I think you may find it shorter/quicker to go via Fuente Alamo. From Condado head towards Mazarron and take exit signed Fuents Alamo (the dog bone roundabout).
Follow this road, think it is the 602, pass the Tanatorio on your left and take next turnoff signed Balsapintada.
At roundabout take Balsapintada exit. It is then pretty well a straight road to the C3319. You will go through Balsapintada, over the A30, then either take the new road to bypass Roldan or keep on minor road through the middle of Roldan. Somewhere along the road you will start to see signs for Balsicas - follow these as this is the town where you join the C3319.
After Roldan keep on road pass the big industrial estate on the left and join the C3319 direction San Javier. I believe PW offices are the 2nd exit.
If you trace it through on a map you will see it is straight foward even if des sound a bit complicated.
Jean