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' 13 Ap nl 2001 <br />' AGE-NC Project No 96-0232 <br /> Page 3 of 14 <br />' laboratory for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d <br /> and motor oil, respectively)by EPA Methods 355015030/8015 Modified, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, <br /> • Fuel oxygenated compounds-methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether <br /> (RIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and MTBE by EPA <br /> Method 8260 Modified, <br /> • Total lead by EPA Method 6010/200 7, <br /> I • Nitrate as NO, by EPA Method 353 3 (effluent samples only), and <br /> • Aquatic toxicity (Bioassay) by EPA Method EPA 60014-90/027F (quarterly sampling <br /> frequency, effluent samples only) <br /> T <br /> lie Receiving water samples(Coldaru ditch) were logged on a chain of custody form,placed in a chilled <br /> container and transported to a DHS-certified laboratory for analysis for <br /> a Total dissolved solids by EPA Method 160 1 (quarterly sampling frequency), and <br /> Turbidity by EPA Method 180 1 <br /> 2 4 INFLUENT MONITORING <br />' In accordance with monthly requirements ofRWQCB Monitoring and Reporting Program No 5-00- <br /> 119, ground water pump and treat influent monitoring was performed for TPH-g, TPH-d, TPH-mo, <br /> BTEX, MTBE, methanol, ethanol, DIPE, TAME, ETBE, TBA and total lead on 03 January, 02 <br /> February and 08 March 2001 <br /> Influent water samples collected on 03 January and 02 February 2001 detected MTBE (utilizing <br /> EPA Method 8260) at concentrations of 240 and 150 ,ug/l, respectively, on 08 March 2001, the <br /> influent water samples collected from extraction wells EW-2, EW-4, EW-5, EW-6, EW-7, EW-8, <br /> EW-9 and EW-10 were detected at concentrations between 20 and 540 �zg/l with an average of 164 <br /> ,ug/l The laboratory analysis did not detect any other constituents of concern Analytical results of <br /> pump and treat influent-water samples are summarized in Tables 1 and 6, laboratory reports are in <br /> Appendix D <br /> Advanced GeoEnvironmental,Inc <br />