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June 29, 2017 | Page 3 File No. 0504-119-00 <br />Groundwater samples were submitted to TestAmerica for chemical analysis using the methods described <br />in “Section 3.0” and chemical analytical results are discussed in “Section 5.0.” <br />Purge water generated during groundwater sampling was drummed with the water generated during <br />previous well development/purging. <br />TABLE 1. DEPTH TO GROUNDWATER AND GROUNDWATER QUALITY PARAMETERS <br />Monitoring <br />Well <br />Depth to Water and Field Measured Natural Attenuation Parameters <br />Depth <br />to <br />Water <br />(feet) <br />Groundwater <br />Elevation <br />(feet) <br />pH <br />(pH <br />units) <br />Specific <br />Conductivity <br />(mS/cm) <br />ORP <br />(mV) <br />Dissolved <br />Oxygen <br />(mg/L) <br />Turbidity1 <br />(NTU) <br />Temperature <br />(degrees C) <br />MW-1 3.96 1573.68 7.09 5.78 94.8 5.31 6.4 11.9 <br />MW-2 3.76 1573.32 6.76 7.87 -44.4 0.11 4.5 11.3 <br />MW-3 3.88 1573.14 6.82 7.97 88.4 1.00 4.3 11.5 <br />MW-4 4.41 1572.31 7.03 0.824 13.3 0.22 14.4 14.3 <br />MW-5 4.67 1569.56 7.08 1.167 87.1 0.77 6.4 11.3 <br />MW-6 4.95 1571.52 7.32 0.587 90.3 3.77 3.4 10.9 <br />Notes: <br />1Turbidity is not a natural attenuation parameter but was measured in the field to evaluate groundwater stabilization. <br />2 Groundwater elevations calculated using the formula: Groundwater Elevation = Top of Casing Elevation - Depth to Water <br />mS/cm = milliSiemens per centimeter; mV = millivolts; mg/L = milligrams per liter; NTU = nephelometric turbidity units <br />5.0 CHEMICAL ANALYTICAL RESULTS <br />5.1. Groundwater Chemical Analytical Results <br />Six groundwater samples, and one duplicate, were submitted from monitoring wells MW-1 through MW-6 <br />to TestAmerica for the chemical analyses described in “Section 3.0 Scope of Services.” The duplicate <br />sample was collected from monitoring well MW-3. TestAmerica’s laboratory report is included in Appendix B; <br />chemical analytical results are summarized and compared to MTCA Method A cleanup levels for <br />unrestricted land use in Table 2, and summarized below. <br />GRPH was detected in the groundwater sample collected from monitoring well MW-2 at a concentration <br />less than the MTCA Method A cleanup level. Other analytes were not detected at concentrations greater <br />than the laboratory reporting limits.