The values stored in this table indicate the two blocks which correspond to each isolation valve within the network. The relationship between the valves and blocks is strictly 2:1; that is, each valve will be associated with two blocks (i.e. There will always be one block on either side of the valve. Please note that the order (i.e. Left-right; upstream-downstream, etc.) in which these two adjacent blocks are associated with a given valve record in Table 2 does not matter. The number of records in Table 2 will be equal to the number of valve features in the network. Additionally, Table 2 must also document the unique GISOBJID (i.e. the value of the GISID field in the EAM equipment record) for each valve feature represented in the user’s GIS network.