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' SAir <br /> TOX%CS LTD, <br /> ' AN ENVIRONMENTAL ANALYTICAL LABORATORY <br /> LABORATORY NARRATIVE <br /> ' Modified ASTM D-1945 <br /> PSC Industrial Outsourcing LP <br /> Workordert#0902029CRI <br /> ' Eight 1 Liter Summa Canister samples were received on February 02, 2009. The laboratory performed <br /> analysis via modified ASTM Method D-1945 for Methane and fixed gases in natural gas using GC/FID or <br /> ' GC/TCD. The method involves direct injection of 1.0 mL of sample. <br /> On the analytical column employed for this analysis,Oxygen coelutes with Argon. The corresponding peak is <br /> quantitated as Oxygen. <br /> Method modifications taken to mn these samples are summarized in the table below. Specific project <br /> ' requirements may over-ride the ATL modifications. <br /> Requirement ASTMD-1945 ATL Modifications <br /> ' Normalization Sum of original values Sum of original values may range between 85-115%. <br /> should not differ from Normalization of data not performed. <br /> 100.0%by more than <br /> 1.0%. <br /> Sample analysis Equilibrate samples to No heating of samples is performed. <br /> 20-50°F.above source <br /> temperature at field <br /> ' sampling <br /> Sample calculation Response factor is Peak areas are used for all target analytes to quantitate <br /> calculated using peak concentrations. <br /> ' height for C5 and <br /> lighter compounds. <br /> Reference Standard Concentration should A minimum 3-point linear calibration is performed. The <br /> ' not be<half of nor acceptance criterion is%RSD</= 15%. All target analytes <br /> differ by more than 2 X must be within the linear range of calibration(with the <br /> the concentration of exception of 02,N2,and C6+Hydrocarbons). <br /> the sample. Run 2 <br /> consecutive checks; <br /> must agree within 1%. <br /> ' Sample Injection Volume 0.50 mL to achieve 1.0 mL. <br /> Methane linearity. <br /> ' Receiving Notes <br /> Sample SG4 was received with significant vacuum remaining in the canister. The residual canister vacuum <br /> resulted in elevated reporting limits. <br /> Analytical Notes <br /> There were no analytical discrepancies. <br /> ' THE WORK ORDER WAS REISSUED ON FEBRUARY 19, 2008 TO CORRECT THE <br /> IDENTIFICATION OF SAMPLE SG-1DUP PER CLIENT REQUEST. <br /> ' Page 2 of 16 <br />