Master Plan Development - City of Boca Raton

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City of Boca Raton Stormwater Management Master PlanDrainage BasinC-15 WatershedA portion of the City is within the SFWMD C-15 Basin. The drainage areas discharging into theL-40, L-41, and L-42 Canals west of Military Trail, or that discharge directly into the C-15 Canalupstream of the S-40 structure are within the C-15 Basin.Hillsboro WatershedThe Hillsboro Watershed within the City is that area that ultimately drains to the freshwaterportion of the Hillsboro Canal (upstream of the G-56 Structure). This area is in the west centralarea of the City and discharges to the Hillsboro Canal via the LWDD E-2 Canal outside the Citylimits (not shown).Figure 5 provides the graphic representation of the delineated watersheds. Please note that thewatersheds extend beyond the City limits, but were only reviewed and revised within the Citylimits.Once the five major watersheds were delineated, a comparison was made to previous/otherdelineations (SFWMD, NPDES, and DEP). Figure 6 shows the five major basins, overlaid withthe previous basin delineations. The two areas where the SFWMD drainage basin delineationdiffers most notably are: between Military Trail and Dixie Highway, north of Yamato Road; and,west of Dixie Highway, south of Glades Road. The area most notably difference from theNPDES basin delineation is the area west of Dixie Highway, south of Glades Road. Finally, themost notable difference from the DEP delineation is the north-south boundary between theICWW and E-4 basins and the C-15 and E-3 basins.The DEP uses their basin delineations in the water quality modeling that is conducted as part ofthe TMDL program. Therefore, we recommend that the City provide the updated watersheddelineations for DEP’s consideration in the very near future.B. Major OutfallsA requirement of the City’s MS4 NPDES permit is the identification of major outfalls to Watersof the State and their associated drainage areas. A major outfall is defined as a discharge pipe of36" or larger, or a discharge pipe that serves a drainage area 50 acres or larger in size. The City’smajor outfalls were determined by first identifying the pipes within the City’s stormwaternetwork that are 36" or larger. Following this, drainage areas that discharge to Waters of theState were delineated. There were no drainage areas of 50 acres or larger discharging from a pipeless than 36” in size. There are 23 major outfalls within the City; shown on Figure 7. Eight ofthe 23 outfalls discharge stormwater from only PBC roadways; however, they have been includedbecause the City’s stormwater network information identifies the City as the owner of the outfallstructures. The identification number shown for each outfall basin in Figure 7 corresponds tothe entries in Table 3. This table provides a summary of the outfall basin information.L/bocaswmp/a6016.01/InterimReport 11-27-07/r02Page 10MOCK•ROOS
City of Boca Raton Stormwater Management Master PlanOther Relevant Data4. Other Relevant DataA. High Risk FacilitiesThe City’s MS4 NPDES permit requires that it “identify and control pollutants in stormwaterdischarges to the MS4 from any municipal landfill(s); hazardous waste treatment, storage,disposal and recovery facilities; facilities that are subject to EPCRA [Emergency Planning andCommunity Right-to-know Act] Title III, Section 313; and any other industrial or commercialdischarge which the permittee(s) determine is contributing, or has the potential to contribute, asubstantial pollutant loading to the MS4.” 3 The permit further requires that in addition toidentifying facilities, the City determine priority, develop a schedule for and carry outinspections.To develop the initial list of potential high risk facilities, both the EPA Envirofacts Database(http://www.epa.gov/enviro/) and the DEP Solid Waste Database(http://ca.dep.state.fl.us/imf/caFrameset.jsp?browser=IE5up) were searched to identify facilitieslocated within the City limits. The Envirofacts website allows searching of multiple informationsystems, including the Resource Conservation and Recovery Information System (RCRIS), theComprehensive Environmental Response, Compensation, and Liability Information System(“CERCLIS”) – also known as Superfund, and the Toxic Release Inventory System (“TRIS”).It has been the methodology of many PBC municipalities to prioritize the list of high riskfacilities by the information system in which they are found. The CERCLIS and TRIS listedfacilities are considered to be a higher risk, as unauthorized discharge(s) has already occurredfrom those facilities.The latitude and longitude of the facilities (rather than street address) were used to map thelocations. Figure 8 shows the locations of the identified facilities. Those facilities located withinthe City limits were then selected, and the associated database information was exported to an MSExcel spreadsheet as the High Risk Facility Inventory (See Table 4).From the information gathered, it appears that five (5) facilities located in the City are highpriority. The City should conduct additional research and inspections to determine if thesefacilities/sites are in fact high risk for the discharge of pollutants into its MS4.This information should be updated on an annual basis as fulfillment of the requirements of theMS4 NPDES permit. In addition, the inventory and map information may be helpful in locatingthe potential source of contamination in the event that an illegal discharge is detected in the City’sMS4.3 FLS0000018 MS4 NPDES PermitL/bocaswmp/a6016.01/InterimReport 11-27-07/r02Page 11MOCK•ROOS
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Master Plan Development - City of Boca Raton

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