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Home My WebLink AboutEroson Control letter . og,o�,o , . � �r��. _ � •�� Bonestroo ��x � y.��- � ,,�t H�n,,,.w:��.�o�,,. �\�9kEsxo�;; November 13, 2009 Jasin Larson 3485 Crystal Place Wayzata MN 55391 RE: Permit 2009-00258 - 3485 Crystal Place The active summer construction season is fast drawing to a close here in the state of winter and frozen ground. As we move into a new season it is important we take the proper precautions on our active sites to help eliminate any erosion problems or added expenses that may be incurred due to winter freeae thaw events and the inevitable spring runoff. As construction continues throughout the winter in tbe City of Orono it is important to minimize the amount of open soil by providing temporary or permanent cover, one of the key elements in preventing soil loss. It is also required that the appropriate BMPs be maintained on-site by December l, 2009 as follows: ■ Exposed soil areas must be stabilized with the appropriate seed mix and erosion control blanket, disc anchored mulch applied at a rate of 2 tons per acre ar other effective means to control erosion. o Areas requiring stabilization will include but are not limited to small miscellaneous areas, landscaping areas, sidewalk backfill,non-active stockpiles, finished grading areas, etc. o Areas being worked after November 26th must be stabilized weekly until construction ends. o In the event that it snows and there are frozen ground conditions,mulch can be applied effectively over the snow. ■ Seeding must be completed with the appropriate seed mix as indicated below. Dormant seeding shall be done in the later fall after the soil temperature is consistently below 50 degrees Fahrenheit. Seeding done before or after the indicated seed dates may require reseeding if the seed does not take. In the event that it snows and there are frozen ground conditions, seed can be applied effectively over the snow. Fall and Dormant Seedina Dates Seed Mixture Number Fall Dormant Seedin 100 Aug. 1 —Oct. 1 Oct 20—Dec. 1 150, 190 July 20—Oct. Oct. 20 -Dec. 1 20 240,250,260,270 July 20— Sept. Oct. 20—Dec. 1 �p 310, 325,328, 330, Sept. 20—Oct. Oct. 20—Dec. 1 340,350 20 ■ Rock construction entrances to access the construction site and prevent tracking sediment off site ■ Silt fence or an approved perimeter control device shall be installed to control runoff ■ Soil stockpiles should be eliminated or consolidated to the extent as possible and be protected with perimeter control and mulch applied on all stockpiles that will remain dormant for the winter months. ■ Storm Sewer inlet protection including curb and b tter catch basins,parking lot/road drains, and backyard drop inlets must be: o Maintained in a manner where all removal of sediment and debris, repairs as • necessary, and or replacement are completed by November 26`�', 2009. Sediment shall be removed when occupying greater than 1/3 the volume of the device, placed in an � upland area and stabilized. o All"in-structure" and"on-structure devices shall be removed from the storm sewer inlets by November 26`�', 2009 and re-installed in the storm sewer inlets by April 1, 2010. BMP installation, such as silt fence, has a tendency to be more costly to install during the winter months therefore it is recommended that all installation occur prior to the ground freezing on sites where work is proposed to be done during the winter months. Regular construction site inspection will occur throughout the winter months, and compliance with the Minnesota Pollution Control Agency(MPCA) construction site general permit and the City Land Disturbance Permit will be expected. If you have any questions regarding these construction site winterization issues,please feel free to contact me at 651-325-6860. Thank you for your cooperation in preserving the surrounding natural resources within the City of Orono. Chad Johnson, CPESC Tel 651-604-4939 Cell 651-325-6860 chad.johnson@bonestroo.com +�� .- ,..__�..�� 2335 Highway 36 W St. Paul, MN 55113 Tel 651-636-4600 Fax 651-636-1311 www.bonestroo.com ,. Summary of Erosion and Sediment Control Compliance on Sites after Receiving the Winterization Letter. 1. 4701 West Branch Road. No functioning perimeter protection on site, all open soil should be enclosed with perimeter protection. 2. 3127 Casco Circle. Perimeter protection is in place and functioning properly, there was open soil on site but it is considered active so at this time it does not need to be stabilized. 3. 3186 North Shore Dr. Silt fence on site needs maintenance and there was open soil on site but it is considered active so at this time it does not need to be stabilized. 4. 3825 Cherrv Ave. Perimeter protection is in place and functioning properly and all of the open soil has been stabilized for winter. 5. 2933 Casco Point Rd. Silt fence on site needs maintenance and there was open soil on site but it is considered active so at this time it does not need to be stabilized. 6. 1981 Fagerness Point Rd. Perimeter protection is in place and functioning properly, there was open soil on site but it is considered active so at this time it does not need to be stabilized. 7. 3485 Crystal Place. Perimeter protection is in place and functioning properly, there was open soil on site but it is considered active so at this time it does not need to be stabilized. 8. 70 Wear Lane South. Project is complete and all open soil has been stabilized with sod. 9. 200 Biederwood Dr. Perimeter protection is in place and functioning properly, there was open soil on site but it is considered active so at this time it does not need to be stabilized. 10. 2100 Shadvwood Rd. Silt fence on site needs maintenance and there was open soil on site but it is considered active so at this time it does not need to be stabilized. Evelyn M. Turner From: Johnson, Chad A [Chad.Johnson@bonestroo.com] Sent: Thursday, December 10, 2009 6:07 PM To: Evelyn M. Turner Cc: Tom Kellogg Subject: RE: FYI Winterization Letter mailing Attachments: image001.jpg; Winterization Letter Compliance Summary.pdf Evelyn, As requested I stopped by all of the sites you mailed the Winterization Letter to and have attached a summary report of the things I saw at each of the sites. For the most part all of the projects that should have temporary or permanent stabilization down for the winter did. The only problems I saw were; one project had no perimeter protection and a few projects had silt fence that needed to be fixed up and maintained. Please feel free to contact me immediately should you have questions on any of the sites. Thanks, Chad 7ohnson, CPESC, CPSWQ Direct 651-604-4939 Cel I 651-325-6860 chad.johnson@bonestroo.com � Bonestroo From: Evelyn M. Turner [mailto:ETurner@ci.orono.mn.us] Sent: Friday, November 13, 2009 3:23 PM To: Johnson, Chad A Cc: Kellogg, Tom P; Lyle Oman; Melanie Curtis Subject: FYI Winterization Letter mailing Chad: Tom reviewed your letter and indicated it was appropriate to send out to the smaller projects that you haven't been monitoring. I left your name on it because I didn't think there was anyone here who could answer technical questions about it. Because of the delay in sending it out I added a few days to the compliance deadline. These are going out in today's mail so you can expect phone calls on Monday. All but two of these are single-family houses under construction on isolated lots. Some have just commenced, some have been under construction for a while. Crystal Place is a detached garage on a tiny lot that disturbed most of the lot. (Jasin even removed part of his house to provide access to the garage.) Cherry Avenue is a major addition between the lake and a wetland. Tom and Darren reviewed the grading plans for all these permits. There may be more letters going out next week as I dig more information out of the permit system. Evelyn Turner i