CCP 01-09-1995 - Laserfiche WebLink

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I. I I. feet long and conveys wastewater from TCAAP to a City of Mounds View sewer running I westerly along County Road H. PAGE 13 (Bottom) I See the above comment. I PAGE 14 I The statement is made, "An existing 12-inch diameter watennain would be extended across Highway 96 and Hamline Avenue and then into the COMF site. The size of the watennain and pressure in the city system would provide adequate fire flow at the hydrant located on the . COMF site." Documentation of the required fire flow should be provided. Also, an estimate of the flow I that can be provided by a single hydrant at the end of a long 12" 0'/10" 0' dead-end should be provided. Unless the buildings have fire sprinkler systems, I have reservations that a long 12" 0'/10" 0' dead-end can provide the required fire flow through a single hydrant. I From past experience with the Lake Johanna Fire Department, it is doubtful that they will be .. willing to accept a single hydrant. However, the number and placing of hydrants is beyond the scope of this review and should be coordinated with them. . If fire sprinkler systems exist in the three buildings, the required fire flow will be greatly reduced. Under this scenario, a 12" 0/10" 0' dead-end may be adequate to provide the required fire flow. I FlGURE 5 (Follows Page 14) I The 4" 10 forcemain is shown to discharge to Arden Hills Manhole #12. This will result in the National Guard flow being routed to an existing lift station in the northeast portion of Arden Hills. The lift station is reportedly near capacity. To avoid capacity problems with this lift . station and to avoid having to pump the National Guard flow, the forcemain should be extended further south along Hamline Avenue. This would result in the National Guard flow being discharged to an existing gravity sewer that runs to the south. Pumping and capacity I problems would be avoided with this approach. . The proposed 4" 10 forcemain and 12" 10 watennain are shown in a single 30" 0' casing across Minnesota Trunk Highway 96. This proposed construction violates Minnesota Department of Health (MDB) requirements for separation distance between a sanitary sewer and a watennain. . Even if the MDH should grant a variance, the proposed construction would make future replacement of either line difficult. Separate casings should be required. .. The proposed lift station location likely results in the least cost to the National Guard. However, it is a poor location if other property is to be served by the lift station. Also, the proposed location is a poor location if Arden Hills is to maintain it because it is on TCAAP I property. 520/053-0306.jllJl