While Roxborough is famously home to numerous civil servants, especially cops and firemen, Andorra’s Lance Butler has among the most unusual city jobs. He’s growing mussels. Thousands of mussels. To place back into the Schuylkill and Delaware rivers. And it’s surprisingly important work. A senior scientist in Philadelphia Water’s Office of Watersheds, Lance was staring into a microscope last Thursday afternoon, measuring and assessing the health of baby mussels no larger than a grain of sand. He was sitting in a laboratory, what he calls “a living breathing laboratory,” tucked into the back of the Fairmount Water Works, Philly…

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