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Mr. Steve Ach <br />November 20, 1996 <br />Page Two <br /> <br />B. PRELIMINARY UTILITY PLAN <br /> <br />All watermain within this plat needs to be looped or provide for the <br />opportunity of looping in the future. Therefore, Quirm Court should be <br />looped to 194th Avenue and Rush Court should be looped to Seymour Street. <br /> <br />The preliminary utility plan should show the proposed valve and fn-e hydrant <br />locations, so that these may also be reviewed. <br /> <br />There will be a need for a trunk watermain along Highland Road from <br />County Road 77 to the north along Rush Street tying into the plat of <br />Lafayette Woods. <br /> <br />Sanitary sewer service will need to be evaluated by the City to determine how <br />to best serve this development. The two most likely options would be, first, <br />to have this development construct a lift station of adequate depth and size to <br />serve the entire plat and pump either to the lateral system within Lafayette <br />Woods, or along 193rd Avenue to the trunk line in the Trail corridor. The <br />route of the forcemain would be dependent on timing of the Lafayette Woods <br />development. The other option would be to extend a trunk line from the <br />existing line in the Trail corridor through the south end of Lafayette Woods <br />and terminate at the west plat boundary of Cherrywood Hills at an adequate <br />depth to provide gravity service to the entire plat. We will continue to <br />evaluate these two options and discuss them further as we have more <br />information. <br /> <br />The street section for this plat needs to be 32 feet wide face-of-curb to face- <br />of-curb. The typical pavement section would be 5" of aggregate base and <br />two lifts of biam4nous 3-3 ~,5" in total. This section will need to be verified <br />with soil borings. <br /> <br />C. PRELIMINARY GRADING PLAN <br /> <br />The bulk of the drainage from the plat is routed to a sedimentation pond <br />located in the rear of Lots 15 and 16, Block 4. Drainage calculations will <br />need to be provided for this plat including the sizing of the sedimentation <br />pond. The sedimentation pond should be moved further away from the rear <br />of the houses on those two lots, such that a relatively flat area can be <br />provided at the walk-out elevation before the slope into the pond. <br /> <br />The drainage from the 193rd Avenue cul-de-sac in the southeast comer of the <br />plat needs to be provided with sedimentation ponding, prior to discharge to <br />the wetland. <br /> <br />230/348-1907.nov <br /> <br /> <br />