Mealey's (October 10, 2016, 10:11 AM EDT) -- HARRISBURG, Pa. — The hydraulic fracturing company and its affiliates being sued by residents who allege that the companies contaminated the groundwater in their Pennsylvania town filed an amendment to a settlement agreement between the parties on Sept. 30, which releases two of the plaintiff couples from any liability (Tammy Manning, et al. v. WPX Energy Appalachia LLC, No. 12-0646, M.D. Pa.)....