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LABORATORY NARRATIVE Modified RSK 175 Prima Environmental Workorder# 0410487 ' Nine VOA Vial-40 nL samples were received on October 22, 2004 The laboratory performed analysts via Modified RSK 175 for Methane using GC/FID Tile method involves placing an aliquot of the sample in a ' headspace vial. The vial is then placed into HP7694 Headspace Autosampler equipped with oven, shaker and 1 rrL sample loop Sample is incubated and then equilibrated at 400C for 15 minutes with high agitation. Filially, a direct injection of the headspace is performed See the data sheets for the reporting limits for each ' compound Requirement RSK 175 AFL Modifications Sample Collection Collect sample in 60 mL Collect sample in 40 mL VOA vial cramp-top vial Headspace Generation Headspace is generated 5 0 mL of sample is displaced with 5 0 mL Nitrogen and in 60 mL sample vial by transferred to a Nitrogen purged and capped autosampler displacing volume of vial Headspace is then generated in the autosampler vial liquid with Helium The amount of liquid should be 10%of sample volume in bottle,up to 10 ml- Sample LSample Preparation Sample is shaken 5 min Prior to injection,autosampler shakes sample for 15 min to equilibrate analyte while heating to 40'C between headspace and liquid phase ' Headspace Injection Syringe injection of 300 Autosampler pressurizes sample to fill 1 0 mL loop with mL headspace into GC headspace sample Calibration and Quantitation Direct injections of gas Calibration standards are prepared by addition of a phase standards are gaseous spike solution to clean water Response factors used to obtain a are calculated for each level of a multi point calibration, Calibration Curve and the mean is used to calculate quantitation for each ' Henry's Law is used to target analyte calculate mg of gas per Liter of water Calculation requires recording total volume of serum bottle and headspace,and sample temperature Initial Calibration Curve(ICAL) Linear regression %RSD</=30%,use average RF to quantify results Lab Blanks Blank subtraction is No blank subtraction, Lab Blank must be less than the performed Reporting Limit Specified Detectors FID or ECD FID or TCD iReceiving Notes A Temperature Blank was not included with the shipment Temperature was measured on a representative sample and was not within 4t2 °C Coolant in the form of ice/blue ice was not present The discrepancy Page 2 of 15