Beal Valley SPZ Area


Enzygo was commissioned by Casey Group Limited (CG) was to produce a Hydrogeological Risk Assessment (HRA) on the 14 hectare Beal Valley Site. The boundary of this site is defined by the intersection of the Source Protection Zone (SPZ) and the proposed Beal Valley Golf Course (which has been under construction since 1994).

CG wanted to asses the groundwater contamination risk from emplaced fill material used to raise the golf course levels. Enzygo reviewed the local and regional geology, hydrology and hydrogeology to determine credible risk assessment model pathways and receptors.

Challenges We Faced
Although the site had previously been given a waste management licence for a landfill to be created alongside the golf course, there were political changes that occurred leading to the construction of the landfill site not being completed. Legislation was bought in during 2011 which prevented the emplacement of waste/fill material within the SPZ area. The challenge Enzygo faced was to prove that the waste/fill material which had already been emplaced in the SPZ by CG did not pose a significant contamination risk to the groundwater within the SPZ. The SPZ covers the whole Beal Valley catchment and contains a major United Utilities public water supply abstraction point at Milnrow (to the north of the site).

What We Did
Enzygo utilised their previous HRA experience to identify contamination sources and receptors. Groundwater monitoring data form the site and adjacent River Beal was reviewed in order to determine baseline values, which were then compared to soil leachate samples data.

What We Achieved
By reviewing previous reports and data, and constructing a new CSM for the site, Enzygo was able to demonstrate that the previously-emplaced waste inside the SPZ boundary posed no contaminative risk to the SPZ or the abstraction point at Milnrow.