01-22-2013 Planning Commission Packet

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Site Plan Review Application 13-3589 JEM Technical Page 2 3.0 Grading and Draina e�Plan: 3.1) The applicant will be required to obtain a Minnehaha Creek Watershed District(MCWD) pernut for the proposed work. The Stormwater Management Plan and Stormwater Pollution Prevention Plan must be submitted to MCWD for their review and approval. Redevelopment sites greater than 1 acre with less than 40% site disturbance and less than a 50%increase in impervious surface must provide phosphorus control,rate control,and volume control for the additional impervious surface. A copy of the permit should be submitted to the City prior to any land disturbing activities. 3.2) It appears that more than 1 acre will be disturbed with the proposed improvements. Therefore,a NPDES/SDS General Stormwater Permit for Construction Activity will be required,and a copy should be submitted to the City prior to any land altering activities. 3.3) The proposed storm sewer should be shown on the Grading Plan to indicate direction of drainage. 4.0 SWPPP: 4.1) The rock construction entrance location should be shown on the plan. 4.2) The proposed storm sewer should be shown on the SWPPP to indicate direction of drainage. 4.3) Siltfence should be added at the proposed 12"flared-end section,with ends directed upslope. 4.4) Note 11 indicates a designated concrete washout location should be shown on the plan. If a concrete washout is to be allowed on site,the location should be indicated on the plan,and a detail should be added. The detail should include dimensions and containment and removal procedures 5.0 Utility Plan: 5.1) The applicant should consider upsizing the outlet from the truck dock trench drain to 6"or greater in order to minimize the chance of clogging. 5.2) A detail for the proposed trench drain at the underground entrance should be added. The detail should include elevations,dimensions,and materials. 5.3) A concrete headwall with a rodent guazd should be added to the truck dock trench drain outlet. 5.4) The catchbasin manhole detail indicates a structure number of 100,but the catchbasin in the proposed parking lot is labeled 101. The numbering should be revised to be consistent between detail and plan view. 5.5) A note neaz CBMH#101 indicates 52LF of 12"RCP @ 0.50% to be installed, but no pipe is graphically indicated. If no pipe is to be installed in this location,the note should be removed. 5.6) An appropriate amount of MnDOT Class 3 riprap should be installed at the proposed 12" flazed-end section for energy dissipation. A note should be added to call out quantity,and a detail should be added to indicate proper installation.