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GEOSYNTEc CONSULTAN M <br /> Ms. Amy Terrell <br /> 6 July 2005 <br /> Page 3 <br /> _ ♦ Sulfate remained near pre-injection concentrations in both wells. <br /> ♦ During the 2"d quarter 2005 monitoring event, 1-chloropropane, a <br /> breakdown product of 1,2-DCP, was detected in MW-2 at 1.2 µg/L, but <br /> was not detected in MW-6. <br /> ♦ Ammonia concentration in MW-6 is roughly unchanged but has <br /> decreased in MW-2 to 69.3 milligrams per liter (mg/L), the lowest since <br /> the beginning of the pilot study. <br /> ♦ Indicator metabolic acids were not detected in either well during the 2"d <br /> quarter 2005 monitoring event. <br /> ♦ Favorable indicators of reducing conditions are: <br /> TON concentration in MW-6 during the 2"d quarter 2005 was <br /> 140 mg/L, which is the lowest concentration detected since <br /> monitoring in MW-6 began; <br /> TON in MW-2 has decreased by over 99% to less than the detection <br /> limit of 0.2 mg/L; <br /> pH is at or below 7 in both wells; <br /> Methane is detected in both wells; and <br /> The concentrations of dissolved iron and manganese in MW-2 have <br /> increased since the HRC injections, indicating reducing conditions. <br /> QA/QC REVIEW <br /> GeoSyntec conducted a quality assurance/quality control (QA/QC) review of the <br /> analytical data from Keystone. Data were reviewed for completeness, accuracy, <br /> precision, sample contamination, and conformance with holding times. Results of the <br /> review indicate the data are of acceptable quality. <br /> P:\PRJ2003PEM\WFS\VER\MONG\2QO5\2Q2005.do <br /> s <br />