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1 <br />' 23 November 1998 <br /> AGE-NC Project No 95-0103 <br /> Page 2 of 7 <br /> ' The purge pump was washed in an Alconox solution and rinsed with tap water prior to purging each <br /> well Purged water was stored in 55-gallon drums on the site Field measurements of the ground <br /> water purging parameters are included in Appendix A <br /> 1 <br /> 2 3 GROUND WATER SAMPLE COLLECTION <br /> ' Water samples were retrieved from each purged well using new disposable bailers The samples <br /> ' were transferred lento 40-m1 EPA-approved VOA vials containing 0 5 ml hydrochloric acid (18%) <br /> as a sample preservative and were transported in a chilled container under chain-of-custody to <br /> McCampbell Analytical,Inc (MAI)a state-certified laboratory in Pacheco, California for laboratory <br /> ' analyses Samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> ' Method 8015m, <br /> • Volatile aromatic compounds(benzene,toluene,ethyl-benzene and total xylenes BTEX)and <br /> methyl-tert-butyl ether(MTBE)in accordance with EPA Method 8020 and <br /> • Oxygenating fuel additives tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), methyl- <br /> tert-butyl ether (MTBE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether <br /> (TAME) in accordance with EPA Method 8260m <br /> 24 SPARGING/EXTRACTION SYSTEM OPERATION AND MONITORING <br /> ' The IAS system operated continually during the quarter The sparging flow rate was adjusted to <br /> approximately 10 scfm or to a minimum pressure of 15 psi During each monitoring event,the depth <br /> to ground water and percent dissolved oxygen were measured in each monitoring well (Table 3) <br /> ' General system maintenance and adjustments were performed during the quarter <br /> The flow rate of extracted vapor was measured using a Dwyer differential pressure flow meter <br /> ' Organic vapor concentrations in the extracted soil-vapor stream were measured before entering the <br /> blower using an organic vapor meter (OVA) equipped with a photo-ionization detector (PTD <br /> ' Thermo Environmental 580A, 10.OeV, calibrated to isobutylene) <br /> Soil-vapor samples were collected on 22 July, 31 August and 01 October 1998 The vapor sample <br /> ' was collected in a Tedlar bag from the influent stream The sample was collected with a vacuum <br /> pump The sample was labeled, placed iii a cool ice chest and transported under chairs-of-custody <br /> to MAI Samples were analyzed for <br /> Advanced GeoEnvnronmenial,Inc <br /> 1 <br />