Supporting documents - Renfrewshire Council

Goodson Associates
9.0 RECOMMENDATIONS FOR DEVELOPMENT
Proposed Store Development, Wallneuk Road, Paisley - 9692
The potential for a range of contaminants and complete pollutant linkages to
exist at the site have been identified through the preliminary investigations. An
intrusive site investigation is recommended to further characterise and refine
the conceptual site model and assess the initial risks identified. The
investigation should address the following:
§ Evaluate the presence and nature of any residual contaminants that may
be attributable to the identified historical land use.
§ Evaluate whether such contaminants are present within the surface and
sub-surface soils, the ground water regime underlying the site and;
§ Assess the extent and nature of whether any potential soil gas or vapours
are present within the soil atmosphere at this site.
The site investigation should consider the key sources and risks identified
within the preliminary CSM and provide a rationale for quantifying and
interpreting the site data obtained. It is therefore recommended that the site
investigation should comprise the following:
1. Formation of Cable Percussive Boreholes upon a sampling grid of 50
square meters across the site (Systematic Sampling) on a
commercial/industrial basis in areas where no specific contamination has
been identified and;
2. Targeted positioning of boreholes in areas of historically identified
contamination (or obvious visual signs of contamination) should enable
identification and quantification of perceived contaminants.
3. Installation of ground water monitoring wells in selected locations to
ascertain the quality and nature of the ground water regime
4. Installation of gas monitoring wells to collect and facilitate the
measurement of soil gas concentrations with regard to building/structures
and human health guidelines. Gas flow readings should also be obtained.
5. Suitable depths of advanced boreholes should be attained to effectively
assess the nature of the made ground, natural soils and underlying
groundwater, this typically should be at depths of up to 5-6m bgl.
6. Interpretation and assessment of all collected data to identify key risks and
formulation of a remediation strategy if necessary.
All site investigation works should be undertaken and adhere to current good
practice guidelines (BS 10175, BS 5930 and BS 6068) to ensure that a
comprehensive site wide investigation is conducted, and that results are
reliable and robust for recommendations to be formulated.
Page 16