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Ms. Rachel Juba <br />September 15, 2022 <br />Page 2 <br /> <br />Stormwater Management <br /> <br />6. The site is proposing to meet water quality and rate control stormwater management <br />requirements with an underground infiltration chamber adjacent to the proposed building prior <br />to connecting into the existing storm sewer along 147th Street North. Additional information is <br />needed to confirm water quality requirements are being met (see additional comments <br />below). The site is not currently shown to be meeting the City’s 0.1 cfs/ac rate control <br />restriction for the 100-year storm event. Modifications to the underground infiltration chamber <br />may be required. <br />7. The site is located within an Emergency Response Area and a moderate vulnerability <br />Drinking Water Supply Management Area which requires a higher level of engineering review <br />be provided in order to allow for infiltration to confirm infiltration onsite won’t cause adverse <br />impacts to groundwater or drinking water supplies. The applicant will be providing this <br />information, however the type of use is not one that would generally create pollution <br />concerns. <br />8. It is unclear if the storm sewer structure in the southeast corner of the site is on or within the <br />Regional Rail Authority’s Right of Way (RRA ROW). If the structure is on or within the RRA <br />ROW, a Regional Rail permit will be required. <br />9. The site is shown to be meeting all freeboard requirements. <br />10. Stormwater plan and model comments have been provided to applicant and will need to be <br />addressed in future submittals for documentation and permitting purposes. <br /> <br />Wetland <br /> <br />11. There are no wetland impacts associated with the proposed improvements. <br /> <br />Thank you for the opportunity to provide comments on this project. Additional comments may be <br />necessary following the review of the responses to these. If you have any questions, please do <br />not hesitate to contact me at 651-286-8463. <br /> <br />Sincerely, <br /> <br />WSB <br /> <br /> <br /> <br />Mark Erichson, PE <br />City Engineer <br /> <br />cc: Scott Anderson, Public Works Director (email only) <br /> Liz Finnegan, Senior Engineering Technician (email only)