Amelie Blocksidge won the 800 free by almost 10 seconds in 8:19.85, two seconds faster than her own British junior record (8:21.97) from earlier this month.
UCSC shaved more than a second off its previous record of 3:16.70 from last December, with the biggest drops coming from Kim's second leg and Dardis' anchor.
Kate Douglass, who left Worlds with 6 medals will look to keep her reign as the best swimmer in the 200 IM, while also looking to throw down in the 50 free.