def _write(self, session, openFile, replaceParamFile=None, writeIndexMaps=True):
        """
        Map Table Write to File Method
        """
        # Extract directory
        directory = os.path.split(openFile.name)[0]

        # Derive a Unique Set of Contaminants
        for mapTable in self.getOrderedMapTables(session):
            if mapTable.name == 'CONTAMINANT_TRANSPORT':
                contaminantList = []
                for mtValue in mapTable.values:
                    if mtValue.contaminant not in contaminantList:
                        contaminantList.append(mtValue.contaminant)

                contaminants = sorted(contaminantList, key=lambda x: (x.indexMap.name, x.name))

        # Write first line to file
        openFile.write('GSSHA_INDEX_MAP_TABLES\n')

        # Write list of index maps
        for indexMap in self.indexMaps:
            # Write to map table file
            openFile.write('INDEX_MAP%s"%s" "%s"\n' % (' ' * 16, indexMap.filename, indexMap.name))

            if writeIndexMaps:
                # Initiate index map write
                indexMap.write(directory, session=session)

        for mapTable in self.getOrderedMapTables(session):
            if mapTable.name == 'SEDIMENTS':
                self._writeSedimentTable(session=session,
                                         fileObject=openFile,
                                         mapTable=mapTable,
                                         replaceParamFile=replaceParamFile)
            elif mapTable.name == 'CONTAMINANT_TRANSPORT':
                self._writeContaminantTable(session=session,
                                            fileObject=openFile,
                                            mapTable=mapTable,
                                            contaminants=contaminants,
                                            replaceParamFile=replaceParamFile)
            else:
                self._writeMapTable(session=session,
                                    fileObject=openFile,
                                    mapTable=mapTable,
                                    replaceParamFile=replaceParamFile)