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Northlake WE P1-6-SY 900214Kimley. Horn and Associates, Inc. 12660 Coit Road, Suite 200, Dallas, Texas 75251 ~, (214) 386-7007 Raleigh, Charlotte, Nashville, Virginia Beach, Washington, Dallas, Phoenix, February 14, 1990 WestPalmBeach, Tampa, Orlando, FtLauderdale,VeroBeach, Ft. Myers, Stuart Mr. Russell Doyle, P.E. City E~gineer City of Coppell Post Office Box 478 Coppell, Texas 75019 Re: Freliminary Engineering Drainage Study of Northlake Woodlands East Channel North of Bethel School Road Between Hawk Lane and Moore Road. Dear Mr. Doyle: The Northlake Woodlands Subdivision is experiencing a number of drainage and erosion problems. These are evidenced by the photographs included in appendix 1. The purpose of this report is to identify the probable cause of the problems and recommend possible solutions. The study is presented in three parts: Hydrology, Hydraulics, and Summary as follows: Hydrology The watershed area for this tributary is 0.293 square miles in size. A review of the watershed (see aerial photo, appendix 2) as compared to the city Future Land Use Map reveals that the watershed is fully developed. The storm rainfall produces peak discharges at Bethel School Road for this watershed as follows: 2 yr 10 yr 50 yr 100 yr 500 yr 199cfs 467cfs 708cfs 831cfs 1205cfs * cfs = Cubic Feet Per Second These values are the peak for the entire watershed. Values are less at upstream points, so we have reduced values at upstream cross sections to more accurately model the stream hydraulics. Bu#ding client relationships since 1967 Drainage Study City of Coppell Feburary 14, 1990 Page 2 Hydraulics Existing Condition In order to determine the cause of the erosion and drainage problems it is necessary to review the hydraulics of the stormwater runoff as it exists. It is not necessary to model each individual lot along the drainage path to determine the cause of the drainage and erosion problems, rather we have determined the hydraulic conditions by using a limited number of surveyed cross sections to model the flow. The results of the existing condition model are sufficient to make preliminary determinations of the cause of the erosion and drainage problems that exist at the site. Erosion results from excessive velocities and sedimentation occurs when the velocity slows and deposits the eroded soil being carried along with the flow. Velocities in excess uf 8 feet per second would probably result in erosive conditions on earthen channels. The model indicates velocities through the channels range up to 10.4 feet per second, clearly erosive. The floodplain levels predicted by the ~nodel do not appear to be a significant problem. Although we do not have the finished floor slab elevations, it appears from the information available that the floor slabs are well above flood levels. The 100 year flood levels in the subdivision range from a high of 487.3 at Moore Road to a low of 469.3 at Bethel School Road. These flood elevations are based on the preliminary results of this study, and need to be refined for the final design. The one case where the model indicated flooding as a potential problem was at the Bethel School Road culvert. With the existing ground elevations of the channel the roadway above the culvert is overtopped in the 100 year flood by about one half foot. This flooding condition would continue to worsen as sediment fills the culvert. Drainage Study City of Coppell Feburat'y 14, 1990 Page 3 Since the erosion and sedimentation problems are caused by high velocities, correcting these problems involves reducing the velocity by either designing a wider channel, reducing the channel slope, or lining the channel. (See appendix 3 for the improved condition 100 year floodplain) Improvements It is beyond the scope of this study to analyze individual retaining walls, and channel treatments. Throughout the reach of this channel individuals have attempted to correct erosion problems by building retaining walls of concrete, and railroad ties. In one case we even discovered a "homemade" concrete lining in the channel bottom (see picture number 16 in appendix 1). Those individual methods of correcting problems without engineering guidelines often causes additional problems elsewhere. This report investigated two general solutions to this channel area. The fi~'st is to size a grass-lined channel that will convey the flows at a non-erosive velocity. Such a channel could be grass-lined with a shallow 3:1 side slope. The second is to use a drop structure to reduce the slope, thereby reducing the velocities. Alternative 1: Grass-Lined Channel A grass-lined channel could be constructed along the channel generally following the alignment shown in the subdivision construction plans on file with the city. This channel would have 3:1 side slopes and a topwidth as shown in appendix 3. This channel would convey flood waters at a velocity of less than 8 feet per second. The topwidth of the channel varies from 30 feet near Moore Road to about 60 feet near Bethel School Road. Drainage Study City of Coppell Feburary 14, 1990 Page 4 As an alternative to the channel above an enclosed concrete drainage box could be constructed that would accommodate the stormwater flow for the first four lots upstream from Bethel School Road. This would reduce the 60 foot channel through this area to approximately 20 to 30 feet. Alternative 2: Drop Structure A three foot drop structure could be constructed near Moore Road that would lower the flow line and reduce the velocity. This drop structure would allow a slightly smaller channel (a few feet). Drop stuctures also allow more lalitude in working the channel around trees and structures. Summa ~y This report has addressed the erosion, sedimentation and flooding considerations. However, it is possible that much of the soil slippage and other problems are a result of improper compaction, or exceeding the soil slope stability. Before any construction improvements are made additional information and design is required. It is possible to construct retaining walls and still maintain an adequate channel. However, this cannot be done without careful consideration of the effects on upstream and downstream channel conditions. This must be done as part of the final engineer-lng before any improvements could be constructed. As me~,tioned, Bethel School Road is flooded by about 1/2 foot at the 100 year event. An additional box equal to the existing box at this culvert would eliminate this flooding. We are available to discuss this report further. Drainage Study City of Coppell Feburary 14, 1990 Page 5 If you need additional information, please call me. Sincerely, KIMLEY-HORN AND ASSOCIATES, INC. Ronald W. Morrison, P.E. Senior t lydrologist LANE ,' = 21;Z c.f.s. - VILLAWO0£ A NE IARGLEN 'RIVE _..ME~DOWVIEW SCHOOL h �w I. 9 � a I .I Of f ' I d , } , . � + o f w �5',�y. e i ! y !� ♦ I' ., a +r` y 1 .. „.. 1 4F PM 'a ^I. I. tl' ;I r '�I” 1 ,. v f y l a � C� W X, 11 r \ A V� . u d 4 f � » P )Y P.. w II I '�I ' r h r V r l y + i.. 4' A... YY j'114,;''.141110,14,', r h 4. , I, :, it � �. Mu" ` • .., 'tw1111AW'Mr� ■ •wYw.». 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""�I .S' � " .., p 0 " gi g I 1 0 � " �, II j � �I 07. . g e COPPELL PUBLIC WORKS DATE: TO: FROM: RE: February 8, 1990 Steve Goram, Director of Public Works Russell Doy~City Engineer NLWE 2 Weeks Study by Ron Morrison / Amendment to the Anderson Master Plan Completion Contract (Tickler 2/5/90 and Combined with the Anderson Plan) Attached is the Department's original of the amendment to the Kimley-Horn Contract for the Anderson Master Plans to the two weeks of work on the Northlake Woodlands East (NLWE) Drainway. Ron Morrison has started the project already, taking our as builts with him last Monday morning when we met with him on the Master Plan project. As noted on the 2/5/90 tickler, this tickler will be attached to the 2/19/90 tickler on the completion of the Anderson Plan and carry forward together. The next tickler for both to be presented on the agenda is 2/14/90. RRD / bb Attachment 2 WEEKS. RRD DATE= TO= VIA= FROM = CO] February 2, 1990 Alan Ratllff, City Manager ,'p'~ .... ~ . -..~ Steve Goram, Director of Public Wq Russell Doyl~'~., City Engineer ~-..~- ~> ~ ~ ; ~ ~.~ ~ ~ ~ io~ ~en~ent to~e Kimley-Horn Contract for the Complet of the ~derson Master Plan (see attached sketch) As we discussed, attached are three copies of subject amendment for engineering work to be done on the Northlake Woodlands East Tributary north of Bethel School Road, just west of Hawk Lane. This study will be done in two weeks and can be presented to the City Council at the regularly scheduled February 27, 1990 meeting. The study will determine the existing floodplain and provide recommendations for improvements to correct current problems as well as to accommodate any future additional storm water flows. The results of the study will provide guidelines to any adjacent landowner if they want to do improvements along the creek. If there are any questions, please let me know. Thank you. SGG/bb Attachment CITY.MANAGER IKimley. Horn I Kimley-Horn and Associates, Inc. ENGINEERS · PLANNERS * SURVEYORS 12660 Coit Road, Suite 200 Dallas, Texas 75251 214 386-7007 Facsimile 214 239-3820 February 1, 1990 Mr. Russell Doyle, P.E. City Engineer City of Coppell Post Office Box 478 Coppell, Texas 75019 Re: Amendment to Existing Master Drainage Plan Contract to provide Engineering Services for a Drainage Study of Problem Areas in Northlake Woodlands East, Coppell, Texas Dear Mr. Doyle: We are very pleased to submit to you this amendment to our existing Master Drainage Plan Contract for professional engineering services for an evaluation of drainage and erosion problems in the Northlake Woodlands East Subdivision in Coppell, Texas. The location of the drainage area through the subdivision is shown in Attachment 1. We propose to provide the following services outlined per task: SCOPE OF SERVICES Task 1: Research and Data Collection Obtain and review existing information provided by the City related to the project. This information includes the following: Floodplain information available as part of the Phase I Master Drainage Master Plan being prepared by Kimley Horn. Construction Plans for the Northlake Woodlands East Subdivision. · City Topographic Maps Field surveys of the channels conducted in August 1988 by Ginn Inc. · Field observations Field surveys will be conducted to augment previous data available. These field surveys will be limited to flow line points and selected other points to define minimum data necessary to develop existing conditions necessary for comparison purposes. Anaheim * Charlotte · Dallas * Fort Lauderdale * For[ Myers * Nashville · Orlando * Phoenix Raleigh * San Diego , Stuart · Tampa * Veto Beach · Virginia Beach · West Palm Beach Building client relationships s~nce 1967 Mr. Russell Doyle, P.E. - 2 - February 1, 1990 Task 2: Hydroloeic Analysis We propose to use the hydrology developed in the Phase I Master Drainage Plan for peak discharge values. Since the watershed is very close to being fully-developed, we will assume that the existing and ultimate condition discharges are equal. This assumption will be verified during the work. Task 3: Hydraulic Analysis We will develop a hydraulic model of existing conditions from field survey data, observations, construction plans, and topographic maps. This hydraulic model will be analyzed to determine the existing and ultimate runoff floodplain to analyze problem areas (erosion, and flooding). Task 4: Suggested Solutions We will develop alternative solutions that will address the problem areas identified in Task 3, and what would be needed to carry the fully-developed (ultimate) runoff, if different. These solutions will be analyzed by hydraulic modeling techniques. Task 5: Report and Presentation: We will prepare a report containing appropriate graphs and charts that describe the results qf this amendment to our study. This report will be presented and explained to staff~ ~-k~ ~ TIME SCHEDULE We will complete this amendment in two weeks from the date of the contract agreement. This will not change the timing for our original contract. This time does not allow for unforeseen delays in obtaining data. We are available to proceed upon authorization. FEE AND BILLING We will accomplish these amended services outlined in Tasks 1-5 for a lump-sum fee as shown below: Task 1: $1,705 Task 2: 185 Task 3: 850 Task 4: 2,300 Task 5: 1.100 TOTAL $ 6,140 Invoicing is monthly, typically mid-month for the previous month's services, and payment is due within 30 days of the date of the invoice. Monthly Lump Sum invoicing is an estimated percent complete of services. This fee will not be exceeded without prior City approval and amendment to the contract. Mr. Russell Doyle, P.E. - 3 - February 1, 1990 CLOSURE In addition to the services set forth herein, our agreement shall include, and shall be subject to the Special Coppell Standard Provisions attached hereto and hereby incorporated herein. The term "the client" as used in the attached Special Coppell Standard Provisions shall refer to the City of Coppell. Please return a signed copy of this agreement to our office to indicate your approval and authorization to proceed with this project. Very truly yours, KIMLEY-HORN AND ASSOCIATES, INC. Ronald W. Morrison, P.E. Senior Hydrologist /rwm Attachment: Standard Provisions (Coppell) Agreed to this ? day of ~g , ,, ?~wf, 1990 CITY OF COPPELL By: Title: lc ./~ ~ . STREET & HOUSE NUMBER ~E~,L SCHOOL 6O0 6O4 612 616 624 628 632 6O5 6O9 613 617 621 625 629 633 637 641 DOVE CIRCLE 7OO 701 704 NAMM TELEPMONE NUHBER Mr. & Mrs. Devnis Coburn Mr. & Mrs. Da1 Dunham Mr. & Mrs. Tom Fitzgerald Mr. & Mrs. Joe Antou Mr. & Hrs. Clifton Johnson Mr. & Mrs. Dennis Holmes Mr. & Mrs. Don Jones 393-3759 393-2697 462-7823 462-1101 462-1341 /'Mr. & Mrs. Chas Storey ~/Mr. & Mrs. Jeff Kretchmer Mr. & Mrs. Patrick Fraser /Mr. & Mrs. Robert O'Connell /Mr. & Mrs. Frank Brown /Mr. & Mrs. Frank WoJie Mr. & Mrs. Jerry Niederkorn ~/Mr. & Mrs. James Kearns /Mr. & Mrs. Lee R~chardson Victoria Chien Chao ~/Mr. & Mrs. David Greer unlisted 393-0225 462-1856 393-1714 462-1813 393-1851 462-1661 393-7095 462-0774 462.-0738 ~Mr. & Mrs. P.J. Rodriquez ~/Mr. & Mrs. Peyton Weaver ~/Mr. & Mrs. Charles Cotten 462-8513 462-0552 393-1792 602 606 610 614 618 622 702 706 HAWK COURT 5OO 4OO 3OO MEADOWVI EW 610 614 618 622 626 630 634 638 642 S. MOORE 380 ~/~r. & Nfs. Brett Archer dMr. & Hrs. Laurence Fray~e Hr. & Mrs. Bruce Wilcox Mr. & Mrs. Dean Eyberg w/Mr. & Mrs. Mike Barton ~Mr. & Mrs. Jerry O'Pry ~Hr. & }irs. Nasser Boukadoum ~//Mr. & Hrs. John Damuth ~/Mr. & Mrs. Stuart Myers .~r. & Mrs. Jim Sharer w/~r. & Mrs. Lee Link //Mr. & Mrs. Harney Snow ~//Mr. & Mrs. Brad Karustedt w//Mr. & Mrs. Howard Herrington /Hr. & Mrs. Bill Maxwell ~//Mr. & Mrs. Jesse Younsker ~/Mr. & Mrs. Pliny Gals v 'Mr. & Mrs. Frank Heath dMr. & Mrs. James Hoverson Mr. & Mrs. Ben Harek JMr. & Hrs. Chris Cagle 462-1366 393-1334 393-5111 462-7762 462-7951 471-2007 393-2719 462-8116 462-9418 393-2600 462-1945 462-8989 462-7788 393-1598 393-0435 462-0630 393-0065 393-0720 462-7265 393-1660 471-1005 .VILLAWOOD 6O5 609 613 617 621 625 629 633 VILLAWOOD CIRCLE 4O0 500 6OO 700 800 9OO Mr. Mr. dMr. ~/Mr. /Mr. ~/Mr. Mr. JMr. ~Mr. ~Mr. Phll~Ortiz & Mrs. Robert Gersten & Mrs. Kern Ormand & Mrs. Mike Clements & Mrs. Ron Fuller & Mrs. Jeff Browm & Mrs. Rodney Grobowsky & Mrs. Daniel Rabon & Mrs. Ron Potter & Mrs. Tom Barnes & Mrs. Raymond Pazzillo & Mrs. Tom Christopher & Mrs. Tom Kincaid & Mrs. Louis Crump unlteted 462-1620 462-8620 462-1380 393-2382 393-2288 462-8889 unlisted 393-0005 393-7203 393-1872 393-1994 462-0822 462-1992 MW/NWE/070389 COPPELL PUBLIC WORKS DATE: TO: F~OM: RE: February 14, 1990 Steve Goram, Director of Public Works Russell Doyl~yEngineer NLWE - 2 Wee~S~udybyRon Morrison Tickler 2/14/90 This project is on schedule. We have a meeting scheduled with Ron Morrison on Thursday, February 15, 1990, which we will make up an agenda request sheet and provide you the report on Thursday, 2/15/90, as an agenda item to the City Council for their meeting on Tuesday, February 27, 1990. Tickler 2/21/90 RRD/bb NLWE2 . RRD February ]2, 1990 Mr. and Mrs. De~nts Coburn 600 Bethel School Coppell,.TX 75019 Dear Mr. and Mrs. Coburn: The first phase of the exhaustive city wide drainage study of the nine creek tributary in Coppell is soon to be completed. This first phase of the study is in Northlake Woodlands East north of Bethel School, west of Hawk and south of Villawood. It will be completed and presented to the Coppe]l City Council at our regularly scheduled meeting of February 27, 1990. This study ~s being done by Kimley-Horn and Associates, Inc., a reputable engineering, planning, and surveying firm. According to city staff, this report "will determine the existing flood plain and provide recommendation for improvements to correct current problems as well as accommodate any further additional storm water flows. The results of the study will provide guidelines to any adjacent landowner if they want to do improvements along the creek." Further, after exhaustive research By the sixty-seven member citizen task force known as the Bond Committee, the City Council, by unanimous vote, has called for a Bond Electiou on March 4, 1990 based on citizens recommendations in this community. There will be nine propositions that will be voted on ~ndividually, with one of them being Drainage Improvements. It calls for $800,000 in funds earmarked for drainage improvements, $244,000 of which is to facilitate private landowners in their drainage improvements, with a degree of emphasis being placed on the Northlake Woodlands East situation. The Council will encourage questions from the audience at our February 27, 1990 meeting. However, due to time restraints because it is a regular City Council meeting, I may not be able to allow everyone to speak. Therefore, Jf more discussion is necessary, then some future date may be set in order for citizens and staff to communicate. Thank you for your patience as you have waited for the completion of this study. Hopefully, the study will be exactly what we have all been waiting on to help find solutions to your particular drainage problem. Sincerely, Mark Wolfe, Mayor cc: City Council Alan D. Ratliff, City Manager ENVELOPES/NWE MW0689(Pg.20.I) ALBERT H. HALFF ASSOCIATES, INC. ENGINEERS · SCIENTISTS * SURVEYORS DALLAS * ARLINGTON · CHICAGO · FORT WORTH July 31, 1989 P. 1008.89.2458 Mr. Russell Doyle, P.E. City Engineer City of Coppell 255 Parkway Blvd. Coppell, Texas 75019 Re: Northlake Woodlands East, Drainage Study - Phase I Dear Russell: We are pleased to submit this proposal for special hydraulic studies to evaluate existing flood plain and erosion problems of streams draining the Northlake Woodlands East area in Coppell, Texas (see attached map). The problems include the following: 1) 2) 3) 4) 5) 6) 7) Erosion just downstream of Moore Road Erosion just upstream of Bethel School Road Erosion at drainage flume from Villa Wood Lane General shallow ponding along the stream General poor water quality along the stream Stream channel and overbank maintenance Other stream or drainage problems that arise during the study as a result of the reconnaissance or citizen input. The following scope of work is necessary to develop solutions to the above problems. Estimated budgets are also shown. TASK ESTIMATED BUDGET A. Data Collection $251 B. Stream Cross Section Surveys 1,030 C. Field Reconnaissance 604 D. Hydrology 1,504 E. Hydraulics 1,769 FIRM'S CAPABILITIES Albert H. Halff Associates, Inc. has offices in Dallas, Fort Worth, Arlington, San Antonio, and Chicago consisting of approximately 200 employees, including 105 planners, engineers and scientists. Our technical teammembers hold over 131 degrees from 50 universities, and offer over 1000 years of cumulative engineering and planning experience. Our personnel strive to maintain our position in the forefront of engineering and planning, through advanced education, participation in professional societies, technical instruction, and the authorship of research articles and presentations. A. Size, History and Overall Experience of the Firm Albert H. Halff Associates, Inc. is a minority-owned consulting engineering firm with thirty-nine years of experience. The firm is currently ranked 365th in ENR's list of the top 500 design firms in the United States, and is headquartered in Dallas, with branch offices in Fort Worth, Arlington, San Antonio, and Chicago. Since its beginning in 1950 with two employees, the firm has grown to approximately 200 employees, includingz 41 Civil. Engineers* 10 Transportation Engineers 21 Hydrologic & Hydraulic Engineers** Inspectors 2 Chemical Engineers 3 Mechanical Engineers 3 Electrical Engineers 6 Structural Engineers 6 Environmental Engineers 5 Environmental Scientists 5 Landscape Architects 1 Geologist 2 Planners 1 Specification Writer 3 Construction 32 Surveyors 2 Computer System Analysts 6 Computer-Aided-Design/ Drafting (CADD) Operators 28 Administrative and Clerical Staff 24 Draftsmen/Technicians TOTAL 201 Ten civil engineers and two survey coordinators are Registered Public Surveyors. Three hydraulic engineers are Registered Irrigators. Members of the staff have published 150 technical papers, hold 88 licenses of engineering registration and 14 patents, and include officers in several state and national professional societies. A key to Halff Associates' growth has been our commitment to evaluate and adopt new technologies early in their development rather than taking a wait-and-see approach. This progressive philosophy is evidenced by our purchase of an IBM 1130 computer in 1969, a time when mechanical calculators were used in most design offices. Our computer facilities are continuously evolving to provide ,our engineers and environmental staff the latest technology to extend their productivity and improve their accuracy. Halff Associates was the first civil engineering firm in Dallas to equip every staff engineer with an interactive computer terminal, thereby fully integrating the use of computers in day-to-day design. Six of the firm's twelve Intergraph CADD stations have also been assigned to engineers for direct use in the design process. Our recently acquired ERDAS satellite image scanner is currently being used to evaluate environmental impacts for major construction projects. A significant factor in the success of Halff Associates has been our constant philosophy of staff development through continuing education. Our staff members are our greatest resource, and we protect that resource in a rapidly-changing industry through continued training. An example of this training is our in-house TAGER studio. This facility allows our engineers to participate in graduate levl course-work from Dallas area universities over live television broadcast. Additionally, a series of weekly in-house seminars update and train our personnel in the latest engineering design, surveying, and construction techniques, computer use, hydraulics, and other technical subjects. Our seminars are videotaped for later use by new staff members and for future reference by engineers. Halff Associates has been a leader in flood plain management, watershed planning, hydraulics, hydrology, and drainage design in Texas. Our method of comparison of alternatives in our Peaks Branch flood control report served as the state-of-the-art model for the text, Multiobjective Decision Analysis with Enqineerinq and Business Applications (1982). The firm uses a wide variety of hydrologic and hydraulic techniques and programs to determine design flood discharges and elevations. Design storm and flood elevation discharges have been established in studies of fourteen major watersheds in Dallas County. Techniques that were applied and refined in these studies resulted in a publication entitled "The Hydrology and Hydraulics of Flood Plain Studies." The firm has also determined flood discharges and elevations for Federal flood insurance studies in 15 Texas cities, on watersheds with areas ranging from one square mile to several thousand square miles. Our personnel have developed wide range expertise in the use of flood frequency techniques for both urban and rural watersheds. The firm stresses: (1) familiarity with municipal, Corps of Engineers, Hydrologic Engineering Center, Federal Emergency Management Agency, U. S. Weather Bureau, U. S. Geological Survey, and other authority's technical procedures; (2) thorough inspection and mapping of watersheds; (3) accurate and efficient flood plain delineation procedures, using HEC-1, HEC-2, and other programs; (4) formulation of innovative and practical flood protection plans; (5) client input and consultation in the study process; (6) clear graphics and use of laymen's language in reports; and (7) application and refinement of state-of-the-art advances. Halff Associates has facilities which make the firm highly-qualified to develop watershed management plans. We have one of the largest computer facilities of any A/E within the metroplex. Additionally, we have two Computer-Aided- Drafting/Design systems, consisting of twelve work stations. The CADD system permits rapid revisions to drawings, provides outstanding quality drafting, accepts digitized topographic data, and provides flexibility not possible with manual drafting. The engineering works by the firm include: o o o o o o o o o o o o o o o o Airports Highways and Bridges Wastewater Collection and Treatment Industrial Waste Treatment Railroads Dams and Levees Office and Industrial Park Development Hydroelectric Power Site Development Flood Plain Management Industrial Process Design Land Reclamation Water Supply: Treatment and Transmission Storm Water Systems Water Resources: Hydrology and Hydraulics Distribution Systems Analyses The services offered by the firm include: o o o o o o o o o o o o o o o o Planning and Studies Remote Sensing Land and Pre-Construction Surveying Landscape Architecture Civil Engineering Environmental Studies Structural Engineering Solicitation and Analysis of Bids Electrical Engineering Construction Services Mechanical Engineering Computer Modeling Chemical Engineering Research and Development Environmental Engineering RCRA Closure Plans Albert H. Halff Associates, Inc. will provide planning, flood plain management, hydrology and hydraulic engineering support, surveying, land use inventory and assessment, as well as remote sensing, CADD, and computer services. B. Examples of Watershed Management, Flood Plain or Storm Water Management Plans: Following is a partial list of projects performed by Halff Associates. CITY OF ALLEN GREENBELT/LINEAR PARK STUDY Study Cost: $110,000 Client: City of Allen, Texas Reference: Mr. Mark Thornton (214) 727-9171 Status: Study completed in October, 1986. The City Council approved the study and has incorporated the document as an amendment to the City's Comprehensive Master Plan. The plan is being implemented and is prompting revision of several ordinances and criteria governing the planning and use of the City's flood plains. Project Description: Halff Associates prepared an environmental inventory, flood plain management plan and recreation plan for the major tributaries in Allen, Texas. The upper Rowlett Creek watershed was studied to determine the future fully developed land use. A flood plain model was developed to correspond to the runoff generated from a 100 year flood event occurring on the fully developed watershed. The new flood plain was delineated on the city's topographic maps to evaluate flooding locations and plans were developed to eliminate the flooding sites. A recreation plan was developed for the 1300 acre flood plain, containing a continuous hike and bike trail, an equestrian trail, nature preserves, and active and passive recreation facilities. An implementation plan was developed which modified the development process and recommended the re-writing of ordinances relevant to flood plain development. FIVEMILE CREEK FLOOD PLAIN MANAGEMENT STUDY Study Cost: $349,000 Client: City of Dallas Reference: M_rs. To~ie McPherson (214) 948-4440 Status: Study completed in December 1976 The Water Resources Development Act of 1986 (signed November 17, 1986) authorizes Federal funds for construction. Project Description: The Fivemile Creek Flood Plain Management Study, prepared for the City of Dallas' Public Works Department, involved 49 square miles of flood plain along Fivemile Creek and its tributaries in southern central Dallas County. After detailed study of the hydrologic and environmental characteristics of the area, Halff Associates proposed channel improvements, a levee system, storm water retention basins, and a 22 mile parkway system, to promote the environmentally-safe use of available land. These improvements are designed to minimize damage to over 550 flood-endangered structures and to encourage the growth and development of the area to the benefit of over 157,000 residents within the Fivemile Creek basin. Fivemile Creek Pilot Channel Design Project: Halff Associates designed a 540-foot pre-stressed concrete beam railroad bridge over Fivemile Creek, including the realignment of the existing Missouri- Kansas-Texas Railroad tracks. The project also included the design of 16,000 feet of 220-foot wide channel for Fivemile Creek, from Bonnie View Road downstream to the Southern Pacific Railroad bridge and the relocation of 4,500 linear feet of Youngblood Road. The Fivemile Creek channelization project is part of a flood plain management system for southeast Dallas, developed for the City of Dallas by Halff Associates. The approximate cost of work was $4,000,000. A summary of the Fivemile current status is shown. RECOM~.NDATION IMPLEMENTATION COSTS PROJECTED ACTUAL STATUS A. Total Stream Flood Retarding Basins Parkway Plan $1,680,000 N/A $9,334,000 N/A Preliminary Design C~,~lete, Bonds Voted 11/85 B. Lower Five Mile Creek Levee Plan Pilot Channel C. Middle Five Mile Creek Lake Plan $15,500,000 N/A N/A $4,000,000 $12,300,000 N/A Pilot Channel and Railroad Bridge Designed by Halff Associates; Construction Complete The Water Resources Development Act of 1986 signed Nov. 17, 1986 authorized Federal funds for the Five Mile Creek flood control project. D. Upper Five Mile Creek Overflow Swale $ E. Ledbetter Branch Flood Control Berm $ F. Woody Branch Channel Rectification $ 102,000 N/A 10,000 N/A 20,000 N/A FLOOD PLAIN DELINEATION AND EROSION CONTROL ON LOWER WHITE ROCK CREEK Study Cost: $ 50,000 Client: City of Dallas Reference: Mrs. Tommie McPherson Mr. John King Mr. Bob Thrash (214) 948-4560 Status: Study Completed in October, 1985 Project Description: The Lower White Rock Creek Study involved extensive reviews of flood-plain management alternatives and environmental/land use impacts on the project area. The development of management alternatives was based on a fully-developed land use condition of the White Rock Creek watershed. The most economical solution for flood plain management, construction of a large straight channel, would have destroyed Tenison Municipal Golf Course and Park, and the adjacent open space environment. A detailed formula was devised to classify and quantitate proposed improvement alternatives. The formula assigned a numerical value and a weight factor to the environmental/hydraulic achievements of the various options. Based on this evaluation, a specific environmental rating could be assigned to each option, aiding in the final consideration and selection of the recommended alternative. A channel dam and diversion swale were proposed, with miscellaneous minor improvements within the golf course and park. The proposed improvements achieved the control of storm-flow erosion within the park, while maintaining land use and aesthetics. The consideration of user safety, land use, and park aesthetics resulted in the wholehearted support of park users and other interest groups. RECOMMENDATION IMPLEMENTATION COSTS PROJECTED ACTUAL STATUS Alternatives C and G West Side Swale Channel Dam Diversion Structure Erosion Control Sites TOTAL $ 950,000 $950,000 $ 489,000 N/A $ 70,000 N/A Designed and Constructed Preliminary Design Completed Preliminary Design Completed $ 950,000 N/A Preliminary Design Completed $2,459,000 PRELIMINARY DESIGN REPORT ON FLOOD PLAIN MANAGEMENT FOR LOWER PEAKS BRANCH Study Cost: $ 40,000 (1976) Client: City of Dallas Reference: Mrs. Tommie McPherson (214) 940-4440 Status: Study Completed in June, 1976 Project Description: Lower Peak's Branch is a major drainage channel located in a residential neighborhood east of Fair Park in South Dallas. Severe flooding has been experienced for a number of years in the Lower Peak's Branch area because of increasing development within the watershed which extends as far north as Mockingbird Lane. A Lower Peak's Branch report prepared by Halff Associates for the City of Dallas Public Works Department developed seven alternatives for flood control in the area and a desirability rating system to select the best alternative. The alternative selected by the City of Dallas includes channel improvements, three bridges, and a storm water diversion conduit to relieve flooding in the area. The Peaks Branch channel improvements include 8,000 linear feet of widening and concrete lining of the existing drainage channel. The channel improvements also include the reconstruction of the Lagoon, Spring and Frank Street bridges, and the Southern Pacific Railroad bridge over the old channel. The diversion conduit project includes the design of 8,440 linear feet of reinforced concrete double 12-foot by 12-foot box culvert with pre-cast box and slurry wall construction alternatives. The project requires the removal and replacement of 2,500 linear feet of State Highway 352 (3 lanes), the construction of a 900-foot long shoo-fly on the Southern Pacific Belt Line track, other railroad track replacement and utility relocations. The construction plans for the segment involving State Highway 352 include detour routes and traffic control signage designed to maintain two lanes of traffic open at all times during construction. The approximate cost of this project is $5,000,000 for the channel improvements, and $13,000,000 for the diversion conduit. RECOMMENDATION IMPLEMENTATION COSTS PROJECTED ACTUAL STATUS Channel Improvements $4,709,000 $5,000,000 Designed by Halff; Constructedby City of Dallas Diversion Conduit $13,000,000 $8,000,000 Halff designed diversion conduit and is currently conducting construction management. C. List of Relevant Studies Performed or Being Performed Halff Associates has conducted storm drainage studies, flood-plain management studies, storm drainage master plans, Flood Insurance Studies, and other related studies for governments and agencies throughout the Southwest. Recent studies include: City of Victoria and Victoria County Flood Insurance Studies for the Federal Emergency Management Agency Storm Drainage System Master Plan and Drainage System Improvements for the City of Richardson Flood Plain Management and Greenbelt/Linear Park Plan for the City of Allen, Texas Newton Creek and Ricketts Branch Flood Plain Management Study for the City of Dallas o A Comprehensive Drainage Study for the City of Hurst South Playa Drainage Study for the City of Lubbock and the Texas Water Commission Tenmile Creek Master Drainage Study for the City of Duncanville Storm System Improvements on South Mesquite Creek in Mesquite Upper White Rock Creek Flood Plain Management Study for the Cities of Dallas and Plano Rowlett Creek Flood Insurance Study for the Cities of Plano and Garland o Peaks Branch Channel Improvements for the City of Dallas o Central Business District Storm Drainage Study for the o o o o o o o o o o o City of Fort Worth Plan of Reclamation, Environmental Assessment, Levee and Pump Station Design for the Irving Flood Control District Section III in Irving Fivemile Creek Flood Plain Management Study for the City of Dallas Prairie and Elam Creeks Flood Plain Management Study for the City of Dallas Landscape, Drainage, and Groundwater Control Improvements on the Trinity River at the City of Dallas' South Side Waste Water Treatment Plant (also known as City of Dallas South Side Buffer Zone Project) Lower White Rock Creek Flood Plain Delineation and Erosion Control Study (through Tenison Golf Course) for the City of Dallas Turtle Creek Flood Plain Management Study for the City of University Park Cedar Creek Flood Plain Management Study for the City of Dallas Town Lake Preliminary Design Report for the City of Dallas Trinity Greenbelt Park Preliminary Design Report for the City of Dallas White Rock North Water Transmission Line Environmental Assessment, Public Surveys, and Presentations and Final Alignment Selection (through nine Dallas parks) for the City of Dallas Park and Open Space Master Plan for the City of Wilmer, for the Texas Department of Community Affairs and the U.S. Department of Housing and Urban Development Bachman Branch Flood Loss Prevention Study for the City of Dallas Browning and Slaughter Branches Flood Plain Management and Storm Drainage Study for the City of Dallas Plan of Reclamation, Levee and Pump Station Design for the Denton County Reclamation, Road and Utility District South Mesquite Creek Appraisal Report for the U.S. Army Corps of Engineers' Fort Worth District o Tenmile Creek Appraisal Report, Duncanville and DeSoto, Texas for the U.S. Army Corps of Engineers' Fort Worth District o City of Allen Flood Insurance Study for the U.S. Army Corps of Engineers' Fort Worth District o Dallas County Metro Flood Insurance Study (Units 3 and 5), totaling 342 miles of streams) for the U.S. Army Corps of Engineers' Fort Worth District Flood Plain Information Report on Maxwell Creek, Parker and Collin Counties, Texas for the U.S. Army Corps of Engineers' Fort Worth District Preliminary Flood Control Investigation - Delaware Creek and West Irving Branch, Irving, Texas for the U.S. A~-my Corps of Engineers' Fort Worth District Mauk Branch Storm Drainage Improvements for the City of Duncanville Bachman Lake Flood Plain Management Study for the City of Dallas Boggy Creek Channel Improvements and Hike & Bike Trails Through Two Existing Parks the The EQ/MitigationArea in Austin, Texas for the Corps of Engineers, Fort Worth District o Lake Wichita/Holiday Wichita Falls, Texas District Creek Channel Improvements in for the Corps of Engineers, Tulsa Bachman Lake Dam Gated Spillway Feasibility Study for the City of Dallas 1986/87 Indefinite Delivery Water Resources Planning Projects for the Fort Worth District Corps of Engineers and the Tulsa District Corps of Engineers South Side Flood Plain Designation Study and Evaluation of Bois d'arc Levee District for the City of Dallas Grapevine Creek Reclamation in the Cities of Coppell, Dallas, and Irving, Texas and Dallas County, Texas The above list of projects does not include numerous stormwater master plans, flood plain management studies, and channel improvement projects for private clients. PROP~SSIOI~L Pgl~Olflfl~ Halff Associates team combines a diversity of experienced personnel ready to undertake the challenging work offered by the City of Coppell. The key members of the flood plain management study team are listed below. A. Professional and Senior Personnel and Project Discipline PROJECT YEARS NAME ASSIGNMENT EXPERIENCE Dr. A.H. Halff, P.E., RPS Technical Advisor and 49 Watershed Planning Jose I. Novoa, P.E., RPS Technical Advisor and 24 Storm Water Management Walter Skipwith, P.E. Project Manager/ Flood Plain Management 15 Dick Westsmith, P.E. Computer Applications/ 18 Hydraulics David Morgan F.M. Carroll, Environmental Planning/Landscape Architecture 12 13 B. Key Personnel and Major SuppOrt - Brief Resumes Mr. Walter Skipwith's, P.E., B.S.C.E., M.S.C.E., Flood Plain Manaqement/Hydraulics and Vice President of Halff Associates, accomplishments in hydrology and hydraulics include: (1) co-authorship, with Dr. W. Moore, of Evaluation of Urban Runoff by Watershed Simulation, for the Hydrologic Engineering Center in Davis, California, (2) paper presentations to the American Society of Civil Engineers analyzing watershed simulation in relation to urban runoff, and hydraulic and hydrologic methods of delineating flood plains, (3) preparation of hydrologic, hydraulic, and water-quality models for 8 Texas waterways and 1 proposed lake, (4) hydraulic design for Phase I General Design Memorandum, Beals Creek, a flood-protection project, (5) design of a storm-water retention basin, (6) coordination of hydraulic engineering for Units 3 and 5 of the Dallas County Metro Area Flood Insurance Study, (7) hydrology andhydraulics for FIA flood-insurance studies in 13 communities in Texas, (8) flood-control and pump-station design for 8 projects covering over 500 acres, (9) hydraulic design for sump-extension improvements within the Irving Flood Control District Section III, and (10) design of site facilities at Park West Office Community, including site lighting, tennis and basketball courts, horseshoe pits, sailboat marina, and over 2 miles of jogging trails. Mr. Skipwith is currently overseeing the completion of drainage master plan studies on White Rock Creek in Dallas and Plano, Texas, and Rowlett Creek in Garland, Texas. Ms. Jean Hansen, P.E., HydroloqT/Flood Plain Management, joined Halff Associates in January 1985 and has worked on several commercial development and municipal improvement projects. Her experience includes the design and preparation of construction plans for paving, drainage, sanitary sewer, water and underground electrical conduit. Some of her representative projects are: 1) design and preparation of construction plans and specifications for Park West Four, a 100-acre commercial site in Irving, Texas; 2) design and preparation of construction plans and specifications for improvements to MacArthur Boulevard from Valley View Lane to IH-635 in Irving, Texas including paving, drainage, and utility crossings; 3) design and contract administration for 942 linear feet of 8E6 electrical conduit including 580-feet of tunelling under IH-635 in Farmers Branch, Texas; and 4) design and contract administration of interim paving, drainage, and water service for marketing purposes, Park West Four, Irving, Texas, contract included the installation of an ongoing research project to monitor subgrade movements in highly expansive clay soils. Ms. Hansen has also been involved in several hydrologic and hydraulic studies for the White Rock Creek basin in Plano, Texas. These studies included the preparation of a flood insurance study in which flood plains and floodways were determined for the Federal Emergency Management Agency and a Flood Plain Management study for the City of Plano, Texas. Mr. Dick Westsmith, P.E., B.S.C.E., M.S.C.E., Computer Applications/Hydraulics, has been with Halff Associates since 1978 as an engineer specializing in hydraulics and hydrology. Among other projects, he has: 1) designed a flood control channel on lower Fivemile Creek in Dallas, Texas, as well as drainage diversion, drainage structures, right-of-way alignments, relocation of utilities, relocation of railroads, weir design for drop structures, and cost estimation; 2) performed flood studies of West Texas cities for the Federal Emergency Management Agency. This project included coordination of field crews, identification of critical cross sections, verification of field data, preparation of zone maps and final maps, and reconnaissance to determine channel roughness and evaluate structural improvements in flood plains; 3) prepared a feasibility study for a pilot project to use modular, float-in powerhouses on the McClellan-Kerr Arkansas River navigation system for the Department of Energy, including preparing cost estimates, analyzing benefits of conventional and modular designs, and coordination of work efforts of three engineers and two technicians in preparing the final report; and 4) design storm sewer and detention requirements for local communities. Mr. Westsmith is knowledgeable in FORTRAN computer language programming, and has developed numerous computer programs to facilitate data presentation. He is familiar with HEC-1,HEC-2, ILLUDAS, HEC-5, HYDUR, RMA1 and RMA2 programs, among others, and has formulated an urban hydrology program for examining bypass street flows, surcharged drainage systems and soil infiltration. This software has been applied to several watersheds in the Dallas/Fort Worth area with excellent results. Prior to joining Halff Associates, ~_r. Westsmith physically modeled the hydraulic behavior of the Winnipeg River using a Froude model. His graduate work included specialized courses in riverine engineering and physical statistical hydrology. His masters research dealt with the hydrologic cycle and with water movement and storage in rural areas. Ms. Sophia Iliadou, Hydraulics, has a Bachelor of Science degree in Civil Engineering from Texas A&M University. Ms. Iliadou's scholastic background includes extensive work in hydraulics and hydrology. Ms. Iliadou's experience with Halff Associates' Water Resources Department includes several hydrology and hydraulic analysis projects for Flood Insurance Studies, Flood Plain Management Studies, and development design for such clients as the Corps of Engineers, City of Dallas, City of Plano, and City of Garland. Specific projects include the following: 1) project engineer for the City of Garland Flood Plain Management study, 2) hydraulic engineer for Southside Flood Plain Designation study, 3) hydrology and hydraulics for Rowlett Creek Flood Insurance Study update, 4) hydraulic engineer for Flick-Reedy flood plain reclamation projects in Chicago, Illinois, and 5) design engineer for proposed North Garland Avenue culvert over Stream 213 in Garland, Texas. Ms. Iliadou has attended hydrologic and hydraulics short courses and has experience with hydrologic and hydraulic models such as NUDAT.LAS, HEC-1, HEC-2, and TR20. Dr. Albert H. Halff, Ph.D., P.E., Technical Advisor and Watershed Planninq, has three decades of engineering design and construction experience, and has served as an expert witness in major flood plain damage and land condemnation cases. Under his supervision, HalffA~sociates has completed reports and designs for numerous municipal, state, and Federal agencies. He directed the Bachman Branch study following a disastrous 1966 flood. This 1968 report presented alternative flood control strategies while recommending preservation of a scenic flood plain. Public interest in this report led the city to initiate flood plain studies and planning for all Dallas streams. The firm subsequently designed a flood plain delineation model for the city, tested and refined the model, trained city personnel in its use and applied it in routing and planning for flood control for numerous Dallas streams. The firm's Fivemile Creek Plan has promoted revitalization of an entire section of Dallas. The Peaks Branch Plan has been praised for innovations in comparing flood control options, and our method of comparison of alternatives in the report served as the state-of-the-art model for the text, Multiobjective Decision Analysis with Enqineerinq and Business Applications (1982). Dr. Halff's other projects include: 1) design of drainage systems for municipalities and private developers, including a pioneering open system that enhanced the appearance of a major industrial park, 2) design of the first Texas industrial retention basin for flood peak reduction and treatment of storm water, 3) a feasibility report for Town Lake on the Trinity River within the Dallas floodway system, and 4) design of the Trinity Greenbelt Park within the Trinity River floodway. Dr. Halff has authored numerous articles, and has lectured at the Hydrologic Engineering Center in Davis, California. He is active in metroplex community life and has contributed to solutions of our community's problems. He is currently the past president of the Dallas Chapter of the Texas Society of Professional Engineers and the 1986 recipient of the national Samuel Arnold Greeley Environmental Award from the American Society of Civil Engineers. Mr. David Morqan, Environmental Scientist and Planner, Vice President of Halff Associates, provides the environmental planning and assessment for Halff Associates' projects. He oversees the environmental planning of many construction projects by carefully evaluating factors such as erosion, surface and groundwater quality, air quality, noise levels, energy production and consumption, land use trends, historic and archaeological sites, and plant and animal communities including threatened or endangered species. Mr. Morgan performed an eutrophication assessment for the proposed Millican Lake on the Navasota River for the Corps of Engineers. He has also assisted in the collection and analysis of water quality data for the City of Dallas's proposed Town Lake. Mr. Morgan has completed numerous environmental impact assessments related to flood plain management, some of which are; Beals Creek for the U. S. Corps of Engineers, Cedar Creek and Tributaries, Prairie Creek and Elam Creek, Five Mile Creek and Tributaries for the City of Dallas, as well as the Irving Flood Control District Reclamation Project for the Irving Flood Control District No. 3. The work for these projects entailed: (a) field collection and classification of flora and fauna, (b) water quality evaluation, (c) open space inventory and planning, (d) land use master planning, (e) evaluation of flood control alternatives, and (f) recommendation of flood plain management plan. Mr. Morgan recently received the 1986 Samuel Arnold Greeley Award from the American Society of Civil Engineers, for his part in the disposal of five-million gallons of oil sludge for Trammell Crow Company in Dallas, Texas. He assisted in the environmental planning and assessment of the final alignment of an 84-inch water transmission line through the White Rock Creek flood plain and fourteen public parks and inventoried and assessed over 3000 significant trees. The water line was designed around significant stands of trees rather than destroying them. Mr. Morgan recently completed a Greenbelt/Linear Park Study for the City of Allen, Texas, which included an environmental inventory, flood-plain management and recreational plan for the major tributaries within the City. Mr. Morgan provides input and assistance on many of the firm's projects to insure compliance with local, state and Federal regulations. His environmental expertise insures a carefully-planned project which is compatible with the environment. Mr. F.M. Carroll, ASLA, Landscape Architect, has over twelve years of diverse experience encompassing development management, project management, landscape design, planning, construction and profit center development. Mr. Carroll's expertise includes client/consultant/contractor/public entity coordination, design, planning, budget development and forecasting, proposal preparation and implementation. Since joining Halff Associates, Mr. Carroll has provided planning and design services on projects that include: (1) site placement and layout of Dallas/Fort Worth's Superconducting Super Collider proposal to the State of Texas; (2) development of environmental and corridor treatment concepts for the State Highway 114 North Beltway "Justification Study"; (3) design aid and construction inspection of a three-mile (200 ac.) buffer which develops a continuous wet land and nature habitat, while surrounding Dallas' Southside Wastewater Treatment Plant; (4) land and thoroughfare planning for an 1800-acre industrial airport park in north Fort Worth, and (5) land planning thoroughfare layout, and land parcelization studies for 2,400 acres adjoining the new North Beltway in north Fort Worth. Prior to joining Halff Associates, Mr. Carroll was Director of Development Management and San Antonio Office Manager for PeckhamInc. Land Planners/Landscape Architects. His projects have included: (1) design of signage, medians, and screening for Interchange Park, a 70-acre office park; (2) design of entries, medians, a recreational lake, greenways, signage, and a new state highway for Westlakes, a 1000-acre mixed-use development; (3) Encino Park, an 1800-acre mixed-use development; (4) design of overall landscape planning, medians, and first phase landscaping for the University of Dallas; and (5) design of greenway and floodway enhancement, thoroughfare enhancement and private business landscaping for Mercantile Center, a 1600-acre business and industrial park. Mr. Carroll was the senior landscape architect for the Fort Worth Stockyards Economic Redevelopment Program, responsible for developing an economic and physical strategy plan for redevelopment of Fort Worth's Historic Stockyards District. This project included master planning, and design of pedestrian and floodway enhancement and design of infrastructure improvement, including utilities, sewer, storm sewer, and roads, for historic brick street reconstruction. MEMORANDUM July 27, 1989 TO: FROM: SUBJECT: REF: Mark Wolfe, Mayor Alan D. Ratliff, City Manager ~~ North Lake Woodlands East Drainage Meeting Held 7-18-89 Follow-up Staff Meeting Held 7-27-89 Attendees: Russell Doyle, City Engineer Frank Trando, Deputy CM/Finance Director Per Birdsall, Streets Superintendent Howard Pafford, Water Superintendent Troy Glidewell, Fire Marshal Alan D. Ratliff, CM Larry Jackson, CA The purpose of the follow-up meeting was to information that was presented at the 7-18 drainage with citizens. PROBLEMS A. Erosion 1. 2. 3. 4. 5. review meeting Telephone, electrical & TV cable exposed Storm sewer/sanitary sewer lines exposed Bank & side wall of channel eroded Tree roots exposed Fences undermined B. Brush and Debris C. Flooding of Floodplain Area and Higher Ground D. Ponding & Mosquito Problems E. Foul Smell Inaccurate Maps Depicting Property Lines and Easements II. ACTION TO BE TAKEN: ae Specific problem identification with maps and photos indicating specific location of each of the above problems. Be Engineering study to obtain maps/photos and additional information, recommended solutions with estimated costs, detailed plans developed for recommended solutions after Council determination. 1. Basic study $10,000 2. Survey $15~000 Total $25,000 Independent engineering firm needed to conduct study to ensure objectivity and acceptance by citizens. III. POSSIBLE SOURCE OF FUNDS FOR STUDY A. Balance of CIP funds General Fund - contingent on reimbursements from other sources c. Issuance of C/O's D. TRA Financing IV. LEGAL QUESTIONS A. Liability of City for Drainage Problem Legal ability to enter on property for cleanup and removal of fences, etc. C. Legal perimeters of creating drainage district V. ASSIGNMENTS City Manager will prepare an agenda item for the August 8th City Council meeting to obtain authorization from Council for the City Manager/City Engineer to seek outside engineering firm to perform the study with a maximum cost designated. Frank Trando - provide memo on financial aspects; methods and sources of funding. C. Larry Jackson - provide memo to legal questions. Russ Doyle - provide engineering study scope and budget estimates. Ee Troy Glidewell - provide historic information about action taken last year and will perform field inspection and video tape area. Linda Varonich - provide memo as to action she has taken since the meeting and her commen~s and recommendations about health hazards. • , _ , . . . - . 4 .1..._ _, 4 A . _ - - - _ - -. ---, 5 - -; 111 - ' - • _ .. , - % . -; . _ =-.----_-_-:, _ _ _., _ ..,4,_ 0.., _.,_ 0 . 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