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Part I Page No. 6 Permit No.: CO-0045225 The information gathered by this monitoring will be submitted to [hc Division by December 31, of each year. After infiltration rates have been adequately characterized, a reduction in monitoring frequency ma}' be granted. The above monitoring requirements aze summarized in the following table: Table I.B.-I Infiltration Monitoring Requirements for Points 002A, 003A (Upper & Lower Ponds), and 004A Parameter. :..: Fregiiency.:.. Depth of Precipitation, inches Estimated Initial Runoff Volume Captured in Pond, cu ft Estimated Infiltration Rate, inches/day 4 storms per yearn 0.5', plus all storms x 1.8" 4 storms per yearx 0.5', plus all storms x 1.8" 4 storms per yearx 0.5", plus all storms x 1.8" Monitoring wilt be dune during the period of May 1, thru October 3l, of each yeaz, following storms with a precipitation depth of 0.5 inches or greater, for a minimum of four storms per year, provided that at least four storms with a depth of 0.5 inches occur. All storms of a magnitude of 1.8 inches or greater will also be monitored. 2. Water Quality Sampling Water quality sampling is required far regenerative releases from the lower pond at the Ironclad Overburden Storage Area. Monitoring of the releases must be done as follows: a. Monitoring must be done on at least a monthly basis during any month when a regenerative release occurs. After sufficient characterization of the regenerative release has been accomplished, the monitoring frequency may be reduced. b. Samples shall be collected at the outfall from the lower pond, prior [o entering Squaw Gulch. Grab samples may be collected at a point in time that is approximately midway through the release. Optionally, the permittee may collect composite samples, with aliquots collected at evenly spaced intervals throughout the dischazge. pH must be measured in-situ. c. Regenerative release monitoring requirements aze summarized in the following table: Table i.B -2 for Regenerative Releases From Point 003A ,... Pazatueter Sample Type Frequency *. pH, su in-Sim /Grab Monthly TSS, mg/1 Grab /Composite Monthly Cadmium, PD, mg/I Grab /Composite Monthly Copper, PD, mg/I Grab /Composite Monthly Iron, TR, mg/I Grab /Composite Monthly Lead, PD, mg/1 Grab /Composite Monthly Zinc D. meQ Grab / Comnosite Monthly • during any month when a regenerative release occurs Based upon the results of the above sampling, additional insveam monitoring may be required in order to further assess whether or not there is a reasonable potential for water quality standazds to be violated. The procedures for determining whether or not additional monitoring is required, and for performing the monitoring, are explained below: