My plan for a new pool in SoCal has a deck on 2 sides on the pool, and grass/stepping stones on the other two sides (I prefer plants to concrete). One company (30 years in business) is adamant that no-deck side should have special engineering for strength which adds cost. The other company (60 years in business) have never heard of this and says this will be regular engineering/normal pool wall. Google gives me nothing ... please help! The same first company also says that because my area code requires deck footings those are also extra. Help, I am confused!