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<br />. <br /> <br />Mr. Steve Ach <br />June 15, 1994 <br />Page Two <br /> <br />B. Grading, Drainage, and Erosion Plan <br /> <br />1. The drainage plan shows two locations in Block I where catchbasins are <br />extended to the rear lots. This creates potential maintenance and flooding <br />problems, should the catchbasins become plugged. We would recommend <br />that these storm sewer facilities be eliminated from the internal portion of <br />Block 1 and the grading plan be changed to reflect overland drainage to the <br />street. <br /> <br />2,. The front elevation of the building pad in Lot 11, Block 3, appears to be <br />incorrect. It is shown as 884.5. It appears that it should be 887.0. <br /> <br />3. <br /> <br />There are a number of rear lots on this project that appear to have relatively <br />flat grades. We understand that this is a mass grading plan and will be <br />followed up with a development plan which reflects actual grading on the site. <br />In order to properly review the development plan when it is prepared, spot <br />elevations should be provided on any flat lots along with drainage arrows to <br />accurately reflect the intent of the drainage. <br /> <br />. <br /> <br />4. Since the project entails grading an area larger than five acres, it will require <br />an NPDES permit from the :MJ>CA. <br /> <br />5. The storm sewer laid out on Landers Street crosses the centerline of the road. <br />The final design of this should keep the storm sewer facilities on one side of <br />the road to avoid conflicts with other utilities. <br /> <br />6. It appears the spot elevations and contour lines on Landers Street do not <br />correctly reflect the contour lines as shown. This area should be reanalyzed. <br /> <br />7. The street section shown on the plans is adequate for the project. <br /> <br />8. Silt fence is shown along the entire northerly boundary of the site and the <br />southerly boundary of the site. There is no silt fence shown along the <br />westerly boundary where the site adjoins Sandpiper Estates. Any areas that <br />have potential for erosion onto these existing lots should also have silt fence <br />installed . <br /> <br />9. <br /> <br />The plan calls for a berm approximately four feet high along the entire <br />southern length of the plat and the eastern side where the single family lots <br />abut Joplin Street. <br /> <br />. <br /> <br />230/232-1509.jun <br />