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Potential Pollutant Linkages 7.33 The potential pollutant linkages are assessed below: Contamination Source Contaminants associated with made ground on site – Hydrocarbons Ground gases – deep made ground or off site refuse tip Contaminants from off-site sources e.g. garage Pathway Hazard Potential Receptors Direct contact, ingestion, dust inhalation Direct contact, ingestion, dust inhalation Lateral and vertical migration Lateral and vertical migration Lateral and vertical migration and inhalation Direct contact, ingestion, dust and vapour inhalation Human health risk Human health risk Pollution of the water environment Human health risk Human health risk Human health risk Site construction workers Linkage Complete Yes, can be removed by the use of appropriate PPE and limited exposure. Site end users Yes, there is a possible risk to site end users but this will be mitigated by the presence of buildings or hardstanding over much of the site. Aquifer and Espedair Burn Adjacent properties Possible but unlikely. No known groundwater abstractions present. River. No groundwater recorded within the reservoir area in the trial pits, indicating flow is negligible. No. Predominantly commercial properties in the direction of groundwater flow. Surrounding area is covered by glacial till. Site end users Yes, mitigated by monitoring or incorporation of gas membrane Site end users No contamination identified likely to arise from off-site sources 7.34 In summary, based on an assessment of the chemical results, the site presents a low risk to site end users in view of the commercial nature of the development; all the site area will be covered by hardstanding or buildings. Some TPH and PAH has been recorded in groundwater within the backfilled reservoir, which could pose a potential migration risk. 11562 22 Paisley Aldi Stores Ltd March 2013
8 DISCUSSION 8.1 Development proposals are to construct a food store in the southern part of the site with associated parking and landscaping areas. Contamination Assessment 8.2 The results of the laboratory chemical testing indicate that slightly elevated levels of benzo(a)pyrene (a non-volatile PAH hydrocarbon) are present within the ash based made ground across the site. Given the nature of the development, any risk presented by the ash based made ground will be mitigated by the vast majority of the site being under the proposed store and hardstanding. Any areas of soft landscaping will require a minimum of 300mm of clean cover if ash based made ground is present. 8.3 TPH contamination was confirmed in the soils and groundwater in the north western part of the site within the former backfilled reservoir. The concentrations of hydrocarbons within soils are not at levels which pose a risk to a commercial development and require no specific remediation in this context. 8.4 Some localised hydrocarbon contamination was recorded in a groundwater sample from WS6; however, as the trial pits did not record any seepages in this area despite a substantial gravel content in the soils, it seems likely that groundwater is very localised with negligible flow. Based on the presence of glacial till beyond the reservoir area, potential for impact on the water environment is considered very low. 8.5 There may be some areas of contamination which were not identified during the investigation. If any significant visual or olfactory evidence of contamination is noted during the site redevelopment, advice should be sought from an appropriately qualified geo- environmental engineer to assess the nature and risk posed by the contamination. Disposal of Materials 8.6 Waste classification testing has not been carried out. If ash based made ground materials are generated during development, then it is likely that further chemical screening may be required to determine the waste classification of such materials once generated. WAC analysis will be required if any natural ground is to be disposed of as inert waste. 11562 23 Paisley Aldi Stores Ltd March 2013
Page 1 and 2: Report Ref Client: Aldi Stores Ltd
Page 3 and 4: Site Investigation Executive Summar
Page 5 and 6: 1 INTRODUCTION 1.1 3e Consulting En
Page 7 and 8: 2 THE SITE Location and Description
Page 9 and 10: Contamination 3.4 Based on the site
Page 11 and 12: 5 PRELIMINARY CONCEPTUAL SITE MODEL
Page 13 and 14: Contamination Source Contaminants a
Page 15 and 16: Laboratory Chemical Testing Soils 6
Page 17 and 18: 7 RESULTS OF THE INVESTIGATION Soil
Page 19 and 20: Natural Soils 7.7 No visual or/and
Page 21 and 22: 7.15 A further 4 gas monitoring vis
Page 23 and 24: 7.21 Of the samples of made ground
Page 25: Waste Classification 7.30 Waste cla
Page 29 and 30: Gas Protection Measures 8.13 Radon
Page 33: Appendix A Proposed Development Pla
Page 36 and 37: No. First Floor, Block C Holland Pa
Page 46 and 47: First Floor, Block C Holland Park H
Page 52 and 53: 2531 Contract no: Contract name: Cl
Page 54 and 55: Chemtech Environmental Limited SOIL
Page 60 and 61: Chemtech Environmental Limited WATE
Page 64 and 65: Chemtech Environmental Limited METH
Page 66 and 67: Chemtech Environmental Limited METH
Page 68 and 69: 2531 Contract no: 47486 Contract na
Page 74 and 75: Appendix D Laboratory Geotechnical
Page 76 and 77:
SUMMARY OF LABORATORY SOIL DESCRIPT
Page 78 and 79:
Plasticity Index (PI%). 90 80 70 60
Page 80 and 81:
Chemtech Environmental Limited SOIL
Page 82 and 83:
Appendix E Gas and Groundwater Moni
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