(a) Water treatment residuals that are land applied shall be monitored for the metals listed in Table 1 of §312.43(b)(1) of this title (relating to Metal Limits) at the frequency specified in Table 10 of this subsection.Attached Graphic(b) After the water treatment residuals have been monitored for two years at the frequency shown in Table 10 of subsection (a) of this section, the executive director may reduce the monitoring frequency, but in no case shall the monitoring frequency be less than once per year when water treatment residuals are land applied. A request to reduce monitoring frequency must be submitted to the executive director with the sample results from the previous two years.(c) After the water treatment residuals have been monitored for two years at the frequency shown in Table 10 of subsection (a) of this section, the executive director may increase the monitoring frequency. An increase in monitoring frequency will be required where high metal concentrations are present in the water treatment residuals.