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Amazon Channel - Storm Sewer
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Amazon Channel - Storm Sewer
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Last modified
9/11/2015 11:12:53 AM
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9/11/2015 11:12:06 AM
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PW_Operating
PW_Document_Type_ Operating
Correspondence
Fiscal_Year
2016
PW_Division
Parks and Open Space
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No
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Considerable time was spent discussing the required maintenance at the <br /> entrance of the line section at 24th Avenue. Inspector Todd was insistent <br /> that the large quantity of sediment collecting within 300 feet or so south of <br /> 24th Avenue be removed. He was also concerned that all of the large <br /> vegetation including the trees growing along the slopes of this section be <br /> removed along with the sediments bars. <br /> The inspector was also concerned with the bank sloughing occurring near <br /> Chambers Street, West 11th Avenue, and Bertlesen Road. Another area of <br /> concern was the heavy blackberry growth along the north bank of the channel <br /> near the fairgrounds. This was the area that the blackberries are so <br /> extensive it was impossible to do proper bank inspection. <br /> As you know we had planned to do the sediment removal south of 24th Avenue <br /> last summer. That was when we had several meetings to consider alternate <br /> solutions. Since it was nearly impossible to remove the sedimentation through <br /> volunteer efforts, we were going to do it with the Gradall . As you probably <br /> recall , before we got the work done last summer it got too wet. The work was <br /> rescheduled for early this summer. When we met with the South Amazon <br /> Volunteer Group at Morse Ranch earlier this year, they requested that the work <br /> not be done until after August. It is our plan to remove the sedimentation <br /> beginning on September 8th. We plan to lower the cat into the channel to push <br /> the material to where the Gradall can safely load it into trucks with a <br /> minimum impact to the banks. This method should minimize vegetation <br /> disturbance on the banks. We will need to do some minor leveling along the <br /> top of the bank so the equipment can operate. Hay bales will be placed along <br /> the lined section of the channel just north of 24th Avenue to trap any <br /> sediment that results from the channel work. We will try not to disturb <br /> anymore of the bank vegetation than necessary. We will also remove some of <br /> the heavy woody vegetation along the bank to meet the Corps requirement in <br /> this section. We will also use the Gradall to remove the sediment bars at the <br /> other mentioned crossings. We will replant disturbed areas to minimize <br /> erosion. <br /> Another volunteer work party could be utilized to remove the remaining woody <br /> vegetation between 31st and 33rd Avenues and to thin out the brush and trees <br /> that are just north of 29th Avenue that were of concern to the Corps <br /> Inspector. Randy, do you think the same group would be interested? It would <br /> be our plan to use the Gradall brush head to mow all the blackberries along <br /> the fairgrounds section. I think that the Gradall can also be used to <br /> effectively remove the blackberries through the park section. A volunteer <br /> effort to replant these sections and to do some on-going maintenance to keep <br /> the blackberries from reoccurring might be worthwhile. <br /> I have discussed this approach with Les Lyle and his stormwater staff. We <br /> feel that we can accomplish the work required by the Corp. in a manner that <br /> minimally impacts the channel habitat and vegetation. <br /> If you have any thoughts about this work, please let me know. <br />
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