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' • Biochemical Oxygen Demand (BOD)by SM5210B; <br /> • Chemical Oxygen Demand(COD)by SM522013; <br /> ' • Ortho-Phosphate by SM 4500-PE or EPA 300.1; <br /> • Total Manganese by E200.7; <br /> • Dissolved Iron by EPA 200.7; and <br /> • Ferric and ferrous Iron by SM 3500-FeD B4c. <br /> These samples were collected and analyzed during the third quarter groundwater-monitoring <br /> event. <br /> 3.4 Evaluation of Saturated Soil <br /> ' US Environmental Protection Agency (USEPA) guidance documents recommend the <br /> assessment of the properties of the contaminants to be treated such as; concentration, vapor <br /> pressure, Henrys Law Constant, and boiling range. Gasoline contamination at concentrations <br /> ' observed throughout the commingled plume, fit within the screening criteria of the guidance <br /> document indicating the technology is very effective. The decision tree in the guidance <br /> document also relies on the evaluation of physical and geochemical conditions of the aquifer. <br /> ' 3.4.1 Hydrocarbon Degrading Bacteria <br /> ' Bacteria that degrade petroleum hydrocarbons have two characteristics. They are aerobic or <br /> facultative, meaning that the terminal electron acceptors for the bacteria are either oxygen or a <br /> combination of oxygen and other compounds such as nitrate or sulfate. Secondly, these <br /> 1 bacteria are heterotrophic, meaning they rely on an organic source of carbon. Samples of the <br /> permeable silty sand and sand layers, CT-MW-9-87 (73.5-75'), CT-MW-9-120 (80-81.5'), <br /> and CT-MW-9-120 (115-116.5') were submitted for total heterotrophic plate counts and for <br /> plate counts of hydrocarbon degrading bacteria. <br /> The criteria in the decision tree of the guidance document for effective biosparging are a <br /> heterotrophic count of 104-107 colony-forming units per gram (cfu/g) of soil. The reported <br /> values were greater than 106 cfu/g for all three samples. The reported values of hydrocarbon <br /> degrading bacteria were all greater than 104 cfu/g for all three samples. These results indicate <br /> ' that biosparging in the `B" and "C" permeable zones would be effective. The data is <br /> summarized in Table 6. <br /> ' 3.4.2 Aquifer Characteristics and Nutrient Levels <br /> Some of the characteristics for the aquifer, such as permeability, are difficult to test. PSC was <br /> ' not able to collect sufficient sample of the permeable material to test permeability in the <br /> laboratory. As previously discussed, the evaluation of permeability relied on values obtained <br /> in literature. Based on the results of the samples collected from the permeable zones, the <br /> Monitoring Well Installation <br /> and <br /> BioSparge Evaluation Report <br /> ' Prepared For:Sure Lee Bakery Omup,Inc. 16 Prepared By:PSC Industrial Outsourcing,LP <br /> Sere Lee—Lincoln Street 2009-12-03-MW Installation&BioSparge Evaluation Report(Final).doc Report Date:December 3,2009 <br />