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Mr. Dan Bott <br />-2- <br />December 15, 2003 <br />I :'tI. <br />project proponent. A Notice of Intent (NOI) with the appropriate fees for coverage of <br />the project under the General Construction Activity Storm Water Runoff Permit must be �1 <br />submitted to the State Water Resources Control Board at least 30 -days prior to the !� <br />initiation of construction activity at the site. For information, please contact Mark Smythe - <br />at (909) 782 -4998 and review the Construction Activity General Permit and Fact Sheet <br />on the SWRCB website (www.swrcb.ca.00v). <br />3. Post - development storm water runoff flow rates (Q) must not substantially differ from the <br />pre - development Q. Changes in Q, either in a positive or negative manner, can lead to <br />erosion on site or sedimentation impacts downstream from the project site. <br />4. We strongly encourage the use of pervious materials for runoff channels and 'parking <br />areas to retain absorption and allow more percolation of storm water into the ground <br />within the site. Porous pavements should be considered for use in parking areas of the <br />project as an alternative to standard impervious pavement. We encourage porous <br />pavement systems that contain an underlying stone reservoir to temporarily store <br />surface runoff and allow it to infiltrate into the subsoil. <br />5. Appropriate best management practices (BMPs) must be developed and implemented,to: <br />control the discharge of pollutants both during construction and for the life of the project. <br />Construction BMPs must address, among other things, tracking and blowing of soil <br />materials and construction debris into streets and natural and man -made -water <br />conveyances. Post - construction BMPs must address all pollutant loads carried by dry .' <br />weather runoff and first flush storm water runoff from the entire project. <br />No waste material may be discharged to any drainage areas, channels, streambeds, or' <br />streams. Spoil sites must not be located within' any streams or areas where spoil <br />material could be washed into a waterbody. BMPs must be deployed around spoils at <br />all times. No waste material may be discharged to any stormdrains or other tributaries <br />to the nearby Santa Ana River. Spoil sites must not be located where spoil material <br />could be, washed into a stormdrain. For more Information on the construction of the <br />Best Management Practices (BMPs) mentioned above, please review the EPA website <br />www.epa.gov /npdes /menuofbmps /post htri . <br />7. `' This project should be designed and constructed to protect, and if possible, improve the <br />quality of underlying groundwater. Incorporating the principles and policies mentioned <br />above will help protect the groundwater subbasin, <br />If you have any questions, contact Glenn Robertson at (909) 782 -3259, or me at (909) 782 -3234. <br />(Sincerely, Mark G. Adelson, Chief <br />Regional Planning Programs Section <br />cc: Scott Morgan — State Clearinghouse <br />Q:Planning /Groberts /Letters /CEQA/NegDec -City of Santa Ana — Geneva Commons <br />California Environmental Protection Agency <br />ea Recycled Paper <br />Page 3 of 3 <br />