_GENERAL DOCUMENTS - C1981017 (301)

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Metal Mining SWMP Guidance Document Page 10 include a description of the results of any evaluation for the presence of discharges other than stormwater, the method used, the date of any evaluations and the on-site drainage points that were directly observed during the evaluation. A number of discharges other than stormwater may not require a CDPS Wastewater Discharge permit and are considered Allowable Non-stormwater Discharges. These are listed at Part I.D.3, below. Any of these discharges that exist at the site must be identified in the SWMP. In other words, only stormwater can be conveyed by the stormwater drainage system. Examples of potential illicit connections include the floor drains and toilets in maintenance buildings, chemical storage buildings, etc. Most illicit connections involve older buildings which were constructed when such connections may not have been prohibited. Therefore, management or tenants may have no knowledge of them. Cross-connections via broken lines or stoppages are also possible. There are several methods of determining whether or not illicit connections exist. Dry weather observations of outfalls or other appropriate locations is the most common method of determining whether or not non- stormwater discharges are occurring. Other acceptable procedures include analysis and validation of accurate piping schematics, dye tests, etc. In general, it is not anticipated that non-stormwater discharges will be a problem at most mine sites. Note - if illicit connections are discovered, corrective measures must be taken. The following paragraphs from Part I.D.3 of the permit and describe Allowable Non-stormwater Discharges. If any of these discharges exist at the site they must be identified in the SWMP. a. Except as provided in paragraph b, below, all discharges authorized by this permit shall be composed entirely of stormwater. Discharges of material other than stormwater must be addressed in a separate CDPS permit issued for that discharge. b. Discharges from the following sources that are combined with stormwater discharges associated with mining activity may be authorized by this permit, provided that the non-stormwater component of the discharge is identified in the SWMP (see Part I.A.3.d of the permit): fire fighting activities, uncontaminated natural springs, and irrigation return flow. In other words, the water being conveyed,by your storm drain system can only be composed of stormwater or runoff from fire fighting activities, unless the SWMP identifies any of the other sources of flow (uncontaminated natural springs, irrigation return flow) as being a component of it. S. Comprehensive Inspection The SWMP shall identify qualified personnel that shall inspect designated equipment and mine areas at appropriate intervals specified in the plan, at least twice a year(in the spring and fall). The operator shall keep a record of such inspections. This record shall be made available to the Division upon request and summarized in the Annual Report (see Part I.E.I of the permit).