Every pipe a pool has runs under its deck. The skimmer line, the returns, the main drain run and the conduit to the light all leave the shell below the coping and cross to the equipment pad under the concrete, so the deck is the lid on the pool's plumbing. Taking the deck off is the one time in a pool's life those lines can be seen, tested and replaced without cutting concrete to reach them, and a deck poured over an untested line is poured over the next leak.
Katella Anaheim Concrete was opened in 2016 by Omar Espinoza, who spent 22 years on other crews first, and he is at the pool for every pour. Pools here went in with the tracts, and a pool from the 1960s or 1970s is often on its first set of lines, copper for the water and steel conduit for the light. Both corrode in damp ground, and a deck that has been replaced once already usually had its new concrete poured straight over them.
Decks are built to the California Residential Code under a CSLB C-8 concrete license, with liability insurance on every job. A deck inside the yard around a pool that already exists is a repair, but any change to the barrier, the gates or the bonding is inspected, and the deck's steel is tied into the pool's bonding grid as the California Electrical Code asks. The finished deck carries a written workmanship guarantee against defects in how it was built.