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FIRST QUARTER 2006 GROUNDWATER TREATMENT FACILITY MONITORING REPORT <br />FORWARD LANDFILL WDR ORDER NO. R5-2003-0080 <br />methanol, and the sample preservative is hydrogen chloride. Chloromethane is occasionally <br />produced in a sample when methanol reacts with hydrogen chloride. The chloromethane <br />detected in the January effluent sample may have resulted from this reaction. <br />TABLE 2 <br />Effluent Monitoring Results <br />Forward Landfill Groundwater Treatment Facility Monitoring Report, First Quarter 2006 <br />Analysis Date Parameters Units Results <br />Field Parametersa <br />1/12/06 pH pH units 8.0 <br />Conductivity µmhos/cm 1,000 <br />2/1/06 pH pH units 7.7 <br />Conductivity µmhos/cm 1,020 <br />3/2/06 pH pH units 7.9 <br />Conductivity µmhos/cm 1,010 <br />Laboratory Analysesb <br />1/12/06` Chloromethane µg/L 0.35 J° <br />All other VOCs µg/L ND <br />Total Dissolved Solids milligrams per liter 677 <br />2/1/06` All VOCs µg/L ND <br />3/2/06` Acetone µg/L 1.5 Je <br />All Other VOCs µg/L ND <br />aAnalyzed using a calibrated Horiba U-10 water quality meter. <br />bVOCs were analyzed using U.S. Environmental Protection Agency (USEPA) Method SW8260B. Total <br />dissolved solids were analyzed using USEPA Method 160.1. <br />`Only EW -1 was operational when this sample was collected. <br />°The method detection limit (MDL) and practical quantitation limit (PQL) for chloromethane are 0.31 and <br />0.5 µg/L, respectively. <br />eThe MDL and PQL for acetone are 0.95 and 10 pg/L, respectively. <br />Notes: <br />µmhos/cm = micromhos per centimeter <br />J = estimated value, below quantitation limit <br />ND = nondetect <br />µg/L = micrograms per liter <br />Acetone was detected in the effluent sample collected on March 2, 2005, and also in the <br />associated trip blank sample. The effluent and trip blank concentrations are 1.5 J µg/ L and <br />8.2 J µg/ L, respectively. Acetone is a common laboratory contaminant that can be detected <br />at random concentrations in field samples, trip blanks, and quality control samples resulting <br />from fluctuations in daily laboratory practices. The associated laboratory control sample had <br />a high -bias acetone spike recovery at 235 percent. Acetone was detected in the trip blank at a <br />concentration significantly greater than in the effluent sample. The trip blank was prepared <br />prior to sample collection and shipped with the empty sample vials. The laboratory water <br />used for the trip blank might have contained acetone. The acetone detected in the laboratory <br />quality control samples is evidence that the acetone contamination is associated with <br />laboratory activities, and that acetone is not actually present in the effluent. In addition, <br />RDD/061100003 (NLH3129.DOC) 5 <br />