10/29/2003 Env Bd Packet - Laserfiche WebLink

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.— �+•+•+ +� • .Ju �\ a \..L L.I�LLr\ WPl 1 LI \ 'l ILL Permit Application No 073 Eagle Brook Church Anoka County Ditch 72 pass through the site. The ditch consists mainly of tile lines which daylight onsite and then flow via open ditch to Peltier Lake. The proposed plan is to remove the most downstream 1,4001 linear feet of the main line tile line onsite and abandon the existing alignment. Conveyance for this abandoned section of tile line was previously proposed to be reestablished via an open ditch along the south property boundary and discharge to the existing open ditch section. At the September 24th Board Meeting it was proposed that the reestablished ditch section should be a piped system instead of a ditched system. The Applicant has since submitted plans and hydrologic calculations for a piped system along the same realignment. This system is proposed as a 14 -inch pipe that ties into the main branch (existing 10 -inch at the tie-in location), and at the location of Branch 1 the pipe system is proposed to be upsized to an 18 -inch pipe to handle both the flows from the main branch tile line and Branch 1 (also a 10 -inch pipe). The Applicant has indicated the willingness to construct the reestablished ditch section as either a piped or ditched system. The Applicant will convey a perpetual easement over the realigned section of the ditch to the District and the ditch will be maintained by the District. Based on the submitted hydrologic calculations the proposed reestablished ditch section OR piped system will not reduce the capacity of the ditch system. Design of the proposed realigned section is based on a datum conversion (100 -feet = 904- feet), per survey of the invert of the exiting tile outlet. Minor plan revisions may be required if this datum conversion is not exact at the diversion point and if the existing tile line is at a lower elevation than expected. All lateral connections to the proposed realigned/reconstructed sections of Anoka County Ditch 72 will be maintained. A wetland delineation report has been received and accepted during earlier planning efforts for this site. There are no proposed wetland impacts associated with this project. The RCWD regulatory flood elevation for this site is 887.0. There is no proposed floodplain fill. The submitted plans do not specify a low floor elevation for the Emmons & Olivier Resources, Inc.