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5. 2006 - 0224 -02 Shetterley Park The Chair recognized Catherine Hostetler to read the staff report. Lynn Patrick: The Chair recognizes the presenters of the application, Jason Durr, the representative of the City and Steve Ernst, Christopher Burke Engineers. Jason Durr: As Steve is handing out those planting plans, I would like to reiterate that this is an emergency project with serious health and environmental issues that could potentially cause some serious erosion problems along the riverbank and again it is unfortunately another location of the odor problems that have been occurring in the neighborhood. The proposal is to repair the brick outfall pipe, stabilize the bank, and als i ns t all a flapper valve gate. Basically, itlooks _like a duckbill that would prevent the gases from escaping at that location. We would then close one additional location where sewer gases are escaping. One of the issues, I know, has to do with the large swath of plantings that we would have to remove to provide the access ramp to get down to the outfall. Unfortunately, the existing grading will not allow us to safely bring equipment down that hill. We asked Christopher Burke Engineers to look at the hill and come up with an appropriate method to maintain a maximum of a 20% slope. We looked at several different routes and came up with this route to minimize the tree removal and planting removal. And as Catherine mentioned in the report, it is our intention to replant the area with seedlings and ground cover. We also propose to plant a number of trees, granted they are now two -inch to three -inch caliper trees, but we are looking at a Bald Cypress tree and a Sycamore tree to try to screen the entrance to the permanent access way. We ask that this permanent access way remain for us to maintain the outfall structure. We do have a CSO crew that is constantly out maintaining our CSOs and we don't want to go back in and wipe out seedlings or trees if we again have problems with that outfall. We are proposing the 12' permanent path that would have the low ground cover that would protect the bank and also provide us with an area where we could take a truck down there or some equipment in order to repair the pipe or replace the flapper valve at the end of the outfall. Lynn Patrick The Chair recognizes Commissioners with questions. I'll go first. Was this a long -term maintenance issue that just came to a head? What precipitated the emergency? Jason Durr: We did some inspection along the edges of the river. We had to do an outfall inspection for our CSO long -term control plan. We found a couple locations, CSO #6 being one of them. Since the slope is so steep at that location, found that the slope was destabilizing and after some further inspection by Christopher Burke found that the pipe itself, the structural integrity of it was in question. The concern became, I don't want to use the word catastrophic, but it potentially could take the hillside down if that pipe were to fail. So instead of reacting we wanted to be proactive and repair this and of course there is the odor issue and we thought we could get two birds with one stone. Joann Sporleder: I've been speaking to some of the neighbors along the way there and it is my understanding that this has been an emergency thing since at least 2000 so it's not really an emergency emergency. The notion of designating an emergency is a way in a sense to avoid public hearings, as I understand the procedure from the Army Corp of Engineers. It has nothing to do with you but is a requirement of those agencies that regulate these things. Jason Dun: We are required to make notification, which we have done. Joann Sporleder: But there was notice at least six years ago that this was also an emergency and nothing much has been done about it since and I think that some people in the audience might address that more fully. March 20, 2006 HPC Minutes Monthly .doc [Preliminary] Page 5