2018-10-22_REVISION - M2008078 (14)

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is based on the Determination of the Requirement to Include Water Quality Standards-Based Limits in CDPS Permits Based on Reasonable Potential, dated December, 2002. All reported data was below the domestic water supply chronic standard (for dissolved uranium)of 30 mg/l, however the highest reported value, 23.4 mg/t is greater than half of the standard, and therefore, site-specific sampling and reporting for total recoverable uranium is required. BASIS FOR STORMWATER MONITORING As provided by Part 1.1 of the permit, the permittee must monitor stormwater discharges from industrial activities conducted at the facility. Parts 1.1.1 through 1.1.4 of the permit identify the types of required monitoring, one or more of which may apply to the discharge authorized by the stormwater permit as identified in the enclosed permit certification for the permitted facility. • Visual Monitoring: Part 1.1.1 of the stormwater discharge permit requires that the permittee perform quarterly visual monitoring on stormwater-only discharges from the industrial activities conducted at the facility. • Site specific parameters: Segment 01c of the Lower Arkansas Sub-basin,Arkansas Basin is listed as impaired (Regulation No. 93)for dissolved selenium, total recoverable uranium, and dissolved manganese in accordance with Section 303(d)of the federal Clean Water Act. The Division has not yet developed a TMDL for dissolved selenium, total recoverable uranium, and dissolved manganese for this segment. These parameters have the potential to be in discharges from the West Faun Pit facility based on a qualitative reasonable potential determination that sand and gravel and other earth materials at the facility are potential sources of selenium, manganese, and uranium.Therefore, site-specific water quality based effluent sampling and reporting for dissolved selenium, total recoverable uranium, and dissolved manganese is required. FEE INFORMATION (V-A 270) The Annual Fee for this certification is$270 (category 07, Subcategory V-A-Sand and gravel with process discharge and stormwater,per CRS 25-8-502). Do Not Pay This Now. Annual fees are sent to the legal or billing contact in July. GENERAL INFORMATION • Changes to the certification:Any changes that need to be made to the certification page-changes in sampling location, monitoring requirements, etc., must be submitted using the"Permit and Certification Modification form"available on the Division's website, www.coloradowaterpermits.com, and signed by the legal contact. • Flow Monitoring Frequency: The application did not specify whether the permittee uses'continuous' or 'instantaneous' flow measurement. If power is not available, flow may be measured on an instantaneous basis. If this is the condition at the facility, the permittee may submit a modification request to the division to change the flow measurement technique to 'instantaneous'. • Monitoring and requirements: Monitoring must occur at the frequency established in the permit certification. Weather conditions may not always allow the permittee to collect a sample during business hours; however,the monitoring frequency established in the permit certification must be met. For facilities required to conduct chemical monitoring, the Division strongly recommends that the permittee contact a lab prior to setting up a sampling program. Process water sampling shall occur at a point after treatment,or after the implementation of any control measures. If control measures or treatment are not implemented, sampling shall occur where the discharge leaves control of the permittee, and prior to entering the receiving stream. Samples must be representative of what is entering the receiving stream. Stormwater monitoring location(s), i.e., outfalls, are locations where stormwater exits the facility property, including pipes, ditches, swates, sheet flow and other structures that transport stormwater. The permittee must modify the facility SWMP to include a description of all stormwater outfalls. Stormwater outfalls must be representative of the facility's stormwater discharge.A facility may require more than one stormwater outfalt where pollutant sources vary across the facility. • Discharge Monitoring Reports (DMRs): DMRs will be mailed or emailed approximately one month following certification issuance. DMRs must be submitted quarterly as long as the certification is in effect. If the permittee, using an approved analytical method, monitors any parameter more frequently than required by this Fact sheet Page 3 of 5 I 4300 Cherry Creek Drive S.,Denver,CO 80246-1 5 30 P 303-692-2000 www.colorado.gov/cdphe/wgcd John W. Hickentooper.Governor I Larry Wotk,MD,MSPH,Executive Director and Chief Medical Officer A