ETOWAH, Tenn. (AP) - Waupaca Foundry will permanently lay off 113 employees because of a slowdown in the automotive marketplace. The layoffs, effective Aug. 30, will reduce the plant's workforce from 505 workers to 392, The Daily Post-Athenian of Athens reported on its Web site. Established in 2001, the foundry manufactures ductile iron castings used for the production of brake calipers, brake supports and…