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SECTION 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> hydrocarbon-oxidizing heterotrophic plate counts) and nutrients (e g , total organic carbon, <br /> total Kjeldahl nitrogen, nitrate/nitnte, ammonia, sulfate, ferrous/ferric iron, and total <br /> phosphate/orthophosphate) to assess potential aerobic and anaerobic degradation of <br /> petroleum hydrocarbons Current petroleum-hydrocarbon concentrations in soil may be <br /> compared to previously detected concentrations Groundwater quality parameters may be <br /> obtained from onsite wells by using a down hole multi-parameter probe with data logger <br /> (e g , YS1600XLM probe and 610 DM data logger) A multi-parameter probe may be used to <br /> monitor for pH, temperature, specific conductivity, dissolved oxygen, and reduction- <br /> oxidation potential with depth using the Kabis'rm sampler in onsite wells and in <br /> CPT/Hydropunch locations Groundwater samples may be collected with depths consistent <br /> with soil samples These groundwater samples may be analyzed for petroleum hydrocarbons, <br /> microbial activity, nutrients, and potential electron acceptors (nitrate, sulfate, iron) <br /> o The human health risk assessment and groundwater impact analysis should be completed <br /> using the above-recommended data, in conjunction with the groundwater monitoring results <br />' presented in this report <br /> o An evaluation of potential remedial alternatives and respective rough order of magnitude <br /> costs should be conducted <br /> S 1PRO.Ulo4O1OOO41S140PIOISHOP1OSA.DOC 6-3 URS Greiner Woodward Clyde <br />