Laserfiche WebLink
LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ' Ground Zero Analysis,Inc. <br /> Workorder# 0311468 <br /> ' Six 1 Liter Tedlar Bag samples were received on November 25, 2003 The laboratory performed <br /> analysts via modified EPA Method TO-3 for Methyl tert-Butyl Ether (MTBE), Benzene, Toluene, <br /> ' Ethylbenzene, Xylenes and Total Petroleum Hydrocarbons (TPH) MTBEBTEX was analyzed via <br /> GC/PID and TPH via GC/FID The TPH results are calculated using the response of Gasoline A <br /> molecular weight of 100 is used to convert the TPH ppmv result to ug/L The method involves <br /> ' concentrating up to 200 mL of sample The concentrated aliquot is then dry purged to remove water <br /> vapor prior to entering the chromatographic system See the data sheets for the reporting limits for <br /> each compound <br /> ' Requirement TO-3 ATL Modifications <br /> Daily Calibration Standard Prior to sample analysis Prior to sample analysis and after the analytical batch d= <br /> Frequency and every 4- 6 hrs 20 samples <br /> ' Initial Calibration Calculation 4-point calibration 5-point calibration using average Response Factor <br /> using a linear <br /> regression model <br /> ' Initial Calibration Frequency Weekly When daily calibration standard recovery is outside 75 - <br /> 125%, or upon significant changes to procedure or <br /> instrumentation <br /> ' Moisture Control Nafion system Sorbent system <br /> Minimum Detection Limit Calculated using the 40 CFR Pt 136 App B <br /> ' (MDL) equation DL=A+3 3S, <br /> where A is intercept of <br /> calibration line and S is <br /> the standard deviation <br /> ' of at least 3 reps of low <br /> level standard <br /> Preparation of Standards Levels achieved Levels achieved through loading various volumes of the gas <br /> through dilution of gas mixture <br /> mixture <br /> ' Receiving Notes <br /> There were no receiving discrepancies <br /> Analytical Notes <br /> There were no analytical discrepancies <br /> ' Definition of Data1 f n FI <br /> ua i i Flags <br /> Seven qualifiers may have been used on the data analysis sheets and indicate as follows <br /> B - Compound present in laboratory blank greater than reporting limit <br /> J - Estimated value <br /> E - Exceeds instrument calibration range <br /> S - Saturated peak <br /> Q - Exceeds quality control limits <br /> ' U- Compound analyzed for but not detected above the detection limit <br /> M - Reported value may be biased due to apparent matrix interferences <br /> I <br /> ' Page 2 of 12 <br />