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Leanne Mueller -2 - 15 January 2003 _ <br /> Storm Water <br /> A NPDES General Permit for Storm Water Discharges Associated with Construction Activities, Order <br /> No. 99-28-DWQ is required when a project involves clearing, grading, disturbances to the ground, such <br /> as stockpiling, or excavation. Currently, construction activity that involves soil disturbances on — <br /> construction sites five acres or greater or which are part of a larger common plan of development or sale <br /> require a construction storm water permit. On March 10,2003 as part of the new Phase H storm water <br /> regulations, all construction activity that disturbs one acre or greater or is part of a larger common plan <br /> of development or sale will require a construction storm water permit. A Construction Activities Storm <br /> Water General Permit must be obtained prior to construction. <br /> Wetlands and/or stream course alteration <br /> If a U.S. Army Corp of Engineers (ACOE)permit is required due to the disturbance of wetlands, then <br /> Water Quality Certification must be obtained from the Regional Board prior to initiation of project <br /> activities. Section 401 of the federal Clean Water Act requires that the project proponent for any project <br /> that impacts surface waters of the United States (such as streams and wetlands)must request a 401 <br /> Water Quality Certification from the Regional Board. Water Quality Certification must be obtained prior <br /> to initiation of project activities. The proponent must follow the ACOE 404(b)(1) Guidance to assure <br /> approval of their 401 Water Quality Certification application. The guidelines are as follows: <br /> a. Avoidance (Is the project the least environmentally damaging practicable alternative?) — <br /> b. Minimization (Does the project minimize any adverse effects to the impacted wetlands?) <br /> C. Mitigation (Does the project mitigate to assure a no net loss of functional values?) <br /> Dewatering Perinit <br /> The proponent may be required to file a Dewatering Permit covered under Waste Discharge <br /> Requirements General Order for Dewatering and Other Low Threat Discharges to Surface Waters <br /> Permit, Order No. 5-00-175 (NPDES CAG995001) provided they do not contain significant quantities of <br /> pollutants and are either(1) four months or less in duration, or(2)the average dry weather discharge <br /> does not exceed 0.25 mgd: <br /> a. Well development water <br /> b. Construction dewatering <br /> C. Pump/well testing — <br /> d. Pipeline/tank pressure testing <br /> e. Pipeline/tank flushing or dewatering <br /> f. Condensate discharges — <br /> g. Water Supply system discharges <br /> h. Miscellaneous dewatering/low threat discharges <br /> If you have questions regarding the RWD process call me at(916) 255-3116; if you have questions <br /> regarding stormwater issues call Brett Stevens at(916) 255-3442 if you have questions regarding the <br /> Section 401/404 permit process call Patrick Gillum at(916)255-3397. For more information on <br /> stormwater go to the stormwater website at: htty://www.swrcb.ca.gov/stormwtr. If the project includes <br />