availability and hence allowexternal amendment if required.
Neutralisation Strategies should be developed on a project specificbasis whereby the optimum solution is likely to incorporate bothnahcolite and dilute acid amendment to readjust soils to specificpH. The application of dilute nitric and phosphoric acids maybe advantageous for certain sites where amendment of the finalnitric and phosphoric levels is required.
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Geobind with Nahcolite is demonstrated.
Landowner Comfort 9 Landowner Comfort 9
proven to be sufficient at our standard 28 day curing time.
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Environment Agency
Chris Hall
Hazardous Waste Process
Environment Agency
“If the original specification of mixing 2.5% Geobind stabiliserto 97.5% spoil (a mixture of earth and rock) is adhered to, andthe original spoil is not contaminated by other “dangeroussubstances”, there should be no reason to categorise theexcavated material as hazardous or special. I would suggest that170504 (soils & stones not containing any hazardous substances)is the relevant EWC code for the waste where there is no othercontaminant. If there are other contaminants present then ananalysis of the material would be required to identify whetherthe waste is hazardous, in which case the relevant EWC codeis 170503*.”
Landowner Comfort 11
Regrowth Photos
Devon: Grass Begins to Grow
Crewkerne: High Crop Regrowth
Crewe: Seeded Haul Road Crewe: Haul Road - Grass
Begins to Grow
Crewe: Seeded Haul Road - Grass Begins to Grow
Dorking: Crops Begin to Regrow
Beeston: High Grass Regrowth
Crewe: Compound - High Crop Regrowth
Crewkerne: Crop Regrowth Begins
