Master Plan Development - City of Boca Raton

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City of Boca Raton Stormwater Management Master PlanPart I – Task 3 Reportwater marks were observed in some locations, indicating that ponding had occurred to that observed levelduring a prior rainfall event.For the areas where swale degradation on individual lots appeared to be the primary cause of the pondingcomplaints, it was discussed and agreed with the City that no conceptual project development wasnecessary. Several of the initially identified areas were eliminated for this reason or because the problemhad already been addressed by the City or a resident.The next occurrence of field observations occurred during a rainfall event in February 2008, when theCity received approximately 3”- 4” of rain. Again, the identified problem areas were visited anddocumented with notes and photographs. In all cases the rainfall confirmed the reported problem(s).While driving from one location to another, two additional problem areas were identified, documented,and after discussion with the City, were added to the list of potential project areas.D. Conceptual Projects Development/Cost Estimates/Water Quality ImpactsA team of three engineers conducted the field observations, reviewed the documentation, and discussedpossible solutions to the observed problems. This approach allowed informed discussion of viablecorrective measures that were ultimately developed into a conceptual project for each area. It was noted,due to missing information (location of other utilities, specific topographic data, pipe conditions (in somecases), soil conditions, drainage areas, etc.), that projects being proposed should be considered onlyconceptual at this time.It is anticipated that the preliminary engineering for most of these projects will include geotechnicaltesting of the soils, surveying (including other existing utility information) and proposed system analyses.This information is necessary to determine if the conceptual project is viable given specific siteconditions. It is not unusual for this additional information to result in the modification of some of theproposed conceptual improvements, in order to accommodate site conditions. In many cases, additionalinformation will allow for an improved design that may not have been considered before the confirmationof the facts. It is important that the City recognize this possibility and be open to future solutions thatmay be offered for the problem areas. It is anticipated that during the preliminary engineering phase,calculations will be performed on the level of service provided by the existing system and the level thatwill be achieved by the proposed system. These analyses will indicate whether the proposedimprovements will achieve the level of service targeted by the City for that particular use (parking lot,local street, collector road, etc.) or whether additional improvements are needed.Based upon the conceptual nature of the proposed improvements, conceptual-level opinions ofconstruction cost were prepared. Unit prices were based on information available for recently bid andconstructed stormwater projects and/or information gathered from contractors and their suppliers. Thisconceptual level of accuracy represents an “order of magnitude” estimate which will allow the City tobudget for completion of the design and construction.During the development of the conceptual projects, an effort was made to incorporate water qualityimprovements to each project. In general, dry retention/detention areas and exfiltration trench were theL:\boca\bocaswmp\A6016.03\rp02accm.docPage 2MOCK•ROOS
City of Boca Raton Stormwater Management Master PlanPart I – Task 3 Reportwater quality systems initially considered. In the majority of areas, no positive outfall currently exists;the runoff is intended to infiltrate the ground. This type of stormwater management system inherentlyincludes a water quality improvement mechanism by allowing runoff to be filtered by the soil beforereaching the ground water surface, or by allowing nutrients to be taken up by the vegetation. In manycases, the conceptual projects do not provide additional water quality, but they do maintain or enhance thestormwater runoff’s ability to infiltrate the ground, rather than pond in streets and drives.The conceptual project locations are shown and listed on the following figure. A description, photographs,an exhibit of the conceptual project, and the conceptual cost estimate for each conceptual projectfollow. The existing City-owned utilities shown on the exhibits were provided by the City during theTask 1 phase.The Boca Heights neighborhood has had historic flooding problems. The City Utility Department hasbeen negotiating with its water/sewer consulting engineer for a water and sewer rehabilitation project inthe Boca Heights neighborhood that will also include stormwater improvements. Although this project isentering the design phase, the City requested that it be included in the Stormwater Management MasterPlan. The location of the project area is shown on the following map.L:\boca\bocaswmp\A6016.03\rp02accm.docPage 3MOCK•ROOS
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Appendix ATask 1 - Existing Conditi
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Engineer’s Signature PageI hereby
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APPENDIX ASCOPE OF SERVICES
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Impervious AreaWater Quality Volume
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Task 1 Deliverables - The CONSULTAN
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Task 2 Deliverable - The CONSULTANT
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Table 1SFWMD Permit Data(Selected E
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ComplaintIDSite Address Subdivis Da
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Table 3Major Outfall InformationMaj
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Table 4Potential High Risk Facility
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City of Boca RatonStormwater Manage
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City of Boca Raton Regulatory Infor
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Master Plan Development - City of Boca Raton

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