(November 5, 2015, 1:16 PM EST) -- PITTSBURGH — A company sued for allegedly failing to perform its obligations under a contract with a hydraulic fracturing company regarding water treatment services on Nov. 4 filed a brief in Pennsylvania federal court arguing that its third-party complaint against two contractors is valid (EQT Production Company v. Terra Services LLC v. Trumbull Corporation and Environmental Construction Inc., No. 14-01053, W.D. Pa.)....