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1 <br /> SECTION 6.0 CONCLUSIONS AND RECOMMENDATIONS <br />' petroleum hydrocarbons, microbial activity (e g , total heterotrophic plate counts and <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 , YSI 600XLM 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 KabisTM sampler in onsite wells and in <br /> CPT/Hydropunch Iocations 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, and iron) <br /> 0 A human health nsk assessment and groundwater impact analysis should be performed using <br /> the above-recommended data, in conjunction with the groundwater monitoring results <br /> presented in this report <br /> d An evaluation of potential remedial alternatives and respective rough order of magnitude <br /> costs should be conducted <br /> • <br /> S hPligJl410407000dlSYYAR04MAINTYARD5ADOG 6-3) <br /> URS Greiner Woodward Clyde <br />