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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale - Page 15, Permit No. COG-070000 <br />RATIONALE for AMENDMENT 1 <br />CDPS GENERAL PERMIT FOR CONSTRUCTIONDEWATERING ACTIVITIES <br />CDPS NO. COG-070000, STATEWIDE COVERAGE <br />Update (April 2008) <br />This is the first amendment of the general permit for wastewater associated with construction dewatering which <br />discharge to waters of the State. <br />The most significant changes in this renewal are summarized below. <br />A. The ability of the Division to request a onetime sampling analysis for metals, as well as organics, has been <br />added. The permit writer may request the additional monitoring if information about the facility indicates the <br />potential for groundwater contamination. The Division will review the results of the requested sampling to <br />determine if additional parameters need to be added for permit limitations and monitoring in the certification. <br />Should contamination be detected based on the sampling results, the permittee will be required to instigate <br />remedial activities to become compliant with all relevant stream standards for all parameters and may be <br />required to aonly for a Groundwater Remediation Permit COG-315000. Discharge of contaminated <br />groundwater is not covered under this permit. <br />B. The monitoring frequency of total suspended solids has been changed from monthly to weekly and the monitoring <br />frequency of total dissolved solids from weekly to monthly. <br />C. The ability of the Division to change the monitoring frequencies of the specified effluent limitations has been <br />added. The monitoring frequency maybe changed based on site specific and/or discharge specific basis. <br />Maura McGovern <br />April 9, 2008 <br />PUBLIC NOTICE COMMENTS <br />No Comments were received during the Public Notice Period. <br />Maura McGovern <br />June 5, 2008 <br />Amended: June S. 2008 Effective: August 1. 2008 Expiration • November 30 <br />42011 <br />Revised 7/21/2008