I've created the paragraph below and am quite confused if I should use 'has been or 'have been'. Also, should I use 'in consultation' or 'consultations' in this paragraph?
Referencing of SKM plans and consultations with Humes and G-MW’s 'Construction' have been conducted for the investigation of this box culvert’s design and construction methodology; the investigation included the analysis to find the best backfill, base preparation and jointing method to maximise the life of box culvert road crossings.
Thank you :)
Probably lost the plot here