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701 Xenia Avenue South | Suite 300 | Minneapolis, MN 55416 | (763) 541-4800 <br /> <br />Building a legacy – your legacy. <br />Equal Opportunity Employer | wsbeng.com <br />K:\03455-000\Admin\Docs\Plan Reviews\2017-12-07 Horita Acres\3455-000 Horita Acres Review Submittal 171207.docx <br /> <br />Memorandum <br /> <br />To: Sue Polka – Arden Hills Public Works Director / City Engineer <br /> <br />From: Matt Schulz – WSB <br /> <br />Date: December 7, 2017 <br /> <br />Re: Horita Acres <br /> Stormwater Review Comments <br /> WSB Project No. 03455-000 <br /> <br /> <br /> <br />WSB has reviewed the documents provided by Pioneer Engineering P.A. on 12/04/17 for the Horita Acres <br />Project. Documents reviewed include: <br /> <br />· Storm Water Management Plan dated 11/03/17, Revised 11/29/17 <br />· Full Plan Set Dated 11/08/17 <br /> <br />We offer the following comments based on review of the above documents. <br /> <br />1. General <br />a. Please note, a permit will need obtained from the Rice Creek Watershed District (RCWD) <br />for Rule D and Rule F. Additional RCWD Rules may apply. Verify with RCWD as <br />necessary. <br />b. Provide a maintenance agreement to ensure that the BMPs will be inspected and <br />maintained long term. The agreement at a minimum shall include the following: <br />i. Who will conduct maintenance <br />ii. Inspection frequency. <br />iii. Maintenance necessary to ensure effective performance. <br />iv. Maintenance intervals. <br />v. Removal of settled materials. <br />vi. Maintenance of vegetation. <br />2. Plat <br />a. Drainage easements shall be at least twelve feet wide per City Code 1130.05. Drainage <br />easement to the north of lot two is shown as a 10’ easement. Please revise. <br />b. Ponding easements shall be taken to two feet above the emergency overflow elevation <br />per City Code 1130.05. On this site that equates to elevation 891.00 around Pond 1 and <br />889.00 around Pond 2. Easement line around ponding areas appear to be lower that this <br />elevation on the proposed grading plan. Please revise. <br /> <br />3. Storm Water Management Plan (SWMP) <br />a. The drainage areas listed in Table in section III.A of the SWMP do not match the <br />drainage areas in the HydroCAD report. Please correct the discrepancy or explain the <br />difference. Example, 1.636 acres total in HydroCAD and 1.879 acres total in table. This <br />comment was also made on previous submittal. <br />b. The site appears to receive off site drainage from New Brighton Road and Thom Drive <br />based on the existing contours in the drainage area maps. Please verify and revise the <br />proposed and existing drainage areas as necessary to account for all offsite drainage <br />tributary to the site and Pond 1. This comment was also made on previous submittal.