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DESCRIPTION OF PROPOSED PROJECT The City of Arden Hills needs to update its policies, procedures and documentation practices to be in compliance with the newly approved Municipally Separate Storm Sewer System (MS4) permit. As part of the permit renewal, the city committed to enacting these updates within 12 months of MPCA approving the permit. In particular, we propose to assist city staff with the following: I.Reviewing and recommending updates to your storm water ordinances, including: a.Addressing site plan review requirements regarding erosion and sediment controls and waste controls. b.Post construction stormwater management that address: i.Conditions for post construction stormwater management. ii.Stormwater management limitations and exceptions. iii.Mitigation provisions. iv.Long-term maintenance of structural stormwater BMPs. II.Assisting in the development of Enforcement Response Procedures (ERPs). III.Addressing each component identified as lacking in your permit for the 6 Minimum Control Measures (MCMs). The work associated with assessing your existing MS4 program will be similar to an internal audit of the Citys SWPPP. The current rules, policies and standards will be reviewed and compared to the new MS4 permit requirements to see what changes may be required to the City SWPPP and ordinances. SCOPE OF WORK Our procedure for assisting the City of Arden Hills with its MS4 permit compliance includes the following tasks: I.Existing Stormwater Ordinance Revisions The new permit has eight (8) specific items that are required of owners/operators when developing site plans that incorporate erosion and sediment controls and waste controls into their plans. We will review the Citys existing ordinances and recommend ways to integrate these requirements. The new permit has specific limitations on runoff volume, TP loading and TSS loading for new and redevelopment projects. The permit also has limitations in the use of infiltration techniques in regards as to where these practices are located and the conditions under which they may be used. Exceptions are allowed under certain circumstances for linear projects that lack right-of-way to install volume control practices. Our assessment and recommended ordinance revisions will directly address these items. The new permit allows for off-site mitigation options when the TSS and/or TP requirements of the post-construction stormwater management criteria cannot be met. We will prepare ordinance language that addresses these permit requirements. In addition, we will use mapped GIS information to quickly map areas where infiltration practices can, and cannot be allowed.