This is a Corian 850 integral sink. The sink has a crack you can barely see with your eye but it is leaking. The homeowners chose to retro fit an undermount stainless steel sink as the replacement.
It is being replaced with a Kraus 16 ga zero radius sink. People are really loving those.
Okay. Here is a better view looking down into a Kraus sink. Different job but same Kraus sink.
Replacing a Corian 850 Sink With a Stainless Steel Undermount in Huntersville NC by Complete Solid Surface Refinishing. Bryan Dix