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geologceae rechlaa Inc Page 6 ' Groundwater Monitoring Report Project No 425 2 April 27,2006 ' stabilized (Appendix C) indicating that water representative of actual aquifer conditions was entering the well Groundwater parameter stabilization was characterized by three successive ' readings within 10% Before a sample is collected, standard operating procedure requires that the well's water level be allowed to recharge to at least 80% of its initial level Del-Tech noted the following variances in sampling protocol MW--2 Strong fuel odor, heavy sheen • MW-3 Poor recharge, grab sample collected on 3rd volume ' • MW-5 Poor recharge, grab sample collected on 1St volume (68% recharge) • MW-7 Poor recharge, grab sample collected on 3rd volume (72% recharge) ' 0 MW-8 Poor recharge, grab sample collected on I"volume (65% recharge) • MW-106 Poor recharge, grab sample collected on 3rd volume (44% recharge) • MW-107 Sample collected early(58% recharge) ' A Waterra® pump with dedicated tubing was used to collect each sample, unless indicated as a grab sample above Extreme care was exercised while collecting samples to prevent ' agitation of the water contained in the dedicated tubing or bailer Water samples were transferred from the dedicated tubing or bailer into 40-m1 VOA vials preserved with hydrochloric acid Care was taken to minimize sample aeration during transfer of the sample All samples were checked for headspace bubbles, labeled, inserted into foam holders and placed into a cooled ice chest for transport to the laboratory ' The sampling technician wore disposable gloves while collecting all samples ' All the water removed from the monitoring wells and not used as a sample was placed in a properly labeled 55 gallon DOT (Department of Transportation 17-H) approved container and temporarily stored on-site A chain of custody document, listing all samples collected and their intended analyses, accompanied the samples from field to the laboratory, thereby providing a means to track the ' movement and insure the integrity of the samples 2.2 Laboratory Analysis—Monitoring Wells ' The groundwater samples collected on January 22, 2006 were delivered to Excelchem Environmental Labs (California Certification # 2119), of Roseville, California, for analysis ' The samples were analyzed using the following methods BTEX—EPA method 8260B ' • TPH-Gasoline— EPA method 8260B • Fuel Oxygenates (MtBE, DIPE, ETBE, TAME and TBA) by EPA method 8260B 0 Lead Scavengers (1,2-DCA and EDB) by EPA method 8260B