_GENERAL DOCUMENTS - C1981017 (302)

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L RATIONALE - Page 5 Permit No: COG-070000 .determined by pump rate or other methods that the Division finds acceptable. The frequency of flow monitoring is discussed in the body of the permit.._ There will be no limitation on the flow volume discharged under the general permit. Flocculants Because of a wide variety of available chemical flocculants, the use of such settling aids must be subject to prior approval by the permit issuing authority. However, since lime and alum are the most frequently used aids for settling and typically their use results in no significant effect on other pollutant parameters, permission for their use will not be required. Salinity Salinity, Total Dissolved Solids (TDS) is an issue in the Colorado River Basin which warrants some discussion. Regulation 3.10.0, Regulations for Implementation of the Colorado River Salinity Standards Through the Colorado Discharge Permit Program addresses the discharge of salinity to the Colorado River Basin. It is a requirement of the regulation that the salinity of each discharge in the Colorado River Basin be evaluated for impact on the system. Generally, the net impact on salinity to the basin from construction dewatering is negligible because the waters are typically shallow groundwaters which eventually reach the river. Nonetheless, the state reserves the right to refuse the applicability under the general discharge permit of any construction dewatering operation, if it appears that the discharge will not be consistent with regulations. Additionally, quarterly monitoring for salinity will be a permit requirement for all facilities located in the Colorado River Basin. Should the data identify a problem, the state will have the right to require the facility to obtain an individual permit, whereby a study addressing the economic feasibility of salt removal can be required. The certification rationale that accompanies the permit shall include the Division's determination of whether or not salinity monitoring is required. Monitoring Requirements Monitoring will be required of each activity resulting in a discharge. The monitoring frequencies are stated on page 5 of the permit. Because most discharges are of short duration, frequent monitoring is necessary to determine changes in the quality of the discharge. Spill Containment As most facilities provide bulk storage of some volume of petroleum products or other chemicals, the permit will require adequate protection from spills for such facilities so as to prevent loss of these materials into discharged waters. Such protection can take various forms, however diking in most cases will prove to be the most cost effective. This provision is required as the Division interprets proper operation, as properly addressing potential _ pollutant sources before problems occur.