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Ms. Katie Larsen <br />2/23/2022 <br />Page 2 <br />4. AppliGant to 815 905 <br />the the The-4- <br />review GE)RtG6IFS <br />appear <br />on east side ef site. <br />Applicant5. <br />.0_ the Rerth t <br />. .0. GGRtG6IF OR <br />GE)RtG6IF OR side of <br />the east side of the site-. <br />The have been revis <br />lessens the the driveway <br />plans <br />6. Staff rer.ernmends that the <br />appliGant <br />On <br />grade at <br />entrance. The slope the curb <br />approximately .% <br />on the south side of the entrance appears to <br />We lowering the <br />we waRt 2% aGFOSS the drive. <br />aren't grade as <br />• Stormwater Management <br />The stormwater on the site flows to the east to the City's Pine Glen Pond that discharges <br />west to storm sewer along Lake Drive. <br />The surface water from the proposed building and parking lot will flow to several proposed <br />infiltration basins along the west, north, and east sides of the property and to a drainage <br />pond on the south side of the site. Rain guardian turrets are proposed to direct runoff to <br />the infiltration basins and the drainage pond. The infiltration basins are designed to <br />provide water quality treatment and rate control. <br />After the project is completed, the site will include new impervious surfaces including the <br />parking lot and building. <br />The site is proposed to outlet to a City of Lino Lakes pond east of the site that was <br />constructed during the Pine Glen development. Staff worked with the applicant to verify <br />that the pond has capacity to handle the runoff from the proposed site. <br />Based on the soil boring information, the groundwater elevation on the site is between <br />802.4 and 802.62 892.4 and 892.62. Soils consist of poorly graded sands and gravelly <br />sands. <br />The applicant used a HydroCAD model based on the Atlas 14, 24-hour storms to design <br />the storm sewer conveyance system and basin. The site is designed to reduce site runoff <br />rates for the 2-, 10-, and 100-year rainfall events. <br />Pre- and Post- Development Discharge Rates (cfs) <br />Condition <br />2-Year <br />10-Year <br />100-Year <br />Pre -Development <br />0.28 <br />1.20 <br />3.79 <br />Post -Development <br />0.23 <br />1.19 <br />3.17 <br />Post -development stormwater discharge rates are less than the pre -development rates. <br />Comments: <br />Precision Tune Engineering Review <br />