CHEM SERVICE, INC., APPELLANT, v. ENVIRONMENTAL MONITORING SYSTEMS LABORATORY-CINCINNATI OF THE UNITED STATES ENVIRONMENTAL PrOTECTION AGENCY; THOMAS A. CLARK, IN HIS CAPACITY AS DIRECTOR OF THE ENVIRONMENTAL MONITORING SYSTEMS LABORATORY-CINCINNATI OF THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY; UNITED STATES ENVIRONMENTAL PROTECTION AGENCY; NSI ENVIRONMENTAL SOLUTIONS, INC. No. 93-1196.United States Court of Appeals, Third Circuit.Argued September […]