Thank you everyone for voting! Here's what became of the concept:
Port Promise semi-legal landfill
https://64.media.tumblr.com/8d002e78bf4688f4e8462dc048503a76/5455f240503e4748-e2/s500x750/5d38be1c6353dd511aad95fe5fc46d17158f8499.png
https://64.media.tumblr.com/39c249ad3d1d0770c98a2e3f273ec7fc/5455f240503e4748-94/s500x750/9194a78375db35fb0cbf2cbee33ff94e0964b230.png
https://64.media.tumblr.com/6474000502f3516d00a197d33630b9e8/5455f240503e4748-ca/s500x750/df97593b4cfa130e75e3d2393e3c076ad5c03d5b.png
The water reservoir with the toxic waste will become a public swimming pool.
And the protagonists
https://64.media.tumblr.com/e0dfead5b6bbeebe2acd4192725f8a90/18154a1384e664a2-10/s2048x3072/6c52616004682d014111e6e11dccfdc12a25fe04.png
Sophie
A household android that got replaced by a newer model. Sophie never got over the betrayal and now wants to kill her successor.
Said successor is one of my favorite sims. Sophie might meet him, but I won't let her kill Daniel.
https://64.media.tumblr.com/d275e1248c1f905886d183f1832b3601/d3fad0d8a50ab488-dc/s2048x3072/62e4a2072cdbe9084e5bad1108a3ff7e8e189d6f.png
Carter
The seventh in a line of detective android prototypes. I'm looking forward to him running into his identically looking sucessors randomly (or not so randomly), because he is so different from both of them: Carter "7" is down to earth and casually uses explicit language, Connor "8" is very proper and Amadeus "9" is a squemish, snobbish, lazy hedonist.
https://abload.de/img/27.11.23_21-57-56ftiny.png
Dave
As a frogman Dave undertook regular dives in the port to check for safety hazards, search lost objects or evidence disposed by criminals. One day he saw something that wasn't to surface again and subsequently got sabotaged, but survived.
https://64.media.tumblr.com/11cfacd01d508992a0675e85bcc86f3d/ebe7a65c6449042b-6e/s2048x3072/c477e883d5e9de1a6b47ca6e6d34008372b1ffc6.png
Judith
Modeled after the famous actress Judith Ward in her prime, this android got discarded by her owners when Judith wasn't "in" anymore. She starts out with stereotypical celebrity traits and her arc revolves around developing a personality of her own.