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File No. 8013-01 <br /> May 30, 1999 - -- <br /> Page 3 <br /> 4.0 ANALYTICAL LABORATORY RESULTS <br /> following <br /> The results of the groundwater analyses are summarized in Table II. In general, h the fo o g <br /> explanations apply to the groundwater results: <br /> 4.1 TPHg and BTEX <br /> Total petroleum hydrocarbons as gasoline (TPHg) and the associated volatile fuel <br /> ^ components BTEX were detected in well MW-2 at concentrations similar to prior recent <br /> sampling episodes. No petroleum hydrocarbons were detected in the other three wells. <br /> 4.2 Petroleum Ongenates <br /> No petroleum oxygenates were detected in any of the four wells. <br /> 4.3 COD — } <br /> Chemical oxygen demand (COD) represents the total oxygen demand of the contaminated <br /> s groundwater. It is the to at which oxygen is used, both organically and inorganically. <br /> The COD as non-dete t for well MW-2, suggesting limited oxygen demand and <br /> subsequently microbial activity. <br /> 4.4 BOD <br /> Biochemical oxygen demand (BOD) represents the biological oxygen demand of the <br /> contaminated groundwater. It is the rate at which oxygen is used by microorganisms. An <br /> (` increase in BOD (and subsequently COD) would infer an increase in microorganism <br /> activity, an us aft ' crease in the rate of biodegradation. The BOD for well MW-2 was <br /> als <br /> 4.5 Nitrogen <br /> Nitrogen is a nutrient required for optimum biodegradation.- Nitrogen (analyzed as nitrate) <br /> Lwas detected at a concentration of 2gLL This low concentration may imply a need to <br /> supplement this nutrient. <br /> 4.6 Phosphate <br /> In addition to nitrogen, phosphorus is a nutrient also required for optimum biodegradation. <br /> i The lack of detection of phosphorus (analyzed. as phosphate) may imply a need to <br /> supplement this nutrient.. <br /> 4.7 Heterotrophic Plate Count <br /> Biodegradation is accomplished through the consumption of organics (the contamination, <br /> in this case) by indigenous microorganisms. Consequently, to optimize biodegradation, <br /> an adequate microbial population must exist. This can be evaluated by performing a <br /> heterotrophic plate.count. <br /> `I <br /> JJW GEOSCIENCES Inc. <br />