Field Test of BMPs Using Granulated Ferric Oxide Media to Remove Dissolved Metals in Roadway Stormwater Runoff (2019) / Chapter Skim
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5 Chapter 2 Field Testing of Ferric Oxide Media Filters: Project Design 2.1 Field Testing Sites and Tributary Watersheds Two existing ferric oxide filters were chosen for this study. Both sites have similar design characteristics: (1)
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6 Figure 2-2 Highway 36/61 vault-type ferric oxide filter during and after construction. From aerial and ground-based photographs of the Woodlynn Avenue and the Highway 36/61 cells, differences are apparent in the tributary watersheds and this influenced designed decisions, affects runoff chemistry, and site hydrology and hydraulics.
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7 Figure 2-3 Modified design drawing for the Woodlynn Avenue ferric oxide-sand filter. 2.1.1.2 Vault-Type Filter at Highway 36/61 The ferric oxide filter at Highway 36/61 consists of two inlets with the HWY Inlet West inlet fed by direct highway runoff and runoff to the HWY Inlet Pond originating from highways and commercial properties as well as some open space consisting of swales and small intermittent wetlands (see Figure 2-4)
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8 Figure 2-4 Modified design drawing of the Highway 36/61 ferric oxide filter. 2.1.1.3 Differences of the Ferric Oxide Filter Systems Studied There are several significant differences between the designs of these two systems; the differences and how they are expressed in the monitoring data are discussed in Chapter 3.
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9 material compared the Highway 36/61 material. Also provided for comparison is the elemental analysis of the iron aggregate used as the parent material for the ferric oxide filter (Table 2-2)
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10 2.2 Monitoring Design 2.2.1 Objectives and Sampling Design The overall objective of this study is to monitor two full scale ferric oxide-sand filters to quantify the capacity of a ferric oxide media used in a filter bed to remove dissolved metals from natural stormwater runoff and under natural hydrologic conditions. The monitoring design was scoped to enable the practitioner to estimate potential metals removal as a percentage and load reduction for filtration practices that use ferric oxide in a similar manner to the systems evaluated in this current study.
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11 the analytical laboratories will be maintained in Barr's Laboratory Management Information System to minimize data management error. 2.2.1.1 Monitoring Locations Woodlynn Avenue Figure 2-3 shows the sampling layout of the Woodlynn Avenue site.
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12 Table 2-3 Parameters monitored, method and reporting units. Test Method Analyte Reporting Limit Units Metals EPA 1638 Mod As 0.080 µg/L EPA 1638 Mod Cr 0.15 µg/L EPA 1638 Mod Cu 0.30 µg/L EPA 1638 Mod Fe 6.0 µg/L EPA 1638 Mod Pb 0.030 µg/L EPA 1638 Mod Ni 0.24 µg/L EPA 1638 Mod Zn 3.0 µg/L General Parameters SM2540 D‐97 TSS 0.6 mg/L SM2540 E‐97 VSS 0.6 mg/L SM5310C‐00 DOC 0.5 mg/L SM2320 B‐97 Alkalinity, Total (as CaCO3)
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13 Dissolved oxygen probe (HOBO DO Data Logger U26-001) Tipping bucket rain gauge (Texas Electronics 525-L Rain Gage with 6-in.
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14 Accuracy For the analytical results, accuracy is evaluated as the degree of agreement between an observed value and an accepted reference value and measures bias in a measurement system. Accuracy will be addressed by calibrating field and laboratory instruments, and by analyzing laboratory quality control samples.
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