Land Contamination: Technical Guidance on Special Sites: Acid Tar ...

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Table 6.2 - Remedial Options/Techniques – Groundwater (continued)RemedialTechnologyBiospargingNatural AttenuationPotentialEffectiveness ofTechnologyEffective fordissolvedhydrocarbons butnot for free phasesince could dispersethe product. Canform a ‘polishingsystem’. Slowrelease peroxidescan form a passivesystem.Effective for lighterends of petroleumproducts. Dependenton hydrogeology ofsite.OperationalRequirementsUsual wells, pumps,blowers, etc.Monitoring andsampling wells.Special PermitRequirementsMobile plant wastemanagement licenceSocial/CommunityImpact IssuesModestInformationRequirementsHydrogeologicalcharacterisation with airsparge test andcharacterisation ofnature of free phase anddissolved hydrocarbonsHydrogeologicalcharacteristics andrepeated monitoring. ofcontaminant plume.Post Remediation ConditionsShortTermValidation√√Long TermMonitoring√√OtherR&D <strong>Technical</strong> Report P5-042/TR/04 44
6.4 ValidationThe principles of validation are the same for the remediation of acid tar sites as for othercontaminated sites.In the case of strategies involving the removal of the acid tars for off-site licensed disposal orincineration (whether after pre-treatment or not), there will be a need to verify that theremoval exercise has met the agreed criteria. Normally, this will involve taking samples atthe base and edges of any excavation to confirm the degree and extent of any residualcontamination together with random sampling in other areas.If groundwater is to be remediated (for example, if there are free oils) then the normalprinciples will apply. Thus groundwater monitoring will be required at appropriate locationsaround the acid tar lagoon. Monitoring will be necessary before, during and afterremediation, until risks are properly managed and a statistically valid data-set has beenobtained that demonstrates that the concentrations and trends are acceptable. If groundwateris not to be remediated (i.e. if the strategy is one of mass removal of the source) thengroundwater monitoring post-removal over a similar (or longer) period will still beappropriate. This will be required in order to demonstrate the improvement in groundwaterquality and, where relevant, to demonstrate that natural attenuation is occurring in accordancewith predictions.If the remedial strategy involves stabilisation techniques such as DCR then it will benecessary to demonstrate that the agreed performance criteria are met in the finished product.If the product is to be disposed of or re-used on site (subject to any necessary wastemanagement licence) then consideration will be required of demonstrating longer-termperformance. In the case of an engineered landfill, this would in any case be addressedthrough the waste management licensing procedure.R&D <strong>Technical</strong> Report P5-042/TR/04 45
Page 1 and 2:
Land Conta
Page 3 and 4: CONTENTSFOREWORDiGLOSSARYii1. Intro
Page 5 and 6: FOREWORDPart IIA of the Environment
Page 7 and 8: CresolsCreosoteDCRDesorptionDesulph
Page 9 and 10: PVCRCRASelosafeSodium saltsSodium h
Page 11 and 12: 1. INTRODUCTION1.1 BackgroundThis r
Page 13 and 14: SECTION 2: INDUSTRIAL PROCESS/FACIL
Page 15 and 16: 1.5 Linkages Between the Gu
Page 17 and 18: 2.1.2 Overview of acid tar lagoon s
Page 19 and 20: Overall CommentsAcid tars can be of
Page 21 and 22: White Oil• Acid tar lagoons from
Page 23 and 24: Box 2.5 Scenario: Acid tar disposal
Page 25 and 26: 3. CHEMICAL AND PHYSICAL CHARACTERI
Page 27 and 28: Table 3.1 - General Physical Charac
Page 29 and 30: The chemicals listed in Table B.1,
Page 31 and 32: 4.2.3 Common mistakesIt is possible
Page 33 and 34: Geophysical methods, such as resist
Page 35 and 36: Investigation locations will need t
Page 37 and 38: • gas chromatography by simulatin
Page 39 and 40: 5.2.2 Water environmentThere is lit
Page 41 and 42: 5.3 Assessment of Investigation Dat
Page 43 and 44: 6. REMEDIATION ASPECTSKEY QUESTIONS
Page 45 and 46: 6.2.5 Solidification and stabilisat
Page 47 and 48: Box 6.1 Example of Remediation of A
Page 49 and 50: 6.3 Natural AttenuationNatural atte
Page 51 and 52: Table 6.1 - Remedial Options/Techni
Page 53: Table 6.2 - Remedial Options/Techni
Page 57 and 58: • all personnel should follow a d
Page 59 and 60: Verschueren (1983) Handbook of Envi
Page 61 and 62: USEPA. Innovative Site Remediation
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