Table 5.1: Tabulated Conceptual Site Model (S-P-R linkages) Known and Impacted Contaminants Exposure Receptors Comments Potential Media of Concern Route Current Future Sources (Pathway) Identified Soil Lead and PAHs Excavation Site Workers. Residents. Excavation work within areas of contaminants work resulting identified contamination (outside of within southern in direct contact Residents. Recreation existing embankment footprint) is portion of St and dust ground users. constrained to removal of topsoil Asaph Common creation or Recreation (shallow excavation to approx. 0.1m) to (east and west increased ground users. Surface water. enable placement of additional banks) leaching from embankment fill. Excavation is not deep soil within Surface Water. enough to encounter identified excavations. contamination or to create any new pathways for exposure e.g. leaching. Currently Soil Non currently Excavation Site Workers. Residents. Areas of excavation (outside of the unidentified identified work resulting existing embankments which comprise contamination with in direct contact Residents. Recreation engineering fill) are limited to 1m deep areas of ground and dust ground users. excavations within BT land. No excavation work creation or Recreation contamination has been identified within (BT land) increased ground users. Surface water. this location during extensive trial leaching from trenching and GI work; therefore, the soil within Surface Water. risk of encountering unknown excavations. contamination in this area is very low. Currently Soil Non currently Piling work has Groundwater. Groundwater. No piling work proposed within any unidentified identified the potential to areas of known or identified contamination with create new Surface water Surface water contamination. areas made ground pathways where recharged where recharged Extensive GI work has been undertaken throughout between by groundwater. by groundwater. throughout the scheme area; therefore, it Scheme area shallow made is anticipated that the risk of piling work ground and resulting in the creation of preferential deeper ground pathways between unknown or groundwater contamination within shallow made below.
Table 5.1: Tabulated Conceptual Site Model (S-P-R linkages) Known and Potential Sources Impacted Media Contaminants of Concern Exposure Route (Pathway) Receptors Comments Current Future Identified contaminants within southern portion of St Asaph Common (east and west banks) Soil Lead and PAHs Excavation work resulting in direct contact and dust creation or increased leaching from soil within excavations. Site Workers. Residents. Recreation ground users. Surface Water. Residents. Recreation ground users. Surface water. Excavation work within areas of identified contamination (outside of existing embankment footprint) is constrained to removal of topsoil (shallow excavation to approx. 0.1m) to enable placement of additional embankment fill. Excavation is not deep enough to encounter identified contamination or to create any new pathways for exposure e.g. leaching. Currently unidentified contamination with areas of ground excavation work (BT land) Soil Non currently identified Excavation work resulting in direct contact and dust creation or increased leaching from soil within excavations. Site Workers. Residents. Recreation ground users. Surface Water. Residents. Recreation ground users. Surface water. Areas of excavation (outside of the existing embankments which comprise engineering fill) are limited to 1m deep excavations within BT land. No contamination has been identified within this location during extensive trial trenching and GI work; therefore, the risk of encountering unknown contamination in this area is very low. Currently unidentified contamination with areas made ground throughout Scheme area Soil Non currently identified Piling work has the potential to create new pathways between shallow made ground and deeper ground or groundwater below. Groundwater. Surface water where recharged by groundwater. Groundwater. Surface water where recharged by groundwater. No piling work proposed within any areas of known or identified contamination. Extensive GI work has been undertaken throughout the scheme area; therefore, it is anticipated that the risk of piling work resulting in the creation of preferential pathways between unknown contamination within shallow made
122488-bvl-z0-pb-rp-v-00004.docx