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• Mr. Pat Klaers July 10, 1998 Page 8 ■ Watermain Trunk watermain will be looped throughout the development. The issue was raised and reviewed by staff as to when does the trunk watermain loop along Street R and Street A from the southwest corner to the northwest corner need to be completed. It was the Fire Chief's opinion that due to the density of the townhouse units in the southwest corner of the development, the watermain loop needed to be completed with the first phase of the development to ensure that adequate fire fighting capacity was available. E. GRADING AND DRAINAGE ISSUES • Mass Grading We have worked with the Developer's engineer over the past year and a half to establish criteria relative to mass grading of the site. These criteria consisted of things such as maximum slopes, minimum area out of the rear of the house to create a backyard, and the cross-yard drainage. We believe that the current preliminary grading and erosion control plan does a good job of addressing these issues. As each phase of the project moves forward, a • more detailed and larger scale grading and erosion control plan will be prepared and reviewed by staff. At that time, we will be able to review in detail these issues on each particular lot. It is our understanding that the grading of this project will be phase by phase, and only go outside phase boundaries to generate additional fill material if needed, or dispose of excess generated. • Drainage Plan No storm drainage calculations have been submitted at this time. However, we have had lengthy discussions with the Developer's engineer about the calculation method we will look for. The concept that has been laid out shows all storm drainage flowing either westerly, to the regional pond, or easterly, to Trott Brook. Sedimentation ponds are shown for all storm drainage prior to discharge into the internal wetlands. We believe the concept of storm drainage shown on the plans is acceptable. Once the overall concept of the plat layout is approved by the Planning Commission, storm drainage calculations can be prepared and submitted for review. The City constructed a large storm sewer project several years ago, that outlets from the regional pond located in Outlot A, south under CSAH 12. The Developers of Trott Brook Farms will be asked to pay a pro rata share for this construction, since this will be the outlet for a portion of their storm drainage. • Howarc R. Green Comoany O:\PROD\800111]\0240\111-0804.july.doPONSULTING ENGINEERS