10/30/2002 Env Bd Packet - Laserfiche WebLink

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operate properly, (often due to maintenance) and (2) concerns for ground water contamination. These concerns are made greater or diminished depending on site circumstances, and must be compared to the benefits that infiltration can provide for reducing storm water flows in surface waters and replenishing ground water through recharge. Therefore, infiltration devices should be used only after thorough, site - specific evaluation of these concerns and of the pros and cons of other storm water management options. Infiltration should also be used in conjunction with other measures, such as avoidance and pretreatment practices to protect ground water quality to the maximum extent practicable, and to protect the function of the infiltration device. Sound judgment; good design, including a detailed site evaluation and proper construction techniques should alleviate the operational problems with these systems. OTHER REQUIREMENTS Class 5 Wells Under federal laws, "Class 5 wells," which are essentially any storm water infiltration device that is deeper than it is wide, are required to be inventoried by reporting to the USEPA and the MPCA. There are no other regulations at the present time, but future regulation is anticipated. Minn. R. ch. 7060 Minnesota state laws (Minn. R. ch. 7060) prohibit the direct discharge of untreated storm water to the saturated zone if the discharge threatens ground water from potential pollutants. There could be liability if it is determined that a discharge has introduced contaminants into ground water in violation of state law. Treatment before infiltration is a suggested means to discourage the possible introduction of pollutants into the ground water. Wellhead and Source Water Protection Plans For storm water systems located in defined wellhead and source water protection areas, the local unit of government must develop a "Wellhead or Source Water Protection Plan" in accordance with state laws and requirements. Special attention should be given to injection wells or infiltration basins and trenches which may pose a high risk to the wellhead, especially for drinking water wells classified by the Minnesota Department of Health as vulnerable to contamination. SUMMARY OF AUTHORITIES AND PROGRAMS In addition to the authorities listed above, many other state and local agencies have leadership responsibilities in storm water pollution control. The primary role of the involved agencies can be summarized as follows: Minnesota Pollution Control Agency Administration and Enforcement of the NPDES storm water program, including Total Maximum Daily Loads (TMDLs) • Apply effluent and water quality standards for storm water, erosion and sediment control where applicable • Adopt and provide technical assistance on acceptable technical standards and BMPs as permit requirements and as accepted tools in nonpoint source (NPS) watershed programs • Coordinate review and approval of local programs • Provide technical assistance and administrative assistance for NPS watershed projects under the Clean Water Partnership (CWP) program Urban Runoff