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COLORADO DEPARTMENT OF PUBLIC HEALTH AND THE ENV/RONMEM, Water Quality Control Division Rationale -Page 13, Pennit No. CO-0045225 b. Samples shall be collected at the outfall from the lower pond, prior to entering Squaw Gulch. Grab samples may be collected at a poin! in tune that is approximately midway Through the release. Optionally, the permittee may collect composite samples, with aliquots collected at evenly spaced intervals throughout the discharge. c. Samples that are collected will be analyzed for the parameters shown in Table V/-2. Table V/-2 Monitoring Requiremems jot Regenerative Releases From Point 003A Parameter Sample Type: Frequency *.: ;,. pH, su In-Situ 1 Grab Monthly TSS, mg/l Grab /Composite Monthly Cadmium, PD, tng/1 Grab /Composite Monthly Copper, PD, rng/! Grab /Composite Monthly /ton, TR, mg/l Grab /Composite Monthly Lead, PD, mg/l Grab /Composite Mamhly Zinc. PD me/1 Grab /Composite Monthly • During any month when a regenerative release occurs. Based upon the results of the above sampling, additional instream monitoring may 6e required in order to further assess whether or nor there is a reasonable potential jot water quality standards to be violated. The procedures for determining w/:ether or not additional monitoring is required, and jot performing the monitoring, are exptained below: d. Tne permiaee shall compare sample resulu against the following calculated release concentrations. Table VI-3 Calculated Release Concemrarions ,...,;:::.:.: arrSmeter«.,,~~,:;~: .~,.;:;;'~:<<sN:;z~;o:~~,:~.~,~~,.,,.:::Yiflno;'ai.::,,~-,.::..:<..:. . pH, su 6.5-9.0 Cadmium (PD), mg/1 0.016 Copper (PD), mg/! 0.037 Lead (PD), mg/1 0.33 Zinc (PD), mgt( 0.33 From Issuance Tltru 12/31 /97 /ton (/72), mg/I 11.4 Beginning I/1/98 Iron m /I 4.6 If any individual sample result is greater than (or, in the case of pH -less than) the calculated release concentration, the permittee will visually track the next subsequent regenerative release from the lower pond down the Squaw Gulch drainage and perform the following analyses: i) If the discharge is tracked all the way into Cripple Creek, both an upstream and downstream sample will be collected within Cripple Creek. Upstream samples jot all parameters lts[ed in Table VI-2 will 6e collected immediately upstream of the confluence. Downstream samples will be collected at the first downstream point where the two streams have become completely mixed. ii) 1f the discharge infiltrates prior to reaching the Highway 67 crossing, no junher monitoring is required.