GIS Mapping and GPS Survey for ALCOSAN's Wastewater Treatment Plant and Conveyance System

ALCOSAN operates the interceptor sewers and treatment plant for most of the metropolitan area surrounding the City of Pittsburgh. Chester Engineers designed and implemented the GIS portion of an automated operations and maintenance manual at the ALCOSAN treatment plant. Our services in regard to this project included the completion of a functional analysis of user needs, database design, land base design and mapping, GPS surveys, records research and inventory, and data conversion of existing drawings. Chester Engineers also developed custom interfaces for various types of users, ranging from senior managers to operations and line maintenance staff. Using the Avenue programming language, Chester Engineers developed interfaces for ArcView software that are tailored specifically to user needs. In a separate project, Chester Engineers completed GPS mapping and GIS conversion of ALCOSAN's interceptor sewer system. Chester Engineers performed GPS surveys to capture the locations of all manholes and diversion structures. Interceptor sewer pipeline data was converted from as-built drawings and integrated into the GPS survey data. All of the converted data was registered to the Allegheny County GIS land base. A photographic inventory of all diversion structures was assembled and linked to the feature database within the GIS. A total of 1,200 manhole and diversion structure points were captured and mapped using GPS and roughly 475,000 feet of interceptor sewer were mapped into the GIS.

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