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HomeMy WebLinkAbout2004.11.02_City Council Minutes OW ASSO CITY COUNCIL MINUTES OF REGULAR MEETING Tuesday, November 2, 2004 The Owasso City Council met in regular session on Tuesday, November 2, 2004 in the Council Chambers at Old Central per the Notice of Public Meeting and Agenda posted on the City Hall bulletin board at 5:00 p.m. on Friday, October 29,2004. ITEM 1. CALL TO ORDER The meeting was called to order at 6:30 p.m. ITEM 2. INVOCATION The invocation was offered by Bruce McCarty, Senior Pastor of Owasso First Assembly of God. ITEM 3. FLAG SALUTE Councilor Steve Cataudella led the flag salute. ITEM 4. ROLL CALL PRESENT Susan Kimball, Mayor Craig Thoende1, Vice Mayor Steve Cataudella, Councilor Gary Cochran, Councilor ABSENT Brent Colgan, Councilor A quorum was declared present. STAFF Rodney 1. Ray, City Manager Ronald Cates, City Attorney ITEM 5. MAYOR'S PRESENTATION Mayor Kimball, along with the City Councilors, presented to Roger Voss a citation issued by the State of Oklahoma and endorsed by Representative Jo1m Smaligo and Senator Randy Brogdon, commending Roger's outstanding volunteer service. Owasso City Council November 2,2004 ITEM 6. MAYOR'S PRESENTATION Mayor Kimball introduced Marty Cooper, Manager of Ow as so Wa1-Mart, and presented to him a plaque thanking him for Wa1-Mart's 'Safe Neighborhoods Grant' program's recent contribution to the City of Owasso Police and Fire Departments. Mr. Cooper accepted the plaque on behalf of all employees of the Owasso Wa1-Mart. ITEM 7. PRESENTATION OF THE CHARACTER TRAIT OF GRATEFULNESS, FOLLOWED BY A PUBLIC SERVICE ANNOUNCEMENT Bruce McCarty, Senior Pastor of Owasso First Assembly of God, presented to the Council 'Gratefulness', the character trait of the month for November, 2004. ITEM 8. PRESENT A TION OF EMPLOYEE OF THE MONTH Mr. Ray introduced Cynthia Miller, a dispatcher in the Police Communications Division, as the City's Employee of the Month for November, 2004. ITEM 9. CONSIDERATION AND APPROPRIATE ACTION RELATING TO A REQUEST FOR COUNCIL APPROV AL OF THE CONSENT AGENDA A. Approval of Minutes of the October 11, 2004 Special Meeting and the October 19,2004 Regular Meeting B. Approval of Claims C. Action relating to Council approval to increase AFIS fees collected by the City of Owasso on all criminal misdemeanor and traffic violations resulting in an adjudication of guilt or a finding that results in a suspended or deferred sentence. This increase in fees collected is pursuant to Senate Bill 1542, signed by Governor Brad Henry on March 28, 2004. D. Action relating to a request for Council acceptance of the Dirty Dawg Mini Storage water system, sanitary sewer system, and stonn water drainage system. E. Action relating to Council approval of Ordinance No. 797, an ordinance approving the annexation request of Henry Penix, as made in application number OA 04-07, providing for the annexation of approximately 9.274 acres, more or less, generally located at the southeast corner of East 76th Street NOlih and NOlih 129th East Avenue, and repealing all ordinances or parts of ordinances in conflict herewith. 2 Owasso City Council November 2,2004 F. Action relating to Council approval of Ordinance No. 798, an ordinance approving the annexation request from Owasso Land Trust, as made in application number OA 04-08, providing for the annexation of approximately 30 acres, more or less, generally located Yz mile south of East 116th Street North on the east side of North Garnett Road, and repealing all ordinances or parts of ordinances in conflict herewith. Mr. Cataudella moved, seconded by Mr. Cochran, to approve the Consent Agenda with claims totaling $114,701.97, and payroll claims totaling $264,282.47. YEA: Cataudella, Cochran, Kimball, Thoende1 NAY: None Motion carried 4-00 ITEM 10. CITIZEN REQUEST TO ADDRESS THE CITY COUNCIL REGARDING STORMW ATER DRAINAGE ISSUES IN THE SILVER CREEK ADDITION. Mr. Kenneth Yates, a resident of the Silver Creek Addition, addressed the Council regarding stormwater issues in the Silver Creek sub-division. Mr. Yates gave to each Council member a packet containing copies of correspondence, maps, reports, etc. regarding the stormwater issues and asked that this packet be entered into the record of this Council meeting. Mr. Ray responded to Mr. Yates concerns by saying a significant amount of work had been done - 1) funds budgeted, 2) concept approved, and 3) land acquired, and construction should begin in the next few weeks. Taking into consideration possible weather constraints, the project should be completed by early spring. Mr. Thoende1 asked ifMr. Ray could update the Council weekly on this project and Mr. Ray said this certainly could be done, and he would include a timeline for the project. ITEM 11. CONSIDERATION AND APPROPRIATE ACTION RELATING TO A REQUEST FOR COUNCIL CONFIRMATION OF A NOMINATION BY THE MAYOR TO SERVE AS A TRUSTEE ON THE METROPOLITAN ENVIRONMENTAL TRUST AUTHORITY. Ms. Kimball presented Ana Stagg, Owasso Public Works Director, as her appointment to the Metropolitan Environmental Tmst Authority and asked for Council confirmation of this appointment. Mr. Cochran moved, seconded by Mr. Thoende1, for Council confirmation of this appointment. YEA: Cataudella, Cochran, Kimball, Thoendel NAY: None Motion carried 4-0. 3 Owasso City Council November 2,2004 ITEM 12. CONSIDERATION AND APPROPRIATE ACTION RELATING TO A REQUEST FOR COUNCIL APPROVAL OF A FINAL PLAT FOR RENAISSANCE CENTER FROM ED LONG. THE SUBJECT PROPERTY IS LOCATED IN THE SOUTHEAST CORNER OF EAST 86TH STREET NORTH AND NORTH 137TH EAST AVENUE, CONTAINING APPROXIMATELY 3.264 ACRES, MORE OR LESS. Mr. Cuthbertson presented the item. Mr. Cataudella moved, seconded by Mr. Thoende1, for Council approval of the Renaissance Center final plat. YEA: Cataudella, Cochran, Kimball, Thoende1 NAY: None Motion carried 4-0. ITEM 13. CONSIDERATION AND APPROPRIATE ACTION RELATING TO A REQUEST FOR COUNCIL ACCEPTANCE OF A COMMUNITY DEVELOPMENT BLOCK GRANT (CDBG) IN THE AMOUNT OF $66,450.00 FOR THE PURPOSE OF CONSTRUCTING A HANDICAPPED ACCESSIBLE RESTROOM AND SIDEWALK ACCESS TO THE OW ASSO SKATE PARK. Mr. Wiles presented the item. Mr. Cochran moved, seconded by Mr. Cataudella, for Council acceptance of the Small Cities set-aside grant from the Oklahoma Department of Commerce, and authorize the Mayor to execute the acceptance letter and all appropriate documents. YEA: Cataudella, Cochran, Kimball, Thoende1 NAY: None Motion carried 4-0. ITEM 14. CONSIDERATION AND APPROPRIATE ACTION RELATING TO A REQUEST FOR COUNCIL APPROVAL TO AWARD A CONSTRUCTION BID FOR THE FY 2003 CDBG SIDEWALK REHABIUT A TION PROJECT. Ms. Stagg presented the item. Mr. Cataudella moved, seconded by Mr. Cochran, for Council approval to award the construction contract for the FY 2003 Sidewalk Rehabilitation Project to APAC-Oklahoma, Inc. of Tulsa, Oklahoma in the amount of$133,371.00. YEA: Cataudella, Cochran, Kimball, Thoendel NAY: None Motion canied 4-0. 4 Owasso City Council November 2,2004 ITEM 15. REPORT FROM CITY MANAGER None ITEM 16. REPORT FROM CITY ATTORNEY None ITEM 17. REPORT FROM CITY COUNCILORS Mr. Cochran commended Police Chief Yancey on the quick actions taken by officers when rescuing two young boys from a flooded drainage ditch. Mayor Kimball thanked the City staff volunteers for their hard work during the Fall Festival held the previous weekend. ITEM 18. NEW BUSINESS None ITEM 19. ADJOURNMENT Mr. Cochran moved, seconded by Mr. Cataudella, to adjourn. YEA: Cataudella, Cochran, Kimball, Thoendel NAY: None Motion carried 4-0 and the meeting was adjourned at 8:02 p.m. 5 To: Mr. Rodney Ray Members of Owasso City Council Mrs. Ana Stagg Mr. Tom Morris Mr. Ron Tracy From: Kenneth Y ates ,;.(~ Date: November 2,2004 RE: Storm Water Drainage - Silver Creek and Nottingham On June 11,2001, I met with Mr. Tom Morris and Mr. Ron Tracy to discuss a serious flooding/drainage problem at our residence in Silver Creek. At the conclusion of this meeting I was told by Mr. Morris that the problem would be corrected, but no corrective action was ever taken. This prompted me to seek relief through the Owasso City Council and Mr. Rodney Ray, City Manager. My appeal to the City Council on November 4, 2003, was answered with a report prepared by Janet Meshek ofMeshek & Associates, Inc., and sent to Mr. Robert Carr on January 6, 2004. This report affirmed my contention that there was indeed a serious problem with storm water drainage in the Silver Creek addition, a problem created by flawed engineering and the failure to review design criteria. After reviewing this report by Janet Meshek, a remedy was proposed on February 9,2004, (please note the attached "Plan" prepared by the Owasso Public Works Department), and the appropriate parties were notified, but to date there has not been an engineering plan approved, or construction activity begun. Nearly nine months have passed and at this time the project seems to be stalled due to reasons that I am unable to understand. The high risk of property damage due to flooding of our home, as well as other property in the Bradfords, the Willows, and the Village was affirmed in the attached report by Janet Meshak. I believe that any property damages or structural problems that have occurred or may occur due to this uncorrected problem with storm water must be accounted to those parties who bear the responsibility for the problem and the solution. I still maintain hope that the "system" will work, and corrective action will be taken. I am writing you to demonstrate that due diligence and effort has been made on my part to effect a solution. MESHEK & ASSOCIATES, INC. P.O. Box 636 @ 20 W. 2nd Street, Suite 200 Sand Springs, OK 74063 918-241-2803 fax: 918-241-9245 www.meshekengr.com January 6, 2004 " Mr. F. Robert Carr, Jr., PE Public Works Director City of Owasso 301 West 2nd Ave. Owasso, OK 74055 Re: Silver Creek Addition Stormwater Drainage and Detention Analysis Dear Mr. Carr: As per our discussions with you, Ms. Stagg and Mr. Cross, we have prepared this analysis of the flooding problems within the Silver Creek Additions. We have used City documents for sizes and elevations. We have adjusted the elevations in the Bradfords plans upward by 1.2 feet to accommodate what appears to be a datum shift. At some point however, the analysis should be revised using actual elevation data obtained from field surveys and as-built plans. Existing Conditions Our preliminary investigation of the current conditions for the watershed draining the Willows at Silver creek, the Bradfords at Silver creek and Nottingham Additions, as well as the Village at Silver creek indicates that the 36-inch pipe draining Subareas 240 and 230 will almost carry a 2-year discharge before overtopping into the Village Addition and detention pond. The Subareas are shown on the enclosed figure labeled "Silver Creek HMS Data Schematic". Subarea 240 drains to an existing pond with minimal storage. In our investigation, the "weir" section was rated with existing storage to account for any possible routing effect. The outflow from this pond was then routed through Subarea 230 and combined with the runoff from that area. 1230 denotes the junction of all of the upstream area at the upper end of the 36-inch pipe inlet on the east side ofthe Bradfords subdivision. This pipe has a capacity of approximately 45-50 cfs before the water upstream will ove110p into the Village subdivision and make its way over platted lots and between future homes to that detention pond. An existing 2-year storm produces a peak flow rate at J230 of 51 cis, and a 5-year storm produces a peak flow rate of 166 cfs with an overflow peak of 125 cis. The diversion ofthe 5-year overflow to the Village produces an overflow volume of 4.2 acre-feet, and eventually makes its way into the Village detention pond. That pond has a total estimated volume of approximately 4.6 acre-feet. 030WAOJ . Mr. F. Robert Carr, PE 02/09/04 Page 2 Our HMS model includes a diverted hydro graph (DIV 230) at the upper end of the 36- inch pipe. The hydro graph for the Village only (620) is routed through the Village detention pond. The diverted hydro graph from upstream bypasses the pond and flows through the lots at the south end of the Village, because the pond has been filled by the local drainage. The diverted 5-year hydro graph for flow rates larger than the capacity of the 36-inch pipe contains 4.2 acre-feet of volume. Since the total pond volume is 4.6 acre-feet, any diverted water that makes its way into the pond will cause the 5-year storm to overtop the Village detention pond. The overflow volume fi'om the 2-year storm is only about 0.2 acre-feet, so the 2-year storm will probably be contained by the Village pond, as long as it can enter it through the sump in front of the lots at the south end. If there were no diversion of flow to the Village detention pond, it appears that the Village detention pond would contain the 100-year storm from subareas 620,610 and 600 alone, with a little freeboard, but would overtop at the 500-year storm. From the information gathered from the City files, it does not appear that any overflow from the 36-inch pipe (DIV230) was considered in the Village detention pond design. The construction plans for the Bradfords pond list the 100-year flow rate at 42 cfs at the fIrst upstream junction on the 36-inch pipe on the east side ofthe addition. The drainage study for the Bradsfords pond shows a pre-project drainage area of 47 acres and a post- project drainage area of acres, with IOO-year inflow rates of64 cfs and 187 cfs respectively. Our calculations show an existing 100-year flow rate of383 cfs at the upper end of the 36-inch pipe. The drainage area to this point is 78 acres, with a total drainage area to the pond of acres. Our calculations show an existing 100-year inflow to the Bradfords pond of 436 cfs. While our calculations may be somewhat higher because of some developed discharge the area, the flow rates and drainage areas shown on the Bradfords plans and in the report used for design, appear to be in error. Storm of October 9, 2003 With current conditions, the 36-inch pipe on the east side of the Bradfords will barely handle a I-year storm. During the October 9, 2003 storm, the water plant for the City of Owasso received 3.48 inches of rainfall, falling within 6-hours according to City staff. This is approximately a 5-year storm. The Village pond received some of the overflow from the upper end of the 36- inch pipe and filled to more than capacity according to the picture shown above, with the remainder bypassing the pond. The picture shows the east side of the Village pond facing north. The pond is overflowing to the undeveloped commercial property on the east side. 030WAO! III Mr. F. Robert Carr, PE 02/09/04 Page 3 The picture to the right is taken of the double 6x4 RCB under 86th St. North during that same storm. We computed a 5-year peak flow of 130 cfs at the roadway from the Village pond and the uncontrolled flows. We have assumed that the pond was constructed as shown on the plans but with the outlet blocked. This was the condition during this storm. The discharge from subarea 620 filled the pond and the overflow from the upper end of the 36-inch pipe mostly bypassed the pond. The total flow to the double 6x4 RCB of 130 cfs would require a headwater depth of2.5 feet. The depth shown in the picture appears to be slightly deeper than that, implying that more water may have bypassed the pond. There may have been other debris blockage affecting the water surface elevations, also. Bradfords Pond The Bradfords pond is undersized because an error was apparently made in the measurement of the overall drainage area. Additionally, the method used to size the pond does not meet current City of Owasso drainage criteria. Our calculation ofthe effect of a 5-year storm on this pond shows an inflow of227 cfs and an outflow of 57 cfs, with a peak elevation of 637.5, approximately 1.7 feet below the overflow elevation. This appears to be consistent with the observations made during the October 9th storm. Our calculations show that a lO-year storm would fill the pond to within 0.5 feet of the top. A 25-year storm or larger would overtop the dam. As a minimum, a spillway should be constructed on the pond, with the overflow directed to the upstream end of the drainage structure under 86th St. North. The outflow during the 100-year storm with the current dam is 312 cfs. Of that flow, 75 cfs would be forced through the 36-inch pipe, and 236 cfs would overtop the dam. The spillway would need to accommodate that flow rate at an elevation of639.2. The current 4 x 3 RCB will pass approximately 100 to 120 cfs, depending on available head. This structure should be increased to a triple 4 x 3 RCB. The outflow rates and spillway elevation should be adjusted as required to minimize outflow without causing a backwater-flooding problem from the pond. Additionally, the downstream impacts need to be investigated. The Village pond is too small to accommodate additional stormwater runoff. Even if it is enlarged, the amount of storage required to reduce the 100-year flow rate upstream from the 36-inch-pipe to 53 cfs is approximately 22.5 AF, compared to the 4.6 AF available in the current pond. A storm sewer or ditch system capable of discharging approximately 355 cfs would have to be installed to convey the water to the enlarged Village pond from the current overflow location. nequirements for Flooding Caused by the Inadequate Bradfords Ea~t Storm Sewer fhe only feasible solution to solving or at least mitigating the current flooding problem is to construct a new pond upstream from the 36-inch pipe on the east side of the Bradfords. 030W AD 1 II Mr. F. Robert Carr, PE 02/09/04 Page 4 The pond should contain enough storage to reduce the outflow to the capacity of the 36- inch as designed. We have computed approximate pond volumes that would be required for the various design storms, with the 100-year level of protection being the goal. Additionally we have increased the volumes to deal with future upstream development. If less than the 100-year frequency is chosen for the design storm, any rainfall event greater than that will still divert flow south into the Village. This will decrease that pond's ability to deal with storms of that magnitude and larger. Flooding between houses constructed on the westerly lots will continue to occur because of the ina4equacy ofthe 36-inch pipe. The following table lists the design storms and the volume required to release approximately 50 cfs during the 100-year storm with the upstream area fully developed. Design Storm Required Volume (Year) (Acre-Feet) 1 4.3 2 4.8 5 9.5 10 12.9 25 16.4 50 19.6 100 22.5 500 31.6 WillowslBradfords Storm Sewer Analysis We also investigated the hydraulic grades along the storm sewer systems in the Bradfords and the Willows. The system along 141 st E. Ave. will not cany a I-year storm. The 1- year hydraulic grade line slope in the section from the Willows to the junction box just upstream from the pond is 1.37%, compared to a pipe slope of 0.34%. The segment of pipe from the Willows to the next junction box downstream will overflow at the street during the one-year storm. The inadequacy of the downstream storm sewer system means that for a I-year storm the hydraulic grade will always be at approximately the lowest inlet elevation along the roadway where water can escape. The ongoing drainage problem at the inlet located on Lot 2, Block 3 of the Willows is due to the fact that the inlet is in a sump. The elevation that water would have to reach before relieving itself downstream is approximately 645 to 645.5. The top of the inlet is at elevation 644.25. This inlet will backup to more than a foot deep above the top of the inlet during a storm smaller than a I-year storm, because the downstream storm sewer capacity is so limited. If the hydraulic grade at the inlet in Lot 2, Block 3 could be lowered to no higher than the inlet elevation, a one-year storm can be contained within the westerly storm sewer system within the Willows. ,\ 030WAOl II Mr. F. Robert Carr, PE 02/09/04 Page 6 Divert all of the Willows East Similar to the discussion above, all of the Willows storm sewer system would be diverted to the new pond. The pond upstream from the 36-inch pipe east of the Bradfords would have to be bigger. However, this would make the storm sewer system along 141 st E. Ave. adequate for the 100-year storm. The Willows westerly system would be adequate for a I-year storm and the easterly system would be adequate for a 5-year storm. This would make the downstream Bradfords pond adequate up to the 100-year storm with no increase in structure size at 86th St. North. The following table lists the design storms and the volume required to release 50 cfs with the upstream area fully developed and the Willows completely diverted into the new pond. Design Storm Required Volume (Year) (Acre- Feet) 1 5.6 2 6.4 5 13.3 10 18.4 25 23.5 50 28.1 100 32.5 500 46.0 Recommendations Summary Inadequate 36-inch Storm Sewer on the East Side of the Bradfords The undersized 36-inch pipe on the east side of the Bradfords will continue to cause flooding of the lots along Block 2 of the Village, as well as Lots 11-15 of Block 1. The water that collected in the sump in front of these lots during the October 9th storm could not get into the storm sewer system and flowed over some of those lots onto the commercial property to the south. Ifhouses are constructed on those lots without the recommended upstream detention pond construction, they will be subject to flooding on a continual basis. ,\ As a minimum, a pond should be constructed upstream from this pipe to eliminate the overflow into the Village. Construction of houses on those lots should be postponed until the overflow situation is remedied. 030WAOI II Mr. F. Robert Carr, PE 02/09/04 Page 7 Stonn Sewer System within the Willows/Bradfords Additions We feel that without some improvement to the storm sewer system in the Bradfords and the Willows, the potential for structural flooding ofthe residence on Lot 33, Block 1A is very high. If a house is constructed on Lot 34, Block lA, it will also be in danger of structural flooding, or as a minimum, will make the situation worse. As a minimum, the 10-year parallel storm sewer from the inlet on Lot 2 Block 3 to the Bradfords pond should be constructed. The system upstream fi-om that could then be improved to a 10- year system, should flooding at street sumps for larger storms become a problem in the future. The Bradfords Pond As stated earlier, a spillway should be constructed on the pond, with the overflow directed to the drainage structure tmder 86th St. North to carry the excess flow for storms larger than the 10-year. This newly-constructed 4 x 3 RCB structure at 86th St. North should be increased to a triple 4 x 3 RCB. Please let us know if you have any comments or questions. Sincerely, ~KMr~ Janet K. Meshek, PE, CFM Meshek and Associates, Inc. Cc: Mr. Chris Cross Ms. Ana Stagg, PE encl 030WAOl III Summary of Plan to Solve Silver Creek Drainage Issues Prepared by Public Works Department Engineering Division on February 9,2004 The letter dated January 6,2004 from Janet Meshek provides a basis for addressing drainage concerns expressed by residents in the Silver Creek area. The following action items should serve as a guide for implementing the recommended solution. .. Meet with the developers and engineers in charge of past and future construction tt Require engineering fIrm that designed the drainage system in the Willows to propose a solution that will be reviewed by the Public Works Department @ Determine probablc construction cost for the selected design e Identify a funding source for completing the project III Prepare contract documcnts and bid the project @ Manage and inspect the construction of the drainage modifications City of Owasso Public Works Department 301 West 2nd Avenue P.O. Box 180 Owasso, OK 74055 (918) 2724959 FAX (918) 2724996 February 17,2004 Mr. Ron Tracy P.O. Box 52298 Tulsa, Oklahoma 74152-0298 Subject: Silver Creek Drainage Modifications Summary of Meeting Notes Dear Mr. Tracy: The purpose of this letter is to formally request a proposal from your firm to remedy the stonnwater drainage deficiencies in the Silver Creek area as we discussed with you at a meeting on February 16,2004. Recent rain events observed by Public Works staff have revealed that the stonn sewer system is not functioning as designed. Details of the deficiencies are identified in a letter dated January 6,2004 from Janet Meshek, a copy of which has been provided to you. As we have discussed, the task of correcting the errors and omissions appears to require the cooperation of a number of parties at this time. Mr. Carr and I first discussed the existing drainage deficiencies with you at a meeting on January 27,2004. Then, J.B. Alexander, you, and I further discussed alternatives for correcting drainage deficiencies at a meeting on February 16, 2004. As we discussed, the two primary objectives for drainage modifications are as follows: 1. Stonnwater overflow must be eliminated at the inlet to an existing 36-inch pipe along the west boundary of the Village at Silver Creek. ~2. Modifications are required to reduce the risk of flood hazards associated with the ~ Willows stormwater drainage system. The following requirements were presented to you for determining a feasible solution: @ A topographic survey of the area north of the Village at Silver Creek is required for proper design and review of drainage modifications. @ The survey must include inlet elevations and flow lines for the storm drainage system upstream of the junction connecting the Willows and Bradfords systems. @ A pond must be designed directly north of the open 36-inch pipe to keep the 100-year peak outflow rate at or below 50 cfs. Mr. Ron Tracy February 19t 2004 Page20f2 GD The outlet structure of the proposed pond must not surcharge the 36-inch pipet which was not designed to operate under pressure. @I All of the flow from the Willows storm drainage system must be diverted to the proposed pond, which must have a maximum water surface elevation below all Willows inlets. @ A permanent emergency overflow channel must be designed for the proposed pond to accommodate discharge in excess of 50 cfs in the event of blockage at the outlet. In addition to the requirements listed above, the following criteria will be used in the review of proposed drainage modifications: @ NRCS (formerly SCS) methods are preferred for hydrologic modeling. @ Plan and profile sheets are required for all storm drainage modifications. @ Hydraulic grade lines must be included on all storm pipe profiles. @ Design of detention facilities must include stage, area, and discharge calculations. @ Existing utilities must be identified along with any proposed relocations. Please respond in writing if you would like to contest this summary of our meeting or propose additional alternatives. Feel free to contact this office at 272-4959 if you have any questions. Sincerely, OW ASSO PUBLIC WORKS DEPARTMENT Chris Cross Project Engineer cc: Robert Carr, Public Works Director J.B. Alexander, Infrastructure Inspector File City of Owasso Public Works Department 301 West 2nd Avenue P.O. Box 180 Owasso, OK 74055 (918) 272-4959 FAX (918) 272-4996 February 10, 2004 Mr. Tom Kimball 8705 N. 140th East Ct. Owasso, OK 74055 Subject: The Village at Silver Creek February 9, 2004 Meeting Dear Mr. Kimball: Thank you for visiting the City of Owasso Public Works Department to discuss options for addressing drainage issues in the Silver Creek area. The purpose of this letter is to summarize the discussion, conclusions, and decisions made to achieve an effective solution for both public and private interests. Please contact our office to indicate your concurrence or to express your concerns with the following summary of the meeting. The meeting was held at 3:30 p.m. on Monday, February 9, 2004 in the Public Works Conference Room. The city staff members in attendance were Robert Carr, J.B. Alexander, Chris Cross, and Eric Wiles. You and Tony Stevens represented the Village at Silver Creek. Mr. Carr started the meeting with an overview of the existing drainage conditions and flood hazards identified in a detailed report prepared b Janet Meshek of Meshek and Associates. The underlying theme of the meeting was, "How can we work together to solve the existing drainage problems?" The existing conditions and alternatives were discussed as follows: @ The 36-inch pipe that collects runoff from the undeveloped area north of the Village is capable of carrying 40 to 50 cfs, which corresponds to slightly less than a 2-year event. @! Any stormwater runoff in excess of the 36-inch pipe capacity flows overland across the westerly lots of the Village and into the detention pond at the southern end of the Village. @! A 5-year storm currently produces a peak flow rate of 166 cfs at the'inlet to the 36-inch pipe with an overflow peak of 125 cfs, which generates an overflow volume approximately equal to the existing volume of the Village detention pond and overtops the east embankment. @! If there was no overflow from the 36-inch pipe to the Village detention pond, it appears that the pond would contain the 100-year storm from the residential area ofthe Village. @! Pictures of the October 9,2003 runoff event validate the findings of the Meshek report. @! Errors were made in the measurement of the drainage area that contributes runoff to the 36- inch pipe, which discharges into the detention pond in the Bradfords of Silver Creek. @! The Brndfords Pond would not contain the 100-year runoff volume even if the 36-inch pipe did not contribute flow to the pond. @! An option exists for constructing a pipe parallel to the existing 36-inch pipe along the west boundary of the Village. Mr. Tom Kimball "February 19,2004 Page 2 of2 following conclusions were reached after a discussion of the existing conditions:_ 1. A number of parties, including the City, appear to have made errors. _ 2. The preservation of marketable private property is of utmost concern. Corrective action is required before the spring storm season. 4. A stormwater detention facility is needed directly north of the 36-inch pipe inlet. S. Excavation is necessary to construct the Village pond as planned. 6. Additional storage capacity is required in excess of the design volume for the Village pond to accommodate runoff from the commercial lot and any area contributing runoff in excess of the existing Village residential development. 7. Options should be evaluated for modifYing the outlet structure of the Village Pond. 8. All of the flow from the Willows should be diverted to the new pond (see No.4). The following decisions were made as part of an agreement to proceed with corrective measures: A. The City will pay for construction of temporary detention directly north of the 36-inch pipe. B. The Developer will have corrective measures designed for review by Public Works. C. The Developer will grant an easement for the construction of the temporary detention. D. The Developer will take action to get the Village pond constructed as designed. Please contact our office if you have questions or concerns. Sincerely, OW ASSO PUBLIC WORKS DEPARTMENT Chris Cross Project Engineer cc: F. Robert Carr, Jr., P.E., Public Works Director Ana Stagg, P.E., Engineering Projects Manager J.B. Alexander, Engineering Technician Eric Wiles, Community Development Director Tony Stevens James Kane