What measures will be in place to ensure no fungal or algae blooms will occur in the sump pit, (which will only be drained dry approximately once a year), and subsequently released to the environment?

Algae is a normal component of any ecosystem, and algae was observed in WC1 and WC3 during the fish and fish habitat assessments. Given that algae are already present in the watercourses on site, it is unlikely that algae can be prevented from entering the pit.  However, the pit itself will consist of barren rock with no nutrients or organic matter to promote algae or fungal growth, and since these species only grow in optimal ranges (stagnant water in the presence of nutrients and organics), the widespread presence of algae or fungal blooms in the pit sump is highly unlikely.