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HomeMy WebLinkAboutItem III (C) Approval and Authorization for Mayor and City Clerk to Execute Work Order No. 8 with PEC for Storm Water Master Plan-Starke Lake/Lake Olympia Drainage Basin Study AGENDA 5-17-94 Item III C • • _1_ a ►„y 0a © ��yrf*of coon ,` JAMES W.SHIRR,P.E. ! — CITY ENGINEER/UTILITIES DIRECTOR 150 N.LAKESHORE DRIVE•OCOEE,FLORIDA 34761 (407)656-2322 MEMORANDUM DATE: May 4, 1994 TO: The Honorable Mayor and Board of City Commissioners FROM: James W. Shira, P.E. City Engineer/Utilitie Director SUBJECT: Stormwater Management Master Plan - Work Order No. 8 Starke Lake/Lake Olympia Drainage Basin Attached is a proposal from PEC for the work involved to complete the Starke Lake / Lake Olympia Drainage Basin Study portion of the Master Drainage Plan, as well as a proposed work order to authorize them to proceed. Exhibit "A", Scope of Services, is a detailed list of the work to be accomplished. PEC proposes to complete the work involved by December 30, 1994 for a not-to-exceed fee of $81,715.00 I recommend that the City Commission approve Work Order No. 8, and authorize the Mayor and City Clerk to execute Work Order No. 8 for a not-to-exceed fee of $81,715.00. vip6opocs,siamworioamAym THE PRIDE OF WEST ORANGE WORK ORDER FOR ENGINEER'S SERVICES AGREEMENT WORK ORDER NO. 8 PROJECT: Master Drainage Plan (Starke Lake/Lake Olympia Drainage Basin Study) ENGINEER: Professional Engineering Consultants, Inc. Execution of the Work Order No. 8 shall serve as authorization of ENGINEER to provide professional engineering services as described in Attachment "A" which is attached hereto and made a part hereof. ENGINEER shall provide said service pursuant to Work Order No. 8, its attachment and that certain Agreement of June 2, 1992 between CITY and ENGINEER which is incorporated herein by reference as if it had been set out in its entirety. Whenever the Work Order conflicts with said Agreement, the Agreement shall prevail. TIME FOR COMPLETION: The work authorized by this Work Order shall be completed by Friday, December 30, 1994. COMPENSATION: The CITY shall compensate the ENGINEER on an hourly basis with a not-to-exceed amount of Seventy-Nine Thousand Nine Hundred Sixty-Five Dollars ($79,965.00) for the professional services required under this Work Order. An additional amount, not to exceed One Thousand Seven Hundred Fifty Dollars ($1,750.00) shall be paid as direct reimbursable charges for copying and reproduction expenses. Engineer shall perform all work required by this Work Order; but, in no event shall ENGINEER be paid more than the fixed fee set forth above without authorization of the CITY. IN WITNESS WHEREOF, the parties hereto have made and executed this Work Order on this 17th day of May, 1994 for the purpose stated herein. ATTEST: PROFESSIONAL ENGINEER NG CONSULTANTS, INC. -7/}/4/'7 .Gd By: Q Q . acuLt 1 c ow✓ / R. Craig Batterson, President Date: WI ou S, 19914 ATTEST: BOARD OF CITY COMMISSIONERS CITY OF OCOEE, FLORIDA By: S. Scott Vandergrift, Mayor Date: For the use and reliance of City of Ocoee only. Approved as to form and legality this day of , 1994. City Attorney ii ATTACHiVIENT "A" SCOPE OF SERVICES WORK ORDER NO. 8 STARKE LAKE/LAKE OLYMPIA DRAINAGE BASIN STUDY OBJECTIVE The purpose of this project is to improve the water quality of Starke Lake and Lake Olympia and reduce and/or eliminate localized flooding. The majority of urban development within the 880 acre Starke Lake Basin provides no treatment of stormwater runoff, specifically the area located west of Starke Lake. The 499 acre Lake Olympia Basin, and the 220 acre subbasin south of White Road, is either undeveloped or consists of recent developments with stormwater ponds. This study will entail the analysis of the existing drainage system and identification of problem areas with respect to level of service, water quality impacts, or historical flooding conditions. This study will then involve the design of stormwater management improvements within the Starke Lake and Lake Olympia basins to improve the quality of the receiving water bodies. The Starke Lake/Lake Olympia Drainage Basin Study and address the following objectives: 1. To develop an inventory of the existing stormwater drainage facilities, delineate the watershed drainage basin, and identify other related hydrologic parameters; 2. To evaluate existing and proposed stormwater drainage systems and identify problem areas and deficiencies with respect to water quality and flooding; 3. To establish a level of service criteria for the various components of the stormwater drainage system; 4. To develop and apply a stormwater management computer model capable of simulating storm runoff under existing land use conditions within the drainage basin; 5. To evaluate alternative management plans to meet the established service levels based on any deficiencies identified through data collection and modeling; 6. To generate a Master Drainage Plan with established improvement priorities and engineering and construction cost estimates; and 7. To develop a Capital Improvement Plan based on system requirements identified in the Master Drainage Plan. 1 The following scope will outline the steps required to complete Work Order No. 8 and meet the aforementioned objectives. I. DATA COLLECTION The Engineer shall review all pertinent data as it relates to the Starke Lake/Lake Olympia Drainage Basin. The Engineer shall perform the following tasks: a. The Engineer will review the following information: • Construction Plans and Drainage Calculations for Sleepy Harbor Subdivision, Sleepy Harbor Condos, Veronica Place, Whitehill, etc. • Permit Application for Lake Olympia/Starke Lake Control Structure prepared by Orange County Engineering Department, dated September 1985; • Roadway plans for Silver Star Road, White Road, and Clarke Road; and • St. Johns River Water Management District aerial topographic maps. At the conclusion of the data review, the Engineer shall perform sufficient site inspections to identify existing stormwater facilities (i.e. ditches, inlets, collection systems), existing land-use, drainage patterns and drainage subbasin boundaries. b. Based on existing and proposed developments, FDOT drainage basin maps, site inspections, and existing SJRWMD and Orange County topographic maps, the Engineer shall delineate the drainage basin and subbasin boundaries. Based on further investigation of the Starke Lake/Lake Olympia Drainage Basin, the overall basin boundary may change and will be incorporated in the AutoCAD layer created during Work Order No. 2. c. The Engineer shall establish existing land-use characteristics based on aerial maps, Ocoee's adopted land use maps, FDOT land use classification, and site inspections. d. PEC will coordinate with Professional Engineering Consultants (Survey Department) to perform the following services (refer to Attachment "C" entitled "scope of surveying services" for a detailed description of each task): • Perform a bench level run within the basin to establish benchmarks and temporary benchmarks; • Survey eleven (11) cross-sections; • Survey twenty (20) culvert crossings; and 2 • Survey one (1) existing drainwell and one (1) control structure. The Engineer shall also delineate the existing storm sewer collection systems from review of existing construction plans and site inspections. e. The Engineer shall delineate existing conservation areas, potential future conservation areas, and/or jurisdictional wetlands based on review of recent aerials, construction plans, East Central Florida Regional Planning Council maps, existing soil classifications, and the adopted Land Use Maps. f. The Engineer shall review the SCS soil layer, provided by Orange County, and created during the digital mapping phase and assign attributes describing the hydrologic soil groups (e.g., A, B, B/D) within the Starke Lake/Lake Olympia Drainage Basins. g. The Engineer shall compile the above referenced information and create a Starke Lake/ Lake Olympia Drainage Basins map utilizing AutoCAD, Version 12. The file will be plotted on reproducible mylar in addition to an aerial base map. II. EXISTING CONDITIONS The Engineer shall analyze the Starke Lake/Lake Olympia Drainage Basin under existing conditions and establish the existing level of service (LOS) with respect to current flood stages, flow rates, and pollutant loadings. The Engineer shall perform the following tasks to complete this phase: a. The Engineer shall establish existing basin characteristics for each drainage subbasin which includes the following parameters: drainage subbasin area (acres), weighted runoff curve number (CN), time of concentration (Tc, minutes), and peak rate factor. b. The Engineer shall prepare a stormwater model of the existing stormwater facilities in order to perform a single event simulation (e.g., 25-year, 24-hour). A computer program entitled "Advanced Interconnected Channel and Pond Routing Model (adICPR)" will be utilized to analyze the existing system. The Engineer shall create the input files needed to model existing stormwater ponds, lakes (Starke Lake/Lake Olympia) control structures, and cross-culverts. The Engineer shall coordinate with a geotechnical engineer to evaluate recharge rates and the inflow/outflow components of Starke Lake and Laky Olympia. c. Based on the existing basin characteristics and computer model, the Engineer shall analyze the existing stormwater facilities under various rainfall events. The Engineer shall select three (3) design storm events that are consistent with the Land Development Codes and Comprehensive Plan in order to establish peak flood stages and address existing levels of service. It is anticipated that the selected storm events shall be the 10-, 25-, and 100-year, 24-hour storm events. 3 d. Based on the results of the computer modeling, the Engineer shall establish the levels of service under existing conditions. The Engineer shall develop alternatives and establish preliminary construction costs, right-of-way requirements, and address permitability. This task will consist of an interactive meeting between City staff and the Engineer to discuss one (1) practical alternative for each identified problem area. e. The Engineer shall create an AutoCAD layer(s) containing all existing drainage structures, basin boundaries, time of concentration flow paths, etc. within the Starke Lake/Lake Olympia Drainage Basins. III. PROPOSED CONDITIONS The Engineer shall analyze the Starke Lake/Lake Olympia Drainage Basin taking into account the proposed improvements and establish flood stages, flow rates, and pollutant loadings. The Engineer will evaluate the possibility of modifying the control structure between the two (2) lakes to regulate flood stages. The Engineer shall perform the following tasks: a. The Engineer shall establish proposed basin characteristics for each drainage subbasin which includes the following parameters: drainage subbasin area (acres), weighted runoff curve number (CN), time of concentration (Tc, minutes), and peak rate factor. b. The Engineer shall modify the stormwater model to account for proposed improvements with respect to stormwater facilities. The Engineer shall revise the input data files of the existing condition computer model in order to properly analyze existing, future, and proposed stormwater facilities. c. Based on the proposed basin characteristics and computer model, the Engineer shall analyze the existing and proposed stormwater facilities for three (3) selected storm events. The Engineer shall meet with City staff and discuss their findings. The Engineer shall also provide a presentation to the City Commissioners and the general public to discuss the proposed improvements. d. The Engineer shall estimate the pollutant loading rates (lbs/year) for various parameters under existing land use conditions. The Engineer shall also determine the average annual loading taking into account the proposed improvements and determine the overall reduction in pollutants. This information shall be submitted to EPA in order to address the conditions of the Part 2 permit application. IV. CAPITAL IMPROVEMENTS The Engineer shall establish a capital improvements program designed to correct identified deficiencies in levels of service. The Engineer shall perform the following tasks: 4 a. The Engineer shall coordinate with City staff concerning the selection of the desired alternatives/improvements. For each alternative selected, the Engineer shall prepare a detailed cost estimate which will include material costs and estimated land costs. b. Based on the selected alternatives, the Engineer shall determine the amount of additional right-of-way required in order to accommodate the proposed improvements. c. The Engineer shall summarize the project cost and right-of-way requirements for each alternative selected in an engineering report. The Engineer shall also outline an Operation and Maintenance Program in order to insure the long-term performance of the drainage system. This task shall conclude with a presentation to the City Commissioners summarizing the results contained in the final engineering report. d. The Engineer shall prepare a final Engineering Report which will include the following: • Existing and proposed basin characteristics. • Existing and proposed flow rates and peak flood stages for various design storm events. • Levels of water quality treatment to receiving water bodies under existing and proposed conditions. • Tabulate levels of service for each drainage subbasin and/or stormwater facilities under existing conditions. • Identify problem areas and provide design alternatives taking into account various parameters. • Provide exhibits delineating limits of flooding and location of existing, proposed, and modified stormwater facilities. V. COMPREHENSIVE PLAN The Engineer shall update the Drainage Sub-Element of the City's Comprehensive Plan and assist the City with the amendment to the Comprehensive Plan. 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N O Ca cc 0 C J 0_ Iii lL Q W E9 �? p J co o O Q � .E -0e Tc0Z O c0 030 0 * Q R N m to, S N 3 W m t Q = c R ` —,0 aDCbO• NQO OmNIORO O � r Z _ 69 Cvi tgf Y -,0 00 'tNm PO Noo cc 10) -Fti0 Q .c 3 0 I `._ a 0 0 Z 3 W a, i"---- �' RU W t 0 13 ti W a, OV ) Q. � ¢ a as 3 CC •-• Om ca 0 aca . 5as• O= � J ¢ W 0oZ4. JW 0 y 0 0 0 u) UO In lis ¢ QUQ � 14 Q OW CZ � UUcLti � 81_ V UccWa1+ 1_ U1+ 0 cuz 1_ SCOPE OF SURVEYING SERVICES STARKE LAKE/LAKE OLYMPIA DRAINAGE BASIN STUDY Ocoee Elorida ATTACHMENT "C" 1.0 General The purpose of gathering topographic data is to provide for identification of existing drainage conditions. The data will be used to develop a hydrodynamic drainage basin model which will be utilized by the City of Ocoee to identify existing drainage problems, establish the 100-year flood profile and to assess the need for drainage improvements. 1.1 Survey Services The Surveyor shall perform all survey services as outlined herein. 1.2 Survey Requirements (1) The Surveyor shall perform a closed bench loop to establish bench • marks and temporary bench marks (TMB's) throughout the limits of the survey area. (2) The level loop and subsequent bench marks shall be based on National Geodetic Vertical Datum of 1929 (N.G.V.D. 1929). Orange County bench marks are acceptable. A bench mark description form will be submitted for each bench mark set, or existing bench mark used to be incorporated in the City's Bench Mark catalog. (3) The survey activities shall be performed in accordance with Section 8: DRAINAGE DATA, Location Survey Manual, Florida Department of Transportation, Policy No. 760.001-760.012 and the Minimum Technical Standards for Land Surveyors, Chapter 21HH-6, F.A.C., pursuant to Section 472.027, Florida Statutes. 1.2.1 Channel/Ditch Surveys In establishing a channel or ditch survey, the Surveyor shall establish a referenced, recoverable base line from which topography and cross-sections, where required, will be obtained and recorded in a bound field book. Aerial MBG/0E-208/0E-208.501 0 t1/111722 am Scope of Surveying Services Starke Lake/Lake Olympia Page 2 photographs will be provided by the Engineer to assist in the ditch survey location and extent of survey (Refer to Exhibit No. 1 to 3). (1) The channel or ditch survey shall consist of cross-sections where indicated by the Engineer; (2) The cross-sections shall be taken at a maximum of twenty (20) foot intervals and at all grade break points. The section shall extend laterally far enough to accurately define the channel extent left and right of the baseline of survey; (3) In instances where the overbanks are relatively flat, the cross-section survey shall extend fifty (50) feet beyond the natural or apparent top of bank of the channel or ditch; (4) The Surveyor shall provide photographs at each cross-section surveyed in order to document the existing vegetation; (5) All cross-sections must be taken perpendicular to the flow within the channel or ditch; and (6) If standing or flowing water is present, the Surveyor shall provide the water elevation. The following cross-sections will be required to be surveyed for the drainage basin study. Cross-Section No. Location Comments Channel A-A Approximately 200-feet west of Light to Bluford (Structure No. 11) moderate Starke Lake vegetation (well Stream "A" maintained). B-B Approximately 200-feet west of Light to Cumberland Avenue (Structure moderate Starke Lake No. 10) vegetation (well Stream "A" maintained). MBG/0E-20810E-208.501 0i1/11/9t1 9:22 am Scope of Surveying Services Starke Lake/Lake Olympia Page 3 Cross-Section. . No Location Comments Channel C-C Approximately 50-feet west of Moderate CSX railroad (Structure No. 9) vegetation with Starke Lake standing water. Stream "A" D-D Approximately 150-feet west of Moderate grassed driveway (Structure No. vegetation with Starke Lake 8). standing water. Stream "A" E-E Approximately 60-feet north of Moderate CSX railroad (Structure No. 6) vegetation with Starke Lake within existing pond. standing water. Stream "A" F-F Approximately 300-feet east of Dense Bowness Road and 200-feet vegetation with Starke Lake south of CSX railroad. standing water. Stream "A" G-G Approximately 450-feet south of Dense CSX railroad crossing, vegetation with Starke Lake perpendicular to Bowness Road standing water. Stream "A" H-H Approximately 250-feet Moderate to southwest of Bowness Road dense (Structure No. 2) vegetation with Starke Lake standing water. Stream "A" I-I Approximately 1,250-feet west Dense of Bowness Road. vegetation Starke Lake (wetland) Stream "A" J-J Approximately 2,200-feet west Dense of Bowness Road. vegetation Starke Lake (wetland) Stream "A" K-K Approximately 250-feet south of Light Structure No. 1 on west side vegetation (well Starke Lake and parallel to Bowness Road. maintained) Stream "A" TOTAL NUMBER OF GROSS-SECTIONS.TO BE SURVEYED Il MBG/0E-20810E-208.501 OtV11/9t1 9:22 am Scope of Surveying Services Starke Lake/Lake Olympia Page 4 1.2.2 Culvert Surveys The Surveyor shall perform the following: (1) Determination of size, configuration (i.e., round, elliptical, arch, box, etc.), number of barrels, length, and type (i.e., CMP, RCP, etc.) of culvert. This shall include the type of end treatment (i.e., concrete straight endwall, concrete headwall with 45° wingwalls, sand cement bag headwall, etc.) and any other physical features present (i.e., guardrails, etc.); (2) Determination of upstream and downstream invert elevations of the culvert. The surveyor shall also notate whether any sediment and/or vegetation accumulation is present in the culvert during the survey. If sediment build up is present, the Surveyor shall remove the accumulation and provide the invert elevation of the culvert; (3) Field notes shall contain a complete sketch showing elevations and dimensions. This shall include plan and profile of the culvert surveyed. Also show any angle of skew, if any; (4) Location and type of utility(ies) which may be attached to the culvert or which may interfere with the flow characteristics of such; (5) Elevations of encountered water surface; (6) A profile of the roadway a minimum of two hundred (200) feet on either side of the culvert at (25-foot intervals) or as directed by the Engineer (Note: For roadways with superelevations, profile the highest edge of pavement, otherwise provide roadway profile along centerline); and (7) A visual determination of the structural condition of the culvert (utilize categories new,very good, good, fair, poor, failed). The Surveyor shall provide photographs upstream and downstream of each crossing in order to document the condition, size, configuration, etc. of the culvert to be surveyed. The following culverts will be required to be surveyed. MBG/0E-208/0E-208.501 Od/11/9t1 9:22 am Scope of Surveying Services Starke Lake/Lake Olympia Page S Structure hio.. LocationnigiTiP.a Chanel 1 Bowness Road RCP Stream "A" 2 Bowness Road RCP Stream "A" Unpaved driveway north of Double 3 wetland slough CMP Stream "A" Unnamed and unpaved road 4 south of CSX railroad RCP Stream "A" 5 CSX railroad RCP Stream "A" Immediately north of Structure 6 No. 5 (discharges to pond) RCP Stream "A" Underneath Taylor Street (culvert has multiple ditch 7 bottom inlets) RCP Stream "A" Grassed driveway west of CSX Elliptical 8 railroad RCP Stream "A" 9 CSX railroad RCP Stream "A" 10 Cumberland Avenue RCP Stream "A" 11 Bluford RCP Stream "A" 12 Lakeshore Drive RCP Stream "A" 13 Silver Star Road, west of Lakeshore Drive, east of Lakewood Avenue RCP Starke Lake Silver Star Road, east of 14 Lakeshore Drive, west of Roberts Rise RCP Starke Lake Silver Star Road, immediately 15 west of Spring Street RCP Starke Lake Silver Star Road, immediately 16 east of Spring Street RCP Starke Lake MBG/OE•208/0E-208.501 O,V11/9t1 9:22 am Scope of Surveying Services Starke Lake/Lake Olympia Page 6 Structure .. No.' Location` Type Channel Silver Star Road, immediately 17 west of Orange Avenue RCP Starke Lake Silver Star Road, immediately 18 east of Orange Avenue RCP Starke Lake Silver Star Road, east of Woodson Avenue, west of First 19 Street RCP Starke Lake 21 Silver Star Road, east of Ocoee Hill Road RCP Lake Olympia TOTAL NUMBER OF` CULVERTS TO BE SURVEYED' 20 1.2.3 Control Structure A control structure has been identified as Structure No. 20 and connects Starke Lake to Lake Olympia. This control structure consists of a pipe with a manual gate valve to control the amount of flow entering Starke Lake from Lake Olympia. The Surveyor shall perform the following: (1) Determination of size, configuration (i.e., round, elliptical, arch, box, etc.), number of barrels, length, and type (i.e., CMP, RCP, etc.) of culvert. This shall include the type of end treatment (i.e., concrete straight endwall, concrete headwall with 45° wingwalls, sand cement bag headwall, etc.) and any other physical features present (i.e., guardrails, etc.); (2) Determination of upstream and downstream invert elevations of the control structure culvert. The surveyor shall also notate whether any sediment and/or vegetation accumulation is present in the culvert during the survey. If sediment build up is present, the Surveyor shall remove the accumulation and provide the invert elevation of the culvert; (3) Identify any control features associated with the gate valve mechanism. :rBG/OE-208/0E-208.501 Ot1/11/9d 9:22 am Scope of Surveying Services Starke Lake/Lake Olympia Page 7 (4) Field notes shall contain a complete sketch showing elevations and dimensions. This shall include plan and profile of the culvert surveyed; (5) Location and type of utility(ies) which may be attached to the culvert or which may interfere with the flow characteristics of such; (6) Elevations of encountered water surface; (7) A profile of the unpaved driveway at a minimum of two hundred (200) feet on either side of the control structure at (25-foot intervals and/or at all breaks) or as directed by the Engineer; and (8) A visual determination of the structural condition of the culvert(utilize categories new,very good, good, fair, poor, failed). The Surveyor shall provide photographs upstream and downstream of each crossing in order to document the condition, size, configuration, etc. of the culvert to be surveyed. The following table summarizes the control structure required to be surveyed for the drainage study. Structure No. Location Type Channel 20 Private drive (unpaved) RCP with between Starke Lake and Lake manual gate Starke Lake/ Olympia. valve (locked) Lake Olympia TOTAL NUMBER OF CONTROL STRUCTURES TO BE SURVEYED 1 1.2.4 Drainwell Surveys A drainwell is present on Starke Lake which will be required to be surveyed to confirm Orange County data and to input the data into the drainage basin model. The following data is necessary for the hydraulic evaluation of the drainwell within the project limits: (1) Horizontal location of drainwell box; MBG/0E-208/0E-208.501 OtV11/9i1 9:22 am Scope of Surveying Services Starke Lake/Lake Olympia Page 8 (2) Location, size, material and elevation of intake pipe; (3) Elevation, material and size of drainwell casing; and (4) A complete sketch showing elevations and dimensions. This shall include plan and profile of the drainwell to be surveyed. The following table summarizes the drainwells required to be surveyed for the drainage study. Structure No. Location'. Type Channel 1-DW East side of Lakeshore Drive, Drainwell in vicinity of City of Ocoee 12-inch Dia. Starke Lake Municipal Complex TOTAL NUMBER OF DRAINWELLS TO BE SURVEYED 1 1.2.5 Miscellaneous Surveys In the event that additional survey services are required to prepare the drainage study, a maximum of five (5) crew days shall be allocated to conduct such miscellaneous surveys. This includes but not limited to additional cross- sections or survey of pertinent drainage structures. 1.3 Documentation All survey notes (to be reduced by Surveyor) and sketches shall be documented in appropriate field books, which will be submitted to the City of Ocoee upon completion of the survey tasks. MBG/0E-20810E-208.501 04/11/9t1 9:22 am PEC PROFESSIONAL ENGINEERING CONSULTANTS, INC. April 8, 1994 0E-208 1.0 Mr. Mike Galura Professional Engineering Consultants, Inc. 200 East Robinson Street Suite 1560 Orlando, FL 32801 RE: Starke Lake/Lake Olympia Drainage Basin Study Ocoee, Florida Dear Mr. Galura: Pursuant to your request, we are please to submit our proposal for professional land surveying services in connection with the above referenced project. We propose to perform these services as set forth in your letter of April 1, 1994 and accompanying exhibits. We propose to perform the above services for $5,215. Thank you for the opportunity of submitting this proposal to you. Very truly yours, PROFESSIONAL ENGINEERING CONSULTANTS, INC. IK ofropyr7,1. avid A. White, P.L.S. Vice President DAW/j sb/OTHER/OE-208/H01 engineers planners surveycrs 200 East Robinson Street • Suite 1560 • Orlando, Florida 32801 • 407,422.8062 • FAX 4071849-9401