This is a guess but the capped PVC on the left looks
like thin wall PVC maybe part of a French drain the other
look like drain=larger pipe vent=smaller pipe
copper with ball valve=irrigation feed
questions for you...
do you have a sump pump, is there more than just the pump
in the pit
do you have lawn sprinklers/or a pipe going into the ground
after it comes out of the house
the copper pipe to the right of the pipes in question
is that your water main