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--~ ~ -x= ~/linnesc~~a P~~tutiQn ~a~tr~! ~ge~c~r .~,~.~. ~ 520 Lafayette Road North I St Paul, MN 55155-4194 ~ 651-296-6300 1800-657-3864 ~ 651-282-5332 TTY I www.pcastate.mn.us March 9, 2011 Ms. Rebecca Haug Environmental Administrator City of Elk River 1306 Orono Parkway NW Elk River, MN 55330 Re: Plaisted Companies Sand and Gravel Mining Operation Environmental Assessment Worksheet Dear Ms. Haug: Thank you for the opportunity to review and comment on the Environmental Assessment Worksheet (EAW) for the Plaisted Companies Sand and Gravel Mining Project (Project) in Sherburne County, Minnesota. The Project consists of the extraction and processing of aggregates from a 30.6-acre parcel of property adjacent to an existing sand and gravel mining operation. Regarding matters for which the Minnesota Pollution Control Agency (MPCA) has regulatory responsibility and other interests, MPCA staff has the following comments for your consideration. Proiett Maenitude Data (Item 71 The EAW indicates there will be no buildings on the site. However, aerial photos indicate several buildings on the north end of the site. Please indicate if these buildings will be removed and if there are existing wells for these buildings that have not been listed in Item 13. Permits and Approvals Required (Item 8) This item should also include an air emission permit as being required from the MPCA. Since the EAW does not discuss the Project's potential to emit for all criteria pollutants, it is not possible to determine from the information provided whether the Project will require a Nonmetallic Mineral Processing General Permit or a Part 70 Title V Permit. It is the responsibility of the Project proposer to determine the type of air permit necessary for this specific operation. Application forms and instructions are available on the MPCA's website at http://www.pca.state.mn.us/air/permits/forms.html#4a. The Project proposer should also be aware that operation of a stationary crusher and aggregate spread that is greater than 25 tons per hour capacity, or greater than 150 tons per hour portable, and assuming the equipment is newer than 8/31/83, is subject to 40 CFR 60 Subpart 000 of the federal New Source Performance Standards. Under this subpart, the facility owner must conduct specific performance testing (i.e., opacity testing) when the mining site is in normal operation. Depending upon crusher size (tons per year) and year of manufacture, and generator horsepower and year of manufacture, the operation may also be subject to Subpart ZZZZ of the federal National Emissions Standards for Hazardous Air Pollutants, which has additional reporting requirements. If you have any questions on air permitting issues, please contact 1im Kolar in our St. Paul office at 651-757-2174. Equal Opportunity Employer