Laserfiche WebLink
Civil Engineering <br />Land Surveying <br />Land Planning <br /> <br />John Oliver & Associates, Inc. <br /> <br />580 Dodge Avenue, Elk River, MN $$$$0 <br />(612) 441-2072 . Fax: 441-5665 <br /> <br />August 22, 1996 <br /> <br />Mr. James Charest <br />2819 ll9th Avenue <br />Coon Rapids, MN <br /> <br />55433 <br /> <br />RE: Grading and Drainage Plan - Elk River, MN <br /> <br />Dear Mr. Charest: <br /> <br />We have completed your Grading and Drainage Plan, and have enclosed 10 prints of the <br />plan. Also enclosed is the wetland delineation performed by Dan Wing of Eco Systems <br />Engineering, Inc. <br /> <br />The drainage of the site will have minor changes from existing. The soils located at the site <br />are Hubbard Sandy Loam, Hubbard Loamy Sand, and Isanti Loamy Fine Sand. These soils <br />are all in Hydrologic Group A (see attached soils map). The central low area collects runoff <br />from 12.79 acres at present. For the proposed conditions this Iow area will collect the <br />runoff from 12.87 acres (See the Enclosed drawings depicting the drainage areas). The Iow <br />area has the following stage storage relationship: <br /> <br />"ELEVATION AREA .... INCREMENTAL VOLUME <br />fl acre VOLUME (acre-~ acre-~ <br />867 0 0 0 <br />868 0.06 0.03 0.03 <br />870 0.99 1.05 ~.08 <br />871.3 1.77 1.79 2.87 <br /> <br />This low area is not landlocked, it would release at an approximate elevation of 871.3 into <br />a wetland delineated on the grading plan to the north east. <br /> <br />The runoff volume will increase due to adding additional impervious areas, the existing <br />Curve Number for the area flowing to the Iow area is 50, and the proposed Curve number <br />is 51 (See the enclosed worksheets used for calculating the Curve numbers). <br /> <br />Offices in Elk River & Burnsville <br /> <br /> <br />