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PART <br />Page 6 <br />Permit No. COG - 603000 <br />b. Table 2— Effluent Limitations and Monitoring Requirements for continuous discharges (i.e. subsurface structure (foundation) <br />dewatering of groundwater). <br />Effluent Parameter Discharge Limitations Monitoring Sample Type <br />30 Day Avg 7 Day Avg Daily Max Frequency <br />Flow, gpm Report NA Report Monthly Recorder <br />Total Suspended Solids, mg/1 30 45 NA Monthly Grab <br />pH, s.u. NA NA 6.5 -9.0 Monthly In -situ <br />Oil and Grease, mg /13 NA NA 10 Monthly Visual/Grab <br />Site specific <br />Other Pollutants, units Limit NA Limit Monthly Grab <br />Other Pollutants, units Report NA Report Monthly Grab <br />Total Dissolved Solids, mg/l Report NA Report Quarterly Grab <br />Total Phosphorus, mg/F 0.05 NA 0.05 Monthly Grab <br />Total Phosphorus, mg/1 Report NA Report Monthly Grab <br />This monitoring frequency is based on discharges that are classified as intermittent or temporary, such as those surrounding well <br />development or subterranean dewatering activities. If the discharge is not classified as intermittent or temporary, the monitoring frequency <br />may be changed. <br />z Flow can be measured with a recorder or determined from estimates based on measurements of pump capacity or flow over timed intervals <br />whichever' represents existing conditions. <br />3 There shall be no visible sheen. If a visual sheen is detected a grab sample must be taken. <br />J Monitoring is required only for discharges within the Colorado River Basin. <br />5 If the receiving water body is subject to a control regulation, then a limit and/or monitoring may be required for this controlled parameter <br />b. Water Quality Standards – Site - specific limitations for additional parameters will be added on a case -by -case basis that <br />are equivalent to the water quality standards found in The Basic Standards and Methodologies for Surface Water (5 <br />CCR 1002 -31) or The Basic Standards for Ground Water (5 CCR 1002 -41), as appropriate, and will be specified in the <br />certification along with appropriate monitoring frequencies. <br />c. Chemical Addition – All chemicals that are or may be in the discharge are subject to review and approval. A Material <br />Safety Data Sheet (MSDS) showing aquatic toxicity data shall be submitted with the permit application. The permit <br />writer will review the MSDS and any other applicable information prior to approval. If additional pollutants may be <br />discharged as a result of the chemical addition, limitations and /or monitoring may be added to those in the table above to <br />assure constituents in the chemicals do not violate water quality standards. <br />d. Volume of Water Discharged (Flow) – Flow reporting will apply. See the individual certification rationale for the flow <br />limit applicable to the facility. Either a flow measuring device or an approved alternate determination of the total volume <br />and total time of discharge may be used for effluent flow monitoring. Also see Part I.E.5. of this permit. <br />e. Salinity Monitoring – In compliance with the Colorado River Salinity Standards (Regulation No. 39) and the Colorado <br />Discharge Permit System Regulations (Regulation No. 61), all permittees in the Colorado River basin shall monitor for total <br />dissolved solids (TDS). Samples shall be taken at all authorized outfalls. If TDS monitoring is a requirement of the permit <br />then it shall be included in the site - specific certification. Additional monitoring for TDS shall be included on the DMR and <br />shall be subject to the permit's monitoring and reporting requirements. TDS sampling shall be taken as a grab sample. <br />f. Control Regulations— Control regulations exist to place additional limits on discharges to surface waters in five <br />watersheds – Dillon Reservoir, Cherry Creek Reservoir, Chatfield Reservoir, Cheraw Lake, and Bear Creek Reservoir. <br />The total available wasteloads (i.e., phosphorus) have been allocated in these regulations to various point and non -point <br />sources that discharge on these watersheds. Certifications for discharges to these watersheds may include limitations <br />and /or monitoring requirements for the parameters specified in the regulation. <br />g. Discharges to 303(d) listed waters – Since the effluent limits are equal to the water - quality standards and the discharge is <br />expected to be short-term or intermittent, the assumption is that the discharge will not further impair the quality of the <br />receiving water for the 303(d)- listed parameters. <br />h. Discharging to Ground Water – Facilities permitted under this general permit may discharge to ground water via land <br />application, infiltration ponds or other approved means. Because the standards for groundwater are based on water supply <br />and agricultural uses, which also apply to surface waters of the state, the Division has determined that discharges that are <br />protective of surface water standards are also protective of groundwater standards, unless a more stringent site - specific <br />groundwater standard has been adopted. The Division will include a site - specific limit in the certification or require <br />