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Geological Technics Inc. Page 4 Groundwater Monitoring Report Project No. 1030.2 September 30, 2002 ' Natural Attenuation Parameter (NAP) Results Eight natural attenuation parameters were tested for as listed below. ' 1. Total Alkalinity (T Alk) 2. Iron (Fe) 3. Nitrate (NO) ' 4. Sulfate (SO4) 5. pH 6. Temperature 7. Conductivity 8. Oxidation-Reduction Potential (ORP) ' The results are summarized in Table 3 of Appendix A, and the laboratory analytical data reports are included in Appendix C, ' Data presented in Table 3 shows the following classifications of the wells for the current monitoring data. • Wells considered near the center of the contaminated plume include MW-1. • Wells considered to be near the margins of the plume include MW-101 & 4. • Wells considered to represent background conditions include MW-2, 3 & domestic well. The hydrocarbon analytical data correlates well with these classifications, with MW-1 being the only impacted well. The following table gives general characteristics of background conditions compared to conditions inside the plume. Parameter Source of the Background Plume Plume Parameter Behavior Behavior Core Margins ' Nitrate' e-Acceptor Slightly Enriched Depleted Not Depleted Ferrous Iron' Metabolic Byproduct Slightly Enriched Slightly Enriched Not Enriched Sulfate' e Acceptor Site Specific Slightly Enriched Mildly Depleted ' Temperature Metabolic Byproduct Site Specific Elevated Slight Elevated pH Metabolic Byproduct Site Specific Slightly Lower Slightly Higher Alkalinity Metabolic Byproduct Site Specific Enriched Mildly Depleted Redox Potential Metabolic Byproduct Negative Value Depleted Slightly Lower ' Conductivity Metabolic Byproduct Site Specific Elevated Unaffected e=electron ' Terminal electron accepting process: 1 =denitrification 2=reduction 1