Loading...
10-21-2008 City Council Study Session PacketCity of Grand Island Tuesday, October 21, 2008 Study Session Packet City Council:Mayor: Margaret Hornady City Administrator: Jeff Pederson City Clerk: RaNae Edwards T u 7:00:00 PM Council Chambers - City Hall 100 East First Street Tom Brown Larry Carney John Gericke Peg Gilbert Joyce Haase Robert Meyer Mitchell Nickerson Bob Niemann Kirk Ramsey Jose Zapata Call to OrderCity of Grand Island City Council A - SUBMITTAL OF REQUESTS FOR FUTURE ITEMS Individuals who have appropriate items for City Council consideration should complete the Request for Future Agenda Items form located at the Information Booth. If the issue can be handled administratively without Council action, notification will be provided. If the item is scheduled for a meeting or study session, notification of the date will be given. B - RESERVE TIME TO SPEAK ON AGENDA ITEMS This is an opportunity for individuals wishing to provide input on any of tonight's agenda items to reserve time to speak. Please come forward, state your name and address, and the Agenda topic on which you will be speaking. MAYOR COMMUNICATION This is an opportunity for the Mayor to comment on current events, activities, and issues of interest to the community. Call to Order Pledge of Allegiance Roll Call Invocation - Pastor Scott Taylor, First Christian Church, 2400 West 14th Street This is an open meeting of the Grand Island City Council. The City of Grand Island abides by the Open Meetings Act in conducting business. A copy of the Open Meetings Act is displayed in the back of this room as required by state law. The City Council may vote to go into Closed Session on any agenda item as allowed by state law. City of Grand Island City Council Item -1 Update on Storm Water Drainage Maintenance Tuesday, October 21, 2008 Study Session City of Grand Island Staff Contact: Steve Riehle, Ciity Engineer/Public Works Director City of Grand Island City Council Council Agenda Memo From: Steven P. Riehle, Public Works Directore Meeting: October 21, 2008 Subject: Update on Storm Water Drainage Maintenance Item #’s: 1 Presenter(s): Steven P. Riehle, Public Works Director Background Grand Island received almost 6.5” of rain between Tuesday, June 3rd and Sunday, June 8th, 2008. Ground water levels were already high and soil above the ground water was saturated. The rain fall had a significant impact on ground water levels with a high level of runoff. Records were broken on Monday, June 9th for 16 of 39 ground water level observation wells in the community. Infiltration and inflow overwhelmed the sanitary sewer collection system and waste water treatment plant. Storm water runoff overloaded the storm drainage system. Mother Nature exhibited her tremendous power to impact our environment. Numerous homeowners reported ground water intrusion into their basements. The sanitary sewer collection system was backed up when lift station # 7 at Grant Street by the bike trail and # 19 by Diers & Capital Avenues were unable to keep up. Homes across the community were experiencing sanitary sewer backups in their basements. Flows through the Waste Water Treatment Plant peaked at over 40 Million Gallons per Day (MGD). Streets were flooded, storm drainage inlets were ponding, storm drainage pipes were at capacity, and ditches were backing up. The Utilities Department started up the inactive Parkview drinking water wells to help lower ground water. The pumps were discharged into the storm drainage system. The waste water division added an auxiliary pump at lift station # 7 to pump sanitary sewer flows to a section of the sanitary sewer collection system that had available capacity. An auxiliary pump was installed at lift station # 19 that pumped sanitary sewer flows into the storm sewer system. The streets division unplugged inlets, storm drainage pipes, and ditches to keep the water moving. An irrigation pump and piping was added to the Stolley Park storm drainage system to help with the bottleneck west of Blaine Street. It’s important that a community learn from significant events such as this. Discussion This evening’s presentation will expand on the conditions leading up to the event; actions taken during the event; activities since the event; and a discussion on how to move towards the future. Items that will be covered include: Conditions Leading up to the Event 1. Rainfall 2. Ground Water Levels Actions taken during the event 1. Ground Water Intrusion a. Operation of Parkview Drinking Water Wells 2. Sanitary Sewer Collection System a. Lift Station # 7 Area b. Lift Station # 19 Area Activities since the Event 1. Neighborhood Meetings a. Irish Acres b. Brentwood c. LaMar & Arthur d. Circle Drive & Parkview e. Summerfield 2. Funding for the De-Watering Project 3. Sanitary Sewer Collection System a. Utility Stuffer b. Lift Station # 7 Area c. Lift Station # 19 Area 4. Storm Drainage a. Expanded Ditch Maintenance b. Ditch Clean Out Projects Future Planning 1. Storm Water Drainage Maintenance Plan: a. Standard Operating Procedures i. Underground (storm drainage culverts, inlets, boxes & bridges) ii. Surface drainage system (ditches and detention/retention cells). b. Standards for: i. Operations ii. inspection guidelines iii. structural integrity iv. nuisance control v. sediment removal vi. Deep ditches versus shallow ditches vii. Etc c. Maintenance guidelines: i. removal of debris ii. silt iii. erosion iv. detention cell maintenance v. control of undesirable vegetation vi. mowing vii. sweeping viii. equipment needs and availability ix. staffing requirements x. etc. 2. Future Needs a. Equipment b. Funding c. Staff 3. Engineering Study of Stolley Storm Drainage System 4. Storm Drainage Construction $ budgeted under line item “Construct Drainway – CCC to Wood River 5. Reporting a. Storm Water Program Management software b. City Administrator’s Monthly Report c. Annual storm water report to NDEQ 6. Integrated Capital Improvement Plan for Storm Water Drainage Projects Conclusion This item is presented to the City Council in a Study Session to allow for any questions to be answered and to create a greater understanding of the issue at hand.