If attempting one or both of the stormwater management credits SSc6.1 and SSc6.2 confirm with the contractor that the SWPPP accurately represents the hydrologic characteristics of the site and is performing as anticipated. Check on assumed infiltration rates, suspected rate and quantity of run-off to receiving streams, and discuss potential storage options. Make changes to the stormwater management system accordingly to improve its effectiveness and ensure that the credit calculations are accurate.