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Home My WebLink About2015-11-13 City Engineer Plan Review Stantec Consulting Services Inc. 2335 Highway 36 West St. Paul MN 55113 Tel: (651) 636-4600 Stantec Fax: (651) 636-1311 November 13, 2015 Mr. Eric Johnson,Administrator City of Oak Park Heights 14168 Oak Park Blvd. N., P.O. Box 2007 Oak Park Heights, MN 55082-2007 Reference: Range 082 -Plan Review Dear Eric, As requested,we have reviewed the information submitted regarding the proposed Range 082 Indoor Shooting Project. The information reviewed includes updated drawings and stormwater related documents received 11/4/2015 via email and lot split and easement documents received 11/6/2015 via email. Following are our comments and/or recommendations: Sheet C2.1- Site Plan 1. The legal descriptions for the new and vacated drainage and utility easements have been reviewed. 2. A butt joint is preferred over the proposed bituminous interlock. Revise detail and include all proposed dimensions. 3. Refer to the Fire Department review of fire lanes and circulation. Sheet C3.1 -Grading and Erosion Control 1. Refer to the comments in the attached stormwater review memo referenced below. The Owner will need to comply with all related requirements of the NPDES Construction Stormwater Permit and the Brown's Creek Watershed District. The City reserves the right to require additional erosion control measures as determined/necessary during the construction of the project. 2. Provide pavement and base section dimensions on the Trail Section on sheet C3.2 per the City's detail plate STR-39, "Typical Section for Bituminous Pathway". Provide a minimum 2-foot zone at the same grade as the trail cross slope between the trail and the ditches. Sheet C4.1- Utility Plan 1. The City or its designee will be present for water and sewer service connections at the right-of-way. 2. Calculations and drainage area maps need to be submitted for the culverts. See the attached stormwater review memo. The three new culverts will be privately owned and maintained by the Owner. Design with community in mi�d Mr.Eric Johnson Page 2 of 3 Reference: Range 082 —Plan Review 3. Include a detail showing the culvert extensions, elevations, dimensions and materials for the City culverts at the southwest corner of the project. Storm Sewer/Storm Water Management 1. See the attached stormwater review memo dated 11/11/2015 by Dan Edgerton. 2. The proposed new storm sewer facilities shall be considered private and shall be maintained by the Owner, except for the ditch within the relocated drainage and utility easement. 3. The proposed infiltration ponds are located within the City's High Vulnerability Drinking Water Supply Management Area. In order for an infiltration basin to be allowed on this site,the City will need a letter from the MPCA stating that the MPCA is willing to approve infiltration practices on this site as part of the Construction Storm Water permit for the project. In addition,if that approval is granted,there will need to be a spill response protocol identified between the City and the Owner. 4. The connection between the between the relocated ditch at the southeast corner of the project and the pond to the south of the property needs to be shown. 5. The project is subject to review by the Brown's Creek Watershed District.The City shall be provided a copy of the permit approval letter from the BCWD and any required maintenance agreements. General Comments 1. The City reserves the right to inspect the construction of the project. The City or its designee shall be present for water and sanitary sewer service connections at the right-of- way. 2. Review of issues related to parking,lighting,landscaping or the buildings is by others. 3. The Owner shall be responsible for obtaining all required permits. 4. Utility construction and improvements in the right-of-way need to conform to the City's Standard Detail Plates. The City will provide the detail plates. Design with community in mine (i). , Mr.Eric Johnson Page 3 of 3 Reference: Range 082—Plan Review If you have any questions or require further information,please do not hesitate to contact me. Regards, STANTEC CONSULTING SERVICES INC. �ZhieL'i."^ Lee M. Mann, P.E. City Engineer Phone: 651-604-4850 lee.mann@stantec.com Attachment: Range 082 -Stormwater Review cc: Andy Kegley, Public Works Director Julie Hultman, Building Official Scott Richards, City Planner Mark Vierling, City Attorney Lisa Danielson, City Arborist Design with community in mind Stantec Memo To: Lee Mann, P.E. From: Dan Edgerton, P.E. St. Paul MN Office St. Paul MN Office File: 193800151 Date: November 11, 2015 Reference: Stormwater Review: Range 082 Indoor Shooting, Oak Park Heights, MN The following is a stormwater review of the Range 082 Indoor Shooting resubmittal (10/26/2015, Project Plans including HydroCAD modeling, Elan). Summary: In general, the proposed design meets City stormwater requirements. Some additional information (highlighted in bold below) is required to finalize a stormwater review. Some specific comments: • Rate control and water quality requirements are addressed by the existing regional pond immediately to the south of the site (Pond H36-9P). • The submitted HydroCAD modeling is acceptable. The information(infiltration basin overflow elevations and high water levels) on the Grading & Erosion Control Plan does not quite match the HydroCAD modeling and should be revised as needed. • The NPDES Construction Stormwater Permit requirement of 1" of volume control from new impervious area is met with the use of two infiltration basins. Based on the submitted infiltration rate of 0.45"/hour, these basins will drain within the required 48 hours. A detail has been provided indicating that basin side slopes are no steeper than 3H:1 V. • Emergency overflows from the infiltration basins are provided to convey the 100-year storm outflow. See above comment on consistency of information between the plans and HydroCAD modeling. • The culvert design was not reviewed in detail at this time. Calculations and a drainage area map should be provided for the proposed culverts. • The drainage channel along the east edge of the site has been rerouted around the infiltration basin. Details on erosion protection as the channel enters the downstream pond need to be provided. STANTEC CONSULTING SERVICES INC. Dan Edgerton, P.E. Senior Associate Phone: (651) 604-4820 Dan.Edgerton@stantec.com Pasign w+kgammunlivif#oipaiKlak_park_heights_ci_mn\55 private\range 082 indoor shooting\resubmittal 11- 2015\review\Imm_djeA memo_151 1 1 1_range082_stormwater_review.docx Julie Hultman From: Mann, Lee <Lee.Mann@stantec.com> Sent: Friday, November 13, 2015 8:19 AM To: Eric Johnson Cc: Andrew Kegley; Scott Richards (Scott@PlanningCo.com); Mark Vierling (MVierling@eckberglammers.com);Julie Hultman; Lisa Danielson Subject: Range 082 Review Attachments: Stantec_Range082_review_2015-_11_13.pdf Eric, Attached is our review for Range 082. Let me know if you have any questions. Lee .°M. Mann, P.E, Principal Stantec • 2335 Highway 36 West St. Paul MN 55113-3819 Phone: (651) 604-4850 Cell: (651) 775-5956 Lee.Mann@stantec.com Stantec deleinoting 1,0 years of cerernunify,creativity nd clife it it-Pot-kinships; The content of this email is the confidential property of Stantec and should not be copied,modified,retransmitted,or used for any purpose except with Stantec's written authorization.If you are not the intended recipient,please delete all copies and notify us immediately. Please consider the environment before printing this email. • 1