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<br /> <br />Table 1. <br />Hydrodynamic Vortex Separator Performance Specifications <br />Diamete <br />r <br />Max <br />Depth1 MTFR-502 MTFR-1002 <br />Scour <br />Flow <br />Rate3 <br />PTFR4 Headloss5 <br />Oil <br />Storage <br />Capacity6 <br />Sediment <br />Storage <br />Capacity6 <br />(feet) (feet) (cfs) (cfs) (cfs) (cfs) (feet) (gal.) (gal.) <br />4 4.1 1.2 1.6 2.4 3 0.68 70 141 <br />6 5.9 3.4 4.3 6.5 8 0.95 216 424 <br />8 7.7 6.9 8.8 13.3 15 1.1 540 939 <br />10 9.4 12 15 23.3 25 1.2 1,050 1,757 <br />12 11.2 19 24 38 38 1.4 1,770 2,970 <br /> <br />Notes: <br />1. Depth measurement is from the outlet invert to top of the bottom slab. <br />2. MTFR-50 and MTFR-100 are the Maximum Treatment Flow Rates for removing target particle sizes of 50 microns and <br />100 microns, respectively. <br />3. Scour Flow Rates are based on testing that demonstrates retention of captured sediment having a D50 of 100. Effluent <br />concentrations shall not exceed 20 mg/L. <br />4. PTFR or Peak Treatment Flow Rate is based on the HVS maintaining positive removal efficiencies and headlosses no <br />greater than those listed above for each model. <br />5. Headlosses are the difference in water elevations upstream and downstream of the HVS as determined by ASTM C1745 <br />/ C1745M – 11. The headlosses listed above for any particular model are for that HVS operating at the Peak Treatment <br />Flow Rate. <br />6. Refer to 2.01 E and F. <br /> <br />PART 3 – EQUIPMENT <br /> <br />A. The HVS shall be manufactured with materials typically used in stormwater drainage <br />systems that have a minimum life expectancy of 30 years. <br /> <br />(i) Materials of construction shall be cross-linked polyethylene (XLPE) and/or Type <br />304 stainless steel or carbon steel powder coated in accordance with ASTM 775/ <br />ASTM A775M with a resulting thickness of 8-12 mils. All components shall be <br />designed to withstand all normal loadings associated with fabrication, shipping, site <br />installation, and normal operation of the equipment. <br /> <br />(ii) Precast shall be manufactured with concrete that has attained a compressive <br />strength of 4,000 psi after 28 days. The structure shall be reinforced to withstand <br />an HS20-44 loading. Shiplap joints shall be sealed with butyl rubber mastic <br />sealant conforming to ASTM C990. Slab tops shall be suitably reinforced and <br />provided with manhole openings and covers as required. The cast iron manhole <br />frames and covers shall be sized as per the manufacturer’s drawings and shall be <br />in accordance with ASTM A48, CL.35B and AASHTO M105. The masonry fixing <br />bolts shall be Type 304 stainless steel. <br /> <br />City of Sunny Isles Beach <br />NE 174th Street Roadway Improvements <br />02630 - 9 Storm Drainage <br />14-1758 / 09-19-2014 <br />